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Novel 6‐GHz/80.8% fractional bandwidth filtering power divider with ultra‐large coupling coefficient using air‐dielectric broadside‐coupled lines Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-17 Qunliang Wang, Yanfeng Jiang, Shaomin Li
In the letter, a wideband filtering power divider (FPD) with ultra‐large coupling coefficient using air‐dielectric broadside‐coupled lines is proposed. The broadside‐coupled line and single transmission line are alternately connected to construct three resonators, which can be used for large bandwidth and high selectivity filtering. An improved substrate‐integrated suspended line (SISL) structure with
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High gain D‐band hybrid integrated on‐chip antenna based on low‐cost printed circuit board packaging technology Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-17 Yanjun Wang, Xiang Yi, Wenquan Che, Quan Xue
A high gain D‐band hybrid integrated on‐chip antenna (OCA) based on a low‐cost printed circuit board (PCB) packaging technology is analyzed and designed in a standard 40‐nm CMOS process in this paper. The proposed OCA is a hybrid structure of a slotted patch OCA with off‐chip PCB ground and off‐chip dielectric resonator (DR). The proposed OCA exhibits a simulated gain of 3.5 dBi and 53% radiation efficiency
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X‐Band 130‐nm CMOS transceiver front‐end with a broadband attenuator design for phased‐array systems Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-17 Dongwei Pang, Shiwei Wu, Yan Wang, Yongfeng Gui, Zongming Duan, Gang Wang
This letter demonstrates an X‐band transceiver front‐end in 130‐nm CMOS technology for phased‐array systems. To solve the problem that passive attenuator performance deteriorates significantly in wideband systems, a 6‐bit attenuator with source follower and common‐gate amplifier is proposed. Besides, an 8‐bit vector‐summing phase shifter is implemented in common path to realize the phase coverage of
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Resistive‐reactive class‐X power amplifier with bandwidth beyond one octave Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-16 Junze Ye, Xin Guo, Wen Wu
This article presents a resistive‐reactive Class‐X power amplifier (PA) with bandwidth beyond one octave. By introducing resistive component into the second‐harmonic load of Class‐X power amplifier, the impedance design space is expanded. The basic theory of extended Class‐X PA is deduced, including impedance calculation, high‐efficiency design consideration and targeted impedance trace design. An
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A 56‐GBaud lumped linear push–pull driver for Mach–Zehnder modulator in 130‐nm SiGe technology Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-16 Wentian Fan, Yingmei Chen, Jun Yan, En Zhu
A fully differential lumped linear driver for Mach–Zehnder modulator has been presented and assessed in 130‐nm SiGe BiCMOS technology. Multitopology peaking techniques, especially T‐coil peaking method, have been employed to flatten the frequency response and increase the bandwidth. Degeneration resistors have been used to enhance circuit linearity. Simultaneously, improvements have been made to the
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A heteropolarized single layer reflect‐transmit‐array antenna Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-16 Liang Yajie, Y. U. Ying
A novel reflect‐transmit‐array antenna is proposed in this paper, in which a single‐layer heteropolarized element with a thickness of 0.1 at 11 GHz, consisting of only two layers of metal patches printed on a dielectric substrate and six metal vias, can integrate reflection and transmission modes in the same frequency band by reasonably distributing the positions of the reflection and transmission
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Compact filtering power divider for mm‐wave applications using integrated passive device technology Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-15 Donghyuk Seo, Sunghun Jung, Young‐Joon Kim
We present a compact, filtering power divider (FPD) using integrated passive device technology (IPD) for mm‐wave applications. Our proposed FPD design integrates quarter‐wavelength coupled‐resonator bandpass filters with a Wilkinson power divider, using size reduction techniques. Coupled coplanar waveguides provide excellent coupling while occupying a small area, and metal‐insulator‐metal capacitors
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A reconfigurable band‐notched wearable super ultra‐wideband antenna utilizing a split‐ring resonator Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-15 Leila Ghanbari, Asghar Keshtkar, Saughar Jarchi
This article presents a flexible ultra‐wideband (UWB) antenna that can be used in wireless body area networks (WBAN). The antenna has a switchable slotted split ring resonator (SRR) structure on the radiating patch, which creates band‐notch functionality. The antenna has three switchable states: UWB and two band‐notched states at central frequencies of 5.5 and 3.5 GHz. The antenna has compact dimensions
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Wideband dual‐polarized rasorber design with genetic algorithm synthesis Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-15 Akın Özkan, Birsen Saka
In this letter, an 11 GHz centered wideband absorptive frequency selective surface (FSS) design is presented. The absorptive FSS is dual polarized, and it has wide transmission band and a wide absorption band at the lower frequency side of the transmission band. An octagon shape with parallel microstrips toward center connected with lumped element resistors at the edges is proposed for the resistive
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Synergizing meander line and heterogeneous composite for miniaturized hybrid microwave absorber Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-15 Nikunj Goyal, Ravi Panwar
This study presents a significant stride in microwave absorption technology through the integration of a meander line (MDL) pattern with a heterogeneous composite (HC) fused perforated microwave absorber (PFMA). Through a comprehensive analysis, it is demonstrated that the integration of these approaches leads to improved performance compared to traditional absorber configurations. The conversion of
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Normalized frequency for noncircular dielectric waveguides Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-13 Chin Hui Teh, Deepak Kumar, Siva Priya Thiagarajah
This paper points out that the commonly used normalized frequency for noncircular dielectric waveguides, which is based on the semiminor axis, causes the cross‐sectional area to vary with the cross‐sectional shape. Consequently, the shape effects described with the conventional normalized frequency are not due to the shape alone but the combined effects of the shape and area. Our numerical results
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A 315–345 GHz quad‐port balanced tripler with inherent suppressions on even‐order harmonics using discrete Schottky diodes Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-13 Ruoxue Li, Hao Yang, Ren Zhou, Yue He, Kun Huang, Jun Jiang, Yaoling Tian
A high‐efficiency frequency tripler operating up to 330 GHz is developed based on a novel quad‐port balanced configuration. The proposed circuit could inhibit the even‐order harmonics with great idler loops, leaving out the lossy capacitors required in conventional triplers. Meanwhile, this topology employs two pairs of discrete Schottky diodes, which could increase the power‐handling capability by
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A scalar–tensor impedance metasurface for frequency‐multiplexed multifunctional orbital angular momentum beams generation Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-13 Huifen Huang, Yingjing Ma
A scalar‐tensor composite holographic impedance meta surface (HIMS) for frequency‐multiplexed is proposed. The scalar and tensor parts operate at low frequency and high frequency, respectively, the coupling between them can be over come, and then more multifunction orbital angular momentum (OAM) beams with good performance can be obtained. As an example, a scalar‐tensor HIMS is designed for three OAM
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Single/bidirectional pattern and beamwidth reconfigurable array antenna using reconfigurable reflecting surface Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-08 Tarun Prakash, Raghvendra Kumar Chaudhary, Ravi Kumar Gangwar
This study describes an array antenna that allows for reconfiguration of the three significant antenna properties, that is, radiation pattern, half‐power beamwidth (HPBW), and single and bi‐directional beam. A reconfigurable reflecting surface (RRS) has been designed and incorporated with the array antenna on the top and bottom. The RRS works to reflect or pass the incident electromagnetic wave. It
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Design of dual‐band FPD with high selectivity based on QMRLR Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-06 Tian T. Zhang, Lei Chen, Meng Liu, Feng Wei
In this brief, a filtering power divider (FPD) with independently controllable four transmission zeros (TZs) and low insertion loss is designed and analyzed by using quad‐mode ring‐loaded resonator (QMRLR). The equivalent circuit of the proposed FPD is given, and the resonant characteristics of the resonator are analyzed. Due to the horizontal transmission interference of QMRLR, two TZs are realized
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Mode reconfigurable OAM helical array antenna for higher mode generation Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-04 Yunqi Zhang, Rui Yang, Xuping Li, Jiateng Chen, Peng Hu, Xuanming Zhang, Shanzhe Wang
In this paper, an orbital angular momentum (OAM) mode reconfigurable antenna based on a uniform circular array (UCA) is presented. The phase superposition method is presented to overcome the limitation of the number of array units on the mode order in the conventional four‐element UCA antenna, which is limited to generating first‐order OAM beams. The unit phase is introduced by a bifilar helical antenna
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THz active modulation device by electric field turned modulation characteristics of titanium sulfide nanofilm device Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-04 Feilong Gao, Shaodong Hou, Guoru Li, Bingyuan Zhang
An effective approach to manipulate terahertz (THz) waves involves the utilization of a device structure. In this particular investigation, we have successfully fabricated a SnS2 nanofilm device using femtosecond laser direct ablation. The passive and active polarization‐sensitive characteristics of the SnS2 nanofilm device were examined within the THz frequency range, employing different line spaces
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Design of miniaturized 2.5D frequency selective surface for X‐ and Ku‐band applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-04 Anandan Suganya, Rajesh Natarajan
This paper presents the design of 2.5D frequency selective surface (FSS) for X and Ku band applications. Proposed FSS's unit cell is constructed with two independent slitted rings on both side of the FR4 substrate and is connected with metallic vias. The FSS offers a wide stop band performance from 6.26 to 18 GHz, with a fractional bandwidth of 96.7% measured at S21 < −10 dB and has a low insertion
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A novel 3D metal printing in‐line bandpass filter with multiple controllable transmission zeros Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-03 Sheng Zhang, Da Ni Li, Jia Yu Rao, Xin Xie, Jun Wei He, Khaled Aliqab
In this paper, a novel three‐pole bandpass filter with a pair of controllable transmission zeros (TZs) is proposed first. The proposed structure is based on asymmetric dual‐postresonators and two external resonators. The fundamental mode and the first higher mode of the asymmetric dual‐postresonators are used as the nonresonant mode and the resonant mode separately. The nonresonant mode generates direct
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Miniaturized IPD bandpass filter with controllable transmission zero based on modified lumped T‐section Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-03 Yanzhu Qi, Yazi Cao, Bo Yuan, Shichang Chen, Gaofeng Wang
In this letter, a miniaturized bandpass filter (BPF) with controllable transmission zero (TZ) based on one lumped T‐section is proposed. To enhance rejection in the BPF, a modified T‐section circuit is introduced to generate a controllable TZ that can be readily adjusted by the LC values. To validate the performance, the proposed BPF is fabricated using integrated passive device technology on silicon
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Theoretical and experimental investigation of on‐chip silicon‐on‐insulator waveguide methane sensor Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-03 Zhenheng Xu, Bing Tian, Xiaopeng Fan, Jie Wei, Zejie Tan, Qiancheng Lv, Chuantao Zheng
Compared to discrete gas sensors, on‐chip waveguide gas sensors show a wide range of application scenarios due to their small size, light weight, and low power consumption. An on‐chip silicon‐on‐insulator waveguide methane (CH4) sensor was proposed. The optimal waveguide length was determined to be 2.2 cm through theoretical analysis. By targeting an absorption line located at 3291 nm, on‐chip methane
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A dual‐wideband 5G antenna with dual polarization in the sub‐6 GHz band and 2 × 2 MIMO function in the 28‐GHz band Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-02 Weikang Gui, Huayan Jin, Wenlei Wang, Kuo‐Sheng Chin, Guo Qing Luo
A novel aperture‐shared dual‐wideband 5G antenna with dual polarization in the sub‐6 GHz band and multi‐input multi‐output (MIMO) function in the 28‐GHz band is presented in this work. A dual‐polarized megnetoelectric dipole (ME‐dipole) with wide bandwidth is introduced in the sub‐6 GHz band. Based on the partial structure reuse method, four 2 × 2 substrate integrated waveguide (SIW) cavity‐backed
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A wide angle phase‐frequency scanning linear array composed of leaky‐wave antenna Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-02 Junqing Xu, Yulong Xia, Qi Zhu
Here, a wide‐angle phase‐frequency scanning linear array composed of leaky‐wave antennas (LWAs) is proposed. The unit cell of the proposed LWA element consists of microstrip lines and grounded vias. By increasing the scanning rate based on theoretical analysis, wide scanning range with low gain fluctuation of the LWA element is achieved. For gain enhancement, the LWAs are arranged along their length
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Ppb‐level CO2 sensor based on a miniature multipass cell with eight‐petaled spot pattern Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-04-01 Chenglong Wang, Leqing Lin, Xiangyu Zeng, Jiabao Xie, Huijian Luo, Haoyang Lin, Lihao Wang, Jieyuan Tang, Ruyue Cui, Wenguo Zhu, Yongchun Zhong, Jianhui Yu, Lei Dong, Hongpeng Wu, Huadan Zheng
This paper presents an innovative carbon dioxide sensor leveraging a dense‐pattern multipass absorption cell. This novel design dramatically compacts an extensive optical path of approximately 11.4 m into a 70 mm inter‐mirror distance, effectively enhancing the system's sensitivity and reducing its size. Utilizing a 2004 nm diode laser, the sensor accurately targets a potent CO2 absorption line at
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Low‐sidelobe orbital angular momentum beam for donut‐shaped amplitude‐and‐phase metasurface based on Bayliss synthesis method Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-26 Jing Wang, Haibing Ding, Yang Cai, Wenke Song, Sen Li, Yuanzhe Luo, Qianzhong Xue
In this letter, a method for generating low‐sidelobe orbital angular momentum (OAM) beam is presented using a donut‐shaped amplitude and phase metasurface (DS‐APM). Building upon conventional phase‐only metasurface, the Bayliss synthesis method is employed to adjust the amplitude distribution on the metasurface. Thereby, the amplitude and phase metasurface (APM) can reduce the sidelobe level of the
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High efficiency GaN power amplifier with compact harmonic tuning network Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-22 Qi Cai, Zicheng Gao, Quan Xue, Wenquan Che
One high efficiency second harmonic tuned (2HT) power amplifier (PA) with a compact multi‐harmonic tuning network is presented. The proposed design method can drive the third harmonic impedance to short‐circuit condition to achieve an ideal 2HT PA operation. Then the second harmonic impedance is controlled to proper position to improve the PA efficiency. Meanwhile, the fundamental impedance is also
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Design of multibeam antenna with ultralow cross‐polarization Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-21 Xiao Tao, Hao Wang, Jixiang Wan, Wei Ding, Wenchao Song, Heng Deng
This paper presents a design to realize extremely low cross‐polarization level in multibeam antenna. The antenna consists of two reflectors placed on top of each other. The front reflector is a panel made of metal grid, which is used to separate two orthogonal polarizations. The rear reflector serves as the actual multibeam antenna surface. The multibeam antenna and feed array operated at Ku band are
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Environmentally stable all‐fiber femtosecond laser for industrial application based on a SESAM mode‐locked ytterbium‐doped laser Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-21 Xue Cao, Feng Li, Dongdong Song, Yishan Wang, Qianglong Li, Hualong Zhao, Wei Zhao, Wenlong Wen, Jinhai Si
We demonstrate an environmentally stable femtosecond laser for industrial application based on all polarization‐maintaining Yb‐doped laser and experimentally explore the effect of the net cavity dispersion (NCD) on output characteristics. The oscillator emits pulses with 5.1 ps and a 23 nm spectral bandwidth, then the pulse is compressed to 88 fs. The instabilities over 120 h gives 0.32% relative root
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Research on etalon‐free CO2 measurement based on direct absorption signal fitting Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-21 Yan Yang, Songjie Guo, Jiatong Li, Youxing Wei, Zhimin Lu, Xiwen Xing, Wei Ren, Xiang Zhang, Shunchun Yao
The emission of carbon dioxide (CO2) by thermal power plants is the main factor leading to the greenhouse effect. The measurement of CO2 is of great significance to carbon emission data statistics. In this paper, a measurement system based on tunable diode laser absorption spectroscopy (TDLAS) was built to measure the spectrum of CO2 near 1579 nm. To simplify the experimental system, a direct absorption
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Coupling strength comparison in optical fiber with multiple sector shape stress elements Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-20 Jiamin Gao, Xingyi Su, Minning Ji
The maximum stress oscillation amplitude and maximum coupling strength of the optical fiber with multiple sector stress elements are studied. Optimized fiber structure with craft feasible is designed and the related structural parameters are given. Comparing the research results, it is found that the optical fiber with triple sector stress elements can achieve the strongest coupling strength to realize
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Deep‐subwavelength characteristics of focused vector double‐petal linear edge dislocation beams Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-19 Yu Su, Chen Yang, Xiaojin Yin, Shanlong Guo, Pengbo Shi, Jinhong Li
Recently, vector beams with special intensity and phase distribution have received much attention due to their unique properties. In this paper, we construct the double‐petal linear edge dislocation (DPLED) beams based on Gaussian vortex beams. The distribution of intensity, polarization, and spin angular momentum (SAM) of the DPLED beams is analyzed in tightly focused based on the Richards‐Wolf vector
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Wideband circularly polarized antenna loaded with π‐shaped dipole for millimeter‐wave applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-14 Yikai Zheng, Ke Han, Zhuoxi Jiang, Ze Yan
This paper presents a novel wideband circularly polarized antenna that is fed by substrate‐integrated waveguide. Based on the design of placing a pair of chamfered semicircular patches above a slot, a ‐shaped radiator is introduced between the semicircular patches. Multiple resonance points are generated by the combination of the entire radiating structure and a dumbbell‐shaped slot, resulting in improved
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Accurate determination of sorghum origin based on hyperspectral imaging technology and machine learning Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-14 Guangxia Zhao, Qi Wang, Pengfei Zhang, Zhuopin Xu, Liwen Tang, Xiaohong Li
Sorghum is an important crop, and the quality of sorghum of the same variety from different geographic origins varies greatly. This study focuses on HongYingZi sorghum from five distinct origins, employing a combination of hyperspectral imaging (HSI) technology and machine learning algorithms to investigate methods for classifying sorghum origin. Multiplicative scatter correction and the Savizkg‐Golay
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A spaceborne broadband circularly polarized conformal antenna for UHF band applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-14 Xiaotian Wang, Min Liu, Fan Lu
A Spaceborne broadband circularly polarized conformal antenna for ultra high frequency band is presented. The antenna mounted on the outer surface of the circular arc spherical cone satellite works in 390–450 MHz frequency band, and has the characteristics of broadband, light miniature. The measured results for the antenna demonstrate an impedance bandwidth of 32.5% from 360 to 500 MHz, an axial ratio
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Meta‐atom design and communication prototype for wideband reconfigurable intelligent surface Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-13 Yuan Liu, Hongtao Zhang, Li Deng
Existing research on reconfigurable intelligent surfaces (RIS) has mainly focused on narrowband applications due to limitations in programmable metasurfaces and field prototype realization. This letter introduces a wideband RIS meta‐atom consisting of a single‐layer frequency selective surface supported by a dogbone‐shaped patch, ensuring a stable linear phase interval around the resonant frequency
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An arrayable low‐profile antenna with a broad bandwidth Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-13 RongLin Li, Wang Li, Song Lin, Yuehui Cui
An arrayable dual‐polarized antenna is proposed in this paper, which exhibits a low profile and broad bandwidth. A metasurface and a square ring are introduced to realize the broadband operation of the low‐profile dual‐polarized antenna. The total size of the broadband antenna is (where is the wavelength at the lowest frequency of the operation band [1.31 GHz] in free space), suitable for use as an
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Advancing CO2 to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-13 Luping Wang, Lunhua Deng, Qian Huang, Xuanbing Qiu, Chuanliang Li, Sanjun Zhang
Capturing carbon dioxide (CO2) and transforming it into valuable fuels offers a dual benefit: the potential to reduce atmospheric CO2 levels and decrease our dependency on fossil fuels. Plasma‐assisted CO2 to carbon monoxide (CO) conversion stands out within the various CO2 recycling methods, with research primarily emphasizing its energy efficiency and conversion efficacy. However, investigations
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Erratum to “Wideband miniaturized circularly polarized magnetoelectric dipole antenna array for millimeter‐wave applications” Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-12
Meng W, Sun Y, Li Y, Xu J. Wideband miniaturized circularly polarized magnetoelectric dipole antenna array for millimeter-wave applications. Microw Opt Technol Lett. 2024;66:e34086. doi:10.1002/mop.34086 (1) FIGURE 1 Geometry of the proposed CP ME-dipole antenna (A) 3-D model. was incorrect. The corrected figure is provided here: FIGURE 1 Geometry of the proposed CP ME-dipole antenna (A) 3-D model
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Graphene‐based transparent and tunable plus‐shaped refractive index sensor for detecting waterborne bacteria Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-12 Shobhit K. Patel, Yagnesh Parmar, Osamah Alsalman, Juveriya Parmar
Waterborne bacteria cause many dangerous diseases as well as several health‐related issues hence detection of them is a global challenge today. A plus‐shaped graphene sensor to detect waterborne bacteria is presented in this paper. The detection mechanism is based upon the refractive index difference between waterborne bacteria sample and pure water which causes a change in resonance peak in the transmittance
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Design of compact balanced filters with wide DM upper stopband and CM rejection band based on semi‐circular patch Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-11 Xuedao Wang, Zai‐Cheng Guo, Feng Huang, Jianpeng Wang, Lingling Wang
A new design approach to achieve compact size and high common‐mode (CM) suppression of balanced filters is proposed with two back‐to‐back microstrip semi‐circular patch resonators. In feeding structures, metalized via holes are adopted to vertically feed patches by differential pairs. Then, TM11 mode is excited and TM31 mode can be rejected, resulting in wideband differential‐mode (DM) harmonic rejection
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Electrically tunable substrate integrated waveguide equalizer based on PIN diodes Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-09 Hao Peng, Chen Zhang, Yu Liu, Serioja Ovidiu Tatu, Tao Yang
In this letter, a novel design of electrically tunable substrate integrated waveguide (SIW) equalizer, based on PIN diodes, is proposed. Compared to previous SIW equalizers, this one introduces PIN diodes that exhibit varying impedance under different direct current (DC) voltages. The equalizing values of the SIW equalizer are directly linked to the DC voltage applied to the PIN diode within a specific
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A broadband transparent antenna applied in indoor mobile communication system Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-09 Zibin Weng, Jia Liu, Youqian Su, Xiaoming Wang, Bo Yan
This paper proposes a broadband optical transparent antenna using a transparent conductor film on a transparent polyethylene terephthalate (PET) substrate. The planar wide‐slot antenna coupling fed by microstrip has a wide impedance bandwidth, so it is selected to design the transparent antenna. The upper surface of the PET substrate is a microstrip line with a fork‐shaped tuning branch, and the lower
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Self‐equalized linear‐phase microstrip bandpass filter based on negative group delay parallel‐coupled three‐line units Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-09 Awei Zhang, Jinping Xu, Liu Zhiqiang
A self‐equalized linear‐phase microstrip bandpass filter (BPF) utilizing negative group delay (NGD) parallel‐coupled three‐line (PCTL) units is presented in this letter. The NGD PCTL unit possesses an NGD valley in its frequency response of group delay (GD). By a combination of two or more NGD valleys, the sharp positive GD peaks at passband edges of a conventional coupled‐line BPF are counterbalanced
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Design and numerical modeling of chalcogenide parabolic‐core waveguide for on‐chip supercontinuum generation extending from near‐IR region to mid‐IR region Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-07 Drishti Singh Tomer, Ajeet Kumar
We present the design and computational examination of a waveguide structure with a parabolic core, implemented in AsSe2 chalcogenide glass. This structure aims to generate a mid‐infrared (mid‐IR) supercontinuum (SC) spectrum, covering the wavelength range of 1.4−7.6 µm. It includes molecular fingerprint region as well as earth's atmospheric transparent window. A pulsed laser providing pulses of peak
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A new X‐band frequency up‐converter design for LEO satellite ground station utilizing a single superheterodyne Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-06 İsmail Şişman, Tugba Haykir Ergin, Duygun Erol Barkana
In this work, the advancing wireless revolution (AWR) modeling and Microwave Office tools are used to develop and execute a broadband up‐converter system. Before sending the input frequency to the antenna interface, a radio frequency block upconverts it once to the appropriate frequency level. Mixing blocks, oscillators, amplifiers, step attenuators, isolators, and filters are included. The input frequency
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A compact polarization independent stop band frequency‐selective surface for WLAN shielding Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-05 Rajesh Natarajan, Ramprabhu Sivasamy, Aarthi Gunasekar
This paper presents the design and prototype development of a compact frequency‐selective surface (FSS) for shielding WLAN signals. The FSS unit‐cell geometry is evolved by modifying the arms of the conventional crossed dipole element. The footprint of the unit cell is only 6 mm × 6 mm × 1.6 mm. The proposed FSS offers stop band characteristics at 5 GHz for both transverse electric (TE) and transverse
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Adjustable anomalous hollow vortex beam and its properties Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Xu Guo, Yansong Song, Keyan Dong, Lei Zhang
A new beam named adjustable anomalous hollow vortex beam (AAHVB) is proposed, and the expressions of an AAHVB in uniaxial crystal are derived. The evolutions of intensity distributions of an AAHVB in free space and uniaxial crystal are investigated. The relationships between intensity distributions with beam parameters, uniaxial crystal, and distance are analyzed in detail. It is found that intensity
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A 1.33–1.88 GHz microfluidically tunable filter with controllable coupling Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Weihang Huang, Hongji Li, Jieen Xie, Ruisen Chen, Jing‐Yu Lin, Sai‐Wai Wong
In this article, a continuously microfluidically tunable filter using two microstrip resonators is proposed. By injecting different amount of water into the tubes, the resonant frequency as well as coupling intensity between two resonators can be controlled. As a result, the fractional bandwidth (FBW) of the proposed band can keep constant when tuning the frequency. As far as the authors know, most
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A programmable solar‐powered radio frequency transmitter Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Qian Chen, Zilin Qiao, Juliang Lv, Yong Ye, Xingang Ren, Wei Wang, Zhixiang Huang, Lixia Yang, Yingsong Li
This paper proposes a programmable solar‐powered radio frequency (RF) transmitter. It employs a novel five‐layer structure that effectively integrates solar cells, active circuits, and broadband antenna. This design can directly emit RF signals without the need for additional power supply, enabling efficient energy conversion and transmission. In addition, a U‐shaped coupling line model is introduced
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2–26.5 GHz GaN ultra‐wideband amplifier with over 2 W output power Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Wei Dai, Bowen Tang, Junting Lu, Xiaodong Feng, Yuehang Xu
A 2–26.5GHz broadband amplifier monolithic microwave integrated circuit (MMIC) based on the 0.15 μm GaN high electron mobility transistor process has been developed. The broadband amplifier adopts a two‐stage distributed amplifier cascade structure, which improves the gain of the broadband amplifier. Further, the capacitive coupling is used to improve the gain bandwidth product of the power amplifier
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Real‐time demonstration of photonics‐based THz wireless fronthaul integrated with fiber‐optic mobile fronthaul Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-01 Sang‐Rok Moon, Sooyeon Kim, Eon‐Sang Kim, Minkyu Sung, Seung‐Hyun Cho
A photonics‐based terahertz (THz) wireless fronthaul is proposed, and its feasibility is investigated by real‐time demonstration. The proposed wireless fronthaul can be simply integrated into existing fiber‐optic fronthaul, to serve as a complementary or emergency network. An optical signal can be converted into a THz wireless signal by photonics‐based THz‐signal generation technology, utilizing a
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A low‐cost and multifunctional long‐life anthropomorphic head phantom for microwave brain imaging systems Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-01 Mahdi Salimitorkamani, Mehdi Mehranpour, Gokhan Cansiz, Sulayman Joof, Mehmet N. Akinci, Ibrahim Akduman, Hayrettin Odabasi
To assess the performance of microwave brain imaging (MWBI) systems, an anthropomorphic multifunctional head phantom with long life, low cost, and reliable dielectric properties over the intended frequency range is a principal requisite. A solid head model has been developed using a mold casting method, incorporating graphite, aluminum oxide, carbon black powder, and brass powder with epoxy/hardener
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Design and analysis of a freeform surface lens coupler applied in hollow‐core photonic crystal fiber resonant optic gyros Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-01 Wen Fan, Ran Bi, Heliang Shen, Xuan She, Kan Chen, Xingfan Chen, Xiaowu Shu
In this study, a novel freeform surface lens coupler is designed to realize the coupling functions in the hollow‐core photonic crystal fiber (HCPCF) resonator optical gyroscope. One surface of the lens is an ellipsoid. Coupling of the two HCPCF loop's ports can be directly accomplished via reflection on the ellipsoid surface. The other surface of the lens is the Biconic Zernike surface. Transmitting
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An improved gain and directivity design of an antipodal Vivaldi antenna for ultra‐wideband detection Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Jingjing Wang, Yongcheng Li, Jianwei Liu, Yucheng Fan, Kangming Hou, Huaqiang Xu
A novel antipodal Vivaldi antenna (AVA) is proposed to achieve improved gain and directivity. To enhance the bandwidth of the antenna, a series of equal‐sized slots are etched onto the patch surface. Additionally, a dielectric lens with a fan‐shaped structure is integrated along the patch openings to boost gain. The length of the lens which will affect the radiation characteristics of the antenna in
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Wideband filtering power dividers with/without notch band Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Ali Kursad Gorur, Engin Dogan, Ceyhun Karpuz, Adnan Gorur
Low loss and compact wideband filtering power dividers (WB‐FPDs) with/without notch band are proposed. The WB‐FPDs are designed using wideband bandpass filter based on asymmetric stepped‐impedance resonator (SIR). Parallel coupled microstrip lines are used to create both wideband filtering characteristic and two additional transmission poles. A notch band can be generated at upper passband edge by
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Liquid‐level sensor based on Michelson interferometer with double hook structure Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Beibei Mao, Yongfeng Wu, Weihao Cheng, Rahat Ullah, Jianxin Ren, Yaya Mao, Tingxuan Yuan, Tutao Wang
A new type of Michelson interferometer (MI) based on a double hook structure is proposed for measurement of liquid level and temperature. The optical fiber MI based on the double‐hook structure is fabricated using a hydroxide flame heating device. Furthermore, the angle and sensing length of the double‐hook structure can be controlled by a rotating platform. The sensor is fixed on a ruler, which is
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Hexagonal ring‐inspired antenna for UWB and V2X applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Rahul K. Garg, Suvadeep Choudhury, Raghuvir S. Tomar
This paper presents a small‐sized, planar antenna fabrication for ultra‐wideband (UWB) and vehicle‐to‐everything (V2X) applications. The design is inspired by a hexagonal ring, providing an UWB bandwidth of 16.61 GHz (from 3.33 to 19.94 GHz) and a fractional bandwidth of 142.75%. A suitably placed inverted‐U slot in the feed line helps in achieving the WLAN notch band (from 5.04 to 6.01 GHz). The overall
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A dual‐band dual‐polarized omnidirectional patch antenna for on‐body application Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-28 Guo‐Ping Gao, Dan Wang, Ge Ma, Shi‐Chen Wang, Zhi‐Heng Dou, Bin Hu
Aiming at the 3.5 GHz world interoperability for microwave access band and 5.8 GHz industrial scientific medical band, a dual‐band antenna operating in omnidirectional mode is proposed. The antenna uses a single‐layer dielectric substrate made of FR‐4, which is cheap and easy to process. It uses circular patches and metal branches to generate orthogonal electric fields to achieve circular polarization
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Optimization of passive Q‐switched fiber laser employing MAX phase chromium aluminum carbide film Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-27 Mustafa Mohammed Najm, Pei Zhang, Aya A. Almukhtar, Jassim K. Hmood, Mohammed Najm Abdullah, Sulaiman Wadi Harun
In this work, we proposed a mechanical exfoliation technique to compose a saturable absorber (SA) from MAX phase chromium aluminum carbide (Cr2AlC). The performance of a passive Q‐switched erbium‐doped fiber laser (EDFL) based on Cr2AlC‐SA was experimentally demonstrated. The optical properties of SA showed appropriate nonlinear absorption, with a non‐saturable absorption of 92.5%, and saturable absorption