ABSTRACT

This paper presents a new compact monopulse comparator network system (MCNS) using a modal substrate-integrated waveguide (SIW) hybrid coupler for the first time. The main objective of this research is to evaluate the performance of dual-plane MCNS based on return loss and coupling coefficients. A detailed analysis, design, and implementation of dual-plane MCNS is performed using the four modal SIW hybrid couplers. The sum and difference signals required by the monopulse antenna are generated with the proper orientation of couplers. The in-phase and out-phase characteristics of the couplers are generated using TE₁₀₂ and TE₂₀₁ orthogonal degenerate modes. A complete planar and compact SIW structure has a footprint of 58.2 mm × 58.2 mm. MCNS is fabricated on a single-layer Rogers RO4003 substrate with a permittivity of 3.55 and thickness of 0.787 mm using a photo-lithographic process. MCNS provides excellent return loss characteristics at all input and output ports. It measured the isolation better than 20 dB for all output ports in the desired frequency band. It achieved good coupling between all input and output ports. Simulation and measured results show that at 10 GHz, MCNS gives better performance parameters and can be used in monopulse antenna.

摘要

本文首次提出了一种使用模态基板集成波导（SIW）混合耦合器的新型紧凑型单脉冲比较器网络系统（MCNS）。本研究的主要目的是根据回波损耗和耦合系数评估双平面 MCNS 的性能。使用四模态 SIW 混合耦合器对双平面 MCNS 进行了详细分析、设计和实现。单脉冲天线所需的和信号和差信号是通过耦合器的正确方向生成的。_{使用 TE 102}和 TE ₂₀₁生成耦合器的同相和异相特性正交简并模式。完整的平面紧凑 SIW 结构的占地面积为 58.2 mm × 58.2 mm。MCNS 采用光刻工艺在介电常数为 3.55、厚度为 0.787 mm 的单层 Rogers RO4003 基板上制造。MCNS 在所有输入和输出端口提供出色的回波损耗特性。经测量，所需频段内所有输出端口的隔离度均优于 20 dB。它在所有输入和输出端口之间实现了良好的耦合。仿真和测量结果表明，MCNS在10 GHz下具有较好的性能参数，可用于单脉冲天线。