ABSTRACT

In order to meet the development requirements of multi-frequency and functional integration of radio frequency (RF) modules, a broadband tunable filtering power divider with center frequency is designed. A new structure is composed of open branch line, step impedance resonator, and double branch resonator. The filter response is realized by branch line and double branch resonator. The resonant frequency of the device can be adjusted flexibly by controlling the varactor diode loaded on the two resonators with external voltage. The double branch resonator can realize the broadband frequency adjustability, the step impedance resonator can improve part of the return loss performance of the device, so that the central frequency can achieve high performance in a wide tuning range. The research results show that the center frequency of the designed filtering power divider is adjustable in the range of 1.6 GHz to 2.7 GHz, the tuning bandwidth is 51.2%, the input return loss of each center point is better than 20 dB, and the isolation between output ports is better than 19 dB. The device is expected to be widely used in RF communication systems such as array antennas and transceiver components.

摘要

为了满足射频模块多频化、功能集成化的发展要求，设计了一种中心频率宽带可调滤波功分器。一种新的结构由开路分支线、阶跃阻抗谐振器和双分支谐振器组成。滤波器响应由支路和双支路谐振器实现。通过外部电压控制两个谐振器上加载的变容二极管，可以灵活调节装置的谐振频率。双支路谐振器可实现宽带频率可调，阶跃阻抗谐振器可改善器件的部分回波损耗性能，使中心频率在较宽的调谐范围内实现高性能。研究结果表明，所设计的滤波功分器中心频率在1.6 GHz~2.7 GHz范围内可调，调谐带宽为51.2%，每个中心点的输入回波损耗优于20 dB，隔离度高。输出端口之间的噪声优于 19 dB。该器件预计将广泛应用于阵列天线和收发器组件等射频通信系统。