具有可移动传输零点的二阶带通滤波器设计方法研究

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关键词：带通滤波器；可移动传输零点；等效电路；设计方法

中图分类号： TN713 +.5

文献标识码：A

DOI：10.14106/j.cnki.1001-2028.2025.1511

引用格式：杨秀强. 具有可移动传输零点的二阶带通滤波器设计方法研究 [J]. 电子元件与材料， 2025， 44（2）： 171-176.

Reference format： YANG Xiuqiang. Design of second-order bandpass filter with adjustable transmission zero [J]. Electronic Components and Materials， 2025， 44（2）： 171-176.

Design of second-order bandpass filter with adjustable transmission zero

YANG Xiuqiang

（Chengdu Seekon Microwave Communications Co.， Ltd.， The 29th Research Institute of China Electronics Technology

Group Corporation， Chengdu 610091， China）

Abstract： Transmission zero can effectively improve frequency selectivity and out-of-band suppression of the bandpass filter. A second-order bandpass filter with adjustable transmission zero was proposed to meet different technical requirement. The equivalent circuit was set up for basic structures， and then the whole equivalent circuit of the filter was obtained. Such the physical mechanism of the filter was revealed， including the generation mechanism of both resonances and transmission zero. At the same time， the explicit formulas describing the relationship between circuit elements and electric parameters were derived. These formulas can be used in the design method to calculate initial electric parameters according to technical specifications of the filter， by which the time was effectively saved. In this paper， two filter examples with the same center frequency at 2.0 GHz and relative bandwidth of 6% were designed， and the transmission zero can be shifted at the either side of the passband.

Keywords： bandpass filter; adjustable transmission zero; equivalent circuit; design method

射频滤波器是一种用于选择性地通过或抑制特定频率范围内信号的电路器件，广泛应用于无线通信、雷达系统、无线电接收机和发射机等设备中 [1-2]。（剩余6407字）