In view of parasitic passband in the filtering networks composed of distributed elements, a novel circuit of microstrip bandpass filters is presented in this paper.
针对分布参数滤波网络存在寄生通带问题，本文提出一种新的微带带通滤波电路。
2
This paper presents a simple tracking filter circuit, which is applicable to Doppler radar sets and consists mainly of a switched bandpass filter and a phase-locked loop.
本文提出一种简单的跟踪滤波器电路，该电路可用于多普勒雷达，主要由开关式带通滤波器和锁相环组成。
3
A frequency translation circuit (172-188) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacent channel signals.