MMDS上下变频器的微带叉指带通滤波器

Microstrip interdigital bandpass filters for MMDS up/downconverter application

微带叉指带通滤波器具有结构紧凑，易于批量生产的特点，可用于ＭＭＤＳ接收机中作为镜象频率抑制滤波器或用于上变频器中滤除噪波。文中给出有关设计公式，并举出设计实例，微带基片采用ＲＯ４００３改进型高频环氧玻璃纤维板。

Microstrip-line interdigital band-pass filters are compact and easy for batch process. They are suitable for application in multichannel multipoint distribution system (MMDS), as image-reject band-pass filters in down-converters or spur-reject filters in up-converters. In this paper the design procedure and a workable example using RO4003 high-frequency epoxy substrater are given.