基于HMSIW的小型化三模带通滤波器设计

Design of Miniaturized Three-mode Bandpass Filter Based on HMSIW

传统的多模谐振器引入多个谐振器,并利用其中两个甚至多个谐振模式来组合构建滤波器通带,但由于其谐振器个数较多而在射频系统中占用了较大的空间。为此,本文提出了基于半圆形半模基片集成波导(HMSIW)的三模带通滤波器,通过引入金属化过孔来扰动半圆形HMSIW谐振腔的谐振模式的电场分布,使得对应的谐振模式的频率也会随之发生偏移,进而使原本谐振频率相差较大的三个谐振模式的频率逐渐靠近,最终组合形成滤波器的通带。该设计无需引入额外的谐振器,能够实现滤波器尺寸减半甚至成倍减少,从而达成小型化的目的。

Resonators are introduced in traditional multimode resonators and two or more of them are used to combine and construct the filter passband.However,due to the large number of resonators,they occupy large space in the radio frequency system.Therefore,a three-mode bandpass filter based on semicircular half mode substrate integrated waveguide(HMSIW)is proposed in this paper.The electric field distribution of the resonance mode of the semicircular HMSIW resonator is disturbed by introducing a metallized via,so that the frequency of the corresponding resonance mode will also shift,and then the frequencies of the three resonance modes with large differences in the original resonance frequency will gradually approach,and finally the filter passband will be formed.It does not need to introduce additional resonators,and can reduce the filter size by half or even multiple,thus achieving the goal of miniaturization.