交指形哑铃带隙结构的小型化带通滤波器设计

Design of compact bandpass filter using dumb-bell interdigital slot structure

设计了一种交指形哑铃带隙结构的带通滤波器,在传统哑铃结构的基础上,把直线臂改进为交指形结构,增加了开路枝节,从而增加等效并联电容,实现了滤波器的小型化。与传统结构相比,新设计的结构尺寸减小了16%,并在阻带增加了2个传输零点,抑制了寄生通带。

An interdigital dumb-bell slot resonator bandpass microstrip filter is proposed in this paper, which changes the line arm into interdigital structure. It opens stub to enhance the parallel equivalent capacitance efficiently, leading to size reduction of the filter. Compared with the traditional structure filter the proposed filter has a size reduction of 16%. Two transmission zeros are increased in its＇ stopband and harmonics output is successfully suppressed.