宽带锐截止波导高通滤波器的设计

Design of Broad Band High-Pass Waveguide Filters with Extremely Steep Cutoff

设计了一款锐截止脊波导高通滤波器,运用新颖的连续指数渐变波导的设计方法,将截止频率附近剧烈变化的波导阻抗和传输常数,在有限长度内实现良好匹配,并在宽带内对整个滤波器进行优化,通带带宽为倍频程,通带低频距截止频率仅1%,阻带35dB,抑制点距截止频率仅4%的单脊波导高通滤波器。该设计方法还可以推广应用在波导尺寸不连续的波导过渡段。

A Steep cutoff ridge waveguide high-pass filter is designed in this paper, a new method is described for the design of continuous exponential waveguide tapers. When the pass frequencies are critically close to the cutoff frequency, the characteristic impedance and propagation constant are sensitive, and changes largely, so it is important for the well matched infinite length waveguide. In this design example, the bandwidth is frequency doubling, optimize the whole filter, with a 1% separation between the pass-band and 4% separation between the stop band, and the stop attenuation is 35 dB. The design approach is also recommended for use in transitioning between different waveguide sizes.