Abstract

A waveguide planar bandpass filter for 2-cm wavelength range (13.5–14.5 GHz) with an ultra-wide stopband (up to the 6th harmonic of the central frequency of the bandwidth) is proposed, developed and experimentally investigated in this article. The filter with a bandwidth is designed on the basis of the antipodal fin-line (AFL) with an extremely high overlap of ridges, which has an overlap size to a waveguide height ratio is equal to 0.773. It allows to significantly reduce the cross-section of the filter waveguide chamber. The compact waveguide planar transformers located on the same substrate are used as the input and output transformers of the filter. It excludes the influence of inaccuracy in the filter structure adjustment relative to the joints with the supply waveguides. Despite the smallness of the resonators longitudinal dimensions in comparison with the half-wavelength in a AFL, the filter synthesis with an acceptable for practice accuracy can be carried out according to Cohn method, modified for its specified feature. At the same time, the decrease in the filter resonators’ intrinsic Q-factor, associated with a strong overlap of the AFL ridges, leads to dimension correction. However, this correction is performed in one of the common program packages of electrodynamic analysis based on the measuring results of the filter resonators’ intrinsic Q-factor.

中文翻译：

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具有超宽阻带的波导平面电子平面滤波器

摘要

本文提出，开发和实验研究了2 cm波长范围（13.5-14.5 GHz）且具有超宽阻带（高达带宽中心频率的6次谐波）的波导平面带通滤波器。具有带宽的滤波器是基于对极鳍线（AFL）设计的，其脊的重叠度非常高，其重叠尺寸与波导高度之比等于0.773。这允许显着减小滤波器波导室的横截面。位于同一基板上的紧凑型波导平面变压器被用作滤波器的输入和输出变压器。相对于与供应波导的接头，它消除了滤波器结构调整中不精确的影响。尽管与AFL中的半波长相比，谐振器的纵向尺寸较小，但可以根据Cohn方法（针对其特定功能进行修改）按照实用精度进行滤波器合成。同时，与AFL脊强烈重叠相关的滤波器谐振器固有Q因子的减小导致尺寸校正。但是，此校正是基于滤波器谐振器固有Q因子的测量结果在电动力学分析的通用程序包之一中进行的。与AFL脊的强烈重叠相关联，可进行尺寸校正。但是，此校正是基于滤波器谐振器固有Q因子的测量结果在电动力学分析的通用程序包之一中进行的。与AFL脊的强烈重叠相关联，可进行尺寸校正。但是，此校正是基于滤波器谐振器固有Q因子的测量结果在电动力学分析的通用程序包之一中进行的。