ABSTRACT A novel three-in-one waveguide resonator is proposed in the paper. The resonator is composed of three rectangular partial-height posts inserted along a rectangular waveguide cross-section. A pair of posts is mounted symmetrically whereas the third antipodal post is centered. The resonator provides a bandstop response if all the posts are of equal height. Both singlet-type and pseudoelliptic characteristics are achieved if one of the posts differs by its height. Both symmetric and asymmetric configurations are considered. Besides, it is demonstrated that the asymmetric resonator acts as a switching waveguide filter providing the ON and the OFF states to allow/block the signal propagation in a narrow vicinity of a given frequency. A parametric numerical study is performed in order to demonstrate a transformation of the response Measurement data are presented for a single-standing resonator and a two-section pseudoelliptic filter in WR90 waveguide.

中文翻译：

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矩形波导中的三柱谐振器

摘要 本文提出了一种新型的三合一波导谐振器。谐振器由沿矩形波导横截面插入的三个矩形局部高度柱组成。一对立柱对称安装，而第三个对足立柱居中。如果所有柱高度相等，则谐振器提供带阻响应。如果其中一根柱子的高度不同，则可以实现单线型和伪椭圆两种特性。对称和非对称配置都被考虑。此外，还证明了非对称谐振器充当开关波导滤波器，提供 ON 和 OFF 状态以允许/阻止信号在给定频率的狭窄附近传播。