Journal of Electromagnetic Waves and Applications
ISSN: 0920-5071 (Print) 1569-3937 (Online) Journal homepage: https://www.tandfonline.com/loi/tewa20
Tri-post resonator in a rectangular waveguide
Lyudmila P. Mospan
To cite this article: Lyudmila P. Mospan (2020): Tri-post resonator in a rectangular waveguide, Journal of Electromagnetic Waves and Applications, DOI: 10.1080/09205071.2020.1728392
To link to this article: https://doi.org/10.1080/09205071.2020.1728392
Published online: 19 Feb 2020.
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JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS https://doi.org/10.1080/09205071.2020.1728392
Tri-post resonator in a rectangular waveguide
Lyudmila P. Mospan
a,b
aComputational Electromagnetics Laboratory, O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkov, Ukraine; bO.M. Beketov National University of Urban Economy in Kharkiv, Kharkov, Ukraine
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.
ARTICLE HISTORY
Received 4 November 2019
Accepted 5 February 2020
KEYWORDS
Waveguide filters; waveguide switch; bandpass filters; elliptic filters; singlet; transmission zeros
Introduction
Microwave filters providing elliptical or pseudoelliptic frequency responses are very demanded in modern telecommunication systems owing to their high selectivity [1,2]. It is highly desirable to generate such a multi-pole response without increasing both transversal and longitudinal dimensions of the filter. A way to achieve this goal was proposed in [3–5]. It was shown that cutting an additional slot in a classic resonant diaphragm allowed to generate an attenuation pole in its response. Proposed approach was successfully used in the design of bandpass filters with improved out-of-band responses [6–8]. Besides, a dual-behavior frequency-selective surface-based resonator for a waveguide filter with multiple attenuation poles was proposed in [9,10]. Numerical and experimental data for pseudoelliptic filters based on the sections with and without a dielectric support were reported.
Thin waveguide sections with partial-height posts of different heights inserted along their cross-sections are among the perspective components of the microwave filters as
CONTACT Lyudmila P. Mospan lyudmila.mospan@gmail.com Computational Electromagnetics Laboratory, O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine, Kharkov, 12, Acad. Proskury Str., Kharkov 61085, Ukraine
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