Tri-post resonator in a rectangular waveguide

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.

KEYWORDS:

• Waveguide filters
• waveguide switch
• bandpass filters
• elliptic filters
• singlet
• transmission zeros

Acknowledgements

The author believes a pleasant duty to express her gratitude to Prof. A. Kirilenko for a possibility to use MWD-II software [21] developed under his leadership by Drs S. Steshenko, S. Prikolotin and D. Kulik.

Disclosure statement

No potential conflict of interest was reported by the author(s).

ORCID

Lyudmila P. Mospan http://orcid.org/0000-0002-4895-1409

Additional information

Notes on contributors

Lyudmila P. Mospan

Lyudmila P. Mospan (IEEE SM’11) received the MS degree in radio engineering from the Kharkov State University, Kharkov, Ukraine, and the PhD degree in radio engineering from the Institute of Radiophysics and Electronics of National Academy of Sciences of Ukraine (IRE NASU), Kharkov, Ukraine, in 2001. She is currently a Senior Researcher of the Computational Electromagnetics Lab. of IRE NASU and an Associate Professor at O.M. Beketov National University of Urban Economy in Kharkiv, Kharkov, Ukraine. She has co-authored over 100 journal and conference papers. Her research is focused on microwave computer-aided design and resonance phenomena in waveguides and gratings.