A High-Selectivity Filtering Antenna Based on Dual-Post Coaxial Resonators

In this communication, a compact waveguide filtering antenna is designed using dual-post coaxial resonators. The dual-post coaxial resonator consists of a pair of identical metal posts, capable of generating two resonant modes with identical and opposite electric field directions, respectively. The...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 72; no. 2; pp. 1899 - 1904
Main Authors Ma, Jun, Xiang, Kai-Ran, Chen, Fu-Chang
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Antenna measurements
Antennas
Bandwidth
Coupling
Dual-post coaxial resonator
Electric fields
Electric filters
Filtering
filtering antenna
Microwave filters
Resonant frequency
Resonators
synthesis theory
Topology
transmission zeros (TZs)
waveguide antenna
Waveguides
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Summary:In this communication, a compact waveguide filtering antenna is designed using dual-post coaxial resonators. The dual-post coaxial resonator consists of a pair of identical metal posts, capable of generating two resonant modes with identical and opposite electric field directions, respectively. The coupling post structure is employed to excite the two modes to achieve positive coupling and negative coupling. The combination of different dual-post coaxial resonators can be used to design higher order filters with transverse topology, realizing multiple transmission zeros. Furthermore, additional transmission zeros can be generated through direct coupling between the source and load, resulting in enhanced out-of-band rejection performance. A fourth-order waveguide filtering antenna is fabricated and measured, achieving high-selectivity performance.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2024.3350345