Title

A Frequency-Reconfigurable Cavity-Backed Slot Antenna Espar In H Plane

Keywords

beam steering; cavity-backed antennas; phased arrays; slot antennas; tunable circuits and devices

Abstract

A novel frequency-reconfigurable cavity-backed slot antenna ESPAR in the H plane is presented in this paper. Similar to other ESPAR antennas, the two parasitic cavities lying in the H plane are fed by the center driven cavity through coupling irises and terminated with varactors to provide variable loading impedances. By properly designing the loading impedance, continuous beamscanning in the H plane can be realized. Additionally, a pair of varactors are placed in the center of the slot to achieve a 47.7% frequency tuning range, while preserving the beamscanning performance at each operating frequency. Therefore, the proposed ESPAR is able to provide frequency diversity in addition to spatial diversity inherent in a fixed-frequency ESPAR. It is shown that the proposed ESPAR can steer its beam from -26 to 26 degrees in the H plane. By properly adjusting the frequency tuning varactors, the ESPAR can operate from 4.22 to 6.82 GHz and the impedance matching is maintained for all beamscanning angles.

Publication Date

1-1-2018

Publication Title

2018 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting, APSURSI 2018 - Proceedings

Number of Pages

1917-1918

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/APUSNCURSINRSM.2018.8609292

Socpus ID

85061895634 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85061895634

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