A Wideband and Wide-Scanning Circularly Polarized Tightly Coupled Dipole Array with Low Profile for L-band Satellite Communication Applications

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Affiliation of Author(s):[1]Univ Elect Sci & Technol China, Sch Elect Sci & Engn, EHF Key Lab Fundamental Sci, Chengdu 611731, Peoples R China

Journal:2024 INTERNATIONAL CONFERENCE ON MICROWAVE AND MILLIMETER WAVE TECHNOLOGY, ICMMT

Key Words:L-band; tightly coupled dipole array; circularly polarized; wideband; wide-scanning

Abstract:This paper proposes a wideband and wide-scanning circularly polarized tightly coupled dipole array (TCDA). To obtain better circular polarization performance, this array innovatively uses a multi-ridge resonance suppression structure based on the ridged waveguide, which solves the problem of introducing common-mode resonances when a dual-linear polarization is fed by concentric radiators. Additionally, a folded Marchand balun is used to provide balanced feeding for the array, and two layers of frequency-selective surfaces (FSSs) are employed to enhance impedance matching, achieving a 60 degrees scanning from 0.9GHz to 1.4GHz with voltage standing wave ratio (VSWR) below 3.75 in the operating frequency bands. Furthermore, the array has a low profile of 0.15 lambda(low), where lambda(low) represents the free space wavelength at the lowest frequency of 0.9GHz. It is beneficial for miniaturized design and has broad application prospects in satellite communication.

Document Type:Proceedings Paper

Issue:2024

ISSN No.:2994-3132

Translation or Not:no