4.7 Article

Wideband Circularly Polarized mm-Wave Array Antenna Using H-Shaped Low-Axial-Ratio Apertures

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 71, 期 5, 页码 4564-4569

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2023.3253209

关键词

Bandwidth; Wideband; Shape; Apertures; Arrayed waveguide gratings; Cutoff frequency; Polarization; Antenna arrays; circular polarization (CP); gap waveguide; satellite communications; slotted waveguide arrays

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An H-shaped all-metal radiating element with an active and a coupled slot is proposed for designing wideband high-efficiency circularly polarized antenna arrays. A simple and scalable two-layer corporate network implemented in groove gap waveguide (GGW) technology is conceived to feed an array of such radiating elements. The experimental results of a prototype confirm the good frequency properties, with a 1-dB AR bandwidth of 22%, a peak radiation efficiency of 97%, and an impedance bandwidth of 21%.
An H-shaped all-metal radiating element comprising an active and a coupled slot has been proposed to design wideband high-efficiency circularly polarized antenna arrays. The proper excitation of several modes on the coupled slot enables a wide axial ratio (AR) bandwidth with high circular polarization (CP) purity. To feed an array of such radiating elements, a simple and scalable two-layer corporate network, implemented in groove gap waveguide (GGW) technology, is conceived. Those good frequency properties have been confirmed by the fabrication of a prototype, whose experimental results report a 1-dB AR bandwidth of 22%. In addition, a peak radiation efficiency of 97% with good pattern stability and an impedance bandwidth of 21% with high return loss have been measured. The high CP purity demonstrated by these wideband apertures makes them particularly suitable for Ka-band satellite communications' antennas.

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