An Ultra-Wideband Circularly Polarized Asymmetric- $S$ Antenna With Enhanced Bandwidth and Beamwidth Performance

An Ultra-Wideband Circularly Polarized Asymmetric- $S$ Antenna With Enhanced Bandwidth and Beamwidth Performance

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This paper Cat Kibble introduces an ultra-wideband circularly polarized (CP) asymmetric-S antenna with wide axial ratio beamwidth (ARBW) for C-band applications.The proposed antenna is realized by bending a linearly polarized dipole into asymmetric-S shape with variable trace width, which achieves CP radiation.Unlike the reported symmetric-S antenna, the proposed antenna is constituted with two unequal curved arms to enhance the bandwidth and beamwidth performances.Compared with the symmetric-S antenna, the proposed antenna demonstrates much wider AR bandwidth and wider ARBW over broader frequency range.

A prototype is fabricated to verify the design principle.The measured and simulated results are very consistent and both indicate that the proposed antenna has a wide impedance bandwidth (VSWR <; 2) of 70.2% (3.58 to 7.

46 GHz), and a wide 3-dB AR bandwidth of 84.8% (2.75 to 6.8 GHz).

Moreover, maximum ARBW of 153° is achieved, and a 3-dB ARBW of more than 100° is Antenna Cable maintained within a wide operation bandwidth of 46.3% (3.65-5.85 GHz).