Design of Broadband Circularly Polarized Square Slot Antenna with a Compact Size

Provided by: EMW Publishing
Topic: Mobility
Format: PDF
In this paper, the authors propose a newly designed compact coplanar-waveguide-fed wideband Circularly Polarized (CP) Printed Square Slot Antenna (PSSA), in the square slot of which is a halberd-shaped feeding signal line and a square ring patch. By placing a specially designed metal reflector behind the bidirectional CP PSSA, one can obtain unidirectional CP patterns with an associated 3dB Axial-Ratio BandWidth (ARBW) almost the same as that of the bidirectional antenna. The bidirectional L and S-band PSSAs designed on FR4 substrates have 3dB ARBWs as large as 25.3% and 29.1%, respectively.

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