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Broadband CPW-Fed Circularly Polarized Square Slot Antenna With Three Inverted-L-Shape Grounded Strips

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4 Author(s)
Felegari, N. ; Sonqhor Branch, Fac. of Electr. Eng., Islamic Azad Univ., Sonqhor, Iran ; Nourinia, J. ; Ghobadi, C. ; Pourahmadazar, J.

A new form CPW-fed broadband circularly polarized square slot antenna (CPSSA) with three inverted-L-shape grounded strips around the corners of the slot is proposed and fabricated. In comparison to the previous CPSSA structures, the axial-ratio (AR) bandwidth of the antenna is increased, which is two times wider than the previous proposed design. By embedding the L-shape strip to the ground plane and using the vertical stub to the feed line, very good axial-ratio bandwidth is obtained. The measured impedance bandwidth and AR of the realized CPSS antenna with optimized parameters is from 2 to 7 GHz (3.5:1, 110%) for VSWR ≤ 2 and 2-5 GHz (2.5:1; 85%) for AR ≤ 3 dB respectively. Throughout this letter, the improvement process of the AR and S11 properties is completely presented and discussed.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:10 )