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Broadband Circularly Polarized Slot Antenna Array Using Sequentially Rotated Technique for C -Band Applications

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5 Author(s)
Rafii, V. ; Dept. of Electr. & Electron. Eng., Urmia Univ., Urmia, Iran ; Nourinia, J. ; Ghobadi, C. ; Pourahmadazar, J.
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This letter presents the investigation results on a novel circularly polarized square-slot antenna (CPSSA) array designed to operate at a frequency of 5.5 GHz. In order to realize the proposed antenna array, four miniature circular polarized square-slot antennas are used with L-shape grounded strips located at the slots' opposite corners to reduce cross polarization. The antenna is fed by symmetric coplanar waveguide. The CPSSA element achieves a bandwidth of 16.6% for an axial ratio ≤ 3&nbsp;dB. The CPSSA's performance is further enhanced with the construction of a novel 2&nbsp;&times;&nbsp; 2 antenna array that is designed using sequentially rotated feed technique. The 3-dB axial ratio of the array extends to approximately 2 GHz with an impedance bandwidth of 31%. The CPSSA array was designed to operate over the frequency range between 4 and 6.825 GHz corresponding to an impedance bandwidth of 52% for VSWR <; 2 (1.71:1). Acceptable agreement between the simulation and measured results validates the proposed design.

Published in:

Antennas and Wireless Propagation Letters, IEEE  (Volume:12 )

Date of Publication:

2013

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