Abstract
The sequential phase rotation (SPR) technique has been used to enhance the impedance and axial ratio bandwidths of the CP array antennas. In this paper, a broad band CP antenna array for X-band applications using SPR technique is designed and analyzed. The designed antenna is capable of operating between 8.93 GHz–12.82 GHz while the S11 is less than -10 dB and exhibits CP operation between 9.23 GHz and 12.47 GHz with an axial ratio less than 3 dB. The array attains the maximum peak gain of 9.88 dB. The CP array can produce good circular polarization over the broad band frequencies by utilizing the square patch with truncated corners as the basic element of the array and providing the suitable amount of sequential phase among the elements. This array may find widespread applications in radar and satellite communications. The array antenna was fabricated and tested. There is a good agreement between simulated and measured results.
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