High Gain Wideband Circularly Polarized Microstrip Antenna Array

A wideband high gain circularly polarized microstrip antenna (CP MSA) array is presented in this communication. In the proposed CP MSA array, the elements are designed at 3.5 and 5.8 GHz, which are sequentially rotated to form a planar array. The array elements are fed using the TM110 and TM210 modes of a center CP MSA. This arrangement achieves an axial ratio (AR) bandwidth of 63.7% (3.25-6.29 GHz) and improves gain over a wide bandwidth. The peak gain of the array is 17.77 dBic with a 3-dB gain bandwidth of 53.9%. The center MSA of the array is fed using four orthogonal printed L-probes with quadrature phase difference. The proposed CP MSA array has an |S-11| <= -10 dB bandwidth of 63.3% (3.32-6.4 GHz).

Automated summary

This communication presents a wideband high gain circularly polarized microstrip antenna (CP MSA) array. The array achieves high gain and wideband axial ratio by sequentially rotating the designed elements at 3.5 and 5.8 GHz to form a planar array. The elements are fed using different modes of a center CP MSA.