Design of a double feed circularly polarized rectangular microstrip patch antenna on a circular asymmetrical carrier

Abstract

Circular symmetrical ground planes such as square and circular ones are always utilized in the design of circularly polarized antennas. However, carriers in practical applications are mostly circular asymmetrical, which will impose an effect on the circular polarization performance of the circularly polarized antenna. The characteristics of a circularly polarized microstrip patch antenna with a circular asymmetrical ground plane are analyzed through simulation in this paper. The reason for deterioration of the circular polarization performance is discussed, on the basis of which an improved method is proposed to design a dual-feed circularly polarized rectangular microstrip patch antenna on a circular asymmetrical carrier. The antenna is fabricated and measured. Measured results show that performance of the antenna is remarkably improved.

Broadband Circular Polarization Antenna Based on Inverted Suspended Circular Patch with Square Slot

“…Microstrip patch antenna in their basic form normally provides linear polarization, but by certain modification it can provide circular polarization. The circular polarized antenna can be obtained by using single or double feed [1,14], truncated corner [2,15], slot [15], double layer.…”

Design and characterization of an efficient multi-layered circularly polarized microstrip antenna

“…Furthermore, circularly polarized (CP) antennas are preferred in telecom applications because these antennas provide greater flexibility in alignment angle between transmitter and receiver and reduce polarization mismatch loss at the receiver [6]. Single feed CP microstrip antennas (CPMAs) have usually less complex design as compared to dual feed CPMAs [7–9]. Single feed CPMA design requires a perturbation in the patch radiator at a suitable location relative to feed location to excite two orthogonal modes, which have almost equal amplitude and an odd multiple of 90° phase shift for realization of CP radiation.…”