Single-Fed High-Gain Circularly Polarized Microstrip Antenna

Abstract

In this paper, a single-fed high-gain circularly polarized microstrip antenna is proposed. The circular polarization is obtained by two unequal-length arc-shaped radiation patches, which excite two orthogonal linearly polarized modes with a 90 • phase difference. The antenna is excited by coaxial feed. The proposed circularly polarized antenna consists of two arc-shaped radiation patches and a ground plane, which has a simple structure and a higher gain than 10.0 dB. The antenna is fabricated and measured to verify the design. The measured results are in good agreements with the simulated ones. The measured results show that the impendence bandwidth (IBW) for S 11 < −10 dB is 16.7% (3.78-4.47 GHz), and the axial-ratio bandwidth (ARBW) for AR < 3 dB is 3.6% (4.09-4.24 GHz). Further, the gain is higher than 10.0 dB from 4.09 to 4.24 GHz. The antenna radiation pattern performs well over the whole band, and the peak gain can reach 10.67 dB at 4.11 GHz. It is a good candidate for advanced wireless communication systems.

Array Design of 300 GHz Dual-Band Microstrip Antenna Based on Dual-Surfaced Multiple Split-Ring Resonators

“…Therefore, the dual-band antenna structure still needs to be properly optimized to increase its communication bandwidth. There are many methods to increase the bandwidth of microstrip antennas, such as slotting the antenna structure to change the current path [ 24 , 25 , 26 ], loading short-circuit probes [ 27 ], attaching parasitic patches [ 28 ], changing the thickness and dielectric of the dielectric substrate electric constant [ 29 ], and so on.…”

A compact triple band circular polarized slotted microstrip patch antenna with low frequency ratio

“…1,2 Although most of the microstrip patch antennas are linearly polarized, due to varied condition in wireless propagation channels and multipath effects, there can be polarization mismatch between the transmitter and receiver antennas in line-of-sight communication due to rotation of transmitted field vector thereby introducing polarization mismatch loss which degrades the link budget of the system. 3 Hence, circularly polarized antennas are desirable which gives flexibility in the orientation of the transmitting and receiving antennas without any polarization mismatch 4 which gives added benefits like resistance to signal degradation due to atmospheric conditions, high penetration capability, reduces multipath effects, 5,6 flexibility in orientation of the transmission and receiving antenna, improved propagation quality in multipath environments.…”