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2017-09-21

Wideband Omnidirectional Circularly Polarized Patch Antenna with Multi-Resonant Structure

By Long Yang, Zhi-Ya Zhang, Luyang Ji, Dan Wu, Guang Fu, and Ze-Hong Yan
Progress In Electromagnetics Research C, Vol. 78, 47-55, 2017
doi:10.2528/PIERC17071301

Abstract

A wideband omnidirectional circularly polarized (CP) patch antenna is proposed in this paper. The proposed antenna is composed of a disk-loaded coaxial probe and four pairs of modified Γ-shaped strips loaded with shorting pins. Each pair of modified Γ-shaped strips consists of an inner Γ-shaped strip and an outer Γ-shaped strip. The approach employed in this design to improve the impedance bandwidth is to add an inner Γ-shaped strip and make it couple to the outer one. By introducing the two coupled Γ-shaped strips, two different monopole modes can be achieved simultaneously and controlled separately by two different corresponding parts of these two Γ-shaped strips, respectively, and they can be merged to realize a wide-band impedance matching. Meanwhile, the dual minimum axial ratio (AR) points around the resonance frequency of the antenna are excited by the coupled Γ-shaped strips, and they can be reallocated closely to each other for wide AR bandwidth. In the design, the monopole mode of the patch antenna is excited by the disk-loaded coaxial probe for generating the θ-polarization and the Γ-shaped strips are utilized for achieving the φ-polarization. Omnidirectional CP radiation pattern is obtained once the two orthogonal components are equal in amplitude but in phase quadrature. is conducted to further verify the proposed design.

Citation


Long Yang, Zhi-Ya Zhang, Luyang Ji, Dan Wu, Guang Fu, and Ze-Hong Yan, "Wideband Omnidirectional Circularly Polarized Patch Antenna with Multi-Resonant Structure," Progress In Electromagnetics Research C, Vol. 78, 47-55, 2017.
doi:10.2528/PIERC17071301
http://jpier.org/PIERC/pier.php?paper=17071301

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