A Small-Size Dual-Feed Broadband Circularly Polarized U-Slot Patch Antenna

Author

Mang He ; Xihong Ye ; Pingyuan Zhou ; Guoqiang Zhao ; Chuanfang Zhang ; Houjun Sun

Author_Institution

Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China

Volume

14

fYear

2015

fDate

2015

Firstpage

898

Lastpage

901

Abstract

A small-size broadband circularly polarized U-slot patch antenna with dual-feed is proposed. By introducing an additional feeding probe near the vertical slot of the conventional singly fed square U-slot patch antenna printed on a high-permittivity substrate, two series resonances in close proximity are excited. The two resonant frequencies are found to be independent of the orientation of U-slot with respect to the patch, and broadband circular polarization is achieved by introducing a nonquadrature phase difference between two feeding ports. Experimental results show that the overlapped bandwidth of VSWR ≤ 1.5 and AR ≤ 3 dB is over 20% with a small overall size of 0.33λ₀ × 0.33λ₀ × 0.068λ₀, where λ₀ is the free-space wavelength at the center frequency within the operating band.

Keywords

antenna feeds; antenna radiation patterns; broadband antennas; microstrip antennas; multifrequency antennas; permittivity; slot antennas; center frequency; close proximity; feeding ports; feeding probe; free-space wavelength; high-permittivity substrate; nonquadrature phase difference; resonant frequency; series resonances; small-size dual-feed broadband circularly polarized U-slot patch antenna; vertical slot; Antenna feeds; Antenna measurements; Bandwidth; Broadband antennas; Broadband communication; Microstrip antennas; Broadband; U-slot patch patch antenna; circular polarization; small size;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2014.2384496

Filename

6994273