SCRLH-TL Based Sequential Rotation Feed Network for Broadband Circularly Polarized Antenna Array

Radioengineering. 2016;25(1):81-88

 

Journal Homepage

Journal Title: Radioengineering

ISSN: 1210-2512 (Print); 1805-9600 (Online)

Publisher: Spolecnost pro radioelektronicke inzenyrstvi

LCC Subject Category: Technology: Electrical engineering. Electronics. Nuclear engineering

Country of publisher: Czech Republic

Language of fulltext: English

Full-text formats available: PDF

 

AUTHORS

B. F. Zong
G. M. Wang
H. Y. Zeng
Y. W. Wang
D. Wang

EDITORIAL INFORMATION

Peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

In this paper, a broadband circularly polarized (CP) microstrip antenna array using composite right/left-handed transmission line (SCRLH-TL) based sequential rotation (SR) feed network is presented. The characteristics of a SCRLH-TL are initially investigated. Then, a broadband and low insertion loss 45º phase shifter is designed using the SCRLH-TL and the phase shifter is employed in constructing a SR feed network for CP antenna array. To validate the design method of the SR feed network, a 2×2 antenna array comprising sequentially rotated coupled stacked CP antenna elements is designed, fabricated and measured. Both the simulated and measured results indicate that the performances of the antenna element are further enhanced when the SR network is used. The antenna array exhibits the VSWR less than 1.8 dB from 4 GHz to 7 GHz and the 3 dB axial ratio (AR) from 4.4 GHz to 6.8 GHz. Also, high peak gain of 13.7 dBic is obtained. Besides, the normalized radiation patterns at the operating frequencies are symmetrical and the side lobe levels are low at φ=0º and φ=90º.