A wide-band dual-polarization patch antenna with directional coupler

Author

Lau, K.L. ; Luk, K.M. ; Lin, Deyun

Author_Institution

Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China

Volume

1

Issue

1

fYear

2002

fDate

6/24/1905 12:00:00 AM

Firstpage

186

Lastpage

189

Abstract

A broad-band dual-polarization patch antenna fed by L-shaped probes at the patch corners is presented. A coupled line directional coupler mounted at the back of the ground plane is used to enhance the isolation between the L-probes to a large extent. Through using the coupler to feed the L-probes, the isolation between the input ports is 34 dB over the GSM900 operating bandwidth, which has enhanced by 14 dB. By using two plastic spacers of 0.1/spl lambda//sub o/ in height to support the patch in the air, an impedance bandwidth of 18% (for S/sub 11//spl les/-14 dB), and an average gain of 7 dBi can be obtained for both ports. The far field patterns are stable across the passband. This antenna can potentially be used as a GSM900 base station antenna.

Keywords

UHF antennas; antenna feeds; antenna radiation patterns; broadband antennas; directional couplers; microstrip antennas; 7 dB; GSM900; L-shaped probes; broad-band dual-polarization patch antenna; coupled line directional coupler; directional coupler; far field patterns; gain; impedance bandwidth; isolation; plastic spacers; wide-band dual-polarization patch antenna; Bandwidth; Base stations; Broadband antennas; Directional couplers; Feeds; Impedance; Passband; Patch antennas; Plastics; Probes;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2002.807784

Filename

1177192