L-probe proximity-fed annular ring microstrip antennas

Author

Guo, Yong-Xin ; Luk, Kwai-Man ; Lee, Kai-Fong

Author_Institution

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

Volume

49

Issue

1

fYear

2001

fDate

1/1/2001 12:00:00 AM

Firstpage

19

Lastpage

21

Abstract

A broadband single-layer annular ring microstrip antenna fed by an L-shaped probe is studied. It achieves, for the TM₁₁ mode, an impedance bandwidth of about 24% [standing wave ratio (SWR) ⩽2], a 3-dB gain bandwidth of 33%, and a maximum gain of 7.5 dBi. For the TM ₁₂ mode, an impedance bandwidth of about 27% (SWR ⩽2), a 3-dB gain bandwidth of 15.5% and a peak gain of 10.3 dBi are obtained. A foam substrate of thickness around 10% of the operating wavelength in free-space is used as the supporting substrate. The far-field radiation patterns are stable across the passband

Keywords

antenna feeds; antenna radiation patterns; electric impedance; microstrip antennas; 10.3 dB; 3-dB gain bandwidth; 3.08 to 3.92 GHz; 6.875 to 9.025 GHz; 7.5 dB; 8.05 to 9.4 GHz; L-shaped probe feed; SWR; TM₁₁ mode; TM₁₂ mode; broadband antenna; far-field radiation patterns; foam substrate; impedance bandwidth; maximum gain; proximity-fed annular ring microstrip antenna; single-layer annular ring microstrip antenna; standing wave ratio; Antenna arrays; Antenna radiation patterns; Bandwidth; Frequency; Impedance; Microstrip antennas; Passband; Patch antennas; Probes; Receiving antennas;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.910524

Filename

910524