A study on wideband gap-coupled microstrip antenna arrays

Author

Song, Qing ; Zhang, Xue-Xia

Author_Institution

Beijing Simulation Center, China

Volume

43

Issue

3

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

313

Lastpage

317

Abstract

A method for increasing the bandwidth of microstrip antenna arrays by using gap-coupled patches is described. The input impedance properties of gap-coupled patches are analyzed by the use of the spectral dyadic Green´s function for a grounded dielectric slab and the moment method. The dependence of different parameters such as s, L and εr on the impedance characteristics is investigated. In considering the effect of feed network, the impedance bandwidth for a VSWR<2 of two-element gap-coupled patch array is as large as 2.5 times that of an ordinary array. The radiation patterns over this bandwidth are measured and discussed. All the microstrip antenna arrays are fabricated on a substrate with εr=2.86, h=1.5 mm. A comparison of theoretical and experimental results for both input impedance and radiation patterns are given

Keywords

Green´s function methods; antenna feeds; antenna radiation patterns; electric impedance; method of moments; microstrip antenna arrays; VSWR; bandwidth; feed network; gap-coupled patches; grounded dielectric slab; impedance bandwidth; input impedance; microstrip antenna arrays; moment method; radiation patterns; spectral dyadic Green´s function; wideband gap-coupled arrays; Antenna radiation patterns; Bandwidth; Broadband antennas; Dielectrics; Green´s function methods; Impedance; Microstrip antenna arrays; Microstrip antennas; Moment methods; Slabs;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.372003

Filename

372003