Broadband gap-coupled microstrip antenna arrays

Author

Qing Song ; Xue-Xia Zhang

Author_Institution

Dept. of Electron. Eng., Tsinghua Univ., Beijing, China

fYear

1992

fDate

18-25 June 1992

Firstpage

1939

Abstract

In order to increase the bandwidth of microstrip antennas, an antenna array using gap-coupled patches as the elements is proposed. The input impedance characteristics of gap-coupled patches are analyzed by the dyadic Green´s function for a grounded dielectric slab and the moment method. The input impedance of gap-coupled patch arrays is by combination with the antenna elements and the feed network that consists of divider tees, bends and feed line. In addition, considering the surface currents solved from the integral equation, the far field patterns of gap-coupled patch arrays are calculated. Comparison with the ordinary rectangular patch arrays is made. It turns out that the impedance bandwidth for a voltage standing wave ratio of less than 2 of the two-element gap-coupled patch array is much wider than that of the ordinary patch antenna array. All microstrip antennas have been designed and fabricated on substrate with in /sub r/=2.86, h=1.5 mm.<>

Keywords

Green´s function methods; antenna radiation patterns; electric impedance; microstrip antennas; microwave antenna arrays; microwave measurement; VSWR; antenna elements; antenna radiation patterns; bandwidth; bends; broadband antennas; divider tees; dyadic Green´s function; far field patterns; feed line; feed network; gap-coupled patch arrays; grounded dielectric slab; impedance bandwidth; input impedance; integral equation; microstrip antenna arrays; rectangular patch arrays; surface currents; voltage standing wave ratio; Antenna arrays; Bandwidth; Broadband antennas; Dielectrics; Feeds; Green´s function methods; Microstrip antenna arrays; Microstrip antennas; Slabs; Surface impedance;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE

Conference_Location

Chicago, IL, USA

Print_ISBN

0-7803-0730-5

Type

conf

DOI

10.1109/APS.1992.221491

Filename

221491