Title :
Broadband gap-coupled microstrip antenna arrays
Author :
Qing Song ; Xue-Xia Zhang
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
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;
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
DOI :
10.1109/APS.1992.221491
