Abstract :
Planar arrays for use with the GPS receiver and/or GSM handsets have been developed. The main purpose of the paper is to present two-band antennas: the stacked array of microstrip rectangular-ring patches and the two-patches planar inverted-F (PIFA) antenna. For the analysis of the first one, we use the desegmentation technique and multiport network modelling approach, providing a detailed equivalent network representation of the microstrip patches, the mutual coupling among them and the probe-feed. This method is a convenient framework for CAD of microstrip patch antennas composed of parts with holes, openings or other irregularities placed on rectangular or circular patches. In the second case, the wire-grid model and method of moments are used for treating the whole radiating structure composed of the PIFA and supporting box of the cellular phone terminal. Both antennas cover two-bands, 1227/1575 MHz and 900/1800 MHz, for GPS and GSM respectively, with VSWR less than 1:2, and good axial ratio. CAD simulation and experiments agree favorably.
Keywords :
Global Positioning System; UHF antennas; antenna radiation patterns; cellular radio; electromagnetic coupling; equivalent circuits; method of moments; microstrip antennas; mobile antennas; mobile handsets; multifrequency antennas; receiving antennas; 1227 MHz; 1575 MHz; 1800 MHz; 20 MHz; 900 MHz; CAD; GPS receivers; GSM handsets; VSWR; axial ratio; desegmentation technique; equivalent network representation; method of moments; microstrip antenna; multiport network modelling; mutual coupling; planar arrays; planar inverted-F antenna; radiation pattern; rectangular-ring patches; stacked array; two-band antennas; wire-grid model; GSM; Global Positioning System; Microstrip antenna arrays; Microstrip antennas; Microstrip components; Moment methods; Mutual coupling; Patch antennas; Planar arrays; Telephone sets;
