Dual-frequency rectangular microstrip antenna with embedded spur lines and integrated reactive loading

Single-feed dual-frequency operation of a rectangular microstrip antenna with a pair of spur lines at the nonradiating edges and an integrated reactive loading at one of the radiating edges is proposed and experimentally studied. The two operating frequencies have the same polarization planes, and various frequency ratios of the two frequencies within a range of about 1.1-1.6 can be achieved. Details of the design considerations for the proposed antenna are described, and experimental results of the obtained dual-frequency performance are presented and discussed (C) 1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 272-275, 1999.