Abstract
Direct matching of a reduced-size, broadband circular microstrip antenna with a 50 Ω microstrip-line feed is described. This design is achieved simply by loading a 1 Ω chip resistor near the edge of the circular patch, which significantly reduces the resonant frequency of the microstrip patch, broadens the operating bandwidth, and causes a wide variation in the input impedance along the patch edge. The last behavior makes direct matching of the antenna with a 50 Ω microstrip line possible. Several typical designs are presented. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 17: 53–55, 1998.
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