RESONANT-FREQUENCY OF A MICROSTRIP PATCH IN THE VICINITY OF AN IDENTICAL RADIATOR

The resonant frequency of a microstrip patch (rectangular, square, and circular) changes as soon as an identical patch is brought closer tha n 0.2 lambda to it. Closed-form expressions are presented for the H-pl ane-coupled configuration (the two adjacent patches are excited by sam e phase excitation) from which this altered resonant frequency may be easily computed. From the same expression the resonant frequency of an isolated patch antenna may also be calculated. A procedure utilizing these closed-form expressions for the design of microstrip patch anten nas which will resonate at the desired frequency is also outlined. The se expressions may be readily used in the computer-aided design of mic rostrip antenna arrays. (C) 1996 John Wiley & Sons, Inc.