Extension of cavity method to analyze the aperture-coupled microstrip patch antenna with a tilted feeding line

In this paper; the tilt (theta) of a feedline with regard to a slot is take n into account to improve the cavity model, and also to see rite effect of this angle a on the input impedance. In fact the angle is introduced in the voltage discontinuity of the slot on the feeding line. The computed result s are compared to experiments with several theta-tilts, and give good resul ts. (C) 1999 John Wiley & Sons, Inc.