A patch antenna with a rectangular-loop feed

The characteristics of a rectangular-loop fed patch antenna with radiation patterns similar to a 2 /spl times/ 1 monopole array are presented. The loop is equivalent to a L-probe with the end shorted to ground. The proposed antenna consists of two patches which are excited by two rectangular-loops respectively. It is designed to operate at both GSM and PCS bandwidths, with resonant frequencies of 870.75 and 1773 MHz, respectively. The distance between each patch and the ground plane is 0.1 free space wavelength at their resonant frequencies. Foam is used as the dielectric substrate. Each patch radiates with a null in the direction normal to the patch, and an elliptical pattern on the horizontal plane. This antenna can be used for indoor wireless communication systems. The commercial simulation software IE3D was used to predict the characteristics of this antennas such as the resonant frequencies, impedance bandwidth and radiation patterns. Experimental and simulation results are shown to be in good agreement.