Small microstrip patch antennas with short‐pin using a dual‐band operation

This article presents the design and fabrication of a short‐pin dual‐band E‐shaped microstrip patch antenna for application in a 2.630–2.655 GHz band satellite‐DMB with a 5.725–5.825 GHz band wireless LAN. The prototype consist of a short‐pin and E‐shaped patch. To obtain sufficient bandwidth in VSWR < 2, an air layer is inserted between the ground plane and the substrate. A small short‐pin patch that has a dual‐band characteristic is used. Important design parameters are the slot's existence, length, the air‐gap's height, the feed point's position, and the short‐pin's existence and point position. From these optimized parameters, an E‐shaped antenna is fabricated and measured. The measured results of the fabricated antenna are obtained individually at 200 and 700 MHz bandwidths in VSWR < 2 referenced to the center frequency, and the individual gain at 8.79 and 10.26 dBi. The experimental 3 dB beam width is shown to be broad across the pass band in the E‐plane, and in the H‐plane is individually 73°, 65°, 74°, and 42°, respectively.