Frequency Reconfigurable Patch Antenna Using Pin Diodes with Directive and Fixed Radiation Pattern

This paper presents a frequency reconfigurable antenna, based on four PIN diodes implemented on one of each corner of a rectangular patch antenna. A combination of three switching configurations of the PIN diodes provides a current path modification, and consequently a variation on the operating frequencies. Simulated results are presented based on two approaches, the ideal case using a metal portion and the schematic case employing the equivalent circuit of the PIN diode. The proposed antenna is suitable for 5 GHz U-NII band. Results are obtained by using CST-MW simulator.