Wireless communication system are being used for a number of applications nowadays and for that, a number of antennas or a single antenna with multiple functional capabilities has become inevitable. This paper attempts to design a frequency
as well as pattern reconfigurable with single rectangular spiral microstrip patch antenna using electrical reconfiguration method. Designed antenna has ability to switch its frequency band and accordingly its pattern is also switch in right side from the main beam direction near 50°, by using pin diode as a switch. Two cases are being taken into account. The first case; when switch is OFF, it gives results in an operation at 1.77 GHz with radiation pattern in elevation plane with θ = 0° and having gain is equal to 4.92 dB and the second case; when switch is ON, it offer operations at 2.47 GHz with radiation pattern in elevation plane with θ = 50° in right side from the main beam direction with gain 5 dB. This concept helps to reduce the antenna size, cost, and gives more flexibility for a equipment to be operated in different modes. It has advantages of ability to detect target signal, filter out interference signal, and power saving.
Rectangular spiral microstrip patch, PIN diode switch, Frequency and Pattern reconfigurable