Abstract

Abstract — This paper is reported the design of a novel Compact frequency Reconfigurable Antenna with using Defected Ground structure (DGS). The bandwidth of the proposed antenna is increased by using DGS. The resonances frequency of the proposed antenna can be reconfigured into four different modes. The designed antenna is able to cover the frequency band 3-22 GHz, and perform the operation of removal frequency band in different modes. Changing the mode of antenna is done by three pin diode switches that are located in ground plane. I. I NTRODUCTION Nowadays, microstrip antennas according to their particular physical and electromagnetic properties, such as compression, using multiple frequency bands, effortless design and manufacture, more economical and it is appropriate that these antenna be used in integrated circuits, in comparison with other antennas they have more advantageous to be used instead. The growth of communication networks and the requirement of various services are the reasons for using bandwidth more than before. UWB systems due to their ability to providing high bit rate and low power consumption were considered as a desirable option for wireless communications. Several designs on UWB antennas have been reported [1]-[9]. Make use of Defected Ground Structure (DGS) is one method of increasing bandwidth in microstrip antennas. DGS structures are created by a simple shape defect in the ground plane. Distribution of the circuit, which has covered the ground plane, is impaired by this defect and thus, it obtains in consequence of a controlled excitation and propagation electromagnetic waves in dielectric layer. Here, we use a simple DGS with a circular slot to increase bandwidth antenna. According to Simulation results the designed antenna is able to cover the frequency band of 3-22 GHz. and perform the operation of removal frequency band in different situations. In this paper, a new microstrip slot antenna with the ability of removal of frequency band of C, X, Ku and improved bandwidth for UWB applications is presented. With placing the switch on circular slot of ground plane and parasitic ground plane which is located behind the antenna, the process of removal of frequency band is done. II. A

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