Defected ground structure based reconfigurable UWB antenna for iot applications

Abstract

A defected ground structure reconfigurable UWB antenna is developed and presented in this paper. The proposed antenna switches between a narrow band and ultra-wideband. The proposed antenna occupies the compact dimension 37.5x35x1.6mm3. In this design, a pair of ohm shaped slots coupled together by a horizontal slot is considered as defected ground structure. The proposed antenna has the capability of sensing the entire UWB range from 3.1GHz to 10.6GHz and extends up to 15 GHz. Later, a study is performed to understand the switching behavior of the antenna when the switching elements are incorporated in the defected ground structure elements of the proposed antenna and compared with ideal switching case, PIN diode switches. The switching conditions of the proposed antenna yields the frequency reconfigurable nature among the spectrum that covers S-band, C-band and UWB with maximum gain of 2.83dB, 5.12dB and 5.2dB respectively which shows the compatible use in IoT devices.