Meandered H-Shaped Slot-line Quad-Band Frequency Reconfigurable MIMO Antenna

In this paper, we have proposed a miniaturized meandered slot-line based quad-band multiple-input-multiple-output (MIMO) antenna system. The proposed design consists of 2-elements meandered slot-line antenna with an H-shaped configuration. The antenna is made frequency reconfigurable using varactor diode by reactively loading the slot structure. The quad-band antenna design is reconfigurable over all the resonating bands. The meandered slot-line structure with reactive loading resulted in a size reduction of 94% as compared to conventional patch antenna and 36% compared to meandered slot antenna. The proposed antenna design operates in the frequency bands from 0.665-1.13 GHz, 1.415-2.005 GHz, 2.42-3.09 GHz and 3.18-3.89 GHz bands, thus covering most of the modern communication standards. The proposed 2-element design is fabricated on a substrate board of dimensions 60×120×0.76 mm
³
using an RO4350 substrate. The proposed design is well-suited for wireless handheld devices to be used in the second generation cognitive radio (CR) front end applications.