Abstract
In this article, elliptical and inverted-L slot antennas are integrated at same substrate to achieve 4G and 5G applications. The proposed antenna consists of elliptical and inverted-L slot on ground plane. A varactor diode (SMV1233) is loaded on elliptical slot to achieve frequency tunability in dual band from 1.89 GHz to 2.65 GHz for lower band and 5.27–5.6 GHz for higher band (4G, WLAN) with maximum gain of 4.55dBi. A L-shape slot is excited by inverted-L-shape monopole antenna for 5G applications with bandwidth 3.26–3.75Ghz. To increase the functionality, an elliptical slot loaded with varactor diode is easily extended into four port and L-shape slot also easily extended in two port for multiple input and multiple output (MIMO) applications. The six elements are implemented on Rogers substrate with size of 120 * 60 * 0.76 mm3. Due to integration of 4G and 5G operation on slots, the proposed antenna structure is compact, simple in structure. Proposed elliptical frequency reconfigurable MIMO antenna is designed for wireless handheld devices and mobile terminals in cognitive radio applications.
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