Investigation of a defected ground structure inspired wideband printed monopole mobile antenna using characteristics mode analysis

Abstract

In this research article, a wideband mobile antenna with defected ground structure (DGS) is designed using characteristics mode analysis. It consists of a modified crescent-shaped monopole antenna (M-mode), L-shaped stub (S-mode), and DGS element (slot modes). Here, the fundamental resonating modes of M-and S-mode are induced to operate in the integration mode (I-mode) to obtain good impedance bandwidth (IBW). The DGS is implemented in ground plane to get slot modes (1 and 2). By combining slot modes with M-mode and S-mode, it exhibits broadened IBW (i.e., C-mode), is suitable for the coverage of mobile bands (sub-6 GHz frequency bands). For the clarity, modal investigation is performed at each critical stages of antenna designing process and the modal metrics like modal significance, characteristics angle (β n ), Eigen values (λ n ), modal currents, and modal patterns are extracted by using Computer Simulation Technology (CST) Studio Suite. The

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“…DGS antenna structures are increasing in popularity among engineers and academics day by day 9,10 . DGS antennas are modified on the ground plane of the patch antenna to obtain higher antenna performance 11,12 .…”