Abstract
Based on the Gaussian Filter Model (GFM), an equivalent circuit model that considers the effect of a finite-sized ground plane is presented to estimate the impedance bandwidth of typical printed monopole antenna geometry. The ground-plane is commonly regarded as a low impedance path for returning currents with constant potential across its area. In fact, the finite-size ground-plane of a PCB (Printed circuit board) is not a perfect-ground, it has significant reactance. Therefore, the result of printed ground-plane versus monopole antenna should be regarded as an additional planar radiator rather than a normal ground-plane. The quantitative values of inductance and capacitance of the printed monopole antenna with coplanar ground-plane are addressed thoroughly in this paper. Measured and Ansoft HFSS simulation results are presented to confirm the results obtained using GFM.
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