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Design of Electromagnetically Coupled Small Broadband Monopole Antenna with Vertical Ground Plane  

Kim Myung-Bum (School of Electrical and Computer Engineering, Ajou University)
Jung Jong-Ho (School of Electrical and Computer Engineering, Ajou University)
Choo Hosung (School of Electronic and Electrical Engineering, Hongik University)
Park Ikmo (School of Electrical and Computer Engineering, Ajou University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.6, 2005 , pp. 632-643 More about this Journal
Abstract
This paper presents a folded stripline-fed small broadband disk-loaded monopole antenna with vertical ground plane. The bandwidth of the proposed antenna can be enhanced by electromagnetic coupling between the shorted rectangular disk and the probe with folded strip line. The measured impedance bandwidth of the proposed antenna is $37.6\%$ for $VSWR\leq2$ with the center frequency at 2.313 GHz and has the physical dimensions of only $11mm\times11mm\times11mm$ which corresponds to the electrical length of $0.085\lambda_0\times0.085\lambda_0\times0.085\lambda_0$. For improving the radiation pattern characteristics, rectangular slits are inserted in the vertical ground plane. Rectangular slits affect the currents distribution on the ground plane, so that the antenna radiation in the direction of the ground plane is reduced more than 3 dBi. Gain of the antenna is approximately 2.6 dBi within the bandwidth.
Keywords
Electromagnetically Coupled Antenna; Electrically Small Antenna; Monopole Antenna; Radiation Pattern;
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