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http://dx.doi.org/10.5515/KJKIEES.2012.23.3.306

Isolation Enhancement between Two Dual-Band Microstrip Patch Antennas Using EBG Structure without Common Ground Plane  

Choi, Won-Sang (Department of Electronic Engineering, Kyonggi University)
Lee, Hong-Min (Department of Electronic Engineering, Kyonggi University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.23, no.3, 2012 , pp. 306-313 More about this Journal
Abstract
In order to enhance the isolation level between two dual-band E-slot microstrip patch antennas, EBG structure which operates in UMTS Tx(1.92~1.98 GHz) and Rx(2.11~2.17 GHz) band is proposed. The proposed EBG structure made with a periodic array of two different size EBG unit cells which has a modified mushroom-type for isolation improvement between two antennas. They do not share a common ground plane of the microstrip patch antenna. Overall size of the fabricated antenna is $210.5mm{\times}117mm$. The two different EBG unit cell sizes are $15.6mm{\times}4mm$ and $17.4mm{\times}4mm$, respectively. It was etched on the FR-4 substrate(thickness=3.93 mm, ${\varepsilon}_r$=4.6). The experiment results show that the isolation level between antennas in Tx/Rx band were improved by about 9 dB and 12 dB, respectively, through the use of the proposed EBG structure.
Keywords
EBG; Isolation; Microstrip Antenna; Dual-Band; Soft-Surface;
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