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Improved Performance of Microstrip Antenna using the Compact Photonic Band-gap Structures  

Kim Young-Do (Department of Electronics Engineering, Kyonggi Univ.)
Lee Hong-Min (Department of Electronics Engineering, Kyonggi Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.5, 2006 , pp. 147-155 More about this Journal
Abstract
In this paper, we propose a new Mushroom-like PBG concepts for designing with forbidden frequency band-gap at low frequency. These design rules are based on enhancing the capacitance per unit area using modified top-patch of mushroom PBG with no increase on the overall thickness of the substrate board. Also, in this paper, a new approach to suppress the surface wave from antenna is proposed by embedding compact mushroom PBG in the substrate. Comparisons between the results from a conventional patch antenna to a patch antenna on a PBG substrate show that the reduction in the surface wave level is remarkable. This can be observed in the radiation pattern and the maximum gain. The maximum gain for reference patch antenna is $6.43dB{\imath}$ at 5.37 GHz, while the maximum gain for the patch antenna with normal mushroom and vane mushroom PBG is $7.24dB{\imath}\;and\;7.53dB{\imath}$at 5.14 GHz. The back radiation is also considerably reduced; this will lead, of course, to an increase in the antenna efficiency.
Keywords
patch antenna; PBG; Mushroom PBG; stop band;
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