WIDE-BANDWIDTH AND FLAT-GAIN PRINTED DIPOLE WITH EBG REFLECTOR FOR TERRESTRIAL DTV RECEPTION
Keywords:
Digital television (DTV), step-shaped printed dipole, mushroom-like EBGAbstract
This paper reports the design of a compact high-gain broadband printed dipole antenna for receiving digital television (DTV) signals from any broadcast station in remote areas of Thailand with the frequency bandwidth of 470 MHz - 862 MHz. The proposed antenna consists of a modified step-shaped printed dipole antenna, to which the band-notch technique is applied by adding 8 small slots on the inner edge of the long side arm for bandwidth enlargement up to 7.65% compared to the conventional one, while the directive gain of the antenna is increased up to around 8 dBi over the frequency bandwidth by using a mushroom-like EBG reflector, which can suppress the surface wave on the surface and wave diffraction on the edges of such a reflector. In order to validate the simulation results from CST licensed software, the prototype antenna was fabricated and measured in the laboratory. We found that the proposed antenna can provide a high gain around 7 - 8 dBi over the desired bandwidth. Moreover, the radiation patterns over the bandwidth of the antenna are a little bit changed in the front direction.
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