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DVB-T reception test with ultra miniature CPW antenna

DVB-T reception test with ultra miniature CPW antenna,B. Jannier,M. A. C. Niamien,A. Sharaiha,S. Collardey

DVB-T reception test with ultra miniature CPW antenna   (Citations: 1)
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An ultra miniature coplanar waveguide (CPW)-fed antenna has been designed for digital video broadcasting- terrestrial (DVB-T) signals reception around 474 MHz on channel 21 in France. Despite the very compact footprint of the antenna, its exhibits a relatively high realized gain of -0.5 dB which provides good receiving TV-signals in terms of image and sound quality with a bit error rate (BER) smaller than 1.0e-7. I. INTRODUCTION The good old UHF analogical television broadcasting is being replaced with digital transmissions through the DVB-T standard. Concurrently the DVB-H standard adapted for handheld devices is developing across Europe along with commercial services aiming at providing mobile television. Since this standard is destined to handheld devices, the antennas have to remain compact and yet provide sufficient gain and close to omni-directional radiation pattern to ensure a good quality of reception. In this context, the authors work is aiming at designing a miniature antenna integrated on a large- size tablet board, working in the low UHF band (474 MHz) and usable for the reception of a DVB-H signals. Since no DVB-H signals are broadcasting in France yet, the tests were performed on DVB-T signals. As a matter of fact, the UHF IV band is shared with the DVB-H standard. In order to face the challenge of building a miniature antenna working in the UHF IV band, our approach consisted in combining classical miniaturization techniques like short- circuiting, meandering the radiating elements (1) with the use of a magneto-dielectric material (2). These methods were applied on a PIFA uniplanar antenna. The resulting antenna is shown in Fig. 1. The radiating element is a 1 mm-thick strip which is meandered on one end according to a spiral shape. The other end is connected to the ground. The length of the meandered strip is tuned so that the 474 MHz- allocated to the channel 21 (DVB-T) in the area where the bandwidth of the antenna. The position of the CPW feed line, which defines the length of the shorted strip, tunes the antenna impedance. The overall area occupied by the antenna is 16.4x16.4 mm 2 in the corner of the ground printed over a 0.81 mm-thick FR4 epoxy substrate. A 15x15x3mm 3
Published in 2011.
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