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PIERS Online
Vol. 4
No. 2
2008
pp: 157-160Printed Digital Audio Broadcast AntennasThe-Nan Chang and Cheng-Min Jen doi:10.2529/PIERS070701020355 Downloads: 797 Abstract:In this paper, printed antennas were studied for digital broadcast reception. The first one is a meandered loop antenna. Being in a meandered form, it can be made very compact. However, the gain and efficiency are quite low. In our study, the measured gain is only -30 dBi. Aside from low gain, the bandwidth is also narrow. Therefore, this configuration may not be practical in use.We then studied a bow-tie antenna. Bow-tie antenna is typically considered to have more band-width than the meandered configuration. Its gain increases up to 1.85 dBi. Measured bandwidth is around 8%. For DAB reception in upper half of Band III, a required bandwidth of 13% is needed. We found that the bandwidth can be increased by half-sizing the bow-tie antenna without reducing too much of its gain. This half sized bow-tie antenna (HBTA) takes an area of 475 mm by 110 mm. Measured 10 db return loss bandwidth ranges from 192 to 236 MHz, or 21% bandwidth centered at 214 MHz. The gain is 1.78 dBi within the whole band. References:1. Chang, T.-N. and C.-C. Kuo, "Meander antenna with backside tuning stubs," IEEE Transactions on Antennas and Propagation, Vol. 53, No. 4, April, 2005. |
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