Abstract
The coexistence of TV broadcasting and mobile services causes interference that leads to poor quality-of-service for TV consumers. Solutions usually found in the market involve external band-stop filters along with TV reception log-periodic and Yagi-Uda antennas. This paper presents a log-periodic antenna design without additional filtering that serves as a lower cost alternative to avoid interference from mobile services into the UHF TV. The proposed antenna operates in the UHF TV band (470–790 MHz-passband) and rejects the 800 MHz and 900 MHz bands (stopband) of 4G/LTE-800 and GSM900 services, respectively. Matching to 50 Ohms is very satisfactory in the passband with values of S11 below −12 dB. Furthermore, the antenna is highly directive with a realized gain of approximately 8 dBi and a front-to-back ratio greater than 20 dB.
Highlights
The adoption of digital modulation and advanced video compression techniques for terrestrial TV broadcasting, replacing analog broadcasting, resulted in considerable improvements in the efficiency of frequency spectrum utilization, making it possible to broadcast several TV programs in multiplex in a single 8 MHz TV channel
Broadcasting, replacing analog broadcasting, resulted in considerable improvements in the efficiency of frequency spectrum utilization, making it possible to broadcast several TV programs in multiplex in a single 8 MHz TV channel. This transition set a part of the TV spectrum free for utilization for other applications, and the wireless communications industry saw this transition as an opportunity to use the released frequency spectrum for mobile communication services
A useful study performed in [4] investigates the other hand, DTT (Digital Terrestrial Television) is allocated the 470 MHz to 790 MHz band and that just effects of interference on the degradation of the QoS in the TV broadcasting band leaves a 1 MHz-wide frequency gap between DTT broadcasting and LTE-800 mobile communications
Summary
The adoption of digital modulation and advanced video compression techniques for terrestrial TV broadcasting, replacing analog broadcasting, resulted in considerable improvements in the efficiency of frequency spectrum utilization, making it possible to broadcast several TV programs in multiplex in a single 8 MHz TV channel. The EC decision described in [3] suggests a harmonized plan that was adopted by European states (ITU Region 1) for LTE network deployment in the 800 MHz band This band is important for the mobile communications industry because of its relatively low building material penetration radio losses and the fact that most of the time mobile phones are used indoors. A useful study performed in [4] investigates the other hand, DTT (Digital Terrestrial Television) is allocated the 470 MHz to 790 MHz band and that just effects of interference on the degradation of the QoS (quality-of-service) in the TV broadcasting band leaves a 1 MHz-wide frequency gap between DTT broadcasting and LTE-800 mobile communications. Realized gain (RG) along with a higher FBR (front-to-back ratio) throughout the DTT reception passband
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