Optimization of Log-Periodic TV Reception Antenna with UHF Mobile Communications Band Rejection

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.

Miniaturized Wideband Loop Antenna Using a Multiple Half-Circular-Ring-Based Loop Structure and Horizontal Slits for Terrestrial DTV and UHD TV Applications

“…Antenna types commonly used for indoor terrestrial DTV reception include loop, dipole, monopole, log-periodic dipole array (LPDA), and quasi-Yagi antennas [ 5 ]. The quasi-Yagi and LPDA antennas have high gain from using multiple dipoles, but it is necessary to check the receiving direction and adjust the location because of directivity [ 6 , 7 , 8 , 9 ]. On the other hand, the omni-directional dipole, monopole, and loop antennas can receive from all directions, but have low gain [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ].…”

“…The size of the Yagi-Uda antenna was 226 mm × 206 mm, whereas that of the LPDA antenna was 283 mm × 248 mm. An LPDA DTV reception antenna with UHF mobile communications band rejection capability was proposed [ 9 ]. Ten dipole elements were used, and the lengths of the front short three dipoles and their spacing were optimized by using the trusted region framework algorithm in CST Microwave Studio in order to obtain rejection in the frequency range of 810–960 MHz.…”

Investigation of Broadband Printed Biconical Antenna with Tapered Balun for EMC Measurements

“…The antennas used for the EMC test should have specific characteristics such as wide bandwidth, high gain, omnidirectional radiation pattern, and good antenna factor. These designed antennas are intended to work in the very high frequency (VHF) and ultra-high frequency (UHF) bands (30-1000 MHz and 1000-3000 MHz, respectively) [8], to detect the interference emitted from the most critical applications in these bands such as GSM (850-900 MHz), LTE (1800 MHz), UMTS or 3G (2100 MHz), Wi-fi, Bluetooth, Zigbee and more (2400 MHz) [9,10]. VHF Telecommunications Standards Institute (ETSI).…”

Compact Low-Cost Filter for 5G Interference Reduction in UHF Broadcasting Band

“…A third option to solve this problem is filtering the LTE interferences. This filtering can be done at the antenna, properly designed with a bandwidth limited to the DTT bandwidth [24,26]. This is a good solution for new installations.…”