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

Abstract

The allocation of part of the UHF band to 4G and 5G services has generated the appearance of channel interferences over the digital terrestrial television frequency band. In order to reduce these interferences, this work presents a novel and efficient band-stop filter implemented using microstrip technology. The filter, designed with rectangular split-ring resonators etched in the ground plane, provides a cutoff frequency above channel 48 (694 MHz), a high roll-off rate of 44 dB in 56 MHz and a rejection bandwidth of 250 MHz that covers the upper UHF band occupied by 4G and 5G with rejection levels close to 35 dB. The filter is manufactured entirely over a printed circuit board without lumped elements to reduce production costs, fine tuning after the assembly stage and maintenance. Moreover, it presents a compact subwavelength size of only 0.07 λ × 0.17 λ to facilitate installation, whether at the input of the TV terminal or integrated with the balun at the rooftop antenna.

Co-Channel Compatibility Analysis of IMT Networks and Digital Terrestrial Television Broadcasting in the Frequency Range 470–694 MHz Based on Monte Carlo Simulation

“…Laboratory experiments in refs. [30][31][32][33] confirmed the effectiveness of low-pass filters in reducing IMT interference in digital TV channels. Ref.…”

Adjacent-Channel Compatibility Analysis of International Mobile Telecommunications Downlink and Digital Terrestrial Television Broadcasting Reception in the 470–694 MHz Frequency Band Using Monte Carlo Simulation

“…The findings provided insights for optimizing LTE network configurations in the future. A notable contribution in [24][25][26][27] is the introduction of an innovative band-stop filter designed to enable DTTB reception in the presence of LTE interference. Laboratory tests conducted on these filters demonstrated strong alignment with simulations.…”