A Notch Filter-Based Coupling Circuit for UNB and NB PLC Systems

• Published in: Sensors (Basel, Switzerland) Vol. 22; no. 24; p. 9722
• Main Authors: da Silva Costa, Luís Guilherme, Cantarino, Wesley Mateus, Camponogara, Ândrei, Ferreira, André Augusto, Ribeiro, Moisés Vidal
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 12.12.2022; MDPI
• Subjects: Analog circuits; Analogue filters; Attenuation; Automatic meter reading; Bandwidths; Circuits; Communication; Communications systems; Computer Systems; coupling circuit; Coupling circuits; Data communication; Electric filters; Electric power; Electric power grids; Electric power systems; Electricity; Electricity distribution; Electrodes; Internet of Things; Low pass filters; Narrowband; notch filter; Notch filters; power line communication; Power lines; ultra-narrowband; coupling circuit; power line communication; ultra-narrowband; narrowband; notch filter
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s22249722

This paper introduces an analog notch filtering-based coupling circuit for receivers in ultra-narrowband and narrowband power line communication systems, which are connected to low-voltage electric power grids. It is composed of a twin-T notch analog filter, which is responsible for imposing a significant attenuation on the main frequency (i.e., f0∈{50,60} Hz) in cascade with an elliptic low-pass analog filter, designed with a 3 dB cut-off frequency of fc≫f0. For f0=60 Hz and fc=2 MHz, the prototype of the analog notch filtering-based coupling circuit attains attenuation values of 22 dB and less than 2 dB at the main frequency and in the rest of the frequency bandwidth, respectively, when practical scenarios are considered. Lastly, it shows that the analog notch filtering-based coupling circuit is more effective than a typical capacitive coupling circuit when frequencies lower than 3 kHz are considered for data communication and sensing purposes.