Acoplador capacitivo integrado a um equalizador de amplitude e amplificador de RF para sistemas PLC

Abstract

This work presents the development, implementation, and experimental validation of a capacitive coupling circuit for power line communication (PLC) systems operating in the 1, 7-100 MHz frequency range. The circuit integrates high-pass and low-pass filters using a reflectionless topology, a pre-distortion filter to compensate for the frequency- selective attenuation of the power grid, and a radio-frequency amplifier. The components were designed, assembled, and tested both individually and as a complete system, with measurements carried out using a vector network analyzer. The experimental results demonstrated low insertion loss and good impedance matching, confirming the effective- ness of the reflectionless topology and the contribution of the equalization and amplifi- cation stages to the couplers performance. Simulations showed good agreement with the experimental results, validating the proposed model and its applicability in PLC commu- nication.