This paper aims to analyze how the characteristics of passive components impact the design of power line communication (PLC) coupling circuits for broadband applications. Based on measurement results from the Impedance Analyzer E4491A, we show that plated through-hole and surface mount device components present distinct behaviors in the higher frequencies. Consequently, we point out that the implementation type of passive components is essential when the design has to result in impedance matching and flat frequency response for minimizing distortions in the coupling process in high frequencies.
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.
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