Design and Evaluation of a T-Shaped Adaptive Impedance Matching System for Vehicular Power Line Communication

Abstract

The quality of the communication links in VPLC (vehicular power line communication) suffer from an impedance mismatch resulting from fluctuating VPLN (Vehicular Power Line Network) access impedance, which renders the fixed impedance matching circuit inefficient. In this paper, we designed a T-shaped adaptive impedance matching system on the basis of the resonance-and absorption-based T-shaped network complex impedance matching approach. We identified the load-Q (quality factor) for different matching situations to facilitate designing T-shaped networks with broad bandwidths. The designed T-shaped adaptive impedance matching system adjusts the component values of the T-shaped network to implement adaptive impedance matching between the VPLC modem and VPLN. A set of simulations are conducted for 1 MHz-100 MHz, which demonstrates that the designed adaptive matching system with a simple circuit structure and control logic is capable of significantly improving signal power transfer.INDEX TERMS Impedance matching, maximum power transfer, T-shaped network, resonance and absorption.

Impedance Matching Network of Passive Coupler with Coaxial Cable for Airborne Sonar Applications

“…The inclusion of reactive components, such as capacitors and inductors of the coupler and de-coupler circuits, introduces additional impedance mismatch in the network. Therefore, it is essential to compensate for the imbalances caused by (i) the long cable, (ii) the AC coupler, (iii) the DC coupler, and (iv) the data coupler by designing a suitable impedance-matching network [18,19].…”

Optimum power transfer in RF front end systems using adaptive impedance matching technique

“… Refs. Methodology Impedance Type Structure Implementation Bandwidth Convergence time Notes 2 Numerical Insertion loss Flexible Combination Narrow 0.15 s Complex control system, automated tuning, simple analogue components, complex mathematical modeling 4 Analytical Single Flexible Combination Wide 4.25 s alleviated method, linear control components, simple analogue components, automated tuning 15 Numerical Single Fixed Passive Narrow NR Complex mathematical modeling, alleviated method, complex control system 16 Numerical Single Fixed Passive Narrow 4 s Transformers used, complex control system, expensive transformers, nonlinear control components 17 Analytical Insertion loss Fixed Combination Narrow NR Complex control system, nonlinear control components, transformers used 18 Analytical Insertion loss Fixed Passive NR <...>…”

“…Recent works reported in literature on adaptive impedance-matching include: (i) a T-shaped adaptive impedance matching system that refers to predetermined load-Q information for different matching conditions to implement the impedance matching 15 . The T-shaped network uses tuneable capacitors that are controlled by digital relays.…”

Impedance matching design of magnetically coupled resonant wireless power transmission based on class E power amplifier

“…Let point A1 to point A4 are the corresponding points of impedance value before matching, and point B1 to point B4 are distributed in the impedance circle and conductance circle where normalized impedance and normalized conductance are all 1. Matching principle is from each point A for series, parallel passive devices to the corresponding point B, and then from point B along the normalized impedance or conductance circle series, parallel passive devices to the center of the circle to complete the matching point C. Therefore, according to the point A to move to the point C path can be introduced by the combination of permutations there are a total of four kinds of matching combinations form shown in Figure3[9] . Considering the common use of parallel capacitor grounding in reality to prevent sudden voltage changes and other situations, for this paper, Fig.6(a) and (b) are chosen as the matching network structure, and its corresponding Smith circle diagram is shown in Fig.…”