An Adaptive Impedance Matching System
نویسندگان
چکیده
An adaptive impedance matching system is proposed. This system employs only a simple algorithm for convergence, therefore does not need any complicated mathematical formulation for modeling of the system itself as well as its nonlinear control elements. Also the proposed system utilizes only simple digital circuits for timing generation and basic analog circuits. In addition to that, the appropriate range of the control elements (varactors) is investigated. With a parametric simulation, appropriate range of the capacitance for the varactors, which can make the reflection coefficient between the antenna and RF front end considerably small while the antenna impedance fluctuates. Furthermore, a method is proposed, which makes it possible to use the commercially available varactors to realize the suitable range of the capacitance for the varactors. As a result, the improvement in the mismatch is observed by 4dB or more over an impedance matching circuit with fixed capacitances.
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تاریخ انتشار 2004