Title :
An adaptive impedance matching system for mobile communication antennas
Author :
Ida, Lchirou ; Takada, Lun-ichi ; Toda, Takcshi ; Oishi, Yasuyuki
Author_Institution :
Tokyo Inst. of Technol., Japan
Abstract :
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 the system itself and its nonlinear control elements. Also, the proposed system utilizes only simple digital circuits, for timing generation, and basic analog circuits. Even with a small range of capacitance for the control element in the matching circuit, there is an improvement in the mismatch by 2-3 dB over an impedance matching circuit with fixed capacitances.
Keywords :
adaptive control; antenna feeds; capacitance; impedance matching; mobile antennas; mobile radio; telecommunication control; varactors; adaptive control; adaptive impedance matching system; analog circuits; capacitance; digital circuits; matching circuit; mobile communication antennas; nonlinear control elements; timing generation; Adaptive arrays; Adaptive systems; Capacitance; Circuits; Convergence; Impedance matching; Mathematical model; Mobile antennas; Mobile communication; Nonlinear control systems;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1332060
