Resonant circuit with variable frequency and impedance

摘要

A resonant circuit comprises an input terminal and an output terminal and at least: a group of N resonators, where N≧1, the resonators having the same resonance frequency and the same antiresonance frequency; a first and a second impedance matching element having a non-zero reactance, the first element being in series with the group of resonators, and the second element being in parallel with the group of resonators, the resonant circuit comprising: first means for controlling the group of resonators, enabling the static capacitance of the group to be fixed at a first value; second control means, enabling the impedance of the first impedance matching element and that of the second element to be fixed at second values; the first and second values being such that the triplet of values composed of the static capacitance of the group, the impedance of the first element, and the impedance of the second element can be used to determine the following triplet of parameters: the characteristic impedance Zc of the assembly formed by the group, the first impedance matching element and the second matching element; the resonance frequency ωr of the assembly; the antiresonance frequency ωa of the assembly, in order to stabilize the impedance of the circuit at a chosen characteristic impedance.

主权项

1. A resonant circuit with a characteristic impedance stabilized at a chosen value, comprising an input terminal and an output terminal, and at least:
a group of N resonators, where N≧1, said resonators having the same resonance frequency and the same antiresonance frequency; a first impedance matching element and a second impedance matching element having a non-zero reactance, the first impedance matching element being in series with said group of N resonators, and the second impedance matching element being in parallel with said group of N resonators, said resonant circuit comprising: first means for controlling said group of resonators, enabling the static capacitance of said group to be fixed at a first value; second control means, enabling the impedance of the first impedance matching element and that of the second impedance matching element to be fixed at second values; said first and second values being such that: the triplet of values composed of the static capacitance of said group, the impedance of the first impedance matching element, and the impedance of the second impedance matching element can be used to determine the following triplet of parameters:
the characteristic impedance Zc of the assembly formed by said group, said first impedance matching element and said second matching element;the resonance frequency ωr of said assembly formed by said group, said first impedance matching element and said second matching element;the antiresonance frequency ωa of said assembly formed by said group, said first impedance matching element and said second matching element, in order to stabilize the impedance of said circuit at a chosen characteristic impedance.