Adjustable filter with stable wide stop band
A wide stopband and filter technology, applied in the field of radio frequency communication, can solve the problems of the upper stopband is not stable enough, not taken into account, unable to meet the diverse wireless communication needs, etc., to achieve stopband stability, widen the frequency tuning range, The effect of optimizing characteristic parameters
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[0031] An embodiment of the present invention provides a tunable filter with a stable wide stopband, see figure 1 , the adjustable filter includes a first interface 11, a second interface 12, a first feeder 13, a second feeder 14, a first varactor C loaded with v11 The first step impedance resonator 15, loaded with the second varactor C v12 The second step impedance resonator 16 , the third varactor C connecting the first step impedance resonator 15 and the first feeder 13 v21 , the fourth varactor C connecting the second step impedance resonator 16 and the second feeder 14 v22 ;
[0032] The first interface 11 and the second interface 12 are arranged symmetrically, and the first interface 11 is located at one end of the first feeder 13, and the second interface 12 is located at one end of the second feeder 14;
[0033] The first feeder 13 and the second feeder 14 are coupled and arranged symmetrically, and the other end of the first feeder 13 is set at the voltage zero poi...
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