Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1996-03-22
1998-03-31
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333219, 333235, 333175, H01P 120
Patent
active
057343055
ABSTRACT:
The invention relates to a resonator structure and radio frequency filter in which the resonating frequency of a transmission line resonator can be switched in a stepwise manner between at least three values. The switching is implemented as follows: a regulating element including a switch that has at least three states is arranged in connection with the resonator. The three states of the switch correspond to different values of the specific impedance and, hence, the resonating frequency of the transmission line resonator. The regulating element is in accordance with a known arrangement: it may be e.g. a coupling element formed of a strip line on the surface of a low-loss substrate or ceramic, or a side circuit including a capacitive and inductive element, coupled to the resonator. In the former example the switch is open in its first state, in its second state it grounds one end of the coupling element directly and in its other states it grounds the end of the coupling element through differently dimensioned transmission lines. In the latter implementation the switch is open in its first state, in its second state it forms at the side circuit a capacitive-inductive coupling in series and in its third state it bypasses the inductive element.
REFERENCES:
patent: 4353038 (1982-10-01), Rose et al.
patent: 4660002 (1987-04-01), Iijima et al.
patent: 5298873 (1994-03-01), Ala-Kojola
patent: 5543764 (1996-08-01), Turunen
Gambino Darius
LK-Products OY
Pascal Robert
LandOfFree
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