Stepwise regulated filter having a multiple-step switch

Details Stepwise regulated filter having a multiple-step switch Stepwise regulated filter having a multiple-step switch

1996-08-22

1998-08-11

Lee, Benny

Wave transmission lines and networks

Resonators

With tuning

333203, 333223, H01P 700, H01P 1205, H01P 704

Patent

active

057932697

ABSTRACT:
A stepwise regulated filter includes a resonator structure and a coupling connected to the resonator structure. The resonating frequency of a transmission line (HX1) acting as a resonator may be switched between at least three values. The switching is implemented using coupling elements (SL1, SL4) which are in an electromagnetic coupling (M2, M3) with the resonator (HX1). The potentials of the coupling elements (SL1, SL4) are affected by PIN diodes (D1, D2) acting as switches. A RF power signal, which is coupled from the resonator (HX1) to the coupling elements (SL1, SL4), is applied to both terminals of at least one diode (D1) with the same phase and power. Then the voltage across the diode (D1) cannot, in the blocking state, rise to a level that would cause undesirable mixing results or would damage the diode (D1).

REFERENCES:
patent: 4502029 (1985-02-01), Reed
patent: 5107233 (1992-04-01), Stoft
patent: 5298873 (1994-03-01), Ala-Kojola
patent: 5594395 (1997-01-01), Niiranen

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