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SUPERCONDUCTIVE TUNABLE FILTER WITH NARROW BAND AND BROAD TUNING RANGE

  • US 3,818,390 A
  • Filed: 04/12/1973
  • Issued: 06/18/1974
  • Est. Priority Date: 04/12/1973
  • Status: Expired due to Term
First Claim
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1. A tunable resonant loop filter comprising:

  • an inductor that includes two cylindrical coaxial coextensive coils connected in series-aiding and providing a predetermined radial clearance between the coils, a cylindrical capacitor coaxial with said inductor and having one element that is axially spaced from and fixedly positioned relative to the inductor and having a unitary second element movable axially relative to the inductor and to the one capacitor element and having a circular conductor portion at one end for telescoping into the clearance between said two coaxial coextensive coils with a snug sliding fit and operable to reduce both capacitance And inductance in one direction of movement and operable to increase both capacitance and inductance in the other direction of movement, conductor means connecting said inductor and said capacitor as a closed loop, means for locating said second element selectively between two limits along the axis of said inductor and capacitor, in one of the two limits the second element being axially spaced from said one element and extending into the entire extent of clearance between the coils, whereby the capacitance between the two capacitor elements is essentially zero and the inductance of the inductor is minimum, in the other of the two limits the second element being axially spaced from the conductor and overlapping the entire axial length of the one capacitor element whereby capacitance between the capacitor elements is maximum and inductance of the inductor is maximum, and a pair of coupling coils substantially shorter than the inductor supported adjacent to and on opposite sides of the inductor with their axes substantially parallel to and coplanar with the inductor axis.

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