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Tuning systems on dielectric substrates

  • US 4,619,001 A
  • Filed: 08/01/1984
  • Issued: 10/21/1986
  • Est. Priority Date: 08/02/1983
  • Status: Expired due to Term
First Claim
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1. A tuning system comprising:

  • a dielectric;

    a pair of first and second electrodes confronting each other with said dielectric interposed therebetween, each of said first and second electrodes having at least one bent portion to present primarily a lumped-constant inductance and having a desired equivalent electrical length;

    said first and second electrodes having ground or common terminals located out of mutually confronting positions so that voltage signals induced by mutual induction between the electrodes will be opposite in phase with respect to each other, thereby producing a parasitic distributed-constant capacitance due to a potential difference between the electrodes and a dielectric constant of the dielectric;

    one of said first and second electrodes having a first terminal at a desired position thereof, the electrodes forming a two-terminal circuit network having the first terminal with the ground or common terminals serving as a second terminal, the two-terminal circuit network forming an equivalent parallel resonant circuit composed of a lumped-constant inductance formed by said one electrode and a parasitic distributed-constant capacitance between the first and second electrodes; and

    a feedback amplifier connected at its feedback terminal to said first terminal of said equivalent parallel resonant circuit for generating an inherent voltage vibration to produce a tuning oscillating signal.

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