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Means for tuning a loaded coil antenna

  • US 4,080,604 A
  • Filed: 09/21/1976
  • Issued: 03/21/1978
  • Est. Priority Date: 09/21/1976
  • Status: Expired due to Term
First Claim
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1. A tunable antenna loading apparatus, comprising:

  • a loading coil having an antenna connection means adjacent one end thereof and a ground connection means adjacent the other end thereof and a feed connection means intermediate said antenna connection means and ground connection means, said loading coil being fixedly supported with respect to said antenna connection means and ground connection means, said loading coil comprising a multiple turn conductor;

    a conductive member close spaced from said coil and having at least a portion arranged to face at least a portion of said coil, such that said conductive member and said coil simulate the opposed plates of a capacitor, said conductive member being electrically connected to said ground connecting means;

    dielectric means interposed between said coil and conductive member to act as a dielectric of a capacitor, said conductive member being adjustably movable with respect to said coil to vary the distributive capacitance supplied by the relationship of said coil and conductive member and with the inductance of said coil to adjust the resonant frequency of the antenna apparatus;

    a conductive ground strip electrically conneced to said ground connecting means adjacent said other end of said coil and extending lengthwise along said coil toward said one coil end and being electrically insulated from said coil by said dielectric means, said conductive member being in electrical contact with said ground strip, said conductive member comprising a conductive vane pivotally fixed on said ground strip in radial opposition to said coil for pivotal movement into and out of capacitance relation with sets of turns of said coil.

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