Variable inductive resonant circuit arrangement having a diamagnetic core for the UHF range

• US 3,899,758 A
• Filed: 05/01/1974
• Issued: 08/12/1975
• Est. Priority Date: 05/01/1974
• Status: Expired due to Term

• Current Assignee: Bertram Fischer, Gerhard Maier
• Original Assignee: Bertram Fischer, Gerhard Maier
• Inventors: Fischer, Bertram, Maier, Gerhard
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Punter, Wm. H.
• Application Number:
  US05/465,859
• Time in Patent Office: 468 Days
• Field of Search: 334/15,41-45,74-77,65,70,89 333/7S,73R,73S,76,82R,82A 336/200
• US Class Current: 333/185
• CPC Class Codes: H03H 5/003 comprising distributed impedance elements together with lumped impedance elements

Abstract

This invention relates to a variable, predominantly inductive resonant circuit arrangement for the ultra high frequency (UHF) range, in particular for transistorized UHF television tuners, that are tuned with varactor dividers, whereby at least two such resonant circuit arrangements are employed per receiver and take the form of a printed circuit with a coil arrangement of less than one turn.

Claims

1. A variable, predominately inductive resonant circuit assembly for the UHF range of a transistorized UHF television employing varactor tuners comprising:

a threaded member of insulating material disposed within an aperture of a printed circuit board;

an arcuate conductor strip having apertures surrounding the extreme periphery thereof and having less than one turn surrounding and affixed to said threaded member of insulating material;

a core of diamagnetic material disposed within said threaded member of insulating material, said core including means for adjustment; and

varactor diode means coupling said arcuate conductor strip to a potential reference level.

2. A variable, predominately inductive resonant circuit assembly for the UHF range of a transistorized UHF television employing varactor tuners comprising:

a threaded member of insulating material disposed within an aperture of a printed circuit board;

an arcuate conductor strip having less than one turn surrounding and affixed to said threaded member of insulating material, said arcuate conductor strip having hot and cold ends with an aperture in the base material intermediate said hot and cold ends;

a core of diamagnetic material disposed within said threaded member of insulating material, said core including means for adjustment; and

varactor diode means coupling said arcuate conductor strip to a potential reference level.

3. A variable, predominately inductive resonant circuit assembly for a UHF range, in particular transistorized UHF television tuners, that are tuned with varactor diodes, whereby at least two of said resonant circuit assemblies are employed per receiver and take the form of a printed circuit with less than one turn, characterized by the fact that the assembly consists of a flat, circular loop on the printed tuner circuit and therewithin, in a round hole in the circuit board, a threaded member of insulating material, provided with a diamagnetic core and thaT the dimensions thereof are determined by the following equations, known per se, proceeding from the formula for a capacitor-loaded, quarter-wave cavity resonator and the relative length