Loop antenna arrangements for inclusion in a television receiver
First Claim
1. An antenna arrangement for inclusion within a cabinet of a receiver including a tuner and operable over selected frequency bands comprising:
- a loop of electrically conductive material, having at least one gap, said gap forming respective first and second feed terminals, said loop having at least one neutral point thereon at which a potential equal to the average of potentials at said first and second feed terminals is developed when electromagnetic radiation impinges upon said loop;
circuit means having input and common terminals for receiving an input signal therebetween, and having an output terminal for supplying an output signal responsive to said input signal, said circuit means being located proximate to said gap and includingmeans for respectively coupling said input and common terminals to the first and second feed terminals of said gap,tuning circuitry connected between said input and common terminals for tuning said loop over at least a portion of said selected frequency bands, andmeans for coupling signals from said tuning circuitry to said output terminal, said signal coupling means isolating said tuning circuitry for making said tuning circuitry substantially unaffected by an impedance at said output terminal; and
a transmission line having a conductor connected to said output terminal for receiving said output signal and for coupling said output signal to said tuner, said transmission line conductor being disposed along the periphery of said loop between said output terminal and said neutral point and departing from said loop proximate to said neutral point.
2 Assignments
0 Petitions
Accused Products
Abstract
A single-turn loop antenna suitable for inclusion within the cabinet of a television receiver has at least one gap forming a pair of feed terminals. Circuitry connects to the feed terminals for tuning the antenna over at least a portion of the television frequency bands and for coupling signals from the feed terminals to a transmission line. The circuitry provides isolation so the tuning of the antenna by the tuning circuitry is unaffected by the impedance of the transmission line or its terminating impedance and variations thereof. The circuitry is affixed to the loop proximate to the feed terminals, and the transmission line is affixed to the periphery of the loop and departs therefrom at a neutral point located, for example, opposite to the gap.
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Citations
28 Claims
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1. An antenna arrangement for inclusion within a cabinet of a receiver including a tuner and operable over selected frequency bands comprising:
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a loop of electrically conductive material, having at least one gap, said gap forming respective first and second feed terminals, said loop having at least one neutral point thereon at which a potential equal to the average of potentials at said first and second feed terminals is developed when electromagnetic radiation impinges upon said loop; circuit means having input and common terminals for receiving an input signal therebetween, and having an output terminal for supplying an output signal responsive to said input signal, said circuit means being located proximate to said gap and including means for respectively coupling said input and common terminals to the first and second feed terminals of said gap, tuning circuitry connected between said input and common terminals for tuning said loop over at least a portion of said selected frequency bands, and means for coupling signals from said tuning circuitry to said output terminal, said signal coupling means isolating said tuning circuitry for making said tuning circuitry substantially unaffected by an impedance at said output terminal; and a transmission line having a conductor connected to said output terminal for receiving said output signal and for coupling said output signal to said tuner, said transmission line conductor being disposed along the periphery of said loop between said output terminal and said neutral point and departing from said loop proximate to said neutral point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An antenna arrangement for inclusion within a cabinet of a television receiver including a tuner and operable over television frequency bands comprising:
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a single-turn loop formed from a strip of electrically conductive material, having two gaps oppositely disposed thereon, each said gap being at a predetermined acute angle with respect to a direction along said strip, each said gap forming respective first and second feed terminals, wherein a substantial part of said loop lies in a plane and wherein said strip has a width that is oriented substantially perpendicular to said plane, said loop having two neutral points thereon at which a potential equal to the average of potentials at said first and second feed terminals is developed when electromagnetic radiation impinges upon said loop; first and second signal terminals located intermediate to said gaps within an area defined by said loop; two balanced transmission lines each having a first conductor for coupling the first feed terminal of its associated gap to said first signal terminal, and each having a second conductor for coupling the second feed terminal of its associated gap to said second signal terminal; circuit means having input and common terminals for receiving an input signal therebetween, and having an output terminal for supplying an output signal responsive to said input signal, said circuit means being located proximate to said signal terminals and including means for respectively coupling said input and common terminals to said first and second signal terminals, tuning circuitry connected between said input and common terminals for tuning said loop over at least a portion of said television frequency bands, and means for coupling signals from said tuning circuitry to said output terminal, said signal coupling means isolating said tuning circuitry for making said tuning circuitry substantially unaffected by an impedance at said output terminal; and a transmission line having a conductor connected to said output terminal for receiving said output signal and for coupling said output signal to said tuner, said transmission line conductor being disposed along the first conductor of one of said balanced transmission lines and along the periphery of said loop between said output terminal and one of said neutral points and departing from said loop proximate to said one of said neutral points.
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28. An antenna arrangement for inclusion within a cabinet of a television receiver including a tuner and operable over television frequency bands comprising:
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a loop of electrically conductive material having a gap therein forming respective first and second feed terminals, said loop having a neutral point thereon at which a potential equal to the average of potentials at said first and second feed terminals is developed when electromagnetic radiation impinges upon said loop; circuit means having input and common terminals for receiving an input signal therebetween, and having an output terminal for supplying an output signal responsive to said input signal, said circuit means being located proximate to said gap and including means for respectively coupling said input and common terminals to the first and second feed terminals of said gap, tuning circuitry connected between said input and common terminals for tuning said loop over at least a portion of said television frequency bands responsive to a control potential, and coupling circuit means for coupling signals from said tuning circuitry to said output terminal, said signal coupling means isolating said tuning circuitry for making said tuning circuitry substantially unaffected by an impedance at said output terminal, said coupling circuit means being conditioned for coupling by an operating potential; and a transmission line for coupling said output signal to said tuner and being disposed along the periphery of said loop between said output terminal and said neutral point and departing from said loop proximate to said neutral point, said transmission line including a plurality of signal conductors substantially uniformly spaced from said loop between said output terminal and said neutral point, a strip of electrically insulating material located between said conductors and said loop to form said uniform spacing, said signal conductors being affixed to said strip on a side thereof opposite to that affixed to said loop, and wherein a first one of said signal conductors couples said output signal to said tuner, a second one of said signal conductors couples said control potential to said tuning circuitry, and a third one of said signal conductors couples said operating potential to said coupling circuit means.
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Specification