Multiband antenna system
First Claim
1. A multiband wire antenna for use with radio apparatus operating in a prescribed lower frequency and a prescribed higher frequency range and having an overall electrical length equivalent to one quarter wavelength of signals in the lower frequency range, the antenna comprisinga terminating end connectable to radio apparatus and a distal end opposite the terminating end,a non-conductive flexible solid core longitudinally extending from the terminating end to the distal end,a wire continuously extending between the terminating end and the distal end and wound around the solid core, anda resonant circuit section having a signal blocking impedance for blocking signals in the prescribed higher frequency range, wherein the resonant circuit section comprises a multiple-turn coiled section of the continuously extending wire, a layer of conductive material disposed internal to the coiled section around the solid core and a layer of dielectric material disposed between the conductive layer and the coil;
- the resonant circuit section disposed a predetermined distance from the terminating end such that a portion of the wire between the resonant circuit section and the terminating end has an electrical length equivalent to one quarter wavelength of a signal in the prescribed higher frequency range.
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Accused Products
Abstract
An AM/FM/CB/cellular telephone antenna includes a first frequency self-resonant circuit at a position above the lower end of the antenna such that the electrical length of the lower section of the antenna is equivalent to one-quarter wavelength for a frequency in the FM frequency range and a second frequency self-resonant circuit disposed below the first frequency self-resonant circuit. The first self-resonant circuit presents a high impedance in the FM frequency band and the second self-resonant circuit presents a high impedance in the cellular frequency range. The entire length of the antenna is equivalent to one-quarter wavelength in a frequency in the CB frequency band. The antenna wire is wound around a fiberglass core, and the FM self-resonant circuit is formed by a tightly wound, coiled section of the wire together with a thin-walled brass tube extending over the core in the area of the tightly wound section. A thin dielectric film is applied between the tube and the tightly wound section of antenna wire thereby forming a capacitor. There is no direct electrical connection between the antenna wire and the tube, and the capacitance between these elements is essentially only stray capacitance. Two antennas, each comprising two frequency self-resonant circuits, are connected by means of a multiplexing circuit to AM/FM, CB and cellular telephone apparatus.
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Citations
24 Claims
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1. A multiband wire antenna for use with radio apparatus operating in a prescribed lower frequency and a prescribed higher frequency range and having an overall electrical length equivalent to one quarter wavelength of signals in the lower frequency range, the antenna comprising
a terminating end connectable to radio apparatus and a distal end opposite the terminating end, a non-conductive flexible solid core longitudinally extending from the terminating end to the distal end, a wire continuously extending between the terminating end and the distal end and wound around the solid core, and a resonant circuit section having a signal blocking impedance for blocking signals in the prescribed higher frequency range, wherein the resonant circuit section comprises a multiple-turn coiled section of the continuously extending wire, a layer of conductive material disposed internal to the coiled section around the solid core and a layer of dielectric material disposed between the conductive layer and the coil; the resonant circuit section disposed a predetermined distance from the terminating end such that a portion of the wire between the resonant circuit section and the terminating end has an electrical length equivalent to one quarter wavelength of a signal in the prescribed higher frequency range. - View Dependent Claims (2, 3, 4, 5)
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6. A multiband radio antenna system for installation on an automotive vehicle and comprising:
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a pair of spaced apart antennas each comprising a terminating end connectable to a transmitter/receiver and a distal end opposite the terminating end, each of the antennas having a non-conductive flexible solid core longitudinally extending from the terminating end to the distal end, a wire continuously extending between the terminating end and the distal end and wound around the solid core, and having an overall electrical length equivalent to one quarter wavelength of a frequency in the CB frequency range; each of the antennas comprising a resonant circuit section disposed a predetermined distance from the terminating end such that a portion of the wire between the resonant circuit section and the terminating end has an electrical length equivalent to one quarter wavelength in the FM frequency range; wherein the resonant circuit section of each antenna comprises a multiple-turn coiled section of the continuously extending wire, a layer of conductive material disposed internal to the coiled section around the solid core, and a layer of dielectric material disposed between the conductive layer and the coil the resonant circuit section in each of said antennas having a signal blocking impedance at a selected frequency in the FM frequency range defined by an inductive component provided by turns of the respective multiple-turn coiled section in each antenna and a capacitive component provided solely by distributed capacitance between the respective layer of conductive material and turns of the respective multiple-turn coiled section in each antenna. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. An automotive vehicle antenna having an overall electrical length equivalent to one-quarter wavelength of a frequency in the CB frequency range, the antenna comprising a terminating end of the antenna connectable to transmitter/receiver apparatus and a distal end opposite the terminating end, the wire antenna being formed from
a solid core antenna wire extending continuously between the terminating end and the distal end the antenna further comprising: -
a first self-resonant circuit section consisting of a first multiple-turn coiled section formed from a first portion of the antenna wire and a layer of conductive material disposed internal to the first multiple-turn coiled section and spaced apart from the multiple-turn coiled section, the first self resonant circuit having a blocking impedance in the FM frequency range; a second self-resonant circuit section consisting of a multiple-turn coiled section formed from a second portion of the antenna wire spaced apart from the first portion of the antenna wire, the second self-resonant circuit having a blocking impedance in the cellular frequency range; the first self-resonant circuit section disposed a predetermined distance from the terminating end such that a portion of the antenna wire between the first self-resonant circuit section and the terminating end forms an electrical length equivalent to one-quarter wavelength in the FM frequency range; and the second self-resonant circuit section disposed a predetermined distance from the terminating end such that a portion of the antenna wire between the second self-resonant circuit section and the terminating end forms an electrical length equivalent to three-quarter wavelength in the cellular frequency range. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A multiband radio antenna system for installation on an automotive vehicle comprising a pair of spaced apart antennas each comprising a non-conductive, longitudinally extending core and each having a terminating end connectable to transmitter/receiver apparatus and a distal end opposite the terminating end, each of the antennas being formed from a solid core antenna wire wound around the non-conductive core and extending between the terminating end and the distal end and forming an antenna having an overall electrical length equivalent to one-quarter wavelength of a frequency in the CB frequency range, each of the antennas further comprising:
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a first self-resonant circuit section consisting of a portion of the antenna wire formed into a multiple-turn coiled section and a layer of conductive material extending around the core and disposed internal to the multiple turn coiled section and spaced apart from the multiple-turn, coiled sections the first self-resonant circuit section having a signal blocking impedance at a selected frequency in the FM frequency range the first self resonant section disposed a first predetermined distance from the terminating end such that a portion of the antenna wire between the first resonant circuit section and the terminating end forms an antenna having an electrical length equivalent to one-quarter wavelength in the FM frequency range; a second self-resonant circuit section having a signal blocking impedance in the cellular telephone frequency range and consisting of turns of the antenna wire wound around the core and disposed a second predetermined distance from the terminating end such that a portion of the antenna wire between the second self-resonant circuit section and the terminating end forms an antenna having an electrical length equivalent to three-quarter wavelength in the cellular frequency range. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification