Multiband antenna system

A multiband radio antenna system for installation on an automotive vehicle and comprising:

• 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.

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.

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:

• 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.