Flat plate antenna module
First Claim
1. A planar antenna module for installation under a dielectric cover of a vehicle, comprising:
- a dielectric substrate;
a mobile telephone antenna loop for transmission and reception of mobile cellular telephone signals and comprising a plurality of conductor sections on the substrate forming a substantially square loop having a perimeter of an electrical length approximately equal to two wavelengths of a signal in the frequency range of cellular telephone signals, the conductor sections at each corner of the square loop forming four separate loading capacitors, the conductor sections forming the capacitors adapted to be shortened to optimize the antenna effectiveness when installed in the proximity of dielectric covers of differing dimensions and dielectric characteristics; and
conductor sections disposed on the substrate forming a substantially square AM/FM antenna loop surrounding the mobile telephone antenna loop, the AM/FM antenna loop comprising a pair of conductor sections of substantially equal length and a capacitor, each conductor section having one end connected to an antenna feed line and another end connected to one side of the capacitor, the capacitor having a predetermined value of capacitance such that the capacitor presents a substantially short circuit at FM frequencies.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna module for use a non-conductive cab of a motor vehicle includes a dielectric substrate and one or more antenna loops arranged on the substrate. The substrate is adapted to be installed between the headliner of a cab and the dielectric roof. The module may include a CB antenna loop, an AM/FM antenna loop, a cellular mobile telephone antenna loop, and a global positioning system antenna, without the need for any antenna structure external to the cab. The antennae are arranged on the module in a nested configuration. A CB antenna, provided with loading coils, forms an outer loop. An AM/FM antenna loop, including a capacitor yielding a substantially short circuit connection in the FM frequency range, forms a FM frequency antenna loop and an AM frequency dipole, within the CB loop. A multiloop array cellular telephone antenna is arranged within the AM/FM loop. A standard crossed dipole GPS antenna is positioned in an area between the CB loop and the AM/FM loop near one corner of the substrate. Coaxial antenna feedlines connected to the various antennae are routed through cab support posts to associated electronic circuitry in the cab.
198 Citations
21 Claims
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1. A planar antenna module for installation under a dielectric cover of a vehicle, comprising:
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a dielectric substrate; a mobile telephone antenna loop for transmission and reception of mobile cellular telephone signals and comprising a plurality of conductor sections on the substrate forming a substantially square loop having a perimeter of an electrical length approximately equal to two wavelengths of a signal in the frequency range of cellular telephone signals, the conductor sections at each corner of the square loop forming four separate loading capacitors, the conductor sections forming the capacitors adapted to be shortened to optimize the antenna effectiveness when installed in the proximity of dielectric covers of differing dimensions and dielectric characteristics; and conductor sections disposed on the substrate forming a substantially square AM/FM antenna loop surrounding the mobile telephone antenna loop, the AM/FM antenna loop comprising a pair of conductor sections of substantially equal length and a capacitor, each conductor section having one end connected to an antenna feed line and another end connected to one side of the capacitor, the capacitor having a predetermined value of capacitance such that the capacitor presents a substantially short circuit at FM frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A planar antenna module for installation under a dielectric cover of a vehicle, comprising:
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a dielectric substrate; a mobile telephone antenna loop for transmission and reception of mobile cellular telephone signals and comprising a plurality of conductor sections on the substrate forming a substantially square loop having a perimeter of an electrical length approximately equal to two wavelengths of a signal in the frequency range of cellular telephone signals, the conductor sections at each corner of the square loop forming four separate loading capacitors, the conductor sections forming the capacitors adapted to be shortened to optimize the antenna effectiveness when installed in the proximity of dielectric covers of differing dimensions and dielectric characteristics; the mobile telephone antenna loop comprising an array of four individual, substantially square antenna loops, each of the individual loops having sides of an electrical length equivalent to one quarter of one wavelength of the signal in the frequency range of cellular telephone signals. - View Dependent Claims (14, 15, 16, 17)
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18. An antenna module comprising:
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a planar dielectric substrate adapted to be installed between the headliner of an automotive vehicle and a dielectric roof; a pair of electrical conductors sections and a capacitor disposed on the substrate, each conductor section having one end connected to an antenna feedline and another end connected to one side of the capacitor and forming a substantially square antenna loop; each side of the loop having an electrical length approximately equal to one wavelength at a frequency in the FM frequency range and the capacitor having a value of capacitance such that the capacitor presents an essentially short circuit in the FM frequency range and a substantial impedance in the AM frequency range, whereby the capacitor provides a substantially short circuit connection in the FM frequency range and a significant impedance value in the AM frequency range providing a loop antenna in the FM frequency range and a dipole antenna in the AM frequency range. - View Dependent Claims (19, 20, 21)
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Specification