Antenna
First Claim
1. A radio telephone for use at frequencies greater than 200 MHz including an antenna which comprises an electrically insulative core of a solid material having a relative dielectric constant greater than 5, and a three-dimensional antenna element structure disposed on or adjacent the outer surface of the core and defining an interior volume, the material of the core occupying the major part of the said interior volume.
5 Assignments
0 Petitions
Reexamination
Accused Products
Abstract
An antenna for use at UHF and upwards has a cylindrical ceramic core with a relative dielectric constant of at least 5. A three-dimensional radiating element structure, consisting of helical antenna elements on the cylindrical surface of the core and connecting radial elements on a distal end face of the core, is formed by conductor tracks plated directly on the core surfaces. At the distal end face the elements are connected to an axially located feed structure in a plated axial passage of the core. The antenna elements are grounded on a plated sleeve covering a proximal part of the core which, in conjunction with the feeder structure, forms an integral balun for matching to an unbalanced feeder.
264 Citations
55 Claims
- 1. A radio telephone for use at frequencies greater than 200 MHz including an antenna which comprises an electrically insulative core of a solid material having a relative dielectric constant greater than 5, and a three-dimensional antenna element structure disposed on or adjacent the outer surface of the core and defining an interior volume, the material of the core occupying the major part of the said interior volume.
- 15. A radio telephone having an antenna the main resonant frequency of which is in excess of 500 MHz wherein the antenna comprises an electrically insulative antenna core of a material having a relative dielectric constant greater than 5, a three-dimensional antenna element structure disposed on or adjacent the outer surface of the core and defining an interior volume, and a feeder structure which is connected to the antenna element structure and passes through the core, the material of the core occupying the major part of the said interior volume.
- 28. A radio telephone for operation at a frequency in excess of 200 MHz having an antenna which comprises a solid electrically insulative antenna core which has a central longitudinal axis and is made of a material having a relative dielectric constant greater than 5, a feeder structure extending through the core on the central axis, and, disposed on the outer surface of the core, a plurality of antenna elements which are connected to the feeder structure at one end of the core and extend in the direction of the opposite end of the core to a common interconnecting conductor.
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38. A telephone antenna comprising an electrically insulative core of a solid material having a relative dielectric constant greater than 5, and a three-dimensional antenna element structure disposed on or adjacent the outer surface of the core and defining an interior space, the material of the core occupying the major part of said interior space.
- 39. An antenna for operation at frequencies in excess of 200 MHz, comprising an electrically insulative core of a solid material having a relative dielectric constant greater than 5, a three-dimensional antenna element structure disposed on or adjacent an outer surface of the core and defining an interior volume, and a feeder structure which passes through the core and provides an electrically balanced feed connection with the antenna element structure, the material of the core occupying the major part of said interior volume.
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46. An antenna for operation at a frequency in excess of 200 MHz comprising:
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an antenna core in the form of an electrically insulative dielectric body made of a solid material having a dielectric constant greater than 5, wherein the body has an axis of symmetry and an outer surface directed outwardly from said axis, said outer surface enclosing an interior volume at least 50 percent of which is occupied by said material, a plurality of conductive antenna elements on said outer surface, a feeder connection for connecting the antenna elements to a feeder, and an integral balun. - View Dependent Claims (47, 48, 49)
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50. An antenna for operation at a frequency in excess of 200 MHz comprising:
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an antenna core in the form of an electrically insulative dielectric body made of a solid material having a dielectric constant greater than 5, wherein the body has an axis of symmetry and an outer surface directed outwardly from said axis, said outer surface enclosing an interior volume at least 50 percent of which is occupied by said material, a plurality of conductive antenna elements on said outer surface, a feed connection, and a conductive sleeve formed on said outer surface and forming a cavity surrounding part of said dielectric body. - View Dependent Claims (51, 52, 53, 54, 55)
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Specification