Low-profile multi-band antenna
First Claim
1. A multi-band antenna, comprisinga ground-plane element defining a ground plane;
- an elongated ribbon-shaped first radiator element having opposing broad surfaces and disposed on the ground-plane element with the broad surfaces of a substantial segment of the first radiator element being at least somewhat parallel to the ground plane to define a first vertical loop when the ground plane is horizontally disposed;
a second radiator element;
an elongated ribbon-shaped coupling element having opposing broad surfaces and disposed on the ground-plane element with the broad surfaces of a substantial segment of the coupling element being at least somewhat parallel to the ground plane to define a vertical coupling loop when the ground plane is horizontally disposed, and with a portion of the coupling element being connected to a feed terminal;
wherein the first radiator element, the second radiator element and the coupling element are of such dimensions and are so disposed in relation to each other as to cause the first radiator element to resonate at a first predetermined frequency, to cause the second radiator element to resonate at a second predetermined frequency, to cause a signal at the first predetermined frequency to be inductively coupled between the first radiator element and the feed terminal and to cause a signal at the second predetermined frequency to be inductively coupled between the second radiator element and the feed terminal.
5 Assignments
0 Petitions
Accused Products
Abstract
A multi-band low-profile antenna includes a conductive ground-plane element; a first radiator element mounted on the ground-plane element to define a first vertical loop; a second radiator element mounted on the ground-plane element to define a second vertical loop; and a coupling element mounted on the ground-plane element to define a vertical coupling loop, with one end portion of the coupling element being connected to a feed terminal. In at least one embodiment, the first radiator element and the second radiator element are of such dimensions and are so disposed as to be parasitically coupled to each other, to cause the first radiator element to resonate at a first predetermined VHF frequency and to cause the second radiator element to resonate at a second predetermined VHF frequency. The coupling element is of such dimensions and is so disposed in relation to the first radiator element and the second radiator element as to cause a signal at the first predetermined VHF frequency to be inductively coupled between the first radiator element and the feed terminal and to cause a signal at the second predetermined VHF frequency to be inductively coupled between the second radiator element and the feed terminal. The antenna further includes a third radiator element of such dimensions and is so disposed as to resonate at a predetermined UHF frequency; and the coupling element is of such dimensions and is so disposed as to cause a signal at the predetermined UHF frequency to be inductively coupled between the third radiator element and the feed terminal. A compartment in the ground-plane element encloses circuit components of a communication device connected to the feed terminal.
58 Citations
33 Claims
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1. A multi-band antenna, comprising
a ground-plane element defining a ground plane; -
an elongated ribbon-shaped first radiator element having opposing broad surfaces and disposed on the ground-plane element with the broad surfaces of a substantial segment of the first radiator element being at least somewhat parallel to the ground plane to define a first vertical loop when the ground plane is horizontally disposed; a second radiator element; an elongated ribbon-shaped coupling element having opposing broad surfaces and disposed on the ground-plane element with the broad surfaces of a substantial segment of the coupling element being at least somewhat parallel to the ground plane to define a vertical coupling loop when the ground plane is horizontally disposed, and with a portion of the coupling element being connected to a feed terminal; wherein the first radiator element, the second radiator element and the coupling element are of such dimensions and are so disposed in relation to each other as to cause the first radiator element to resonate at a first predetermined frequency, to cause the second radiator element to resonate at a second predetermined frequency, to cause a signal at the first predetermined frequency to be inductively coupled between the first radiator element and the feed terminal and to cause a signal at the second predetermined frequency to be inductively coupled between the second radiator element and the feed terminal. - 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, 27)
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28. An antenna, comprising
a conductive ground-plane element defining a ground plane; -
an elongated ribbon shaped coupling element having broad opposing surfaces and disposed in relation to the ground-plane element to define a vertical coupling loop when the ground plane is horizontally disposed, with the broad surfaces of a substantial segment of the coupling element being at least somewhat parallel to the ground plane, and with one end portion of the coupling element being connected to a feed terminal; and an elongated ribbon-shaped radiator element having broad opposing surfaces and disposed on the substantial segment of the coupling element to define an auxiliary vertical loop when the ground plane is horizontally disposed, with the broad surfaces of a substantial segment of the radiator element being at least somewhat parallel to the ground plane; wherein the radiator element is of such dimensions and is so disposed as to resonate at a predetermined frequency; and wherein the coupling element is of such dimensions and is so disposed as to cause a signal at the predetermined frequency to be inductively coupled between the radiator element and the feed terminal; wherein another end portion of the coupling element is connected to the ground-plane element and each end of the radiator element is connected to the coupling element. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification