Importance

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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.

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First Claim