Stacked multi-resonator antenna
First Claim
1. An antenna structure comprising at least one resonator element, a ground plane and a feed line, wherein said at least one resonator element includes a first resonator element comprising a first end and a second end, said first resonator element being meandering in shape to define at least two adjacent resonator segments between said first and second ends, the antenna structure being operable in at least a first operating frequency band and a second operating frequency band, the second operating frequency band having a higher center frequency than said first operating frequency band, wherein said first resonator element has a physical length between said first and second ends which causes said first resonator to resonate in said first operating frequency band when said first resonator element is excited by a signal in a first operation frequency band, and wherein said at least one resonator element is embedded in a dielectric substrate and the spacing between said at least two adjacent resonator segments is such that, when said first resonator element is excited by a signal in said second operating frequency band, electromagnetic coupling occurs between said at least two adjacent resonator segments and causes said first resonator element to resonate in said second operating frequency band.
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Accused Products
Abstract
An antenna structure having a ground plane, a feed line and at least one resonator element that is embedded in a dielectric substrate and which is meandering in shape such that it includes at least two adjacent resonator segments. As a result, the resonator element resonates in two separate frequency bands. A second resonator element is provided, the second resonator element being dimensioned to resonate in a frequency band below a third operating frequency band, the feed line and ground plane being arranged to cause a resonance in a frequency band located above the third operating frequency band. During use, the combined effect of the resonance of the second resonator element and of the feed line and ground plane is to cause the antenna structure to resonate in the third operating frequency band.
308 Citations
18 Claims
- 1. An antenna structure comprising at least one resonator element, a ground plane and a feed line, wherein said at least one resonator element includes a first resonator element comprising a first end and a second end, said first resonator element being meandering in shape to define at least two adjacent resonator segments between said first and second ends, the antenna structure being operable in at least a first operating frequency band and a second operating frequency band, the second operating frequency band having a higher center frequency than said first operating frequency band, wherein said first resonator element has a physical length between said first and second ends which causes said first resonator to resonate in said first operating frequency band when said first resonator element is excited by a signal in a first operation frequency band, and wherein said at least one resonator element is embedded in a dielectric substrate and the spacing between said at least two adjacent resonator segments is such that, when said first resonator element is excited by a signal in said second operating frequency band, electromagnetic coupling occurs between said at least two adjacent resonator segments and causes said first resonator element to resonate in said second operating frequency band.
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15. An antenna structure comprising a ground plane, a feed line, and at least one resonator element, wherein in respect of an operating frequency band of said antenna structure, said at least one resonator element is dimensioned to resonate in a frequency band having a lower center frequency than said operating frequency band, the feed line and ground plane being arranged to cause a resonance in a frequency band having a higher center frequency than said operating frequency band, said at least one resonator element, the feed line and the ground plane being dimensioned and arranged such that the combined effect of the respective resonance of said at least one resonator element and of said feed line and ground plane is to cause said antenna structure to resonate in said operating frequency band.
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16. A wireless communications device operable in at least a first operating frequency band and a second operating frequency band, the device comprising an antenna structure comprising at least one resonator element, a ground plane and a feed line, wherein said at least one resonator element includes a first resonator element comprising a first end and a second end, said first resonator element being meandering in shape to define at least two adjacent resonator segments between said first and second ends, the antenna structure being operable in at least the first operating frequency band and the second operating frequency band, the second operating frequency band having a higher center frequency than said first operating frequency band, wherein said first resonator element has a physical length between said first and second ends which causes said first resonator to resonate in said first operating frequency band when said first resonator element is excited by a signal in the first operating frequency band, and wherein said at least one resonator element is embedded in a dielectric substrate and the spacing between said at least two adjacent resonator segments is such that, when said first resonator element is excited by a signal in said second operating frequency band, electromagnetic coupling occurs between said at least two adjacent resonator segments and causes said first resonator element to resonate in said second operating frequency band, wherein said wireless communications device is connected to said antenna structure via said feed line and is adapted to transmit or receive signals in both said first operating frequency band and said second operating frequency band via said first resonator element.
Specification