Adjustable multi-band antenna and methods
First Claim
1. A multiband antenna having at least a lower operating frequency band and an upper operating frequency band, the antenna comprising:
- a dielectric element having a first dimension;
a conductive coating deposited on the dielectric element, the conductive coating having a first portion and a second portion, wherein said first and second portions are formed substantially parallel to each other along said first dimension;
a feed structure, comprising at least a first and a second feed points, said feed structure coupled to the conductive coating; and
a nonconductive slot formed between the first and second portions along said first dimension;
wherein said slot is configured to form a quarter wave resonator in said upper operating band; and
wherein said first and second portions cooperate to form a quarter wave resonator in said lower operating band.
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Accused Products
Abstract
An adjustable multi-band planar antenna especially applicable in mobile terminals. In one embodiment, the feed of the antenna is connected by a multiple-way switch to at least two alternative points of the radiator element. When the feed point is changed, the resonance frequencies and thus the operating bands of the antenna change. In addition to varying the basic dimensions of the antenna, the distance between one feed point to another and a possible short-circuit point in the radiator, the value of the series capacitance produced by a reactive circuit that is formed between the feed point and switch, and the distance between the ground plane and the radiator, are parameters that may affect the antenna design.
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Citations
26 Claims
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1. A multiband antenna having at least a lower operating frequency band and an upper operating frequency band, the antenna comprising:
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a dielectric element having a first dimension; a conductive coating deposited on the dielectric element, the conductive coating having a first portion and a second portion, wherein said first and second portions are formed substantially parallel to each other along said first dimension; a feed structure, comprising at least a first and a second feed points, said feed structure coupled to the conductive coating; and a nonconductive slot formed between the first and second portions along said first dimension; wherein said slot is configured to form a quarter wave resonator in said upper operating band; and wherein said first and second portions cooperate to form a quarter wave resonator in said lower operating band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An antenna operable in at least a lower and an upper operating frequency bands, said antenna comprising:
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a radiating element having at least first and second feed points, a ground point, and a short circuit point; a selector circuit configured to select at least one of said at least lower and upper operating frequency bands, said selector circuit comprising; a first multi-way switch, having at least one input port and at least first and second output ports; and at least first and second reactive circuits; wherein, said first and second feed points are coupled to said first and second output ports through said first and second reactive circuits, respectively.
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13. A mobile radio device comprising an antenna operable in at least a lower and an upper operating frequency bands, a feed structure, and a signal ground, said antenna comprising:
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a radiating element having at least first and second feed points, a ground point, and a short circuit point; a selector circuit configured to select at least one of said at least lower and upper operating frequency bands, said selector circuit comprising; a first multi-way switching element, having at least one input port and at least first and second output ports; and at least first and second reactive circuits; wherein, said first and second feed points are coupled to said first and second output ports through said first and second reactive circuits, respectively; and wherein said at least one input port is configured to be coupled to said antenna through said feed structure. - View Dependent Claims (14)
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15. A method of operating multi-band antenna, the antenna comprising a radiating element, and at least first and second feed points, the method comprising:
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selectively electrically coupling said first feed point to a transceiver via a first of a plurality of reactive circuits;
orselectively electrically coupling said second feed point to a transceiver via a second of a plurality of reactive circuits; wherein the first and second reactive circuits cause the antenna to operate in first and second frequency bands, respectively. - View Dependent Claims (16)
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17. An adjustable antenna of a radio device, said radio device comprising an antenna port, said antenna comprising:
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a signal ground; a radiating element, comprising; at least a first and a second feed points; a ground point; and a short circuit port; a feed conductor; and an adjusting circuit configured to effect at least one of said at least lower and upper operating frequency bands, said circuit comprising; a first multi-way switch, comprising at least one input port and at least a first and a second output ports; and at least first and second reactive circuits; wherein, said first and second feed points are coupled to said first and second output ports through said first and second reactive circuits respectively; and wherein said at least one input port is configured to be coupled to said antenna through said feed conductor. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification