INTERNAL MULTI-BAND ANTENNA AND METHODS
3 Assignments
0 Petitions
Accused Products
Abstract
An internal multi-band antenna and a radio device comprising such an antenna. A radiator (320) of the antenna is a conductivepart of the outer cover (COV) of a radio device or conductive coating of the cover. The radiator is electromagnetically fed by a feed element (330) which is isolated from the radiator by a relatively thin dielectric layer. The feed element is shaped so that it has, together with the other parts of the antenna, resonance frequencies in the range of at least two desired operating bands. The antenna structure further includes a parasitic tuning element (340) and a switch (SW) by which the tuning element can be coupled to the signal ground (GND) through at least two alternative reactive circuits. The tuning element is dimensioned and placed and the component values of the reactive circuits are chosen so that of two operating bands of the antenna the locations of both are displaced in a desired way when changing the state of the switch. By means of a relatively simple switch arrangement, the antenna can be made to cover the frequency ranges of four systems, and it can also be optimised for each system separately, because its operating bands only cover the range used by one system at a time.
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Citations
42 Claims
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1-12. -12. (canceled)
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13. A multi-band antenna, comprising:
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a radiating element; a feed element; and a tuning element; wherein the tuning element is electrically coupled to a ground via a plurality of alternative reactive circuits. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A radio device, comprising:
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an external cover, said external cover comprised of a conductive radiating portion; an internal circuit board substrate comprised of a ground plane; a feed element; and a tuning element; wherein the feed element and the tuning element are each disposed proximate said external cover and are each electrically coupled to the internal circuit board substrate. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. An internal multi-band antenna of a radio device, comprising at least a lower and an upper operating band and further comprising:
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a ground plane; a radiating element; a feed element; and a parasitic tuning element; wherein the radiating element follows an outer surface of the radio device and is galvanically isolated from the feed element and the tuning element by a relatively thin dielectric layer in which there is an electromagnetic coupling between the radiating element and the feed element to transfer transmitting energy to the field of the radiating element and to transfer receiving energy to the field of the feed element, said feed element comprising a conductor strip comprised of a feed point of the antenna and a first part which together with other parts of the antenna is arranged to resonate in the range of the lower operating band of the antenna; and wherein a second part of the antenna is arranged to resonate in the range of the upper band of the antenna such that the tuning element belongs to a tuning circuit which further comprises a multi-way switch and at least two reactive circuits so that the tuning element can be connected from its tuning point to the signal ground through the switch and through one reactive circuit at a time to implement at least two alternative locations for both the lower and the upper operating band. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A method of operating multi-band antenna, the antenna comprising a radiating element, a feed element, and a tuning element, the method comprising:
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electrically coupling the tuning element to a ground via a first of a plurality of reactive circuits; and electrically coupling the tuning element to a ground 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 (41, 42)
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Specification