Double resonance antenna structure for several frequency ranges
First Claim
1. An antenna structure for use in a multiband device, comprising a planar antenna element and a ground plane so that the said antenna element is short-circuited to the ground plane at least at one place, characterized in that said antenna element has at least two separate resonance frequencies, and that said antenna element has at least two connection points for connecting feed lines of the antenna, so that the antenna structure works in at least two TX-frequency bands and two RX-frequency bands of at least two wireless systems.
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Accused Products
Abstract
The invention relates to small-sized antenna systems, especially planar antenna structures operating on several frequency bands. The antenna structure of the invention comprises a radiating antenna element with at least two lips. Thus, the antenna structure has two basic resonance frequencies, which are defined by the dimensions of the lips of the antenna element, gaps between them, and the other dimensions of the antenna structure. The radiating antenna structure is connected to the ground plane at least at one place. The radiating antenna element comprises at least two connection points, which are used for connecting the feed lines of the transmitter and receiver, and for connecting special tuning elements. The resonance frequencies of the antenna structure may be adjusted by connecting the said tuning elements to the connection points and antenna feed lines so that the antenna structure is operable on more than two frequency bands. The switches may be conventional semiconductor switches, such as FET switches or PIN diodes. Various optionally connectable tuning element or antenna feed arrangements may be used for carrying out an antenna arrangement which may be tuned in on all reception and transmission bands of an arrangement with several frequency ranges and mobile phone systems.
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Citations
15 Claims
- 1. An antenna structure for use in a multiband device, comprising a planar antenna element and a ground plane so that the said antenna element is short-circuited to the ground plane at least at one place, characterized in that said antenna element has at least two separate resonance frequencies, and that said antenna element has at least two connection points for connecting feed lines of the antenna, so that the antenna structure works in at least two TX-frequency bands and two RX-frequency bands of at least two wireless systems.
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9. A mobile station, the antenna arrangement of which comprises a radiating antenna element and a ground plane, characterized in that said antenna element has at least two connection points for connecting the feed lines, and that the said antenna element further comprises at least one switch and at least one tuning element, said at least one tuning element being connectable to the connection point of the antenna element with said at least one switch for changing at least one resonance frequency of the antenna arrangement.
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10. An antenna structure for use in a multiband device having a planar antenna element and a ground plane, the antenna element being short-circuited to the ground plane at least at one place, wherein the antenna element has
at least two connection points in the antenna element for connection of the feed lines of the antenna structure, at least two lips in the antenna element for forming at least two separate resonance frequency bands of the antenna structure, and the antenna structure further has at least one tuning element for changing a resonance frequency of the antenna structure, so that the antenna structure works in at least two TX-frequency bands and two RX-frequency bands of at least two wireless systems.
Specification