Mobile communication
First Claim
Patent Images
1. An antenna arrangement for a radio device, comprising:
- first and second antennas, whereby the first antenna operates on a first frequency band and the second antenna operates on a second frequency band, the second antenna drawing transmission power from the first antenna when the first antenna transmits radio signals on the first frequency band, the second antenna comprisinga radiating body having a first end and a second end, the second end selectively operating as an open end;
a feed point between the first end and the second end; and
a detuning switch for grounding the radiating body at a point between the feed point and the second end such that the power draw caused by the second antenna from the first antenna is reduced, the radiating body being disposed over a ground plane such that the second end overlies the ground plane and the first end does not overlie the ground plane.
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Abstract
An antenna arrangement for dual mode radio devices such as WCDMA/GSM or Bluetooth radio devices. The arrangement contains two antennas close to each other, where a shorting switch is used at an open end of one antenna to increase isolation by effectively converting the one antenna from a quarter wave length antenna to a half wave length antenna when not needed in order to improve the efficiency of the other antenna. The shorting switch is typically a MEMS switch and the antennas are typically PIFA antennas. A radio device containing the arrangement has also been disclosed.
151 Citations
23 Claims
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1. An antenna arrangement for a radio device, comprising:
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first and second antennas, whereby the first antenna operates on a first frequency band and the second antenna operates on a second frequency band, the second antenna drawing transmission power from the first antenna when the first antenna transmits radio signals on the first frequency band, the second antenna comprising a radiating body having a first end and a second end, the second end selectively operating as an open end; a feed point between the first end and the second end; and a detuning switch for grounding the radiating body at a point between the feed point and the second end such that the power draw caused by the second antenna from the first antenna is reduced, the radiating body being disposed over a ground plane such that the second end overlies the ground plane and the first end does not overlie the ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna arrangement comprising a first antenna and a second antenna, whereby the first antenna operates on a first frequency band and the second antenna operates on a second frequency band and thereby the second antenna draws transmission power from the first antenna when the first antenna transmits radio signals in the first frequency band, the second antenna comprising:
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a radiating body having a first end and a second end, the second end selectively operating as an open end; and a feed point between the first end and the second end;
the antenna arrangement further comprising;a detuning switch for grounding the radiating body at a point between the feed point and the second end in order to reduce said power draw. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A radio device comprising a first antenna and a second antenna, whereby the first antenna operates on a first frequency band and the second antenna operates on a second frequency band, the second antenna drawing transmission power from the first antenna when the first antenna transmits radio signals on the first frequency band, the second antenna comprising:
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a radiating body having a first end and a second end, the second end selectively operating as an open end; and a feed point between the first end and the second end;
the radio device further comprising;a detuning switch for grounding the radiating body at point between the feed point and the second end in order to reduce said power draw. - View Dependent Claims (20)
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21. A method of improving antenna isolation in a system comprising a first antenna and a second antenna, whereby the first antenna operates on a first frequency band and the second antenna operates on a second frequency band, the second antenna drawing transmission power from the first antenna when the first antenna transmits radio signals on the first frequency band, wherein the second antenna comprises a radiating body having a first end and second end a feed point between the first end and the second end, the method comprising the steps of:
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detuning the second antenna when idle by grounding the radiating body between the feed point and the second end; and not grounding the radiating body of the second antenna between the feed point and the second end when the second antenna is to be used. - View Dependent Claims (22)
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23. A controller for a system comprising a first antenna and a second antenna, whereby the first antenna operates on a first frequency band and the second antenna operates on a second frequency band, the second antenna drawing transmission power from the first antenna when the first antenna transmits radio signals on the first frequency band, wherein the second antenna comprises a radiating body having a first end and second end and a feed point between the first end and the second end, whereby the radiating body selectively grounds a point between the feed point and the second end of the radiating body, the controller comprising means for causing the grounding when the second antenna is idle to detune the second antenna and not to detune the second antenna when the second antenna is in use.
Specification