Compact tunable antenna
First Claim
1. A tunable antenna for transmitting and/or receiving a RF signal at a desired one of a plurality of different frequencies, the antenna comprising:
- a conductive sheet;
an electrically conductive tab having a width dimension and a length dimension, the electrically conductive tab being positioned adjacent to, but spaced from, the conductive sheet;
a plurality of switches placed along the width dimension of the electrically conductive tab, each switch of said plurality of switches controllable to electrically couple the conductive sheet to the electrically conductive tab;
a feed line for coupling an RF signal to and/or from the electrically conductive tab; and
the plurality of switches being controllable to change a desired resonant frequency at which the antenna transmits and/or receives the RF signal.
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Accused Products
Abstract
The present disclosure relates to a method and an antenna for transmitting/receiving a RF signal at a plurality of different frequencies. Transmitting/receiving a RF signal at a plurality of different frequencies is achieved by providing a F antenna comprising a plurality of switches which can be used to adjust the resonant frequency of the antenna. By providing a F antenna, the antenna will be much smaller than the wavelength at which the antenna is operating. This allows the antenna to be used in compact devices such as PDA'"'"'s and cellular phones.
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Citations
36 Claims
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1. A tunable antenna for transmitting and/or receiving a RF signal at a desired one of a plurality of different frequencies, the antenna comprising:
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a conductive sheet;
an electrically conductive tab having a width dimension and a length dimension, the electrically conductive tab being positioned adjacent to, but spaced from, the conductive sheet;
a plurality of switches placed along the width dimension of the electrically conductive tab, each switch of said plurality of switches controllable to electrically couple the conductive sheet to the electrically conductive tab;
a feed line for coupling an RF signal to and/or from the electrically conductive tab; and
the plurality of switches being controllable to change a desired resonant frequency at which the antenna transmits and/or receives the RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 25)
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14. A method for transmitting and/or receiving a RF signal at a desired one of a plurality of different frequencies comprising:
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providing an electrically conductive sheet;
providing an electrically conductive tab having a width dimension and a length dimension, the electrically conductive tab positioned adjacent to the conductive sheet;
providing a plurality of switches along a width of the conductive metal tab, each switch of said plurality of switches controllable to electrically couple the conductive sheet to the electrically conductive tab;
coupling an RF signal to and/or from the electrically conductive tab; and
closing the plurality of switches in a controlled manner to change a desired resonant frequency at which the antenna transmits and/or receives the RF signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26)
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27. An antenna for transmitting and/or receiving a RF signal at a desired one of a plurality of different frequencies, the antenna comprising:
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a conductive sheet;
an electrically conductive tab having a width dimension and a length dimension, the electrically conductive tab positioned adjacent to the conductive sheet;
a plurality of switches placed along the width dimension of the electrically conductive tab, each switch of said plurality of switches controllable to electrically couple the conductive sheet to the electrically conductive tab;
a feed line for coupling an RF signal to and/or from the electrically conductive tab; and
the plurality of switches being controllable to change a desired resonant frequency at which the antenna transmits and/or receives the RF signal, and wherein the plurality of switches are placed at selected points so as to allow the radiation pattern of RF signal to be adjusted. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification