Communication devices, a radio frequency identification device, and methods of communicating
First Claim
1. A communication device comprising:
- a first antenna operable to receive wireless communication signals;
a second antenna having plural leads, the second antenna being operable to output wireless communication signals;
a connection including plural conductive lines having respective first ends and second ends, the connection being coupled with the leads of the second antenna at the first ends of the lines;
a switch coupled with the second ends of the lines, the switch being operable to provide selective shorting and isolation of the leads to alter an impedance of the second antenna between a low impedance and a high impedance greater than the low impedance; and
wherein the connection provides the low load impedance of the second antenna during receiving of wireless communication signals via the first antenna.
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Accused Products
Abstract
The present invention provides communication devices, communication systems and methods of communicating. According to one embodiment of the invention, a communication device includes: a first antenna operable to receive wireless communication signals; a second antenna having plural leads, the second antenna being operable to output wireless communication signals; a connection including plural conductive lines having respective first ends and second ends, the connection being coupled with the leads of the second antenna at the first ends of the lines; and a switch coupled with the second ends of the connection, the switch being operable to provide one of selective shorting and isolation of the leads. One method of communicating of the invention includes: forming a first antenna; forming a second antenna; receiving wireless interrogation signals using the first antenna; outputting wireless identification signals using the second antenna; opening a coupling intermediate plural leads of the second antenna during the receiving.
89 Citations
25 Claims
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1. A communication device comprising:
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a first antenna operable to receive wireless communication signals;
a second antenna having plural leads, the second antenna being operable to output wireless communication signals;
a connection including plural conductive lines having respective first ends and second ends, the connection being coupled with the leads of the second antenna at the first ends of the lines;
a switch coupled with the second ends of the lines, the switch being operable to provide selective shorting and isolation of the leads to alter an impedance of the second antenna between a low impedance and a high impedance greater than the low impedance; and
wherein the connection provides the low load impedance of the second antenna during receiving of wireless communication signals via the first antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 24)
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13. A communication device comprising:
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a first antenna operable to receive wireless communication signals;
a second antenna having plural leads operable to output wireless communication signals, the second antenna being selectively configured between a first load impedance and a second load impedance lower than the first load impedance;
a switch electrically coupled with the second antenna, the switch being selectively operable to close to electrically short the leads and open to electrically insulate the leads;
a transformer intermediate the switch and the second antenna, the transformer being configured to effect the second load impedance of the second antenna responsive to the switch being open; and
wherein the switch is controlled to be open during the receiving of wireless communication signals to provide the second load impedance of the second antenna during the receiving via the first antenna and using the transformer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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25. A method of communicating within a radio frequency identification device comprising:
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forming a forward link antenna upon a first surface of a substrate;
forming a return link antenna upon the first surface of the substrate;
receiving wireless communication signals via the forward link antenna;
outputting wireless communication signals via the return link antenna responsive to the receiving;
spacing the forward link antenna and the return link antenna a distance of approximately one wavelength of the received and outputted wireless communication signals;
switching the impedance of the return link antenna during the outputting using a switch coupled with plural leads of the return link antenna;
opening the switch during the receiving;
transforming the load impedance of the return link antenna during the receiving using a transmission line having a length of approximately one quarter the wavelength of the received and outputted wireless communication signals; and
beam forming using the forward link antenna and the return link antenna.
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Specification