Method and circuit for providing RF isolation of a power source from an antenna and an RFID device employing such a circuit
First Claim
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1. An RFID device comprising:
- (a) electronic circuitry suitable for an RFID device comprising a radio frequency section including first and second ports for connection of a power source thereto for providing power to said circuitry;
(b) an antenna;
(c) a battery having two terminals which provides the circuitry with power; and
(d) at least one transmission line having an effective length of one quarter wavelength coupled between both terminals of the battery and said first and second terminals ports.
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Abstract
An RFID device including:
- electronic circuitry suitable for an RFID device comprising a radio frequency section;
- an antenna;
- a battery which provides the device with power; and
- at least one quarter wavelength transmission line coupled between the battery and one or both of the electronic circuitry and the antenna.
24 Citations
26 Claims
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1. An RFID device comprising:
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(a) electronic circuitry suitable for an RFID device comprising a radio frequency section including first and second ports for connection of a power source thereto for providing power to said circuitry; (b) an antenna; (c) a battery having two terminals which provides the circuitry with power; and (d) at least one transmission line having an effective length of one quarter wavelength coupled between both terminals of the battery and said first and second terminals ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An RFID device comprising:
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(a) electronic circuitry suitable for an RFID device comprising a radio frequency section; (b) an antenna; (c) a battery which provides the device with power; and (d) at least one quarter wavelength transmission line coupled between the battery and one or both of the electronic circuitry and the antenna, wherein said transmission line is a shorted transmission line formed of a single conductor folded so two sections thereof are parallel and form a shorted transmission line two conductors, said single conductor connecting a terminal of said battery to said circuitry and also comprising a second conductor which connects a second terminal of said battery to said antenna and thereby to said circuitry. - View Dependent Claims (23, 24, 25, 26)
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Specification