RFID DEVICE WITH MICROSTRIP ANTENNAS
First Claim
1. A Radio Frequency Identification (RFID) device, comprising:
- a first microstrip antenna comprising a microstrip positioned towards a first side of the device, and a Radio Frequency- (RF-)reflective back plane spaced from the microstrip of the first microstrip antenna;
a second microstrip antenna comprising a microstrip positioned farther from the first side of the device than the microstrip of the first microstrip antenna, and an RF-reflective back plane spaced from the microstrip of the second microstrip antenna; and
circuitry for receiving signals from the first and second microstrip antennas, wherein the first and second microstrip antennas are each independently coupled to the circuitry.
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Accused Products
Abstract
A Radio Frequency Identification (RFID) device according to one embodiment of the present invention includes a first microstrip antenna comprising a microstrip positioned towards a first side of the device, and a Radio Frequency- (RF-)reflective back plane spaced from the microstrip of the first microstrip antenna; a second microstrip antenna comprising a microstrip positioned farther from the first side of the device than the microstrip of the first microstrip antenna, and an RF-reflective back plane spaced from the microstrip of the second microstrip antenna; and circuitry for receiving signals from the first and second microstrip antennas, wherein the first and second microstrip antennas are each independently coupled to the circuitry.
15 Citations
20 Claims
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1. A Radio Frequency Identification (RFID) device, comprising:
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a first microstrip antenna comprising a microstrip positioned towards a first side of the device, and a Radio Frequency- (RF-)reflective back plane spaced from the microstrip of the first microstrip antenna; a second microstrip antenna comprising a microstrip positioned farther from the first side of the device than the microstrip of the first microstrip antenna, and an RF-reflective back plane spaced from the microstrip of the second microstrip antenna; and circuitry for receiving signals from the first and second microstrip antennas, wherein the first and second microstrip antennas are each independently coupled to the circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A Radio Frequency Identification (RFID) device, comprising:
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a first microstrip antenna comprising a microstrip positioned towards a first side of the device, and a Radio Frequency- (RF-)reflective back plane spaced from the microstrip of the first microstrip antenna; a second microstrip antenna comprising a microstrip positioned farther from the first side of the device than the microstrip of the first microstrip antenna, and an RF-reflective back plane spaced from the microstrip of the second microstrip antenna; and circuitry for receiving signals from the first and second microstrip antennas; and a battery coupled to the circuitry, wherein the first and second microstrip antennas are each independently coupled to the circuitry, wherein the signals from the first and second microstrip antennas are not combined in RF. - View Dependent Claims (16, 17, 18, 19)
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20. A Radio Frequency Identification (RFID) device, comprising:
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a first microstrip antenna comprising a microstrip positioned along a first side of the device, and a Radio Frequency- (RF-)reflective back plane spaced from the microstrip of the first microstrip antenna; a second microstrip antenna comprising a microstrip positioned along a second side of the device, and an RF-reflective back plane spaced from the microstrip of the second microstrip antenna; and circuitry for receiving signals from the first and second microstrip antennas. wherein the first and second microstrip antennas are each independently coupled to the circuitry wherein the sides lie along parallel planes.
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Specification