FM transmission using a RFID/NFC coil antenna
First Claim
1. An apparatus comprising:
- an antenna radiating element arranged as at least one coil and defining a first feed port and a second feed port at opposed ends of the antenna radiating element, in which the first and second feed ports are configured to interface a first radio to the antenna radiating element;
a third feed port disposed along the antenna radiating element substantially at one of a physical symmetry point and a radio frequency effective symmetry point between the first and the second feed ports, in which the third feed port is configured to interface a second radio to the antenna radiating element;
wherein the apparatus is free of filtering components for isolating different bands from one another, and wherein a relative location of the third feed port and the first and second feed ports provides band isolation.
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Accused Products
Abstract
An antenna radiating element is arranged as at least one coil and defines a first feed port and a second feed port at its opposed ends. There is a third feed port disposed along the antenna radiating element substantially at a radio frequency effective symmetry point between the first and the second radio feed ports. The first and second feed ports are for interfacing a first radio (e.g., RFID/NFC radio) to the antenna radiating element, and the third feed port is for interfacing a second radio (e.g., FM-TX) to the antenna radiating element. The antenna radiating element is configured to function simultaneously as a balanced coil antenna with respect to the first radio and as two parallel half-loop antennas with respect to the second radio.
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Citations
17 Claims
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1. An apparatus comprising:
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an antenna radiating element arranged as at least one coil and defining a first feed port and a second feed port at opposed ends of the antenna radiating element, in which the first and second feed ports are configured to interface a first radio to the antenna radiating element; a third feed port disposed along the antenna radiating element substantially at one of a physical symmetry point and a radio frequency effective symmetry point between the first and the second feed ports, in which the third feed port is configured to interface a second radio to the antenna radiating element; wherein the apparatus is free of filtering components for isolating different bands from one another, and wherein a relative location of the third feed port and the first and second feed ports provides band isolation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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providing an antenna radiating element arranged as at least one coil and defining a first feed port and a second feed port at opposed ends of the antenna radiating element, and further defining a third feed port disposed along the antenna radiating element substantially at one of a physical symmetry point and a radio frequency effective symmetry point between the first and the second radio feed ports; coupling a first radio to the first and second feed ports; and coupling a second radio to the third feed port; wherein the antenna radiating element is free of filtering components for isolating different bands from one another, and wherein a relative location of the third feed port and the first and second feed ports provides band isolation. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification