Multifunction single antenna for contactless systems

摘要

A multifunction antenna is described in which the multifunction antenna is divided into a first segment and a second segment by an impedance circuit that produces low impedance at a low frequency and high impedance at a high frequency. A high frequency radio frequency (HF-RF) signal may be transmitted or received using only the first segment of the multifunction antenna from a HF-RF transceiver by blocking the HF-RF signal from the second segment by the impedance circuit. A low frequency radio frequency (LF-RF) signal may be received using both the first segment and the second segment of the multifunction antenna by passing the LF-RF signal through the impedance circuit.

主权项

1. A mobile device comprising:
an energy storage device configured to receive energy from a low frequency (LF) radio frequency (RF) signal; a high frequency (HF) RF transceiver coupled to a processing module, wherein the energy storage device is coupled to provide power to the storage module and to the HF-RF transceiver; and a multifunction antenna coupled to the HF-RF transceiver and coupled to the energy storage device, wherein one end of the multifunction antenna is grounded and the energy storage device is coupled to an opposite end of the multifunction antenna, and wherein the multifunction antenna is divided into a first segment and a second segment by a first impedance circuit and the HF-RF transceiver is coupled to the multifunction antenna adjacent to the first impedance circuit.