METHOD AND SYSTEM FOR RADIATED POWER CONTROL FOR SHORT RANGE RFID TAG READING
First Claim
1. A system for power control for Radio Frequency Identification (RFID) tag reading, comprising:
- a power amplifier for providing an RF transmit signal for the RFID tag reading, the RF transmit signal being provided to an antenna for radiating the transmit signal, power of the radiated transmit signal defining a read range for the RFID tag reading; and
an attenuator provided between the power amplifier and the antenna for controlling the power of the radiated transmit signal to adjust the read range.
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Accused Products
Abstract
A method and system for power control for Radio Frequency Identification (RFID) tag reading is provided. The system includes a power amplifier for providing an RF transmit signal for the RFID tag reading. The RF transmit signal is provided to an antenna for radiating the transmit signal. The power of the radiated transmit signal defining a read range for the RFID tag reading. The system includes an attenuator provided between the power amplifier and the antenna for controlling the power of the radiated transmit signal to adjust the read range. A handheld RFID reader may include the system. The method includes calibrating the output power of a reader having a power amplifier and an attenuator provided between the power amplifier and an antenna. The step of calibrating includes at least one of controlling power of the power amplifier in its linear region, and controlling attenuation level of the attenuator.
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Citations
24 Claims
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1. A system for power control for Radio Frequency Identification (RFID) tag reading, comprising:
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a power amplifier for providing an RF transmit signal for the RFID tag reading, the RF transmit signal being provided to an antenna for radiating the transmit signal, power of the radiated transmit signal defining a read range for the RFID tag reading; and an attenuator provided between the power amplifier and the antenna for controlling the power of the radiated transmit signal to adjust the read range. - 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. A method for power control for Radio Frequency identification (RFID) tag reading, comprising:
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calibrating the output power of a reader, the reader including a power amplifier for providing an RF transmit signal for the RFID tag reading, an antenna for radiating the transmit signal and an attenuator provided between the power amplifier and the antenna, the output power of the reader defining a read range for the RFID tag reading, the step of calibrating including at least one of the following steps; controlling power of the power amplifier in its linear region; and controlling attenuation level of the attenuator. - View Dependent Claims (23, 24)
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Specification