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;
an attenuator for attenuating the RF transmit signal output from the power amplifier, an attenuated transmit signal from the attenuator being provided to an antenna; and
a controller for controlling each of the power amplifier and the attenuator, the controller operating the power amplifier within a linear operation region of the power amplifier, independent of the operation of the attenuator,the attenuator being capable of reducing a field of view for the RFID tag reading to a greater extent than is possible by setting the power of the power amplifier to a minimum level in the linear operation region.
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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; an attenuator for attenuating the RF transmit signal output from the power amplifier, an attenuated transmit signal from the attenuator being provided to an antenna; and a controller for controlling each of the power amplifier and the attenuator, the controller operating the power amplifier within a linear operation region of the power amplifier, independent of the operation of the attenuator, the attenuator being capable of reducing a field of view for the RFID tag reading to a greater extent than is possible by setting the power of the power amplifier to a minimum level in the linear operation region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A handheld device comprising:
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an RFID reader including an analog RF section having a power amplifier for providing an RF transmit signal for the RFID tag reading; an antenna; and an external attenuator, for attenuating the RF transmit signal output from the power amplifier, connected to the analog RF section and the antenna, the RF reader including a controller for controlling the power amplifier and the attenuator, the controller operating the power amplifier in a linear operation region of the power amplifier, independent of the operation of the attenuator, the attenuator being capable of reducing a field of view for the RFID reader to a greater extent than is possible by setting the power of the power amplifier to a minimum level in the linear operation region. - View Dependent Claims (18, 19)
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20. A method for power control for Radio Frequency Identification (RFID) tag reading, comprising:
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setting a field of view of a handheld reader, the handheld reader including a power amplifier for providing an RF transmit signal for the RFID tag reading, and an attenuator for attenuating the RF transmit signal output from the power amplifier, an attenuated transmit signal from the attenuator being provided to an antenna; controlling the power amplifier, including; operating the power amplifier in a linear operation region of the power amplifier, independent of the operation of the attenuator; and controlling an attenuation level of the attenuator, including; enabling the attenuator to reduce a field of view for the RFID rag reading to a greater extent than is possible by setting the power of the power amplifier to a minimum level in the linear operation region. - View Dependent Claims (21, 22, 23, 24)
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Specification