Abstract: A radio frequency identification (RFID) device is arranged for use with a remote interrogator unit. The RFID device comprises an integrated circuit configured to send, in response to a signal received from the remote interrogator unit or automatically, a responsive signal which includes identification information. A communication antenna is electrically coupled to the integrated circuit and is provided for wireless communication with the remote interrogator unit. At least one photovoltaic cell is provided for converting radiation into electrical energy and providing power to the integrated circuit. The photocell may be designed to form all or part of the RF antenna of the RFID device.

Abstract: A radio frequency identification (RFID) device is arranged for use with a remote interrogator unit. The RFID device comprises an integrated circuit configured to send, in response to a signal received from the remote interrogator unit or automatically, a responsive signal which includes identification information. A communication antenna is electrically coupled to the integrated circuit and is provided for wireless communication with the remote interrogator unit. At least one photovoltaic cell is provided for converting radiation into electrical energy and providing power to the integrated circuit. The photocell may be designed to form all or part of the RF antenna of the RFID device.

Abstract: An RFID tag includes a matching circuit connected between the antenna and the ASIC. The matching circuit rotates the load impedance of the ASIC to provide optimal impedance matching between the antenna and the ASIC over a wide range of operating frequencies. The matching circuit includes a capacitor, first and second microstrips, and a capacitor connected in series. Another capacitor connects ground to a node between the first capacitor and the first microstrip.

Abstract: A RFID tag to be attached to an object to identify the object or a characteristic or feature thereof from data stored in the tag accessible by a RFID reader includes a relatively flat structure having a small aperture antenna positioned on or proximate the tag in the form of a polygon having electrically conductive sides. The flat structure, which may be fabricated as a sticker or label, incorporates a small aperture antenna, such as a slot antenna, in the form of a polygon having electrically conductive sides. The polygon may be triangular, rectangular, square, elliptical, circular, or other polygonal figure depending on number of its plurality of sides. A constitutes the aperture of the antenna.

Abstract: A method and apparatus for protecting wireless communication systems from ESD/surge is disclosed. A capacitor is connected in series with a shunt resonating circuit and inserted between a transceiver and outside antenna of the wireless communication system. The shunt resonating circuit may include a shunt inductor in parallel with a shunt capacitor. A resistor may be connected in series between the shunt inductor and the shunt capacitor. The shunt resonating circuit acts like an open circuit with high impedance, and also acts like a short circuit with low impedance at operating frequency bands of the transceiver. The capacitor provides additional protection for the transceiver against low frequency spectrum by acting like a high pass filter.

Abstract: A method and apparatus for maintaining sensitivity of a homodyne receiver over varying transmitter power levels is disclosed. The method includes adjusting output power levels of a transmitter driver. A bias supply voltage to the transmitter driver may be adjusted to adjust the output power levels. A control voltage to the transmitter driver may be adjusted to adjust the output power levels of the transmitter driver. A homodyne radio frequency tag reader may include the method.

Abstract: A position signal generating circuit which is operated by a position controller for generating first and second determining signals, a rotation direction selection signal and an enable signal, the circuit including: a pulse generator for generating a basic pulse; a gate circuit for logic-operating the basic pulse from the pulse generator and the first and second mode determining signals from the position controller to output signals indicating the logic-operated results; and a rotation direction determining unit for combining the signals output from the gate circuit according to the rotation direction selection signal from the position controller to generate a position control signal. A desired position control signal can be generated by using simplified hardware and software without an additional selection switch.