Abstract: An RFID device including: electronic circuitry suitable for an RFID device comprising a radio frequency section; an antenna; a battery which provides the device with power; and at least one quarter wavelength transmission line coupled between the battery and one or both of the electronic circuitry and the antenna.

Abstract: A radio frequency identification (RFID) transponder comprising: an antenna comprising at least two connected dipoles, and having an input port feeding one of the dipoles; a conductive ground plane separated by a predetermined distance from the antenna by a dielectric; and a transponder electrically connected to the input port and operative to produce a response signal when the transponder receives a signal at a given frequency from the antenna.

Abstract: An RFID device including: electronic circuitry suitable for an RFID device comprising a radio frequency section; an antenna; a battery which provides the device with power; and at least one quarter wavelength transmission line coupled between the battery and one or both of the electronic circuitry and the antenna.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.

Abstract: A radio frequency (RF) device includes electronic circuitry having a radio frequency section and power connectors for electrically connecting the electronic circuitry to at least one power source for providing the device with power. At least one quarter wavelength transmission line is connected between the power connectors and the electronic circuitry and acts as a low-to-high impedance transformer at RF, while at low frequencies i.e. DC, it provides a physical connection. Thus, the transmission line section has substantially no effect on the DC connection between the power source and the device.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.

Abstract: The present invention is of an active RFID system configured for SIMPLEX two way communication based on conductive coupling, wherein two way communication is non-simultaneous and can operate on a single frequency comprising at least one capacitive coupling reader, wherein the reader is configured to transmit modulated or unmodulated RF electric signals and to receive and decode data transmitted by the transponder; at least one active capacitive coupling RFID transponder comprising at least one integrated circuit, which is arranged to store a code comprising information and which is configured for capacitive coupled RFID transponder application; at least one antenna configured to receive signal from the at least one reader, and transmit the transponder code comprising information; and at least one power source for providing energy to operate the at least one integrated circuit and transponder transmission; and at least one data processing device for processing the data received from the reader.

Abstract: In a security system, a method and apparatus for two-way frequency hopping communications between the control panel and each peripheral device which maintains channel synchronization through the assignment of fixed beacon frequencies for the transmission of synchronizing data. The use of frequency hopping provides high immunity to jamming and interference, reduced occurrence of multi-path phenomena, and allows for transmissions at a much higher output power than conventional fixed-frequency communications, to thus increase the effective range of the peripheral devices while providing effective and reliable two-way communications between the control panel and the peripheral devices. The invention also provides a large number of channels, which allows for actuators such as sirens, strobes and line seizing devices to be wireless in addition to sensors.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.

Abstract: A radio frequency transponder includes at least one battery, which is coupled to provide electrical power for operating the transponder and at least one antenna, which is configured to receive and backscatter RF interrogation radiation from an interrogation device. An integrated circuit is arranged to store a code including information and, powered only with energy provided by the battery, to vary a radiation characteristic of the antenna responsively to the code so as to modulate the information onto the backscattered radiation.