Abstract: A door/window opening detector including an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, the second resonant frequency being different from the first resonant frequency, the antenna having the first resonant frequency when in proximity to a door/window having a given dielectric constant and the second resonant frequency when not in proximity to a door/window having the given dielectric constant, and an alarm indication generator operable, in response to receiving an indication that a resonant frequency of the antenna has changed from the first resonant frequency to the second resonant frequency, for generating an alarm indication of opening of the door/window.

Abstract: A door/window opening detector including an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, the second resonant frequency being different from the first resonant frequency, the antenna having the first resonant frequency when in proximity to a door/window having a given dielectric constant and the second resonant frequency when not in proximity to a door/window having the given dielectric constant, and an alarm indication generator operable, in response to receiving an indication that a resonant frequency of the antenna has changed from the first resonant frequency to the second resonant frequency, for generating an alarm indication of opening of the door/window.

Abstract: A door/window opening detector including an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, the second resonant frequency being different from the first resonant frequency, the antenna having the first resonant frequency when in proximity to a door/window having a given dielectric constant and the second resonant frequency when not in proximity to a door/window having the given dielectric constant, and an alarm indication generator operable, in response to receiving an indication that a resonant frequency of the antenna has changed from the first resonant frequency to the second resonant frequency, for generating an alarm indication of opening of the door/window.

Abstract: A door/window opening detector including an antenna having at least a first resonant frequency and a second resonant frequency associated therewith, the second resonant frequency being different from the first resonant frequency, the antenna having the first resonant frequency when in proximity to a door/window having a given dielectric constant and the second resonant frequency when not in proximity to a door/window having the given dielectric constant, and an alarm indication generator operable, in response to receiving an indication that a resonant frequency of the antenna has changed from the first resonant frequency to the second resonant frequency, for generating an alarm indication of opening of the door/window.

Abstract: An antenna arrangement (200) and communication device (500) using the antenna arrangement connect a plurality of transceivers (302, 304) to a plurality of antenna elements (314, 316) and switches connections between the transceivers and the antenna elements depending on which transceiver has primary transmit control. The antenna elements include a transmit antenna element (316) and a monitoring antenna element (314). The transceiver having primary transmit control is connected to the transmit antenna element and the transceiver not having primary transmit control is connected to the monitoring antenna element.

Abstract: An antenna arrangement (200) and communication device (500) using the antenna arrangement connect a plurality of transceivers (302, 304) to a plurality of antenna elements (314, 316) and switches connections between the transceivers and the antenna elements depending on which transceiver has primary transmit control. The antenna elements include a transmit antenna element (316) and a monitoring antenna element (314). The transceiver having primary transmit control is connected to the transmit antenna element and the transceiver not having primary transmit control is connected to the monitoring antenna element.

Abstract: A loading of a twisted folded monopole (LTFM) includes a first antenna portion and a second antenna portion. The first and second antenna portions are mutually coupled to support a lower band for wireless communications. The LTFM also includes a third antenna portion and a fourth antenna portion. The third and fourth antenna portions generate self resonance in a higher band for wireless communications.

Abstract: A wireless communication unit (400) comprises a dual-port modulator for generating a radio frequency signal. A digital to analogue converter (446), operably coupled to a data generator (570), converts digital data to an analogue signal to be used in generating the radio frequency signal. An attenuator (450), operably coupled to the digital to analogue converter (446) attenuates the analogue signal output from the digital to analogue converter (446). A signal processor (402) is operably coupled to the attenuator (450) for setting an attenuation value of the attenuator (450) to balance signals input to the two ports of the dual-port modulator.

Abstract: A radio is described having a synthesizer (17) and a VCO (18). Each of the synthesizer and the VCO has a connection to a ground plane (13) of the radio. The ground plane connection of the VCO has a first capacitor (43) and a further ground connection (40) is provided between the VCO and the synthesizer for providing a common baseband ground for the VCO and the synthesizer, isolated with respect to baseband frequency currents in the ground plane of the radio. The arrangement addresses problems arising in radios having power amplifiers with severe output amplifier variations, such as are found in linear radios.

Abstract: This invention relates to a radio transmitter having a power amplifier and a linearizer arrangement, for example Cartesian feedback, for compensating for non-linearity in the power amplifier. A training signal is applied to the amplifier (36) and the linearizer arrangement is adjusted during a training mode of operation. In one embodiment, a look-up table (23) is provided for storing predetermined operating condition adjustment parameters. According to an operating condition input (e.g. frequency, temperature) control means (21) select operating condition adjustment parameters during the training mode and adjust the training signal to compensate for loop gain variations during the training mode. Automatic gain control (26) may be provided in the amplifier loop for activation during at least a portion of the training mode of operation to maintain constant closed loop gain.