Abstract: There is disclosed a multiplexer comprising: a first port; a second port; a third port connected to the first port and the second port; a fourth port connected to the first port and the second port; and a transformer connected at the first port, and having a first winding connected between the first port and one of the third and fourth ports and a second winding connected to the other of the third and fourth ports and electrical ground, wherein one of the first to fourth ports is for connection to an antenna, the multiplexer further comprising: a transmit filter connected between the port for connection to the antenna and one of ports to which that port is connected; and a receive filter connected between the port for connection to the antenna and the other of the ports. A cancellation circuit connected between the third and fourth ports, comprises a plurality of parallel channels between the second receive and transmit filters, each channel including a filter.

Abstract: A multiple input, multiple output, MIMO, antenna arrangement comprising: a transmit hybrid circuit connected to receive first and second transmit signals, and to output a sum of the first and second transmit signals, and to output a difference of the first and second transmit signals, a first antenna connected to receive the output sum; a second antenna connected to receive the output difference; a receive hybrid circuit connected to receive signals from the first and second antennas, and to output a sum of the signals from the first and second antennas, and to output a difference of the first and second antenna signals; a first cancellation circuit connected to receive the first transmit signal and configured to compensate for the interference due to the first transmit path; a second cancellation circuit connected to receive the second transmit signal and configured to compensate for the interference due to the second transmit path; wherein: the sum output of the receive hybrid circuit and the output of the

Abstract: There is described a circuit for transmitting a transmit signal at a transmit frequency and receiving a receive signal at a receiver frequency, for use with a common antenna, comprising: a first signal junction having a transmit port for receiving the transmit signal, a receive port for outputting the receive signal, a third port and a fourth port, wherein the third and fourth port are for outputting a pair of common mode or differential mode transmit signals which are split from the transmit signal at the transmit port, and for receiving a pair of common mode or differential mode receive signals which are combined and provided to the receive port; a second signal junction having an antenna port for connection to an antenna, a second port and a third port, wherein the second and third port are for outputting the pair of common mode or differential mode receive signals which are split from the signal received at the antenna port, and for receiving the pair of common mode or differential mode transmit signals w

Abstract: An apparatus includes a receiver chain includes an input node and a transmitter chain comprising a tap and output nodes. An auxiliary transmitter chain comprises an auxiliary input node coupled to the tap node, an adaptive filter unit and a signal output coupled to the input node. The filter unit includes an interpolation processor, and an adaptive filter and a coefficient processor coupled to the receiver chain and the adaptive filter. The transmitter chain generates a first waveform comprising a plurality of frequency-separated signals. Contemporaneously, the auxiliary chain applies a second waveform comprising another plurality of frequency-separated signals at the input node. The receiver chain receives a composite waveform comprising a waveform coupled from the output node and the second waveform. The first waveform lacks signals required for determination of coefficients of the filter whose frequencies coincide with the another plurality of signals of the second waveform.

Abstract: An apparatus includes a receiver chain includes an input node and a transmitter chain comprising a tap and output nodes. An auxiliary transmitter chain comprises an auxiliary input node coupled to the tap node, an adaptive filter unit and a signal output coupled to the input node. The filter unit includes an interpolation processor, and an adaptive filter and a coefficient processor coupled to the receiver chain and the adaptive filter. The transmitter chain generates a first waveform comprising a plurality of frequency-separated signals. Contemporaneously, the auxiliary chain applies a second waveform comprising another plurality of frequency-separated signals at the input node. The receiver chain receives a composite waveform comprising a waveform coupled from the output node and the second waveform. The first waveform lacks signals required for determination of coefficients of the filter whose frequencies coincide with the another plurality of signals of the second waveform.

Abstract: A duplexing apparatus comprises a reference of impedance settings and corresponding calibration measurements. A controller is arranged to set a variable impedance to a first impedance setting and transmit a first transmit signal at a first transmit frequency and measure a resulting first signal at an output node of a hybrid circuit. The controller then selects a second impedance setting, transmits a second transmit signal at a second transmit frequency and measures a resulting second signal at the output node. The controller then determines a balancing result using a system of equations associating the first and second measured signals, and first and second calibration measurements from the reference in respect of the first and second impedance settings, respectively. A third impedance setting is retrieved from the reference by reference to the balancing result to provide isolation of an input node from the output node of the hybrid circuit.

Abstract: A duplexing apparatus comprises a reference of impedance settings and corresponding calibration measurements. A controller is arranged to set a variable impedance to a first impedance setting and transmit a first transmit signal at a first transmit frequency and measure a resulting first signal at an output node of a hybrid circuit. The controller then selects a second impedance setting, transmits a second transmit signal at a second transmit frequency and measures a resulting second signal at the output node. The controller then determines a balancing result using a system of equations associating the first and second measured signals, and first and second calibration measurements from the reference in respect of the first and second impedance settings, respectively. A third impedance setting is retrieved from the reference by reference to the balancing result to provide isolation of an input node from the output node of the hybrid circuit.

Abstract: The invention provides duplexing apparatus, wireless devices and methods for duplexing signals in which measurements are taken at multiple frequencies across a frequency band of interest, and in which a balancing impedance is controlled as a function of those measurements. Isolation between the RX and TX nodes is enhanced across the frequency band as a result.

Abstract: The invention provides duplexing apparatus, wireless devices and methods for duplexing signals in which measurements are taken at multiple frequencies across a frequency band of interest, and in which a balancing impedance is controlled as a function of those measurements. Isolation between the RX and TX nodes is enhanced across the frequency band as a result.

Abstract: The present invention encompasses topical oral care compositions comprising the combination of an anti-bacterial agent with an anti-inflammatory agent in an orally acceptable carrier for effective treatment and prevention of bacteria-mediated diseases and conditions in the oral cavity and for modulating host reaction to bacterial pathogens present in the oral cavity and to the toxins, endotoxins, inflammatory cytokines and mediators released by or prompted by these pathogens. The present invention also encompasses methods of use of these compositions comprising topical application to the oral cavity. The benefits of the present compositions and methods extend beyond treating and preventing oral bacterial infections in the oral cavity to promoting whole body or systemic health.