Abstract: The present application provides a method and a circuit for determining an additional maximum power reduction for conforming to emission requirements for dual carrier operation, where each carrier has an associated respective one of multiple different radio access technologies, and where each of the multiple different radio access technologies uses a different antenna. The method includes associating in a wireless communication device each one of at least a pair of antennas with a different radio access technology for supporting communications between the wireless communication device and at least a first wireless network. An amount of isolation is identified between the at least pair of antennas. A minimum level of the additional is maximum power reduction needed for conforming to the emission requirements is determined, based on the identified amount of isolation.

Abstract: The present application provides a method and a circuit for determining an additional maximum power reduction for conforming to emission requirements for dual carrier operation, where each carrier has an associated respective one of multiple different radio access technologies, and where each of the multiple different radio access technologies uses a different antenna. The method includes associating in a wireless communication device each one of at least a pair of antennas with a different radio access technology for supporting communications between the wireless communication device and at least a first wireless network. An amount of isolation is identified between the at least pair of antennas. A minimum level of the additional is maximum power reduction needed for conforming to the emission requirements is determined, based on the identified amount of isolation.

Abstract: The present application provides an antenna switching circuit, a wireless communication device and a method for switching a transmit path of a transceiver between three or more antennas. The antenna switching circuit includes three or more antennas, and a switch coupled to each of the three or more antennas. The antenna switching circuit further includes a controller coupled to the switch, as well as a transceiver, which is coupled to each of the three or more antennas via the switch. Each of the coupled antennas is selectively associated with a different respective receive path of the transceiver, and the transceiver has a transmitter path that can be separately selectively coupled to any one of the three or more antennas via the switch under the control of the controller.

Abstract: A first antenna and a first band switch with a first duplexer operatively coupled to a first output of the first band switch. The first duplexer provides a transmit sub-band feed and a first receive sub-band feed for a first RF band. A second duplexer is operatively coupled to a second output of the first band switch, and provides a transmit sub-band feed and a first receive sub-band feed for a second RF band. A second antenna is operatively coupled to an input of a second band switch. A first antenna matching network for the second antenna is operatively coupled to a first output of the second band switch, and provides a second receive sub-band feed for the first RF band. A second antenna matching network is operatively coupled to a second output of the second band switch, and provides a second receive sub-band feed for the second RF band.

Abstract: A first antenna and a first band switch with a first duplexer operatively coupled to a first output of the first band switch. The first duplexer provides a transmit sub-band feed and a first receive sub-band feed for a first RF band. A second duplexer is operatively coupled to a second output of the first band switch, and provides a transmit sub-band feed and a first receive sub-band feed for a second RF band. A second antenna is operatively coupled to an input of a second band switch. A first antenna matching network for the second antenna is operatively coupled to a first output of the second band switch, and provides a second receive sub-band feed for the first RF band. A second antenna matching network is operatively coupled to a second output of the second band switch, and provides a second receive sub-band feed for the second RF band.

Abstract: A communications device may include a first transmit path having a first band pass filter operating at a first frequency band having a first bandwidth, and a second transmit path having a second band pass filter operating at a second frequency band having a second bandwidth. The second frequency band may be adjacent the first frequency band and the second bandwidth may be less than the first bandwidth. The communications device may include a third receive path operating at a third frequency band having a third bandwidth, and a fourth receive path operating at a fourth frequency band having a fourth bandwidth. The fourth frequency band may be adjacent the third frequency band, and the fourth bandwidth may be less than the third bandwidth.

Abstract: A mobile wireless communications device may include transmit paths operating on respective different frequency bands, an antenna, and an antenna switch between the transmit paths and the antenna. The device may include a harmonic filter attenuating a harmonic frequency of a first frequency band of a first transmit path, and also attenuating a second frequency band of a second transmit path; a filter switch between the harmonic filter and the antenna; and a processor. The processor may selectively control the antenna switch and the filter switch so that when the antenna switch couples the first transmit path to the antenna, the filter switch couples the harmonic filter to the antenna, and when the filter switch couples the second transmit path to the antenna, the filter switch decouples the harmonic filter from the antenna.

Abstract: A mobile wireless communications device may include transmit paths operating on respective different frequency bands, an antenna, and an antenna switch between the transmit paths and the antenna. The device may include a harmonic filter attenuating a harmonic frequency of a first frequency band of a first transmit path, and also attenuating a second frequency band of a second transmit path; a filter switch between the harmonic filter and the antenna; and a processor. The processor may selectively control the antenna switch and the filter switch so that when the antenna switch couples the first transmit path to the antenna, the filter switch couples the harmonic filter to the antenna, and when the filter switch couples the second transmit path to the antenna, the filter switch decouples the harmonic filter from the antenna.

Abstract: A communications device may include a first transmit path having a first band pass filter operating at a first frequency band having a first bandwidth, and a second transmit path having a second band pass filter operating at a second frequency band having a second bandwidth. The second frequency band may be adjacent the first frequency band and the second bandwidth may be less than the first bandwidth. The communications device may include a third receive path operating at a third frequency band having a third bandwidth, and a fourth receive path operating at a fourth frequency band having a fourth bandwidth. The fourth frequency band may be adjacent the third frequency band, and the fourth bandwidth may be less than the third bandwidth.