An RF filter comprising a resonator element and a polymer composition is provided. The polymer composition contains an aromatic polymer and has a melting temperature of about 240° C. or more. The polymer composition exhibits a dielectric constant of about 5 or less and dissipation factor of about 0.05 or less at a frequency of 10 GHz.

A wireless device includes a phase control circuit and an antenna element. The phase control circuit configured to control each of phases frequencies of the plurality of transmission signals according to a transmission direction of which each the plurality of transmission signals is output, up-convert each frequencies of the plurality of transmission signals of which the phase is controlled. The antenna element configured to radiate a signal obtained by combining the upconverted plurality of transmission signals.

An independent tuning system for an antenna, a tuning method, and a communication device are disclosed. The independent tuning system for the antenna is applicable to a communication device. The communication device includes an antenna tuner, a tuning driver and a tuning program. The tuning program includes: a storage component, an input component, a matching component, and a tuning component. A tuning parameter corresponding to optimized antenna efficiency is matched according to a tuning parameter input by a user and a graph or curve chart of correspondence information between tuning parameters and antenna efficiency stored in the tuning component. An NV value of the tuning driver is tuned according to the tuning parameter to achieve independent optimized tuning of the antenna.

Carrier aggregation circuit having multi-stage filter combination. In some embodiments, a carrier aggregation circuit can include a first combining stage configured to aggregate a first signal in a first path associated with a first band and a second signal in a second path associated with a second band to provide a first aggregated signal in a first combined path. The carrier aggregation circuit can further include a second combining stage configured to aggregate the first aggregated signal in the first combined path and a third signal in a third path associated with a third band to provide a second aggregated signal in a second combined path.

A power radio frequency (RF) switch used in wireless communication is disclosed. A boosted switching control signal, which swings between a boosted supply voltage in which a system supply voltage is boosted and a negative supply voltage in which a polarity of the system supply voltage is inverted, is applied to a gate of a high-voltage transistor. Further, a substrate control signal which is synchronized with the boosted switching control signal, and swings between the negative supply voltage and a reference voltage may be applied to a substrate of the high-voltage transistor thereof.

Isolation between a first path and a second path is improved. A radio frequency module is capable of operating in a first mode in which simultaneous transmission, simultaneous reception, or simultaneous transmission and reception using both a first filter and a second filter is possible, and in a second mode in which transmission or reception using only the first filter is possible. A first switching element is provided in a first path that is usable between an antenna terminal and the first filter in the first mode, and a second switching element is provided between the first path and a ground. A third switching element is provided in a second path that is usable between the antenna terminal and the first filter in the second mode, and a fourth switching element is provided between the second path and the ground. The radio frequency module further includes a phase shifter.

An impedance matching network for a radio frequency (RF) transmission system can include first port for coupling to a first transistor differential pair. The network can further include a second port for coupling to a second tansistor differential pair. The network can further incluede a matching network connected to the port and the second port, the matching network comprised of a pair of coupled lines. Other aspects are described.

A system that incorporates teachings of the present disclosure may include, for example, a communication device having a controller to provision a matching network that controls one or more operational characteristics of one of a receiver portion and a transmitter portion of the communication device according to a profile describing one or more characteristics of a communication system from which the communication device operates. Additional embodiments are disclosed.

Polyphase power amplifiers for load insensitivity are disclosed. In certain embodiments, a polyphase transmit system includes an intermediate frequency transceiver including a first complex mixer that outputs a plurality of intermediate frequency transmit signals of different phases, and an intermediate frequency to radio frequency module including a second complex mixer that generates a plurality of radio frequency transmit signals of different phases based on the plurality of intermediate frequency transmit signals, and a polyphase power amplifier that receives the plurality of radio frequency transmit signals and outputs an amplified radio frequency signal. The polyphase transmit system further includes an antenna that transmits the amplified radio frequency signal.

Communication terminals configured for satellite and terrestrial communications and methods of use are disclosed herein. In an embodiment, a communication terminal includes an antenna, a filter and filter control circuitry. The antenna is configured to receive a radio signal. The filter is configured to filter the radio signal to remove an interference signal. The filter control circuitry is configured to detect the interference signal present in the radio signal received by the antenna and cause an adjustment to the filter to block the interference signal. In another embodiment, the communication terminal includes an amplifier and gain control circuitry. The amplifier is configured to configured to amplify the radio signal. The gain control circuitry is configured to detect an interference signal present in the radio signal received by the antenna and cause an adjustment to the amplifier based on the detected interference signal.