An amplifier of a transmitter includes an input that receives an input signal and generates an amplified signal at an output. A digital power meter is coupled to the input of the amplifier, generates an estimated amplified signal, and determines peak and average powers of the estimated amplified signal. An output power detector coupled to the output of the amplifier determines peak and average powers of the amplified signal. A controller coupled to the digital power meter and the output power detector determines an estimated crest factor based on the peak and average powers of the estimated amplified signal, an amplified crest factor based on the peak and average powers of the amplified signal, and an error vector magnitude based on the estimated and amplified crest factors. The controller, which is also coupled to the amplifier, then adjusts operation of the amplifier based on the error vector magnitude.

The invention relates to an electronic component for adapting a pre-set matched impedance for an antenna. The electronic component comprises 1) a capacitance measurement circuit for measuring capacitance of a sensor, wherein the measured capacitance is indicative of a use case of the antenna, 2) a Radio Frequency (RF) switch configured for electrically connecting at least one selected impedance to an RF output, wherein the at least one selected impedance is an impedance in a group of impedances having at least two elements, wherein the RF switch is capable of providing an electrical connection between any impedance in the group of impedances and the RF output, and wherein the at least one selected impedance is configured for adapting the pre-set matched impedance, and 3) a digital processor having access to at least one threshold and the measured capacitance. The digital processor is configured (i) to compare the measured capacitance of the sensor provided by the capacitance measurement circuit to the at least one threshold, (ii) to determine, based on the comparison, which impedance in the group of impedances is the at least one selected impedance, and (iii) to instruct the RF switch to provide an electrical connection between the at least one selected impedance and the RF output. The invention also relates to a method for adapting a pre-set matched impedance for an antenna.

A first primary line has a first node at one end and a third node at another end and transmits a radio-frequency signal between the first node and the third node. A second primary line has a second node at one end and a fourth node at another end and transmits a radio-frequency signal between the second node and the fourth node. A first secondary line has a portion connected to the second node and is electromagnetically coupled to the first primary line. The second secondary line has a portion connected to the first node and has another end connected to a portion of the first secondary line. The second secondary line is electromagnetically coupled to the second primary line. A first capacitor is connected in parallel to a portion of the second primary line or a portion of the second secondary line.

A multiplexer includes a first filter located between a common terminal and a first terminal to pass a signal in a first passband, and a second filter located between the common terminal and a second terminal to pass a signal in a second passband. A first series arm circuit included in the first filter includes a first series arm resonator and a second series arm resonator. The first series arm circuit is connected to the common terminal not through a circuit including an elastic wave resonator and a connecting point of the circuit. The first series arm circuit has a first antiresonance frequency and a second antiresonance frequency higher than the first antiresonance frequency. The second antiresonance frequency is higher than a higher edge of the first passband. The first antiresonance frequency is at or lower than a higher edge of the second passband.

A switching module assembly is provided. The switching module assembly includes a plurality of transmit/receive terminals, an antenna terminal, a shunt indictor coupled to the antenna terminal, a plurality of duplexers coupled to the plurality of transmit/receive terminals, and a plurality of impedance rotation elements coupled to the plurality of duplexers. Each duplexer corresponds to a signal frequency of a plurality of signal frequencies, and the impedance rotation elements are configured to adjust the impedance of each duplexer in conjunction with the shunt inductor to provide a resonant frequency at the signal frequency of each duplexer. The switching module can be used in the front-end module of a communications device, such as a mobile phone.

In many examples, a device comprises a transmitter. The transmitter comprises a power amplifier, a first transformer coil coupled to the power amplifier, and a second transformer coil adapted to be electromagnetically coupled to the first transformer coil. The transmitter also comprises a first bond wire coupled to a first end of the second transformer coil and adapted to be coupled to a first end of an antenna, a capacitor coupled to a second end of the second transformer coil, a switch coupled to the capacitor and configured to engage and disengage the capacitor from the transmitter, and a second bond wire coupled to the switch and adapted to be coupled to a second end of the antenna.

Devices and methods for detection of active return loss for an antenna element of a plurality of antenna elements of a phased array antenna are provided. An exemplary device can convert a voltage differential at an input of a power amplifier (PA) to first current. The device can convert a coupled voltage corresponding to a signal transmitted from the PA to a respective antenna element, to a second current. The device can convert a reflected voltage corresponding to a signal reflected from the respective antenna element, to a third current. The device can convert the first current, the second current, and the third current to an output voltage at a generator output. The device can further have a controller that can adaptively generate codebooks for transmission based on the output voltage.

The present invention discloses a millimeter-wave isolation device, comprising a first isolated circuit and a second isolated circuit and further comprising a millimeter-wave transceiver. An output end of the first isolated circuit is connected to an input end of the millimeter-wave transceiver. An output end of the millimeter-wave transceiver is connected to an input end of the second isolated circuit. The first isolated circuit and the second isolated circuit are isolated by virtue of the millimeter-wave transceiver. By adopting a short distance transmission mode with millimeter-waves taken as carrier waves, a bandwidth can reach 200 kHz to 20 GHz, and a transmission speed can reach 100 kbps to 10 Gbps. The speed is high, whereby the millimeter-wave isolation device can be applicable to any scenario. A millimeter-wave carrier wave antenna is small, and through the antenna, either wireless transmission or signal isolation can be achieved.

A wireless communication system includes a first wireless communication device installed on an installation surface of a vehicle and a second wireless communication device. The first wireless communication device includes an antenna and a sensor. The antenna includes a first conductor, a second conductor, one or more third conductors, a fourth conductor, and a feeding line. The first wireless communication device transmits a signal from the antenna to the second wireless communication device, based on information detected by the sensor.

A radio frequency module includes a mounting board, a power amplifier, a plurality of transmission filters, a first switch, an output matching circuit, a low-noise amplifier, and an external-connection terminal. The mounting board includes a first principal surface and a second principal surface on opposite sides of the mounting board. The first switch switches a connection between the power amplifier and the transmission filters. The output matching circuit is connected between the power amplifier and the first switch. The low-noise amplifier is disposed on the second principal surface of the mounting board. The external-connection terminal is disposed on the second principal surface of the mounting board. The power amplifier, the output matching circuit, the first switch, and the transmission filters are disposed on the mounting board in stated order in a direction that is orthogonal to a thickness direction of the mounting board.