An apparatus comprising includes first and second radio frequency circuitry configured for operation at least in one or more first and second radio frequency bands, respectively; and first and second antenna arrangements configured for operation in the one or more first and second radio frequency bands, respectively. The apparatus also includes first and second radio frequency coupling for transferring of a signal between the first and second antenna arrangements, respectively, and the first and second radio frequency circuitry, respectively. The apparatus further includes a controller for assessing whether a signal can be transferred between the second antenna arrangement and the first radio frequency circuitry and, in dependence upon the assessment, for transferring the signal therebetween, via a frequency converter configured to enable, for the signal, frequency conversion between the one or more second radio frequency bands and the one or more first radio frequency bands.

A radio-frequency module includes a first base, which has at least a part formed of a first semiconductor material and which includes a low-noise amplifier circuit, a second base, which has at least a part formed of a second semiconductor material having a thermal conductivity lower than that of the first semiconductor material and which includes a power amplifier circuit, and a module substrate, which has a principal surface on which the first base and the second base are disposed. The first base is joined to the principal surface with electrodes interposed in between. The second base is disposed between the module substrate and the first base in cross-sectional view, and is joined to the principal surface with an electrode interposed in between. At least a part of the first base overlaps at least a part of the second base in plan view.

Proposed is a radio frequency (RF) multiplexer of a 5G mmWave low-loss broadband wireless hybrid type using a waveguide cavity Ka-band in which outputs of a mobile communication band communication system using a plurality of satellite frequencies are combined, thereby reducing an insertion loss and increasing passive inter-modulation distortion (PIMD) performance, and signals at adjacent frequencies in a 5G mobile communication band are effectively filtered using a single mode or multiple modes, thereby reducing a size of a filter to reduce a weight thereof. The RF multiplexer of the 5G mmWave low-loss broadband wireless hybrid type using the waveguide cavity Ka-band includes bandpass filters which may receive signals in an RF frequency band to perform tuning and a coupler which combines outputs of at least two bandpass filters to match an antenna.

A system for monitoring cellular communications including a passive sensor device, processors, and memory devices. The memory devices having instructions that cause the processors to identify active downlink channels using a first radio to monitor each channel in a cellular spectrum and store downlink channel information, including configuration data, for each of the identified active downlink channels. The processors identify active uplink channels using a second radio to monitor each channel in the cellular spectrum and store uplink channel information for each of the identified active uplink channels. The processors correlate one of the active uplink channels with a corresponding active downlink channel and tune a third radio to the active uplink channel using the configuration data for the corresponding active downlink channel. The processors also tune a fourth radio to the active downlink channel corresponding to the at least one active uplink channel using the corresponding configuration data.

A communication management resource implements an iterative process to derive settings for digital precoder W, analog precoder A, and decode function D with a bandwidth-limited fronthaul link between the application of digital precoder W and the application of analog precoder A. The iterative process includes: for a first instance of digital precoder W and decode function D, optimize an instance of the analog precoder A; and based on the optimized instance of the analog precoder A, optimize a second instance of the digital precoder W and the decode function D. In one implementation, for each iteration of multiple iterations, the communication management resource: i) optimizes an instance of the analog precoder A based on an instance of the digital precoder W and the decode function D, and ii) optimizes an instance of the digital precoder W and the decode function D based on the instance of the analog precoder A.

According to the present disclosure there is provided a front end module comprising a bandpass filter, an antenna port for connection to an antenna and forming a signal path with the bandpass filter, and one or more amplifiers. The one or more amplifiers are disposed between the bandpass filter and the antenna port in the signal path. A corresponding wireless device and wireless access point are also provided.

Aspects of this disclosure relate to a radio frequency system with an antenna, a radio frequency amplifier, and parallel acoustic wave filters. The parallel acoustic wave filters can each be a band pass filter having a passband and resonator area. The passbands of the parallel acoustic filters can be overlap in an overlap band. One of the parallel acoustic wave filters can have a smaller resonator area than another of the parallel acoustic wave filters.

A transmitter apparatus and method are disclosed. An RF terminal provides an RF signal. A first antenna transmits a first portion of the RF signal and a second antenna transmits a second portion of the RF signal. Directional couplers generate a first monitoring signal and a second monitoring signal. A power comparison operational amplifier receives the first monitoring signal and the second monitoring signal and generates a power difference signal. A phase control operational amplifier receives the power difference signal and a reference input signal and generates a phase control signal. A phase shifter receives the phase control signal, and based on the phase control signal, phase-shifts the RF signal to direct the RF signal to the first antenna, or phase-shifts the RF signal to direct the RF signal to the second antenna.

With advanced compute capabilities and growing convergence of wireless standards, it is desirable to run multiple wireless standards, e.g., 4G, 5G NR, and Wi-Fi, on a single signal processing system. Automatic gain control (AGC) is a process of converging on a gain level for optimum signal reception considering the dynamic range of all the components in the receive chain, including analog and digital parts. For certain wireless standard such as Wi-Fi, AGC is required to complete within a short interval. Both RF and baseband gains have to be adjusted within this short time. Discloses in the present disclosure are embodiments of a high-speed and low pin-count interface between an RF circuit and a baseband circuit for AGC communication. The high-speed interface provides a light-weight serial protocol over one or more low-voltage differential signaling (LVDS) channels to meet a low-latency requirement for gain updates.

Embodiments of the present invention comprise a signal processing method and apparatus for use in a satellite payload in which an input RF signal received at a receiver antenna is modulated by using a single optical carrier at the input of an optical modulator. The optical domain signal is processed and is subsequently combined with a single unmodulated optical LO tone to provide an output RF signal for radiation by a transmitter antenna or for further digital processing by an on-board processor. This results in a clean generation of the frequency-converted RF signal at the output of the opto-electrical conversion stage.