Abstract: A method for testing a radio front-end begins by biasing a balun at a center tap of a secondary winding, where the secondary winding is coupled to a transmit power amplifier output and the biasing causes the transmit power amplifier to produce a partially activated power amplifier output. The method continues, by measuring one or more signal parameters of the radio front-end in response to the partially activated power amplifier output, and producing, based on the one or more signal parameters, one or more test results for the radio front-end. The method then continues by correlating the one or more test results to one or more predetermined test values.

Abstract: A structure includes a first face with at least one first aperture and a second face with a plurality of second apertures. The at least one first aperture is connected to the second apertures via through-holes embedded in the structure and having an electrically conducting inner wall and configured to form a waveguide medium for carrying radio frequency, RF, signals between the at least one first aperture and the plurality of second apertures. The at least one first aperture is configured to interface with at least one first external RF circuitry for processing RF signals and the plurality of the second apertures are arranged to interface with a plurality of second external RF circuitries for transmission and/or reception of RF signals. Embodiments may relate to a radio frequency, RF, communication device employing the structure.

Abstract: A radio transceiver includes a plurality of spatially separated radiating elements and a plurality of radio frequency front-ends, where each radiating element is associated with a radio frequency front-end of a plurality radio frequency front-ends. The radio transceiver includes a plurality of received signal sensors, where each received signal sensor is coupled to one or more radiating elements and where each received signal sensor is adapted to output a signal representative of a received signal strength for the one or more radiating elements. The radio transceiver further includes one or more processors coupled to the received signal sensors and adapted to receive the signal representative of a received signal strength from each received signal sensor and is further adapted to provide a control signal for changing a power mode for a set of radio frequency front-ends of the plurality radio frequency front-ends based on the received signal strength signal.

Abstract: A method for calibrating a radio transceiver begins by injecting a low-frequency tone at a transmit power amplifier input of the radio transceiver, where the low frequency tone is at least an order of magnitude lower than the operating frequency of a local oscillator coupled to the transmitter input. The method continues by upconverting the low-frequency tone to produce a plurality of tones at a transmit power amplifier output and then determining which tone of the plurality of tones is a local oscillator feedthrough tone associated with a transmit power amplifier output and which tone of the plurality of tones is representative of an in-phase and quadrature (I/Q) imbalance associated with the transmit power amplifier output.

Abstract: A method for calibrating a radio transceiver begins by injecting a low-frequency tone at a transmit power amplifier input of the radio transceiver, where the low frequency tone is at least an order of magnitude lower than the operating frequency of a local oscillator coupled to the transmitter input. The method continues by upconverting the low-frequency tone to produce a plurality of tones at a transmit power amplifier output and then determining which tone of the plurality of tones is a local oscillator feedthrough tone associated with a transmit power amplifier output and which tone of the plurality of tones is representative of an in-phase and quadrature (I/Q) imbalance associated with the transmit power amplifier output.