A power supply apparatus for a power amplifier includes a converter configured to convert input power into driving power for the power amplifier, a detector configured to transfer the driving power from the converter to the power amplifier, including an inductor formed on a detection path of the driving power, and configured to detect power information regarding the driving power to generate a detected signal, and a controller configured to control power conversion of the converter based on an envelope signal of a signal input to the power amplifier and the detected signal.

A reduced profile panel antenna is disclosed. A panel antenna configured according to an embodiment includes two opposing antenna arms disposed over a ground plane. The antenna arms include one or more corrugated or folded sections to increase the electrical path of the antenna arms within fixed physical dimensions (e.g., length and width) of the panel antenna. The panel antenna also includes passive filters to provide current loop paths of varying lengths for selected frequency ranges. Longer loop paths are employed for signals at lower frequencies (i.e., longer wavelengths) and shorter loop paths are employed for signals at higher frequencies (i.e., shorter wavelengths). The panel antenna further includes a ferrite plane disposed between the ground plane and the antenna arms to suppress radio frequency (RF) signal reflections and allow for a reduced antenna profile or thickness.

A radio frequency amplification processing circuit includes: a radio frequency power amplifier, a transmitting antenna and a filter element; the radio frequency power amplifier is configured to perform radio frequency amplification on a modulated first wireless communication signal, and transmit, with a first line, the amplified first wireless communication signal to the transmitting antenna for transmission, or perform radio frequency amplification on a modulated second wireless communication signal, and transmit, with a second line, the amplified second wireless communication signal to the filter element; and the filter element is configured to filter the amplified second wireless communication signal, and transmit, also with the second line, the filtered second wireless communication signal to the transmitting antenna for transmission.

A radio frequency amplification processing circuit includes: a radio frequency power amplifier, a transmitting antenna and a filter element; the radio frequency power amplifier is configured to perform radio frequency amplification on a modulated first wireless communication signal, and transmit, with a first line, the amplified first wireless communication signal to the transmitting antenna for transmission, or perform radio frequency amplification on a modulated second wireless communication signal, and transmit, with a second line, the amplified second wireless communication signal to the filter element; and the filter element is configured to filter the amplified second wireless communication signal, and transmit, also with the second line, the filtered second wireless communication signal to the transmitting antenna for transmission.

A wide modulation bandwidth radio frequency (RF) circuit is provided. In examples discussed herein, the RF front-end circuit includes a tracker circuit configured to generate a modulated voltage at a wide modulation bandwidth. The modulated voltage can be used by an amplifier circuit(s) for amplifying an RF signal(s). Notably, the tracker circuit may have inherent frequency-dependent impedance that can interact with a load current of the amplifier circuit(s) to cause degradation in the modulated voltage, which can further lead to distortions in an RF offset spectrum. In this regard, a notch circuit is provided and configured to operate at an appropriate notch frequency and a notch bandwidth to filter the modulated voltage in the RF offset spectrum. As a result, it may be possible to reduce the distortions caused by the modulated voltage degradation in the RF offset spectrum, thus helping to improve linearity and efficiency of the amplifier circuit(s).

There is disclosed a multiband antenna device comprising a conductive elongate antenna element configured for electrical connection to a groundplane at a grounding point, and a conductive elongate feeding element configured for electrical connection to a radio transmitter/receiver at a feeding point. At least a major portion of the antenna element is configured to extend in a first direction and to double back on itself in a second, substantially counter-parallel direction forming a slot. The feeding point is adjacent to the grounding point, and the feeding element is configured to extend substantially parallel to the first and second directions of the major portion of the antenna element. The antenna device can operate in multiple frequency bands, and can be configured on a dielectric insulating former that fits compactly in a corner of a mobile communications handset housing.

A method comprising interposing an interface device in communication with both a terminal and a meter; and using the interface device for, exchanging data with the terminal and the meter using a first protocol and a second protocol, respectively, at least one of which utilizes an RF field; identifying an originating device using the data from each of the terminal and the meter; and generating an output for use over the first protocol or the second protocol in response to the originating device.

An antenna device includes a ground conductor (1), a dielectric tube (2) containing an ionizing gas and passing through the ground conductor, whose folded-back portion (201) and both ends are disposed in different sides of the ground conductor, first electrodes (3, 4) disposed at both ends of the dielectric tube (2), a plasma excitation power supply connected to the first electrodes, bringing the ionizing gas into a plasma state; a second electrode (6) ring-shaped and disposed at the both ends side of dielectric tube (2) from the ground conductor (1), fitted to and in contact with the dielectric tube outer surface, a high frequency transmitter (7) supplying a high frequency signal to the second electrode (6), and a feed line (8) connecting the second electrode and the high frequency transmitter. Each end of the dielectric tube (2) is larger than the second electrode in the inner diameter.

Embodiments of radio frequency (RF) systems include a plurality of power amplifiers having a primary winding and a secondary winding. Each of the power amplifiers may be configured to process signals of different frequency bands. The primary winding for one power amplifier can be detuned while another power amplifier is being used in a transmit mode. By detuning the power amplifier, power coupling from the transmitting power amplifier can be reduced or eliminated.

One or more beamsteering matrices are applied to one or more signals to be transmitted via multiple antennas. After the one or more beamsteering matrices are applied to the one or more signals, the plurality of signals is provided to a plurality of power amplifiers coupled to the multiple antennas. Signal energies are determined for the plurality of signals provided to the plurality of power amplifiers, and relative signal energies are determined based on the determined signal energies. Output power levels of the plurality of power amplifiers are adjusted based on the determined relative signal energies.