73 results about "Load pull" patented technology

The invention relates to a device and method for researching the metallic hydrogen permeation behavior, in particular to a device and method for researching the hydrogen permeation behavior of metal subjected to dead-load pulling stress in a gaseous medium, and the device and method are used for researching the interactive influence of pulling stress and a gaseous environment on the metallic hydrogen permeation behavior. The device comprises a heating device, a stretching device, an electrolytic bath and a liquid / gas storage bottle. The method comprises the steps of: nickel-plating a single side of a test piece to be tested, and fixing the test piece between a lower opening of an anode pool and an upper opening of an environmental pool, wherein the nickel-plated layer of the test piece faces the environmental pool; and providing dead-load pulling stress for the test piece by the stretching device. An experimental medium in the anode pool is a NaOH solution. An experimental solution inthe environmental pool forms a gaseous medium environment under the action of water bath. The device and method provided by the invention can be used for researching the hydrogen permeation behavior of a metallic material subjected to dead-load pulling stress in the gaseous medium, the control of the magnitude of the pulling stress and the environment and atmosphere can be realized, and the deficiency that the influence of a stressed state and the gaseous environment on the metallic hydrogen permeation behavior cannot be measured through the traditional electrolytic bath is made up.

A mobile communication device and an impedance matching method thereof are provided. The mobile communication device includes an antenna, a power amplifier, a tunable matching circuit, a power detection circuit and a controller. The tunable matching circuit determines an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit. The power detection circuit detects a forward power of the RF signal entering the antenna and a reflected power of the antenna. The controller tunes the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range.

Device characterization performed with a test system including a fixture and multiple frequency dependent test boards. In one embodiment, testing is performed with multiple sets of input and output test boards wherein each set is frequency dependent at different frequencies. In some examples, the test board includes an impedance transformer that is a quarter wave length of the fundamental frequency (f0) of a frequency of which the board is dependent. In some examples, S-parameters and load pull measurements are obtained for the device under test with the test boards at different frequencies.

The invention provides a device parameter measurement method and device and terminal equipment. The method comprises the steps of obtaining measured data of a to-be-measured device and an error parameter of a load pull measurement system, wherein the measured data is a voltage wave measured by an internal receiver of a vector network analyzer in the load pull measurement system on the basis of theto-be-measured device; and calculating a parameter of the to-be-measured device by utilizing the measured data and the error parameter of the load pull measurement system. Through obtaining the real-time measured data, measured by the vector network analyzer, of the to-be-measured device, the parameter of the to-be-measured device can be calculated in real time without being influenced by the mechanical repeatability of an impedance tuner, so that the measurement accuracy for the parameter of the to-be-measured device is improved.