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Multi-antenna transmitters based on Massive MIMO and beamforming will be one of the 5G enabler technologies. To have suitable commercial architectures for these transmitters, they must be scalable, cost-effective, energy efficient and present a high-level of integration. This paper presents a technique where the circulator (bulky and expensive) is no longer required in the architecture. This paper...
This paper performs an assessment of available architectures and techniques for Wireless Power Transfer (WPT) transmitter blocks. In the transmitting segment of the WPT chain one of the driving components is the power amplification block, because it generally defines the capability of the system in terms of the range for the WPT link to be established, as well as, limiting or not the amount of information...
In this paper a new behavioral model that describes energy harvester circuits for use in RFID systems will be presented. The use of X parameters, recently proposed for Power Amplifier characterization, will be expanded to RFID circuits. It is expected that this type of model is able to improve the design and optimization of energy harvester circuits, and give a step forward in terms of RFID simulation...
This paper presents a new two-tone measurement signal with dynamic frequency characteristics for PA memory evaluation using a Vector Signal Analyser, VSA, as the instrumentation measurement tool. This new dynamic frequency waveform enables nonlinear PA characterization over frequency with a single measurement similar to what is done for sequential two-tone measurements when the tone spacing is varied...
This paper presents a quantitative metric for memory effects in power amplifiers (PAs) and applies it to various active device technologies and wireless system contexts. The proposed metric is mathematically founded in the dynamic two-tone distortion response, has a clear physical meaning in the important field of PA linearization and can be easily evaluated from either harmonic balance simulations...
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