Liquid Crystalline Polymers as Tunable Composite Resins for Composites Applications

The work presented in this Thesis describes the use of reactive all aromatic liquid crystalline thermosetting resins for fiber reinforced composite applications. One of the challenges associated with reactive LC thermoplastic resins is that the melting temperature ( T k lc ) is typically close to or above the decomposition temperature. In order...

Toward an Improved Representation of Middle Atmospheric Dynamics Thanks to the ARISE Project

This paper reviews recent progress toward understanding the dynamics of the middle atmosphere in the framework of the Atmospheric Dynamics Research InfraStructure in Europe (ARISE) initiative. The middle atmosphere, integrating the stratosphere and mesosphere, is a crucial region which influences tropospheric weather and climate. Enhancing...

Enhancing biodiesel production using green glycerol-enriched calcium oxide catalyst: An optimization study

The present article demonstrates a superior catalytic performance of glycerol-enriched calcium oxide for biodiesel production than other calcium-based counterparts. The proficiency of glycerol-enriched calcium oxide in catalyzing the methanolysis of crude Jatropha curcas oil containing high free fatty acids content was systematically...

Mixed-signal instrumentation for large-signal device characterization and modelling

This thesis concentrates on the development of advanced large-signal measurement and characterization tools to support technology development, model extraction and validation, and power amplifier (PA) designs that address the newly introduced third and fourth generation (3G and 4G) wideband communication standards. By exploiting an innovative...

Open loop load pull arrangement with determination of injections signals

Measurement arrangement and method for active load pull measurements of a device under test (1). A wideband analog-to-digital conversion block (3) is provided for obtaining measurement data. First and second injection signal generators (7, 8) are connected to a source side and a load side of the device under test (1). This set up allows to...

A 90-W peak power GaN outphasing amplifier with optimum input signal conditioning

A 90-W peak-power 2.14-GHz improved GaN outphasing amplifier with 50.5% average efficiency for wideband code division multiple access (W-CDMA) signals is presented. Independent control of the branch amplifiers by two in-phase/quadrature modulators enables optimum outphasing and input power leveling, yielding significant improvements in gain,...

Active Harmonic Load–Pull With Realistic Wideband Communications Signals

A new wideband open-loop active harmonic load–pull measurement approach is presented. The proposed method is based on wideband data-acquisition and wideband signal-injection of the incident and device generated power waves at the frequencies of interest. The system provides full, user defined, in-band control of the source and load reflection...

Enabling Low-Distortion Varactors for Adaptive Transmitters