Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"RF measurement"”.
-
Frequency and Field Strength Materials Characterization with Complementary Split-ring Resonators, Coplanar Waveguides, and the Virtual Ground Method
… Additionally and complementary to the RF measurement systems, a ferroelectric test measurement system for high-frequency and high-power polarization vs. electric field curves was designed, built, tested, and shown to match baseline comparisons. The ferroelectric test system is a …
-
Investigations into Optically Controlled Phase Contrast, Polarisation Switchable Narrow Band RF Detection Techniques.
… Initially, the feasibility of phase-contrast measurements was considered and the limits of phase and amplitude measurements established. A switching matrix was then designed and incorporated into a tri-antenna array to demonstrate triangulation-based location. Commercial, linearly-polarised …
-
Magnetic Cleanliness, Sensing, and Calibration for CubeSats
… where field aligned currents come close to the surface of the Earth and are concentrated near satellites in LEO. Science missions which need to know the local magnetic field in the polar regions need to bring their own high-fidelity magnetic sensors. The AERO-VISTA mission comprises a pair of 6U …
-
Application of Computational Intelligence in Cognitive Radio Network for Efficient Spectrum Utilization, and Speech Therapy
… the available spectrum holes, and the expected RF power in the channels. This will enable the CR to predictively avoid noisy channels among the idle channels, thus delivering optimum QoS at less radio resources. In this study, spectrum holes search using artificial neural network (ANN) and …
-
An investigation of nanoscale materials and their incorporation in patch antenna for high frequency applications
… using thermal evaporation technique and the RF measurement was carried out using Vector Network Analyser (VNA). The resonant frequencies of the CPW diamond shaped MPAs for (PE, PP, PVC, PS and PSF) were found to be 67.5 GHz, 72.36 GHz, 62.41 GHz, 63.25 GHz and 80.58 GHz, respectively. The …
-
Integration, implementation and testing of the X-Band SASAR II system
… and testing are the power budget levels for each RF unit. An insufficient input drive for a mixer may result in a null output. Conversely a high input drive will result in the saturation of the device and the generation of intermodulation products and higher conversion losses. Testing of the …
-
Control and in-situ measurement of adaptive and reconfigurable RF systems.
… hardware that can be optimized to improve performance in different operating conditions, enabling additional flexibility in spectrum assignments. This dissertation examines a spatial-spectral brokering system that can coordinate between active and passive spectral users in a computationally …
-
Radio frequency interference (RFI) modeling of complex modules in mobile devices and system-level modeling for transient ESD simulation
… the systematic modeling of radio-frequency-interference (RFI) and electro-static-discharge (ESD) problems happened in mobile devices.</p> <p>In the first paper, an averaging technique is developed, for phase resolved scanning over random fields generated by multiple uncorrelated stochastic …