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.
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Showing 1 to 8 of 8 for “"Microwave antennas."”.
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Bandwidth enhancement techniques for low-profile antennas: Theory and experiment
… for bandwidth enhancement for low-profile antennas. The first method involves the use of coupled resonators. In particular, two cavity-backed slot antennas are coupled through an aperture in a common wall. One cavity-backed slot antenna, of the coupled antenna system, is driven. This …
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Modelling and Measurement of the Diffraction of Microwaves by Buildings
Much of the recent growth in microwave communication systems has occurred within urban areas. Private satellite and point to point microwave services have meant that microwave antennas are a common site on the roofs of offices. With the increase in system density comes the increase in the …
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Combined Microwave, Ultrasound and Strain Imaging for Breast Tissue Characterization
… stiffness between tumours and normal tissues. Microwave imaging is an emerging modality that is appealing because it is low-cost and highly safe for patients, as it does not emit harmful radiation. A promising improvement in the field of breast cancer imaging is to utilize the imaging …
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High Order Energy - Conserved Splitting FDTD Methods for Maxwell's Equations
… applications, such as the radio-frequencies, microwave antennas, aircraft radar, integrated optical circuits, wireless engineering and materials, etc. It is of particular importance to develop numerical methods to solve the equations effectively and accurately. During the propagation of …
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Optical nano-antennas: Fabrication, characterization and applications
As optical counterpart of microwave antennas, optical nano-antennas are important devices for converting propagating radiation into confined/enhanced fields at nanoscale. The recent advances in resonant sub-wavelength optical antennas have now offered researchers a continuum of electromagnetic …
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Nanostructured magnetic materials for integrated magnonic devices
… this thesis introduces novel "Magnon Microwave Antennas" (MMAs) for generating tunable microwave frequencies without external bias magnetic fields. The MMAs, comprising patterned arrays of magnetostrictive nanomagnets embedded in piezoelectric heterostructures, generate multimode …
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Photonic generation of microwave signals : a quantum dot mode locked laser as a microwave source
Microwave signals can be photonically generated inside a quantum dot, passively mode locked laser. In order for this laser to be used as a microwave source, a microwave interface was created and connected to the laser. To characterize the source, its output microwave impedance was measured by using …
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Contribution to the uncertainty evaluation in the measurement of the main antenna parameters = Contribución a la evaluación de la incertidumbre en la medida de los principales parámetros de antena
… by measurements is a challenging task. For microwave antennas there are some established measurement techniques based on far-field and near-field methods for antenna parameters. However, established protocols for the determination of measurement errors bounds or overall measurement accuracy …