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 5 of 5 for “"Lens antennas."”.
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Diffraction by Parallel-Plates With Application to Lens Antennas
Scattering of an incident plane, or cylindrical, wave by a staggered parallel-plate waveguide is examined. Of particular interest are the modal coefficients of the unattenuated modes in the waveguide when the incident field is an E-wave. Several past approaches based on ray techniques are …
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The Design and Optimisation of Quasioptical Telescopes
… three instruments on the HSO. Simulations of the lens antennas used to detect the radiation in the higher frequency channels in HIFI were carried out. A number of methods used to determine the phase centre of the beam from lens antennas are described, and use is made of the same optimisation …
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Characteristics of different focusing antennas in the near field region
Focusing antennas are of interest in many application including microwave wireless power transmission, remote (non-contact) sensing, and medical applications. Different kinds of antennas such as array antennas, reflector antennas and Fresnel zone plate (FZP) antennas have been used for these …
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Modal Analysis of Millimetre-wave and Terahertz Imaging Systems
… as a software tool in the modelling of horn and lens antennas. The properties of diffraction limited Bessel beams is described using the Laguerre-Gaussian expansion of conical lenses, and experimental measurements of a conical lens is presented to explore the validity of the use of these optical …
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Electromagnetic pulse technology : biological and terahertz applications
… include High-Power Electromagnetic (HPE) sources/antennas. Two such EMP/HPE antennas, designed to address unique applications, are presented in this dissertation. The first is the Prolate-Spheroidal Impulse-Radiating Antenna (PSIRA). Such an antenna uses a prolate-spheroidal reflector and has two …