Global ETD Search
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Showing 1 to 8 of 8 for “"Antenna theory"”.
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Calibration of Jicamarca radar using F-region incoherent scatter for measurements of D-region backscatter RCS
… calibration algorithm is based on magnetoionic theory, incoherent scatter radar theory, and antenna theory. Based on comparison with published results, as well as with crude estimates, we conclude that the forward model accurately represents propagation in the ionosphere, and that backscatter …
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Sum rules and constraints on passive systems - a general approach and applications to electromagnetic scattering
… is vital. One interesting application is within antenna theory, where the limitations are helpful from a designer's viewpoint; they can give an understanding as to what factors limit performance, and also indicate if there is room for improvement or not.
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Integral Identities for Passive Systems and Spherical Waves in Scattering and Antenna Problems
… and physical limitations within electromagnetic theory and antenna theory have received significant attention in the last few years. However, the derivations are often relying on application specific and sometimes unsupported assumptions, and therefore a mathematically rigorous and generally …
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Manufacturing and Characterization of Gold-Black and Prediction and Measurement of its Directional Spectral Absorptivity
… A first-principle model based on lossy antenna theory is presented to predict the polarization dependent directional spectral absorptivity of gold-black in the visible and near infrared. Results for normal spectral absorptivity are in good agreement with measurements reported in the …
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Measurement And Characterization Of Microwave Transient Electromagnetic Fields Generated From Laser/matter Interaction
… laser excited matter sources was predicted using antenna theory for far field radiators. Experimentally, it is the intention of this investigation to gather comprehensive time and frequency domain data on laser matter generated electromagnetic pulses using a number of specific laser targets. …
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Electrically-Small Antenna Performance Enhancement for Near-Field Detuning Environments
… low-profile omnidirectional, electrically-small antennas has evolved from the design and construction of AM transmitter towers eighty years ago to current market demand for battery-powered personal communication devices. Electrically-small antenna theory developed with well-known approximations …
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Modal analysis of radiation and energy storage mechanisms on conducting scatterers
… radiation on the determination of an embedded antenna's Q factor is studied using radiation modes, giving a new perspective on the convergence behavior of this parameter with respect to ground plane size. Leveraging the invariance of radiation modes on small objects, an example procedure for …
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Design and feasibility evaluation of low-cost 3D printing of Horn Antennas
… the feasibility of low-cost 3D printing of horn antennas. Relevant antenna theory and current 3D printing technologies are reviewed and a literature review is conducted looking specifically at microwave and RF devices that have been fabricated using 3D printing technologies. The literature …