Novel modulated antennas and probes for millimeter wave imaging applications

摘要: Microwave and millimeter wave (300 MHz 300 GHz) imaging techniques have shown great potential for a wide range of industrial medical applications. These are fundamentally based on measuring relative coherent electromagnetic …elds distributions, e.g., electric …elds, around the object to be imaged. Various systems can devised …eld distributions; each with it own advantages limitations. This dissertation is focused addressing critical challenges related practical implementation various microwave systems. Speci…cally, this research meant achieve three main objectives designing e¢ cient modulated methods/array elements, reducing sensitivity stando¤ distance variations in near-…eld imaging, simple accurate vector network analyzer (VNA) in-situ The concept modulating antenna scatterer structures, directly increase overall system reduce image acquisition time, central development presented herein. To improve upon conventional technique (MST) dipole scatterers; new multiple loaded (MLS) method novel elliptical slot introduced analyzed. A unique di¤erential probe dual-loaded single waveguide aperture developed compensate e¤ect stando¤distance imaging. Finally, design meet rising need devices. realize robust handheld VNA, customdesigned phase shifter sub-resonant slots introduced. proposed MLS method, slot, probe, VNA thoroughly investigated their cacy demonstrated.