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This paper presents for the first time measurement data on in-vivo dermatological experiments verifying the performance of a millimeter-wave medical probe designed for skin-cancer diagnosis. The probe consists of a micromachined silicon-core dielectric-rod waveguide, which is metallized and tapered at its tip as a compromise for high field concentration at the probe-to-skin interface, high sensitivity,...
This paper presents experimental terahertz spectroscopy measurements of normal and breast cancer tissue in the range 0.1 to 4 THz. Both tissue types are prepared on microscope glass and polystyrene slides. The preliminary results of a particular tumor tissue using terahertz spectroscopy align with the pathology diagnosis of poorly differentiated tumor. The results demonstrate the potential of terahertz...
A new compact tunable microstrip diplexer based on varactor-tuned dual-mode stub-loaded resonators is investigated. By using the dual coupling paths, the two channel filters can then be designed independently. In addition, by properly varying the dc bias voltages applied to the varactors loaded onto the dual-mode resonators, the passband frequencies of the diplexer can be changed over a wide tuning...
For submillimeter-wave frequency generation we present active six-fold frequency multiplier monolithic integrated circuits. Without post-amplifier stage, an output power of −15 dBm in the frequency range from 507 to 672 GHz is reached. A second S-MMIC with an integrated output buffer amplifier achieves a maximum output power of −8 dBm at 557 GHz and a 3-dB output frequency range from 552 to 618 GHz...
Typical UWB FMCW Ground Penetrating (GPR) Radars operate at low frequencies that require a wide sweep bandwidth thus necessitating complex architectures and bulky broad-band antennas. This poses unique challenges to the system portability especially for manual, wide-area outdoor measurements. In this paper, we present the first design, fabrication and characterization of a complete conformal and miniaturized...
For the first time, a magnetic ink containing permalloy nanoparticles coated with a polyelectrolyte shell is presented for miniaturization of radio frequency (RF) integrated inductors. Coating permalloy particles with an electrolyte polymer provides particle separation which minimizes eddy current losses. Coated particles are incorporated into a viscous ink to enable precise deposition. This magnetic...
This paper is focused on the analysis and modeling of transmission lines loaded with pairs of shunt-connected stepped impedance resonators (SIRs), and their application to differential sensors for dielectric characterization, and for diagnosis and quality control of material samples by comparison to a reference. It is demonstrated that by placing the SIR junctions in the same position of the line,...
A double-pulse technique for the I/V characterization of GaN-based transistors is adopted for the nonlinear modeling of a 0.25 µm AlGaN/GaN on SiC FET. Experimental validation is provided by means of large-signal PA performance prediction both at low-frequency, in order to outline the role played by the resistive drain current source, and at microwaves. Improved prediction accuracy is demonstrated...
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