A sub-harmonic mixer for the 220-325GHz band was developed using a SiC platform first time. An anti-parallel Fermi-level managed barrier diode pair monolithically integrated with waveguide couplers and filters on an epi-layer transferred substrate. The chip assembled in waveguide-input package broadband transimpedance amplifier. lowest obtained noise equivalent power as low 5×10-19W/Hz signal f...

We prove an intrinsic equivalence between strong hypercontractivity (sHC) and a strong logarithmic Sobolev inequality (sLSI) for the cone of logarithmically subharmonic (LSH) functions. We introduce a new large class of measures, Euclidean regular and exponential type, in addition to all compactly-supported measures, for which this equivalence holds. We prove a Sobolev density theorem through L...

OBJECTIVE To test whether an association between HCV genotype, HLA class II alleles distribution and extra-hepatic manifestations (EHM ) can be demonstrated in a group of Italian patients with chronic HCV infection . METHODS Sixty patients affected by HCV infection with EHM were consecutively enrolled. 163 HCV patients without EHM were tested as controls for the prevalence of HCV genotypes, w...

Extrahepatic manifestations (EHM) of hepatitis C have significant impacts on both morbidity and mortality over and above the contributions of liver disease. Fortunately, early recognition and treatment may reduce permanent disability and improve long-term prognosis. However, recognizing and treating EHM can be a challenge due to diverse presentations, multisystem involvement, and the historical...

Measurements of the frequency stability of a far-infrared molecular laser have been made by mixing the harmonic of an ultrastable microwave source with a portion of the laser output signal in a terahertz (THz) Schottky diode balanced mixer. A 3 GHz difference-frequency signal was used in a frequency discriminator circuit to lock the laser to the microwave source. Comparisons of the short- and l...

: We report on the design, fabrication and test of an integrated 320-360 GHz Sub-Harmonic Image Rejection Mixer (SHIRM) using planar Schottky diodes. The integrated circuit uses two separate anti-parallel pairs of diodes mounted onto a single quartz-based circuit. Measurement results give SSB receiver noise temperatures of 3300 K at 340 GHz, with an image rejection from 7.6 dB to 23 dB over the...

A 30GHz optically injection-locked self-oscillating optoelectronic mixer (OIL-SOM) is implemented with a high-performance InP/InGaAs heterojunction phototransistor. The sub-harmonic conversion efficiency and phase noise characteristics of OIL-SOM are investigated and used for analyzing OIL-SOM-based 60GHz radio-on-fiber downlink data transmission performance. The OIL-SOM characteristics provide...

In this paper a new behavioral modeling approach for RF systems based is presented, based on a Volterra series input-output map representation. The modeling is done purely in the frequency domain, capturing the typical system level speciications for RF building blocks, independent of the implementation details. A harmonic balance simulation tool has been developed based on those models. The imp...

In this paper we give a method for constructing complex valued harmonic morphisms in some pseudo-Riemannian manifolds using a parametrization of isotropic subbundles of the complexified tangent bundle. As a result we construct the first known examples of complex valued harmonic morphisms in real hyperbolic spaces of even dimension not equal to 4 which do not have totally geodesic fibres.