Current Issue : April - June Volume : 2016 Issue Number : 2 Articles : 6 Articles
This paper proposes a novel microwave continuous adjustable band-pass filter integrated power divider based on nematic liquid\ncrystals (LCs). The proposed power divider uses liquid crystal (LC) as the dielectric material. It can realize phase shift by changing\nthe dielectric anisotropy, when biasing the high anisotropy nematic liquid crystal. It is mainly used in microwave frequencies. It has\na large number of advantages compared to conventional filter integrated power divider, such as low loss,multifunction integration,\ncontinuous adjustable, miniaturization, low processing costs, low operating voltage, high phase shift, and convenient manufacture.\nTherefore, it has shown great potential for application....
The description of snow microstructure in microwave\nmodels is often simplified to facilitate electromagnetic\ncalculations. Within dense media radiative transfer\n(DMRT), the microstructure is commonly described by\nsticky hard spheres (SHS). An objective mapping of real\nsnow onto SHS is however missing which prevents measured\ninput parameters from being used for DMRT. In contrast, the\nmicrowave emission model of layered snowpacks (MEMLS)\nemploys a conceptually different approach, based on the twopoint\ncorrelation function which is accessible by tomography.\nHere we show the equivalence of both electromagnetic\napproaches by reformulating their microstructural models in\na common framework. Using analytical results for the twopoint\ncorrelation function of hard spheres, we show that the\nscattering coefficient in both models only differs by a factor\nwhich is close to unity, weakly dependent on ice volume fraction\nand independent of other microstructural details. Additionally,\nour analysis provides an objective retrieval method\nfor the SHS parameters (diameter and stickiness) from tomography\nimages. For a comprehensive data set we demonstrate\nthe variability of stickiness and compare the SHS diameter\nto the optical equivalent diameter. Our results confirm\nthe necessity of a large grain-size scaling when relating both\ndiameters in the non-sticky case, as previously suggested by\nseveral authors....
Propagating quantum microwaves have been proposed and successfully\nimplemented to generate entanglement, thereby establishing a promising platform\nfor the realisation of a quantum communication channel. However, the\nimplementation of quantum teleportation with photons in the microwave regime is\nstill absent. At the same time, recent developments in the field show that this key\nprotocol could be feasible with current technology, which would pave the way to\nboost the field of microwave quantum communication. Here, we discuss the\nfeasibility of a possible implementation of microwave quantum teleportation in a\nrealistic scenario with losses. Furthermore, we propose how to implement quantum\nrepeaters in the microwave regime without using photodetection, a key prerequisite\nto achieve long distance entanglement distribution....
For the first time the effect of light on the CVC of strained p-n-junction in a strong microwave field\nis examined. It is shown that the deformation and the microwave field increase the current\nthrough p-n-junction, and the light decreases it. The mechanism of this phenomenon is explained\nby the fact that under heating of the charge carriers by microwave field the recombination current\narises, and under the action of light the generation current arises which are directed oppositely.\nAnd under the influence of the deformation the band gap of the semiconductor will be changed....
Electromagnetic properties of an anisotropic stratified slab with an arbitrary orientation of the anisotropy axis under an oblique\nincidence of a plane harmonic wave are studied.The dependence of the eigen wave wavenumbers and the reflection coefficient on\nan anisotropy axis orientation and frequency is investigated. For the first time, the expression for the translation matrix is obtained\nin the compact analytical form. The controlled two-way dual-frequency (duplex) isolator based on the above described slab is\npresented for the first time. It is based on the properties of the anisotropic structure described here but not on the Faraday effect....
The turn ratio, coupling space between sections, and substrate permittivity effects on spilt ring resonator (SRR) are investigated.\nThe analysis of the presented SRR with respect to the effects of substrate and number of gaps per ring to further characterize\nits peculiarities is experimented with miniaturized capability as our intent. Six different SRRs were designed with different turn\nratios, and the sixth is rectangular microstrip patch centre-inserted. Different numbers and gap sizes are cut on the SRRs while the\ngap spacing between the conductors of the SRR was varied to determine their effects taking cognizance of the effects of different\nsubstrates.The designs were investigated numerically using 3D finite integration technique commercia lE Msolver, and the resulting\ndesigns were prototyped and subsequently measured. Findings indicate that the reflection coefficient of the MSRR with centreinserted\npatch antenna is better compared to MSRR without the patch antenna irrespective of the laminate substrate board, and so\nis its gain....
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