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Study of control inhomogeneities of the dielectric between metal planes of microwave devices in phased array antennas

Antonenko A., Geraimchuk M.

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2017

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T. 7, nr 2

8--11

EN

This article describes the phase shifters, based on micro-electromechanical elements connected to phased array antennas which operating in the frequency range 2–30 GHz. Estimations of controllability characteristics located between the metal dielectric planes, heterogeneity as an element of a micromechanical controlled microwave-devices. It is shown that when microdisplacements metal plane above the dielectric effective permittivity inhomogeneities it may vary from the values of the relative permittivity of the dielectric to one unit. Criteria required is small dielectric thickness or frequency at which the dielectric effect is not observed. The results can be used in the design of electromechanical devices managed using the MPN of piezoelectric and electrostrictive actuators or MEMS.

PL

W artykule opisano przesuwniki fazowe na bazie elementów mikro-elektromechanicznych podłączonych do antenowego szyku fazowanego, pracującego w zakresie częstotliwości 2–30 GHz. Dokonano oszacowania cech sterowalności heterogenicznego dielektryka położonych pomiędzy metalowymi płaszczyznami, jako elementu mikromechanicznie sterowanego urządzenia mikrofalowego. Wykazano, że gdy przy mikro-przemieszczeniach metalowa płytki nad dielektrykiem niejednorodności przenikalności skutecznej mogą osiągać wartość 1. Wymagane kryteria to mała grubość dielektryka lub częstotliwość, dla której nie obserwuje się wpływu dielektryka. Wyniki mogą być stosowane przy konstrukcji urządzeń elektromechanicznych sterowanych za pomocą siłowników piezoelektrycznych, elektrostrykcyjnych lub MEMS.

2

The Influence of the Air Gap on the Characteristics of the Double-Shielded Microstrip Delay Devices

Mikucionis S., Urbanavicius V., Gurskas A., Krukonis A.

Przegląd Elektrotechniczny

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2014

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R. 90, nr 6

275--279

EN

A double-shielded microstrip (DSM) device is made of conventional microstrip device and by mounting additional shielded dielectric plate on top of it. The resulting structure is similar to the strip line, but there is a significant difference – a thin air gap that is equal to the thickness of the microstrip. The thickness of this air gap can become uncontrollable in the device manufacture process. In this paper the influence of thin air gap on the electrical parameters of DSM devices such as: microstrip line, coupled lines, multiconductor line, and meander delay line is investigated.

PL

W podwójnie ekranowanym mikropasku (DSM) układu opóźniającego DDs dodano dodatkową warstwę dielektryczną. Cienka szczelina powietrzna ma grubość paska. Ta szczelina może być trudna do kontrolowania w procesie produkcji. W artykule analizowano wpływ szczeliny powietrznej na parametry układu DSM.

3

Electromagnetomechanical coupling response of plastoferrites

Brosseau C., Ndong W.

Materials Science Poland

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2009

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Vol. 27, No. 4/2

1117--1127

EN

The impetus of this work was to investigate the electromagnetic and tensile properties of several commercially available plastoferrites (PFs) at ambient conditions. The approach involved selection of a set of PFs, and measuring their complex effective permittivity ? = ?´ - j?" under uniaxial stress at microwave frequencies in the range 0.1-4.5 GHz at room temperature. The ?spectra have been analyzed for intensively strained PFs up to 3%. Comparing the experimental ? values against several dielectric relaxational behaviours, we find that the main physics cannot be understood with a single relaxation mechanism. More importantly we show that the ? measurements under stress can be explained in terms of a Gaussian molecular network model in the limit of low stress. The present results have important applications in magnetoactive smart composite materials, e.g. flexible circuit technology in the electronics industry (sensors, actuators and micromechanical systems), functionalized artificial skin and muscles for robotic applications.

4

Electromagneto-mechanical coupling response of plasto-ferrites.

Broseau C., Ndong W.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2007

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Vol. 46, nr 19

10-16

EN

The impetus of this work was to investigate the electromagnetic and tensile properties of several commercially available plasto-ferrites (PFs) at ambient conditions. The approach involved selection of a set of PFs, and measuring their complex effective permittivity L = L - e under uniaxial stress at microwave frequencies (0.1-4.5 GHz) and room temperature. We analyze the L spectra for tensilely strained PFs up to 3 prec. Comparing our experimental e data against several dielectric relaxational behaviors, we find that the main physics cannot be understood with a single relaxation mechanism. More importantly we show that the e measurements under stress can be explained in terms of a Gaussian molecular network model in the limit of low stress. The present results have important applications in magnetoactive smart composite materials, e.g. flexible circuit technology in the electronics industry (sensors, actuators and micromechanical systems), functionalized artificial skin and muscles for robotic applications.

5

Effective complex permittivity of two-phase random composite media: a test of the two exponent phenomenological percolation equation.

Myroshnychenko V., Brosseau Ch.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2007

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Vol. 46, nr 19

40-47

EN

The nature of percolation in continuum media inhomogeneous media is a current topic of debate. In this work, Monte Carlo and finite element simulations of the effective complex permittivity, e- e -ye, of two phase random composite media are analyzed using the two exponent phenomenological percolation equation (TEPPE) due to McLachlan. The continuum-percolation system consists of two-dimensional equilibrium distributions of randomly distributed monodisperse circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable circular cylinders) throughout a host matrix. The study is performed on a set of calculations, covering wide ranges of various parameters including the intrinsic constituent permittivity, the surface fraction, and the degree of impenetrability. In our analysis, we first determine the parameters that characterize the critical behavior at the percolation threshold. Our data suggest that the phenomenological TEPPE does not fit the simulation data well over the entire range of surface fraction, and whatever the degree of impenetrability considered. This is attributed, in part, to the fact that the effective medium approximation (restricted to dipolar interactions only) ignores the local field fluctuations explicitly. Moreover, the mixtures exhibit clustering in equilibrium which is not conceptually incorporated in the TEPPE, i.e. the inclusions form cluster with a percolating spongelike topology accompanied by strongly dependent shape of the radial distribution function on the degree of impenetrability. It is argued that further efforts are still needed to fully grasp the numerically (and experimentally) observed features of the effective properties of dielectric heterostructures.