Wszystkie pola: microwave power - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Influence of the Microwave Power on Josephson Microwave Absorption in High- Temperature Superconductors
Autorzy:: Czyżak, B.
Stankowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1887983.pdf
Data publikacji:: 1991-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.50.+r
74.70.Vy
Opis:: The influence of the microwave power on the internal Josephson Junction System (JJS) in granular high T$\text{}_{c}$, superconductors was investigated using EPR methodology. Josephson Microwave Absorption signal was used to monitor local temperature of the Josephson Junction System while the bulk sample temperature was measured by a thermocouple. The effect of the JJS overheating is discussed as the consequence of an interaction between JJS, microwave field and the bulk sample.
Źródło:: Acta Physica Polonica A; 1991, 80, 1; 99-106
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The 100 W class A power amplifier for L-band T/R module
Autorzy:: Wojtasiak, W.
Gryglewski, D.
Sędek, E.
Powiązania:: https://bibliotekanauki.pl/articles/308787.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: modelling
MESFETs
finite difference time domain method
power transistors
microwave transistors
Opis:: In the paper a balanced high power amplifier with class A silicon bipolar transistors for L-band T/R module is described. The amplifier was designed for maximum power and minimum transmitance distortions. The obtained parameters of the amplifier are as follow: output power at 1 dB compression P(1dB)>49 dBm, linear gain IS21I>10 dB, and transmitance deviations during the RF pulse: phase delta arg(S2)<0.9° and deltaP(out)<0.2 dB.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 1; 11-13
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: FDTD modeling and experimental verification of electromagnetic power dissipated in domestic microwave ovens
Autorzy:: Kopyt, P.
Celuch-Marcysiak, M.
Powiązania:: https://bibliotekanauki.pl/articles/309259.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: symulacja elektromagnetyczna
algorytm FDTD
nagrzewanie mikrofalowe
electromagnetic simulations
FDTD algorithm
microwave heating
Opis:: The FDTD (Finite Difference Time Domain) method has proven to be effective in modeling high-frequency electromagnetic problems in telecommunications industry. Recently it has been successfully applied in microwave power engineering. In order to accurately model scenarios typical in this field one has to deal with the movement of objects placed inside cavities. This paper describes a simple algorithm that makes it possible to take into account object rotation - important in simulations of domestic microwave ovens. Results of example simulations are presented and an experimental verification of the simulation tool is performed.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 1; 59-65
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Optical control of semiconductor synchronized microwave oscillators in the power suppression mode
Autorzy:: Usanov, D.A.
Skripal, A.V.
Abramov, A.V.
Powiązania:: https://bibliotekanauki.pl/articles/309231.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: synchronizacja
sterowanie optyczne
generator mikrofalowy
dioda Gunna
optical control
synchronization
semiconductor microwave oscillator
Gunn diode
Opis:: The influence of optical radiation on the performance of the synchronized microwave Gunn-diode oscillator in the coherent signals subtraction mode has been described theoretically and investigated experimentally. The high sensitivity of the oscillator characteristics to the change of the optical intensity affecting the semiconductor diode structure has been shown. It is suggested to use this mode for the creation of optoelectronic microwave systems with the controlled amplitude and phase of the output signal and for the high-accuracy indication of optical radiation.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 1; 30-35
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A 100 W ISM 2.45 GHz-band power test system
Autorzy:: Wojtasiak, W.
Gryglewski, D.
Gwarek, W.
Powiązania:: https://bibliotekanauki.pl/articles/307777.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: microwave precise heating
high power solid-state amplifier
push-pull GaAs FET
synthetsizer
power measurement unit
Opis:: This paper describes development of solid-state microwave power test system (MPTS) operating over 2.3 to 2.6 GHz with the output power level of 100 W for industrial applications in material processing, and for designing of microwave power industrial equipment. The MPTS unit consists of four major parts: PLL synthesizer, high power solid-state amplifier, detector probes for return losses and leakage measurement and microcontroller. The MPTS system is able to operate in either single fixed-frequency regime, or in swept mode with self-tuning for minimum reflection of a heated load.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 2; 23-28
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: High Power Microwave Detection in Asymmetrically Shaped n-Al$\text{}_{x}$Ga$\text{}_{1-x}$As Structures
Autorzy:: Ašmontas, S.
Čerškus, A.
Gradauskas, J.
Kundrotas, J.
Lučun, A.
Petkun, V.
Sužiedėlis, A.
Šilėnas, A.
Powiązania:: https://bibliotekanauki.pl/articles/2041762.pdf
Data publikacji:: 2005-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 07.57.Kp
84.40.-x
72.20.Ht
Opis:: Investigations of detection of high power microwaves in planar asymmetrically shaped microwave diodes on the basis of Al$\text{}_{x}$Ga$\text{}_{1-x}$As ternary semiconductors with various AlAs mole fraction are presented. The principle of operation of the microwave diodes is based on carrier heating phenomena in asymmetrically shaped homogeneous semiconductor structure due to different distribution of the electric field strength along the sample. Experimental results of microwave detection on the barrier-less asymmetrically shaped diodes are presented paying special attention to the homogeneity of Al$\text{}_{x}$Ga$\text{}_{1-x}$As which was monitored by photoluminescence technique.
Źródło:: Acta Physica Polonica A; 2005, 107, 2; 315-318
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Resistive Sensor for Short High-Power Microwave Pulse Measurement in Millimeter Wave Range
Autorzy:: Tamošiūnas, V.
Kancleris, Ž
Dagys, M.
Simniškis, R.
Agee, F.
Powiązania:: https://bibliotekanauki.pl/articles/1177568.pdf
Data publikacji:: 2005-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Ht
72.30.+q
85.30.De
Opis:: We report on the numerical investigation of the resistive sensor for the 78-118 GHz range. A three-dimensional finite-difference time-domain method was applied to simulate the wave propagation within a waveguide segment with the semiconductor sensor attached to a wider wall of the wave-guide. The electric field distribution, voltage standing-wave ratio and the average electric field dependences on frequency have been determined for several sets of dimensions and specific resistances of the sample. It is demonstrated that a proper selection of the dimensions and specific resistance of the sample can compensate the waveguide dispersion and the decrease of the electron heating effect with frequency. Therefore, a nearly constant sensitivity of the sensor can be obtained for the entire frequency range.
Źródło:: Acta Physica Polonica A; 2005, 107, 2; 420-424
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis and optimization of outputs of high power microwave tubes
Autorzy:: Węgrzyniak, P.
Gwarek, W.
Baczewski, D.
Powiązania:: https://bibliotekanauki.pl/articles/307618.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: high power microwave tubes
optimization of outputs
Opis:: The subject of this work is optimization of outputs of L-band high power microwave tubes. These outputs are constructed as coaxial-to-waveguide transitions with a vacuum barrier in a form of glass or ceramic cup. The goal of optimization is to obtain sufficiently low reflection loss in the predefined frequency band and to avoid so called hot spots caused by excessive dissipation of microwave power in parts of the cup. Electromagnetic simulator has been applied to model the behavior of the optimized transition and to propose its optimum shape. The proposed solutions were verified by Z.E. Lamina SA in prototypes of high power (pulsed 600 kW) amplitrons and are to be used in manufacturing practice.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 1; 35-39
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Josephson Network as a Model for Inhomogeneous Superconductor: a Microwave Power Absorption
Autorzy:: Rycerz, A.
Spałek, J.
Powiązania:: https://bibliotekanauki.pl/articles/2047320.pdf
Data publikacji:: 2007-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.81.Fa
74.25.Nf
Opis:: We discuss the applied magnetic field dependence of the microwave absorption by a three-dimensional array of up to 30×30 ×30 Josephson junctions with random parameters including the resistivity, capacity, and inductance of each junction. The numerical simulation results for the networks show characteristic microwave absorption anomalies observed in the ceramic samples of high temperature superconductor YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$. We also provide a discussion of the absorption in simple analytical terms of the Josephson loop instabilities.
Źródło:: Acta Physica Polonica A; 2007, 111, 4; 581-594
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Experimental Investigation of High Pulse Power Microwave Resistive Sensor with Flat Frequency Response
Autorzy:: Kancleris, Ž.
Simniškis, R.
Dagys, M.
Tamošiūnas, V.
Ragulis, P.
Powiązania:: https://bibliotekanauki.pl/articles/1807940.pdf
Data publikacji:: 2009-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 07.57.Kp
72.20.Ht
85.30.De
Opis:: Two types of resistive sensors with flat frequency response for microwave pulse power measurements in X-band rectangular waveguide WR-90 up to 100 kW were developed and experimentally investigated. The first type of the sensors demonstrates higher sensitivity and larger output signal, while the second one exhibits better linearity of the output signal. The experimental investigations revealed the sensitivity variation within ± 10% in 8.2-12.2 GHz frequency band.
Źródło:: Acta Physica Polonica A; 2009, 115, 6; 1122-1124
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications
Autorzy:: Bischoff, R.
Charon, R.
Duperoux, J.
Martin, B.
Pinguet, S.
Powiązania:: https://bibliotekanauki.pl/articles/1807853.pdf
Data publikacji:: 2009-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 84.30.Ng
84.32.Hh
84.32.Tt
84.60.Ve
Opis:: The need for repetitive high-power microwave systems, for instance within the scope of convoy protection, requires the availability of compact, repetitive pulsed-power generators. The development and the first experimental results of an upgraded balanced ISL Marx generator for future repetitive operations at pulse repetition frequencies in the order of 100 Hz are introduced. A key objective is to keep the fundamental modular coaxial concept by reason of its scalability and compactness. Simulation models were developed under the PSpice software package in order to investigate the charging and discharging phases of the Marx generator and also to determine the design criteria for repetitive operations. The charging resistors were replaced by ultracompact inductors for rapid charging, being able to withstand pulsed voltages up to 60 kV and pulsed currents up to 1.4 kA during the discharge phase. An improved type of strontium-titanate high-voltage ceramic capacitor was successfully tested experimentally up to 70 kV. Each new elementary stage of the Marx generator consists of eight 1.1 nF sectors of a cylinder capacitors mounted in parallel, two charging inductors of about 17.8 μH and two halves of spherical spark gaps. The pressurized self-triggered gas switches are arranged along the axis for fast consecutive breakdown thanks to the UV radiation emitted during the breakdown in each gap. The stages are installed in individual fibreglass housings. First experimental results of a 4-stage Marx generator in repetitive operation, driven by a 4 kW capacitor charging power supply up to a maximum voltage of 40 kV, are presented.
Źródło:: Acta Physica Polonica A; 2009, 115, 6; 964-966
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: 27 dBm Microwave Amplifiers with Adaptive Matching Networks
Autorzy:: Rosolowski, D.
Wojtasiak, W.
Gryglewski, D.
Powiązania:: https://bibliotekanauki.pl/articles/226524.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Adaptive Power Amplifiers (APAs)
components for Software Defined Radio
multi-band devices
multi-mode devices
RF
adaptivity
tunable matching networks
Opis:: The paper describes adaptive amplifier design with varactors and pin diodes as regulators of matching networks. As examples the two amplifiers with SHF-0189 HFET transistor and different matching sections were designed and manufactured. The output power level of 27 dBm and gain higher than 13 dB within L and S-band have been achieved. The amplifier design methodology is based on the small-signal approach and DC characteristics of transistors and regulators. Amplifier adaptivity allows us to remotely control the chosen parameters such as: frequency range, output power level, gain and etc.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 1; 103-108
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: A Computer-controlled System of High-power Microwave Sources
Autorzy:: Korpas, P.
Gryglewski, D.
Wojtasiak, W.
Gwarek, W.
Powiązania:: https://bibliotekanauki.pl/articles/226529.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: SiC
GaN
high power amplifier
PLL synthesizer
microwave sources
Opis:: The paper presents the design and hardware implementation of a computer controlled system composed of up to four high-power microwave sources. Each source provides up to 200 W of continuous wave power. Frequency of each source is stabilized within ±0.5 ppm of the nominal frequency adjustable within 2.35÷2.6 GHz range. All four sources can be synchronized to the same frequency with computer-controlled phase shift between the signals generated by each of them. The paper concentrates on the choice of components for such a system and the properties of the realized hardware implementation.
Źródło:: International Journal of Electronics and Telecommunications; 2011, 57, 1; 121-126
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Effect of microwave power on EPR spectra of DOPA-melanin-netilmicin complexes with different drug concentrations : a study at temperatures in the range of 125-275 K
Autorzy:: Zdybel, M.
Pilawa, B.
Buszman, E.
Wrześniok, D.
Krzyminiewski, R.
Kruczyński, Z.
Powiązania:: https://bibliotekanauki.pl/articles/146482.pdf
Data publikacji:: 2013
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: DOPA-melanin
electron paramagnetic resonance (EPR) spectroscopy
free radicals
netilmicin
Opis:: Electron paramagnetic resonance (EPR) spectra of the model eumelanin – DOPA-melanin complexes with netilmicin measured with a microwave power in the range 0.3–200 mW were examined. The influence of microwave power on amplitudes (A) and linewidths (ΔBpp) of the spectra was determined. The EPR spectra were recorded by a BRUKER spectrometer at temperatures 125, 175, 225 and 275 K. Continuous microwave saturation of EPR lines was used to compare the acceleration of spin-lattice relaxation processes in melanin samples. Changes of the parameters of the EPR spectra of DOPA-melanin-netilmicin complexes, with the microwave power for the samples differing in netilmicin concentrations, were observed. The effect of temperature on the changes of the EPR spectra of the analyzed melanin complexes with the microwave power was determined. The spin-lattice relaxation is faster at higher temperatures for all the tested melanin complexes.
Źródło:: Nukleonika; 2013, 58, 3; 407-411
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Influence of Microwave Power on EPR Signal of Melanin Radical and Copper(II) Ions in DOPA-Melanin Complexes
Autorzy:: Najder-Kozdrowska, L.
Pilawa, B.
Więckowski, A.
Buszman, E.
Wrześniok, D.
Powiązania:: https://bibliotekanauki.pl/articles/1399522.pdf
Data publikacji:: 2013-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.30.Rn
87.80.Lg
87.64.kh
Opis:: Electron paramagnetic resonance spectroscopy EPR was used for examination of microwave saturation in DOPA-melanin complexes with kanamycin and Cu(II) ions. The fast spin-lattice relaxation processes take place in system of paramagnetic metal ions. EPR signal of melanin radical saturated with growing of microwave power used during measurements. After adding Cu(II) ions a shortening of relaxation time is observed for EPR signal of melanin radical.
Źródło:: Acta Physica Polonica A; 2013, 124, 1; 112-114
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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