Autor: Wiatr, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A broadband multistate interferometer for impedance measurement
Autorzy:: Szymański, P.
Wiatr, W.
Powiązania:: https://bibliotekanauki.pl/articles/307775.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: impedance measurement
multistate interferometer
reflectometer
Opis:: We present a new four-state interferometer for measuring vectorial reflection coefficient from 50 to 1800 MHz. The interferometer is composed of a four-state phase shifter, a double-directional coupler and a spectrum analyzer with an in-built tracking generator. We describe a design of the interferometer and methods developed for its calibration and de-embedding the measurements. Experimental data verify good accuracy of the impedance measurement.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 2; 29-33
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of errors in on-wafer measurements due to multimode propagation in CB-CPW
Autorzy:: Lewandowski, A.
Wiatr, W.
Powiązania:: https://bibliotekanauki.pl/articles/307779.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: on-wafer measurements
multimode propagation
error analysis
conductor-backed coplanar waveguide (CB-CPW)
microstrip-like mode
numerical electromagnetic analysis
on-wafer probe
calibration
de-embedding
monolithic microwave integrated circuit (MMIC)
Opis:: We study for the first time errors in on-wafer scattering parameter measurements caused by the parasitic microstrip-like mode propagation in conductor-backed coplanar waveguide (CB-CPW). We determine upper bound for these errors for typical CPW devices such as a matched load, an open circuit, and a transmission line section. To this end, we develop an electromagnetic-simulations-based multimode three-port model for the transition between an air-coplanar probe and the CB-CPW. Subsequently, we apply this model to examine errors in the device S parameters de-embedded from measurements affected by the parasitic MSL mode. Our analysis demonstrates that the multimode propagation in CB-CPW may significantly deteriorate the S-parameters measured on wafer.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 2; 16-22
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:: A method for evaluation of uncertainties of noise parameter measurement
Autorzy:: Schmidt-Szałowski, M.
Wiatr, W.
Powiązania:: https://bibliotekanauki.pl/articles/308144.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: microwaves
noise metrology
measurement system
four noise parameters
sensitivity analysis
error propagation
uncertainty
Opis:: The assessment of uncertainties of a two-port noise parameters measurement, presented in the paper, relies on modeling of sources of errors and an investigation of propagation of the errors through a measurement system. This approach is based on a simplified additive error model and small-change sensitivity analysis. The evaluated uncertainties agrees with those observed in experiments. This method may be implemented in automatic noise measurement systems for on-line uncertainty assessment and for optimization of the design of an experiment.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 1; 34-38
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:: A 24 GHz PHEMT-based oscillator
Autorzy:: Lewandowski, A.
Kompa, G.
Mwema, W.
Wiatr, W.
Powiązania:: https://bibliotekanauki.pl/articles/309225.pdf
Data publikacji:: 2003
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: generator mikrofalowy
opór ujemny
microwave oscillator
oscillator design method
negative resistance
describing function
nonlinear PHEMT model
microstrip components models
Opis:: We present a systematic nonlinear procedure for designing microwave oscillators utilising a nonlinear PHEMT model, the negative resistance approach and the describing function concept. The procedure is applied in the design of a 24 GHz oscillator, which is then realised in hybrid technology. Measurement results show - 6% shift in the frequency but an acceptable agreement in the output power. A detailed analysis shows that the frequency shift arises mainly from inadequate CAD models in the K band, for the microstrip components employed in our design.
Źródło:: Journal of Telecommunications and Information Technology; 2003, 1; 15-19
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:: Analysis of downy mildew infection of field pea varieties using the logistic model
Autorzy:: Bakinowska, E.
Pilarczyk, W.
Osiecka, A.
Wiatr, K.
Powiązania:: https://bibliotekanauki.pl/articles/65343.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: The logistic model is commonly used for analysis of discrete, multinomial data. Such a model was used for the statistical evaluation of data concerning infection of field pea varieties by downy mildew, in two series of field trials. Each series consisted of experiments performed in locations spread over the whole of Poland in the time period from 2002 to 2005. Varieties cultivated on light soils were compared in the first series, and varieties cultivated on rich soils in the second. The most resistant varieties were identified (Sokolik - light soils, Terno - rich soils) and significant differences among varieties were detected. Estimators of model parameters were found using the Fisher scoring method implemented in logistic glm procedure of the SAS system.
Źródło:: Journal of Plant Protection Research; 2012, 52, 2
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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