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Abstract

A design of microwave installation for energy concentration on a surface of a heated object is proposed. In the installation a dipole lattice on the basis of a single-wire transmission line is used which is located inside of reflector in a form of specular parabolic conducting cylinder. The heated object is placed in the area of microwave energy concentration.

In the article a waveguide field of a surface wave in a reradiation mode is explored. The surface wave is reradiated by a group of vibrators coaxial with the waveguide wire. Results of experimental studies of field distribution along the waveguide operating in various modes are presented. The possibility of efficiency increase in reradiated field and its adjustment by contactless movement of reflector is shown.

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Authors and Affiliations

Jacek Cieslik
Vladimir Kismereshkin
Ekaterina Ritter
Alexey Savostin
Dmitry Ritter
Nabi Nabiyev
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Abstract

In the paper, an overview of the methods and algorithms of synthesis, realization and implementation used by the author to obtain orthogonal 3-D filters with a structure made of Givens rotations has been presented. The main advantage of orthogonal filters, which may have a lower sensitivity to quantization of the coefficients, was indicated. The author proposed a number of possible changes and modifications of individual stages, which may result in obtaining filters with even better parameters. The work will be the basis for the direction of further research.
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Bibliography

[1] P.P. Vaidyanathan, „Multirate Systems And Filter Banks”, Prentice-Hall, Englewood Cliffs, New Jersey, 1993. ISBN: 81-7758-942-3
[2] V. C. Liu, P. P. Vaidyanathan, „ Roundoff noise generated by orthogonal building blocks in signal processing structures”, IEEE International Symposium on Circuits and Systems, Finland, 1988, pp. 2731-2734. DOI: 10.1109/ISCAS.1988.15504
[3] E. Deprettere, „Synthesis and fixed-point implementation of pipelined true orthogonal filters”, ICASSP '83. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1983, pp. 217-220. DOI: 10.1109/ICASSP.1983.1172177
[4] A. Fettweis, „Digital filter structures related to classical filter networks”, AEÜ, vol. 25, no. 2, 1971, pp. 79-89.
[5] E. Deprettere, „Synthesis and fixed-point implementation of pipelined true orthogonal filters”, ICASSP '83. IEEE International Conference on Acoustics, Speech, and Signal Processing, 1983, pp. 217-220. DOI: 10.1109/ICASSP.1983.1172177
[6] R. Wirski, K. Wawryn, „Stanowa synteza systemów bezstratnych o skończonej odpowiedzi impulsowej”, Przegląd Elektrotechniczny, vol. 86(11a), 2010, str. 218-221.
[7] R.T.Wirski, „Synthesis of 2-D state-space equations for orthogonal separable denominator systems”, International Conference on Signals and Electronic Systems (ICSES), Gliwice 2010, pp. 285-288.
[8] R.T.Wirski, „On the realization of 2-D orthogonal state-space systems”, Signal Processing, vol. 88, no. 11, 2008, pp. 2747-2753. DOI: 10.1016/j.sigpro.2008.05.018
[9] R. Wirski, K. Wawryn, „State space synthesis of two-dimensional FIR lossless filters”, International Conference on Signals and Electronic Systems (ICSES), Krakow 2008, pp. 367-370. DOI:   10.1109/ICSES.2008.4673438
[10] R.T. Wirski, „Synthesis of orthogonal Roesser model for two-dimensional FIR filters”, International Symposium on Information Theory and its Applications (ISITA), Taichung Taiwan 2010. DOI: 10.1109/ISITA.2010.5649701
[11] R.Wirski, K.Wawryn, B. Strzeszewski, „State-space approach to implementation of FIR systems using pipeline rotation structures”, International Conference on Signals and Electronic Systems (ICSES), Wroclaw 2012. DOI: 10.1109/ICSES.2012.6382223
[12] K.Wawryn, R.Wirski, B. Strzeszewski, „Implementation of finite impulse response systems using rotation structures”, International Symposium on Information Theory and Its Applications (ISITA), Taichung Taiwan 2010, pp. 606-610. DOI: 10.1109/ISITA.2010.5649712
[13] R. T. Wirski, B. Strzeszewski, K. Wawryn, „Orthogonal implementation of two-dimensional separable denominator systems”, International Conference on Signals and Electronic Circuits (ICSES), Gliwice 2010, pp. 371-374.
[14] P. Poczekajło, R. Wirski, „Synteza separowalnych trójwymiarowych filtrów ortogonalnych o strukturze potokowej”, Przegląd Elektrotechniczny, vol. 89(10), 2013, str. 150-152. DOI: 10.15199/48.2016.09.02
[15] P. Poczekajło, R. Wirski, „Synthesis and Realization of 3-D Orthogonal FIR Filters Using Pipeline Structures”, Circuits Systems and Signal Processing, vol. 37, no. 4, 2018 (online 2017), pp. 1669-1691. DOI: 10.1007/s00034-017-06
[16] P. Poczekajło, K. Wawryn, „Algorithm for Realisation, Parameter Analysis, and Measurement of Pipelined Separable 3D Finite Impulse Response Filters Composed of Givens Rotation Structures”, IET Signal Processing, vol. 12, iss. 7, 2018, pp. 857-867. DOI: 10.1049/iet spr.2017.0450
[17] K. Wawryn, P. Poczekajlo, R. Wirski, „FPGA implementation of 3-D separable Gauss filter using pipeline rotation structures”, 22nd International Conference on Mixed Design of Integrated Circuits Systems (MIXDES), Torun 2015, pp. 589-594. DOI: 10.1109/MIXDES.2015.7208592
[18] P. Poczekajlo, K. Wawryn, „Hardware implementation of 3D pipelined laplace filter based on rotation structures”, 24th International Conference on Mixed Design of Integrated Circuits Systems (MIXDES), Bydgoszcz 2017, pp. 276-280. DOI: 10.23919/MIXDES.2017.8005215
[19] P. Poczekajło, „Analiza wybranych metod realizacji sprzętowej rotatorów Givensa w układzie FPGA”, Przegląd Elektrotechniczny, vol. 94(9), 2018, str. 26-28. DOI: 10.15199/48.2018.09.06
[20] R. P. Roesser, „A discrete state-space model for linear image processing”, IEEE Trans. Automat. Contr., vol. 20, no. 1, Feb. 1975, pp. 1–10.
[21] R. Suszyński, K. Wawryn, R. Wirski, „2D signal processing for identification and tracking moving object”, Przegląd Elektrotechniczny, vol. 87(10), 2011, str. 126-129. ISSN 0033-2097
[22] K. Gałkowski, „State-space realisations of linear 2-D systems with extensions to the general nD (n>2) case”, Springer, London, 2001. ISBN: 978-1-84628-573-8. DOI: https://doi.org/10.1007/BFb0110347
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Authors and Affiliations

Paweł Poczekajło
1

  1. Faculty of Electronics and Computer Science, Koszalin University of Technology, Koszalin, Poland
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Abstract

Noise-like binary sequences combined with signals with linear frequency modulation might be successfully used to increase the reliability of the recognition of both probe and communication signals in the presence of natural and artificial interference. To identify such formed sequences the usage of the two-step matched filtering was suggested and the probabilistic model of the recognition of noise-like code sequences transferred by LFM signals was developed.

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Authors and Affiliations

Tadeusz Leszczyński
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Abstract

Hydrogen (H2) and liquid petroleum gas (LPG) sensing properties of SnO2 thin films obtained by direct oxidation of chemically deposited SnS films has been studied. The SnS film was prepared by a chemical technique called SILAR (Successive Ionic Layer Adsorption and Reaction). The sensor element comprises of a layer of chemically deposited SnO2 film with an overlayer of palladium (Pd) sensitiser. The Pd sensitiser layer was also formed following a chemical technique. The double layer element so formed shows significantly high sensitivity to H2 and LPG. The temperature variation of sensitivity was studied and the maximum sensitivity of 99.7% was observed at around 200°C for 1 vol% H2 in air. The response time to target gas was about 10 seconds and the sensor element was found to recover to its original resistance reasonably fast. The maximum sensitivity of 98% for 1.6 vol% LPG was observed at around 325°C. The sensor response and recovery was reasonably fast (less than one minute) at this temperature.

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Authors and Affiliations

P. Mitra
S. Mondal

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