COMPUTER MODEL FOR CORRECTNESS ASSESSMENT OF ARTIFICIAL LONG LINE SYNTHESIS PROCEDURE
DOI:
https://doi.org/10.18372/2310-5461.52.16382Keywords:
pulse modulator, artificial long line, simulation computer model, algorithm of structural synthesisAbstract
The paper considers processes that take place in pulse modulators of power amplifiers and generators. It is demonstrated that the waveform of output modulator pulse is practically completely determined by the parameters of artificial long line that is a constituent part of the modulator. It is shown that to satisfy the requirements for the pulse waveform, one needs to use heterogeneous long lines. The known procedure of such heterogeneous artificial long line synthesis is considered, which allows one to obtain a required pulse form at the modulator output. It is stressed that during this synthesis, an assumption is usually made that the line, which creates required pulse form of the current for short-circuited load, will create the required pulse form and for the discharge process through the matched impedance. An inference is made about the problem existence that lies in the fact that the mentioned assumption requires verification. The signal waveform at the output of the line requires the assessment of the waveform in the time domain as well. With account of the fact that analytical methods are hard to apply to heterogeneous long lines, the paper proposes as a solution to this problem to use a computer model. Designed computer model was applied to the known from the literature artificial long line, which is composed from five elements and aims to form trapezoidal output signal. During the trial of the artificial long line with the help of simulation computer model, it was established that artificial long line synthesis procedure allows creating the line that, while being discharged over the shot-circuited load, creates the required pulse form. At the same time, while using the model for discharge process simulation over the matched load, the waveform distorts, what points at not totally correct assumption made during the line synthesis. Designed model permits assessing the signal waveform deviation from the required one and gives a possibility to work out a decision as to this waveform improvement. Thus, developed simulation computer model allows one to assess the signal waveform in the time domain at the output of the long line for its different operation modes and check the correctness of the assumption made during the synthesis process. With account of the flexibility and the precision of the designed model, it is possible to use it for long lines parameters verification in pulse modulators, as well as for search of ways of their improvement.
References
Wolff C., Radar Modulator, 2021. URL: http:// www.radartutorial.eu/08.transmitters/Radar%20Modulator.en.html (eng).
Handbook of RF and Microwave Power Amplifi-ers. Ed. J. Walker, Cambridge University Press, Cambridge UK, 2012 (eng).
Eroglu A., Introduction to RF Power Amplifier Design and Simulation. New York: CRC Press Taylor & Francis Group, 2016. doi.org/10.1201/b18677 (eng).
Ness Engineering Inc., Pulse Forming Network Equations and Calculator, 2021, http://www. nes-sengr. com/technical-data/pulse-forming-network-pfn-equations-and-calculator/#TypeB (eng).
Radar Handbook, 3rd ed., Ed. in Chief M. I. Skolnik, McGraw-Hill Companies, NY, 2008 (eng).
Barton D. K., Radar Equations for Modern Radar, Artech House, MA, 2013 (eng).
Radio Frequency and Microwave Power Amplifi-ers. Volume 1: Principles, Device Modeling and Matching Networks. Ed. A. Grebennikov. The In-stitution of Engineering and Technology, London, UK, 2019 (eng).
Radio Frequency and Microwave Power Amplifi-ers. Volume 2: Efficiency and Linearity Enhance-ment Techniques. Ed. A. Grebennikov. The Insti-tution of Engineering and Technology, London UK, 2019 (eng).
Kazimierczuk M. K., RF Power Amplifiers, Wiley, Chichester UK, 2008 (eng).
Frenzel Jr. L. E., Principles of electronic communication systems, 4th ed., McGraw-Hill Education, New York, NY, 2016 (eng).
McC. Siebert W., Circuits, Signals, and Systems, Cambridge, McGraw-Hill Book Company, MA, 1986. doi.org/10.7551/mitpress/1839.001.0001 (eng).
Pulse Generators, Ed. G. Glasoe. McGraw-Hill Book Company, NY, 1948 (eng).
Pliushch O., “Gradient Signal Processing Algo-rithm for Adaptive Antenna Arrays Obviating Reference Signal Presence,” presented at the IEEE International Scientific-Practical Conference PIC S&T, Kyiv, Ukraine, October 8–11, 2019, Paper 190. doi.org/10.1109/PICST47496.2019.9061536 .
Pliushch O., Vyshnivskyi V., Toliupa S., Rybydajlo A. “Utilization of Clipper Circuits to Improve Efficiency of the Gradient Signal Pro-cessing Algorithm for Adaptive Antenna Arrays” // Proceedings of the 2019 IEEE International Conference on Advanced Trends in Information Theory (IEEE ATIT 2019). Kyiv, Ukraine, December 18-20, 2019. Paper 71. doi.org/10.1109/ATIT49449.2019.9030529 (eng).
