"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 6, 2019

contents of issue      DOI  10.30898/1684-1719.2019.6.10     full text in Russian (pdf)  

UDC 621.365.5

Designing a slow-wave system for TWT Ku-band with a frequency band 16.5% and a gain of at least 30 dB

 

S. V. Zharihin, V. I. Panitskov, T. I. Polyanskaya

JSC "SPE " Shokin Istok" Vokzalnaya st. 2a-1, Fryazino, Moskow region 141190, Russia

 

The paper is received on June 14, 2019

 

Abstract. This article presents results of the design of a slow-wave system on coupled cavity circuit (CCC) of the Ku-band with operating frequency band 16.5% with output constant power of several kW and a gain of at least 30 dB. Variants of the slow-wave system(SWS) are considered, the optimal cutoffs of the sections of the slow-wave system, slope of the dispersion characteristics of the input and output sections, as well as the cutoffs and the period of the middle section are determined.

As a result of the calculations, 3 variants of projects of partitioned slow-wave system for TWT were obtained.

Option 1: 3-section SWS based on CCC with a resonator type of wave in the main passband; slow-wave system is designed for undervoltage and increased perveance: slow-wave system voltage Usw = 14 kV 1%, cathode current Icat. = 2.3 A;

Option 2: 3-section slow-wave system on the basis of a SWS type CCC with a resonator type of wave in the main passband: a voltage of slow-wave system Usw = 18.8 kV 1%, the cathode current Icat. = 1.7 A.

In both cases, the output section of the TWT has a flat dispersion characteristic, which may require additional design measures in the node of the output section to eliminate spurious generation in the high-frequency region of the main bandwidth. In addition, in version 1, difficulties may arise with focusing a high- perveance electron beam.

Option 3: 4-section slow-wave system based on SWS type CCC with a slit type of wave in the main passband; Usw = 18.85 kV 1%, cathode current Iсat. = 1.7 A. The output section has a rather flat dispersion characteristic, with a slope characteristic of broadband TWT on SWS of counter pin structures type; No special measures are needed to suppress parasitic generation in the high-frequency region of the base bandwidth of the SWS, however, the total length of the partitioned SWS has increased significantly by adding another section.

Building, configuring, and testing high-power continuous broadband TWTs is a fairly time-consuming process. This was demonstrated by the experience in the development and production of TWTs, the operating frequency bands of which approach 10% and are already quite wide with the required output parameters and mass-dimensional characteristics. The increase in the working frequency band of more than 1.5 times significantly increases the complexity of its manufacture. How much is surmountable and which of the three options for SWS should preferably be shown by an experimental study during a specially designed work.

Key words: powerful broadband TWT, coupled cavity circuit and counter pins, zones of generation, main band, amplitude-frequency characteristics.

References

1. Zharihin S.V. Panitskov V.I. Polyanskaya T.I, Stroykov E.A. Features of the development of high-power wideband TWT on the sectioned counter pin slowing structures and a coupled cavity circuit with a magnetic periodic focusing system.” Proceedings of VI All-Russian Conference Electronics and Microelectronics Microwave”, 2017, St. Petersburg, Saint Petersburg Electrotechnical University "LETI", 2017, Vol. 1, pp. 287-294. (In Russian)

2. Patent RF-RU: No.2293375, priority 11.11.2003: “Slow-wave system for traveling wave tube”. Aristarkhova O.N., Mazurova L.G., KryuchkovV.V., Andrianova E.P., Chernobay T.I., Ruvinsky G.V., Shelkunov G.P. (In Russian)

 

For citation:

S. V. Zharihin, V. I. Panitskov, T. I. Polyanskaya. Designing a slow-wave system for TWT Ku-band with a frequency band 16.5% and a gain of at least 30 dB. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 6. Available at http://jre.cplire.ru/jre/jun19/10/text.pdf

DOI  10.30898/1684-1719.2019.6.10