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Microwave tubes cover the wide range of RF spectrum. Up to 30 GHz they are usually termed as microwave tubes and beyond that they are known as millimeter wave tubes. They are widely used for generation and amplification of RF signals. These devices came into prominence around World War - II when pulse magnetrons were substantially used in radar systems. Later on, other devices like klystron, backward...
In view of the trend in and requirement of microwave tubes, it is necessary to identify areas and involve academia in research and development with national laboratories and industries through sponsored projects. All concerned in the community established academic institutions, national laboratories, industries, and users must exploit the huge potential in large number of engineering college students...
In this paper, a two dimensional large signal analysis of helix traveling wave tube (TWT) is done for non-ideal beam launching. This actually means that the electrons enter the interaction region with an initial radial velocity. Focussing magnetic field is used in axial direction to confine the beam as it progresses down the interaction region. It is also shown that the TWT can sustain a radial velocity...
A high power amplifier has been developed for the RIB program, where in a typical 1 kW triode based amplifier drives a high power 40 kW (CW) radio frequency amplifier for the frequency range of 32 MHz to 39 MHz. This driver amplifier has been realized in grounded grid configuration. The analysis of this amplifier has been carried out using ABCD parameters method. It uses a linear small-signal AC model...
High power microwave tubes can generate power in MW level even at frequency above 100 GHz. These tubes are a necessity for various applications like high data rate ground and space communications, defence and civilian radars, linear accelerators, plasma heating, and e-bomb. Solid-state devices are not available to meet these objectives because of their power level in few watts. Some of the important...
In recent past, there has been intense interest for the development of devices around 100 GHz using technologies of solid state devices as well as of vacuum tubes. In the present work we have synthesized serpentine folded waveguide structure based on an analytical approach. Beam parameter 10 kV beam voltage, 50 mA beam current and 200 micron beam diameter have been used for this synthesis. Synthesized...
C-band, 60 W space TWT of overall efficiency of about 55% has been designed at CEERI for satellite communication system. As the efficiency achieved in this TWT is comparatively less, studies are being carried out to enhance the efficiency of this TWT by evaluating various parameters used for improving the efficiency. This paper present the analyses and studies of various parameters needed for the...
A simplified but improved approach for the design of helical SWS design has been developed. Three TWTs operated at three deferent operating band have been designed and developed by using the same approach and validated with experimental results.
Efficiency of Space-TWT is of prime concern along with the long life and high reliability. The collector efficiency plays a major role in determining the desired overall tube efficiency. Various collector efficiency enhancement techniques are employed. This paper describes the use and development of technology of carbon coated OFHC copper electrodes in multi-stage depressed collector for the enhancement...
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