Design of a KA-band helix traveling wave tube for LMDS (local multipoint distribution service)

Design of a KA-band helix traveling wave tube for LMDS (local multipoint distribution service)

Summary form only given. A Ka-band helix traveling-wave-tube (TWT) amplifier is designed. A sheath helix theory and HFSS code are validated by benchmarking the Northrop-Grumman's C-band TWT amplifier. Electron gun was designed by the Pierce gun theory, EGUN code, POISSON code and MAGIC 2D code....

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Hauptverfasser: Na, Y.H., Shin, J.W., Lee, S.J., Ko, Y.S., Kim, H.S., Uhm, H.S.
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Cathodes
Chebyshev approximation
Circuit faults
Circuit simulation
Circuit testing
Coupling circuits
Current density
Electron beams
Gain
Magnets
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container_start_page 308
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creator Na, Y.H.
Shin, J.W.
Lee, S.J.
Ko, Y.S.
Kim, H.S.
Uhm, H.S.
description Summary form only given. A Ka-band helix traveling-wave-tube (TWT) amplifier is designed. A sheath helix theory and HFSS code are validated by benchmarking the Northrop-Grumman's C-band TWT amplifier. Electron gun was designed by the Pierce gun theory, EGUN code, POISSON code and MAGIC 2D code. Cathode diameter is 1.6 mm to load beam current density 2 A/cm 2 . 49 magnets of PPM were used to focus electron beam. EGUN and MAGIC 2D simulation shows 8% of beam ripple. Coupler is designed by Chebyshev transformer theory and HFSS code, fabricated and tested. A Ka-band helix circuit is designed by the use of the sheath helix theory and HFSS code. The Pierce linear gain theory predicts a linear gain growth rate and a helix circuit length. The MAGIC 2D code and 1D LMSUITE code are utilized to predict a large signal, non-linear performance of the amplifier. Simulations show that saturated amplified output power is 40 W at 26-30 GHz, corresponding to electronic efficiency of 8% and gain of 47 dB where beam voltage, current and axial magnetic field are 9.4 kV, 80 mA and 2200 gauss, respectively
doi_str_mv 10.1109/PLASMA.2006.1707181
format Conference Proceeding
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subjects Cathodes
Chebyshev approximation
Circuit faults
Circuit simulation
Circuit testing
Coupling circuits
Current density
Electron beams
Gain
Magnets
title Design of a KA-band helix traveling wave tube for LMDS (local multipoint distribution service)
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