Download The Development of the Microwave Electronics Research Institute

The Development of the
Microwave Vacuum Electronics at
BVERI
Fujiang Liao and Jinjun Feng
Beijing Vacuum Electronics Research Institute
Vacuum Electronics National Lab
July 14th, 2010
Outline
• Introduction
• Microwave Power Module ( MPM )
• The Microwave Integrated Vacuum
Electronics
• Teraherz Vacuum Electron Devices
Introduction
• Recent years as the phase array antenna
system and wide band-gap semiconductor
devices develop, some system engineers
doubt if the microwave vacuum electron
tubes will be replaced by the wide band
gap semiconductor devices? What is the
directions of the vacuum electron devices
for the future?
• We try to answer this question and introduce some work we are doing.
The directions of Microwave Vacuum
Electron Devices
Some directions of microwave vacuum electron device developments should be:
• Microwave Power Module ( MPM );
• The microwave integrated vacuum electron
devices;
• Gyrotron
• Teraherz Vacuum Electron Devices.
Microwave Power Module ( MPM )
• MPM consists of solid state amplifier, electric
power conditioning and vacuum electron power
booster.
• MPM will be used in the phase array antenna
system to support the military equipment with
low cost microwave power devices.
• Next figure shows the MPM picture and small
size vacuum electron power booster (mini-TWT).
• This small size power booster is the core of
MPM.
MPM
Solid State
Amplifier
Vacuum Power
Booster
EPT
Microwave power module
the phase array antenna system
the phase array antenna system
• We are trying to use MPM into the active
phase array antenna system to replace the
semiconductor T/R module. The key
techniques are to reduce the power output
and the working voltage of TWT. It needs
also to reduce the TWT size.
• One task is to make the plane TWTs.
Miniaturized TWTs
Fabrication of slow-wave-structure
for mini TWT
Dielectric stud support with metal vane helix slow-wave structure are
developing at BVERI by welding and laser cutting with the support of National
key laboratory of high power vacuum electronics .
A plane TWT
• The Meander line is used to as slow wave
structure for plane TWT.
• PBG material is to use to replace the
ceramic substrate to support the
Meander line slow
wave structure.
Vacuum Micro Electronics Device
• With the field emission array cathode, the
mini TWT can be fabricated.
• Next picture shows the field emission
array cathode with DC current density
10A/cm2 made in BVERI.
Vacuum Micro Electronics Device
Field Emission Array Cathode
Put Field Emission Array Cathode into
the Traveling Wave Tube.
Microwave Integrated Vacuum
Electronics Devices
• Microwave integrated vacuum electron
device is made with 3D-MCM technique.
Mini TWTs, SSA, phase shifters, filters and
EPC are all integrate in the ceramic
substrate.
• Next picture shows the microwave integrated vacuum electron device.
Microwave Integrated Vacuum
Electronics Devices
RF Input
Attenuator
Phase shifter
SSA
gun
Collector
gun
Collector
EPC
Power out
Optical Control TWTs
• Picture shows the Optical beam and RF input
No RF input
optical control
here
TWT. Microwave
is modulated on
the optical beam.
Then the optical
beam is put on
the photoelectron
This electron current is microwave
cathode to make
modulated. It will make interaction
the electron
with RF structure of TWT to make
emission.
signal amplification.
Gyrotron
• Gyrotron can be worked at Ka band and
above. We are doing some research work
on the gyrotron at Ka band and W band.
• Ka band gyro-TWT made in China
Teraherz Vacuum Electron Devices
• TH vacuum electron device works at more
than 300GHz. The folded waveguide TWT,
Meander line or helix TWTs are also
developed at 100, 140, 220GHz.
Structures using micro-fabrication
Conclusion
• Professor Carter worked in the vacuum
electronics field for more than 40 years
and made great contributions in it. We
believe that he concern the directions of
microwave vacuum electronics.
• Microwave vacuum electronics is very
important devices for military and civilian
application in the next 20 years.
• Microwave vacuum electronics will combine with microelectronics, optoelectronics
to form some new devices.
The End
Thanks!