Загрузил dub080360

Орофемитрон_Романцов ЮА_ Киото 1993г

реклама
D6: Computer modeling and design of electronic and optical devices
Development of Smith-Purcell FEL using vacuum microelectronics technology
Yuri A. Romantsov
Radio Astronomy Institute of Ukrainian Acad. of Sc.
Kharkov,Ukraine
( Phone: (7-0572) 44-87-18, Fax: ( 7-0572) 47-65-06 )
Introduction
Vacuum microelectronics ( VM ) technology comes from silicon industry has been shown
now great promise for novel microwave electronic devices [ 1 ]. One possibility is that new types of
millimeter wave Smith-Purcell free electron lasers may be developed with the applying of low
voltage matrix field- emission electron sources. In the present paper, the new amplifiers and
oscillators of millimeter and submillimeter wave bands named as orofemitrons [2] are introduced.
Theory and design
The main elements of orofemitrons construction are an open resonator with the distributed
interaction and special electron gun with the field-emission emitters whose current is modulated by
the microwave signal. It seems to us the perspectiveness of the orofemitrons is stipulated by the use
in one design of the most effective in millimeter &
submillimeter wave bands orotron electrodynamic system
and the phenomena of microwave modulation of fieldemission .This technique of electron current bunching
showed its effectiveness in femitrons -amplifiers and
multipliers of X-band .
For example, a schematic diagram of the
orofemitron-amplifier is shown in Fig. The input signal
power Pinp increase due to the sharp slope of FowlerNordheim current-voltage characteristics of electron emitter
and the effective distributed interaction of electron beam with the open resonator field , as well as
due to the shaped electron bunches power increase under additional acceleration by voltage Ua
between emitter surface and output resonator.
The orofemitrons theory depend on the original mathematical model of microwave bunching
of field emission current and on well-known methods[3] of joint solution of Maxwell's equations &
equations of motion for resonance systems with distributed interaction.
Conclusion
The latest achievements in the VM technology and miniature open resonators design used for
development of orofemitrons allow to create compact high stability oscillators & amplifiers with
output power Pout 1100 W and efficiency 1050% in the middle range of MM waves
References
[1]Vacuum Microelectron. Dev.,IEEE Tr. Electron. Devices. ,36,11,1989,part 2
[2]Yu. A. Romantsov,Proc. of Int. Conf. on MM wave & F.-In.Tech.,Beijing,August,1992.
[3]D.Vavriv & O.Tretyakov,Theory of the Resonant Amplifiers with distributed
interaction,"Nauk. Dumka",1989
Скачать