Title :
The derivation of space-charge-limited current between concentric sphere
Author :
Fei, Li ; Liu, Xiao ; Pu-Kun, Liu ; Hong-Xia, Yi
Author_Institution :
Key Lab. of High Power Microwave Sources & Technol., Chinese Acad. of Sci., Beijing, China
Abstract :
In high-power microwave diode design, the space-charge-limited current is important because of its relation to the diode impedance, and the formation of the virtual cathode. Although the Langmuir-Blodgett law, as a numerical solution, is helpful, a simple functional expression would be more convenient for practical research and the divergence of the series for large Rc/Ra would be avoided. First principle has been applied to derivate two-dimensional space-charge-limited current for planar plane capacitor and coaxial cylinders and its reliability has been examined adequately. This paper obtained the functional expression of space-charge-limited current for concentric sphere, the space-charge factor in this expression is got by comparison with classical Langmuir flow between concentric sphere.
Keywords :
microwave diodes; space charge; vircators; Langmuir flow; Langmuir-Blodgett law; coaxial cylinder; concentric sphere; diode impedance; high power microwave diode design; planar plane capacitor; space-charge factor; space-charge-limited current; virtual cathode; Bismuth; Cathodes; Electric fields; Integrated circuits; Laboratories; Microwave technology; Reliability; concentric sphere; first principle; space-charge-limited current;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2011 IEEE International
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-8662-5
DOI :
10.1109/IVEC.2011.5746917