CST – Computer Simulation Technology

Title:
Simulation of Microfabricated Folded Waveguide Traveling-Wave Tube as Broadband Terahertz Amplifier
Author(s):
Ruilin Zheng, Haisheng San, Xuyuan Chen
Source:
Asia Pacific Microwave Conference, 2009. APMC 2009.
Vol./Issue/Date:
Dec. 2009
Year:
2009
Page(s):
1469 - 1472
Keywords:
Broadband amplifier, folded waveguide, simulation, terahertz, traveling-wave tube
Abstract:
In this paper, electromagnetic field simulations and related results of a 400GHz central frequency microfabricated folded waveguide traveling-wave tube were presented, for a broadband terahertz amplifier. 3-D cold-test (absence of real electron beam) and particle-in-cell simulations were carried out. Two models of different beam tunnel crosssection, i.e. cylindrical and rectangular, were simulated. It was found that the rectangular tunnel model is similar to the cylindrical tunnel model in cold-test properties, when the transverse square side length is 85% to the diameter of the cylindrical tunnel. The three-dB bandwidth is 40.6GHz and the maximum gain is 15.8dB at 393.3GHz, for an 18.5mm-long (60periods) loss-free circuit, predicted by Pierce small signal theory. Particle-in-cell simulation also revealed the three-dB bandwidth of ~35GHz and ~30GHz for cylindrical-tunnel model and rectangular-tunnel model, respectively, for a 29.6mm-long (96periods) loss-free circuit with concentrated attenuator. It is also found that the gain of rectangular-tunnel model is about 5dB lower than that of cylindrical-tunnel model, for 29.6mmlong circuit. The loss-free saturated output power and the linear gain of cylindrical-tunnel model at 400GHz are 6.9W and 28dB, respectively.
Document:

Back to References

contact support

Your session has expired. Redirecting you to the login page...

We use cookie to operate this website, improve its usability, personalize your experience, and track visits. By continuing to use this site, you are consenting to use of cookies. You have the possibility to manage the parameters and choose whether to accept certain cookies while on the site. For more information, please read our updated privacy policy


Cookie Management

When you browse our website, cookies are enabled by default and data may be read or stored locally on your device. You can set your preferences below:


Functional cookies

These cookies enable additional functionality like saving preferences, allowing social interactions and analyzing usage for site optimization.


Advertising cookies

These cookies enable us and third parties to serve ads that are relevant to your interests.