Millimeter Wave Multi-mode Transmission Line Components

Abstract

The present paper reports on the recent development of several oversized millimeter wave transmission line components for different applications. The studies include a circular TE 11 -to-Gaussian beam mode converting horn, a TM 01 -to-rotating TE 31 mode converter, a TE 11 -mode 90°bend, a series of different HE 11 -mode transmission line components, a notch filter and a fast laser controlled semiconductor microwave switch.

Measurements of Generated SHF-Power and Thermal Loads During the Testing of the Iter Prototype Gyrotrons at Testing Facility

“…Гиротроны Везувий-9 (а) и Везувий-10 (б) на испытательном стенде На рис. 2, а, б показаны схема и конструкция гиротрона [2]. В системе водяного охлаждения элемен-тов стенда регистрируются температура, давление, расход, а также наличие/отсутствие воды в магистра-лях охлаждения.…”

Development of Waveguide Semiconductor Switches of Microwave Radiation in the 70- and 260-ghz Ranges

“…1. Simplified operation principle of the semiconductor microwave switch: microwave input source (1), output microwave radiation (2), reflected microwave radiation (3), and laser radiation (4).…”

“…The waveguide band-stop filter described comprehensively in [3] can be chosen as such a structure. The main advantage of such a filter is the presence of a single deep resonance in a wide frequency range.…”

“…However, addition of a semiconductor plate to the filter structure changes significantly all quantitative parameters, namely, the frequency, the Q-factor, the number of resonances, and the frequency tuning range. Analytical estimates of the geometry and numerical calculations of the amplitude-frequency characteristic of a band-stop filter in [3] are not suitable for a switch, i.e., controlled band-stop filter. The main reason for this is the fact that any semiconductor plate, even an infinitesimally thin one, has two medium-air interfaces, which reflect the electromagnetic field significantly.…”

“…This modifies the resonant frequency even greater compared with the filter without a plate. The switch frequency is tuned by means of a mechanical screw by about 10%, which exceeds the width of the filter tuning range by ten times [3].…”