THE FREQUENCY TUNNING RANGE OF DIFFRACTION RADIATION OSCILLATOR WITH PERIODICAL STRUCTURE IN A DOUBLE GRATING FORM

Abstract

The diffraction radiation oscillator is one of the perspective sources for millimeter and T-wave, and it demands further improvement of its output characteristics. In the present work the influence of parameters of the periodic structure in a double grating form on the tuning range width of diffraction radiation oscillator is considered. It is shown that the tuning range width significantly depends on the H10-wave elongation in elementary waveguides, composed by the opposing slots of the double grating. The results of experimental measurements and 2D-modeling of the open resonant system properties are shown. The results allow choosing the double grating optimum parameters for diffraction radiation oscillator by the criterion of “extended tuning range plus high Q-factor of oscillations”. The experimental results of the DRO properties for 8-mm wavelength with several variants of the double grating parameters are presented.

Keywords

• diffraction radiation oscillator
• double grating
• millimeter waves
• open resonant system
• periodic structure