Morse critical points in diffraction radiation oscillators

Perspectives of Application of New Modifications of Resonant Quasi-Optical Structures in EHF Equipment and Electronics

“…The investigations results shown in [9,10] proved that the excitation due to the comb filter is insignificant in such a system if the minimum of the field distribution is above the boundary between the grating and the mirror. This occurs at the DR width, which is larger than or equal to the width of the main lobe of the 20q ТЕМ oscillation field.…”

“…To eliminate this phenomenon we suggested the semi-spherical OR, in which only the central part of the plane mirror surface was covered with the diffraction grating [9,10]. This resonators has a rarefied spectrum of oscillations, the oscillation loss depends upon the parameters and the width of the grating.…”

“…1) into the semi-spherical OR. Such an electrodynamic system is used in diffraction radiation oscillators [9,10]. The DRO operation principle is based on the diffraction radiation effect, which is excited by the electron beam propagating in the vicinity of the diffraction grating positioned in OR [9,10,[26][27][28][29][30][31][32][33].…”

“…While solving these problems new approaches were required. They were suggested and realized in the form of various modifications of multi-coupling open electrodynamic systems like coupled OR [10,16,17], open waveguides (ОW) [5,15,[18][19][20], ОR with dispersion elements [12], as well as the devices with metal-dielectric structures (МDS) [21][22][23], on the basis of which it was possible to realize the Cherenkov diffraction mechanisms of waves excitation [10]. Reasonability of the above solutions is substantiated in [24].…”

“…In particular, a series of efficiently operating MSM-wave band measurement devices -resonant wave meters with plane and concave metal mirrors, reference oscillators, resonant systems of the devices used for investigation of properties of the substances [1,[6][7][8] -is developed on the basis of OR. Semi-spherical and sphero-cylindrical OR, upon one of the mirrors of which the reflective diffraction grating (DR) is positioned, are used at creation of various modifications of the diffraction radiation oscillators (DRO) [2,[9][10][11], having as compared to the "classical" devices (BWT, klystron, magnetron) improved frequency stability and output power . On the basis of OR with corner-echelette mirrors there are created the efficient semiconductor oscillators on the basis of Gunn diodes and IMPATT diodes, quasi-optical oscillatory systems of which are realized based on the circuit with reactive reflecting and transmission resonators [12].…”