Silicon carbide for high-power applications at MM and THz ranges

Dielectric parameters of the modern low-loss ceramics in the microwave, millimeter, and submillimeter ranges.

“…The study of dielectric parameters of low-loss ceramics and technological possibilities of their improvement is a very actual problem [1][2][3]. It currently has a considerable attention in Russia and China.…”

“…and Public Corporation "Magneton" (St.-Petersburg). The measurements of the refractive index and dielectric loss were conducted using different methods and measurement setups in the PC "Magneton" [1,2], Institute of Applied Physics of RAS (IAP) [3][4][5][6][7][8], and Fryazino branch of the Kotel'nikov Institute of Radioengineering and Electronics of RAS (FIRE) [9,3].…”

Dielectrics for output windows of medium power gyrotrons

“…3 (above) and Fig. 5 from [8] leads us to the conclusion that 6H-SiC disk can transmit several times more powerful beam than BN or quartz disks. But if we use BN with high crystal perfection and high thermal conductivity then such material can also provide several hundred kilowatts level for the CW mode in the sub-THz range.…”

“…Using data on dielectric losses and thermal properties of the samples we made a calculation of temperature distribution for a disks used as gyrotron output windows in the continuous-wave operation (CW). The calculation was made in a similar way as in [8]. We used Newton's law of cooling as the boundary condition on the perimeter.…”

Heterostructures “Ferroelectric Film/Silicon Carbide” for High Power Microwave Applications

“…Thin BST films were deposited on SiC substrates fabricated by Svetlana-Electronpribor (St. Petersburg, Russia) [36,37] by RF magnetron sputtering of a Ba 0.4 Sr 0.6 TiO 3 ceramic target. Oxygen was used as a working gas at a pressure of 2 Pa providing optimal conditions for thin film deposition, oxidation of sputtered atoms, and crystallization of perovskite phase.…”