B.M. Katz1, K.A. Sayapin2

1,2 NIKA-Microwave, Ltd. (Saratov, Russia)

2 Saratov National Research State University. N.G. Chernyshevsky (Saratov, Russia)

2 LLC “SVV” (Moscow, Russia)

1 brs19520@yandex.ru; 2 sayapin.k.a@mail.ru