A New Method of Complex Dielectric Permittivity Determination
The article proposes a new method of complex dielectric permittivity determination based on the use of surface wave resonator. This method is applied to fluorocarbon polymer-4, yttrium stabilized-zirconium and sapphire at frequency band 6-70 GHz.
Irradiation of HTS Josephson junctions with the surface wave resonator
The new type of surface wave resonator (SWR) consists of HTS film on a dielectric substrate is developed. A possibility of optimal coupling between the electromagnetic field of the SWR and the HTS Josephson junction array is shown; The topologies for embedding the bicrystal HTS Josephson junctions in the SWR are developed. These topology ensure the junction synchronization, that can be used for creation voltage standards, microwave detectors and Josephson generators and so on; The microwave properties of the SWR with HTS Josephson junction arrays (up to 450 junctions) and nonlinear elements based on Shottky-barrier diodes have been investigated. For the array with 450 HTS Josephson junctions the voltage sequence with 10 mV step has been obtained, sensitivity of the detector based on this array is 0.1 A/W with dynamic range 10/sup 2/ dB; The Josephson generation with microwave power at several nW for the SWR with bicrystal HTS JJs is detected. There were two groups of junctions. These groups are formed at the time of fabrication due to imperfection of HTS junction fabrication technology.
Surface wave HTS resonators
Nowdays microwave electronics and measuring technics use microstrip and parallel-plate resonators. They must contain two superconducting films to have high quality Q. Besides the manufacture of such resonators for short-wave part of millimeter of waveband is accompanied by both the difficulties of design and increase of losses in the input microstrip and coaxial circuits. For that reasons we have elabarated several microwave resonators using a single metal or HTS surface (existence of other surfaces only decreases Q). All resonators operate on the surface waves, running along metal. That can be surfase waves running along a solitary metal surface with a finite conductivity (Zennek waves) or surface waves along metal (even ideal) covered with dielectric. As a result, the microwave resonators can be formed with the properly sized pieces of an HTS wire, rod, plate, single-side film on a dielectric substrate. Theoretical analysis of the resonant frequencies has been carried out by decomposition method [3,4]. Resotator, which use two dielectrics is placed in waveguide has been considered. . Such resonator is shown on Fig. 1. Firstly, the own waves of waveguide which has section shown on Fig. 1 were described for determination of the resonant frequencies of such resonator. Waveguide has been devided into four partial areas: I. O