M. P. Natarov

Novel Design of Band-Pass Waveguide Filter With HTS E-Plane Insert

In this paper, the idea of a band-pass filter (BPF) with HTS E-plane insert in the cross waveguide is implemented in Ka-band. The advantage of this approach is to solve the problem of mounting HTS insert into the body of the metal waveguide in order to ensure good electrical contact. A three-step method for the synthesis and design of such a filter is proposed and implemented. The method includes synthesis of the normalized prototype filter, sequentially iterative synthesis of filter geometry, and the final synthesis with optimization using numerical electrodynamic analysis of the entire geometry. It is shown that for the narrowband BPF, resonance windows in the E-plane insert should be performed with accuracy better than ±0.2 μm. The characteristics of such filters are expected better or not worse than their counterparts on the basis of rectangular waveguides, but at less stringent conditions of fastening HTS insert in the body of the waveguide. For fabricating the BPF, epitaxial HTS YBa2Cu3 O7-δ films sputtered on both sides of MgO single crystal dielectric substrate of 0.5 mm thickness were used. The difference between losses in the produced filter and its simulated sample is explained with insufficient accuracy of making resonance windows in the HTS insert.

Characteristics of the wavegude to quasioptical or dielectric resonator couplings

The comparison of experimental characteristics for two type of the open resonator coupling elements has been done. The measurements of the characteristics of a number of DR coupling elements has been carried out. The physical interpretation of obtained results has been done on the basis of the analysis of the quasioptical open resonator coupling carried out earlier.

Determination method of water-glucose solution concentration at microwaves

We have presented the practical application of complex permittvity dielectromerty method to identify the glucose amount in water solution for modelling the determination of the glucose amount in human blood. We used disigned by us the waveguide-differential dielectrometer for the complex permittivity determination of high loss liquids such as water and water solutions. The complex permittivity of glucose water solution as a function of the glucose concentration was determined for the concentration from 0 to 100 mmol/L. It was shown that at the increase of glucose concentration in water solution their real and imaginary parts of the complex permittivity decrease monotonically.

Dielectrometry of pharmaceutical ingredient solutions at microwaves

The practical application of dielectrometry method to identify the pharmaceutical ingredients was held. The proposed waveguide-differential dielectrometer is used for the complex permittivity determination of high loss liquid such as water and water solutions in the millimeter wave range. This method allows a real-time determination of pharmaceutical ingredient content in water solution by measuring values of wave attenuation and phase coefficients difference in the differential measurement cavity. The complex permittivity of anatoxin, penicillin, gentamicin, lincomycin and glucose in fluid form as a function of the concentration was determined. The dielectric properties of various pH solutions have been determined as well. The sensitivity measurement have been detected of the water — glucose solution for its real and imaginary parts equal to 1.12 and 0.68 mmol/L, respectively.

Patterns of the three-band feed for a small VLBI radiotelescope reflector antenna

The results of an experimental study of patterns of the three-band feed for a small VLBI2010 compatible radio telescope reflector antenna are presented. Differences of the behavior of experimental three-band feed patterns and requirements specification for feed-prototype [1] are brought to light. A new engineering solution of the three-band feed unit has been suggested.

KA-Band, P-I-N switchable antenna array system

An original electrically switchable, Ka-band antenna array system has been recently developed, produced, and tested. The system consists of four identical sections, which are connected to radar transmitter/receiver by means of a high-power, multipole P-i-N switch. The introduced P-i-N switch enables for a fast electrical scanning of the antenna beam what essentially extends possible areas of the antenna system application. The antenna system is used in a helicopter collision avoidance, surveillance, and weather radar. This paper describes design features of the antenna system, its main characteristics, results of its testing, and the antenna integration in the radar.

Excitation of Quasioptical Resonator with Coupled Parallel-Plane Waveguides on a Mirror by Gunn Diode

A novel quasioptical resonator systan for solid state oscillators suitable for near-millimeter weves range is proposed. Q-factor of the cavity about 104 wes achieved. Effective excitation of the proposed resonator system by Gunn diode was obtained. A power combining of two diodes has been realized.