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The possibility of complex reflection coefficient value estimation via discrete Fourier transform of output signals of equidistant probes in multiprobe measuring line is considered. This approach provides linear problem and explanation of known previous results. The general features of this approach and the holography with colliding beams are under discussion. The influence of noise on accuracy of...
The behavior of quasi-periodic and aperiodic (chirp) Bragg structures with thin lossy layers was examined. In order to determine the frequency dependence of the reflection coefficient transmission matrix method was used. A deep minimum of the reflection coefficient for any frequency is implemented by proper choice of the thickness of the last thin film and its optical distance to the substrate. The...
The time delays of pulses reflected from periodic and non-periodic Bragg layered structures have been investigated. The specific structures such as Bragg reflectors and structures with chirp variation of thickness of the “period” have been considered. The calculation has been carried out under the conditions that carrier frequency is in the vicinity of the Bragg resonance values. The parameters of...
Results of metal plate reflection coefficient estimation using experimental data obtained under variation of the distance between object and the aperture plane of measuring antenna in the form of a pyramidal horn with application of 3-probe meter and neural network for calibration are presented. Parametric spectral analysis in sliding windows was applied.
The problem of creating meter of complex reflection coefficient based on the electromagnetic approach using E-plane cross-shaped divider is studied. System of the integral equation describing scattering waves by the E-cross is solved. Rigorous electromagnetic model of direct and inverse problems of five-port measurements of complex reflection coefficient is derived. Frequency dependencies of model...
The problem of measurement of modulus of the reflection coefficient (RC) in wide frequency band in presence of additional reflections such as reflections in a horn antenna is considered. The Prony's method and the method of separation of autocorrelation function of layered structure by windowing in time domain for the restoration of the square modulus of the RC in wide frequency band were compared.
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