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The modeling of measuring spectra of microwave pulses by high-pass filters

Keywords:

M.B. Goykhman – Junior Research Scientist, Institute of Applied Physics of RAS (N. Novgorod). E-mail: goihman@appl.sci-nnov.ru
A.V. Gromov – Junior Research Scientist, Institute of Applied Physics of RAS (N. Novgorod). E-mail: gromov@appl.sci-nnov.ru
S.P. Mar’ev – Leading Programmer, Institute of Applied Physics of RAS (N. Novgorod). E-mail: finist@appl.sci-nnov.ru
A.V. Palitsin – Ph. D. (Phys.-Math.), Research Scientist, Institute of Applied Physics of RAS (N. Novgorod). E-mail: pal@appl.sci-nnov.ru
Yu.V. Rodin – Leading Engineer, Institute of Applied Physics of RAS (N. Novgorod) E-mail: wish26@yandex.ru
S.E. Filchenkov – Ph. D. (Phys.-Math.), Research Scientist, Institute of Applied Physics of RAS (N. Novgorod). E-mail: fil@appl.sci-nnov.ru


The possibility of implementation of iterative method for measuring spectra of microwave pulses using high-pass filters (HPF) is shown. The method is based on iterative processing of measured initial signal envelope and envelopes of signals passed through HPFs with different cut-off frequencies. Iterative method has been examined for convergence and stability by numerical simulation on test signals and using experimentally measured characteristics of tunable X band HPF. On each iteration the spectrum of full signal is obtained by summation of spectrum sections corresponding to signals passed through different HPFs. The dependence of the spectrum reconstruction accuracy on the choice of spectrum sections is investigated, the criterion of successful spectrum reconstruction is formulated. It is shown that the iterative method allows to reconstruct the phase of high-frequency signal (with arbitrary constant) from measurements of initial signal envelope and envelopes of signals passed through HPFs with different cut-off frequencies. An extension of this method towards higher frequency bands is limited by characteristics of available filters and detectors and, in our opinion, is possible up to terahertz band. We are planning to implement this method to spectrum measurements of terahertz gyrotron using the set of waveguide HPFs. The proposed method for spectra measurements can be used not only with waveguide HPFs, but also with another types of HPFs with known amplitude and phase characteristics, for example, with HPFs on microstrip lines.
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