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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v75.i7.10
pages 575-585

REFLECTION RESONANCES IN A RECTANGULAR WAVEGUIDE SECTION WITH TWO OPPOSITELY ORIENTED RECTANGULAR POSTS

L. P. Mospan
A.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine
S. A. Prikolotin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
A. A. Kirilenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine

RÉSUMÉ

Purposive and controllable introduction of attenuation poles in the frequency response of a frequency selective device is among the most widespread techniques which are used in the course of designing modern filters with complex performance. This approach can be successfully implemented using rectangular waveguide sections with metal inserts. The study is aimed at investigating the scattering characteristics of sections with two oppositely oriented rectangular posts treated as waveguide structures with rotational symmetry. The results are compared with the characteristics of a section with two codirectional posts which structure is characterized by mirror symmetry. The resonance effects are interpreted with the use of the spectral theory of open waveguide resonators. According to the approach the reflection resonances supported by sections of the kind represent responses to excitation of natural oscillations at complex-valued frequencies. It is shown that application of the spectral theory makes it possible to improve by an order of magnitude (as compared with the conventional modal analysis) accuracy of estimating the basic parameters of the reflection resonances, specifically, resonance frequency and Q-factor. The obtained results provide the procedure of preliminary synthesis of frequency-selective devices on the basis of such sections to be more accurate and physically transparent.


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