Open AccessReflection of waves from a mobile elastic layer in a multimode waveguide
Author(s) -
Е.С. Устинова,
Е.С. Устинова,
В. И. Воловач,
В. И. Воловач,
Т. А. Антипова,
Т. А. Антипова,
Kaira A. Adishirin-Zade,
Kaira A. Adyshirin-Zade
Publication year - 2021
Publication title -
fizika volnovyh processov i radiotehničeskie sistemy
Language(s) - English
Resource type - Journals
eISSN - 2782-294X
pISSN - 1810-3189
DOI - 10.18469/1810-3189.2021.24.2.73-78
Subject(s) - circulator , physics , reciprocity (cultural anthropology) , optics , phase velocity , wavelength , waveguide , group velocity , microwave , acoustics , reflection (computer programming) , multi mode optical fiber , wave propagation , optical fiber , computer science , psychology , social psychology , quantum mechanics , programming language
Waveguide structures are used to transmit energy and information signals in a wide range of wavelengths and, in terms of wave-guiding physical properties, usually have mutual (identical) properties in forward and backward directions. The asymmetry of the structure and external influences can often cause non-reciprocity of structures for waves, propagating in mutually opposite directions (this property, although limited, is already used in the so-called nonreciprocal devices of microwave, EHF and optical ranges such as ferrite valves, circulators, phase shifters). At the same time, the nonreciprocal properties of wave-guiding structures, independent of their physical nature, were not considered. It is found, that the motion of the medium filling the acoustic waveguide leads to nonreciprocity of its parameters in the forward and backward directions. The degree of nonreciprocity is proportional to the velocity of the medium. The velocity of the medium also affects the propagation velocity of acoustic waves and leads to a change in the critical frequencies or critical wavelengths of the waveguide modes. As the velocity of the medium increases, the number of modes for which the propagation condition is satisfied increases as well.