A. Kostrov, A. Kudrin, A. A. Shaikin, A. I. Smirnov, M. Starodubtsev, T. Zaboronkova
The results of experimental and theoretical investigations of whistler wave emissions from loop radiators immersed in magnetoplasma are discussed, The parameters of our laboratory experiment were chosen such as to model the operation of antennas on board a spaceship in whistler frequency range in space plasma. The experiments were carried out in a large-scale set-up "Tonosfera" (length 150cm, diameter 80cm) containing a uniform plasma column in a magnetic field directed along the set-up axis. The plasma is produced with high-frequency inductive discharge. A rather large volume of the uniform plasma allows studding the processes without an influence of the set-up walls on the plasma parameters. First, the radiation of loop antennas at low power levels fed to the antenna when no plasma density perturbations were occurred, was studied [I]. At the enhanced power levels (P > 80W) the inhomogeneous structure along the magnetic field may be formed as a result of the nonlinear interaction between the electromagnetic field and surrounding plasma. The waveguide channel can arise due to the electron heating by the quasistatic field of the antenna and the thermal-diffusion redistribution of the plasma connected with it [2]. It is shown that nonuniform distribution of plasma density near the loop causes the variation of the radiation patterns and the value of radiation resistance with respect to a uniform plasma. Then the possibility is shown of controlling the electrodynamics characteristics of VLF loop radiators immersed in a magnetoplasma with the help of feeding the additional intensive impulse at the frequency w > wo where WO is the operation frequency. This impulse creates the intensive near-antenna field whose ponderomotive force moves the plasma away the antenna surface. Simultaneously, this field provides plasma heating along the magnetic field as well as in the case described in [2]. The presence of the ponderomotive force effects appreciably the input antenna impedance at the operation frequency. In particular, this can improve the antenna matching in plasmas. Additionally, the appearance of large-scale strong density perturbations can change the radiation patterns of loop antennas.
{"title":"Emission of whistler waves from loop radiators in nonuniform magnetoplasmas","authors":"A. Kostrov, A. Kudrin, A. A. Shaikin, A. I. Smirnov, M. Starodubtsev, T. Zaboronkova","doi":"10.1109/AEM.1996.873085","DOIUrl":"https://doi.org/10.1109/AEM.1996.873085","url":null,"abstract":"The results of experimental and theoretical investigations of whistler wave emissions from loop radiators immersed in magnetoplasma are discussed, The parameters of our laboratory experiment were chosen such as to model the operation of antennas on board a spaceship in whistler frequency range in space plasma. The experiments were carried out in a large-scale set-up \"Tonosfera\" (length 150cm, diameter 80cm) containing a uniform plasma column in a magnetic field directed along the set-up axis. The plasma is produced with high-frequency inductive discharge. A rather large volume of the uniform plasma allows studding the processes without an influence of the set-up walls on the plasma parameters. First, the radiation of loop antennas at low power levels fed to the antenna when no plasma density perturbations were occurred, was studied [I]. At the enhanced power levels (P > 80W) the inhomogeneous structure along the magnetic field may be formed as a result of the nonlinear interaction between the electromagnetic field and surrounding plasma. The waveguide channel can arise due to the electron heating by the quasistatic field of the antenna and the thermal-diffusion redistribution of the plasma connected with it [2]. It is shown that nonuniform distribution of plasma density near the loop causes the variation of the radiation patterns and the value of radiation resistance with respect to a uniform plasma. Then the possibility is shown of controlling the electrodynamics characteristics of VLF loop radiators immersed in a magnetoplasma with the help of feeding the additional intensive impulse at the frequency w > wo where WO is the operation frequency. This impulse creates the intensive near-antenna field whose ponderomotive force moves the plasma away the antenna surface. Simultaneously, this field provides plasma heating along the magnetic field as well as in the case described in [2]. The presence of the ponderomotive force effects appreciably the input antenna impedance at the operation frequency. In particular, this can improve the antenna matching in plasmas. Additionally, the appearance of large-scale strong density perturbations can change the radiation patterns of loop antennas.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130816233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A contribution to the problem of plane wave diffraction by gratings","authors":"A. G. Kyurkchan, A.I. Kleev","doi":"10.1109/AEM.1996.873045","DOIUrl":"https://doi.org/10.1109/AEM.1996.873045","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116015605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The increasing use of anisotropic elements in many applications ranging from microwaves to optical frequencies has prompted the study of electromagnetic wave propagation in anisotropic media. In the last decade there has been renewed interest in electromagnetic. waves in amisOttopic media and parriculatly in bounded gyrotropic plasma in connection with magnetized-plasma column, sustained by surface wave [1,2] (see also review [3]), Werent applications in microphysics [4,5], high power generation [6,7] energy transform in space 181 etc. The investigations of plasma waveguide has shown that many problems in gyrotropic plasma are not clear (91. For this reason a detail analysis of known and unknown phenomena of propagation of surface poladons-plasmons along the interface of gyrotropic plasma has been conducted. It is shown that many new wave characteristics appear due to the Rayleigh kind of the wave. The influence of both the active and the inactive media is considered. The existence of many new phenomena is proved: the end point of the dispersion in strongly magnetized plasma, the three t y p of leaky waves with complex longitudinal wave constant and theits connection with surface wave in transverse bounded system, the slngular waves etc. This work has been supported by DAAD and grant F-408 of the Bulgarian National Fund for Scientific Research,
{"title":"Surface magnotoplasmons along the interface of gyrotropic plasma","authors":"S. Ivanov, N. Nikolaev, P.I. Dankov, R. Thomae","doi":"10.1109/AEM.1996.873108","DOIUrl":"https://doi.org/10.1109/AEM.1996.873108","url":null,"abstract":"The increasing use of anisotropic elements in many applications ranging from microwaves to optical frequencies has prompted the study of electromagnetic wave propagation in anisotropic media. In the last decade there has been renewed interest in electromagnetic. waves in amisOttopic media and parriculatly in bounded gyrotropic plasma in connection with magnetized-plasma column, sustained by surface wave [1,2] (see also review [3]), Werent applications in microphysics [4,5], high power generation [6,7] energy transform in space 181 etc. The investigations of plasma waveguide has shown that many problems in gyrotropic plasma are not clear (91. For this reason a detail analysis of known and unknown phenomena of propagation of surface poladons-plasmons along the interface of gyrotropic plasma has been conducted. It is shown that many new wave characteristics appear due to the Rayleigh kind of the wave. The influence of both the active and the inactive media is considered. The existence of many new phenomena is proved: the end point of the dispersion in strongly magnetized plasma, the three t y p of leaky waves with complex longitudinal wave constant and theits connection with surface wave in transverse bounded system, the slngular waves etc. This work has been supported by DAAD and grant F-408 of the Bulgarian National Fund for Scientific Research,","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125899073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A full-wave method for calculating of resonant frequences of 2-D microstrip grating on the substrate having arbitrary number of layers and arbitrary form of anisotropy is presented. An algorithm is based on the 4x4 transfer matrix and integral equations methods.
{"title":"A full-wave analysis of two-dimensional microstrip grating on the multilayered anisotropic substrate","authors":"I. Nefedov","doi":"10.1109/AEM.1996.872868","DOIUrl":"https://doi.org/10.1109/AEM.1996.872868","url":null,"abstract":"A full-wave method for calculating of resonant frequences of 2-D microstrip grating on the substrate having arbitrary number of layers and arbitrary form of anisotropy is presented. An algorithm is based on the 4x4 transfer matrix and integral equations methods.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124783588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Kaifas, S. Koukourlis, T. Samaras, D. Babas, J. Sahalos
{"title":"On the study of nondistortive behaviour of coupled microstrip pairs","authors":"T. Kaifas, S. Koukourlis, T. Samaras, D. Babas, J. Sahalos","doi":"10.1109/AEM.1996.872862","DOIUrl":"https://doi.org/10.1109/AEM.1996.872862","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126935778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A parallel method of moments (PMoM) technique","authors":"D. Kaklamani, A. Marsh","doi":"10.1109/AEM.1996.873080","DOIUrl":"https://doi.org/10.1109/AEM.1996.873080","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130260430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The modulatory effect of MM-range electromagnetic waves 0 on the betics of acidic hemolysis of erytrocytes was investigated. More and less acidresistant erytrocytes in blood during hemolysis were revealed. A sisnificant negative correlation between quantity of this two populations in blood ( ~0.99, p<0.005 ) was seen. Non-thermal irradiation of 0.5 ml of blood by means of wide-band noise generator ,,Artsakh-O2m" during two hours have been taken in vitro condition. The erythrocytes reactivity (ER) to MMW were determined by variation of the rate constant of less acidresistant erythrocytes after irradiation with MMW ( noise frequency band cover 40-95 GHz, with integral noise power of 0.01 mW ).
{"title":"The three stages of erythroctytes reactivity to MM-waves during diabetes mellitus","authors":"A. Oganessian, S. Oganessian, R. Avakian","doi":"10.1109/AEM.1996.872891","DOIUrl":"https://doi.org/10.1109/AEM.1996.872891","url":null,"abstract":"The modulatory effect of MM-range electromagnetic waves 0 on the betics of acidic hemolysis of erytrocytes was investigated. More and less acidresistant erytrocytes in blood during hemolysis were revealed. A sisnificant negative correlation between quantity of this two populations in blood ( ~0.99, p<0.005 ) was seen. Non-thermal irradiation of 0.5 ml of blood by means of wide-band noise generator ,,Artsakh-O2m\" during two hours have been taken in vitro condition. The erythrocytes reactivity (ER) to MMW were determined by variation of the rate constant of less acidresistant erythrocytes after irradiation with MMW ( noise frequency band cover 40-95 GHz, with integral noise power of 0.01 mW ).","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127834087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The problem of coupling from one region to another through an aperture in a conducting wall is an important one in the theory of electromagnetic compatibility and interference. This problem was formulated in terms of two admittance operators, one for each region, applying the equivalence principle. These operators are complex and symmetric. In the characteristic modeo theory suggested by Harrington [1], the real eigenvalues of the generalized problem we the imaginary part of the modal admittances and the real weighted orthogonal eigenvectors are the equivalent magnetic currents in the aperture. This theory was applied for some special problems, such like slot in a conducting plane [2] and slot in a conducting cylinder [3], both for the TE end TM cases of excitation. The mutual coupling between two circular holes in a conducting screen is considered in [4].
{"title":"On characteris modes of a circular hole in a cunducting plane","authors":"S. Savov","doi":"10.1109/AEM.1996.873068","DOIUrl":"https://doi.org/10.1109/AEM.1996.873068","url":null,"abstract":"The problem of coupling from one region to another through an aperture in a conducting wall is an important one in the theory of electromagnetic compatibility and interference. This problem was formulated in terms of two admittance operators, one for each region, applying the equivalence principle. These operators are complex and symmetric. In the characteristic modeo theory suggested by Harrington [1], the real eigenvalues of the generalized problem we the imaginary part of the modal admittances and the real weighted orthogonal eigenvectors are the equivalent magnetic currents in the aperture. This theory was applied for some special problems, such like slot in a conducting plane [2] and slot in a conducting cylinder [3], both for the TE end TM cases of excitation. The mutual coupling between two circular holes in a conducting screen is considered in [4].","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129258141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The symbolic analysis of complex circuits suffers from expoventid growth of computation time with the increase of circuit complexity and number of symbolic terms [l]. To overcome this problem, when symbolic analysis of complex microwave circuits in terms of power-wave variables is considered, we suggest a hierarchical approach similar to the diakoptic method [2]. The method requires at least three steps.
{"title":"Symbolic analysis of complex microwave circuits in terms of flower-wave parameters","authors":"P. Petkovic, V. Markovic, V. Litovski","doi":"10.1109/AEM.1996.873134","DOIUrl":"https://doi.org/10.1109/AEM.1996.873134","url":null,"abstract":"The symbolic analysis of complex circuits suffers from expoventid growth of computation time with the increase of circuit complexity and number of symbolic terms [l]. To overcome this problem, when symbolic analysis of complex microwave circuits in terms of power-wave variables is considered, we suggest a hierarchical approach similar to the diakoptic method [2]. The method requires at least three steps.","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125364115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Plane wave diffraction by an anisotropic impedance halfplane","authors":"S.G. Vashtalov","doi":"10.1109/AEM.1996.873051","DOIUrl":"https://doi.org/10.1109/AEM.1996.873051","url":null,"abstract":"","PeriodicalId":445510,"journal":{"name":"Trans Black Sea Region Symposium on Applied Electromagnetism","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125501082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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