Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256221
L. Kovalevsky, R. Langley, P. Besnier, J. Sol
The Statistical Energy Analysis (SEA) is a statistical approach employed to solve high frequency problems of electromagnetically coupled reverberant cavities at a reduced computational cost. The key aspect of this approach is to avoid solving Maxwell's equations inside the cavity, using the power balance principle, which leads directly to the ensemble mean response of the system. In addition, the SEA gives an estimate of the standard deviation of the cavity's energy. Moreover, the diffuse field reciprocity formula is used to calculate the coupling coefficient induced by an aperture, which is neither electrically small nor large. The numerical results obtained for two rooms coupled through a circular aperture are compared with experimental data obtained in the reverberation chamber at IETR. After a brief introduction of the motivation for such a method, the SEA equations are presented, and then the experimental setup is described in section III. Finally, the good agreement between simulation and experiment is presented in section IV.
{"title":"Experimental validation of the Statistical Energy Analysis for coupled reverberant rooms","authors":"L. Kovalevsky, R. Langley, P. Besnier, J. Sol","doi":"10.1109/ISEMC.2015.7256221","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256221","url":null,"abstract":"The Statistical Energy Analysis (SEA) is a statistical approach employed to solve high frequency problems of electromagnetically coupled reverberant cavities at a reduced computational cost. The key aspect of this approach is to avoid solving Maxwell's equations inside the cavity, using the power balance principle, which leads directly to the ensemble mean response of the system. In addition, the SEA gives an estimate of the standard deviation of the cavity's energy. Moreover, the diffuse field reciprocity formula is used to calculate the coupling coefficient induced by an aperture, which is neither electrically small nor large. The numerical results obtained for two rooms coupled through a circular aperture are compared with experimental data obtained in the reverberation chamber at IETR. After a brief introduction of the motivation for such a method, the SEA equations are presented, and then the experimental setup is described in section III. Finally, the good agreement between simulation and experiment is presented in section IV.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129485819","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256334
D. Tsyanenka, E. Sinkevich, Y. Arlou, S. Maly
A technique for calculation of currents in transmission lines in a wide frequency range is proposed. The technique is based on a generalization of the lumped-circuit calculation methods to the case of long transmission lines by the introduction of refinement functions. A worst-case model for the amplitude-frequency characteristics of currents in the transmission line is developed on the basis of the proposed technique. The model is intended for diagnostics (express analysis) of electromagnetic compatibility in complexes of radio and electronic equipment. Worst-case nature of the model is provided by construction of the envelope of the current's maxima (observed at resonances) for the high-frequency band. The validity of the model is checked by comparison with the results of numerical simulation of single wire above ground plane, twowire, coaxial, and triaxial transmission lines in a wide range of parameter values: the frequency is varied from 10 kHz to 8 GHz, the length of the line is from 20 cm to 5 m, height of the line above the ground surface is from 2 mm to 100 mm, the ratio of the load capacitance (inductance) to the line capacitance (inductance) is from 10-40 to 104. Straight and piecewise-straight lines (both parallel and non-parallel to the ground plane) are considered during the validation.
{"title":"Computationally-effective worst-case estimation of currents in transmission lines for EMC diagnostics of big systems","authors":"D. Tsyanenka, E. Sinkevich, Y. Arlou, S. Maly","doi":"10.1109/ISEMC.2015.7256334","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256334","url":null,"abstract":"A technique for calculation of currents in transmission lines in a wide frequency range is proposed. The technique is based on a generalization of the lumped-circuit calculation methods to the case of long transmission lines by the introduction of refinement functions. A worst-case model for the amplitude-frequency characteristics of currents in the transmission line is developed on the basis of the proposed technique. The model is intended for diagnostics (express analysis) of electromagnetic compatibility in complexes of radio and electronic equipment. Worst-case nature of the model is provided by construction of the envelope of the current's maxima (observed at resonances) for the high-frequency band. The validity of the model is checked by comparison with the results of numerical simulation of single wire above ground plane, twowire, coaxial, and triaxial transmission lines in a wide range of parameter values: the frequency is varied from 10 kHz to 8 GHz, the length of the line is from 20 cm to 5 m, height of the line above the ground surface is from 2 mm to 100 mm, the ratio of the load capacitance (inductance) to the line capacitance (inductance) is from 10-40 to 104. Straight and piecewise-straight lines (both parallel and non-parallel to the ground plane) are considered during the validation.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129765239","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256351
S. Cakir, O. Sen, S. Acak, M. Çetintaş
Conducted immunity tests are always performed by use of Coupling Decoupling Networks (CDN) in laboratories in accordance with the standard EN61000-4-6. However, it is not always possible to use CDNs because of some limitations. If the Equipment Under Test (EUT) has large dimensions or high currents, it is not possible to use CDNs during tests. As a consequence, alternative methods are required in industry. In this paper, we firstly investigated the multi-CDN method which facilitates use of CDNs also for high-current EUTs by splitting mains current into several pieces that one CDN can handle. We also investigated simple wire-windings instead of cumbersome injection clamps to be applied to thick cables or cables in narrow places as an alternative to standard laboratory methods.
{"title":"Alternative conducted immunity testing with multiple CDNs and wire winding","authors":"S. Cakir, O. Sen, S. Acak, M. Çetintaş","doi":"10.1109/ISEMC.2015.7256351","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256351","url":null,"abstract":"Conducted immunity tests are always performed by use of Coupling Decoupling Networks (CDN) in laboratories in accordance with the standard EN61000-4-6. However, it is not always possible to use CDNs because of some limitations. If the Equipment Under Test (EUT) has large dimensions or high currents, it is not possible to use CDNs during tests. As a consequence, alternative methods are required in industry. In this paper, we firstly investigated the multi-CDN method which facilitates use of CDNs also for high-current EUTs by splitting mains current into several pieces that one CDN can handle. We also investigated simple wire-windings instead of cumbersome injection clamps to be applied to thick cables or cables in narrow places as an alternative to standard laboratory methods.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134365850","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256129
Marco Brignone Aimonetto, F. Fiori
This paper discusses the pros and cons of the EMIRR, a parameter used to indicate the susceptibility of Operational Amplifiers to ElectroMagnetic Interference. Such a parameter is defined assuming a quadratic relationship between the interference amplitude and the EMI-induced offset. This work shows through analyses and experimental tests that such an assumption is valid only in particular cases, meaning that the application of the EMIRR is limited.
{"title":"On the effectiveness of EMIRR to qualify OpAmps","authors":"Marco Brignone Aimonetto, F. Fiori","doi":"10.1109/ISEMC.2015.7256129","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256129","url":null,"abstract":"This paper discusses the pros and cons of the EMIRR, a parameter used to indicate the susceptibility of Operational Amplifiers to ElectroMagnetic Interference. Such a parameter is defined assuming a quadratic relationship between the interference amplitude and the EMI-induced offset. This work shows through analyses and experimental tests that such an assumption is valid only in particular cases, meaning that the application of the EMIRR is limited.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133009670","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256131
Y. Yu, Cheng-Nan Chiu, Yih-Ping Chiou, Tzong-Lin Wu
A special surface wave only exists on a finite-size frequency-selective surface (FSS), arrayed in a sub-wavelength periodic element. This surface wave induced by external incidence may cause strong end-fired emission and highly degrade the performance of the FSS applied as electromagnetic shielding especially along the end-fired direction. A hybrid design method for such a finite-size FSS with electromagnetic bandgap (EBG) structure is first-time proposed to significantly suppress the end-fired emission. Specifically, this suppression can even up to 15 dB in our design. For demonstration, a finite-size FSS utilizing a new miniaturized element is provided. A prototype of the FSS is created, modeled and tested. It reveals good consistency among models, full-wave simulation, and measured results.
{"title":"Suppression of end-fired emission for a miniaturized-element frequency-selective shielding surface with finite size using EBG","authors":"Y. Yu, Cheng-Nan Chiu, Yih-Ping Chiou, Tzong-Lin Wu","doi":"10.1109/ISEMC.2015.7256131","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256131","url":null,"abstract":"A special surface wave only exists on a finite-size frequency-selective surface (FSS), arrayed in a sub-wavelength periodic element. This surface wave induced by external incidence may cause strong end-fired emission and highly degrade the performance of the FSS applied as electromagnetic shielding especially along the end-fired direction. A hybrid design method for such a finite-size FSS with electromagnetic bandgap (EBG) structure is first-time proposed to significantly suppress the end-fired emission. Specifically, this suppression can even up to 15 dB in our design. For demonstration, a finite-size FSS utilizing a new miniaturized element is provided. A prototype of the FSS is created, modeled and tested. It reveals good consistency among models, full-wave simulation, and measured results.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122016459","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256135
P. Angskog, M. Backstrom, B. Vallhagen
Glass windows have undergone an energy saving evolution over the past three, four decades, from single panes till today's ultralow-emission windows. While the earliest energy saving windows were constructed as a sandwich of clear glass panes using the vacuum-flask principle, modern low-emission windows includes panes with coatings of metal and/or metal oxides. This coating has caused radio propagation problems for communication systems; something that may be utilized to protect a building from intentional electromagnetic interference (IEMI) attacks and to help protecting against information leakage. In this paper measurements of the shielding performance of different generations of windows and qualities of window panes are presented. The intention is to include the results in a guide-line for IEMI protection of critical infrastructures. Measurements are made using two complementary methods; in a nested reverberation chamber and in a semi-anechoic chamber, both over the range 1 - 18 GHz. The results show a clear generation dependency where the energy saving windows largely do not attenuate RF signals at all and low-emission windows offer shielding effectiveness values between 10 and 45 dB with potentially as much as around 60 dB in the upper half of the spectrum.
{"title":"Measurement of radio signal propagation through window panes and energy saving windows","authors":"P. Angskog, M. Backstrom, B. Vallhagen","doi":"10.1109/ISEMC.2015.7256135","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256135","url":null,"abstract":"Glass windows have undergone an energy saving evolution over the past three, four decades, from single panes till today's ultralow-emission windows. While the earliest energy saving windows were constructed as a sandwich of clear glass panes using the vacuum-flask principle, modern low-emission windows includes panes with coatings of metal and/or metal oxides. This coating has caused radio propagation problems for communication systems; something that may be utilized to protect a building from intentional electromagnetic interference (IEMI) attacks and to help protecting against information leakage. In this paper measurements of the shielding performance of different generations of windows and qualities of window panes are presented. The intention is to include the results in a guide-line for IEMI protection of critical infrastructures. Measurements are made using two complementary methods; in a nested reverberation chamber and in a semi-anechoic chamber, both over the range 1 - 18 GHz. The results show a clear generation dependency where the energy saving windows largely do not attenuate RF signals at all and low-emission windows offer shielding effectiveness values between 10 and 45 dB with potentially as much as around 60 dB in the upper half of the spectrum.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124918932","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256286
G. Asmanis, D. Stepins, A. Ašmanis, L. Ribickis
This paper deals with modeling of mutual couplings between passive EMI filter components: inductors and capacitors positioned on printed circuit board. 3D electromagnetic software CST MWS is used for the modeling. Three scenarios are considered: mutual couplings between two capacitors, mutual couplings between two inductors and mutual couplings between inductor and capacitor. Modeling results are verified experimentally using a vector network analyzer. Comparison of the measurement and modeling results shows that transfer coefficients and mutual inductance between two capacitors can be predicted accurately. However modeling of the mutual couplings between two inductors has the lowest accuracy.
{"title":"Mutual couplings between EMI filter components","authors":"G. Asmanis, D. Stepins, A. Ašmanis, L. Ribickis","doi":"10.1109/ISEMC.2015.7256286","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256286","url":null,"abstract":"This paper deals with modeling of mutual couplings between passive EMI filter components: inductors and capacitors positioned on printed circuit board. 3D electromagnetic software CST MWS is used for the modeling. Three scenarios are considered: mutual couplings between two capacitors, mutual couplings between two inductors and mutual couplings between inductor and capacitor. Modeling results are verified experimentally using a vector network analyzer. Comparison of the measurement and modeling results shows that transfer coefficients and mutual inductance between two capacitors can be predicted accurately. However modeling of the mutual couplings between two inductors has the lowest accuracy.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124171390","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256327
V. M. Fedorov, V. Y. Ostashev, V. Tarakanov, A. V. Ul’yanov
Paper describes the results and problems around creation and diagnostics both the high power radiators and the E-field strip-line sensors of the directional wave coupler type. They were used in technique of short electromagnetic pulsed (EMP) waves with ultra-wideband (UWB) frequency spectrum (0.1 GHz -10 GHz) and high pulsed power. The E-field strip-line antenna sensors connected to digital oscilloscopes were used to measure the pulsed electromagnetic transverse (TEM) travelingwaves. The high power pulsed radiators were constructed with the UWB radiation antennas of a TEM-horn type and the pulsed high power semiconductor generators (“FID Technology” comp). It was made models of compact autonomous radiators with the generators for 10-100 kV pulsed voltages and 1-100 kHz repetition rate pulses with control synchronizing. New E-field sensor of non-symmetrical two-wire type has dielectric stalk with high ε=16 and small cross-section. Sensors were tested experimentally by using the compact line-cell with TEM waves. The test results were the 0.32 V/(kV/m) E-field sensitivity, 0.03 ns rise-time and up to 7 ns pulse duration without signal distortions. The results were in good accordance with the computer simulation by electromagnetic 3-D code “KARAT”. The EMP radiation with the E(t)-field amplitudes of levels 10 kV/m can be successfully used to examine various electronic devices on electromagnetic compatibility (EMC).
{"title":"High power radiators and E-field sensors for sub-nanosecond electromagnetic pulses","authors":"V. M. Fedorov, V. Y. Ostashev, V. Tarakanov, A. V. Ul’yanov","doi":"10.1109/ISEMC.2015.7256327","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256327","url":null,"abstract":"Paper describes the results and problems around creation and diagnostics both the high power radiators and the E-field strip-line sensors of the directional wave coupler type. They were used in technique of short electromagnetic pulsed (EMP) waves with ultra-wideband (UWB) frequency spectrum (0.1 GHz -10 GHz) and high pulsed power. The E-field strip-line antenna sensors connected to digital oscilloscopes were used to measure the pulsed electromagnetic transverse (TEM) travelingwaves. The high power pulsed radiators were constructed with the UWB radiation antennas of a TEM-horn type and the pulsed high power semiconductor generators (“FID Technology” comp). It was made models of compact autonomous radiators with the generators for 10-100 kV pulsed voltages and 1-100 kHz repetition rate pulses with control synchronizing. New E-field sensor of non-symmetrical two-wire type has dielectric stalk with high ε=16 and small cross-section. Sensors were tested experimentally by using the compact line-cell with TEM waves. The test results were the 0.32 V/(kV/m) E-field sensitivity, 0.03 ns rise-time and up to 7 ns pulse duration without signal distortions. The results were in good accordance with the computer simulation by electromagnetic 3-D code “KARAT”. The EMP radiation with the E(t)-field amplitudes of levels 10 kV/m can be successfully used to examine various electronic devices on electromagnetic compatibility (EMC).","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128850384","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256132
H. Schippers, J. Verpoorte
The shielding effectiveness of metal braids of cables is governed by the geometry and the materials of the braid. The shielding effectiveness can be characterised by the transfer impedance of the metal braid. Analytical models for the transfer impedance contain in general two components, one representing diffusion of electromagnetic energy through the metal braid, and a second part representing leakage of magnetic fields through the braid. The second part is a local phenomenon, which again has three parts: hole inductance, braid inductance and skin inductance. The hole inductance is governed by the penetration of magnetic fields through the apertures of the braid. Well-known analytical models overestimate the contribution of the hole inductance by a factor two. This can be easily corrected by multiplying the hole inductance terms by a factor (2/π)3/2.
{"title":"Hole inductance in braided cable shields","authors":"H. Schippers, J. Verpoorte","doi":"10.1109/ISEMC.2015.7256132","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256132","url":null,"abstract":"The shielding effectiveness of metal braids of cables is governed by the geometry and the materials of the braid. The shielding effectiveness can be characterised by the transfer impedance of the metal braid. Analytical models for the transfer impedance contain in general two components, one representing diffusion of electromagnetic energy through the metal braid, and a second part representing leakage of magnetic fields through the braid. The second part is a local phenomenon, which again has three parts: hole inductance, braid inductance and skin inductance. The hole inductance is governed by the penetration of magnetic fields through the apertures of the braid. Well-known analytical models overestimate the contribution of the hole inductance by a factor two. This can be easily corrected by multiplying the hole inductance terms by a factor (2/π)3/2.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121040918","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}
Pub Date : 2015-09-14DOI: 10.1109/ISEMC.2015.7256271
W. Mathis, R. Mathis
In general Maxwell's equations cannot be solved in an analytic manner but numerous methods for the approximation of these equations are available. On the other hand Maxwell's equations can be transformed into ordinary differential equations of the transmission line type under certain conditions. In this paper we will discuss such cases where the electromagnetic field can be calculated for the original geometry by means of generalized transmission line equations. Subsequently we will discuss whether these equations can be derived also if the boundary conditions are disturbed in an irregular manner.
{"title":"On the derivation of generalized transmission line equations of cylindrical waveguides with irregular deformed surfaces","authors":"W. Mathis, R. Mathis","doi":"10.1109/ISEMC.2015.7256271","DOIUrl":"https://doi.org/10.1109/ISEMC.2015.7256271","url":null,"abstract":"In general Maxwell's equations cannot be solved in an analytic manner but numerous methods for the approximation of these equations are available. On the other hand Maxwell's equations can be transformed into ordinary differential equations of the transmission line type under certain conditions. In this paper we will discuss such cases where the electromagnetic field can be calculated for the original geometry by means of generalized transmission line equations. Subsequently we will discuss whether these equations can be derived also if the boundary conditions are disturbed in an irregular manner.","PeriodicalId":412708,"journal":{"name":"2015 IEEE International Symposium on Electromagnetic Compatibility (EMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122430089","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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