Pub Date : 1989-10-29DOI: 10.1109/CEIDP.1989.69530
Ren Peiyu, Zhong Guangming
An approach is developed which can be used to calculate the sparking and residual voltages V/sub s/ and V/sub r/, or the ratio between them, from the corner values V/sub p/ and V/sub q/ in a parallelogram. From a theoretical analysis of the parallelogram method, which is used for partial-discharge measurement, the width of the parallelogram is equal to the sum of the partial discharge inception voltage plus the voltage that equals the residual voltage of a void multiplied by a factor of 1+C/sub c//C/sub b/. If the sparking voltage is approximately equal to the residual voltage, the width of the parallelogram is approximately equal to the partial-discharge inception voltage multiplied by 2 square root 2. V/sub s/ and V/sub r/, or V/sub r//V/sub s/, can also be calculated from the corner parameters of parallelograms.<>
{"title":"Determination of sparking voltage and residual voltage of a void included in an electrical insulation system","authors":"Ren Peiyu, Zhong Guangming","doi":"10.1109/CEIDP.1989.69530","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69530","url":null,"abstract":"An approach is developed which can be used to calculate the sparking and residual voltages V/sub s/ and V/sub r/, or the ratio between them, from the corner values V/sub p/ and V/sub q/ in a parallelogram. From a theoretical analysis of the parallelogram method, which is used for partial-discharge measurement, the width of the parallelogram is equal to the sum of the partial discharge inception voltage plus the voltage that equals the residual voltage of a void multiplied by a factor of 1+C/sub c//C/sub b/. If the sparking voltage is approximately equal to the residual voltage, the width of the parallelogram is approximately equal to the partial-discharge inception voltage multiplied by 2 square root 2. V/sub s/ and V/sub r/, or V/sub r//V/sub s/, can also be calculated from the corner parameters of parallelograms.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"144 1","pages":"99-104"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72846407","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69528
M. Pace, A. Wintenberg, T. V. Blalock, E. Kelley, G. FitzPatrick, C. Fenimore, H. Yamashita
The pressure dependence of partial discharges (PD) has been experimentally investigated at a needle electrode in hexane from subatmospheric pressure (near hexane vapor pressure) to several atmospheres. Each PD produces a phase transition in the liquid near the needle, which is photographed in synchronism with a characteristic pattern of current pulses. An image-preserving optical delay allows photography to commence just before or at inception of the discharge. Individual current pulses comprising a characteristic pattern are resolved. The cathode event consists of a short pressure-insensitive inception phase, a pressure-sensitive growth at a decreasing rate, and finally a detachment and dissipation, sometimes with noticeable contraction before detachment; increased pressure reduces the growth rate and lifetime. The accompanying characteristic current pulse pattern always ceases during the growth of the PD. For the anode event, less extensive data similarly show slowing of growth with increased pressure and a (different) characteristic current pulse pattern.<>
{"title":"Pressure effects on partial discharges in hexane under DC voltage","authors":"M. Pace, A. Wintenberg, T. V. Blalock, E. Kelley, G. FitzPatrick, C. Fenimore, H. Yamashita","doi":"10.1109/CEIDP.1989.69528","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69528","url":null,"abstract":"The pressure dependence of partial discharges (PD) has been experimentally investigated at a needle electrode in hexane from subatmospheric pressure (near hexane vapor pressure) to several atmospheres. Each PD produces a phase transition in the liquid near the needle, which is photographed in synchronism with a characteristic pattern of current pulses. An image-preserving optical delay allows photography to commence just before or at inception of the discharge. Individual current pulses comprising a characteristic pattern are resolved. The cathode event consists of a short pressure-insensitive inception phase, a pressure-sensitive growth at a decreasing rate, and finally a detachment and dissipation, sometimes with noticeable contraction before detachment; increased pressure reduces the growth rate and lifetime. The accompanying characteristic current pulse pattern always ceases during the growth of the PD. For the anode event, less extensive data similarly show slowing of growth with increased pressure and a (different) characteristic current pulse pattern.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"222 1","pages":"87-92"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75040868","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69553
G. Gagnon, S. Pélissou, M. Wertheimer
It has been shown in a previous study (P. Rohl, 1982) that the breakdown strength of polyethylene increases with increasing oxidation levels. The purpose of the research reported here is to verify this somewhat surprising result. Unlike the earlier work, cross-linked polyethylene (XLPE), the principal insulation used in extruded cables, is utilized. The authors correlate dielectric breakdown measurements with oxidation, monitored by Fourier transform infrared (FTIR) spectroscopy, and the results are interpreted using the modified free-volume theory. It is found that the breakdown strength E/sub b/ indeed shows a slight tendency to increase with the oxidation level. In particular, the authors found a correlation between E/sub b/ and the degree of oxidation, expressed in terms of the carbonyl band (1741 cm/sup -1/) absorption. The exact reasons for this behavior are not clear at this time, but appear to be compatible with the modified free-volume theory breakdown.<>
{"title":"Oxidation dependence of breakdown strength of XLPE","authors":"G. Gagnon, S. Pélissou, M. Wertheimer","doi":"10.1109/CEIDP.1989.69553","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69553","url":null,"abstract":"It has been shown in a previous study (P. Rohl, 1982) that the breakdown strength of polyethylene increases with increasing oxidation levels. The purpose of the research reported here is to verify this somewhat surprising result. Unlike the earlier work, cross-linked polyethylene (XLPE), the principal insulation used in extruded cables, is utilized. The authors correlate dielectric breakdown measurements with oxidation, monitored by Fourier transform infrared (FTIR) spectroscopy, and the results are interpreted using the modified free-volume theory. It is found that the breakdown strength E/sub b/ indeed shows a slight tendency to increase with the oxidation level. In particular, the authors found a correlation between E/sub b/ and the degree of oxidation, expressed in terms of the carbonyl band (1741 cm/sup -1/) absorption. The exact reasons for this behavior are not clear at this time, but appear to be compatible with the modified free-volume theory breakdown.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"118 1","pages":"241-246"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77584904","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69573
D.H. Ren, A. Watson
It has been shown that, compared with dimethyl siloxane, transformer oil has similar reproducible current characteristics as a function of ramped voltage applied up to a high prebreakdown electric stress, where it obeys the equation I varies as V/sup s/. Moreover, at a very high electric stress, the displacement current component apparently reverses, which was not previously observed in silicone oil. This abnormal phenomenon is very dependent upon the conditions. From an earlier study in silicone oil, the average current response to the rising and falling voltage appears on a log-log scale with two linear portions which are sharply divided. Transformer oil has similar characteristics under similar testing conditions, but with increasing voltage amplitude of the applied ramp the slopes of the linear portions are changed. These two lines may become one if the maximum voltage and ramp rate are very high. This is true for copper and aluminum electrodes at differing gap separations.<>
{"title":"Ramped voltage testing of transformer oil","authors":"D.H. Ren, A. Watson","doi":"10.1109/CEIDP.1989.69573","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69573","url":null,"abstract":"It has been shown that, compared with dimethyl siloxane, transformer oil has similar reproducible current characteristics as a function of ramped voltage applied up to a high prebreakdown electric stress, where it obeys the equation I varies as V/sup s/. Moreover, at a very high electric stress, the displacement current component apparently reverses, which was not previously observed in silicone oil. This abnormal phenomenon is very dependent upon the conditions. From an earlier study in silicone oil, the average current response to the rising and falling voltage appears on a log-log scale with two linear portions which are sharply divided. Transformer oil has similar characteristics under similar testing conditions, but with increasing voltage amplitude of the applied ramp the slopes of the linear portions are changed. These two lines may become one if the maximum voltage and ramp rate are very high. This is true for copper and aluminum electrodes at differing gap separations.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"54 1","pages":"363-368"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74178775","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69551
C. Chauvet, C. Laurent, C. Mayoux
In order to investigate the consequences of water-induced degradation on the dielectric breakdown field of polyethylene, the authors performed statistical electric breakdown strength measurements on cable slices previously aged in the presence of water. A Weibull analysis is performed on at least 40 sets of breakdown voltage data for each population, leading to a precise determination of the nominal breakdown field E/sub 0/. Comparison is made as a function of ageing time and testing conditions. Wet ageing under conditions of water tree development affects the breakdown strength of XLPE (cross-linked polyethylene) cable slices. The presence of water trees in the insulation must therefore be considered as potentially harmful.<>
{"title":"Influence of wet ageing on the electrical breakdown strength of XLPE cable slices","authors":"C. Chauvet, C. Laurent, C. Mayoux","doi":"10.1109/CEIDP.1989.69551","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69551","url":null,"abstract":"In order to investigate the consequences of water-induced degradation on the dielectric breakdown field of polyethylene, the authors performed statistical electric breakdown strength measurements on cable slices previously aged in the presence of water. A Weibull analysis is performed on at least 40 sets of breakdown voltage data for each population, leading to a precise determination of the nominal breakdown field E/sub 0/. Comparison is made as a function of ageing time and testing conditions. Wet ageing under conditions of water tree development affects the breakdown strength of XLPE (cross-linked polyethylene) cable slices. The presence of water trees in the insulation must therefore be considered as potentially harmful.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"100 1","pages":"230-234"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85697073","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69549
H.M. Banford, R. Fouracre, G. Chen, D.J. Tedford
Transient pulses or spikes of current under direct applied fields have been observed in LDPE (low-density polyethylene) following gamma irradiation in ambient air and nitrogen and reactor irradiation in air to doses between 10/sup 4/ and 10/sup 6/ Gy. This pulse activity is a function of field strength, dose, and temperature, and it is also evidently a function of the environment in which the irradiations were carried out and the type of radiation. While the production of gas and/or microvoids within the material may make a contribution to such pulse activity, it is suggested that the dominant mechanism is a field-assisted thermal detrapping process. The greater pulse activity observed with test specimens gamma-irradiated in air compared to those irradiated in nitrogen is associated with the greater abundance of trapping centers in the air samples. These derive from changes in the polymer structure due to the oxidation which took place during irradiation. A similar argument is suggested to hold for reactor versus gamma irradiations in air.<>
{"title":"Current pulse activity in irradiated low-density polyethylene","authors":"H.M. Banford, R. Fouracre, G. Chen, D.J. Tedford","doi":"10.1109/CEIDP.1989.69549","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69549","url":null,"abstract":"Transient pulses or spikes of current under direct applied fields have been observed in LDPE (low-density polyethylene) following gamma irradiation in ambient air and nitrogen and reactor irradiation in air to doses between 10/sup 4/ and 10/sup 6/ Gy. This pulse activity is a function of field strength, dose, and temperature, and it is also evidently a function of the environment in which the irradiations were carried out and the type of radiation. While the production of gas and/or microvoids within the material may make a contribution to such pulse activity, it is suggested that the dominant mechanism is a field-assisted thermal detrapping process. The greater pulse activity observed with test specimens gamma-irradiated in air compared to those irradiated in nitrogen is associated with the greater abundance of trapping centers in the air samples. These derive from changes in the polymer structure due to the oxidation which took place during irradiation. A similar argument is suggested to hold for reactor versus gamma irradiations in air.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"22 1","pages":"218-223"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91024570","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69590
Y. Shao, K. Sheu, D. Damon, S. Huang, J.F. Johnson
The breakdown field strength of recessed samples of XLPE (cross-linked polyethylene) containing varying amounts of acetophenone and cumene is shown to decrease with increasing sample thickness. This thickness dependence is more complicated than previously observed. The addition of small amounts of acetophenone to XLPE produces a small increase in the dielectric strength. Small concentrations of cumene have no effect. Results from both AC ramp to failure and impulse breakdown can be fit to Weibull distributions. The characteristic values obtained from ramp to failure measurements depend on the ramp rate as suggested by theory.<>
{"title":"Dielectric strength of crosslinked polyethylene: the effects of the volatile products of the crosslinking reaction","authors":"Y. Shao, K. Sheu, D. Damon, S. Huang, J.F. Johnson","doi":"10.1109/CEIDP.1989.69590","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69590","url":null,"abstract":"The breakdown field strength of recessed samples of XLPE (cross-linked polyethylene) containing varying amounts of acetophenone and cumene is shown to decrease with increasing sample thickness. This thickness dependence is more complicated than previously observed. The addition of small amounts of acetophenone to XLPE produces a small increase in the dielectric strength. Small concentrations of cumene have no effect. Results from both AC ramp to failure and impulse breakdown can be fit to Weibull distributions. The characteristic values obtained from ramp to failure measurements depend on the ramp rate as suggested by theory.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"3 1","pages":"465-470"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87629031","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69580
A. Kumar
The absorption of microwaves in a composite containing a random distribution of iron-oxide particles embedded in fiberglass composites is considered. Generally, iron-oxide particles in the form of spheres or cylinders are held together by a binder such as fiberglass. Since weight and structural integrity of the composite are also of concern in many applications, it is desirable to choose the optimum volume fraction of iron-oxide particles and adjust the shape, size, and distribution of particles to obtain the required mass density and microwave absorbing properties. A short review of mixture theories is given. Results are shown for spherical conducting particles in a pure dielectric host medium and are compared with experimental data. Results (real and imaginary parts of the permittivity and permeability, loss tangent, reflection coefficient, and attenuation per unit length) on iron-oxide impregnated fiberglass composites in the frequency range of 1 to 12 GHz are reported.<>
{"title":"Ferrite-impregnated fibre-glass composites as microwave absorbers","authors":"A. Kumar","doi":"10.1109/CEIDP.1989.69580","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69580","url":null,"abstract":"The absorption of microwaves in a composite containing a random distribution of iron-oxide particles embedded in fiberglass composites is considered. Generally, iron-oxide particles in the form of spheres or cylinders are held together by a binder such as fiberglass. Since weight and structural integrity of the composite are also of concern in many applications, it is desirable to choose the optimum volume fraction of iron-oxide particles and adjust the shape, size, and distribution of particles to obtain the required mass density and microwave absorbing properties. A short review of mixture theories is given. Results are shown for spherical conducting particles in a pure dielectric host medium and are compared with experimental data. Results (real and imaginary parts of the permittivity and permeability, loss tangent, reflection coefficient, and attenuation per unit length) on iron-oxide impregnated fiberglass composites in the frequency range of 1 to 12 GHz are reported.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"1 1","pages":"403-408"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82307250","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69579
S.L. Wang
The definition of capacitance in ASTM D150-81 is improved by considering the definition of complex capacitance. It is concluded that since the practical capacitor always has losses, it can be suitably represented by complex capacitance. The complex capacitance is closely related to relative complex permittivity, so that the concept of complex capacitance is very important in technology, and an accurate definition of complex capacitance is necessary for electrical engineering.<>
{"title":"Comments on the definition of AC capacitance in ASTM-D150-81","authors":"S.L. Wang","doi":"10.1109/CEIDP.1989.69579","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69579","url":null,"abstract":"The definition of capacitance in ASTM D150-81 is improved by considering the definition of complex capacitance. It is concluded that since the practical capacitor always has losses, it can be suitably represented by complex capacitance. The complex capacitance is closely related to relative complex permittivity, so that the concept of complex capacitance is very important in technology, and an accurate definition of complex capacitance is necessary for electrical engineering.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"20 1","pages":"398-402"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75277156","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 : 1989-10-29DOI: 10.1109/CEIDP.1989.69545
A. Kumar
The effect of nuclear radiation in space on dielectric material used in microstrip and dielectric antennas is described. It has been shown that the primary effect of nuclear radiation on materials based on PTFE (polytetrafluoroethylene) is the reduction of molecular weight by breaking the large polymer molecule into smaller parts. There is an increase in brittleness, and this reaction is maximized in the presence of air. The degree to which PTFE is affected is essentially a function of the amount of energy absorbed regardless of the nature of the radiation. The susceptibility of electronic dielectric materials as a function of the total nuclear radiation dose is shown. Usually, the dose rate of 10 rad/h is quoted for the Van Allen belt. At this rate PTFE could operate for more than five years before a threshold level of damage would be detectable electrically and mechanically. Space-proven dielectric antennas are briefly discussed, with particular emphasis on the GTE GSTAR satellite reflector antenna which is fed by a dielectric loaded horn array. The elongation loss caused by radiation on a number of polyimide materials is shown.<>
{"title":"Effect of nuclear radiation on microstrip and dielectric antennas in space","authors":"A. Kumar","doi":"10.1109/CEIDP.1989.69545","DOIUrl":"https://doi.org/10.1109/CEIDP.1989.69545","url":null,"abstract":"The effect of nuclear radiation in space on dielectric material used in microstrip and dielectric antennas is described. It has been shown that the primary effect of nuclear radiation on materials based on PTFE (polytetrafluoroethylene) is the reduction of molecular weight by breaking the large polymer molecule into smaller parts. There is an increase in brittleness, and this reaction is maximized in the presence of air. The degree to which PTFE is affected is essentially a function of the amount of energy absorbed regardless of the nature of the radiation. The susceptibility of electronic dielectric materials as a function of the total nuclear radiation dose is shown. Usually, the dose rate of 10 rad/h is quoted for the Van Allen belt. At this rate PTFE could operate for more than five years before a threshold level of damage would be detectable electrically and mechanically. Space-proven dielectric antennas are briefly discussed, with particular emphasis on the GTE GSTAR satellite reflector antenna which is fed by a dielectric loaded horn array. The elongation loss caused by radiation on a number of polyimide materials is shown.<<ETX>>","PeriodicalId":10719,"journal":{"name":"Conference on Electrical Insulation and Dielectric Phenomena,","volume":"19 1","pages":"192-197"},"PeriodicalIF":0.0,"publicationDate":"1989-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75802782","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：