The theoretical reception pattern characteristics of t he wave a ntenna at VLF, plus a n experimental study of the parameters that determine the patte rns, a rc prese nted. Wave antennas have optimum lengths xvhere t he fron t-to-back ratio is greatest. The first optimum length (highest front-to-back ratio for th e shor test length) is considered in t his pa per. The patterns of t he wave antenn a at t hese optimum lengths depend upon only two pa ra mete rs which can easily be measured at t he desired ante nn a location. These t wo parameter ' a rc t he a nten na loss a nd the wave velocity along t he antenna. When these two paramete rs a re known, the patterns of a ll first optimum le ngt h wave a ntenn as can be s ketc hed from t he curves in th is pa pe r.
{"title":"Optimum reception pattern of the Beverage wave antenna at very low frequencies","authors":"E. Seeley","doi":"10.6028/JRES.067D.044","DOIUrl":"https://doi.org/10.6028/JRES.067D.044","url":null,"abstract":"The theoretical reception pattern characteristics of t he wave a ntenna at VLF, plus a n experimental study of the parameters that determine the patte rns, a rc prese nted. Wave antennas have optimum lengths xvhere t he fron t-to-back ratio is greatest. The first optimum length (highest front-to-back ratio for th e shor test length) is considered in t his pa per. The patterns of t he wave antenn a at t hese optimum lengths depend upon only two pa ra mete rs which can easily be measured at t he desired ante nn a location. These t wo parameter ' a rc t he a nten na loss a nd the wave velocity along t he antenna. When these two paramete rs a re known, the patterns of a ll first optimum le ngt h wave a ntenn as can be s ketc hed from t he curves in th is pa pe r.","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131144472","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}
Abstract : The amplitude and phase are calculated for oblique propagation across a coastline with a sloping beach. In this case, the land and sea are taken to be plane surfaces and the beach slope is constant. It is shown that the reflected wave may be quite significant and it has a fundamentally different character from the reflected wave in the case of a flat-lying coastline. (Author)
{"title":"OBLIQUE PROPAGATION OF GROUNDWAVES ACROSS A COASTLINE-PART II,","authors":"J. Wait, C. Jackson","doi":"10.6028/JRES.067D.067","DOIUrl":"https://doi.org/10.6028/JRES.067D.067","url":null,"abstract":"Abstract : The amplitude and phase are calculated for oblique propagation across a coastline with a sloping beach. In this case, the land and sea are taken to be plane surfaces and the beach slope is constant. It is shown that the reflected wave may be quite significant and it has a fundamentally different character from the reflected wave in the case of a flat-lying coastline. (Author)","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"294 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123592197","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 stati stical th co ry of t hc behavio r of rays scattcrcd at succcssivc ionosphcric rcAcctions in propagatin g a round a spheri cal earth is givcn. Thc t hro ry prcdicts thc propcrt ic of the a ntipodal a rca, thc deviaLion of bcarin g to be expccted at placcs o r-r the main trans mi tti ng bCil ll1 and thc spI'cad of t hc in co min g fan of rays at a ll d i tanccs . Specia l propcrLi es a ppeal' to be associated with reception at an angul a r di stancc o f a bout 255 0 from t he t ra n mittel'. The eff ccts of a n a bsorbin g r cgion on t ilt' rccrivcd dircction a nd spread of m ys a rc di scusscd .
{"title":"Ionospheric scattering effects in long-distance propagation","authors":"H. Whale","doi":"10.6028/JRES.067D.032","DOIUrl":"https://doi.org/10.6028/JRES.067D.032","url":null,"abstract":"A stati stical th co ry of t hc behavio r of rays scattcrcd at succcssivc ionosphcric rcAcctions in propagatin g a round a spheri cal earth is givcn. Thc t hro ry prcdicts thc propcrt ic of the a ntipodal a rca, thc deviaLion of bcarin g to be expccted at placcs o r-r the main trans mi tti ng bCil ll1 and thc spI'cad of t hc in co min g fan of rays at a ll d i tanccs . Specia l propcrLi es a ppeal' to be associated with reception at an angul a r di stancc o f a bout 255 0 from t he t ra n mittel'. The eff ccts of a n a bsorbin g r cgion on t ilt' rccrivcd dircction a nd spread of m ys a rc di scusscd .","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127295576","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}
Graphs arc pro vided for t he normali zed impcdance of ce nte r-dri ven cylind rical dipole a nLe nnas when irnm_ersed in a ir or in a dissipaLive medium. The electric half-le ngth ranges from 1 to 100 for dipoles in a ir and from 1 to 19.7 for dipoles in a diss ipaLi ve medium. Three rat ios of r adius of the antenna to waveleng t h have been used. The proper t ies of the medium a re exp ressed in terms of the ratio 01 / f3 in the r a nge from zero to one where f3 a nd 01 are, respectively, t he real a nd imaginary parts of t he complex propagatio n cons tant k.
{"title":"Impedances of long antennas in air and in dissipative media","authors":"D. W. Gooch, C. Harrison, R. King, T. Wu","doi":"10.6028/JRES.067D.038","DOIUrl":"https://doi.org/10.6028/JRES.067D.038","url":null,"abstract":"Graphs arc pro vided for t he normali zed impcdance of ce nte r-dri ven cylind rical dipole a nLe nnas when irnm_ersed in a ir or in a dissipaLive medium. The electric half-le ngth ranges from 1 to 100 for dipoles in a ir and from 1 to 19.7 for dipoles in a diss ipaLi ve medium. Three rat ios of r adius of the antenna to waveleng t h have been used. The proper t ies of the medium a re exp ressed in terms of the ratio 01 / f3 in the r a nge from zero to one where f3 a nd 01 are, respectively, t he real a nd imaginary parts of t he complex propagatio n cons tant k.","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"612 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131728710","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":"Effects of radio wave propagation through mid-latitude 6300 A auroral arcs","authors":"J. R. Roach","doi":"10.6028/JRES.067D.030","DOIUrl":"https://doi.org/10.6028/JRES.067D.030","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125278375","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":"Concerning solutions of the VLF mode problem for an anisotropic curved ionosphere","authors":"J. Wait","doi":"10.6028/JRES.067D.033","DOIUrl":"https://doi.org/10.6028/JRES.067D.033","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117347947","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":"On the statistical theory of electromagnetic waves in a fluctuating medium (I)","authors":"K. Furutsu","doi":"10.6028/JRES.067D.034","DOIUrl":"https://doi.org/10.6028/JRES.067D.034","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125845487","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 radiation from a radial electric dipole on t he surfacc of a corru gatcd sphcrc is treated . It is shown t hat t he power ra di ated in a given mode depends crit ically on t he surface reactance a nd t he circumference of t he sphere. In fac t, for certain values of t hese pa rameters, particular modes a re strongly excited and contain most of t he powcr . Such a structure can be regarded as a n extern al reso nator an d its resonan t characte ri stics are a function of the refractive index of th e surroundin g medium. This opcns t he possibility t hat a surface-wave spherical reso nator m ay have important appli cations to refmcto llwtry.
{"title":"Resonant characteristics of a corrugated sphere","authors":"J. Wait, C. Jackson","doi":"10.6028/JRES.067D.037","DOIUrl":"https://doi.org/10.6028/JRES.067D.037","url":null,"abstract":"The radiation from a radial electric dipole on t he surfacc of a corru gatcd sphcrc is treated . It is shown t hat t he power ra di ated in a given mode depends crit ically on t he surface reactance a nd t he circumference of t he sphere. In fac t, for certain values of t hese pa rameters, particular modes a re strongly excited and contain most of t he powcr . Such a structure can be regarded as a n extern al reso nator an d its resonan t characte ri stics are a function of the refractive index of th e surroundin g medium. This opcns t he possibility t hat a surface-wave spherical reso nator m ay have important appli cations to refmcto llwtry.","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121343624","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}
Abstract : An experimental investigation is described on the influence of ground inhomogeneities on the reception of skywave signals, especially the influence of the conductivity contrast near a coastline. This gives rise to a rapid decrease in field-strength near the coastline as is well known from groundwave mixed-path theory. Comparison with theory is given. Influence of diffuse reflection from the ionosphere is also considered.
{"title":"RECEPTION OF SKYWAVE SIGNALS NEAR A COASTLINE","authors":"J. Andersen","doi":"10.6028/JRES.067D.035","DOIUrl":"https://doi.org/10.6028/JRES.067D.035","url":null,"abstract":"Abstract : An experimental investigation is described on the influence of ground inhomogeneities on the reception of skywave signals, especially the influence of the conductivity contrast near a coastline. This gives rise to a rapid decrease in field-strength near the coastline as is well known from groundwave mixed-path theory. Comparison with theory is given. Influence of diffuse reflection from the ionosphere is also considered.","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114009287","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":"ANALYSIS AND SYNTHESIS OF NONUNIFORM TRANSMISSION LINES OR STRATIFIED LAYERS","authors":"G. Latmiral, G. Franceschetti, R. Vinciguerra","doi":"10.6028/JRES.067D.036","DOIUrl":"https://doi.org/10.6028/JRES.067D.036","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"229 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116437160","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：