Pub Date : 2020-11-15DOI: 10.1049/sbra538g_appendixa
{"title":"Appendix A","authors":"","doi":"10.1049/sbra538g_appendixa","DOIUrl":"https://doi.org/10.1049/sbra538g_appendixa","url":null,"abstract":"","PeriodicalId":212731,"journal":{"name":"Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126886589","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":"Back Matter","authors":"","doi":"10.1049/sbra538g_bm","DOIUrl":"https://doi.org/10.1049/sbra538g_bm","url":null,"abstract":"","PeriodicalId":212731,"journal":{"name":"Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131501519","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":"Advanced antenna measurement topics","authors":"C. Parini, S. Gregson, J. McCormick, D. Rensburg","doi":"10.1049/PBEW055E_CH10","DOIUrl":"https://doi.org/10.1049/PBEW055E_CH10","url":null,"abstract":"This chapter encompasses a number of disparate antenna measurement topics: open-ended rectangular waveguide probes; dual polarised waveguide probes; broadband probes; far-field anechoic chamber measurements; probe calibration; channel balance correction for measurements of linearly and circularly polarised antennas; aperture diagnostics; amplitude and phase drift correction; antenna pattern rotation; alignment correction in planar antenna measurements; antenna pattern correction; near-field antenna measurements; planar and cylindrical mathematical absorber reflection suppression; spherical near-field electrical alignment; and three antenna gain method.","PeriodicalId":212731,"journal":{"name":"Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129880569","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}
From the material presented here, it is clear that the theory underlying the SNF approach is complex and involved to implement. However, it is also very elegant and provides one with many measurement options and powerful capabilities. The numerical implementation of the theory can be efficiently deployed through the use of the fast Fourier transform (FFT) enabling transforms of even electrically large antennas to be accomplished in a matter of a few seconds on a modern powerful digital computer. With the advent of commercially available SNF test systems, the user can exploit these techniques, largely unimpeded by the burden of the theory or the implementation thereof. The material presented here highlighted some of the fundamental concepts and limitations the user needs to be aware of in order to use these test systems with confidence.
{"title":"Spherical near-field antenna measurements","authors":"C. Parini, S. Gregson, J. McCormick, D. Rensburg","doi":"10.1049/PBEW055E_CH7","DOIUrl":"https://doi.org/10.1049/PBEW055E_CH7","url":null,"abstract":"From the material presented here, it is clear that the theory underlying the SNF approach is complex and involved to implement. However, it is also very elegant and provides one with many measurement options and powerful capabilities. The numerical implementation of the theory can be efficiently deployed through the use of the fast Fourier transform (FFT) enabling transforms of even electrically large antennas to be accomplished in a matter of a few seconds on a modern powerful digital computer. With the advent of commercially available SNF test systems, the user can exploit these techniques, largely unimpeded by the burden of the theory or the implementation thereof. The material presented here highlighted some of the fundamental concepts and limitations the user needs to be aware of in order to use these test systems with confidence.","PeriodicalId":212731,"journal":{"name":"Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122672231","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 uncertainty concepts described in this chapter form the basis of any range assessment (RA), regardless of the type of test facility and therefore allow us to create a framework within which the quality of any antenna measurement result can be expressed. It also allows us to do meaningful range inter-comparisons that have become such an integral part of modern test programmes. Although most of the groundwork related to RAs was conducted in an effort to validate near-field testing in the early days, this work has found wider application and can today be applied to far-field and CATR test systems with equal success. It is safe to say that the antenna measurement community (for the most part) have adopted the principle that measurement results need to be reported with an associated uncertainty, to make them credible.Finally, a very welcome side effect of doing any RA is a greater understanding of the measurement process and associated weaknesses. This often leads to a clear definition of exactly what aspect needs to be addressed if uncertainty is to be reduced, making for a very efficient use of resources in the process.
{"title":"Near-field range assessment","authors":"C. Parini, S. Gregson, J. McCormick, D. Rensburg","doi":"10.1049/PBEW055E_ch8","DOIUrl":"https://doi.org/10.1049/PBEW055E_ch8","url":null,"abstract":"The uncertainty concepts described in this chapter form the basis of any range assessment (RA), regardless of the type of test facility and therefore allow us to create a framework within which the quality of any antenna measurement result can be expressed. It also allows us to do meaningful range inter-comparisons that have become such an integral part of modern test programmes. Although most of the groundwork related to RAs was conducted in an effort to validate near-field testing in the early days, this work has found wider application and can today be applied to far-field and CATR test systems with equal success. It is safe to say that the antenna measurement community (for the most part) have adopted the principle that measurement results need to be reported with an associated uncertainty, to make them credible.Finally, a very welcome side effect of doing any RA is a greater understanding of the measurement process and associated weaknesses. This often leads to a clear definition of exactly what aspect needs to be addressed if uncertainty is to be reduced, making for a very efficient use of resources in the process.","PeriodicalId":212731,"journal":{"name":"Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132954493","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}
In this chapter we look at the key issues that are unique to the measurement of this class of antenna, and we start by considering both far-field and near-field techniques for radiation pattern measurement. We then consider the measurement of return loss and hence the antennas' operating bandwidth. In the practical use of mobile devices, there are no RF cables connecting them, but for S-parameter and pattern measurements a cable usually exists and it can have significant influence on the resulting measurements, and in section 9.5 we show how the use of optical fibre connections is solving this problem. The human body has a high dielectric constant and so antennas mounted close to the body operate differently than in 'free space', so in section 9.6 we consider the issue of 'on-body' antenna measurements both on a live subject and on the use of phantoms. For electrically small antennas efficiency is very important and in section 9.7 we consider the measurement of efficiency via both radiation pattern measurement and the Wheeler Cap method, where we report an improved method well suited to body-centric measurements. Finally we consider the measurement of UWB antennas, noting that 'radiation pattern' has less importance than pulse fidelity in many UWB applications.
{"title":"Mobile and body-centric antenna measurements","authors":"C. Parini, S. Gregson, J. McCormick, D. Rensburg","doi":"10.1049/PBEW055E_ch9","DOIUrl":"https://doi.org/10.1049/PBEW055E_ch9","url":null,"abstract":"In this chapter we look at the key issues that are unique to the measurement of this class of antenna, and we start by considering both far-field and near-field techniques for radiation pattern measurement. We then consider the measurement of return loss and hence the antennas' operating bandwidth. In the practical use of mobile devices, there are no RF cables connecting them, but for S-parameter and pattern measurements a cable usually exists and it can have significant influence on the resulting measurements, and in section 9.5 we show how the use of optical fibre connections is solving this problem. The human body has a high dielectric constant and so antennas mounted close to the body operate differently than in 'free space', so in section 9.6 we consider the issue of 'on-body' antenna measurements both on a live subject and on the use of phantoms. For electrically small antennas efficiency is very important and in section 9.7 we consider the measurement of efficiency via both radiation pattern measurement and the Wheeler Cap method, where we report an improved method well suited to body-centric measurements. Finally we consider the measurement of UWB antennas, noting that 'radiation pattern' has less importance than pulse fidelity in many UWB applications.","PeriodicalId":212731,"journal":{"name":"Theory and Practice of Modern Antenna Range Measurements, 2nd Expanded Edition, Volume 2","volume":"39 31","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113933955","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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