Post-processing Techniques in Antenna Measurement
- Length: 312 pages
- Edition: 1
- Language: English
- Publisher: SciTech Publishing
- Publication Date: 2019-11-01
- ISBN-10: 1785615378
- ISBN-13: 9781785615375
- Sales Rank: #3514590 (See Top 100 Books)
This book summarises recent developments and enhancements in post-processing techniques that increase the quality and effectiveness of modern antenna measurements. Recent advances in near to far field transformation algorithms for enhancing measurement accuracy in the presence of different common error sources are explained in detail. Developments in techniques for reducing the effect of echoes, noise, and leakage, and to reduce acquisition time, are also explored.
The book is written by a range of experts from academia and industry. It explains and illustrates by practical examples several very efficient source reconstruction techniques, and the use of modal and spatial filtering techniques to understand intimate features of measured antennas. It explains phase recovery techniques and demonstrates how combining simulations and measurements can allow for more accurate and faster antenna designs. The book is a useful resource for academics and industry professionals interested in both antenna measurement and design.
Cover Title Copyright Contents About the editors 1 Introduction to antenna measurement and post-processing techniques References 2 Source reconstruction using equivalent currents 2.1 Introduction 2.2 Formulation of the source reconstruction problem 2.2.1 Application of the equivalence theorem 2.2.2 Uniqueness of the solution to the reconstruction problem 2.3 Numerical solution of the source reconstruction problem 2.3.1 Discretization 2.3.2 Setup of the linear system 2.3.3 Application of existing Method of Moments codes in source reconstruction 2.4 Probe correction 2.4.1 Reciprocity and the reception formula 2.4.2 Formulation of the source reconstruction problem with probe correction 2.5 Application examples 2.5.1 Application as an investigation and diagnostic tool 2.5.2 Application in field transformations 2.5.3 Array antenna synthesis 2.6 Numerical tests on the accuracy of source reconstruction 2.7 Conclusions and outlook References 3 Antenna and measurement improvements based on equivalent currents reconstruction 3.1 Introduction 3.2 Application of EQC in the improvement of antenna system design 3.2.1 Advanced diagnostic of a wideband dual-ridge horn 3.2.2 Design improvement of an X-band 32 × 8 array 3.2.3 Verification of complex excitation coefficient of a space array antenna 3.2.4 Analysis of coupling phenomena between spacecraft antennas 3.2.5 Investigation of spherical higher order modes in the design of NF probes 3.3 Application of EQC in the improvement of antenna measurements accuracy 3.3.1 Diagnostic and spatial filtering of supporting structure 3.3.2 Echo suppression 3.3.3 Reduction of truncation errors 3.4 Further applications of the EQC technique 3.4.1 Power density determination of measured devices 3.4.2 Application of the EQC technique in EMC testing 3.5 Conclusions and discussion on advantages and limitations of the EQC technique References 4 Holographic techniques to improve antenna measurements 4.1 Use of holographic techniques for reducing errors in antenna measurements 4.1.1 Potential of source reconstruction techniques 4.1.2 Noise 4.1.3 Reflections 4.1.4 Measurement scan truncation 4.1.5 Leakage 4.2 Theory of holographic techniques in electromagnetics 4.3 Noise reduction using holographic techniques 4.4 Echo reduction using holographic techniques 4.5 Extrapolation of the radiation pattern and reduction of truncation errors 4.6 Detection and suppression of leakage 4.7 Conclusions References 5 Antenna measurement improvement using spherical or cylindrical mode expansion 5.1 Improvements of antenna measurement accuracy using spherical mode expansion 5.1.1 Spherical wave expansion theory 5.1.2 SWE as spatial filter 5.2 Exploiting cylindrical mode expansion for fast single-cut measurements with improved accuracy 5.2.1 Theory of cylindrical waves 5.2.2 Single-cut measurements 5.2.3 Applications to echo reduction in single-cut measurements 5.3 Conclusions References 6 Phase recovery in antenna measurements 6.1 Introduction 6.1.1 Main phase recovery techniques 6.1.2 Interferometric techniques 6.1.3 Iterative techniques 6.2 Indirect off-axis holography 6.2.1 Method 6.2.2 Improved schemes 6.2.3 Broadband indirect off-axis holography 6.2.4 Error analysis 6.3 Iterative phase retrieval techniques 6.3.1 Fundamentals 6.3.2 Phaseless sources reconstruction method 6.4 Conclusions References 7 Link between simulation and measurements 7.1 Introduction 7.2 Theory 7.2.1 Domain decomposition technique 7.2.2 Black box representation of devices radiating into 3D space 7.2.3 Definition of The Link 7.2.4 Validation of The Link 7.3 Antenna in free space 7.4 Mounted antennas 7.4.1 Reflector fed by a horn antenna 7.4.2 Flush-mounted antenna on a flat structure 7.5 Practical application of The Link 7.5.1 Test object and complex scenario 7.5.2 Validation workflow 7.5.3 Results 7.6 Conclusions References 8 Future trends in antenna measurements 8.1 Summary of the analysed post-processing techniques 8.2 From passive to digital antenna technologies 8.3 Performance parameters for digital antennas 8.4 Antenna measurement systems for digital antennas 8.5 Outlook for the new developments in antenna measurement systems 8.6 Conclusions References Index
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