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Microwave Research and Teaching at Northumbria University

Learn about microwave research and teaching facilities, including details on microwave holography and its applications in antenna testing, security imaging, and medical imaging.

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Microwave Research and Teaching at Northumbria University

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  1. Microwave Teaching and Research at Northumbria University Prof. David Smith School of Computing, Engineering and Information Technology

  2. Outline of Presentation • How do microwaves fit in • Facilities within School • Microwave Research Outline • Details on Microwave Holography • Results of Microwave Holography

  3. How do Microwaves fit in ? • Undergraduate courses • B. Eng. Hons. CE 1 20 Point unit final yr, • 40 Point final yr individual project • B. Sc Hons. MCT 1 20 Point unit final yr • Post Graduate Taught Courses • M. Sc Opto and Comms 1 10 Point unit • 80 Point individual project • Research Students • 5 Ph. D. Full Time Students

  4. New Facilities within School • Agilent sponsored Microwave Research Laboratory • Agilent sponsored Microwave Teaching Laboratory • Agilent sponsored Opto and RF Research Laboratory

  5. Microwave Research / Teaching Facilities • Hardware – Major Items • Vector Analysis • PNA to 50 GHz, PNA to 40 GHz, Old VNA • NSI Near Field Antenna Measurement System • Spectrum Analysis, to 26.5 GHz • Synthesised sources, 50 GHz, 40 GHz, 20 GHz • Vector Signal Generator to 6 GHz • Dielectric Measurement Kit

  6. Microwave Research / Teaching Facilities • Software • Concerto - Full 3D EM simulator • Microstripes – Full 3D EM simulator • Genesys Microwave Design Software • General Mathematical Software • Mathcad, MATLAB • Labview for automatic control

  7. RF / Microwave Research Personnel • 4 Full Time Academic Staff ( Teaching ) • 2 Visiting Professors • 1 Visiting Fellow • 2 Post Doc Researchers • 5 Post Graduate Researchers • ( Full time Ph. D. students )

  8. Areas of Research • Main areas • Linear Amplification using Non-Linear Components ( LINC ) • Microwave holography • Other areas

  9. Linear Amplification using Non-Linear Components ( LINC ) • Allow high efficiency non-linear amps to be used • Divide signal into in-phase and quadrature components • Amplify • In-phase signals add - quadrature signals subtract

  10. Microwave Holography • Similar to Optical Holography • Only measure Intensity – inexpensive • Called Hologram • Have developed techniques for doing this at microwave frequencies • Can reconstruct Complex Field from hologram • Can use this information to obtain 3D images

  11. Holography Outline • Combine coherent scattered wave and reference wave • Phase difference appears as change in intensity • ( Hologram ) • Illuminate with original reference wave to reconstruct complex field • As phase is recovered we can get 3D image

  12. Applying Holography • We have successfully applied these techniques in a number of areas • Microwave Antenna Testing • Security Imaging • Medical Imaging

  13. Antenna Testing • Change conventional near field testing using Vector Analyser • Measure Holographic Intensity Patterns • Don’t need Vector Analyser, just a power meter • Can use same mathematical techniques to find far field radiation patterns • Can reconstruct aperture fields for antennas

  14. Antenna Testing • Holographic Near Field Testing System

  15. Antenna Testing • Adaptation of Conventional Near Field Testing Techniques

  16. Antenna Testing Results • Parabolic dish antenna far field radiation patterns

  17. Security Imaging • Only record Intensity • Quick and Cheap • Can reconstruct Magnitude and Phase of original scattered wave • Can use magnitude information to detect metallic objects • Need Phase information to detect non-metallic objects • Plastic explosives

  18. Security Imaging • Holographic Images of Gun cut-out • Left – Magnitude Right - Phase

  19. Security Imaging Magnitude Phase • Magnitude and Phase reconstructions of simulated plastic explosive

  20. Medical Imaging • Non-ionising imaging offers advantages over X-ray mammography • High contrast ratio between healthy and malignant tissue • Ability to resolve small targets • Good penetration into tissue • No health risk

  21. Medical Imaging – Experimental System

  22. Medical Imaging

  23. Conclusions • Outlined facilities for Microwave Research • Outlined areas of research • Outlined areas of application for microwave imaging • Presented results for these areas • Interested in developing these techniques for other areas

  24. Thank You

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