Multiloop antenna arrays for high-frequency shipboard direction finding

Travers, Douglas N.; Moore, James D.; Sherrill, William M.

doi:10.1109/tap.1965.1138533

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…These were deployed as diversity [Van Wambeck and Ross, 1951] and for direction finding applications [Travers et al, 1965] on the receiver side. A very simple high frequency direction finding system (HFDF) was employed by the allies against the German Uboats in the Second World War [Crampton, 1947].…”

Section: Hf Antenna Arraysmentioning

confidence: 99%

An experimental investigation into the feasibility of MIMO techniques within the HF band

Abbasi

2007

2nd European Conference on Antennas and Propagation (EuCAP 2007)

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An experimental investigation into the feasibility of MIMO techniques within the HF band Abstract MIMO research so far has primarily focussed on the VHF-SHF frequency bands with an aim to increase the data rates achieved over a limited spectrum. MIMO requires a rich scattering environment in order to create parallel spatial data pipes between antennas at the transmitter and the receiver. The HF band is also affected by the multipath effects through reflections in the different layers of the ionosphere and hence is a suitable candidate for MIMO. It was determined that antenna modelling could be used to design small, collocated antenna arrays for HF-MIMO application.This research may act as the foundation stone on which the future endeavours into the application of MIMO techniques in the HF band could be built.iii Acknowledgement It is a pleasure for me to thank the people who contributed towards this research. My gratitude goes to Professor Mike Warrington who supervised this research and was always willing to encourage and support me in addition to the invaluable input and suggestions. Dr. David Siddle as co-supervisor was always there to listen and advise, no matter how busy he was. I would also like to acknowledge Dr. Salil Gunashekar for his forthcoming support and co-operation throughout this project.I am indebted to my wife who supported me all along and showed great patience. She shielded me from many day to day worries and allowed me the time and space to concentrate on my research.

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Section: Hf Antenna Arraysmentioning

confidence: 99%

An experimental investigation into the feasibility of MIMO techniques within the HF band

Abbasi

2007

2nd European Conference on Antennas and Propagation (EuCAP 2007)

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“…Equation (5) shows that the surface integral of the imaginary part of the Poynting vector depends on the integration surface S in the near field region. Taking the real part of (2), we obtain the radiated power…”

Section: Poynting Theorem and Electric And Magnetic Field Energy Stormentioning

confidence: 99%

“…However, the nature of the generalized resonance in an open system can not be revealed completely. Therefore, a rigorous analysis of resonant behaviors in EMC has been an interesting and challenging problem for years [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study of Generalized Resonance in Multi-Antenna System and Generalized Foster Reactance Theorem

Li¹,

Liu²,

Shi³

et al. 2005

PIER

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Abstract-This paper begins with a complete description of the complex Poynting theorem, followed by a rigorous study of the generalized resonance in a multi-antenna system. The condition generating the generalized resonance is discussed, which is the balance of the electromagnetic fields energy stored in the antennas open system. The matrix expression of the generalized resonant factor (GRF ) is derived. On this basis, the generalized Foster reactance theorem for an arbitrary antenna system is presented and radiation Q is used to further describe the generalized resonance behaviors. Some practical examples have shown that the generalized resonance may take on the phenomena of strong and sharp fields in the near zone and superdirectivity in the far zone of the antenna system.

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A Survey of HF Interferometry for Ionospheric Propagation Research

Sherrill¹

1971

Radio Science

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The transform relation between the field distribution and the angular spectrum forms the basis for the application of interferometry to propagation research. It is convenient to divide interferometry into instrumental combination and transform techniques which measure these Fourier relations to provide propagation mode resolution in terms of direction and angular width. Conventional direction‐finder instrumentation represents the limiting case of single plane wave solution to the interference field. Computer instrumented interferometers and sampling arrays provide the capability for more general wave field analysis based on non plane wave models. This paper is a summary of interferometry techniques for direction finding, angular spectrum, angular width, and coherence ratio measurements and reviews the evolution of interferometers for propagation research. The reference list includes works from the radio astronomy and propagation literature relevant to fundamental interference analysis and interferometer instrumentation.

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Multiloop antenna arrays for high-frequency shipboard direction finding

Cited by 10 publications

References 4 publications

An experimental investigation into the feasibility of MIMO techniques within the HF band

An experimental investigation into the feasibility of MIMO techniques within the HF band

Study of Generalized Resonance in Multi-Antenna System and Generalized Foster Reactance Theorem

A Survey of HF Interferometry for Ionospheric Propagation Research

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