NDLI: Unusual features of the pseudo non-diffracting microwave vortex

Content Provider	IEEE Xplore Digital Library
Author	Speciale, R.A.
Copyright Year	2007
Description	Author affiliation: R&D Inc., Tokyo (Speciale, R.A.)
Abstract	A recently formulated, planar, circular-aperture field-distribution has been found to generate a radiation pattern exhibiting fundamentally-unusual features [1]. The aperture electric-field Eoarr , and magnetic field Hoarr were defined as linear-combinations of the W. W. Hansen's Moarr , and Moarr and Noarr basis vector-fields, and exactly satisfy therefore the Vector- Helmholtz equations for homogeneous, isotropic free-space [2]. Further, both the Eoarr and Hoarr fields generated by that aperture field-distribution include, in cylindrical coordinates, the axial $E_{z}$ and $H_{z}$ components, besides the $E_{r},$ $E_{phi}$ , $H_{r},$ and $H_{phi}$ tangential components. Also, most remarkably, the radial component $S_{r}$ $^{}$ of the complex Poynting Vector is identically-zero, everywhere on and above the aperture-plane, at all radial distances from the broadside-axis, and at all axial-distances from the aperture- plane, while the broadside-directed axial component $S_{z}$ $^{*}$ includes a very sharp center- lobe, with a maximum radius, on the aperture-plane, in the order of a half free-space wavelength. That center-lobe also contains most of the total power radiated from the whole aperture. The actual diffraction-pattern of that center-lobe, that actually is the main-beam of the generated radiation-pattern, is being determined using the ";Direct Electromagnetic Field Integration"; method, reported by Walter Franz in 1948 [3], and reviewed by Chen-To Tai in 2000 [4]. The planar, circular aperture is truncated, in that diffraction analysis, at an arbitrary maximum radius, by applying various edge-tapers of different shapes, with free-space all around the aperture-edge and behind the aperture- plane. The main beam of the generated radiation-pattern appears to have a wave-front in the form of a 3D helicoid-surface, becoming thus the microwave equivalent of an "optical vortex". The main beam is therefore expected to propagate through free-space almost as a guided circular-waveguide mode would.
Starting Page	4040
Ending Page	4043
File Size	220327
Page Count	4
File Format	PDF
ISBN	9781424408771
DOI	10.1109/APS.2007.4396427
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Apertures Electromagnetic diffraction Magnetic fields Equations Electromagnetic radiation Electromagnetic fields Shape Microwave generation Optical vortices Microwave propagation
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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