NDLI: The Q of dipole, TM radiation fields

Content Provider	IEEE Xplore Digital Library
Author	Grimes, D.M. Grimes, C.A.
Copyright Year	1998
Description	Author affiliation: Dept. of Phys. & Astron., Kentucky Univ., Lexington, KY, USA (Grimes, D.M.)
Abstract	We first critically review earlier attempts to define and calculate Q in unconfined radiation fields and decide that none are fully satisfactory. We then define Q to be the product of /spl omega/ times the ratio of the peak standing energy to the time average output power, and use that definition to obtain the exact Q of a single electric dipole. The result is identical with the result based upon Chu's model. Although in exact agreement for a single mode, our methodology shows that significant differences arise in mixed modal fields. As an example we characterize two ideal, collocated and perpendicularly oriented electric dipoles and calculate the standing energy. The equations show that Q is reduced by two factors. The first, shown by Chu in his original paper (1948), is that if collocated, parallel TM and TE dipoles ate driven with circular polarization the fields are unaffected but, very nearly, the standing energy is counted once and the output power counted twice, dropping Q by about a factor of two. With our collocated, circularly polarized, and properly driven TM dipoles some of the standing energies cancel and some standing energy associated with the source when the dipoles are in phase appears to become dissociated from it when the dipoles are phased /spl pi//2 apart. The result is a net reduction of Q by 1/3.
Starting Page	255
Ending Page	263
File Size	740706
Page Count	9
File Format	PDF
ISBN	0780343115
ISSN	1095323X
DOI	10.1109/AERO.1998.685811
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-28
Publisher Place	Colorado
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power generation Polarization Physics Astronomy Equations Tellurium Biographies Resonance Electromagnetic fields Electromagnetic heating
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

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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
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7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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