DISPERSION OF ELECTROMAGNETIC WAVES GUIDED BY AN OPEN TAPE HELIX I | Zendy

N. Kalyanasundaram | Zendy; G. Naveen Babu | Zendy

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DISPERSION OF ELECTROMAGNETIC WAVES GUIDED BY AN OPEN TAPE HELIX I

Author(s) -

N. Kalyanasundaram,

G. Naveen Babu

Publication year - 2009

Publication title -

progress in electromagnetics research b

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.208

H-Index - 47

ISSN - 1937-6472

DOI - 10.2528/pierb09052608

Subject(s) - dispersion (optics) , physics , dispersion relation , helix (gastropod) , boundary value problem , perpendicular , electromagnetic radiation , maxwell's equations , mechanics , transverse plane , mathematical analysis , optics , geometry , classical mechanics , mathematics , structural engineering , quantum mechanics , snail , engineering , ecology , biology

The dispersion equation for electromagnetic waves guided by an open tape helix for the standard model of an inflnitesimally thin and perfectly conducting tape is derived from an exact solution of a homogeneous boundary value problem for Maxwell's equations. A numerical analysis of the dispersion equation reveals that the tape current density component perpendicular to the winding direction does not afiect the dispersion characteristic to any signiflcant extent. In fact, there is a signiflcant deviation from the dominant-mode sheath- helix dispersion curve only in the third allowed region and towards the end of the second allowed region. It may be concluded that the anisotropically conducting model of the tape helix that neglects the above transverse-current contribution is a good approximation to the isotropically conducting model that takes into account this contribution except at high frequencies even for wide tapes.

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