Lower bounds on Q of some dipole shapes

Oleksiy S. Kim

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    The lower bound on the radiation Q of an arbitrary electrically small antenna shape can be determined by finding the optimal electric current density on the exterior surface of the shape, such that the Q of this current radiating in free space is minimized, and then augmenting it with a magnetic current density cancelling the fields inside the shape's surface. The Q of these coupled electric and magnetic currents radiating in free space is the lower bound on Q for the given shape. The approach is exemplified and its general applicability is substantiated by computing the lower bounds of spherically capped dipoles and comparing the results to the known bounds of a sphere and a thin cylinder.
    Original languageEnglish
    Title of host publication2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting
    Publication date2016
    ISBN (Print)9781509028856
    Publication statusPublished - 2016
    Event2016 IEEE Antennas and Propagation Society International Symposium - El Conquistador Hotel and Resort, Fajardo, Puerto Rico
    Duration: 26 Jun 20161 Jul 2016


    Conference2016 IEEE Antennas and Propagation Society International Symposium
    Location El Conquistador Hotel and Resort
    Country/TerritoryPuerto Rico
    Internet address


    • Shape
    • Dipole antennas
    • Current
    • Solids
    • Antenna radiation patterns
    • Limiting


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