Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 59, Issue 6, Pages 2196-2204Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2011.2143688
Keywords
High-impedance surface; physical bounds; sum rule; Herglotz function
Funding
- Swedish Research Council (VR)
- Swedish Foundation of Strategic Research (SSF)
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High-impedance surfaces are artificial surfaces synthesized from periodic structures. The high impedance is useful as it does not short circuit electric currents and reflects electric fields without phase shift. Here, a sum rule is presented that relates frequency intervals having high impedance with the thickness of the structure. The sum rule is used to derive physical bounds on the bandwidth for high-impedance surfaces composed by periodic structures above a perfectly conducting ground plane. Numerical examples are used to illustrate the result, and show that the physical bounds are tight.
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