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Type: Journal article
Title: Fundamental limitations for antenna radiation efficiency
Author: Shahpari, M.
Thiel, D.V.
Citation: IEEE Transactions on Antennas and Propagation, 2018; 66(8):3894-3901
Publisher: IEEE
Issue Date: 2018
ISSN: 0018-926X
Statement of
Morteza Shahpari, David V. Thiel
Abstract: Small volume, finite conductivity, and high frequencies are major imperatives in the design of communications infrastructure. The radiation efficiency η r impacts on the optimal gain, quality factor, and bandwidth. The current efficiency limit applies to structures confined to a radian sphere ka (k is the wavenumber and a is the radius). Here, we present new fundamental limits to η r for arbitrary antenna shapes based on k 2 S , where S is the conductor surface area. For a dipole with an electrical length of 10 -5 our result is two orders of magnitude closer to the analytical solution when compared with previous bounds on the efficiency. The improved bound on η r is more accurate, more general, and easier to calculate than other limits. The efficiency of an antenna cannot be larger than the case where the surface of the antenna is peeled off and assembled into a planar sheet with area S, and a uniform current is excited along the surface of this sheet.
Keywords: Antenna efficiency; conductivity; efficiency; fundamental limit; skin depth; upper bound
Rights: © 2018 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.
RMID: 0030107380
DOI: 10.1109/TAP.2018.2836447
Grant ID:
Appears in Collections:Electrical and Electronic Engineering publications

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