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Patent Searching and Data


Title:
LUNEBERG LENS AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO2004086563
Kind Code:
A8
Abstract:
A Luneberg lens having a single-layer structure or a multilayer structure containing a plurality of layers having different dielectric constants, wherein the respective structure is produced by mixing a polyolefin resin and/or a derivative thereof with an inorganic filler having a high dielectric constant, the volume ratio of the polyolefin resin and/or the derivative thereof to the filler being 99 to 50 : 1 to 50, adding a foaming agent to the resulting resin mixture and then performing preliminary expansion, and molding the resulting pre-expanded beads; and wherein at least a foamed dielectric layer having a dielectric constant of 1.5 or more is formed using the pre-expanded beads that have been subjected to classification and selection such that f(A) satisfies the expression 0.0005 ≤ f(A) ≤ 0.1, where f(A) is represented by the equation: f(A) = sigma a/Aave, sigma a is the deviation of a gas volume fraction Ar in the foamed dielectric layer, and Aave is the average of the gas volume fractions Ars at positions in the foamed dielectric layer.

Inventors:
KURODA MASATOSHI (JP)
KISHIMOTO TETSUO (JP)
KIMURA KOUICHI (JP)
Application Number:
PCT/JP2004/002656
Publication Date:
December 29, 2004
Filing Date:
March 03, 2004
Export Citation:
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Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
KURODA MASATOSHI (JP)
KISHIMOTO TETSUO (JP)
KIMURA KOUICHI (JP)
International Classes:
B29C44/44; H01Q15/08; H01Q15/23; H01Q19/06; H01Q25/00; (IPC1-7): H01Q15/08; B29C44/00; C08J9/228
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