LUNEBERG LENS AND PROCESS FOR PRODUCING THE SAME

Title:

LUNEBERG LENS AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2004/086563

Kind Code:

A1

Abstract:

A Luneberg lens of monolayer structure or multilayer structure composed of a combination of two or more layers of different dielectric constants, the Luneberg lens produced by adding a blowing agent to a resin mixture obtained by mixing a polyolefin resin and/or a derivative thereof with an inorganic filler of high dielectric constant at a volume ratio of 99 to 50 (resin) : 1 to 50 (filler), pre-expanding the obtained mixture into pre-expanded beads and molding the pre-expanded beads, wherein at least a dielectric expanded layer of 1.5 or higher dielectric constant is formed of pre-expanded beads having undergone classification and screening and wherein the value of f(A) represented by the formula f(A) = &sgr a / Aave, in which &sgr a is a deviation of gas volume fraction (Ar) in the dielectric expanded layer while Aave is an average of gas volume fractions (Ar) at portions of the dielectric expanded layer, satisfies the relationship 0.0005 ≤ f(A) ≤ 0.1.

Inventors:

KURODA MASATOSHI (JP)
KISHIMOTO TETSUO (JP)
KIMURA KOUICHI (JP)

Application Number:

PCT/JP2004/002656

Publication Date:

October 07, 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

Foreign References:

JP2002121310A	2002-04-23
JP2001316514A	2001-11-16
JP2001279014A	2001-10-10
JP2001250423A	2001-09-14
JP2001229735A	2001-08-24
JPH066126A	1994-01-14
JPH08167811A	1996-06-25
JP2002197923A	2002-07-12
JPH09130137A	1997-05-16
JPH0722834A	1995-01-24
JPH03179805A	1991-08-05
JPH05334934A	1993-12-17

Other References: