Title:
RADIO WAVE ABSORBER AND COMPOUND
Document Type and Number:
WIPO Patent Application WO/2020/230448
Kind Code:
A1
Abstract:
Provided are: a radio wave absorber which does not have a metal layer and in which the transmission attenuation amount and the reflection attenuation amount are both 10 dB or more in the millimeter wave band; and a compound. Provided are: the radio wave absorber which has a radio wave absorption layer that contains a magnetic powder and a binder and which does not have a metal layer, wherein the packing ratio of the magnetic powder in the radio wave absorption layer is 35 vol% or less, and the relationship 0.65 ≤ (P/100) × Q is satisfied, with P (vol%) denoting the packing ratio of the magnetic powder in the radio wave absorption layer and Q (mm) denoting the thickness of the radio wave absorption layer; and the compound.
Inventors:
HASHIMOTO HIROKAZU (JP)
Application Number:
PCT/JP2020/011872
Publication Date:
November 19, 2020
Filing Date:
March 18, 2020
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
H01F1/34; H01F1/375; H05K9/00
Domestic Patent References:
| WO2018235952A1 | 2018-12-27 |
Foreign References:
| JP2005231931A | 2005-09-02 | |||
| JP2013239637A | 2013-11-28 | |||
| JP2002185180A | 2002-06-28 | |||
| JP2000228599A | 2000-08-15 | |||
| JPS57180206A | 1982-11-06 | |||
| JP2000232294A | 2000-08-22 | |||
| JP2008300801A | 2008-12-11 | |||
| JP2018056492A | 2018-04-05 | |||
| JP4674380B2 | 2011-04-20 |
Other References:
See also references of EP 3971921A4
Attorney, Agent or Firm:
NAKASHIMA Junko et al. (JP)
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