Electromagnetic wave absorber evaluation apparatus and electromagnetic wave absorber evaluation method

An electromagnetic wave absorber evaluation apparatus for evaluating characteristics of an electromagnetic wave absorber, the apparatus comprising:

• a housing in which the electromagnetic wave absorber is allowed to be arranged, the housing being made of a conductive material with inner dimensions of a width a, a height b, and a length L, as b≤a≤L;
• a substrate arranged inside the housing;
• an input microstrip line and an output microstrip line formed on the substrate along a length direction of the housing and separated from each other in the length direction;
• and
• a signal inspecting unit capable of inputting an input signal having a frequency of 20 GHz or more into the input microstrip line and detecting an output signal output through the output microstrip line, wherein
• an evaluation frequency ft obtained by the following Formula (1) satisfies the following Formula (2) in a frequency region of 20 GHz or more,
• f
• t
• =
• 1
• 2
• ⁢
• α
• ⁢
• (
• m
• a
• )
• 2
• +
• (
• p
• L
• )
• 2
• (
• 1
• )
• 1
• 2
• ⁢
• α
• ⁢
• a
• ≤
• f
• t
• ≤
• 1
• 2
• ⁢
• α
• ⁢
• b
• (
• 2
• )
• where m and p are mutually independent and are integers of 1 or more, α is expressed by Formula (5) using μr and εr obtained based on the following Formula (3) and Formula (4) in the case where n substances exist in a region surrounded by the housing and when setting a complex relative magnetic permeability of an i-th substance among the substances to μri, a complex relative dielectric constant thereof to εri, and an area occupied by a cross section thereof orthogonal to the length direction of the housing to Si, μ0 is a vacuum magnetic permeability and ε0 is a vacuum dielectric constant,
• μ
• r
• =
• ∑
• i
• =
• 1
• n
• μ
• ri
• ⁢
• S
• i
• ab
• (
• 3
• )
• ε
• r
• =
• ∑
• i
• =
• 1
• n
• ε
• ri
• ⁢
• S
• i
• a
• ⁢
• b
• (
• 4
• )
• α
• =
• ❘
• "\[LeftBracketingBar]"
• μ
• r
• ⁢
• μ
• 0
• ⁢
• ε
• r
• ⁢
• ε
• 0
• ❘
• "\[RightBracketingBar]"
• .
• (
• 5
• )