Gradient permittivity film
Assignee3M Innovative Properties Company
InventorsMohsen Salehi, Stephen J. Etzkorn, Jaewon Kim, Brett J. Sitter
Life of this patent
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Abstract
A gradient permittivity film comprises (a) a first permittivity layer comprising a first continuous matrix of a first material having a first relative permittivity (εr1) and a second component having a second relative permittivity (εr2) dispersed in the first continuous matrix, the first permittivity layer having a first effective layer relative permittivity (ε1) and a thickness (T1); and (b) a second permittivity layer having a second effective layer relative permittivity (ε2) and a thickness (T2) disposed on the first permittivity layer T1=0.8(t1) to 1.2(t1), where t1=(I); T2=0.8(t2) to 1.2 (T2), where T2=(II). t 1 = c 4 f ε 1 ( I ) t 2 = c 4 f ε 2 ( II )
Claims46
A gradient permittivity film comprising:
- a first permittivity layer comprising a first continuous matrix of a first material having a first relative permittivity (εr1) and a second component having a second relative permittivity (εr2) dispersed in the first continuous matrix, the first permittivity layer having a first effective layer relative permittivity (ε1) and a thickness (T1);
- and
- a second permittivity layer having a second effective layer relative permittivity (ε2) and a thickness (T2) disposed on the first permittivity layer;
- wherein the gradient permittivity film has a haze greater than 50% or a transmission of visible light less than 50%;
- and
- wherein:
- ε1 is greater than ε2 by at least 10% for at least one frequency (f) within a frequency range between 20 GHz and 300 GHz,
- ε
- 1
- =
- 1.1
- to
-
- 10
-
- ε
- 2
- =
- 1.11
- to
-
- 10
-
- T
- 1
- =
- 0.8
- (
- t
- 1
- )
-
- to
- 1.2
- (
- t
- 1
- )
- ,
- where
-
- t
- 1
- =
- c
- 4
-
- f
-
- ε
- 1
-
- T
- 2
- =
- 0.8
- (
- t
- 2
- )
-
- to
- 1.2
- (
- t
- 2
- )
- ,
- where
-
- t
- 2
- =
- c
- 4
-
- f
-
- ε
- 2
-
- ε
- r
-
- 1
-
- is
-
- greater
-
- than
-
- ε
- r
-
- 2
-
- for
-
- the
-
- frequency
-
- f
- .
A gradient permittivity film comprising:
- a first permittivity layer comprising a first continuous matrix of a first material having a first relative permittivity (εr1) and a second component having a second relative permittivity (εr2) dispersed in the first continuous matrix, the first permittivity layer having a first effective layer relative permittivity (ε1) and a thickness (T1);
- and
- a second permittivity layer having a second effective layer relative permittivity (ε2) and a thickness (T2) disposed on the first permittivity layer;
- wherein the gradient permittivity film has a haze greater than 50% or a transmission of visible light less than 50%;
- and
- wherein:
- ε1 is greater than ε2 by at least 10% for at least one frequency (f) within a frequency range between 20 GHz and 300 GHz,
- ε1=1.1 to 10
- ε1=1.11 to 10
- T1=0.8(t1) to 1.2(t1), where
- t
- 1
- =
- c
- 2
-
- f
-
- ε
- 1
- T2=0.8(t2) to 1.2(t2), where
- t
- 2
- =
- c
- 4
-
- f
-
- ε
- 2
- εr1 is greater than εr2 for the frequency f.
Dependencies are inferred from the claim text.