公开(公告)号：US20210285843A1

公开(公告)日：2021-09-16

申请号：US16332470

申请日：2017-09-12

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Benjamin J. MUENSTERMANN ,  Christian WEINMANN ,  Bernd KUEHNEWEG ,  Andrea DEN DRIJVER ,  Ivan V. NESHATAEV ,  Walter TESCH ,  Zohaib HAMEED ,  Mohsen SALEHI

IPC: G01M5/00 ,  G06K7/10 ,  B64F5/60

Abstract: A method for monitoring the surface of a device to physical and/or environmental exposure, the method comprising: • (a) attaching at least one sensor including a reactance autotuning integrated circuit to a surface of a device; • (b) attaching a reader in proximity to the sensor; • (c) measuring a reference reactance of the sensor with the reader at a selected frequency; • (d) continually monitoring for changes in the reactance of the sensor at the selected frequency, wherein changes to the reactance are digitized by the autotuning circuit; and • (e) comparing differences between the reference reactance and changes to the monitored reactance to determine if said surface of the device has been subjected to physical and/or environmental exposure.

公开(公告)号：US20230253701A1

公开(公告)日：2023-08-10

申请号：US18189780

申请日：2023-03-24

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Mohsen SALEHI ,  Stephen J. ETZKORN ,  Jaewon KIM ,  Brett J. SITTER

IPC: H01Q1/42 ,  H01Q1/32 ,  B32B7/025 ,  B32B27/08 ,  B32B7/12 ,  B32B5/02 ,  B32B27/12 ,  B32B17/10

CPC classification number: H01Q1/424 ,  H01Q1/3283 ,  H01Q1/421 ,  B32B7/025 ,  B32B27/08 ,  B32B7/12 ,  B32B5/022 ,  B32B27/12 ,  B32B17/10

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







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




.

公开(公告)号：US20210028538A1

公开(公告)日：2021-01-28

申请号：US17045582

申请日：2019-04-05

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Ronald D. JESME ,  Jaewon KIM ,  Stephen J. ETZKORN ,  Dipankar GHOSH ,  Mohsen SALEHI ,  Guanglei DU ,  John A. WHEATLEY

IPC: H01Q1/42 ,  C08F220/10 ,  C08K7/28 ,  C08K3/40 ,  C08J5/18 ,  C09J7/24 ,  C09J11/04

Abstract: Gradient permittivity films are described. In particular, gradient permittivity films that include a first continuous matrix of a first component having a first relative permittivity and a second component disposed within the continuous matrix having a second relative permittivity. The first permittivity is greater than the second permittivity for at least one wavelength between 20 GHz and 300 GHz. Such films may be useful in improving the signal to noise ratio for transmitting and receiving units behind a protective cover.

公开(公告)号：US20210159591A1

公开(公告)日：2021-05-27

申请号：US17045559

申请日：2019-04-05

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Mohsen SALEHI ,  Stephen J. ETZKORN ,  Jaewon KIM ,  Brett J. SITTER

IPC: H01Q1/42 ,  H01Q1/32

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  ɛ 1 ( I ) t 2 = c 4  f  ɛ 2 ( II )