The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 2024
Filed:
Jun. 28, 2021
3m Innovative Properties Company, St. Paul, MN (US);
Fan Long, Panyu District, CN;
Bharat R. Acharya, Woodbury, MN (US);
Jaewon Kim, Woodbury, MN (US);
Jingfei Chen, Shanghai, CN;
Huijie Xie, Beijing, CN;
Zhe Hu, Suzhou, CN;
3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US);
Abstract
An optical stack () includes a substrate (), a radio-wave anti-reflection sheet () configured to reduce reflection from the optical stack () of radio waves at a predetermined operating frequency (f), and a visible light reflective, infrared light transmissive multilayer optical film () disposed between the radio-wave anti-reflection sheet () and the substrate (). For radiation substantially normally incident on the radio-wave anti-reflection sheet () and for a first frequency range at least 20 GHZ wide, centered on the predetermined operating frequency (f), and disposed between about 1 GHZ and about 120 GHZ, a return loss of the optical stack () is asymmetric about the predetermined operating frequency (f) in the first frequency range. The optical stack () has a largest return loss SL in the first frequency range of less than −10 dB and a difference between the largest return loss SL and a smallest return loss SS in the first frequency range is less than about 2 dB.