Samvardhana Motherson International has been granted a patent for a cover for antennas that emit or sense electromagnetic radiation. The cover includes a substrate that allows transmission of radiation in a certain frequency band, and a coating that is reflective for radiation in a different frequency band. The cover also includes a transparent covering layer or a non-transmissible and/or opaque second coating. GlobalData’s report on Samvardhana Motherson International gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Samvardhana Motherson International, vehicle battery cooling systems was a key innovation area identified from patents. Samvardhana Motherson International's grant share as of September 2023 was 58%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a cover for antennas with frequency selectivity

Source: United States Patent and Trademark Office (USPTO). Credit: Samvardhana Motherson International Ltd

A recently granted patent (Publication Number: US11764467B2) describes a cover for antennas that emit or sense electromagnetic radiation in radar frequency bands. The cover includes a substrate that allows transmission of electromagnetic radiation in the radar frequency band and a second frequency band that includes visual light. The substrate is coated with a first coating that acts as a frequency selective surface bandpass filter. This coating is transparent to the radar frequency band but reflects radiation in the second frequency band. The cover may also include a covering layer that is transparent or semi-transparent to the second frequency band, or a second coating that is non-transmissible or opaque in the second frequency band.

The patent also mentions that the antenna can be a radar antenna and provides specific frequency bands for the radar frequency, such as 10 GHz to 130 GHz, 20 GHz to 100 GHz, and 70 GHz to 80 GHz. The substrate is capable of transmitting electromagnetic radiation in a third frequency band, which may partially overlap with the second frequency band. The first coating can be located between the substrate and the antenna or on the side of the substrate facing the antenna. Additionally, stress controlling layers may be present between the substrate and the first coating.

The cover may also include a second coating or a masking layer that is non-transmissible or opaque in certain frequency bands. The frequency bands mentioned include the second, third, fourth, and fifth frequency bands, as well as the radar frequency band. The cover can be made from various materials such as thermoplastics, polycarbonate, polymethylmethacrylate, and polyethylene. The first coating can be made from metallic materials like chrome, aluminum, and gold, and can have repetitive patterns formed by elements such as crosses, circles, squares, and lines.

The patent also describes a method for producing the cover, which involves providing a substrate that is transmissible to the radar frequency band and the second frequency band, and then coating the substrate with the first coating. The frequency selective surface bandpass filter is created by structuring the first coating through laser etching. The method may also involve applying a masking layer before the first coating and using sputtering or PVD magnetron sputtering deposition to produce the first coating. Additional coatings, such as hard coats or stress controlling layers, may also be provided.

Overall, this patent presents a cover design for antennas that allows transmission of radar frequency radiation while reflecting radiation in the visual light frequency band. The design and manufacturing method described in the patent offer potential applications in various industries that utilize radar technology.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.