Radar standing wave dampening components and systems

Patent metadata

Field	Value
Publication number	US-11749900-B2
Application number	US-201917044054-A
Country	US
Kind code	B2
Filing date	Apr 4, 2019
Priority date	Apr 6, 2018
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

Radar standing wave dampening systems and components are described. In particular, systems and components including an absorber composite including at least one of ceramic filler, magnetic filler, or conductive filler materials are described. Such components can reduce the intensity of standing waves and may also be combined in systems with one or more gradient permittivity tapes or films.

First claim

What is claimed is:

1. A radar standing wave dampening system, comprising: a mount including a printed circuit board; a radio wave generating unit disposed on the mount; a radio wave sensing unit disposed on the mount; a non-target interface at a fixed distance from the radio wave generating unit, wherein the non-target interface has a relative permittivity for the frequency range of the radio waves greater than 1; and a gradient permittivity tape comprising an array of at least one of cones and pyramids disposed on the non-target interface; wherein the printed circuit board is a multilayer stack, and at least one layer includes an absorber composite including at least one of ceramic filler, magnetic filler, or conductive filler materials.

2. The radar standing wave dampening system of claim 1 , wherein the at least one of ceramic filler, conductive filler, or magnetic filler materials are disposed within a polymeric matrix.

3. The radar standing wave dampening system of claim 2 , wherein the polymeric matrix forms a film and is adhered to the printed circuit board.

4. The radar standing wave dampening system of claim 1 , wherein the absorber composite includes ceramic filler materials and the ceramic filler materials include at least one of cupric oxide or titanium(II) oxide.

5. The radar standing wave dampening system of claim 1 , wherein the absorber composite includes conductive filler materials and the conductive filler materials include at least one of carbon black, carbon bubbles, carbon foam, graphene, carbon fiber, graphite, carbon nanotubes, metal particles, metal nanoparticles, metal alloy particles, metal nanowires, polyacrylonitrile fibers, or conductive-coated particles.

6. The radar standing wave dampening system of claim 1 , wherein the absorber composite includes magnetic filler materials and the magnetic filler materials include at least one of Sendust, carbonyl iron, permalloy, ferrites, or garnets.

7. The radar standing wave dampening system of claim 1 , wherein the absorber composite is coated on one side of the printed circuit board.

8. The radar standing wave dampening system of claim 1 , wherein the absorber composite is coated on both sides of the printed circuit board.

9. The radar standing wave dampening system of claim 1 , wherein the gradient permittivity tape includes at least one of plastic bubbles, glass bubbles, ceramic bubbles, gas bubbles, or air bubbles.

10. The radar standing wave dampening system of claim 1 , wherein the gradient permittivity tape includes a nonwoven.

11. The radar standing wave dampening system of claim 1 , wherein the non-target interface is a vehicle fascia.

12. The radar standing wave dampening system of claim 1 , wherein the non-target interface is a radome.

13. The radar standing wave dampening system of claim 1 , further comprising a second non-target interface a second fixed distance from the radio wave generating unit.

14. The radar standing wave dampening system of claim 13 , comprising a gradient permittivity tape disposed on each of the non-target interface and the second non-target interface.

15. The radar standing wave dampening system of claim 14 , wherein the gradient permittivity tape includes at least one of plastic bubbles, glass bubbles, ceramic bubbles, gas bubbles, or air bubbles.

16. The radar standing wave dampening system of claim 14 , wherein the gradient permittivity tape includes a nonwoven.

Assignees

• 3M Innovative Properties Company

Inventors

• Ghosh Dipankar
• Kim Jaewon
• Etzkorn Stephen J
• Jesme Ronald D
• Salehi Mohsen
• Du Guanglei
• Wheatley John A

Classifications

• G01S7/027

  Constructional details of housings, e.g. form, type, material or ruggedness · CPC title

• G01S7/03

  Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver · CPC title

• G01S13/931

  of land vehicles · CPC title

• H01Q17/004 Primary

  using non-directional dissipative particles, e.g. ferrite powders (H01Q17/005 takes precedence; flake-like H01Q17/002) · CPC title

• H01Q1/3233

  particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems · CPC title