Electromagnetic-radiation-reflecting structure, article of clothing having an electromagnetic-radiation-reflecting structure, use of such an electromagnetic-radiation-reflecting structure, and system for detecting a user
An electromagnetic-radiation-reflecting structure that is attached at a location on a user's body. The electromagnetic-radiation-reflecting structure generating, as the user proceeds in usual fashion, a micro-Doppler effect as a result of its attachment at the location on the body so that a radar cross section of the user is increased, a material of the electromagnetic-radiation-reflecting structure having a conductivity greater than 100 S/m or a conductivity less than 100 S/m, a relative permeability between 100 and 10 5 , and a relative permittivity between 1 and 14; or has a conductivity less than 100 S/m, a relative permeability between 1 and 100, and a relative permittivity between 7 and 14; and a surface area of the electromagnetic-radiation-reflecting structure ( 120 ) is greater than 1000 mm 2 .
1. An electromagnetic-radiation-reflecting structure that is attached at a location on a body of a user, the electromagnetic-radiation-reflecting structure configured to generate, as the user proceeds in usual fashion, a micro-Doppler effect as a result of the attachment at the location on the body so that a radar cross section of the user is increased;
wherein a material of the electromagnetic-radiation-reflecting structure has:
(i) a conductivity less than 100 S/m, a relative permeability between 100 and 10 5 , and a relative permittivity between 1 and 14, or
(ii) a conductivity less than 100 S/m, a relative permeability between 1 and 100, and a relative permittivity between 7 and 14; and
wherein a surface area of the electromagnetic-radiation-reflecting structure is greater than 1000 mm 2 .
2. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein:
the electromagnetic-radiation-reflecting structure has a surface filling ratio of between 80 and 100%; and
the surface area of the electromagnetic-radiation-reflecting structure is greater than 2000 mm 2 .
3. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein:
the electromagnetic-radiation-reflecting structure has a surface filling ratio of between 40 and 80%; and
the surface area of the electromagnetic-radiation-reflecting structure is greater than 4000 mm 2 .
4. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein:
the electromagnetic-radiation-reflecting structure has a surface filling ratio below 100%; and
a minimum distance between conductive parts of the electromagnetic-radiation-reflecting structure is less than 1.95 mm.
5. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein a radar cross section of the electromagnetic-radiation-reflecting structure is greater than or equal to 1 dBm 2 .
6. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein the location on the body of the user at which the electromagnetic-radiation-reflecting structure is attached is on an arm or on a leg.
7. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein the electromagnetic-radiation-reflecting structure is stamped, and/or molded, and/or stitched, and/or printed.
8. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein:
(i) the electromagnetic-radiation-reflecting structure is attached to or integrated into a fabric; or
(ii) the electromagnetic-radiation-reflecting structure is a fabric.
9. The electromagnetic-radiation-reflecting structure as recited in claim 8 , wherein the fabric encompasses cotton, and/or plastic, and/or metal.
10. The electromagnetic-radiation-reflecting structure as recited in claim 1 , further comprising:
a transponder that is embodied and configured to reflect a signal.
11. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein the transponder is an RFID label or an RFID tag.
12. An article of clothing having an electromagnetic-radiation-reflecting structure, the electromagnetic-radiation-reflecting structure being configured to be situated at a location on a body of a user, the electromagnetic-radiation-reflecting structure configured to generate, as the user proceeds in usual fashion, a micro-Doppler effect as a result of the electromagnetic-radiation-reflecting structure being situated at the location on the body so that a radar cross section of the user is increased;
wherein a material of the electromagnetic-radiation-reflecting structure has:
(i) a conductivity less than 100 S/m, a relative permeability between 100 and 10 5 , and a relative permittivity between 1 and 14, or
(ii) a conductivity less than 100 S/m, a relative permeability between 1 and 100, and a relative permittivity between 7 and 14; and
wherein a surface area of the electromagnetic-radiation-reflecting structure is greater than 1000 mm 2 .
13. A method, comprising:
attaching an electromagnetic-radiation-reflecting structure at a location on a body of a user that, as the user proceeds in usual fashion, generates a micro-Doppler effect as a result of its attachment at the location on the body, so that a radar cross section of the user is increased;
wherein a material of the electromagnetic-radiation-reflecting structure has:
(i) a conductivity less than 100 S/m, a relative permeability between 100 and 10 5 , and a relative permittivity between 1 and 14, or
(ii) a conductivity less than 100 S/m, a relative permeability between 1 and 100, and a relative permittivity between 7 and 14; and
wherein a surface area of the electromagnetic-radiation-reflecting structure is greater than 1000 mm 2 .
14. A system for detection of a user who is proceeding in usual fashion, the system comprising:
a radar transceiver configured to transmit and receive radar signals, the radar transceiver being embodied and configured in such a way that the radar transceiver can detect a change in a micro-Doppler component in a radar signal reflected from an electromagnetic-radiation-reflecting structure;
wherein the electromagnetic-radiation-reflecting structure is an electromagnetic-radiation-reflecting structure attached at a location on a body of the user, the electromagnetic-radiation-reflecting structure configured to generate, as the user proceeds in the usual fashion, the micro-Doppler effect as a result of the attachment at the location on the body so that a radar cross section of the user is increased;
wherein a material of the electromagnetic-radiation-reflecting structure has:
(i) a conductivity less than 100 S/m, a relative permeability between 100 and 10 5 , and a relative permittivity between 1 and 14, or
(ii) a conductivity less than 100 S/m, a relative permeability between 1 and 100, and a relative permittivity between 7 and 14; and
wherein a surface area of the electromagnetic-radiation-reflecting structure is greater than 1000 mm 2 .
15. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein the material of the electromagnetic-radiation-reflecting structure has a conductivity less than 100 S/m, a relative permeability between 100 and 10 5 , and a relative permittivity between 1 and 14.
16. The electromagnetic-radiation-reflecting structure as recited in claim 1 , wherein the material of the electromagnetic-radiation-reflecting structure has a conductivity less than 100 S/m, a relative permeability between 1 and 100, and a relative permittivity between 7 and 14.