US 12,169,150 B2
Rotational and linear parameter measurements using a quadrature continuous wave radar with millimeter wave metamaterials and frequency multiplexing in metamaterial-based sensors
Alexander Schossmann, Graz (AT); Alexander Bergmann, Graz (AT); Dirk Hammerschmidt, Finkenstein (AT); and Christof Michenthaler, Feistritz/Gail (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Aug. 24, 2023, as Appl. No. 18/454,834.
Application 18/454,834 is a continuation of application No. 17/518,912, filed on Nov. 4, 2021, granted, now 11,788,910.
Prior Publication US 2023/0400372 A1, Dec. 14, 2023
Int. Cl. G01L 5/22 (2006.01); B62D 6/10 (2006.01); G01D 5/14 (2006.01); H04W 4/38 (2018.01)
CPC G01L 5/221 (2013.01) [B62D 6/10 (2013.01); G01D 5/145 (2013.01); H04W 4/38 (2018.02)] 21 Claims
OG exemplary drawing
 
1. A rotation sensor system, comprising:
a rotational shaft configured to rotate about a rotational axis;
a first array of millimeter-wave (mm-wave) structures mechanically coupled to the rotational shaft, wherein the first array of mm-wave structures is arranged at least partially around the rotational axis, and wherein the first array of mm-wave structures has a first working resonance frequency;
a second array of mm-wave structures mechanically coupled to the rotational shaft, wherein the second array of mm-wave structures is arranged at least partially around the rotational axis, and wherein the second array of mm-wave structures has a second working resonance frequency that is different from the first working resonance frequency;
at least one transmitter configured to transmit a first electro-magnetic transmit signal towards the first array of mm-wave structures and transmit a second electro-magnetic transmit signal towards the second array of mm-wave structures,
wherein the first array of mm-wave structures is configured to convert the first electro-magnetic transmit signal into a first electro-magnetic receive signal, and
wherein the second array of mm-wave structures is configured to convert the second electro-magnetic transmit signal into a second electro-magnetic receive signal; and
at least one receiver configured to receive the first electro-magnetic receive signal and the second electro-magnetic receive signal, determine a first rotational parameter of the rotational shaft based on the first electro-magnetic receive signal, and determine a second rotational parameter of the rotational shaft based on the second electro-magnetic receive signal, wherein the first rotational parameter and the second rotational parameter are different rotational parameters.