US 12,080,944 B2
Isolation between antennas using electromagnetic polarizers
Uriel Z. Odes, Givaat Shmuel (IL)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Nov. 7, 2022, as Appl. No. 17/981,991.
Prior Publication US 2024/0154304 A1, May 9, 2024
Int. Cl. H01Q 1/52 (2006.01); H01Q 15/24 (2006.01)
CPC H01Q 1/525 (2013.01) [H01Q 15/242 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An antenna system comprising:
a first antenna operational to transmit a first radio-frequency signal with a first polarization;
a second antenna operational to receive a second radio-frequency signal with the first polarization and receive the first radio-frequency signal, wherein the first radio-frequency signal would disrupt conversion of the second radio-frequency signal to a useable form if the first radio-frequency signal is received unattenuated at the second antenna;
a first electromagnetic polarizer disposed between the first antenna and the second antenna and operational change the first polarization of the first radio-frequency signal to a second polarization, wherein the second polarization is offset relative to the first polarization by a first predetermined angle;
a second electromagnetic polarizer disposed between the first electromagnetic polarizer and the second antenna and operational change the second polarization of the first radio-frequency signal to a third polarization, wherein the third polarization is offset relative to the first polarization by a second predetermined angle, and the first electromagnetic polarizer and the second electromagnetic polarizer attenuate the first radio-frequency signal at the second antenna so that the second radio-frequency signal is convertible to the useable form; and
a conductive ground plane disposed on a ground side of the first antenna and the second antenna, wherein the conductive ground plane defines a gap between the first antenna and the second antenna, the gap extends under the first electromagnetic polarizer, the gap extends under the second electromagnetic polarizer, and a horizontal component of the second polarization of the first radio-frequency signal is maintained across the gap.