HIGH ISOLATION BETWEEN TRANSMIT AND RECEIVE ANTENNA IN FMCW RADARS

    公开(公告)号:US20230314557A1

    公开(公告)日:2023-10-05

    申请号:US17813625

    申请日:2022-07-20

    Inventor: Rajesh Chivukula

    CPC classification number: G01S7/025 G01S7/038 G01S13/003

    Abstract: A frequency modulated continuous wave (FMCW) radar antenna that may provide isolation between the transmit (Tx) antenna and the receive (Rx) antenna based on the arrangement of the transmit elements and the receive elements. The transmit antenna elements for the antenna of this disclosure may be orthogonally fed, e.g., different by 90 degrees, compared to the receive antenna elements. For example, for horizontally polarized receive antenna elements, the transmit elements may be vertically polarized, or vice versa. The cross-polarized antenna elements may cause attenuation of surface waves between the Tx and Rx antennae. A low insertion loss 90-degree polarizer layer over one of the transmitter antenna, or the receiver antenna, to convert either the transmitted signals or the received reflections by 90-degrees so the reflected signal matches the polarization of the receiver antenna.

    Dual band phased array antenna structure and configurations therefor

    公开(公告)号:US11476578B2

    公开(公告)日:2022-10-18

    申请号:US17091353

    申请日:2020-11-06

    Inventor: Rajesh Chivukula

    Abstract: Disclosed is a dual band antenna with a first radiating element oriented at a first predetermined angle that operates in a first frequency band and a second radiating element oriented at a second predetermined angle that operates in a second frequency band. The dual band antenna has a ground plane that has a first slot that is associated with the first radiating element and a second slot that is associated with the second radiating element. The dual band antenna also has a first feed probe that is associated with the first radiating element and a second feed probe that is associated with the second radiating element.

    Fixing structure to enhance the mechanical reliability of plate slot array antenna based on SIW technology

    公开(公告)号:US10903581B2

    公开(公告)日:2021-01-26

    申请号:US16453902

    申请日:2019-06-26

    Abstract: This disclosure is directed to techniques to improve the mechanical reliability and strength of slot array antennae created using printed circuit board (PCB) technology. In some examples, a multi-layer PCB may have a limit on the length and width dimensions. Therefore, a larger slot array antenna may require two or more PCBs to create the full size of the antenna. This disclosure describes techniques to securely connect the two or more PCBs to withstand environments where the slot array antenna may be placed under mechanical stress, such as vibration. A PCB based antenna may define the walls of radiating waveguides with vias between the layers of the PCB. Mechanical fasteners may pass through some of the existing vias to secure the PCB to a support structure, such as a feeding waveguide, as well as to secure one PCB to other PCBs.

    High isolation between transmit and receive antenna in FMCW radars

    公开(公告)号:US12210115B2

    公开(公告)日:2025-01-28

    申请号:US17813625

    申请日:2022-07-20

    Inventor: Rajesh Chivukula

    Abstract: A frequency modulated continuous wave (FMCW) radar antenna that may provide isolation between the transmit (Tx) antenna and the receive (Rx) antenna based on the arrangement of the transmit elements and the receive elements. The transmit antenna elements for the antenna of this disclosure may be orthogonally fed, e.g., different by 90 degrees, compared to the receive antenna elements. For example, for horizontally polarized receive antenna elements, the transmit elements may be vertically polarized, or vice versa. The cross-polarized antenna elements may cause attenuation of surface waves between the Tx and Rx antennae. A low insertion loss 90-degree polarizer layer over one of the transmitter antenna, or the receiver antenna, to convert either the transmitted signals or the received reflections by 90-degrees so the reflected signal matches the polarization of the receiver antenna.

    COMPACT, HYBRID, LOW-COST HIGH-RESOLUTION DUAL-MODE PHASED ARRAY ANTENNA

    公开(公告)号:US20250030161A1

    公开(公告)日:2025-01-23

    申请号:US18637373

    申请日:2024-04-16

    Abstract: An antenna apparatus and a method of operating the antenna apparatus can include a group of receive antenna elements and a transmit antenna array comprising transmit antenna elements, wherein the transmit antenna array is located centrally in a phased array aperture that includes the transmit array antenna and the plurality of receive antenna elements. An isolation area can isolate the transmit antenna array from the receive antenna elements in the phased array aperture, and the phased array aperture can operate with a hybrid dual mode comprising a radar mode and an active beaming steering mode. The radar mode can be a multiple input multiple output (MIMO) radar mode, and the beamforming mode can be an antenna beamforming mode.

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