21 June 2019 1 9K Report

Here I am gonna ask a really stupid question, but I don't accept stupid answers.

These days, I got chances to "play" with some automotive radar PCB (not assembled one, I do not have the chip's information), but I wanna know what is what on the PCB.

Normally I take the most array number one is LRR Tx, since higher the gain longer the range, then take next to him as SRR Tx, since they are from the same area (chip area, transmitter?), then take others as receivers, usually four of them.

But on some boards, they are all from the same transceiver area.

My question is that 1. normally how many LRR Tx, SRR Tx and how many receiving antennas on the board?

My another question is that 2. I heard 76-77GHz is for LRR-Tx, 77-81GHz is for SRR-Tx. Is it correct? and the Rx is 76-81? why don't we use LRR-Rx (76-77GHz), and SRR-Rx (77-81GHz) separately?

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