IWR6843AOPEVM: Antenna Overlay

John Blackburn1

Prodigy 50 points

Part Number: IWR6843AOPEVM

Re: The overlay material used to cover the RF antenna

What is the material used to cover the RX and TX antennas and what is its purpose ?

over 5 years ago

0 CHETHAN KUMAR Y.B. over 5 years ago

TI__Mastermind 25835 points

John,

Could you please provide more information on the request, are you looking for information on radomes to cover TX and RX ?

Or something else? Could you please show with picture?

Thanks and regards,

CHETHAN KUMAR Y.B.

0 John Blackburn1 over 5 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 50 points

The area shown by the red ellipse is coated in a white material directly on the PCB. What is the material ? and what is its purpose.

Many Thanks

0 CHETHAN KUMAR Y.B. over 5 years ago in reply to John Blackburn1

TI__Mastermind 25835 points

Hello,

On the area you have highlighted: Copper is etched out hence what you would see white material is Rogers (RO4835LOPRO) substrate.

On the other regions where copper is not etched, you would see silver color on the traces and antenna, This is due to plating.Most common plating used in industry, Electroless Nickel-Immersion Gold (ENIG), is not a good choice for mmWave boards due to its high losses. TI EVM uses immersion silver plating that has lesser loss, comparatively.

For more details on this you could refer to the below app-note

http://www.ti.com/lit/an/spracg5/spracg5.pdf

Thanks and regards,

CHETHAN KUMAR Y.B.

0 John Blackburn1 over 5 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 50 points

Thank you for your clear reply.

A misunderstanding on my part.

Kind Regards

John Blackburn

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IWR6843AOPEVM: Antenna Overlay