IWR1443BOOST: What's the main reason for choosing RO4835 RF PCB material?

Rand SL

Part Number: IWR1443BOOST

Hi,

Rogers RO4830 datasheet specifically mention 76 - 81 GHz (https://www.rogerscorp.com/acs/products/1100/RO4830-Laminates.aspx) frequency band for mmWave designs.

According to datasheet of RO4835, they've given design parameters up to 40 GHz and according to my understanding, RO4835 gets much higher losses above 40 GHz than RO4830 material.

Is there any specific reason for choosing RO4835 PCB material for the IWR1443BOOST design other than cost difference of the two materials ?

What's the main reason for selecting the RO4835 PCB for the RF component layer (top layer) and not using a material such as RO4830?

Is it something related to durability, assembly, loading issues, manufacturing issues etc.?

Cheers,
Rand

over 8 years ago

0 Vaibhav Mahimkar over 8 years ago

TI__Mastermind 23725 points

Hello Rand,

Cost is definitely one of the factors taken into account while deciding the material.

There are multiple vendors and materials that can give better losses compared to RO4835 and based on cost vs performance RO4835 was selected.

Please see identical question covered in ticket below:

substrate selection of AWR1642 for 77GHz Radar

Thank you,

Vaibhav

0 Rand SL over 8 years ago in reply to Vaibhav Mahimkar

Prodigy 50 points

Thanks Vaibhav for the prompt reply.

Can you please give a figure for the amount of loss (dB/inch) of the Tx, Rx tracks on RO4850 substrate at this freq. band 76 - 81 GHz?
At least a simulated value would be useful if a measurement has not been done.

Cheers,
Rand

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IWR1443BOOST: What's the main reason for choosing RO4835 RF PCB material?

substrate selection of AWR1642 for 77GHz Radar