Other Parts Discussed in Thread: AWR6843
Hi Ti team ,
We are planning to design a new board at our company using the evaluation board as a reference.(IWR6843ISK)
I plan to use the antenna pattern of the evaluation board for the wireless part of the AWR6843.
We are thinking of changing to other materials when we manufacture substrates in Japan because RO4835 and PCL370HR are not available.
However, since the antenna part is for 60GHz signals, I am worried that the slight difference in dielectric constant and dielectric loss tangent may affect the radio characteristics.
Therefore, we are considering alternatives for the substrate material.
(We are planning to copy the layout of the evaluation board for the antenna pattern of the 60GHz RF part.)
If I change the board material in Alternatives 1, 2, and 3 in the table, will it work without problems?
Please let us know if you have any advice on design or evaluation of possible problems with wireless characteristics.
Or, if you have any information about the problems you encountered when you changed the board material while referring to the evaluation board, please let me know.
| IWR6843ISK(TI) | My alternative proposal 1 | My alternative proposal 2 | My alternative proposal 3 | |
| Number of layers | 8 layers IVH(2+6) | 8 layers IVH(2+6) | 8 layers IVH(2+6) | 8 layers IVH(2+6) |
| Material (L1-L2) | RO4835_LOPRO (ROGERS) |
MEGTRON7 (Panasonic) |
MEGTRON7 (Panasonic) |
MEGTRON7 (Panasonic) |
| Material (L3-L8) | PCL37OHR (isola) |
MEGTRON7 (Panasonic) |
R-1566 (Panasonic) |
R-1755S (Panasonic) |
| Thickness | 1.6mm | 1.6mm | 1.6mm | 1.6mm |
| Surface treatment | Silver or Tin | Electroless Ni+Au flash | Electroless Ni+Au flash | Electroless Ni+Au flash |
| impedance control | 50Ω, 100Ω | 50Ω, 100Ω | 50Ω, 100Ω | 50Ω, 100Ω |
The board specifications of the IWR6843ISK evaluation board are based on the following documents. "swrc355c.zip PROC073D_FabNotes.PDF"
For the specifications of the boards, I referred to the materials on the websites of the manufacturers.
RO4835(ROGERS)
https://rogerscorp.com/advanced-electronics-solutions/ro4000-series-laminates/ro4835-laminates
PCL370HR(isola)
https://www.isola-group.com/pcb-laminates-prepreg/370hr-laminate-prepreg/
MEGTRON7(Panasonic)
https://industrial.panasonic.com/ww/products/pt/megtron
R-1566(Panasonic)
https://industrial.panasonic.com/ww/products/pt/halogen-free/hfreer1566
R-1755S(Panasonic) *The R-1755S is a link in Japanese because I could only find it for Japan.
https://industrial.panasonic.com/content/data/EM/PDF/cbmcatalog_1906_r1755s.pdf
