Flexible circuit board superior
in a high-speed transmission performance
Sumitomo Electric Industries’ FLUOROCUIT™ is a flexible circuit board (FPC) of the Fluororesin that a low transmission loss in the millimeter wave band and flexible which utilization is expected of the by 5G communication. Fluororesin has gained popularity have an extremely superior characteristic as a circuit board material in a high-frequency band. Sumitomo Electric Industries group has created various products and work on Fluororesin manufacturing for a long time. In making use of the accumulated knowledge and processing technique, we realized the mass production of the fluororesin flexible circuit board which it had been said to that processing was difficult until now. Also, it’s suitable for the utilized in the cable part that flexibility is needed because feature of FPC is superior flexibility.
By using low dielectric constant/low dielectric loss tangent fluororesin materials, we can achieve low transmission loss FPCs at high frequencies.
In the frequency band of 5G millimeter wave and automotive radar, comparing the insertion loss with FPCs using other companies' materials, the transmission loss of our FLUOROCUIT™ (fluoropolymer FPC) is reduced.
@10GHz, tested by Cylinder cavity
The use of fluororesin as a dielectric reduces high-frequency loss, which is easily attenuated and diffused during transmission.
The thickness of the 3-layer FPC is 300-400um. If multiple coaxial cables are replaced with FPC, they can be combined into 1pcs.
In terms of space, it`s about 80% thinner and 20% narrower in pitch than AWG34 coaxial cable.
Replace bundled cables with one FPC for saving space and easy handling
※ This comparison is for reference only
A fluororesin substrate and a liquid crystal polymer (LCP) substrate were made with almost the same dimensions, and a 2×2 antenna array was formed. When the antenna characteristics were measured using the general relative gain measurement method (only the patch size was fine-tuned to match the dielectric constant), it was found that the antenna performance was 1.5 times higher than that of the liquid crystal polymer (LCP). Contact
High frequency RF signal relay from modem of the mainboard to antenna module
Relay of high-speed transmission signal between main-boad and sub-boad due to speeding up external terminal signal
Convert the antenna layer to fluorine FPC that low loss and antenna gain are required to improve antenna performance.