4 Layer High Frequency PCB Built On 6.6mil and 20mil RO4350B with Blind Via for Radar Sensor
(Printed circuit boards are custom-made products, the picture and
parameters shown are just for reference)
Multilayer Rogers PCBs are made based on several core combined,
which are different from FR-4 multilayer PCBs. As is known to all,
there’re 8 cores in RO4350B family, i.e. 4mil (0.101mm) to 60mil
(1.524mm).
| RO4350B |
| 4mil | 0.101mm |
| 6.6mil | 0.168mm |
| 10mil | 0.254mm |
| 13.3mil | 0.338mm |
| 16.6mil | 0.422mm |
| 20mil | 0.508mm |
| 30mil | 0.762mm |
| 60mil | 1.524mm |
So it’s very interesting that stack-up of 4 layers can be done in
many different ways.
Today, we are going to introduce Rogers 4-layer PCBs built on
6.6mil and 20mil RO4350B.
Let’s see first one and stack-up is shown first.
Layer 1 to layer 2 is the first core of 6.6mil, layer 3 to layer 4
is the second core of 20mil, they are combined through 2 sheet of
RO4450F (1 RO4450F=4mil). This board is used for radar sensor,
1.0mm thick, pads with immersion gold. It contains blind via from
top layer to inner 1. Since it's asymmetric buildup, 1.2% warpage
is allowed. It's fabricated per IPC 6012 Class 2 using supplied
Gerber data. Each 10 boards are packed for shipment.
The second one is very similar to previous one, the stack-up
explains all.
Features and benefits
1) The dielectric constant (DK) is low and stable, so the signal
transmission is good without delay.
2) Immersion gold has excellent surface planarity, particularly
helpful for PCBs with BGA packages or even CSP mounted components
to reduce failure rate during assembly and soldering.
3) 100% tests inclusive of electrical test and AOI inspection,
thermal stress test, reliability test, insulation resistance test
and ionic contamination test,
4) Fast and flexible to save the time of production from prototype
to standard production
5) UL recognized and RoHS Directive-compliant
Applications
TV antenna, Transmitter combiner, Sound control switch induction,
Tower Mounted Amplifier, RF module, Power splitter, Low Noise
Block, 4G antenna
| PCB SIZE | 70mm x 125mm = 1 piece |
| BOARD TYPE | Multlayer PCB |
| Number of Layers | 4 Layers |
| Surface Mount Components | YES |
| Through Hole Components | YES |
| LAYER STACKUP | Copper -----Signal 18um(0.5 oz)+plate TOP layer |
| RO4350B 0.508 mm |
| Copper -----Plain 0.018 mm |
| Prepreg RO4450F X 3, 0.305mm |
| Copper ----- Plain 0.018 mm |
| RO4350B 0.508 mm |
| Copper ------- 18um(0.5oz) + plate BOT Layer |
| TECHNOLOGY | |
| Minimum Trace and Space: | 4 mil / 5 mil |
| Minimum / Maximum Holes: | 0.4 mm / 5.6 mm |
| Number of Different Holes: | 12 |
| Number of Drill Holes: | 121 |
| Number of Milled Slots: | 0 |
| Number of Internal Cutouts: | NA |
| Impedance Control: | N/A |
| Number of Gold finger: | N/A |
| BOARD MATERIAL | |
| Base Material: | RO4350B Tg280℃, er<3.48, Rogers Corp. |
| Final foil external: | 1 oz |
| Final foil internal: | 0.5 oz |
| Final height of PCB: | 1.42 mm ±10% |
| PLATING AND COATING | |
| Surface Finish | Immersion gold |
| Solder Mask Apply To: | N/A |
| Solder Mask Color: | N/A |
| Solder Mask Type: | N/A |
| CONTOUR/CUTTING | Routing |
| MARKING | |
| Side of Component Legend | N/A |
| Colour of Component Legend | N/A |
| Manufacturer Name or Logo: | N/A |
| VIA | Plated through hole(PTH), minimum size 0.4mm. |
| FLAMIBILITY RATING | UL 94-V0 Approval MIN. |
| DIMENSION TOLERANCE | |
| Outline dimension: | 0.0059" |
| Board plating: | 0.0029" |
| Drill tolerance: | 0.002" |
| TEST | 100% Electrical Test prior shipment |
| TYPE OF ARTWORK TO BE SUPPLIED | email file, Gerber RS-274-X, PCBDOC etc |
| SERVICE AREA | Worldwide, Globally. |
