4 Layer High Frequency PCB On 6.6 Mil RO4350B and 10 Mil RO4350B for Radar System
(Printed circuit boards are custom-made products, the picture and parameters shown are just for reference)
Hi Everyone,
Multilayer high frequency PCBs are made from all high frequency material inclusive of prepreg adhesive. For example, a 4-layer RO4350B PCB is a compound of 2 cores of RO4350B substrates. 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 talked is a 4-layer RO4350B high frequency PCB built on 6.6mil and 10mil RO4350B substrate for the application of radar system. This RF board has a thickness of 0.82mm with a minimum 4mil track and 5mil gap. This is a pure high frequency multilayer PCB with RO4450B as dielectric prepreg. Other specifications are white silkscreen over green solder mask, immersion gold plated on pads. Entire board is supplied 1 up per panel. They're fabricated per IPC 6012 Class 2 using supplied Gerber data. Each 50 panels are packed for shipment. Here’s detail of stack-up:
Features and benefits
1) Excellent high frequency performance due to low dielectric tolerance and loss;
2) Good high temperature and low temperature resistance(-192℃-260℃);
3) Eligible products rate of first production: >95%
4) Delivery on time: >98%
5) Customer complaint rate: <1%
Applications
Modular oscilloscope, Vario-coupler, Tower-mounted booster, Power amplifier
Splitter, Acoustic detection sensors, RF Switches, Trunk amplifier
Parameter and data sheet
| PCB SIZE | 85 x 100mm=1PCS |
| BOARD TYPE | Multilayer PCB |
| Number of Layers | 4 Layers |
| Surface Mount Components | YES |
| Through Hole Components | No |
| LAYER STACKUP | Copper ------- 35um(1 oz)+plate TOP layer |
| Dielectric RO4350B 0.168mm (6.6 mil) |
| Copper ------- 35um(1oz) |
| | Dielectric RO4350F 0.203mm (8 mil) |
| | Copper ------ 35um (1oz) |
| | Dielectric RO4450B 0.254mm ( 10 mil) |
| | Copper ------35um (1oz) + plate Bottom Layer |
| TECHNOLOGY | |
| Minimum Trace and Space: | 4 mil / 5 mil |
| Minimum / Maximum Holes: | 0.25 mm / 2.0 mm |
| Number of Different Holes: | 5 |
| Number of Drill Holes: | 175 |
| Number of Milled Slots: | 0 |
| Number of Internal Cutouts: | 3 |
| Impedance Control: | no |
| Number of Gold finger: | 0 |
| BOARD MATERIAL | |
| Glass Epoxy: | RO4350B Tg280℃, er<3.48, Rogers Corp. |
| Final foil external: | 1.5 oz |
| Final foil internal: | 1 oz |
| Final height of PCB: | 0.82 mm ±0.1mm |
| 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 0.25mm. |
| 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. |
