Multilayer PCB Built on RO4350b with Blind Via From Top to Inner Layer

Brief Introduction
RO4350B High Frequency Circuit Material is glass reinforced hydrocarbon/ceramic laminates
(Not PTFE) designed for performance sensitive, high volume commercial applications. Currently
double sided and multilayer RO4350B PCB's are available at Bicheng company. Double sided
RO4350B PCB with thickness 10mil (0.254mm), 20mil (0.508mm), 30mil (0.762mm) and 60mil
(1.524mm) are the bestsellers. We provide prototype runs, small batches and volume production
services.

Advantages
1) Excellent high frequency performance due to low dielectric tolerance and loss;
2) Excellent dimensional stability.
3) Low thermal coefficient of dielectric constant;
4) Low Z-Axis expansion;
5) Low in-plane expansion coefficient;
6) Stable electrical properties verus frequency;

Applications
1) Attenuator, Automatic gate induction;
2) LNB's for direct broadcast satellites;
3) Microstrip antenna, spread spectrum;
4) Microstrip and cellular base station antennas and power amplifiers;
5) RF identifications tags
6) Spread spectrum communications systems
7) Trunk amplifier, splitter module etc.


PCB Case: Multilayer PCB Built On RO4350B With Blind
Via from Top to Inner Layer
(PCB's are custom-made products, the picture and parameters shown are just for reference)


General Description
This is a type of 4 layer HDI high frequency multilayer PCB built on RO4350B with RO4450B
prepreg for the application of radar RF board. It's 1.0 mm thick with white silkscreen (Taiyo)
on green solder mask (Taiyo) and immersion gold on pads. This board contains blind via from
top layer to inner 1, top layer to inner 3. Since it's asymmetric buildup,1.2% warpage is allowed.
It's fabricated per IPC 6012 Class 2 using supplied Gerber data. Each 25 boards are packed
for shipment. 


Features and benefits
The temperature coefficient of dielectric constant is among the lowest of any circuit board material,
making it ideal for temperature sensitive applications.
Reducing signal loss in high frequency application meets the development needs of communication
technology.
Excellent high frequency performance due to low dielectric tolerance and loss.
Gold has high solderability, no stressing of circuit boards and less contamination of PCB surface.
Engineering design prevents problems from occurring in pre-production. 
100% tests inclusive of electrical test and AOI inspection.
Fast and flexible to save the time of production from prototype to standard production
Great customer service
UL recognized and RoHS Directive-compliant
    

Application
RF module, Power splitter, Low Noise Block, 3G antenna


Parameter and data sheet

Quality Policy
Bicheng has developed series of management procedures and approaches to assure that PCBs
are in compliance with the customers' requirements, inclusive of selection of the vendors, work in
progress (WIP) inspection, outgoing delivery inspection and customer service etc.
  
Evaluation and Audit of Suppliers 
Suppliers have to be evaluated by Bicheng. In addition, Bicheng will appraise and rank suppliers
every year to guarantee the materials supplied are meeting Bicheng's requirements. Furthermore,
Bicheng continuously develop suppliers and supervise them to improve their quality and
environment management basing on the systems of ISO9001 & ISO14001. 

Contract Evaluation 
Bicheng shall review and verify customer's requirements to make sure that we have the capability
to satisfy customers' requirements including specifications, delivery and other demands prior to
accepting an order.

Making, audit and control of manufacturing data
When customers' design data and specifications are provided to our market department, Bicheng
has to verify all the requirements. Then, convert the design data into manufacturing data by CAM.
Finally, a manufacturing instruction (MI) is generated according to the real manufacturing process
and technologies for manufacturing department as the basis for actual fabrication. MI must be
reviewed by independent engineers and QA engineers before issue.

Incoming Material Quality Control
All materials have to be inspected before warehousing. We established a series of strict inspection
procedure and instruction to control the incoming materials. Furthermore, various precise inspecting
instruments and apparatus guarantee the capability to judge the material good or not. We issue
material with first in first out principle, and give out "alarm" for the material that will reach the shelf
life to ensure the materials are used up before expiry.

Control of Production Process
Right manufacturing instruction (MI), comprehensive equipment management and maintenance and
process control, strict WIP inspection and monitoring as well as working instruction, all those make
the whole fabrication process totally controlled. 

Final Control and Inspection 
All PCBs have to be gone through the open and short test as well as visual inspection after passed
the specified physical tests. We own various advanced test equipment including customized, probe
flying test machines to guarantee that each PCB is 100% tested.

Product Delivery Audit
We set up a dedicated FQA department to inspect the PCB products according to the customer's
specifications and requirements by sampling. Qualified PCBs are going to be packed. 

FQA also has to carry out a 100% audit of the warehouse packing and shipping products, including
product number, customer number, product quantity, shipping address and so on prior to shipment.

Customer Service
We sets up a professional customer service team to proactively communicate with customers and
timely deal with the customers' feedbacks. We highly focus on customers' needs and to understand
customers' demands, timely to adjust the policy of customer service and PCB product requirements.


Variety of PCBs

Peeling strength tester