Just as its name implies, high frequency is that the frequency is relatively high, generally refers to the frequency of >=300 MHz (i.e. wave length <=1m), that is, the usual radio frequency band. The electromagnetic wave of frequency >=1GHz is called microwave.
Typical frequencies for wireless applications:
* Current mobile: 0.9GHz - 2GHz
* 3G systems: 2.5GHz
* Bluetooth: 2.5GHz
* GPS: 12.6GHz
* LMDS: 24GHz and 40GHz
* Automotive: 77GHz
Market: RFID, Wireless communications, base station and antenna, amplifier, military products, consumer electronics.
High frequency printed circuit board or microwave PCB refers to the printed circuit board made on the high frequency (microwave) substrate copper clad plate. The common types are: Double-sided board, multilayer board and mixed structure.
Mixed structure includes high performance special substrate, PP sheet + ordinary performance board and PP sheet mixed pressing board; high frequency substrate + ordinary FR4 substrate; high frequency substrate + metal base etc.
PCB Case: High Frequency PCB On 30 mil RO4350B With Double Layers
(Printed circuit boards are custom-made products, the picture and parameters shown are just for reference)
This is a type of double sided PCB built on high frequency substrate with Tg 288°C for the application of Phone Signal Booster. It's 0.8 mm thick, white silkscreen over green solder mask. All via's are open to air. Pads are plated by immersion gold. The base material is used from Rogers RO4350B, entire board supplying 1 PCB up. They're fabricated per IPC 6012 Class 2 using supplied Gerber data. Each 25 panels are packed for shipment.
Features and benefits
Stable electrical properties verus frequency;
Low thermal coefficient of dielectric constant;
Low Z-Axis expansion;
Low in-plane expansion coefficient;
Excellent dimensional stability;
Comprehensive equipment management and maintenance and process control;
Strict WIP inspection and monitoring as well as working instruction;
More than 15 years of experience;
TV antenna, antenna combiner, balanced amplifier, multi-coupler
Parameter and data sheet
||54 x 55mm=1PCS
||Double sided PCB
|Number of Layers
|Surface Mount Components
|Through Hole Components
||copper ------- 35um(1 oz)+plate TOP layer
|copper ------- 35um(1oz) + plate BOT Layer
|Minimum Trace and Space:
||4.8 mil / 4.5 mil
|Minimum / Maximum Holes:
||0.3 mm / 4.6 mm
|Number of Different Holes:
|Number of Drill Holes:
|Number of Milled Slots:
|Number of Internal Cutouts:
|Number of Gold finger:
||RO4350B Tg280℃, er<3.48, Rogers Corp.
|Final foil external:
|Final foil internal:
|Final height of PCB:
||0.8 mm ±10%
|PLATING AND COATING
|Solder Mask Apply To:
||TOP, 12micron Minimum
|Solder Mask Color:
||Green, PSR-2000GT600D, Taiyo Supplied.
|Solder Mask Type:
|Side of Component Legend
|Colour of Component Legend
||White, IJR-4000 MW300, Taiyo brand
|Manufacturer Name or Logo:
||Marked on the board in a conductor and leged FREE AREA
||Plated through hole(PTH), minimum size 0.3mm. Solder mask uncovered
||UL 94-V0 Approval MIN.
||100% Electrical Test prior shipment
|TYPE OF ARTWORK TO BE SUPPLIED
||email file, Gerber RS-274-X, PCBDOC etc
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.
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.
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.