6-Layer Hybrid PCB with RO4350B and High Tg FR-4 for RF Applications

1.Product Introduction: Advanced Hybrid PCB Technology

This innovative 6-layer hybrid PCB combines Rogers RO4350B high-frequency material with standard High Tg FR-4 (Tg170°C) in an optimized stackup, delivering superior RF performance while maintaining cost efficiency. The hybrid construction strategically places RO4350B (Dk=3.48±0.05) in critical signal layers for optimal high-frequency response, while utilizing cost-effective FR-4 for structural support and power distribution. This approach provides the perfect balance between RF performance, thermal reliability, and manufacturing economics for modern wireless systems.

2.Key Material Properties

RO4350B Characteristics

Dielectric Constant: 3.48±0.05 @10GHz
Ultra-Low Loss: 0.0037 dissipation factor @10GHz
Thermal Stability: 32 ppm/°C Z-axis CTE
Process Compatibility: Standard FR-4 fabrication
Flame Rating: UL 94 V-0 certified

High Tg FR-4 Features

High Temp Resistance: Tg≥170°C
Mechanical Strength: Excellent multilayer compatibility
Cost Efficiency: Traditional epoxy/fiberglass benefits
Lead-Free Compatible: Withstands high-temp soldering

3.PCB Construction Specifications

4.PCB Stackup:

Copper layer 1 - 35 μm
RO4350B - 0.422 mm (16.6mil)
Copper layer 2 - 35 μm
Prepreg - 0.102mm
Copper layer 3 - 35 μm
Tg170°C FR-4 - 0.254mm
Copper layer 4 - 35 μm
PrePreg - 0.002mm
Copper layer 5 - 35 μm
Tg170°C FR-4 - 0.508mm
Copper layer 6 - 35 μm

5.Board Statistics

Components: 77
Total Pads: 276
Thru Hole Pads: 178
Top SMT Pads: 86
Bottom SMT Pads: 12
Vias: 213
Nets: 11

6.Manufacturing & Quality Standards

Artwork Format: Gerber RS-274-X
Quality Standard: IPC-Class 2
Availability: Worldwide shipping

7.Technical Advantages

Performance Optimization: RO4350B for critical RF paths, FR-4 for power/cost
Thermal Reliability: Withstands lead-free reflow processes
Impedance Control: ±0.05 Dk tolerance in RF sections
Manufacturing Efficiency: Standard FR-4 processes throughout

8.Target Applications

Cellular Base Station Antennas and Power Amplifiers
RF Identification Tags
Automotive Radar and Sensors
LNB's for Direct Broadcast Satellites