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

1.Product Overview

This hybrid 4-layer PCB combines Rogers RO4350B high-frequency material with S1000-2M High Tg FR-4 substrate, delivering optimal RF performance and mechanical stability. The stackup features a 10mil RO4350B core for critical signal layers and 31.5mil FR-4 base, providing excellent dielectric constant control (3.48±0.05) while maintaining cost-effectiveness for commercial aerospace and millimeter-wave applications.

2.Key Material Properties

RO4350B Characteristics

Dielectric Constant: 3.48±0.05 @10GHz
Low Loss Tangent: 0.0037 @10GHz
Thermal Conductivity: 0.69 W/mK
CTE Matched to Copper: 10/12/32 ppm/°C
High Tg: >280°C
Moisture Resistance: 0.06% absorption

S1000-2M FR-4 Features

Tg 180°C (DSC method)
UV Blocking/AOI Compatible
Excellent Anti-CAF Performance
Lead-Free Process Compatible

3.PCB Construction Details

4.PCB Stackup:

Copper_layer_1 - 35 μm
RO4350B - 0.254 mm (10mil)
Copper_layer_2 - 35 μm
Prepreg - 1080 RC63% +7628 (43%) -0.254mm (10mil)
Copper_layer_3 - 35 μm
S1000-2M - 0.8 mm (31.5mil)
Copper_layer_4 - 35 μm

5.Board Statistics

Components: 52
Total Pads: 247
Thru Hole Pads: 117
Top SMT Pads: 98
Bottom SMT Pads: 32
Vias: 78
Nets: 12

6.Manufacturing & Quality Standards

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

7.Technical Advantages

Hybrid Design: Combines RF performance with structural rigidity
Thermal Stability: Withstands lead-free reflow processes
Manufacturing Efficiency: Standard FR-4 processing compatible
Signal Integrity: Tight impedance control (±0.05 Dk)

8.Target Applications

Commercial Airline Broadband Antennas
Microstrip and Stripline Circuits
Millimeter Wave Applications
Radar Systems
Guidance Systems
Point to Point Digital Radio Antennas