4-Layer Wangling WL-CT338 + FR4 Hybrid PCB ENIG Green Solder Mask White Silkscreen

4-Layer Wangling WL-CT338 + FR4 Hybrid PCB ENIG Green Solder Mask White Silkscreen

Product Overview

This 4-layer hybrid rigid PCB integrates domestic high-frequency hydrocarbon-ceramic CCL WL-CT338 and high-Tg 170℃ FR4 core materials, targeted for mixed-signal RF-digital integrated equipment including satellite communication modules, airborne radar front-end circuits, phase array antenna control boards, and microwave power amplifier substrates.

Different from full high-frequency laminates or pure FR4 PCBs, thishybrid stackup separates high-frequency RF signal routing layers and low-frequency power/ground digital layers via material zoning: Wangling WL-CT338 handles microwave transmission paths to minimize insertion loss and passive intermodulation (PIM), while TG170 FR4 undertakes power distribution, ground reference planes and digital logic circuits to control overall manufacturing cost without sacrificing high-frequency electrical performance.

The finished board adopts immersion gold (ENIG) surface finish, full green solder mask with double-sided white silkscreen, symmetrical copper weight design (1oz outer, 0.5oz inner), non-blind through-via architecture, and undergoes 100% continuity electrical testing before delivery. All fabrication processes strictly comply with IPC-6012 Class 2 aerospace-grade PCB manufacturing standards, with tightly controlled dimensional tolerance, thermal stability and impedance consistency for mass production consistency.

1. PCB Core Construction Details

The board is manufactured as a 4-layer hybrid assembly integrating high-frequency WL-CT338 hydrocarbon ceramic material with standard FR-4 Tg170℃ substrate, delivering 1.47mm finished thickness with selective copper weighting optimized for signal integrity and power distribution.

2. PCB Symmetrical Hybrid Stackup Structure

This hybrid 4-layer PCB stackup adopts symmetrical compression layout to eliminate warpage risk during high-temperature lamination and reflow soldering;WL-CT338 dielectric layers are arranged on outer signal layers for high-frequency trace routing, while FR4 cores form inner ground and power planes to balance cost and mechanical rigidity.

3. Key Differentiated Technical Advantages of WL-CT338 + FR4 Hybrid PCB

3.1 Balanced High-Frequency Electrical Performance & Cost Control

• Pure WL-CT338 full-stack PCB brings superior low-loss performance but raises material and lamination cost by 35–50% compared with FR4 substrates. This hybrid design restricts WL-CT338 only to outer signal layers carrying microwave signals, while inner ground/power planes adopt standard TG170 FR4. WL-CT338 delivers Dk=3.38 (10GHz typical) and Df=0.0029 (10GHz), effectively cutting insertion loss by over 30% versus pure FR4 (Dk≈4.4, Df>0.012) at frequencies above 10GHz; TG170 FR4 provides stable low-frequency power transmission and continuous ground shielding without extra high-frequency material cost. For batch manufacturing, overall raw material cost is reduced by approximately 28% compared with fullWL-CT338 4-layer boards, maintaining RF signal integrity while improving commercial competitiveness.

3.2 High Thermal Stability Matching for Lead-Free Solder Assembly

• FR4 core with TG=170℃provides baseline thermal resistance for multi-cycle lead-free reflow (peak temperature 260℃). WL-CT338 laminate features ultra-high Tg >280℃and Z-axis thermal conductivity 0.70 W/(M·K), far exceeding standard FR4 heat dissipation capacity. The X/Y CTE of WL-CT338 (14–16 ppm/℃) closely matches copper foil expansion coefficient, minimizing interlayer registration shift and PTH barrel cracking risks during repeated thermal cycling from -55℃to 150℃operating temperature range. No delamination occurs after 3 cycles of 288℃10s solder float test, ensuring long-term reliability for aerospace and outdoor radar equipment with wide temperature fluctuation.

3.3 Immersion Gold (ENIG) Surface Finish Optimized for RF Applications

• Compliant with IPC-4552B specification, immersion gold delivers ultra-flat pad surface without uneven tin thickness defects of HASL finish, critical for precise RF impedance matching and SMT chip assembly. The thin gold top layer prevents copper oxidation, maintains stable contact resistance for long-term storage, and supports gold wire bonding for high-reliability aerospace components. Dual-sided white silkscreen on green solder mask achieves high contrast marking, eliminating identification errors during manual assembly and inspection.

3.4 Zero Blind Via Design & Full Electrical Testing Guarantee

• All interlayer connections use standard through-hole PTH vias, avoiding complex sequential lamination processes required for blind vias, simplifying production workflow and lowering manufacturing failure rate. Every finished PCB undergoes 100% automatic electrical open/short testing via dedicated flying probe fixture before packaging, eliminating defective open-circuit or short-circuit boards delivered to customers, consistent with aerospace electronic zero-failure quality requirements.

4. PCB Conclusion

This 4-layer WL-CT338 + TG170 FR4 hybrid ENIG PCB forms a cost-performance balanced mixed-signal circuit substrate solution that addresses the core pain point of traditional single-material PCBs: pure FR4 suffers excessive high-frequency signal loss while full high-frequency laminates bear high material costs. Through symmetrical hybrid stackup separation of RF and digital power layers, the product retains WL-CT338’s low-loss microwave transmission performance and leverages high-Tg FR4’s mature mechanical processing, thermal stability and cost advantages. Standardized through-via architecture, reliable immersion gold surface treatment and full electrical testing control guarantee consistent mass production quality, making it a universal high-performance substrate for satellite communication, airborne radar, phase array antenna and microwave power amplifier systems.

Supplementary Detailed CCL Knowledge: WL-CT338 Hydrocarbon Ceramic Copper Clad Laminate

1.WL-CT338 Product Introduction

WL-CT338 is a high-performance organic polymer ceramic woven-glass fabric-reinforced copper-clad laminate developed by Taizhou Wangling Insulation Material Factory. This material belongs to the WL-CT series of hydrocarbon ceramic thermoset resin systems engineered to deliver exceptional low-loss dielectric properties while maintaining process compatibility with standard FR-4 manufacturing equipment. The composition features a hydrocarbon resin matrix reinforced with ceramic filler and woven glass fabric, creating a composite material that achieves an optimal balance of electrical performance, thermal stability, and mechanical strength.

The hydrocarbon ceramic resin system offers significant advantages over traditional PTFE-based high-frequency materials, including superior PCB processability, excellent dimensional stability, and consistent material performance across varying environmental conditions. The material's thermoset nature allows for multilayer lamination using conventional pressing cycles, eliminating the specialized handling requirements associated with thermoplastic fluoropolymer alternatives.

2.Key Advantages of WL-CT338

3.Full WL-CT338 Datasheet Technical Parameter Table

This complete datasheet table records all electrical, thermal, mechanical and environmental test indicators of WL-CT338, tested per IPC-TM-650 and GB/T standard methods for reference design simulation and PCB manufacturing verification.

4.WL-CT338 Copper Foil & Dielectric Thickness Specification

4.1 WL-CT338 Dielectric Thickness with ED Copper

4.2 WL-CT338 Dielectric Thickness with RTF Copper

4.3 Available Panel Sizes

5.WL-CT338 Typical Application Fields

• Aerospace & space equipment: On-board satellite modules, cabin avionics, vacuum environment electronic assemblies

• Microwave antenna systems: Phase-controlled array antennas, beam forming networks, passive antenna matching circuits

• Radar electronics: Airborne early warning radar, vehicle-mounted ADAS millimeter wave radar, marine navigation radar

• Satellite communication & positioning: GNSS high-precision navigation receivers, satellite signal transceivers

• High-power RF devices: RF power amplifiers, microwave signal generators, high-frequency filter substrates

6.WL-CT338 CCL Conclusion

WL-CT338 high-frequency copper clad laminate fills the market gap of cost-effective domesticlow-loss microwave substrates, breaking reliance on imported foreign high-frequency CCL materials. Its balanced advantages of ultra-low Dk/Df, ultra-high Tg, temperature-stable dielectric properties, FR4-compatible manufacturing flow and customizable copper foil options make it the optimal dielectric material for hybrid RF-digital PCB stackups like the4-layer WL-CT338 TG170 FR4hybrid PCB described above. With halogen-free formulation, radiation resistance and low vacuum outgassing characteristics, WL-CT338 satisfies strict reliability standards of aerospace and defense electronics, while standardized mass production capacity achieves better cost control compared with imported thermoplastic PTFE and hydrocarbon laminates, supporting large-scale commercialization of high-frequency communication and radar equipment.