WL-CT440 PCB 30mil 0.762mm Wangling Laminate ENIG Finish No Solder Mask

WL-CT440 PCB 30mil 0.762mm Wangling LaminateENIG Finish No Solder Mask

1. Product Overview

The WL-CT440 30mil ENIG PCB is a high-performance 2-layer rigid printed circuit board purpose-built for high-frequency, high-temperature, and high-reliability environments. Built on Wangling WL-CT440 hydrocarbon-ceramic thermoset dielectric laminate, this board delivers stable dielectric properties, ultra-low signal loss, excellent thermal stability, and mechanical robustness. It adopts ENIG (Electroless Nickel Immersion Gold) surface finishing to ensure superior solderability, oxidation resistance, and contact reliability for fine-pitch RF circuits and precision components. Compliant with IPC-Class 2 standards and fully tested for electrical continuity, this WL-CT PCB balances performance, processability, and cost efficiency, serving as a dependable alternative to imported high-frequency materials while supporting global supply.

This 30mil WL-CT440 board is optimized for microwave antennas, phased-array systems, radar front-ends, satellite communication modules, and power amplifiers where signal integrity, temperature stability, and long-term durability are critical. Its design eliminates unnecessary silkscreen and solder mask layers to reduce parasitic effects and insertion loss at GHz frequencies, making it ideal for high-sensitivity RF and high-speed circuits.

2. PCB Construction Details

The following table summarizes the board’s mechanical, electrical, and fabrication specifications, supporting stable manufacturing and consistent performance.

3. PCB Stackup Structure

The symmetrical stackup ensures consistent impedance control, low warpage, and reliable interlayer adhesion under thermal cycling.

4. PCB Layout & Interconnection Statistics

This table reflects the board’s compact, high-efficiency routing design suitable for miniaturized RF modules.

5. Core Advantages & Differentiators

5.1 Material Superiority

WL-CT440 is a thermosetting hydrocarbon-ceramic dielectric engineered for GHz-range applications. Unlike PTFE-based materials that require specialized processing, WL-CT440 uses standard FR-4-compatible fabrication, improving yield, stability, and uniformity while lowering total cost. The formulation combines low dielectric loss, high thermal resistance, and stable temperature coefficients, supporting reliable operation from−55°C to +260°C.

5.2 Excellent High-Frequency Performance

• Dielectric constant Dk = 4.1 @ 10 GHz, tight tolerance±0.08
• Dissipation factor Df = 0.004 @ 10 GHz, minimizing signal attenuation
• TCDK =−21 ppm/°C, ensuring stable electrical performance across temperature
• Low moisture absorption (0.12%), preventing Dk/Df drift in humid environments

5.3 Thermal & Mechanical Reliability

• High Tg > 280°C, resisting delamination at lead-free reflow temperatures
• CTE X:14, Y:18, Z:35 ppm/°C, closely matched to copper for reduced thermal stress
• Thermal conductivity 0.66 W/(m·K), supporting power amplifier and active RF devices
• Passes 288°C, 10s, 3×thermal stress without blistering or delamination

5.4 ENIG Surface Finish Benefits

• ENIG provides a flat, dense protective layer ideal for high-frequency circuits:
• Outstanding flatness supports fine-pitch SMT and consistent impedance
• Excellent oxidation resistance extends storage life up to 12–18 months
• Stable low contact resistance for RF probes and connectors
• Compatible with multiple reflow cycles without degradation

5.5 Simplified RF-Optimized Structure

• By omitting solder mask and silkscreen, the design:
• Reduces parasitic capacitance and insertion loss
• Improres signal integrity at microwave frequencies
• Lowers risk of contamination or defects in critical RF areas
• Enhances thermal dissipation for power stages

6. Typical Applications

• Aerospace, avionics, and space cabin systems
• Microwave antennas, phase-sensitive antennas
• Early-warning radar, airborne radar
• Phased-array antennas, beam-forming networks
• Satellite communications and navigation
• High-frequency power amplifiers
• Tactical radio and 5G millimeter-wave components

7. Conclusion

The WL-CT440 30mil ENIG 2-layer PCB is a professionally engineered high-frequency solution that delivers exceptional dielectric stability, ultra-low loss, robust thermal performance, and reliable manufacturability. Its material advantages, RF-optimized structure, strict quality control it highly suitable for aerospace, radar, satellite communication, and high-power RF systems. By combining advanced hydrocarbon-ceramic CCL technology with practical PCB design, this product achieves strong differentiation in performance, reliability, and cost compared to both standard FR-4 boards and high-cost PTFE-based boards. It represents a mature, high-value choice for developers seeking dependable, globally availablehigh-frequency PCBs.

Part 2: WL-CT440 Copper Clad Laminate (CCL) Technical Datasheet & Knowledge

This section provides detailed, standalone CCL knowledge with full datasheet values, material science and application guidance.

1. Basic Introduction to WL-CT440 CCL

WL-CT440 is a high-performance organic polymer-ceramic fiberglass cloth copper-clad laminate developed by Taizhou Wangling Insulation Materials Factory. It belongs to a thermosetting hydrocarbon-ceramic resin system designed specifically for high-frequency, high-speed, and high-reliability electronics. The dielectric layer consists of hydrocarbon resin, ceramic fillers, and fiberglass reinforcement, achieving an ideal balance of low loss, thermal stability, mechanical strength, and conventional PCB process compatibility.

Compared with PTFE, WL-CT440 PCB substrate supports standard lamination, drilling, plating, and etching similar to FR-4, greatly improving production efficiency and consistency. It is a cost-effective domestic alternative to imported high-frequency laminates.

2. Complete CCL Datasheet Table

3. Key CCL Features & Technical Highlights

3.1 Ultra-Low Loss & Stable Dielectric Properties

Low Df minimizes signal attenuation; tight Dk tolerance supports accurate impedance control. Excellent TCDK ensures stable performance over−55°C to +150°C, critical for phased arrays and radar.

3.2 Outstanding Thermal Stability

High Tg >280°C and high Td ensure structural integrity at lead-free reflow and high operating temperatures. Low CTE in X/Y matched to copper reduces warpage and via failure.

3.3 Good Thermal Conductivity

0.66 W/(m·K) supports power amplifiers and active RF components, improving heat dissipation without metal cores.

3.4 Low Water Absorption

Only 0.12% moisture absorption prevents Dk/Df shift in high-humidity environments, ideal for outdoor and aerospace use.

3.5 Excellent Process Compatibility

Fabricated with standard FR-4 equipment; supports multiple laminations for multilayer boards; performs well in fine lines and dense holes.

3.6 High Reliability & Environmental Adaptability

UL94 V-0, low outgassing for vacuum space applications, good radiation resistance, stable under harsh conditions.

4. Available Specifications

• Copper foil: ED only; thickness 0.5 oz, 1 oz
• Dielectric thickness: 10, 20, 30 mil (0.254, 0.508, 0.762 mm)
• Panel sizes: 460×610 mm, 915×1220 mm
• Aluminum-back version: WL-CT440-AL for shielding and enhanced heat dissipation

5.Material Selection Guidance

When comparing WL-CT440 to other high-frequency materials:

• For < 6 GHz designs with moderate loss requirements: Consider FR4 or IS410 (loss tangent ~0.01). But for > 6 GHz, CT440 is superior.

• For 10-30 GHz requiring Dk ~ 3.0-3.5 and <0.003 Df: Consider PTFE-based like RO3003 or RT/duroid 5880, but expect higher cost and processing difficulty.

• For 10-30 GHz requiring Dk ~ 4.0 and low process cost: WL-CT440 is an ideal candidate, matching performance of RO4350B (Dk 3.48) but at potentially lower cost and with better thermal conductivity (0.66 vs 0.62 W/m·K for RO4350B).

Conclusion for CCL Material Section

WL-CT440 laminate is a versatile, high-reliability thermosetting hydrocarbon-ceramic laminate that successfully competes with incumbent PTFE-based solutions. Its key strengths include an FR4-compatible fabrication process, high Tg (>280°C), stable Dk over temperature, low moisture absorption, and robust thermal-mechanical properties. With a complete datasheet spanning electrical, thermal, and mechanical domains, and available in multiple thicknesses and panel sizes, WL-CT440 is particularly well-suited for aerospace radar, 5G infrastructure, satellite communication, and power amplifier modules seeking cost-effective volume production without sacrificing microwave performance.