4-Layer WL-CT330 + High Tg FR-4 S1000-2M 2.7mm Thick Hybrid PCB with Immersion Gold

4-Layer WL-CT330 + High Tg FR-4 S1000-2M 2.7mm Thick Hybrid PCB with Immersion Gold 

Introduction

As the demand for high-speed, low-loss, and thermally stable PCBs continues to rise across the RF, microwave, and high-speed digital industries, the selection of laminate materials becomes a critical success factor. Traditional materials like PTFE offer excellent electrical properties but suffer from manufacturing complexity, poor dimensional stability, and high cost. FR-4, while economical and easy to process, falls short in high-frequency applications due to its higher and less stable dielectric constant and dissipation factor.

The 4-Layer WL-CT330 PCB with Immersion Gold bridges this technological gap. Designed for advanced RF and high-speed applications—such as 5G/6G base stations, automotive radar, satellite communications, and aerospace systems—thishybrid circuit board leverages the exceptional properties of Wangling WL-CT330, a thermosetting hydrocarbon resin with ceramic and fiberglass reinforcement. We will provide a detailed technical description of the PCB construction, stackup, statistics, and an in-depth knowledge base on the WL-CT330 copper clad laminate(CCL).

1. PCB Construction Overview

The following table summarizes the core mechanical, electrical, and surface-finish specifications of this 4-layer hybrid PCB, defining its structural integrity and processing capabilities.

2. PCB Layer Stack-up

This section details the layer sequence, material types, and thickness distribution to ensure impedance control, thermal stability, and signal integrity in high-frequency operation.

3. PCB Layout & Net Statistics

The table below provides key design data for component mounting, routing density, and electrical interconnection.

WL-CT330 CCL–Deep Technical Knowledge Base

The performance of the above WL-CT330 High Tg FR-4 hybrid PCB is fundamentally enabled by WL-CT330, a state-of-the-art copper-clad laminate (CCL) from Taizhou Wangling Insulation Materials Factory. Below is a detailed technical overview of this material, including its chemistry, electrical, thermal, and mechanical properties.

What is WL-CT330?

WL-CT330 is a thermosetting, hydrocarbon-based laminate reinforced with ceramic fillers and fiberglass fabric. Unlike PTFE-based laminates (which require special sodium etching and have poor dimensional stability), WL-CT330 substrate is designed to be processed using standard FR-4 PCB fabrication equipment (drill bits, etchants, and lamination cycles). This significantly reduces manufacturing complexity and cost while delivering near-PTFE electrical performance.

Key Chemistry: Hydrocarbon resin + Composite ceramics + Fiberglass reinforcement.

Classification: Organic polymer ceramic glass fabric copper-clad laminate (WL-CT Series).

WL-CT330 Properties

The table below consolidates the critical electrical, thermal, and mechanical parameters of WL-CT330 laminate, demonstrating its suitability for demanding high-frequency and high-reliability applications.

Key Material Features

1)Ultra-low loss & stable Dk: Df = 0.0026 at 10 GHz with tight Dk tolerance±0.06, ensuring consistent signal propagation across frequency and temperature.

2)Excellent thermal stability: Tg > 280°C, low Z-axis CTE, and high thermal resistance protect vias and interfaces during multiple reflows.

3)FR-4 process compatibility: No specialized equipment needed; supports multilayer lamination, fine lines, and dense drilling.

4)Low moisture absorption: Only 0.05% max, preserving electrical performance in high-humidity environments.

5)Halogen-free & flame retardant: UL 94 V-0 rating for safety in aerospace, automotive, and telecom systems.

6)Superior PIM performance: RTF reverse-treated foil achieves PIM≤ −157 dBc, ideal for high-sensitivity receivers and antennas.

7)High thermal conductivity: Improves heat dissipation in power amplifiers and active RF modules.

Available Configurations

*Copper foil types: Standard ED or RTF (reverse-treated foil); thicknesses 0.5 oz (0.018 mm) or 1 oz (0.035 mm).

*Available Dielectric Thicknesses (ED Copper):  

0.254mm (10 mil)±0.025mm

0.508mm (20 mil)±0.038mm

0.762mm (30 mil)±0.051mm

1.016mm (40 mil)±0.076mm

1.524mm (60 mil)±0.10mm (used as core in this PCB)

2.03mm (80 mil)±0.127mm

Starts at 0.254 mm (10 mil), available in 10 mil increments up to 3.05 mm.

*Aluminum-backed option:  WL-CT330-AL integrates aluminum base for enhanced heat dissipation and electromagnetic shielding.

*Panel sizes: Standard 460×610 mm and 915×1220 mm; custom sizes available.

Processing Guidelines

WL-CT330 uses standard FR-4 lamination, drilling, desmear, and plating. It supports multi-layer pressing and fine-line manufacturing, making it suitable for mass production of high-frequency PCBs.

Typical Applications

-5G/6G base stations and phased-array antennas

-Automotive radar (ADAS, V2X)

-Satellite communications and navigation

-Aerospace and defense radar systems

-RF power amplifiers and transceivers

-High-speed backplanes and networking hardware

Conclusion on WL-CT330 CCL

WL-CT330 PCB laminate represents a cost-effective, high-performance alternative to PTFE and other hydrocarbon-based laminates. Its unique combination of stable electrical properties, FR-4 processability, high thermal reliability (Tg>280°C), and mechanical robustness (matched CTE, low Z-axis expansion) makes it an ideal choice for the 4-layer PCB described above. Engineers can confidently design high-frequency, high-reliability systems without compromising on manufacturability or long-term stability, especially in demanding environments such as automotive, aerospace, and 5G infrastructure.