Wangling WL-CT350 4mil Laminate PCB 2-Layer Immersion Gold No Solder Mask Black Silkscreen

Wangling WL-CT350 4mil Laminate PCB 2-Layer Immersion Gold No Solder Mask Black Silkscreen

Executive Summary

This presentation delivers an in-depth, data-backed technical overview of the 2-layer WL-CT350 hydrocarbon ceramic RF PCB finished with immersion gold surface treatment, separated into two independent modules: finished PCB assembly specifications and underlyingWL-CT350 copper clad laminate(CCL) core material analysis. The Wangling PCB targets microwave, aerospace, radar and satellite communication scenarios, balancing FR4-compatible manufacturability, stable high-frequency electrical performance, low passive intermodulation (PIM), and wide-temperature mechanical reliability—an economical alternative to traditional PTFE-based RF substrates likeTaconic TLX-8 without complex specialized fabrication workflows.

All dimensional, electrical and thermal parameters strictly follow IPC-Class-2 acceptance criteria, with full 100% electrical continuity testing before shipment. Distinct competitive differentiators include thermosetting hydrocarbon-ceramic dielectric architecture, ultra-low Z-axis CTE, Tg exceeding 280°C, and consistent Dk/Df stability across 0.5–25 GHz frequency bands, paired with immersion gold finish that optimizes SMT solderability and minimizes signal loss for precision RF circuits.

Part 1: WL-CT350 2L Immersion Gold PCB Finished Board Specification

1.1 PCB Construction Details Overview

This table aggregates all mechanical, manufacturing, surface finish and quality inspection specifications of the finished 2-layer RF PCB.

1.2 PCB Stackup Architecture Overview

This simplified table defines the symmetrical two-layer core stackup of the rigid PCB, using standard WL-CT350 4mil dielectric core with double-sided 35μm copper cladding.

1.3 PCB Circuit Statistical Data Overview

This table quantifies circuit geometry component counts, pad types, vias and signal network layout metrics for the sample PCB design.

1.4 Manufacturing & Performance Differentiators of WL-CT350 2L Immersion Gold PCB

• Unlike PTFE-based RF PCBs such as Taconic TLX-8 which require dedicated high-temperature lamination, special drilling bits and chemical treatment processes incompatible with standard FR4 production lines,WanglingWL-CT350 thermosetting ceramic hydrocarbon substrates adopt fully FR4-compatible fabrication workflows, drastically lowering manufacturing lead time and production cost while retaining premium RF electrical performance. The2-layer Wanglingboard eliminates solder mask on both sides to remove dielectric layer interference above RF transmission lines, reducing parasitic capacitance and insertion loss at microwave frequencies, paired with white top silkscreen for clear component marking without disrupting high-frequency signal propagation.

• Immersion gold surface finish is selected over bare copper or HASL for three core RF advantages: uniform thin nickel-gold plating eliminates surface roughness-induced PIM distortion, delivers consistent solderability for fine-pitch SMT pads (minimum 5 mil trace width), and prevents copper oxidation under long-term high-temperature cycling ranging from -55°C to 260°C operating temperature. The 20μm via plating thickness ensures robust copper barrel integrity during repeated thermal shock cycles, matching the substrate’s ultra-low Z-axis thermal expansion coefficient of only 34 ppm/°C to avoid barrel cracking or pad delamination common on conventional FR4 or low-grade thermoplastic RF boards.

1.5 Typical Finished PCB Application Scenarios

The WL-CT350 2-layer immersion gold PCB is engineered for mid-to-high frequency RF hardware operating between 0.5 GHz and 25 GHz, including：

• Airborne and shipborne radar subsystems
• Satellite navigation antenna feed networks
• Mobile communication base station passive components
• Microwave test equipment
• Low-power RF power amplifiers
• Aerospace altimeter substrates requiring radiation resistance
• Ultra-low vacuum outgassing

Its mechanical stability under severe vibration and extreme temperature fluctuations makes it suitable for space launch vibration environments and marine naval antenna hardware where PTFE alternatives incur excessive processing overhead.

1.6 Conclusion for Finished WL-CT350 PCB

This immersion gold WL-CT350 RF PCB forms a cost-performance balanced high-frequency circuit solution that bridges the performance gap between low-loss PTFE laminates and low-cost FR4 materials. Standardized FR4 manufacturability cuts fabrication complexity without sacrificing stable Dk/Df, low PIM (≤-157 dBc with RTF copper foil), wide temperature dimensional stability and UL94 V-0 flame retardancy. The solder-mask-free design, precise 20μm via plating, IPC-Class-2 quality assurance and immersion gold surface treatment collectively deliver consistent signal integrity for microwave passive and active circuits, serving as a drop-in upgrade option to replace imported PTFE PCBs for commercial and aerospace-grade RF hardware.

Part 2: In-Depth WL-CT350 CCL Copper Clad Laminate Core Material Knowledge

2.1 WL-CT350 CCL Product General Introduction

WL-CT350 belongs to the Wangling WL-CT series thermosetting organic polymer ceramic-filled woven fiberglass copper clad laminate manufactured by Taizhou Wangling Insulation Material Factory, constructed from a ternary composite system of hydrocarbon resin, micron-scale ceramic filler and E-glass woven cloth reinforcement. It differentiates itself from thermoplastic PTFE RF substrates (e.g., TLX-8 PTFE glass laminates) via cross-linked thermosetting resin chemistry, which delivers superior mechanical rigidity, higher glass transition temperature (Tg > 280°C), simplified FR4-compatible PCB processing, and controlled thermal expansion in X/Y/Z axes. The material targets microwave and aerospace applications requiring low insertion loss, minimal dielectric constant shift under temperature variation, anti-radiation performance and low vacuum outgassing compliant with space industry vacuum volatile standards.

WL-CT350 supports two copper foil variants: standard ED (Electrodeposited) copper foil and reverse-treated RTF copper foil. RTF foil features adhesive backing that boosts PIM performance down to≤-157 dBc by smoothing conductor surface roughness to reduce intermodulation distortion, ideal for passive antenna components sensitive to signal interference; ED copper foil offers higher peel strength (0.85 N/mm for 1 oz foil) for heavy-duty mechanical assembly such as bolted radar substrates. Customizable dielectric thickness ranges from 4 mil (0.102 mm) up to 60+ mil, with 30 mil (0.762 mm) core selected for the above finished PCB stackup to balance impedance control and mechanical rigidity. The laminate can also be bonded to aluminum base to form WL-CT350-AL metal-core RF substrates for high-power amplifier thermal dissipation requirements.

2.2 Full WL-CT350 CCL Datasheet Technical Parameter Table

All test standards reference IPC-TM-650, GB/T 4722-2017 and GB/T 12636-1990, with all values listed as typical measured performance data for design reference only.

2.3 Core Advantages of WL-CT350 Hydrocarbon Ceramic CCL vs PTFE RF Laminates

1) Simplified PCB Process Compatibility:

• Unlike PTFE substrates such as Taconic TLX-8 which require specialized etching, drilling and lamination equipment incompatible with mainstream FR4 production lines, WL-CT350 can be fully processed using standard FR4 fabrication workflows, shortening lead times and reducing manufacturing overhead by 20–40% for medium-batch RF PCB orders.

2) Superior Thermal & Dimensional Stability:

• Tg exceeding 280°C and ultra-low X/Y CTE of 11.14 ppm/°C minimizes Dk drift and pad delamination during lead-free reflow soldering and aerospace thermal cycling; TLX-8 PTFE features far higher Z-axis CTE (215 ppm/°C), creating higher risk of via barrel cracking under temperature swing.

3) Balanced RF Electrical Performance:

• Df of only 0.0039 at 10 GHz delivers low insertion loss comparable to mid-grade PTFE laminates, paired with tightly controlled Dk tolerance (±0.05) to guarantee consistent impedance across transmission lines, critical for phased array antenna beam forming networks.

4) Enhanced Mechanical & Environmental Durability: 

• Composite ceramic filler reduces material creep under sustained bolted mechanical stress for space launch vibration environments; anti-radiation formulation maintains stable dielectric performance after high-dose irradiation, with low outgassing properties satisfying aerospace vacuum chamber material requirements.

5) Cost-Effective Mass Production:

• As a domestically manufactured thermosetting high-frequency laminate, WL-CT350 avoids import tariffs and long overseas supply cycles of foreign PTFE brands, supporting stable large-volume supply for radar, communication and satellite mass-production projects.

2.4 WL-CT350 CCL Optional Customization Specifications

• Copper Foil Thickness: 0.5 oz (18μm), 1 oz (35μm); custom heavy copper thickness available on request

• Copper Foil Type: Standard ED copper foil, adhesive-backed RTF copper foil (adds 0.018 mm substrate thickness)

• Dielectric Thickness Series (ED Foil): 4mil, 6.6mil, 10mil, 13.3mil, 16.6mil, 20mil, 30mil, 40mil, 60mil

• Aluminum Base Variant: WL-CT350-AL with aluminum base thickness options 0.48 mm, 0.98 mm, 1.48 mm, 1.98 mm, 2.98 mm, 3.98 mm

• Standard Panel Sizes: 460×610 mm, 915×1220 mm; custom cut-to-size panels supported

Dielectric Thickness Options:

2.5 Conclusion for WL-CT350 CCL Core Material

WL-CT350 hydrocarbon ceramic thermosetting copper clad laminate establishes a versatile mid-high frequency substrate solution that resolves key limitations of traditional PTFE RF materials—excessive manufacturing complexity, poor thermal dimensional stability and high procurement cost—while retaining low-loss microwave electrical characteristics required for radar, aerospace and satellite communication hardware. 

Its tightly controlled Dk/Df, ultra-low thermal expansion, high Tg, FR4-compatible processing and configurable RTF/ED copper foil options enable design engineers to balance RF performance, production yield and total system cost for two-layer and multi-layer microwave PCBs, including the immersion gold finished 2-layer board detailed in the prior PCB specification module. For applications demanding both passive intermodulation stability and mass manufacturability, WL-CT350 serves as a reliable, domestically sourced alternative to imported PTFE glass laminates for commercial and light aerospace high-frequency circuit designs.