High-Frequency 2-Layer PCB on 59mil Wangling TP440 Thermoplastic Dielectric Immersion Gold

Overview

This article provides a comprehensive technical overview of the TP440 PCB, a 2-layer rigid high-frequency printed circuit board manufactured on a Wangling TP440 thermoplastic dielectric substrate with a 59mil (1.5 mm) core thickness and immersion gold surface finish. The document is organized into two distinct parts.

Part I details the PCB construction, layer stackup, and manufacturing statistics, highlighting the board's design parameters and quality standards.

Part II presents an in-depth examination of the TP440 copper-clad laminate (CCL) material, including its complete data sheet, material composition, electrical and thermomechanical properties, available specifications, and processing guidelines. Each part concludes with a dedicated summary to reinforce the key technical takeaways.

Part I: TP440 PCB Product Description

1. Product Overview

The Wangling TP440 PCB is a precision-engineered 2-layer rigid circuit board designed for high-frequency RF and antenna applications. Built on a 1.5 mm (59mil) TP440 dielectric core with 1 oz (35 μm) copper on both outer layers, the board achieves a finished thickness of 1.6 mm. The immersion gold surface finish provides excellent solderability, flat contact surfaces, and corrosion resistance — properties particularly valuable for RF connectors and high-frequency signal paths.

2. PCB Construction Details

The following table summarizes the complete construction specifications of the TP440 high frequency PCB, covering dimensional tolerances, feature sizes, copper weights, surface finish, and quality control measures.

3. PCB Stackup

The stackup employs a symmetric 2-layer rigid structure with a thick TP440 dielectric core sandwiched between two 35 μm copper layers, providing a stable and predictable substrate for high-frequency signal transmission.

4. PCB Statistics

The board accommodates 24 components across 19 pads with 28 through-hole vias, all organized under a single net — a configuration typical of dedicated antenna or RF feed structures.

5. Key Differentiators and Manufacturing Notes

Several design choices distinguish this Wangling TPPCB from conventional FR-4 boards and contribute to its suitability for high-frequency applications:

· TP440 High-Frequency Substrate: Unlike standard FR-4 (Dk ≈ 4.3–4.6, Df ≈ 0.02 at 1 GHz), the TP440 core delivers a tightly controlled dielectric constant of 4.4 ± 0.09 at 10 GHz and an ultra-low dissipation factor of 0.0010, minimizing insertion loss in microwave circuits.

· Bare-Copper (No Solder Mask) Configuration: The absence of solder mask on both layers eliminates the dielectric perturbation caused by mask materials (typically Dk ≈ 3.0–3.5), ensuring the designed impedance and radiation characteristics remain unaltered — a critical requirement for antenna and millimeter-wave designs.

· Immersion Gold Finish: Compared to HASL (hot air solder leveling), immersion gold provides a flat, coplanar surface essential for fine-pitch RF connectors and surface-mount microwave components. It also offers superior shelf life and avoids the thermal stress associated with HASL processes.

· 5/8 mil Trace/Space Capability: The fine-line capability enables compact routing of high-impedance transmission lines and closely spaced ground via arrays, supporting the miniaturization goals of modern antenna systems.

· IPC-Class-2 Compliance with 100% E-Test: Every board is electrically tested to verify continuity and isolation, ensuring reliable performance in mission-critical applications such as missile-borne electronics and fuze systems.

6. Typical Applications

The TP440 59mil PCB is engineered for high-reliability, high-frequency environments. Its combination of low dielectric loss, wide operating temperature range (-100 °C to +150 °C), radiation resistance, and low outgassing makes it particularly well-suited for the following applications:

· GPS and Beidou satellite navigation antennas

· Missile-borne RF electronics and guidance systems

· Fuze and proximity sensor circuits

· Miniaturized patch and waveguide antennas

· High-frequency RF transmission lines and power dividers

· Aerospace and defense communication subsystems

7. Conclusion (PCB Section)

The TP440 PCB 59mil Immersion Gold Finish represents a purpose-built high-frequency circuit solution that leverages the exceptional dielectric properties of the Wangling TP440 thermoplastic substrate. With its symmetric 2-layer stackup, 1 oz copper construction, bare-copper (solder-mask-free) configuration, and immersion gold surface finish, the board is optimized for impedance-controlled RF and antenna applications where signal integrity and dimensional precision are paramount.

For engineers seeking a high-performance, cost-effective alternative to ceramic substrates and conventional high-frequency laminates, this TP440 PCB delivers a compelling balance of electrical performance, mechanical robustness, and manufacturing accessibility.

Part II: TP440 Copper-Clad Laminate (CCL) Material Knowledge

1. Material Introduction

The Wangling TP series is a unique family of high-frequency thermoplastic copper-clad laminates developed specifically for microwave and millimeter-wave applications. Unlike conventional fiberglass-reinforced epoxy or PTFE substrates, TP-series laminates employ a dielectric layer composed of ceramic fillers dispersed in a polyphenylene oxide (PPO) resin matrix, with no glass fiber reinforcement. This composition enables precise tuning of the dielectric constant by adjusting the ratio of ceramic to PPO resin, allowing Dk values to be selected anywhere within the range of 3.0 to 25.0.

The TP440 designation refers to the TP-series variant with a nominal dielectric constant of 4.4. The product nomenclature follows a clear convention: TP denotes the bare dielectric material without copper cladding; TP-1 indicates single-sided copper-clad laminate; and TP-2 denotes double-sided copper-clad laminate. The PCB described in Part I utilizes a TP-2 (double-sided copper) configuration with 1 oz ED copper foil.

2. Material Composition and Structure

The TP440 dielectric consists of a homogeneous blend of polyphenylene oxide (PPO) resin and ceramic particulate fillers. The absence of woven glass fiber reinforcement yields several distinct advantages: the dielectric properties are isotropic (uniform in all directions), eliminating the "weave effect" that causes impedance variations in glass-reinforced laminates; the material can be machined using conventional methods including drilling, turning, grinding, shearing, and etching; and the copper-to-dielectric adhesion is achieved through direct resin bonding rather than through a glass fiber interface, resulting in more reliable peel strength than vacuum-metallized ceramic substrates.

The laminate is supplied with electrodeposited (ED) copper foil in two standard thicknesses: 0.018 mm (0.5 oz) and 0.035 mm (1 oz). The material density is 1.89 g/cm³, and the thermal conductivity is 0.44 W/(m·K), providing moderate heat dissipation capability for low-to-medium power RF circuits.

3. Complete Data Sheet (TP440)

The following table presents the complete technical data sheet for the TP440 material, covering electrical, mechanical, and thermal properties measured under standardized test conditions (IPC-TM-650 / GB/T 4722-2017 / GB/T 12636-1990).

5. Processing Guidelines and Limitations

As a thermoplastic material, TP440 requires specific processing considerations that differ from thermoset FR-4 and high-frequency laminates. The following guidelines are essential for successful fabrication and assembly:

• · Soldering: The material is not suitable for 260 °C thermal shock testing and cannot undergo wave soldering. Hand soldering with a constant-temperature soldering iron is the recommended assembly method. If reflow soldering is unavoidable, the peak profile temperature must not exceed 200 °C, and the feasibility and stability must be thoroughly evaluated before production.
• · Multilayer Fabrication: TP440 is generally not recommended for multilayer board construction due to its thermoplastic nature. If multilayer processing is required, low-temperature-type bonding sheets (prepregs) must be selected, and the overall process feasibility must be carefully assessed in advance.
• · Machinability: Unlike brittle ceramic substrates, TP440 can be processed using conventional PCB fabrication techniques including drilling, routing, shearing, etching, and plating. This machinability, combined with higher production yields and significantly lower processing costs compared to ceramic substrates, is a key economic advantage.
• · Storage and Handling: Boards should be stored in a dry, temperature-controlled environment. While the material's low water absorption minimizes moisture-related issues, standard ESD and moisture-sensitive device (MSD) handling practices are recommended to preserve the immersion gold finish and copper adhesion.

6. Available Specifications

TP440 laminatesare available in a range of standard panel sizes and thicknesses, with custom configurations available upon request.

Standard Panel Sizes (tolerance: -2 mm):

150 × 150 mm  |  160 × 160 mm  |  200 × 200 mm  |  170 × 240 mm

Available Thicknesses and Tolerances:

Thickness (mm)	Tolerance (mm)	Thickness (mm)	Tolerance (mm)
0.5	±0.04	3.0	±0.10
0.8	±0.05	4.0	±0.10
1.0	±0.05	5.0	±0.12
1.2	±0.05	6.0	±0.12
1.5	±0.06	7.0	±0.15
2.0	±0.075	8.0	±0.18
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