Reducing Signal Loss in High-Frequency Designs: F4BTMS300 laminate Dk of 3 at 10GHz with RTF Copper Foil

Product Description

High-Performance F4BTMS300 Aerospace-Grade Microwave Laminate & Custom PCB Solution

 

As the aerospace, defense, and satellite communication industries demand ever-higher performance and reliability, material selection becomes critical. At our Chinese manufacturing facility, we specialize in custom high-frequency circuit boards and base materials, offering solutions built on advanced substrates. This article introduces the exceptional F4BTMS300 laminate – a domestically developed, aerospace-grade PTFE-based composite – and presents our precision 2-layer PCB solution tailored to harness its full potential.

 

1. F4BTMS300 Material Overview

The F4BTMS series is an upgraded version of the established F4BTM series, incorporating significant technological breakthroughs in both formulation and manufacturing processes. F4BTMS300, in particular, is a high-performance composite designed to meet the stringent demands of aerospace and high-reliability applications, offering a viable alternative to comparable foreign materials.

 

 

Material Composition & Technology

F4BTMS300 is a ceramic-filled PTFE (polytetrafluoroethylene) composite reinforced with ultra-thin and ultra-fine glass fiber cloth. The key innovations include:

 

High Ceramic Loading: A large volume of uniformly dispersed specialty nano-ceramics is blended with PTFE resin, significantly enhancing electrical and mechanical properties.

 

Minimized Glass-Fiber Effect: The use of ultra-fine glass fiber reinforcement minimizes the negative impact on electromagnetic wave propagation, resulting in lower dielectric loss and reduced anisotropy.

 

Standard RTF Copper Foil: The material comes standard with RTF (Reverse Treated Foil) low-roughness copper foil, which reduces conductor loss while maintaining excellent peel strength. It can also be supplied with aluminum or copper base plates for enhanced thermal management.

 

Key Technical Specifications (F4BTMS300)

Product Technical Parameter	Product Model/Data		F4BTMS300
Product Characteristics	Test Conditions	Unit	Value
Dielectric Constant (Typical)	10 GHz	/	3
Dielectric Constant Tolerance	/	/	±0.04
Dielectric Constant (Design Value)	10 GHz	/	3
Dissipation Factor (Typical)	10 GHz	/	0.0013
	20 GHz	/	0.0015
	40 GHz	/	0.0019
Temperature Coefficient of Dielectric Constant	-55 °C ~ 150 °C	PPM/°C	-20
Peel Strength	1 oz RTF copper foil	N/mm	>1.2
Volume Resistivity	Normal state	MΩ·cm	≥1×10⁸
Surface Resistance	Normal state	MΩ	≥1×10⁸
Electrical Strength (Z-direction)	5 kW, 500 V/s	KV/mm	>40
Breakdown Voltage (XY-direction)	5 kW, 500 V/s	KV	>52
CTE (X, Y-direction)	-55 °C ~ 288 °C	ppm/°C	10–11
CTE (Z-direction)	-55 °C ~ 288 °C	ppm/°C	22
Thermal Stress	260 °C, 10 s, 3 cycles	/	No delamination
Water Absorption	20±2 °C, 24 hours	%	0.025
Density	Room temperature	g/cm³	2.28
Long-term Operating Temperature	Thermal chamber	°C	-55 ~ +260
Thermal Conductivity	Z-direction	W/(m·K)	0.58
Flammability	/	UL-94	V-0
Material Composition	/	/	PTFE, ultra-thin fine glass fiber, ceramic

 

 

2. Core Features & Advantages

F4BTMS300 delivers a unique combination of properties that make it an ideal choice for mission-critical applications:

 

Tight Dk Tolerance (±0.04): Excellent batch-to-batch consistency ensures reliable and repeatable circuit performance.

 

Ultra-Low Dielectric Loss: With a dissipation factor as low as 0.0013 at 10 GHz and only 0.0019 at 40 GHz, the material supports high-efficiency signal transmission across a wide frequency range.

 

Exceptional Frequency Stability: Stable Dk and low loss values up to 40 GHz make it suitable for phase-sensitive applications.

 

Excellent Temperature Stability: The low TCDk (-20 ppm/°C) ensures stable phase and electrical performance across the -55°C to +150°C range.

 

Superior Radiation Resistance: Maintains stable dielectric and physical properties after exposure to radiation doses, critical for space applications.

 

Low Outgassing: Complies with aerospace requirements for vacuum outgassing, ensuring suitability for spaceborne equipment.

 

Low CTE: Minimal X/Y/Z thermal expansion ensures excellent dimensional thermal stability and reliable plated-through-hole (PTH) integrity.

 

Enhanced Thermal Conductivity: Supports higher power applications with improved heat dissipation compared to traditional PTFE materials.

 

Excellent Dimensional Stability & Low Moisture Absorption: Ensures consistent performance and reliability in harsh environments.

 

Standard PCB Processing: Can be fabricated using standard PTFE-based circuit board processes, with demonstrated excellent machinability for dense hole patterns and fine-line circuitry.

 

 

3. Custom 2-Layer PCB Solution on F4BTMS300

Leveraging the advanced properties of F4BTMS300, we offer the following precision-engineered 2-layer rigid PCB solution, optimized for high-frequency and high-reliability applications including aerospace, radar, and satellite communications.

 

 

PCB Construction Details

Parameter	Specification
Base Material	F4BTMS300
Number of Layers	2
Finished Board Size	66.04 mm × 78.00 mm (±0.15 mm)
Finished Board Thickness	0.25 mm
Minimum Trace / Space	4 / 6 mils
Minimum Hole Size	0.35 mm (through-hole only; no blind vias)
Outer Layer Copper Weight	1 oz (35 μm)
Via Plating Thickness	20 μm
Surface Finish	ENIG (Electroless Nickel Immersion Gold)
Top Silkscreen	None
Bottom Silkscreen	None
Top Solder Mask	None
Bottom Solder Mask	None
Electrical Testing	100% prior to shipment
Accepted Quality Standard	IPC-Class-2
Artwork Format	Gerber RS-274-X
Global Availability	Worldwide shipping

 

 

Design & Manufacturing Highlights

 

Ultra-Thin Construction: At just 0.25 mm finished thickness with a 5 mil (0.127 mm) core, this PCB offers a low-profile, lightweight solution ideal for compact aerospace and microwave assemblies.

 

Fine-Feature Capability: Our process supports 4/6 mil trace/space and 0.35 mm micro-vias, enabling dense, high-frequency circuit designs with excellent signal integrity.

 

High-Conductivity Copper Layers: 1 oz (35 μm) copper on both outer layers, combined with the RTF low-roughness foil, minimizes conductor losses for high-frequency operation.

 

Reliable Interconnects: The ENIG surface finish provides a flat, oxidation-resistant, and highly solderable surface, ensuring robust component attachment and wire-bonding reliability.

 

Robust Via Reliability: With 20 μm via plating and the material's low Z-axis CTE (22 ppm/°C), the PCB offers excellent plated-through-hole reliability even under thermal cycling conditions.

 

Strict Quality Control: Every board is subjected to 100% electrical testing and manufactured to IPC-Class-2 standards, guaranteeing consistent performance and reliability.

 

 

4. Typical Applications

 

Aerospace & Defense: Spaceborne equipment, cabin electronics, military radar systems.

 

RF & Microwave: High-frequency signal processing modules, feed networks.

 

Antenna Systems: Phase-sensitive antennas, phased-array antennas, GPS/GNSS antennas.

 

Satellite Communications: Transceivers, downconverters, and other payload electronics.

 

Test & Measurement: High-frequency test fixtures and chip testers.

 

 

5. Conclusion

As a specialized supplier of custom high-frequency circuit boards, we combine the advanced performance of F4BTMS300 – China's domestically developed aerospace-grade laminate – with our precision manufacturing capabilities to deliver world-class PCB solutions. Our 2-layer offering fully leverages F4BTMS300's superior dielectric stability, thermal management, mechanical robustness, and radiation resistance, ensuring your most demanding applications achieve the highest levels of performance and reliability.

 

Whether you are designing for space, defense, or advanced communications, our engineering team is ready to support your project. For technical consultations, samples, or production orders, please contact us today. We look forward to being your trusted partner in high-frequency innovation.