F4BM245 2-Layer 20mil Core Rigid High Frequency PCB with Immersion Gold for RF Radar Satellite & Base Station Antenna

Printed Circuit Boards are custom-made products; the images and specifications provided are for reference only.

1. Product Introduction

F4BM245 2-layer 20mil core high frequency PCB is a cost-effective commercial and industrial-grade microwave circuit board belonging to the upgraded F4BM/F4BME PTFE fiberglass laminate series. Fabricated with scientifically proportioned woven fiberglass fabric, high-purity PTFE resin and PTFE film via strict precision pressing processes, this high-performance PCB substrate achieves comprehensive upgrades in dielectric stability, insulation performance and high-frequency loss control compared with traditional F4B series materials. Supporting flexible dielectric constant adjustment and dual copper foil configuration options, F4BM245 adopts standard ED copper foil to suit conventional non-PIM high-frequency scenarios, while the homologous F4BME version uses RTF reverse-treated copper foil for low conductor loss and superior PIM performance. Finished with premium immersion gold surface treatment and manufactured in compliance with IPC-Class-2 standards, every 0.6mm thick rigid 2-layer PCB undergoes 100% full electrical testing before shipment, serving as a reliable and cost-effective imported material substitute for global RF, radar and antenna communication systems.

2. Core Product Features

1. Stable Low-Loss Dielectric Performance: F4BM245 substrate maintains a stable dielectric constant (Dk) of 2.45 at 10GHz, paired with an ultra-low dissipation factor of 0.0012 at 10GHz. The optimized material formula effectively reduces high-frequency signal attenuation, ensuring clean and efficient signal transmission for RF and microwave circuits.
2. Controllable Thermal Dielectric Stability: Comes with a low thermal coefficient of Dk at -120 ppm/°C within the temperature range of -55°C to 150°C, minimizing dielectric parameter drift caused by temperature fluctuations and guaranteeing consistent circuit performance in variable operating environments.
3. Graduated Thermal Expansion Characteristics: Features precise multi-axis CTE parameters, including X-axis 20 ppm/°C, Y-axis 25 ppm/°C and Z-axis 187 ppm/°C across -55°C to 288°C wide temperature range, balancing structural stability and process adaptability for conventional PCB fabrication.
4. Excellent Environmental Resistance: Boasts ultra-low moisture absorption rate of ≤0.08%, effectively preventing electrical performance degradation caused by humid working conditions. It also meets UL-94 V0 flammability standards, providing reliable fire safety performance for communication and radar equipment.
5. Customizable Dielectric Constant Control: By adjusting the proportion of PTFE resin and fiberglass cloth, F4BM245 realizes accurate Dk value calibration. Higher fiberglass content enhances dimensional stability and reduces thermal expansion, meeting diverse high-frequency circuit design requirements.

3. Product Performance Benefits

1. Upgraded Electrical Stability: Optimized composite material structure greatly improves insulation resistance and high-frequency signal stability compared with conventional F4B245 substrates, effectively reducing circuit interference and signal loss for continuous microwave operation.
2. Targeted Material Matching Design: Differentiated from F4BME245 (RTF copper foil version), F4BM245 adopts cost-effective ED copper foil, perfectly adapting to conventional RF and microwave scenarios without strict PIM performance requirements, balancing performance and manufacturing cost.
3. Superior Dimensional Consistency: Tuned fiberglass and PTFE ratio enhances overall structural rigidity, lowers thermal expansion coefficient and improves temperature drift resistance, reducing board deformation and etching shrinkage during processing.
4. High Safety & Environmental Adaptability: UL-94 V0 flame retardant grade and ultra-low moisture absorption enable stable operation in complex indoor and outdoor communication environments, improving equipment safety and service life.
5. Cost-Effective Import Substitution: Fully comparable to foreign mainstream microwave substrates in core electrical performance, F4BM245 simplifies procurement cycles and reduces comprehensive project costs while maintaining industrial-grade reliability.

4. PCB Construction Details

5. PCB Stackup Structure

This 2-layer rigid high frequency PCB adopts standard 20mil F4BM245 core substrate stackup structure, featuring uniform dielectric distribution, stable electrical performance and excellent structural consistency for high-frequency circuit applications:

1. Copper_layer_1: 35 μm
2. F4BM245 Core Substrate: 20mil (0.508mm)
3. Copper_layer_2: 35 μm

6. PCB Statistical Parameters

1. Total Components: 24
2. Total Pads: 36
3. Thru Hole Pads: 21
4. Top SMT Pads: 15
5. Bottom SMT Pads: 0
6. Total Vias: 28
7. Total Nets: 2

7. Production & Quality Standards

1. Artwork Supply Format: Gerber RS-274-X
2. Manufacturing Quality Standard: IPC-Class-2
3. Supply Scope: Worldwide Supply & Service

8. Typical Application Scenarios

Benefiting from adjustable dielectric constant options, ultra-low 10GHz dielectric loss, excellent radiation resistance, low outgassing performance and high dimensional stability, 20mil F4BM245 2-layer high frequency PCB covers both commercial and aerospace-grade high-frequency application scenarios. It is widely deployed in microwave circuits, RF components, radar systems, phase shifters, high-frequency passive devices, power dividers, couplers, combiners, antenna feed networks, phased array antennas, satellite communication systems and 4G/5G base station antenna equipment.

9. F4BM245 Copper Clad Laminate Knowledge

9.1 F4BM & F4BME Series Laminate Overview

F4BM245 Copper Clad Laminate belongs to the upgraded F4BM and F4BME PTFE fiberglass fabric substrate family, serving as a high-performance alternative to traditional standard F4B series materials. This advanced PCB material is fabricated with precisely proportioned woven fiberglass fabric, high-purity polytetrafluoroethylene (PTFE) resin and PTFE film, processed via strictly controlled industrial pressing techniques. Compared with conventional F4B substrates, the F4BM/F4BME series delivers comprehensively upgraded electrical performance, covering a broader adjustable dielectric constant range, ultra-low dissipation factor, higher insulation resistance and more stable high-frequency operating characteristics, fully capable of replacing imported international equivalent microwave laminates for both commercial and industrial high-frequency projects.

The F4BM and F4BME series share identical core dielectric layer formulations but adopt differentiated copper foil configurations to match diverse application scenarios. The standard F4BM version including F4BM245 is bonded with ED copper foil, optimized for conventional RF and microwave applications without strict Passive Intermodulation (PIM) requirements. In contrast, the upgraded F4BME variant uses professional reverse-treated RTF copper foil, featuring outstanding PIM suppression performance, higher precision circuit trace controllability and minimized conductor loss for high-sensitive high-frequency systems.

9.2 Core Structural & Physical Properties of F4BM245 Laminate

1. Adjustable Wide-Range Dielectric Constant: The F4BM and F4BME material series support flexible dielectric constant customization, with Dk values ranging from 2.17 to 3.0, and support custom tailored dielectric parameters for special circuit design demands. F4BM245 features a fixed stable Dk of 2.45 at 10GHz, realizing precise and consistent high-frequency electrical performance.
2. Ultra-Low High-Frequency Dissipation Performance: Optimized PTFE and fiberglass composite structure effectively reduces high-frequency signal attenuation, achieving an ultra-low dissipation factor of 0.0012 at 10GHz. It ensures high-efficiency, low-loss signal transmission for long-running microwave and RF circuit systems.
3. Tunable Dimensional & Thermal Stability: Precise adjustment of the PTFE-to-fiberglass ratio balances low dielectric loss and structural rigidity. Higher fiberglass content further optimizes thermal expansion coefficients, improves temperature drift resistance and enhances overall dimensional stability, while maintaining acceptable low-loss performance for commercial high-frequency scenarios.
4. Dual Copper Foil Process Adaptability: Matched with cost-effective ED copper foil for mass commercial production, and compatible with RTF reverse-treated copper foil upgrading. The dual-process design covers ordinary and high-precision low-PIM application requirements with flexible cost-performance matching.
5. Aerospace-Grade Environmental Reliability: Possesses excellent radiation resistance and ultra-low outgassing properties, meeting space and aerospace-grade environmental standards. Combined with ultra-low moisture absorption and UL-94 V0 flame retardant performance, it adapts to extreme and complex working environments.

9.3 Key Functional Advantages of F4BM245 Substrate

1. Comprehensively Upgraded Electrical Stability: Optimized formula and precise pressing process greatly improve insulation performance and high-frequency parameter stability compared with traditional F4B series substrates, effectively reducing circuit noise, signal loss and electrical drift during continuous operation.
2. Scenario-Based Differentiated Matching: The F4BM ED copper foil version provides cost-effective solutions for conventional RF microwave equipment, while the F4BME RTF copper foil variant achieves superior PIM performance and ultra-low conductor loss, meeting high-precision antenna and passive device design standards.
3. High Precision Dimensional Controllability: Adjustable fiberglass and PTFE proportion realizes customizable thermal expansion and temperature drift characteristics, effectively reducing processing deformation and etching shrinkage, suitable for fine-line and high-precision PCB fabrication.
4. Flexible Production & Cost Optimization: Supports multiple customizable panel sizes to reduce raw material waste and lower overall manufacturing costs. Compatible with mature PTFE PCB production processes, it realizes stable high-volume commercial production with excellent cost-performance ratio.
5. Dual-Grade Application Compatibility: Integrates commercial-grade mass production advantages and aerospace-grade environmental resistance performance, covering low-cost civilian communication equipment and high-reliability aerospace microwave device application scenarios.

9.4 Laminate Typical Application Fields

With adjustable dielectric constants, ultra-low high-frequency loss, excellent environmental stability and flexible cost-performance matching, F4BM245 and F4BME series laminates are widely used in full-scenario high-frequency electronic fields. Typical applications include microwave circuits, RF components, military and civil radar systems, phase shifters, high-frequency passive devices, power dividers, couplers, combiners, antenna feed networks, phased array antenna systems, satellite communication terminals and 4G/5G base station antenna equipment.

9.1 F4BM245 High-Frequency Laminate Introduction

F4BM245 Copper Clad Laminate is a cost-effective high-frequency microwave substrate optimized and upgraded on the basis of traditional F4B245 materials, specially developed for commercial RF, microwave and antenna communication systems. This professional PCB material is manufactured through scientific proportioning and strict pressing technology, composited with high-quality fiberglass cloth, polytetrafluoroethylene resin and PTFE film. Compared with conventional F4B245 substrate, it achieves lower dielectric loss and higher insulation stability, capable of replacing imported equivalent microwave laminates for mass commercial applications. Matched with premium ED copper foil as standard configuration, the laminate is suitable for conventional high-frequency scenarios without strict PIM performance requirements, while the homologous F4BME245 version adopts RTF reverse-treated copper foil for low conductor loss and high-precision line processing needs.

9.2 Core Structural & Physical Properties of F4BM245 Laminate

1. Precise Tuned Dielectric Constant: Realizes accurate Dk value control at 2.45 @10GHz by adjusting the mixing ratio of fiberglass cloth and PTFE resin. The optimized material formula balances low-loss performance and structural stability to adapt to diverse commercial high-frequency circuit designs.
2. Ultra-Low High-Frequency Loss: Features an ultra-low dissipation factor of 0.0012 at 10GHz, effectively suppressing high-frequency signal attenuation and ensuring efficient and stable signal transmission for microwave and RF circuits.
3. Stable Thermal Dielectric Performance: Maintains a low thermal coefficient of dielectric constant at -120 ppm/°C in the range of -55°C to 150°C, effectively restraining electrical parameter drift caused by ambient temperature changes and improving circuit operational stability.
4. Graded Multi-Axis CTE Stability: Equipped with scientific X/Y/Z three-axis thermal expansion parameters, adapting to temperature changes from -55°C to 288°C. Reasonable CTE matching reduces thermal stress during PCB processing and operation, improving finished board yield.
5. Excellent Environmental & Safety Performance: Comes with ultra-low moisture absorption (≤0.08%) to avoid damp-induced electrical failure, and meets UL-94 V0 flame retardant standard, providing reliable safety guarantee for outdoor communication and radar equipment.

9.3 Key Functional Advantages of F4BM245 Substrate

1. Upgraded Electrical Stability: Optimized composite structure significantly improves insulation resistance and high-frequency signal stability compared with traditional F4B series substrates, reducing circuit noise and signal loss for long-term continuous operation.
2. Dual-Version Differentiated Application: Cooperates with ED copper foil for cost-effective conventional scenarios, while the F4BME245 variant with RTF copper foil meets high-precision, low PIM and low conductor loss requirements, covering full-range commercial high-frequency application needs.
3. Adjustable Dimensional Stability: Increased fiberglass proportion optimizes thermal expansion performance and temperature drift resistance, delivering higher dimensional accuracy and processing stability for fine-line circuit fabrication.
4. Excellent Process Compatibility: Adapts to conventional PTFE PCB manufacturing processes, supporting hole processing, etching and surface finishing, with stable processing performance and high mass-production yield.
5. High Cost-Performance Replacement: Achieves equivalent high-frequency performance of imported substrates with lower manufacturing and procurement costs, becoming the preferred material for mass-produced commercial antenna and RF circuit boards.

9.4 Laminate Typical Application Fields

As a high-stability and cost-effective PTFE composite microwave PCB material, F4BM245 substrate is widely applied in commercial wireless communication and microwave electronic fields. It is mainly used for manufacturing RF microwave systems, radar equipment, phase shifters, power dividers, couplers, combiners, antenna feed networks, phase-sensitive antennas, phased array antennas, satellite communication devices and base station antenna systems.

10. DataSheet