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Rogers TMM4

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Rogers TMM4 PCB Board

In the dynamic realm of electronic design, PCB manufacturers strive to identify materials that can meet the exacting requirements of high-frequency applications. Among the array of choices, Rogers TMM4 laminate emerges as an exceptional solution, delivering unparalleled performance and unwavering reliability. With its distinctive composition of thermosetting polymers and ceramics, TMM4 empowers designers to push the boundaries of high-frequency circuitry. This article delves into the remarkable attributes of Rogers TMM4 and its invaluable contributions to the field of electronic design, providing manufacturers with insights to harness its full potential.

Overview of TMM4

TMM® thermoset microwave materials are advanced composites consisting of ceramic, hydrocarbon, and thermoset polymer. These materials have been specifically designed for applications requiring high plated-thru-hole reliability in stripline and microstrip circuits. TMM laminates offer a diverse range of dielectric constants and claddings to meet various design requirements.

The exceptional electrical and mechanical properties of TMM laminates combine the advantages of ceramic and traditional PTFE microwave circuit laminates, eliminating the need for specialized production techniques associated with these materials. Unlike other laminates, TMM does not require a sodium napthanate treatment prior to electroless plating.

One notable feature of TMM laminates is their remarkably low thermal coefficient of dielectric constant, typically measuring less than 30 ppm/°C. This characteristic ensures stable performance over a wide temperature range. The material’s isotropic coefficients of thermal expansion, which closely match those of copper, enable the production of highly reliable plated through holes and minimize etch shrinkage. Additionally, TMM laminates exhibit approximately twice the thermal conductivity of traditional PTFE/ceramic laminates, facilitating effective heat dissipation.

TMM laminates are based on thermoset resins, which retain their structural integrity even when subjected to heat. Consequently, wire bonding of component leads to circuit traces can be carried out without concerns of pad lifting or substrate deformation.

By combining the desirable features of ceramic substrates with the ease of soft substrate processing techniques, TMM laminates offer an optimal solution for various applications. They can be clad with electrodeposited copper foil ranging from 1/2 oz/ft2 to 2 oz/ft2, or bonded directly to brass or aluminum plates. A wide range of substrate thicknesses, from 0.015″ to 0.500″, is available to accommodate specific design requirements. Moreover, the base substrate of TMM laminates is resistant to etchants and solvents commonly used in printed circuit production, allowing for the utilization of all standard PWB processes.

What Is Rogers TMM4?

Rogers TMM4 is a high-performance thermoset microwave material developed by Rogers Corporation, a leading manufacturer of advanced materials for electronic applications. TMM4 stands for “Thermoset Microwave Material 4.” It is specifically designed for high-frequency applications that require excellent electrical performance and reliable signal integrity.

Rogers TMM4 laminate is a thermosetting polymer material that incorporates hydrocarbons and ceramics. It stands out as an exceptional option for high-reliability stripline and microstrip circuits. Being a thermoset resin, Rogers TMM4 offers outstanding thermal and mechanical stability. Despite its low dielectric constant, it showcases remarkable resistance to elevated temperatures and humidity. Its exceptional electrical and mechanical properties make it an ideal choice for high-speed and micro-stripline applications.

The Rogers TMM4 laminates excel as a superior choice for multilayer PCB applications. Their low dissipation factor and dimensional accuracy position them favorably for high-frequency multilayer circuits. Given the material’s inherent resistance to both heat and moisture, Rogers TMM 4 emerges as a versatile option for diverse applications. Furthermore, these laminates are available in various strengths, enabling the selection of the most suitable material to align with specific project requirements.

Features and Benefits of Rogers TMM4

Features and benefits of Rogers TMM4 include:

Wide range of dielectric constants:

TMM4 offers a variety of dielectric constants, allowing for flexibility in designing single material systems for a wide range of applications. This feature simplifies the design process and enables efficient circuit performance.

Exceptional mechanical properties:

TMM4 laminates exhibit excellent resistance to creep and cold flow, ensuring long-term dimensional stability and reliability. This property is crucial for maintaining the integrity of the circuitry over time.

Coefficient of thermal expansion matched to copper:

The coefficient of thermal expansion of TMM4 closely matches that of copper, resulting in high reliability of plated through holes. This compatibility minimizes the risk of failures and ensures consistent performance, especially in applications with temperature variations.

Resistant to process chemicals:

TMM4 laminates are resistant to process chemicals commonly used in fabrication and assembly processes. This resistance reduces the potential for material damage during manufacturing, ensuring the integrity of the circuitry and improving overall product reliability.

Thermoset resin:

TMM4 is based on a thermoset resin, which offers several advantages. It enables reliable wire bonding of components to circuit traces without concerns of pad lifting or substrate deformation. Additionally, TMM4 does not require specialized production techniques, simplifying the manufacturing process.

Replacement for alumina substrates:

TMM10 and TMM10i laminates, which are part of the TMM4 product line, can serve as alternatives to alumina substrates. These laminates provide comparable performance while offering the benefits of the TMM4 material, such as improved mechanical properties and resistance to process chemicals.

Low Dielectric Loss:

which allows for efficient signal transmission with minimal energy loss. It offers a stable and low dielectric constant, ensuring consistent performance across a wide range of frequencies. The material also has a low thermal coefficient of dielectric constant, meaning its electrical properties remain stable even with temperature variations.

High Thermal Conductivity:

which enables efficient heat dissipation from the circuit. This attribute is particularly important in high-power applications, where heat management is crucial for maintaining performance and reliability.

Thicknesses and Copper Foil Cladding Options:

TMM4 laminates are available in various thicknesses and copper foil cladding options, allowing for flexibility in design and manufacturing. The material is compatible with standard PCB fabrication processes, making it easy to incorporate into existing production workflows.

Some Typical Applications

Rogers TMM4 is commonly used in the following applications:

1. RF and microwave circuitry: TMM4 is well-suited for high-frequency circuitry, such as in RF amplifiers, mixers, oscillators, and other components used in wireless communication systems.

2. Power amplifiers and combiners: TMM4’s high thermal conductivity and excellent electrical performance make it a suitable choice for power amplifiers and combiners, where efficient heat dissipation and reliable signal integrity are crucial.

3. Filters and couplers: TMM4 can be utilized in the fabrication of filters and couplers, which are essential components in signal processing and communication systems, including cellular networks and radar systems.

4. Satellite communication systems: TMM4 is used in the construction of satellite communication systems, including antennas, transceivers, and signal processing modules, where high-frequency performance and thermal management are critical.

5. Global Positioning Systems (GPS) antennas: TMM4 is employed in the manufacturing of GPS antennas, which require precise signal reception and transmission capabilities for accurate positioning and navigation.

6. Patch antennas: TMM4 is suitable for patch antennas, which are commonly used in wireless communication applications, including Wi-Fi, Bluetooth, and satellite communication systems.

7. Dielectric polarizers and lenses: TMM4 can be utilized in the fabrication of dielectric polarizers and lenses used in various applications, including radar systems, imaging devices, and optical communication systems.

8. Chip testers: TMM4 can be used in the construction of chip testers, which are used in the semiconductor industry to test and characterize integrated circuits (ICs) for functionality and performance.

Overall, Rogers TMM4 finds applications in a wide range of RF and microwave systems, power amplifiers, filters, antennas, and various testing equipment. Its excellent electrical performance, thermal management capabilities, and compatibility with high-frequency applications make it a popular choice in the electronics industry.

Rogers TMM4 Compared with other High Frequency PCB Materials

Rogers TMM4 is a high-frequency PCB (Printed Circuit Board) material manufactured by Rogers Corporation. When comparing TMM4 with other high-frequency PCB materials, several factors come into play, including electrical properties, mechanical properties, cost, and availability. Here is a general comparison of Rogers TMM4 with some commonly used high-frequency PCB materials:

1. Rogers TMM4:

●Dielectric Constant (Dk): Typically around 4.0.
●Dissipation Factor (Df): Low loss tangent.
●Temperature Coefficient of Dielectric Constant (TCDk): Low.
●Mechanical Properties: Good dimensional stability, suitable for multilayer constructions.
●Availability: Widely available from Rogers Corporation.
●Cost: Moderately expensive compared to standard FR-4.

2. Rogers RO4000 Series:

RO4350B: Dk around 3.48, low Df, suitable for high-frequency applications.
RO4003C: Dk around 3.38, low Df, optimized for high-volume commercial applications.
RO3003: Dk around 3.0, low Df, suitable for microwave and millimeter-wave applications.
●Mechanical Properties: Good dimensional stability, suitable for multilayer constructions.
●Availability: Widely available from Rogers Corporation.
●Cost: Moderately expensive compared to standard FR-4.

3. DuPont Pyralux:

●Pyralux AP: Dk around 3.4, low Df, flexible material for high-frequency flexible circuits.
●Pyralux AC: Dk around 3.2, low Df, flexible material for high-frequency flexible circuits.
●Mechanical Properties: Flexible and suitable for applications that require bending or conformal shapes.
●Availability: Widely available from DuPont and its authorized distributors.
●Cost: Generally more expensive than standard FR-4 and rigid materials.

4. Isola IS620:

●Dk: Typically around 3.2.
●Df: Low loss tangent.
●Mechanical Properties: Good dimensional stability, suitable for multilayer constructions.
●Availability: Available from Isola and its authorized distributors.
●Cost: Generally more expensive than standard FR-4.

It’s important to note that the specific electrical and mechanical properties can vary within each material series and are often customizable based on the application requirements. Additionally, the cost and availability of these materials may vary depending on your location and supplier. It is recommended to consult with the PCB material manufacturers or authorized distributors to get the most up-to-date and accurate information for your specific project.


In the realm of high-frequency electronic design, the choice of materials plays a pivotal role in achieving optimal performance. Rogers TMM4 laminate stands out as a game-changer, delivering unparalleled electrical and mechanical properties. Its superior thermal stability, resistance to moisture, and dimensional accuracy make it an ideal choice for high-frequency multilayer circuits. With Rogers TMM4, designers can unlock new possibilities, pushing the boundaries of innovation in high-frequency applications. Embracing the power of Rogers TMM4 laminate, electronic designers can confidently embark on their journey towards achieving excellence in high-frequency design.

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