Rogers TMM4 PCB - High-Performance Microwave Material for Advanced Applications
1.Introduction to TMM4
Rogers TMM4 is a thermoset microwave material composed of a ceramic and hydrocarbon polymer composite. This innovative laminate is engineered for high reliability in plated-thru-hole applications, including strip-line and micro-strip designs. TMM4 combines the advantages of traditional PTFE laminates with strong mechanical and chemical properties, eliminating the need for specialized production techniques.
2.Features of TMM4
Dielectric Constant (Dk): 4.50 ± 0.045
Dissipation Factor: 0.0020 at 10GHz
Thermal Coefficient of Dk: 15 ppm/°K
Matched Coefficient of Thermal Expansion:
X: 16 ppm/°K
Y: 16 ppm/°K
Z: 21 ppm/°K
Decomposition Temperature (Td): 425 °C (TGA)
Thermal Conductivity: 0.7 W/mK
Moisture Absorption: 0.07% - 0.18%
Thickness Range: 0.0015 to 0.500 inches (± 0.0015 inches)
3. PCB Construction Details
汽水| Parameter | Details |
| Base Material | TMM4 |
| Layer Count | 2 layers |
| Board Dimensions | 45mm x 54mm (1 PCS, ± 0.15mm) |
| Minimum Trace/Space | 4/6 mils |
| Minimum Hole Size | 0.3mm |
| Blind Vias | None |
| Finished Board Thickness | 1.3mm |
| Finished Copper Weight | 1oz (1.4 mils) on outer layers |
| Via Plating Thickness | 20 µm |
| Surface Finish | Immersion Gold |
| Top Silkscreen | White |
| Bottom Silkscreen | None |
| Top Solder Mask | Blue |
| Bottom Solder Mask | None |
| Electrical Testing | 100% before shipment |
4. PCB Stackup
汽水| Parameter | Details |
| PCB Stackup | 2-layer rigid PCB |
| Copper Layer 1 | 35 μm |
| Rogers TMM4 Core | 1.27 mm (50 mil) |
| Copper Layer 2 | 35 μm |
5.PCB Statistics
Components: 11
Total Pads: 20
Thru Hole Pads: 8
Top SMT Pads: 12
Bottom SMT Pads: 0
Vias: 51
Nets: 2
6.Accepted Standards
Artwork Format: Gerber RS-274-X
Quality Standard: IPC-Class-2 compliant
Availability: Worldwide production and shipping
7.Benefits of TMM4
Exceptional mechanical properties that resist creep and cold flow
High resistance to process chemicals, minimizing fabrication damage
Reliable wire-bonding capabilities due to thermoset resin composition
Enhanced reliability of plated-thru holes
Compatibility with all common printed wiring board (PWB) processes
8.Typical Applications
RF and microwave circuitry
Power amplifiers and combiners
Filters and couplers
Satellite communication systems
Global Positioning System (GPS) antennas
Patch antennas
Dielectric polarizers and lenses
Chip testers
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