The Shengyi S7349G, branded as mmWave77, is a high-frequency, low-loss material designed for RF/Microwave applications, particularly effective in environments requiring stable electrical properties across a broad frequency range (1 GHz to 100 GHz) and temperature spectrum (-55℃ to +150℃). This material is characterized by a low dissipation factor (0.0010 at 10 GHz) and a controlled dielectric constant (Dk) of 3.0 ± 0.04, making it highly suitable for precision applications where minimal signal loss and consistent dielectric properties are critical.

For constructing a PCB stackup using mmWave77, consider the following guidelines:

• Utilize mmWave77 in applications requiring excellent dimensional stability, chemical resistance, and low moisture absorption. Its properties make it ideal for automotive radar, cellular telecommunications, and satellite communication systems.
• Ensure compatibility with other PCB materials and processes, as mmWave77 offers excellent copper peel strength and is rated UL 94 V-0 for flame resistance, supporting robust and safe designs.
• Take advantage of the material's low passive inter-modulation (-165 dBc), which is crucial for systems where signal integrity and minimal interference are paramount.

When designing the PCB, it's important to consider the thermal management aspects due to the material's coefficient of thermal expansion (CTE) values of 16 ppm/℃ in the X and Y directions and 22 ppm/℃ in the Z direction, which ensures the material's stability under thermal stress. The thermal conductivity of 0.50 W/m/°K also supports effective heat dissipation. These properties, combined with a high decomposition temperature (Td) of 538 ℃, make mmWave77 an excellent choice for high-reliability applications in harsh environments.