Arlon TC350, a ceramic-filled PTFE and woven fiberglass laminate, is engineered for high-performance microwave printed circuit boards (PCBs), particularly where thermal management and reliability are critical. This material is notable for its excellent thermal conductivity (1.0 W/mK), which is considered best-in-class, and helps in effective heat dissipation and management. This feature is particularly beneficial in applications where heat can adversely affect performance and reliability, such as in power amplifiers and microwave combiners .

The TC350 laminate also boasts a very low loss tangent, which enhances the efficiency of amplifiers and antennas by reducing dielectric loss and insertion loss. This property is crucial for maintaining signal integrity in high-frequency applications. Furthermore, the material's stability in dielectric constant across a wide range of temperatures (-9 ppm/ºC) ensures minimal performance variation with temperature changes, which is vital for applications sensitive to dielectric drift, such as thermally cycled antennas .

From a mechanical perspective, Arlon TC350 is easier to drill compared to traditional commercial laminates and offers high peel strength for reliable copper adhesion, even under thermal stress. This makes it a suitable choice for designs that undergo rigorous physical or thermal testing. Additionally, its low Z-direction coefficient of thermal expansion (CTE) matches that of copper, providing excellent plated through-hole reliability, which is critical for maintaining the structural integrity of vias in PCBs .

Key considerations for using Arlon TC350 in PCB stackup include:

• Utilizing its thermal conductivity for designs requiring high power handling and thermal management.
• Leveraging its low loss tangent and stable dielectric constant for high-frequency or phase-sensitive applications.
• Ensuring mechanical design takes advantage of its ease of drilling and strong copper adhesion properties.
• Considering the use of smooth copper to minimize insertion loss, particularly beneficial at higher RF and microwave frequencies .