High frequency Antenna PCB material The temperature coefficient of dielectric constant (TcDk) is another important parameter, affecting how the Dk value changes with temperature variations, which in turn impacts the antenna's center frequency stability. A lower Dk value is typically preferred for patch antennas to achieve higher center frequencies, while maintaining consistent Dk tolerance is essential for reliable performance. Additionally, other material characteristics like dissipation factor (Df) and substrate thickness play significant roles. While higher Dk values allow for smaller antenna dimensions, they can compromise efficiency and gain. The document emphasizes the trade-offs between substrate thickness and performance, highlighting that thicker substrates may improve radiation efficiency but increase feedline losses. Optimal designs may require multilayer configurations to balance the performance requirements of both the antenna patch and its feedlines.
Read More 
