Temperature compensated high-dielectric-constant thermoplastic microwave materials

Frequency-temperature compensation mechanism for bismuth based dielectric/PTFE microwave composites

“…In these properties, temperature coefficient of frequency (τ f ) has received intensive attention for reducing temperatureinduced drift. The τ f depends both on the coefficient of thermal expansion (CTE) and the dielectric constant of temperature coefficient (a " ) [3][4][5]. However, polymer, widely used in packaging and substrates, has the main disadvantages of its high linear CTE and large negative a " .…”

“…However, polymer, widely used in packaging and substrates, has the main disadvantages of its high linear CTE and large negative a " . A mechanism for the temperature compensation of τ f in polymer composites has been obtained by introducing ceramic filler with a different a " into polymer matrix [3]. For efficient filling of polymers by ceramics filler with different dielectric properties, high dielectric constant microwave composites with near-zero τ f can be achieved and it would be an effective way to reduce CTE and a " [6].…”