Broadband characterization of low dielectric constant and low dielectric loss CYTUF cyanate ester printed circuit board material

Dielectric constant /spl epsi//sub r/ and broadband dielectric loss tan /spl delta/ measurements were performed for the thermoplastic toughened cyanate ester printed circuit board CYTUF material. Characterization of tan /spl delta/ over the 1-8 GHz frequency range was made using a simple short-pulse propagation technique. All the measurements were taken on four-metal-layer, 23/spl times/36 cm cards with representative transmission line structures. It was found the /spl epsi//sub r/=3.48-3.64 and tan /spl delta/=0.0095-0.01, which are much lower than for standard FR-4 material. The impact of improved characteristics on wireability is analyzed through simulations of representative printed circuit board interconnections.