GPS微波介電材料與GPS天線設計概念GPS GPS GPS GPS GPS GPS (Global Position System) Q (Dielectric Quality Factor) (Antenna) (Dielectric Constant) GPS 1995 4 27 GPS GPS GPS GPS GPS 24 3 27 10 15 GPS 1575.42 MHz L1 L2 εr 1227.60 MHz 1575.42 MHz (Polarization) 102 14 http://www.materialsnet.com.tw (a) (εr) Q = Q=1/f α 1/ ε r (b) /Q (c) = f0=εr/2 + (d) (a) (b) (d) (c) E GPS GPS 25mm×25mm 19mm×19mm 13mm×13mm Q Q Q Q=2π 2πWoPT=ωoWo/P Wo= P= 15-25 35-40 80-100 Q GPS 10-100 ωo= T= GPS 2π/ωo GPS a f1 f2 fc Q b Q Q 10,000 http://www.materialsnet.com.tw 14 103 (1) Factor), Qc (Conductor Quality Qc = ω0W 0 Pc Pc 1 = Pc + Pd + Pr Q o ωoW ωoW ωoW = 1 + 1 + 1 Qc Qd Qr Q Q (2) Factor), Qd (Dielectric Quality τf tan δ = σ ωε 0ε r f/f=τfT f= T= Qd = ωoW P ωε0 ∫ E2Dv ωε0 = = σ σ∫ E2dV = 1 tan……