资料介绍
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
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(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
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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