2.11 Transmission lines – Design and Practical Realisation
107
Figure 2.11-5 Characteristic impedance of a coaxial line vs , at b/a = 3.6
Type
Impedance
Core
diameter
(mm)
Dielectric
Type
Dielectric
diameter
(mm)
OD
mm
Application
RG-6/U 75 1.0 mm
PF
(Polyethylene
Foam)
1.64
4.7 6.86
cable television,
satellite television and
cable modems
RG-58/U 50 0.81 mm
PE
(Solid
Polyethylene)
2.3
2.9 5
Radio communication
and amateur radio
RG-213/U 50 7×0.0296 in Cu PE 2.3 7.2 10.3
Radio communication
and amateur radio,
EMC test antenna
cables. Typically lower
loss than RG58
Table 2.11-1 Standard Coaxial Cable Data
Video 2.5 shows how to simulate a coaxial cable with specific dimensions and dielectric
material in Microwave Office. It also shows the effect that changing such dimensions has on the
characteristic impedance of the coaxial transmission line.
0 2 4 6 8 10 12
20
30
40
50
60
70
80
Characteristic Impedance of a Coaxial Line
r
Z
0
,
()
Conquer Radio Frequency
107 www.cadence.com/go/awr
