|
Ideal Transmission Line Formulas |
Microwave Bands |
Phase Constant
b |
9LC = w/vp = 2p /l
|
L-Band |
1-2Ghz |
Characteristic
Impedance Z0 |
9L/C
|
S-Band |
2-4GHz |
| Input Impedance Zi |
Z0 (ZL cosb l +jZ0
sinbl)/(ZL cosb l
+jZ0 sinbl)
|
C-Band |
4-8GHz |
| Impedance shorted Line (ZL =0) |
jZ0 tanbl
|
X-Band |
8-12GHz |
| Impedance open Line (ZL = J) |
-jZ0 cotbl
|
Ku-Band |
12-18GHz |
Impedance of Quarter
Wave Line |
Z20 / ZL
|
K-Band |
18-26.5GHz |
Impedance of Half
Wave Line |
ZL
|
Ka-Band |
26.5-40GHz |
|
Reflection coefficient r @ Load
|
(ZL - Z0)
/ (ZL + Z0)
|
|
|
|
Standing-Wave Ratio
|
(1 + lrl) / (1 - lr)
|
1 mil = 25.4 microns
|
1micron = 0.040 mils
|
|
l = wavelength measured along the line.
w = angular frequency.
|
oC = 5/9 * (oF -32)
|
oF = (9/5 oC) + 32
|