资料介绍
天線簡介Zin = Zo l Zin Z0:S§ Zin:é¤J§ ] :ì±`,P°TifY°] = 2 l:é× ZL
ZL + jZ0tan(] Z0 + jZLtan(]
l) l)
/f
= §CW°Ti¤jóéu×A
3*108 103 4
= 1.5 105 ¤ l/f~=0
§Y]l=0 Atan(]l)0AGZin =ZL Gb¤R§CWqAiH¤{éu
W R > 3W
a=1.8W
Douter Z0 =
138
log
Douter Dinner
Dinner
OutersuU¨hRadiationU ¤jAy¨insertion loss U¤jA suU±K¨insertion loss U¤p
RF Connectors Impedance
Z0 = 60lnD/d
RF Connector¤W-v fu = 2c/( k D+d)`
L= f / 4 Zin Require Z0 f Zin = Z0 f
/4 /4
ZL = ZinZL
/4
Apply to real loads and sources Perfect match at spot frequency(10%-20% useable bandwidth)
ZL + jZ0 f Z0 f
/4
tan(]
l) l)
+ jZLtan(]
] Z0 f
l=(2
/4=
)(f /4)= ZinZL
Impedance Match Rule
¨pL
êpL
¨pqe
êpC
Sleeve Dipole Antenna
The current distribution of sleeve antenna is like the dipole antenna
Dipole A