Fundamentals of Array Antenna
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Transcript of Fundamentals of Array Antenna
Fundamentals of Array Antenna
Antenna Antenna EngineeringEngineering
CHO, Yong HeuiCHO, Yong Heui
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab2
Array antenna
1. Introduction
High gain antenna
Linear array Planar array Conformal array: nonplanar surface, aircraft Phased array
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab3
Microstrip patch antenna
1. Introduction
Single patch antenna
Linear array: series feedingPlanar array: parallel feeding
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab4
Conformal array antenna
1. Introduction
Conformal array: microstrip patch and cavity (Alcatel)
Spot beam of LEO satellite
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab5
Two-element array
2. Array antenna
AF (Array Factor): far field
cos
22
11
21
1ˆsin4
ˆsin4
ˆsin4
21
jkdjkr
jkrjkr
t
ejkr
zeI
jkr
zeIjk
r
zeI
EEE
cos
2cos21AF cos2/cos kd
ee jkdjkd
cos , 21 drrrr
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab6
Array factor
2. Array antenna
AF and element factor Maximum value of AF:
)2/sin(
)2/sin(
1
1
1AF
2/)1(1
0
)1(2
Ne
e
ee
eee
Njj
jNN
n
jn
Njjj
0at N
)2/sin(
)2/sin()(
N
Nf
coskd
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab7
Active integrated antenna
3. Active antenna
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab8
Receiving module for active antenna
3. Active antenna
Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab9
Self structuring antenna
3. Active antenna