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Fundamentals of Array Antenna
Antenna Antenna EngineeringEngineering
CHO, Yong HeuiCHO, Yong Heui
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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
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Antenna Antenna EngineeringEngineering
EM Wave LabEM Wave Lab3
Microstrip patch antenna
1. Introduction
Single patch antenna
Linear array: series feedingPlanar array: parallel feeding
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Antenna Antenna EngineeringEngineering
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Conformal array antenna
1. Introduction
Conformal array: microstrip patch and cavity (Alcatel)
Spot beam of LEO satellite
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Antenna Antenna EngineeringEngineering
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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
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Antenna Antenna EngineeringEngineering
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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
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Antenna Antenna EngineeringEngineering
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Active integrated antenna
3. Active antenna
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Receiving module for active antenna
3. Active antenna
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Self structuring antenna
3. Active antenna