investigation of a curtain antenna array for tiger quang nguyen, dr john devlin electronics...
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Investigation of a Curtain Antenna Array for TIGER
Quang Nguyen, Dr John DevlinElectronics Engineering Dept
La Trobe University
Australia
Problems of currently used antennas
• Structural problem
1. Broken long elements (wind 47 m/s)
2. Tower bent along wind direction
3. Twisted of horizontal boom
• Questioning of antenna performance
Objectives
• Modification of the Log periodic antenna to achieve a robust structural that requires minimal maintenance.
• Implementation of frequency independent array to ensure a broadband operation.
0.80.85
0.9
0.95tau
0.050.1
0.150.2
0.25sigma
0
10
20
30
40
alpha
0.80.85
0.9
0.95tau
Possibility of compact LPDA
41
tan 1
n
n
ll 1
n
nn
l
s
21,
1, nns
nl
0 5 10 15 20 25 30 35
0.5
1
1.5
2
2.5
3
3.5
4
L
Bs = 3.46
Bs = 2
L/Alpha/Bs relationship
A Different Approach
12,1
11
NL
s
0.8 0.85 0.9 0.95 1
5
10
15
20
25
30
35
n
Bs = 3.46
Contour lines of s1/L
L/1s gnisaercnI
Bs/Tau/N/S1/L relationship
Broaden Structure Bandwidth
Control of electrical height