Antenna Design Using Ansoft HFSS
Antenna Design Using Ansoft HFSS
Antenna Design Using Ansoft HFSS
The best strategy to design such antenna is to start with planer dipole design from antenna
design Kit With specific operating (Center) Frequency then duplicate the antenna with
specific angle to get an X-shaped antenna.
After Duplicating you need to Assign Boundaries to the parts of the antenna which are
combined to form the X-shaped antenna.
After that check validity of the design then analyze it and see the results, the results may not
have the same specifications that you want, so you need to change the parameters (Dipole
length, Dipole width, Feed Gap length, The angle between the dipoles,.
We have to keep in mind that the bandwidth is defined as the frequency range where S11 is
to be less than -10 dB.
It is preferred to change one parameter or factor at a time to notice the change and the effect
of it so you can guess what should your next adjustment to get the required results.
Let us start with 1.5 GHz Dipole with following parameters then change parameters gradually
The following table contains different trials and adjustments that were performed to get best
results.
Dipole
Dipole
Feed Gap
Angle
Bandwidth
Center
Frequency
Length
Width
length
Between
(MHz)
Frequency
(Antenna
without feed
(Scaled
(Scaled
Dipoles
Design Kit)
(Scaled by)
by)
by)
(degrees)
(GHz)
1.5
0.95
1.5
1.14
45
260
1.5
1.5
0.9
0.9
45
280
1.6
1.5
1.1
1.2
1.32
45
295
1.48
1.5
0.95
0.95
45
295
1.55
1.5
1.05
1.155
45
295
1.49
1.5
0.98
0.98
45
280
1.52
1.5
0.98
1.2
1.176
45
320
1.53
1.5
0.99
0.99
45
310
1.53
1.5
0.98
45
310
1.54
1.5
1.1
45
300
1.46
1.5
0.975
45
300
1.49
1.5
0.975
45
300
1.51
1.5
40
300
1.5
(GHz)
The last trial seems to give the best characteristics and properties; the total scale for each parameter
is the following:
Operating
Dipole
Dipole
Feed Gap
Angle
Bandwidt
Center
Frequency
Length
Width
length
Between
h (MHz)
Frequency
(Antenna
without
(Scaled by)
(Scaled by)
Dipoles
Design Kit)
feed
(GHz)
1.5
(scaled by)
0.914
(GHz)
(degrees)
2.16
1.7
40
300
1.5
ff_2D_GainTotal
4.00
Dipole_Antenna_ADKv1
ANSOFT
Curve Info
dB(GainTotal)
Setup1 : LastAdaptive
Freq='1.5GHz' Phi='0deg'
dB(GainTotal)_1
Setup1 : LastAdaptive
Freq='1.5GHz' Phi='90deg'
2.00
Y1
0.00
-2.00
-4.00
-6.00
-8.00
-200.00
-150.00
-100.00
-50.00
0.00
Theta [deg]
50.00
100.00
Gain = 2.3
dB Red
Radiation
Pattern
150.00
200.00
Radiation
Pattern
(Another
Input Impedance
110
100
90
1.00
80
Dipole_Antenna_ADKv1
70
120
130
ANSOFT
Curve Info
S11
Setup1 : Sw eep1
60
0.50
2.00
50
140
40
150
30
160 0.20
5.00 20
170
10
0.00
180 0.00
0.20
0.50
1.00
2.00
5.00
-170
-10
-160 -0.20
-5.00 -20
-150
-30
-140
-40
-130
-0.50
-2.00
-120
-50
-60
-110
-100
-1.00
-90
-80
-70
Return Loss
0.00
Dipole_Antenna_ADKv1
ANSOFT
Curve Info
dB(S(1,1))
Setup1 : Sw eep1
300
MHz
dB(S(1,1))
-12.50
-25.00
Center Frequency
-37.50
0.75
1.00
1.25
1.50
Freq [GHz]
1.75
2.00
2.25
Return Loss
-5.28
Dipole_Antenna_ADKv1
ANSOFT
Curve Info
dB(S(1,1))
Setup1 : Sw eep1
-7.50
300MHz
-10.00
dB(S(1,1))
-12.50
-15.00
-17.50
-20.00
-22.50
-23.92
1.15
1.25
1.35
1.45
1.55
Freq [GHz]
Zoom
1.65
1.75
1.85
1.90