Information Technology Reference
In-Depth Information
10
10
8
5
6
4
0
2
-5
0
-2
-10
-4
-6
-15
-8
-20
-10
-100
-50
0
50
100
-100
-50
0
50
100
Elevation Angle (deg)
Elevation Angle (deg)
Fig. 10.
2-D elevation pattern of E-
Total's gain at phi=0
o
Fig. 11.
2-D elevation pattern of E-
Total's gain at phi=90
o
The microstrip line length and width of 50
ʩ
, 100
ʩ
are calculated using
lincalc [6]. The microstrip line with a width of 0.4 mm has a length of 2.78 mm
and is of 100
ʩ
whose values were calculated from lincalc. The microstrip line
with a width of 2.5 mm has a length of 33 mm. The microstrip line with a width
of 1.2 mm has a length of 17.7 mm as shown in Fig. 5. The simulation results
provide VSWR = 1.014 and
S
11
= -43.28 dB as shown in Fig. 6 and Fig. 7,
respectively. The value of
S
11
is less than -15 dBm and the value of VSWR is
less than 2. Hence the attained result will provide a good impedance matching
to the 50
ʩ
load. The 2-D radiation pattern of the antenna is normal to the
surface as shown in Fig. 8. The gain attained is 7.3 dBi with a directivity of 9.6
dBi and a 3 dB Beam Width of 59
.
8
o
in E-plane. Based on the gain, directivity,
and 3 dB beam width attained, it provides a narrow beam with a high gain. Fig.
8 and Fig. 9 show that the 2-D elevation pattern of directivity of total electric
field in
phi
=0
o
and 90
o
, respectively.
Based on Fig. 8 and Fig. 9, the radiation pattern for directivity is normal
to the surface with a gain of 9.6 dBi. Fig. 10 and Fig. 11 show that the 2-D
elevation pattern of gain of total electric field in
phi
=0
o
and 90
0
, respectively.
Based on the Fig. 10 and Fig. 11, the radiation pattern for the gain is normal
to the surface with a gain of 7.3 dBi.
5Con lu on
In this paper, a 2x2 directional microstrip patch antenna has been proposed.
This antenna is based on a single microstrip patch antenna which is arranged
in a 2x2 matrix fashion to facilitate directive radiation pattern. The proposed
antenna exhibits the gain of 7.3 dBi and directivity of 9.6 dBi. To provide bet-
ter insight, the attained simulation results are compared with similar antennas
made on RT/Duroid 4003C [12] and on RT/Duroid 5880 [1]. The comparison
is tabulated in Table 1. It is clear from Table 1 that a thick substrate with a
