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Wireless Technology Lab., Kyung Hee UniversityWireless Technology Lab., Kyung Hee University
S-band Patch Antenna Design for CINEMA
Chungju Kimkimcj@khu.ac.kr
Wireless Technology Lab., Kyung Hee University
Design Goal
- S-Band Patch Antenna
Size 80 X 80 mm
Bandwidth 60 MHz (2.185~2.245 GHz)
Antenna Polariza-
tion
Right Hand Circular Polariza-tion (RHCP)
RHCP Gain Over 5 dBic
Axial Ratio Below 3 dB
Wireless Technology Lab., Kyung Hee University
Antenna Polarization(1)
- What is the Antenna Polarization The polarization of an antenna is the direction of the electric field (E-plane) of
the radio wave with respect to the Earth's surface and is determined by the phys-ical structure of the antenna and by its direction.
Vertical Polarization
Horizontal Polarization
LH Circular Polarization
RH Circular Polarization
Wireless Technology Lab., Kyung Hee University
Antenna Polarization(2)
- Why use the CP antenna for CINEMA? Space communication has forced the use of Circular polarization. The funda-mental advantage of circular polarization is that all reflections change the direc-tion of polarization, precluding the usual addition or subtraction of main and re-flected signals. Therefore there is far less fading and flutter when circular polar-ization is used at each end of the link.
Wireless Technology Lab., Kyung Hee University
Antenna Polarization(3)
Wireless Technology Lab., Kyung Hee University
Rectangular Patch antenna(1)
- Geometryw
a
w
t
t
/ 2w
38.35
7.9
10.175
w mm
t mm
a mm
Wireless Technology Lab., Kyung Hee University
Rectangular Patch antenna(2)
- S-parameter
- Bandwidth(-10 dB)
EM 69 MHz (2.187~2.256 GHz)
Meas. 130 MHz (2.119~2.249 GHz)
Wireless Technology Lab., Kyung Hee University
Rectangular Patch antenna(3)
- Axial Ratio(Meas.)
<xz-plane>
<yz-plane>
xz-plane 24 MHz (2.145~2.169 GHz)
yz-plane 21 MHz (2.155~2.176 GHz)
- Axial Ratio below the 3 dB
Wireless Technology Lab., Kyung Hee University
Rectangular Patch antenna(4)
- Radiation Pattern(Meas.)
<xz-plane>
<yz-plane>
RHCP Gain
6.056 dBic
LHCP Gain
-14.03 dBic
- Max. CP Gain at 2.160 GHz
RHCP Gain
5.94 dBic
LHCP Gain
-12.52 dBic
- Max. CP Gain at 2.160 GHz
Wireless Technology Lab., Kyung Hee University
1w
1w
Double layer Patch antenna(1)
- Geometry
1
2
35
36.05
13
9.025
w mm
w mm
t mm
a mm
t
t
2w
2wa 2 / 2w
<First Layer> <Second Layer>
Wireless Technology Lab., Kyung Hee University
- S-parameter
Double layer Patch antenna(2)
- Bandwidth(-10 dB)
EM 71.2 MHz (2.164~2.236 GHz)
Meas. 123.8 MHz (2.131~2.254 GHz)
Wireless Technology Lab., Kyung Hee University
Double layer Patch antenna(3)
- Axial Ratio(Meas.)
<xz-plane>
<yz-plane>
xz-plane Out of range
yz-plane Out of range
- Axial Ratio below the 3 dB
Wireless Technology Lab., Kyung Hee University
Double layer Patch antenna(4)
<xz-plane>
<yz-plane>
- Radiation Pattern(Meas.)
RHCP Gain
6.447 dBic
LHCP Gain
-1.931 dBic
- Max. CP Gain at 2.205 GHz
RHCP Gain
6.273 dBic
LHCP Gain
-8.186 dBic
- Max. CP Gain at 2.205 GHz
Wireless Technology Lab., Kyung Hee University
Double-fed Patch antenna(1)
- Geometry
<First Layer> <Second Layer>
Wireless Technology Lab., Kyung Hee University
- S-parameter(EM Simulation)
Double-fed Patch antenna(2)
- Bandwidth(-10 dB)
EM 70 MHz (2.19~2.26 GHz)
Wireless Technology Lab., Kyung Hee University
Double-fed Patch antenna(3)
<xz-plane>
<yz-plane>
- Radiation Pattern(EM Simulation)
RHCP Gain
7.49 dBic
LHCP Gain
-13.542 dBic
- Max. CP Gain at 2.2 GHz
RHCP Gain
7.49 dBic
LHCP Gain
-13.542 dBic
- Max. CP Gain at 2.2 GHz
Wireless Technology Lab., Kyung Hee University
SUMMARY
Rectangular Patch
Antenna
Double layer Patch
Antenna
Double-fed Patch
Antenna
EM Meas. EM Meas. EM Meas.
Center Frequency2.211
GHz
2.184
GHz
2.20
GHz
2.192
GHz
2.225
GHz-
Reflection coeffi-
cient bandwidth
69
MHz
130
MHz
71.2
MHz
123.8
MHz70MHz -
Polarization type RHCP RHCP RHCP RHCP RHCP -
Circular Polariza-
tion Gain7.26dBic 6.00dBic 7.45dBic 6.36dBic 7.49dBic -
Minimum Axial
Ratio
(Frequency)
1.52dB
(2.215
GHz)
1.73dB
(2.16
GHz)
0.932dB
(2.215
GHz)
3.34dB
(2.205
GHz)
0.82
(2.2
GHz)
-
Recommended