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High-Performance Ultra-Wideband
Planar Antenna Design
翁 金 輅 (Kin-Lu Wong)
國立中山大學電機系
Dept. of Electrical Engineering
National Sun Yat-Sen University
Kaohsiung, Taiwan
E-mail: wongkl@ema.ee.nsysu.edu.tw
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NSYSU, Taiwan
Wireless Communication
Systems and Standards
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NSYSU, Taiwan
Operating Systems and
UWB Planar Antennas
n UWB, short-range communications, 3.1~10.6 GHz
Systems with BW > 1.5 GHz or > 25%
n WMAN (IEEE 802.16a, fixed wireless, 2~11 GHz;
IEEE 802.16e, mobile wireless, 2~6 GHz)
n UWB access-point (AP) antennas
n Planar metal-plate monopole antennas
n Printed monopole antennas
n UWB antennas for mobile units
n UWB mobile phone antennas (internal or stubby
monopole)
n UWB internal laptop antennas
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NSYSU, Taiwan
UWB AP Antennas-
Planar metal-plate monopoles (1)
2:1 VSWR BW larger than 10 GHz (covering
3.1~10.6 GHz or 2~11 GHz) can be obtained 4
NSYSU, Taiwan
UWB AP Antennas-
Planar metal-plate monopoles (2)
Considerations of UWB radiation characteristics:
(1) Vertical polarization purity (suppressing horizontal currents)
(2) Stability of omni radiation pattern across the UWB band 5
NSYSU, Taiwan
UWB AP Antennas-
Planar monopoles and quasi-dipoles
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NSYSU, Taiwan
UWB/802.16a AP Antenna-
Square planar monopole with notches (1)
0
-10
-20
-30
-40
1E+009 5E+009 9E+009 1.3E+010
BW: 10.7 GHz (2.0~12.7 GHz), 10 dB RL
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NSYSU, Taiwan
UWB/802.16a AP Antenna-
Square planar monopole with notches (2)
Unmarked curves: Measured
Marked curves: Simulated
Simulated 3D pattern (HFSS)
Notch: w = 7 mm, h = 3 mm, d = 1.5 mm 8
NSYSU, Taiwan
UWB/802.16a AP Antenna-
Square planar monopole with notches (3)
Unmarked curves: Measured
Marked curves: Simulated
Simulated 3D pattern (HFSS)
Notch: w = 7 mm, h = 3 mm, d = 1.5 mm 9
NSYSU, Taiwan
UWB/802.16a AP Antenna-
Square planar monopole with notches (4)
Unmarked curves: Measured
Marked curves: Simulated
Notch: w = 7 mm, h = 3 mm, d = 1.5 mm 10
UWB AP Antenna-
NSYSU, Taiwan
Square planar monopole with
trident-shaped feeding strip (1)
BW: 10 GHz (1.4~11.4 GHz), 10 dB RL
Improved BW and polarization purity
0
-10
-20
-30
-40
0 3E+009 6E+009 9E+009 1.2E+010
Feeding strip type t, h, d (mm) BW, fL ~ fU (GHz) fU/fL
Trident strip 15, 3.5, 1.0 10.1, 1.4 ~ 11.5 8.2
Two-branch strip 15, 3.5, 1.0 8.8, 1.4 ~ 10.2 7.3
Simple strip ---, ---, 2.5 1.9, 1.4 ~ 3.3 2.3
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UWB AP Antenna-
NSYSU, Taiwan
Square planar monopole with
trident-shaped feeding strip (2)
Measured radiation patterns at 2 and 6 GHz
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UWB AP Antenna-
NSYSU, Taiwan
Square planar monopole with
trident-shaped feeding strip (3)
Gain: 4-7 dBi across the band
Measured radiation patterns at 10 GHz
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NSYSU, Taiwan
UWB AP Antenna-
Step-shaped planar monopole (1)
0
-10
-20
d = 2 mm
-30
1E+009 2E+009 3E+009 4E+009 5E+009 6E+009 7E+009
Azimuthal pattern
BW: 4.4 GHz (2.2~6.6 GHz), 2:1 VSWR
Improved omni pattern across the band
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NSYSU, Taiwan
UWB AP Antenna-
Step-shaped planar monopole (2)
Measured radiation patterns at 3 and 6 GHz
Good omni pattern across the band
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NSYSU, Taiwan
UWB AP Antenna-
U-shaped planar monopole
0
-10
-20 L = 25 mm, W = 11 mm,
t = d = 4 mm
-30
1E+009 3E+009 5E+009 7E+009 9E+009
0
-10
-20
BW: 5.1 GHz (2.0~7.1 GHz), 2:1 VSWR -30
1E+009 3E+009 5E+009 7E+009 9E+009
Improved omni pattern across the band
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NSYSU, Taiwan
UWB AP Antenna-
Cylindrical planar monopole (1)
A cross patch used for fabricating the antenna
BW: 4.7 GHz (1.9~6.6 GHz), 2:1 VSWR
Improved omni pattern across the band
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NSYSU, Taiwan
UWB AP Antenna-
Cylindrical planar monopole (2)
Gain variations < 1.5 dB across the band 18
NSYSU, Taiwan
UWB AP Antenna-
Cross-plate monopole
BW: ~10 GHz (1.8~11.9 GHz), 10-dB RL
Improved omni pattern across the band
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NSYSU, Taiwan
UWB AP Antenna-
Tri-plate monopole
BW: ~10 GHz (2.7~12.9 GHz), 10-dB RL
Improved omni pattern across the band
0
-10
-20
-30
1E+009 4E+009 7E+009 1E+010 1.3E+010
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NSYSU, Taiwan
UWB AP Antenna-
Band-notched UWB planar monopole (1)
By incorporating a suitable (slot or slit) structure to be a half-wavelength at the
desired notched frequency, a destructive interference could take place, causing the
UWB antenna non-responsive at that frequency -- Band-notched characteristic
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20
15
10
5
0
2E+009 4E+009 6E+009 8E+009 1E+010 1.2E+010
BW covering 3.1 ~ 10.6 GHz with a
notched frequency band at 5 GHz
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NSYSU, Taiwan
UWB AP Antenna-
Band-notched UWB planar monopole (2)
25
20
15
10
5
0
2E+009 4E+009 6E+009 8E+009 1E+010 1.2E+010
Slot length = 2L + W -2t
L = 11 mm, W = 9 mm, t = 2 mm
Slot length = 27 mm ~ 0.5λ at 5.5 GHz
L = 11 mm
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NSYSU, Taiwan
UWB AP Antenna-
Band-notched UWB circular monopole
15
10
5
0
1E+009 4E+009 7E+009 1E+010 1.3E+010
15
10
5
BW covering 3.1 ~ 10.6 GHz, with the
notched frequency band controlled by 0
1E+009 4E+009 7E+009 1E+010 1.3E+010
the slot length
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NSYSU, Taiwan
UWB AP Antenna-
Band-notched UWB slot antenna
10
8
6
4
2
0
2E+009 4E+009 6E+009 8E+009 1E+010 1.2E+010
BW covering 3.1 ~ 10.6 GHz, with the
notched frequency band controlled by
the U-slot length in the tuning stub
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NSYSU, Taiwan
UWB Printed Antenna-
Diversity printed monopoles
BW: 5.4 GHz (2.3–7.7 GHz), 10 dB RL;
Good port isolation (S21 < –20 dB)
across the band;
Gain: about 3.5 dBi in 2.4/5.2/5.8 GHz
bands
0
-10
-20
-30 PCMCIA card
-40
-50
-60
2E+009 3E+009 4E+009 5E+009 6E+009 7E+009 8E+009
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NSYSU, Taiwan
UWB Mobile Phone Antenna-
Internal metal-plate monopole
BW: 6 GHz (1.9~7.9 GHz), 10 dB RL
Suitable for UMTS/WLAN (2.4/5.2/5.8 GHz) operations
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NSYSU, Taiwan
UWB Mobile Phone Antenna-
Stubby cylindrical monopole
Antenna comprises an upper hollow conducting cylinder
and a lower conducting cone
BW: 8.8 GHz (1.8~10.6 GHz), 10 dB RL
Suitable for UMTS/WLAN (2.4/5.2/5.8 GHz)
operations or UMTS/UWB operations
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NSYSU, Taiwan
UWB Laptop Antenna-
Shorted planar monopole
BW: ~4 GHz (2.1~6.0 GHz), 10 dB RL
W = 36 mm, L = 14 mm, t = 3 mm
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NSYSU, Taiwan
Conclusion
n UWB planar antennas for access-
points and mobile-units applications
have been presented
n Planar antennas are good
candidates for UWB communication
applications
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NSYSU, Taiwan
Thanks for Your Attention!
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