Embed Size (px)
DESCRIPTION
This is power point presentation by a well known researcher on Antenna Design. UWB, short-range communications, 3.1~10.6 GHz
Citation preview
1
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, TaiwanE-mail: [email protected]
NSYSU, Taiwan
2
Wireless Communication Systems and Standards
NSYSU, Taiwan
3
Operating Systems and UWB Planar Antennas
n UWB, short-range communications, 3.1~10.6 GHzSystems 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) antennasn Planar metal-plate monopole antennasn Printed monopole antennas
n UWB antennas for mobile unitsn UWB mobile phone antennas (internal or stubby
monopole)n UWB internal laptop antennas
NSYSU, Taiwan
4
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
NSYSU, Taiwan
5
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
NSYSU, Taiwan
6
UWB AP Antennas-Planar monopoles and quasi-dipoles
NSYSU, Taiwan
7
UWB/802.16a AP Antenna-Square planar monopole with notches (1)
BW: 10.7 GHz (2.0~12.7 GHz), 10 dB RL
1E+009 5E+009 9E+009 1.3E+010-40
-30
-20
-10
0
NSYSU, Taiwan
8
UWB/802.16a AP Antenna-Square planar monopole with notches (2)
Notch: w = 7 mm, h = 3 mm, d = 1.5 mm
Unmarked curves: Measured
Marked curves: Simulated
Simulated 3D pattern (HFSS)
NSYSU, Taiwan
9
UWB/802.16a AP Antenna-Square planar monopole with notches (3)
Notch: w = 7 mm, h = 3 mm, d = 1.5 mm
Unmarked curves: Measured
Marked curves: Simulated
Simulated 3D pattern (HFSS)
NSYSU, Taiwan
10
UWB/802.16a AP Antenna-Square planar monopole with notches (4)
Notch: w = 7 mm, h = 3 mm, d = 1.5 mm
Unmarked curves: Measured
Marked curves: Simulated
NSYSU, Taiwan
11
UWB AP Antenna-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 3E+009 6E+009 9E+009 1.2E+010-40
-30
-20
-10
0
2.31.9, 1.4 ~ 3.3---, ---, 2.5Simple strip
7.38.8, 1.4 ~ 10.215, 3.5, 1.0Two-branch strip
8.210.1, 1.4 ~ 11.5 15, 3.5, 1.0Trident strip
fU/fLBW, fL ~ fU (GHz)t, h, d (mm)Feeding strip type
NSYSU, Taiwan
12
UWB AP Antenna-Square planar monopole with trident-shaped feeding strip (2)
Measured radiation patterns at 2 and 6 GHz
NSYSU, Taiwan
13
UWB AP Antenna-Square planar monopole with trident-shaped feeding strip (3)
Measured radiation patterns at 10 GHz
Gain: 4-7 dBi across the band
NSYSU, Taiwan
14
UWB AP Antenna-Step-shaped planar monopole (1)
BW: 4.4 GHz (2.2~6.6 GHz), 2:1 VSWR
Improved omni pattern across the band
1E+009 2E+009 3E+009 4E+009 5E+009 6E+009 7E+009-30
-20
-10
0
Azimuthal pattern
d = 2 mm
NSYSU, Taiwan
15
UWB AP Antenna-Step-shaped planar monopole (2)
Good omni pattern across the band
Measured radiation patterns at 3 and 6 GHz
NSYSU, Taiwan
16
UWB AP Antenna-U-shaped planar monopole
1E+009 3E+009 5E+009 7E+009 9E+009-30
-20
-10
0
BW: 5.1 GHz (2.0~7.1 GHz), 2:1 VSWR
Improved omni pattern across the band
1E+009 3E+009 5E+009 7E+009 9E+009-30
-20
-10
0
L = 25 mm, W = 11 mm, t = d = 4 mm
NSYSU, Taiwan
17
UWB AP Antenna-Cylindrical planar monopole (1)
BW: 4.7 GHz (1.9~6.6 GHz), 2:1 VSWR
Improved omni pattern across the band
A cross patch used for fabricating the antenna
NSYSU, Taiwan
18
UWB AP Antenna-Cylindrical planar monopole (2)
Gain variations < 1.5 dB across the band
NSYSU, Taiwan
19
UWB AP Antenna-Cross-plate monopole
BW: ~10 GHz (1.8~11.9 GHz), 10-dB RL
Improved omni pattern across the band
NSYSU, Taiwan
20
UWB AP Antenna-Tri-plate monopole
BW: ~10 GHz (2.7~12.9 GHz), 10-dB RL
Improved omni pattern across the band
1E+009 4E+009 7E+009 1E+010 1.3E+010-30
-20
-10
0
NSYSU, Taiwan
21
UWB AP Antenna-Band-notched UWB planar monopole (1)
BW covering 3.1 ~ 10.6 GHz with a notched frequency band at 5 GHz
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
2E+009 4E+009 6E+009 8E+009 1E+010 1.2E+0100
5
10
15
20
25
NSYSU, Taiwan
22
UWB AP Antenna-Band-notched UWB planar monopole (2)
2E+009 4E+009 6E+009 8E+009 1E+010 1.2E+0100
5
10
15
20
25
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
NSYSU, Taiwan
23
UWB AP Antenna-Band-notched UWB circular monopole
1E+009 4E+009 7E+009 1E+010 1.3E+0100
5
10
15
1E+009 4E+009 7E+009 1E+010 1.3E+0100
5
10
15
BW covering 3.1 ~ 10.6 GHz, with the notched frequency band controlled by the slot length
NSYSU, Taiwan
24
UWB AP Antenna-Band-notched UWB slot antenna
2E+009 4E+009 6E+009 8E+009 1E+010 1.2E+0100
2
4
6
8
10
BW covering 3.1 ~ 10.6 GHz, with the notched frequency band controlled by the U-slot length in the tuning stub
NSYSU, Taiwan
25
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
2E+009 3E+009 4E+009 5E+009 6E+009 7E+009 8E+009-60
-50
-40
-30
-20
-10
0
PCMCIA card
NSYSU, Taiwan
26
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
NSYSU, Taiwan
27
UWB Mobile Phone Antenna-Stubby cylindrical monopole
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
Antenna comprises an upper hollow conducting cylinderand a lower conducting cone
NSYSU, Taiwan
28
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
NSYSU, Taiwan
29
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
NSYSU, Taiwan
30
Thanks for Your Attention!
