Super-wideband Antenna Technologies for Next Generation Mobile Systems

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Super-wideband Antenna Technologies for Next
Generation Mobile Systems

• Student Jianjun Liu
• Student ID 41646975
• SupervisorKaru. P. Esselle
• Centre for Microwave and Wireless Applications,
  Electronics Engineering, Macquarie University,
  NSW 2109, Australia

jianjun.liu_at_mq.edu.au
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Outline

• Introduction
• Antenna requirement
• Antenna development and Case study
• Proposed extremely wideband antenna for wireless
  communication Systems
• Conclusion

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Wireless Communication System
-41.3 dBm/MHz maximum power level for UWB
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Examples for existing communication standard

• GPS (1.571.58 GHz)
• WCDMA (1.922.17 GHz)
• Bluetooth (2.4-2.48GHz)
• WLAN 802.11b/g (5.15-5.825)
• WLAN802.11b/g (2.4-2.4835)
• Wi-max (3.3-3.6GHz)
• Commercial UWB (3.110.6 GHz)
• Vehicle UWB radar system(22-29GHz)

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Examples for multi-band wireless system
Cellar system (GSM, Bluetooth, CDMA, USMT)
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• Wireless Local Area Network

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• UWB through wall image operation (0-960MHz)
• Commercial UWB, localization precision(3.110.6
  GHz)
• vehicle UWB radar system(22-29GHz)

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Antenna Requirement

• Key component
• Antenna performance

• Proposal A multiple antennas are implemented
• Each one covers a specific operation spectrum.
• Disadvantage
• Occupy much space for other device
• Increase the system complexity.
• The installation may restrict the system updating
  possibility after manufacture.
• Proposal B Utilize single antenna
• Antenna bandwidth can cover more than one
  operating frequency bands of multiple wireless
  communication systems
• Such antenna should have stable radiation-pattern
  characteristics over entire frequency range.

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Antenna Development
Carters improved match biconical antennas
(1939)
Lodges biconical antennas (1898)
The antennas are bulky and too heavy for portable
device
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Equiangular spiral antenna (1959)
log-periodic dipole antenna (1960)
The movement of the effective radiating region
with frequency results in waveform distortion of
a transmitted pulse
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Metal-plate Monopole Antennas

• Ratio impedance bandwidth 131 Frequency range
  0.8-10.5GHz

J.A. Evans and M.J. Ammann. Planar trapezoidal
and pentagonal monopoles with impedance
bandwidths in excess of 101 C, IEEE Antennas
Propagat. Symp., vol.3, pp. 1558-1561, July,
1999.
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• Frequency range 1.38-11.45GHz Ratio Impedance
  bandwidth 8.31

Kin-Lu Wong, Chih-Hsien Wu, and Saou-Wen Su,
Ultrawide-Band Square Planar Metal-Plate
Monopole Antenna With a Trident-Shaped Feeding
Strip, IEEE Trans. Antennas Propagation,
vol.53, pp1262-1269, April, 2005.
The perpendicular ground plane leads to antennas
with high profiles which is inconvenience for
integrating with monolithic microwave integrated
circuits (MMIC).
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Microstrip-feed Printed Monopole Antenna
Impedance bandwidth ratio 3.521 Frequency
range 2.78-9.78GHz
J. Liang, Choo C. Chiau, X.D. Chen, et al.
Study of a Printed Circular Disc Monopole
Antenna for UWB Systems J.IEEE Trans. Antennas
Propag., 2005, 53(11)3550-3554.
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CPW-fed Printed Monopole Antennas
Impedance bandwidth ratio 4.41 Frequency
range 2.73-12GHz
J. Liang, L. Guo, C.C. Chiau, X. Chen and C.G.
Parini. Study of CPW-fed circular discmonopole
antenna for ultra wideband applicationsJ.IEE
Proc.-Microw. Antennas Propag.,2005,152(6)520-526
.
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Complanation Transform from Discone Antenna

Disc
Elliptical patch
Trapezoid ground plane
Discone

Coaxial-feeding line
CPW feeding line
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Performance for antenna with Trapezoid Ground
Plane
S.-S. Zhong, X.-L. Liang and W. Wang,
Compact elliptical monopole antenna with
impedance bandwidth in excess of 211,IEEE
Trans. Antennas Propagation, vol.55, pp.
3080-3085, November, 2007.
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Performance Comparison between different printed
antenna
tapered
trapeziform
Elliptical
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Characteristic Mode Analysis for Printed Antenna
K. D. Akkerman, T. F. Kennedy, S. A. Long, and J.
T. Williams, "Characteristic modes for planar
structure feed design," in Antennas and
Propagation Society International Symposium, 2005
IEEE, 2005, pp. 503-506 vol. 2B.
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Characteristic Mode Analysis for Printed Antenna
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Modified Coplanar waveguide-fed elliptical
monopole


The feeding terminal affect the high frequency
impedance matching
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Modified Coplanar waveguide-fed elliptical
monopole
With height and width of patch increased, the
lowest limit decrease and ratio bandwidth increase

Width a(mm) b30mm Ratio bandwidthVSWR2 Impedance bandwidth (GHz) VSWR2
a30 25.51 0.98 - 25
a120 531 0.47-25
Height b(mm) a120mm Ratio bandwidthVSWR2 Impedance bandwidth (GHz) VSWR2
b30 531 0.47-25
b90 641 0.39-25
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Modified Coplanar waveguide-fed elliptical
monopole


Gap is a crucial parameter, The gap variation
will affect the impedance bandwidth of whole
spectrum
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Modified Coplanar waveguide-fed elliptical
monopole
Substrate Rogers permitivity3.48,thickness1.5mm
?
b
a
H
Dmax
Measured bandwidth 1.02-24.1 GHz, ratio
bandwidth231
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Modified Coplanar waveguide-fed elliptical
monopole



With the frequency increasing, cross
polarization increased. Reverse current lead to
pattern distortion and horizontal current lead to
cross polarization enhanced.
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Modified Microstrip-fed printed monopole
Based on modified CPW-fed printed monopole, two
modified microstrip-fed monopole are proposed
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Modified Microstrip-fed printed monopole
Antenna type Ratio bandwidth VSWR2 bandwidth (GHz) VSWR2
Ordinary antenna 201 0.47 9.8
Proposed antenna 591 0.47-28
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Modified Microstrip-fed printed monopole
Top side
Measured bandwidth 1.08-27.4 GHz, ratio
bandwidth251
Back side
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Modified Microstrip-fed printed monopole
E Plane H Plane
E Plane H Plane

1. f1.5GHz (b) f5GHz (c) f10GHz
2. (d) f15GHz(e) f20GHz

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Modified Microstrip-fed printed monopole
Maximum gain 6.5 dB Gain variation between 4-20
GHz 2.5 Db
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Modified Microstrip-fed printed monopole
Original proposed antenna Measured
bandwidth 0.85-25 GHz
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Modified Microstrip-fed printed monopole
ordinary tapered proposed
Bandwidth (GHz) VSWR2 2.3-8.1 0.82-8.15 0.82-25
Ratio bandwidth 3.5 9.2 30.5
Input impedance( O ) 18 - 145 22-115 40-79
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Modified Microstrip-fed printed monopole
Top side
Measured bandwidth 0.76-35.2 GHz, ratio
bandwidth461
Back side
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Modified Microstrip-fed printed monopole
E Plane H Plane
E Plane H Plane

1. f1.5GHz (b) f5GHz (c) f10GHz
2. (d) f15GHz(e) f20GHz

Radiation shifting is small
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Modified Microstrip-fed printed monopole
Maximum gain 8.3dB, gain increases in the whole
spectrum
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Conclusion

• Three new configuration of monopole antenna for
  wireless applications
• Four Techniques can enhance BW
• 1 tapered Microstrip-feeding line
• 2 trapezoid ground plane
• 3 optimized radiation patch
• 4 semicircular feeding branch terminal

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Thanks!