Investigation of the Novel Capacitively Coupled Patch ...
Transcript of Investigation of the Novel Capacitively Coupled Patch ...
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Master Thesis Presentation
Investigation of the Novel Capacitively Coupled Patch Antenna (CCPA)
for Mobile Communications
By Fei Xie
Supervised by Prof. Dr. -Ing. Klaus Solbach
September 2008
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Contents
Problem Introduction
Modeling and Simulation
Experiment and Result
Conclusion
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Problem Introduction Due to the rapid development of mobile communications
and miniaturization of mobile device, low profile planar inverted-F antennas (PIFA) have replaced the popularly used helical antennas of mobile handsets and systems. The PIFAs normally apply a probe feed which will introduce probe inductance to make impedance match difficult and to bring more spurious radiation in thicker substrate case.
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Capacitively coupled microstrip feed
One novel solution is to use capacitively coupled microstrip feed to replace the probe feed in PIFA. This feed could avoid probe inductance and raise reliability by canceling the drilling and soldering procedure of the probe feed.
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Goal of study
My study here is to use an underneath capacitively coupled microstrip feed to replace probe feed in PIFA on specific substrate. The goal of my study is to find out the design rules to this kind of antenna.
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Modeling and Simulation
• Substrate material – Duroid RT5870 –– Loss tangent 0.0012 at around 1GHz. – Thickness 0.79mm
• Maximal Dimension of CCPA model– Length 82mm– Width 60mm– Height 7mm
33.2=rε
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Configuration of CCPA
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Design Parameters
hhf
cLreffreffr
−=−≈ελ
ε 440
Width of quarter-wave patch
Length of coupled microstrip feed cfL
Width of coupled microstrip feed cfW
Height of air 1h
Length of quarter-wave patch
W
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Reference plane
Reference plane of input impedance
subLL −
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Length of quarter-wave patch
S11(dB) and Input impedance curve of CCPA vs. L
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Width of coupled microstrip feed
cfWS11(dB) and Input impedance curve of CCPA vs.
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Length of coupled microstrip feed
cfLS11(dB) and Input impedance curve of CCPA vs.
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Height of air
1hS11(dB) and Input impedance curve of CCPA vs.
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Width of quarter-wave patch
WS11(dB) and Input impedance curve of CCPA vs.
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W and h1
Resonant frequency and -10dB bandwidth vs. and 1hW
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Lcf and Wcf
Resonant frequency and -10dB bandwidth vs. and cfWcfL
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Lsub and Wsub
Resonant frequency and -10dB bandwidth vs. and subWsubL
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Experiment and ResultExperimental antennas
CCPA PIFA
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S11 of simulated and measured CCPA
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freq, GHzd
B(S
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freq (880.0MHz to 1.000GHz)
Sim
ulat
ed_C
CP
A..S
(1,1
)M
easu
red_
CC
PA
..S(1
,1)
S11
Simulated_CCPA..S(1,1)
Measured_CCPA..S(1,1)
Resonant frequency shift may due to the fabrication inaccuracy
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E-plane Co-polarization of CCPA
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H-plane Co-polarization of CCPA
The simulated and measured radiation patterns are in good agreement.
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S11 of simulated and measured PIFA
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freq, GHzd
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Simulated_PIFA..S(1,1)
Measured_PIFA..S(1,1)
freq (880.0MHz to 1.000GHz)
Sim
ulat
ed_P
IFA
..S(1
,1)
Mea
sure
d_P
IFA
..S(1
,1)
S11
Simulated_PIFA..S(1,1)
Measured_PIFA..S(1,1)
Resonant frequency shift may due to the fabrication inaccuracy
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E-plane Co-polarization of PIFA
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H-plane Co-polarization of PIFA
unsymmetrical pattern may due to the fabrication inaccuracy
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Conclusion[Summary of design rules for CCPA]• A. Decide the limitation to the geometries of whole antenna • B. Select thin and low permittivity substrate for the lower
substrate of CCPA to suppress surface wave loss• C. Choose appropriate arbitrary values for and based
on dimension limitation defined by step A as test dimensions to calculate a trial length
• D. Make multi-parameter sweeping with and to achieve some results versus combinations of parameters, plot their resonant frequency so as -10dB bandwidth and pick up best combination of them.
• E. Make multi-parameter sweeping with and based on decided parameters from above steps, get table of results as step D. Shift the resonant frequency to required range and adjust parameters for best bandwidth
• F. Modify the substrate dimension to achieve possible higher bandwidth (same method in D, E) within the substrate limitation defined in step A
W 1h
W 1h
cfW cfL
L
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Thanks for your attention !