Transcript Aperture-coupled Coplanar Patch Antenna

Aperture-coupled Stacked
Coplanar Patch Antenna
Presented by: Mohamed Morsy
Date: October 19,2006
Aperture coupled antenna
Recent developments related to aperture
coupled microstrip antenna
• Demonstrated impedance bandwidths ranging from 5% to 50%
• Independent selection of antenna feed substrate material
• Two layer construction shields radiating aperture from feed
network
• Increased substrate space for antenna elements and feed line
• Convenient integration for active arrays
• Theoretically zero cross polarization in principle planes
Back radiation and enhanced
bandwidth width conflict
• By coupling the resonant patch to the slot
near its resonant will result in increased
bandwidth
• But this technique induces high back
radiation
• The reason is due to the proximity of the
resonance of the slot that radiates on both
sides of the ground plane
Stacked Slot –Coupled Microstrip
Antenna
• In order to overcome that
problem we use stacked
patches
• In this case the resonance of
the slot is chosen to be far
from the resonance of the
patch
Coplanar Patch Antenna
• The coplanar
waveguide, compared
with the microstrip line,
has advantages
• such as low radiation
loss, less dispersion,
uniplanar configuration
Aperture-Coupled Coplanar Patch
Antennas
•
•
•
CPA has almost the same
performance as a MPA, or even
better performance, if it is fed
by
an aperture cut on its
background. It is known that the
surface wave modes in the
substrate have influences on the
performances of an aperturecoupled microstrip patch
antenna,
so we usually hope to suppress
the surface wave modes excited
in the substrate to improve the
performance of an antenna.
S11
VSWR
Bandwidth(10.2GHz-10.7GHz)
Radiation efficiency
Radiation
efficiency=.95
Radiation Pattern
Stacked slot coupled coplanar patch
antenna
Top view
Є1=6.15 , Є2=
Є3=2.2
Side View
S11
Radiation Pattern
Radiation efficiency
Max Radiation efficiency=.962 ,Peak
gain=1.6043 ,Peak directivity=1.6679
Conclusion
• Using stacked slot coupled printed antennas resolve
the conflict between enhanced bandwidth and back
radiation
• Using coplanar patch antenna in addition to stacked
coupled layers gives more improvement in terms of
low radiation loss and less dispersion
Hence increasing antenna efficiency, diving better front
to back ratio
Future Work
• Designing(4-bits) integrated phase shifter
• Constructing aperture-coupled stacked
coplanar patch antenna array
• Building high performance active array
antenna
THANK YOU
QUESTIONS?