A Conformal CPW Folded Slot Antenna Array Printed on a Kapton Substrate Masud A. Aziz Sayan Roy*...
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Transcript of A Conformal CPW Folded Slot Antenna Array Printed on a Kapton Substrate Masud A. Aziz Sayan Roy*...
A Conformal CPW Folded Slot Antenna Array Printed on a
Kapton Substrate
Masud A. AzizSayan Roy*
Layne A. BergeIrfanullah
Sanjay NariyalBenjamin D. Braaten
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Department of Electrical and Computer Engineering
North Dakota State UniversityFargo, ND, USA
• 1) Introduction and Background
• 2) Conformal CPW Folded Slot Array
• 3) Measurement and Simulation Results
• 4) Proposed Design Guidelines
• 5) Conclusion
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Topics
Introduction and Background
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Schematic of the CPW (Co Planar Waveguide) –fed single folded slot antenna [1]:
[1] D. E. Anagnostou and A. A. Gheethan, “A coplanar reconfigurable folded slot antenna without bias network for WLAN applications,”, IEEE Antennas And Wireless Propagation Letters, vol. 8, pp. 1057-1060, Sep. 2009.
Conformal CPW Folded Slot Array
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
b = 5.00 mm,
s = 61.00 mm,
ws = 21.37 mm,
Ls = 43.40 mm,
r = 41.80 mm,
d = 2.00 mm,
g = 0.63 mm,
m = 1.79 mm,
n = 0.71 mm,
Lf = 2.77 mm,
P = 43.5 mm and
Q = 160.5 mm.
Substrate Thickness : 0.05 mmDielectric Permittivity: 2.91
Measurement and Simulation ResultsNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Printed two-element CPW folded slot antenna array on 2 mil Kapton substrate
Measurement and Simulation ResultsNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Prototype antenna diagram with a bend angle of ϕb on a conformal surface (wedge)
Measurement and Simulation ResultsNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
The resonant frequency was measured to be 3.29 GHz with a 10dB bandwidth of 250 MHz for ϕb =0°.
A good impedance match can be observed for each bend angle.
The impedance match of the antenna is essentially independent of ϕb below 45°.
The measured and simulated normalized field patterns on a
conformal surface with ϕb = 0°
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
in x-z plane in y-z plane
Measurement and Simulation ResultsNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Prototype antenna diagram with a bend angle of ϕb on a conformal surface (wedge)
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Comparison of the
measured normalized
field pattern in the x-z
plane on a conformal
surface with ϕb =
0°
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Comparison of the
measured normalized
field pattern in the x-z
plane on a conformal
surface with ϕb =
30°
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Comparison of the
measured normalized
field pattern in the x-z
plane on a conformal
surface with ϕb =
45°
Measurement and Simulation ResultsNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Proposed Design GuidelinesNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
b = 5.00 mm,
s = 61.00 mm,
ws = 21.37 mm,
Ls = 43.40 mm,
r = 41.80 mm,
d = 2.00 mm,
g = 0.63 mm,
m = 1.79 mm,
n = 0.71 mm,
Lf = 2.77 mm,
P = 43.5 mm and
Q = 160.5 mm.
Changed Parameters: ws , Ls , r , one at a time
Changes in Geometry
Proposed Design GuidelinesNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Effect of changes in ws (slot height)
Observation:
S11 can be improvised by
increasing the dimension of
the radiating slot of the
antenna.
Advantage:
A better S11 can be
obtained without changing
the overall dimension of the
antenna
Proposed Design GuidelinesNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Effect of changes in Ls (slot width)
Observation:
A second resonance point
at 2.3 GHz has been found
without any changes of the
default characteristics of
the antenna
Advantage:
Dual-band characteristics
can be achieved without
changing the overall
dimension of the antenna
Proposed Design GuidelinesNORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Effect of changes in r (size of the dipole)
Observation:
The resonance frequency
can be changed by
decreasing the size of the
dipole exciting the radiating
slot of the antenna
Advantage:
The overall radiating frequency
can be decreased without
changing the overall dimension
of the antenna
Conclusion Introduction and Background on the CPW-fed slot
antenna has been discussed.
Conformal CPW-fed slot antenna array has been introduced.
Measurement and Simulation Results are compared for different bend angles of the surface of the antenna.
New design guidelines have been proposed for the improvisation of the antenna characteristics.
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Questions?
NORTH DAKOTA STATE UNIVERSITY
APPLIED ELECTROMAGNETICS LAB
Thank you for listening!