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



Topics

Introduction and Background



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



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


Printed two-element CPW folded slot antenna array on 2 mil Kapton substrate



Prototype antenna diagram with a bend angle of ϕb on a conformal surface (wedge)



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°



in x-z plane in y-z plane



Prototype antenna diagram with a bend angle of ϕb on a conformal surface (wedge)



Comparison of the

measured normalized

field pattern in the x-z

plane on a conformal

surface with ϕb =

0°



Comparison of the

measured normalized



surface with ϕb =

30°



Comparison of the

measured normalized



surface with ϕb =

45°

Proposed Design GuidelinesNORTH DAKOTA STATE UNIVERSITY


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



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



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



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.



Questions?



Thank you for listening!

A Conformal CPW Folded Slot Antenna Array Printed on a Kapton Substrate Masud A. Aziz Sayan Roy*...

Documents

Transcript of A Conformal CPW Folded Slot Antenna Array Printed on a Kapton Substrate Masud A. Aziz Sayan Roy*...