1) The document presents a compact coplanar waveguide (CPW)-fed circular slot antenna for ultrawideband applications. 2) The proposed antenna design is simple and achieves good performance metrics like impedance matching and stable radiation patterns across the ultrawide bandwidth of 3.1-10.6GHz. 3) The antenna offers advantages like small size, low cost, and high data transmission capabilities making it suitable for various ultrawideband applications including high-speed wireless networks.

1. 3rd International Conference on Artificial Intelligence in Renewable Energetic
Systems
University of Kasdi Merbah Ouargla
Department of Electronic and Telecommunications
Laboratory of electrical engineering (LAGE)
Presented by: ANNOU Abderrahim
Compact CPW-Fed Ultrawideband
Circular Shape-Slot Antenna

2. Outline
•Introduction
 Ultra Wide Band technology
 UWB antenne applications
 UWB frequency range
•Proposed Microstrip Antenna
 Antenna design steps
 CPW-feed technique
 Proposed antenna results
•Conclusion
2IC-AIRES2019, Taghit-Bechar, Algeria

3. Introduction
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Printed antenna
Compact UWB
antenna
Telecommunication Development
Performance improvement
IC-AIRES2019, Taghit-Bechar, Algeria

4. Why microstrip antennas?
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• Low weight and small volume.
• Low fabrication cost
•Allows linear and circular polarization.
• Mechanically robust to mount.
• Capable of dual and triple frequency operations.
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IC-AIRES2019, Taghit-Bechar, Algeria

5. Ultra wide band
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•UWB in the frequency range from 3.1 to 10.6GHz.
•Bandwidth greater than 500 MHz.
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6. UWB applications
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• Stream DVD content to HDTVs
simultaneously.
• Wireless synchronize appliance
clocks.
• Connect high-data rate peripherals.
• Move huge files between digital
cameras, camcorders, and
computers.
• Military applications (radars,
penetrate walls, ….. etc.)
IC-AIRES2019, Taghit-Bechar, Algeria

7. Why UWB ?
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•Low power consumption
•Low detection
•High immunity to multipath-fading
effects
•Ability to penetrate walls
•Faster than Bluetooth, Wi Fi
•Data rate of 450Mbps
IC-AIRES2019, Taghit-Bechar, Algeria

8. Antenna design steps
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Step one: Conventional circular patch with 23.1977 mm radius, calculated
using the following equations:
Step two: miniature hollow circular patch
with 4.2 mm radius.
Step three : round CPW ground plan
IC-AIRES2019, Taghit-Bechar, Algeria

9. Coplanar waveguide(CPW)
• center strip and two ground planes in same the plane.
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Advantages:
 lower dispersion at higher frequencies.
 Broader impedance bandwidth.
 Lower loss than microstrip feed line
IC-AIRES2019, Taghit-Bechar, Algeria

10. Proposed antenna
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L 23 mm
W 18 mm
R-min 4mm
R-
max 4,2 mm
r 2mm
Wf 2,5mm
Lf 7mm
Lg 4,5mm
Wg 4,9mm
• The proposed antenna is fed using CPW technique,
• The results are simulated on CST and validated by HFSS.
• The antenna is fabricated on a FR-4 epoxy substrate with relative
permittivity 4.4 and thickness of 1.6 mm.
• Patch dimensions :
IC-AIRES2019, Taghit-Bechar, Algeria

11. Design steps: Patch Parameters Study
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•Effect of different patch parameters on the return loss of the
proposed antenna
Variation of patch radius R-max Variation of patch radius R-min
on the return loss response on the return loss response
IC-AIRES2019, Taghit-Bechar, Algeria

12. Design steps: Ground Plan Study
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•Effect of ground plan parameters on the return loss of the proposed
antenna
Variation of Wg on the return loss
response
Variation of Lg on the return loss
response
IC-AIRES2019, Taghit-Bechar, Algeria

13. Return loss comparison
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•large frequancy band from 3.1 to 10.6 GHz
Simulated return losses of the proposed antenna
3.1 GHz 10.6 GHz
IC-AIRES2019, Taghit-Bechar, Algeria

14. Gain and Efficency
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• Maximum radiation efficiency 80 %.
• Average gain 3 dBi with maximum peak 3.58 dBi at 8.5 GHz.
Simulated peak antenna gain. Simulated Radiation efficiency.
IC-AIRES2019, Taghit-Bechar, Algeria

15. Radiation pattern
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• Simulated radiation patterns of the proposed antenna at different
frequencies. (a) 3.1 GHz. (b) 6 GHz. (c) 8 GHz. (d) 10.6 GHz.
IC-AIRES2019, Taghit-Bechar, Algeria

16. Comparison with published works
Parameters Dimension
(mm²)
Bandwidth
(GHz)
S11 (dB)
This Work 18x23 (3.1~10.6) -27.5
[R. N Tiwari et al. 2018] 35x30 (3.14 ~11.92) -47.63
[C. Huang et al.2005] 25x20 (2.51~16.48) -34.92
[S. Elajoumi et al. 2017] 26x30 (3 ~ 14.5) -43.5
[M. Karmugil et al. 2017]
55x56 (1.25 ~14.86) -30.08
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IC-AIRES2019, Taghit-Bechar, Algeria

17. Conclusion
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 A compact size CPW-fed ring shaped antenna for UWB
operation is proposed.
 The proposed antenna design is simple, and its performances
have fulfilled the requirement set by UWB communications:
good impedance matching, constant gain, linear phase, stable
radiation patterns over the UWB application.
 UWB is an excellent solution for high-speed WPANs
• Many times the maximum required data rate
• Power efficiency and no multi-path fading.
IC-AIRES2019, Taghit-Bechar, Algeria

18. THANK YOU
IC-AIRES2019, Taghit-Bechar, Algeria
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