UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.
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Transcript of UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.
![Page 1: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/1.jpg)
UWB Antenna
Ryan ClarkeRoshini Karunaratne
Chad Schrader
Advisor: Ray Kwok
![Page 2: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/2.jpg)
Objectives
• Design UWB antenna for hand held communication device (walkie-talkie)
• Use Iterative simulation to arrive at design
![Page 3: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/3.jpg)
Specifications
• 225 – 400 MHz
• VSWR < 1.5 : 1
• Efficiency > 75%
• Proximity Insensitive
• Broadband
![Page 4: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/4.jpg)
Design Issues
• Small enough for a handheld device
(H = 10”, W = 3”, T = 1”)
• Broadband
• High Bandwidth factor (~70%)
• Non-dispersive
![Page 5: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/5.jpg)
Antenna TopologiesConsidered
• Diamond Dipole
• PIFA (Planar Inverted-F Antenna)
• Dual L-shaped Monopole
![Page 6: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/6.jpg)
Diamond Dipole
• Poor frequency response for 225 – 400 MHz
• Dimensions too big
![Page 7: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/7.jpg)
PIFA
• Poor frequency response for 225 – 400 MHz
• Dimensions too big
![Page 8: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/8.jpg)
Dual L-Shaped Monopole(Success!)
• VSWR < 1.9 for 270 – 400 MHz• Efficiency• Omni-directional
![Page 9: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/9.jpg)
Simulation Results
• Optimized dimensions
• VSWR
• Radiation Pattern
• E-fields and H-fields
![Page 10: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/10.jpg)
Optimized Dimensions
• Dimensions optimized by simulation software
• H = 236mm, 9.3in
• W = 31.5mm, 1.24in
• Pipe diameter, d = 7.5mm, 0.3in
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![Page 12: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/12.jpg)
VSWR
• VSWR < 1.9 for 270.9 – 404.3 MHz
• VSWR < 1.5 not achieved
• Mid-band VSWR minimum is ~ 1.7
![Page 13: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/13.jpg)
![Page 14: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/14.jpg)
Radiation Pattern
• Omni-directional
• f = 225 MHz, Gain[phi] = 5.2 dB
• f = 350 MHz, Gain[phi] = 6.0 dB
• f = 400 MHz, 3.5 dB < Gain[phi] < 6.9 dB
![Page 15: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/15.jpg)
F = 225 MHz
![Page 16: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/16.jpg)
F = 225 MHz
![Page 17: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/17.jpg)
F = 350 MHz
![Page 18: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/18.jpg)
F = 350 MHz
![Page 19: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/19.jpg)
F = 400 MHz
![Page 20: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/20.jpg)
F = 400 MHz
![Page 21: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/21.jpg)
E-Fields and H-Fields
• Distribution at corners
• Surface current
• Proximity sensitivity
![Page 22: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/22.jpg)
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![Page 25: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/25.jpg)
Construction
• Copper pipe– Best available conductor
• Ground plane– Large as possible (can’t do infinite)
• Insulators
– Lowest εr, rubber (εr = 2)
• Coaxial cable and connectors– APC7, N-type
![Page 26: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/26.jpg)
Costs
• Copper tube, $12/ft.
• Ground plane, $5-$10
• Mounting hardware, $2
• Total Cost, $30 - $35
![Page 27: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/27.jpg)
Testing
• Network analyzer >>> return loss curve
• Proximity sensitivity
• Radiation pattern
![Page 28: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/28.jpg)
Conclusion
• Simulated double-L monopole antenna
• Simulation results encouraging
• Prototype construction in progress
![Page 29: UWB Antenna Ryan Clarke Roshini Karunaratne Chad Schrader Advisor: Ray Kwok.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f185503460f94c2ecf9/html5/thumbnails/29.jpg)
The End.
Questions?