2007 IEEE AP-S-Internal UWB Metal-Plate Monopole Antenna for a Wireless USB Dongle

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A novel ultra-wideband (UWB) monopole antenna suitable to be mounted on the printed circuit board (PCB) of a wireless universal serial bus (USB) dongle as an internal antenna is presented. The proposed antenna in the study is a U-shaped metal plate monopole antenna easily fabricated from bending a simple metal plate onto a foam base of a compact size of 6 x 11 x 20 mm3. The antenna mainly comprises a pair of wide-ended radiating arms and a bevelled feeding transition. When the antenna is mounted at the top portion of the PCB, one end of the radiating arm is also short-circuited to the system ground plane. With the proposed antenna structure, which can provide a very wide operating bandwidth of larger than 7.6 GHz, the antenna’s impedance bandwidth can easily cover the 3.1–10.6 GHz UWB band.

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2007 IEEE AP-S-Internal UWB Metal-Plate Monopole Antenna for a Wireless USB Dongle

  1. 1. 2007 IEEE AP-S International Symposium Internal UWB Metal-Plate Monopole Antenna for a Wireless USB Dongle Jui-Hung Chou and *Saou-Wen Su, Ph.D. Technology Research Development Center Lite-On Technology Corp., Taipei, Taiwan *E-mail: stephen.su@liteon.com Jun 14, 2007
  2. 2. Outlines (I) Introduction Conventional UWB antennas Wireless USB scenario (using UWB tech.) (II) Design Considerations & Results Constructed prototype Antenna performance Parametric studies (III) Other Promising Studies Omnidirectional USB-dongle UWB antenna No-cost printed USB-dongle UWB antenna (IV) Conclusion 2
  3. 3. Conventional UWB Antennas 1 UWB planar monopole antenna Antenna perpendicular to a large ground plane Impedance matching controlled by shaping antenna geometry and/or adjusting antenna structure around feeding MOTL, vol 42, Sep 2004 IEEE AP, vol 53, Apr 2005 3
  4. 4. Conventional UWB Antennas 2 Numerous UWB planar monopole antennas in various shapes and sizes 4
  5. 5. Wireless USB with UWB Tech. Home usage scenarios that could be "unwired" with Wireless USB Wireless USB: the first high-speed personal wireless interconnect, 5 http://www.intel.com/technology/comms/wusb/download/wirelessUSB.pdf
  6. 6. Design Consideration 1- Configuration of the UWB antenna Antenna mainly comprises: a pair of wide-ended radiating arms and a bevel-feed transition; Metal plate onto a foam base of size 6 x 11 x 20 mm3 6 TW/US Patent Pending
  7. 7. Design Consideration 2- Proposed vs. reference antenna Corresponding antenna consists of a rectangular patch and a bevel-feed transition; Antenna volume remains the same for both Proposed Proposed antenna antenna Corresponding simple Corresponding simple planar monopole planar monopole 7
  8. 8. Design Consideration 3- Return-loss performance 10-dB RL BW reaches 7626 MHz (2984~10610 MHz) BW: proposed > ref. antenna (1.6 GHz larger) 8
  9. 9. Design Consideration 4- Measured radiation patterns Measured radiation patterns at 5 and 8 GHz Comparable E-theta and E-phi components for frequencies across the UWB band 9
  10. 10. Design Consideration 5- Peak gain and radiation efficiency Peak antenna gain varies in a range of 3.2-4.6 dBi across the UWB band; Mismatch radiation efficiency > 90% due to use of low-loss, low-permittivity foam base and antenna protruded from the system ground 10
  11. 11. Design Consideration 6- Parametric studies Width t of the wide-ended portions System ground-plane length L 11
  12. 12. Promising Studies 1- Omnidirectional USB-dongle UWB antenna MOTL, vol 49, Mar 2007 Retractable Retractable top casing! top casing! 12 TW/US Patent Pending
  13. 13. Promising Studies 2- Omnidirectional USB-dongle UWB antenna Measured radiation patterns at 5 and 9 GHz Omni-radiation in x-y (horizontal) planes 13 TW/US Patent Pending
  14. 14. Promising Studies 3- No-cost printed USB-dongle UWB antenna 10-dB RL BW covers the lower UWB band 3.1~4.85 GHz (BG1) 0 -10 -20 -30 -40 2.5E+009 3.5E+009 4.5E+009 5.5E+009 6.5E+009 7.5E+009 14 TW/US Patent Pending
  15. 15. Promising Studies 4- No-cost printed USB-dongle UWB antenna Comparable E-theta and E-phi radiation patterns; Peak antenna gain > 1 dBi; Radiation efficiency > 60% 360 0 270 90 180 15 TW/US Patent Pending
  16. 16. Conclusion Proposed antenna is very easy to implement by bending a metal plate into a compact structure Wide impedance BW of ~7.6 GHz and good radiation characteristics have been obtained More designs of the internal UWB antennas in wireless USB dongles are in progress 16
  17. 17. THANK YOU FOR YOUR ATTENTION! 17

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