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