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.
2005 IEEE AP-S-Internal Shorted Patch Antenna for UMTS Mobile Phone
2007 IEEE AP-S-Internal UWB Metal-Plate Monopole Antenna for a Wireless USB Dongle
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
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. 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. 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
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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
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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
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11. Design Consideration 6-
Parametric studies
Width t of the wide-ended portions
System ground-plane length L
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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. 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
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
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