2009 IEEE AP-S-Compact Coaxial-Line-Fed Printed Monopole Antenna for Lower-Band UWB Applications

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A compact, printed, ultrawideband (UWB) monopole antenna suitable to be as an internal antenna attractive for future UWB applications is demonstrated. The proposed antenna is of a small form factor with the dimensions 6 mm × 33 mm and can easily be fed by 50-ohms mini-cable line. The antenna mainly comprises a monopole antenna, a feeding strip and a ground plane, all printed on a small FR4 substrate. The monopole antenna is printed on both layers of the substrate with an end portion on the back for control of the first/lower resonant mode of the antenna. The feeding strip in between the monopole antenna and the ground plane is further offset to achieve better impedance matching and proper upper-edge operating frequency. With the proposed antenna structure, which provides an operating bandwidth of larger than 2.7 GHz, the impedance bandwidth by 10-dB return loss can easily cover the 3.1–4.85 GHz band, the lower band of the UWB operation.

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2009 IEEE AP-S-Compact Coaxial-Line-Fed Printed Monopole Antenna for Lower-Band UWB Applications

  1. 1. 2009 IEEE AP-S International Symposium Compact Coaxial-Line-Fed Printed Monopole Antenna for Lower- Band Ultrawideband Applications 1 Saou-Wen Su, Ph.D. and 2Fa-Shian Chang 1 Network Access Strategic Business Unit, Lite-On Technology Corp., Taipei, Taiwan 2 Dept. of Electronics, Cheng Shiu University, Kaohsiung, Taiwan *E-mail: stephen.su@liteon.com Jun 05, 2009
  2. 2. Outlines (I) Introduction UWB fact sheet and Band Group Conventional UWB monopoles UWB WUSB dongle antenna (II) Design Consideration & Results Constructed prototype and test results Parameterized studies (III) UWB Bloom & Doom (IV) Conclusion 2
  3. 3. UWB Fact Sheet UWB (Ultra-Wideband), RF technologies formerly classified for military applications Approval (Revision of Part 15) of FCC, Feb 2002, for commercial communications High-speed > 100 Mb/sec, short-range < 10 m radius, low-power < -41 dBm/MHz Systems in the 3.1-10.6 GHz band with BW > 25% or > *1.5 GHz (*the center frequency > 6 GHz) Suited for IEEE 802.15 WPAN (Wireless Personal Area Network) 3
  4. 4. UWB Band Group 1 to 5 Band numbering: relationship between center frequency fc and band ID number nb is given: spacing of 528 MHz within 3100-10600 MHz Band Group allocation FIVE Band Group comprises: FOUR has three bands ONE has two bands UECMA-368 - High Rate Ultra Wideband PHY and MAC Standard, 4 http://www.wimedia.org/en/resources/eis.asp?id=contact
  5. 5. UWB Band Group 1 to 5 FIVE Band Group comprises: Band numbering: relationship between center FOUR has three bands frequency fc and band ID number nb is given: ONE has two bands spacing of 528 MHz within 3100-10600 MHz Band Group allocation FIVE Band Group comprises: FOUR has three bands ONE has two bands UECMA-368 - High Rate Ultra Wideband PHY and MAC Standard, 5 http://www.wimedia.org/en/resources/eis.asp?id=contact
  6. 6. UWB Band Group 1 to 5 FIVE Band Group comprises: FOUR has three bands ONE has two bands Band Group allocation 6
  7. 7. Conventional UWB Antennas 1 UWB planar monopole antennas Antenna perpendicular to 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 7
  8. 8. Conventional UWB Antennas 2 Numerous UWB planar monopole antennas in various shapes and sizes 8
  9. 9. UWB Antenna for WUSB Dongle Antenna comprises: a pair of radiating arms a bevel-feed transition UWB WUSB-dongle antennas are very promising applications 9 US/TW patent pending IEEE AP, vol 55, Apr 2007
  10. 10. Design Consideration 1- Antenna Configuration Compact printed UWB antenna: printed on both layers of a 0.4-mm substrate compact structure: 6 (W) x 33 (L) mm (0.06- x 0.34-lambda at 3.1 GHz) comprises three portions: a monopole antenna, a feeding strip and a ground plane 10
  11. 11. Design Consideration 2- Design Principles offsetting feeding strip is to achieve a larger upper-edge operating frequency; at the same time, to satisfy required impedance matching around middle frequency band small portion is cut out from ground plane to accommodate feeding strip end portion on bottom layer is to provide additional lower resonant mode for controlling lower-edge frequency 11
  12. 12. Experimental Results 1- Impedance Bandwidth (Proposed Antenna) 10-dB RL BW (2.77 GHz) covers lower-band UWB of 3.1-4.85 GHz near optimal value of feed gap d is 2 mm 12
  13. 13. Experimental Results 2- Impedance Bandwidth (Reference Antennas) no end portion (L = 0) no end portion (L = 0) no offset feeding (h = 0) Ref. 1: single resonance at 3.4 GHz is excited below 4.2 GHz; Ref. 2: simple, rectangular monopole antenna with a narrow bandwidth (700 MHz, 3305-4005 MHz) only 13
  14. 14. Experimental Results 3- 2-D Far-filed radiation patterns 3100 MHz 4000 MHz 4850 MHz 14
  15. 15. Experimental Results 4- 3-D far-filed radiation patterns Measurement was conducted with great-circle method at 3 x 3 x 7 m anechoic chamber Omnidirectional-radiation patterns obtained are similar to conventional, wire-dipole radiation characteristics 15
  16. 16. Experimental Results 5- 3-D far-filed radiation patterns Gain varies in a range of 2.8-3.7 dBi; Radiation efficiency exceeds 82% overall (%) Note that input power is 0 dBm (default value) for 16 antenna OTA measurement (passive)
  17. 17. Parameterized Studies 1- Small feed gap d feed gap d Feed gap d varies from 1 to 3 mm; Upper-edge frequency is largely affected 17
  18. 18. Parameterized Studies 2- End portion length L End portion L Two resonant modes: one fundamental and one additional without and with end portion are excited < 4.4 GHz; Additional resonant mode is excited to achieve a 18 smaller lower-edge frequency < 3.1 GHz
  19. 19. Parameterized Studies 3- Distance h of offset feeding strip distance h of feeding strip Upper-edge frequency increases as h decreases; Lower-edge frequency, fundamental and additional resonant modes are unchanged; 19 Hump > 10 dB occurs when h < 6 mm
  20. 20. Bloom and Doom “The time is ripe for a special issue on UWB antennas that captures this progress and provides insight to where FCC authorized UWB in 2002 UWB antenna design will go in the future.” 20 “Ultra-wideband antenna,” Intl Journal of Antennas and Propag, vol 2008
  21. 21. Bloom and Doom UWB Start-ups shuts down WiQuest Closed (Oct. 2008) TZero Closed (Feb. 2009) Radiospire Closed (Arp. 2009) PulseLink Lay-off 2008 Staccato Communications and Artimi merged (Nov. 2008): Staccato Communications and Artimi announced a merger between the two companies. WiMedia, the UWB industry group folded (Mar. 2009): WiMedia to transfer specification development to Bluetooth and Wireless USB 21
  22. 22. Conclusion Proposed coaxial-line-fed UWB antenna is compact (6 mm x 33 mm) and easy to fabricate on PCB Can be concealed in a narrow space between the panel and housing of a LCD display or HDTV, for future lower-band (3.1-4.85 GHz) UWB applications Time domain property of the antenna will be studied in the future 22
  23. 23. NA SBU ODM/OEM Product Line advanced consumer-electronics devices WLAN/Bluetooth/WiMAX modules USB form factor full/half-size PCIe MP3/PMP WiMAX communications digital photo frame network hub BT dongle/PCMCIA internet radio USB hub antennas AP/router digital TV tuners Bluetooth headset/car hands free kit TV dongle half-size mini-card 23 DVB-T/WLAN combo
  24. 24. Lite-On Global Headquarters THANK YOU FOR YOUR ATTENTION! 24

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