1. Slide1Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS) Submission Title: [Wideband Antenna with Dual Frequency for UWB System] Date Submitted: [March 2004] Source: [Yuko Rikuta, Ryuji Kohno] Company [Communications Research Laboratory (CRL)] Connectors Address [3-4, Hikarino-oka, Yokusuka, 239-0847, Japan] Voice: [+81-46-847-5086], FAX: [+81-46-847-5431] E-mail: [rikuta@crl.go.jp, kohno@crl.go.jp] Re: [IEEE P802.15 Alternative PHY Call for Proposals, IEEE P802.15-02/327r7] Abstract: [This presentation is Introduction to the Wideband Antenna with Dual Frequency for UWB system. This novel monopole antenna consists of two connected planar elements.] Purpose: [Wideband Antenna with Dual Frequency for 802.15.TG3a] Notice: [This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.] Release: [The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.]

2. Slide2Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Wideband Antenna with Dual Frequency for UWB System Yuko Rikuta Ryuji Kohno Communications Research Laboratory, Japan Background Planar monopole antenna Geometry of analysis antenna model Antenna characteristics Conclusion

3. Slide3Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Background (1) UWB Antennas (3D) -Double Ridged Guided Horn Antenna -Log periodic Antenna -Monocone-like Antenna etc. UWB Antennas (2D) -Fractal Antenna -Vivaldi Antenna -Planar Dipole Antenna etc. DRGHA These antennas are covering 3.1~10.6GHz for UWB System.

4. Slide4Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Background (2) Ultra Wideband Antenna for UWB System Ultra Wideband system covers the frequency bands of 3.1~10.6GHz. Need to suppress the interference where other systems exists Wideband antenna and dual frequency Single-bandMulti-band N division Power Spectrum 3 1 2 456 7 891011 f [GHz] 5 GHz W-LAN Dual- or Triple-band UWB antenna can be applied to any band segmentations, such as single-, dual- and multi-bands.

5. Slide5Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Background (3) To operate two frequencies by using two antennas makes the size of antenna installation larger. Reducing the size is necessary. Antennas with dual frequency -radiation element + parasitic element -two-layered top loaded monopole antenna etc. These antennas are suitable for two narrowband applications. These antennas are suitable for two narrowband applications.

6. Slide6Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Background (4) Requirement for Ultra-wideband antenna Small size Easy for fabrication Return Loss characteristics : RL<-10dB VSWR characteristics : VSWR<3 Radiation pattern : omni directional pattern Gain characteristics : Gain>2dBi Antenna with dual frequency Broadband characteristics Divides UWB frequency band into 2 sub-bands

7. Slide7Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory 12 -30 -25 -20 -15 -10 -5 0 246810 Return Loss [dB] Frequency [GHz] monopole w=4 w=8 w=12 w=16 w=20 Planar Monopole Antenna W H=20mm g Bandwidths of each resonant frequency are changed by the antenna width. y z x

8. Slide8Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory ( H=20mm, W=12mm ) 3.04~6.54GHz Omni-directional pattern in horizontal plane can be obtained. -30 -25 -20 -15 -10 -5 0 24681012 Return Loss [dB] Frequency [GHz] w=12 VSWR=2 Radiation pattern of planar monopole

9. Slide9Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Monopole Antenna with Dual Frequency Cell size: x,y=1mm z=0.5mm FDTD parameter Iteration steps : 5000 ABC : PML 8 layer Input Gaussian Pulse Upper : Rectangle element (connected with lower) Lower : Rectangle element (Planar monopole antenna) Feed W HuHu HlHl z g

10. Slide10Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Planar monopole and novel planar monopole Resonant frequency is divided to two resonant frequencies by adding slit to planar monopole. Resonant frequency is divided to two resonant frequencies by adding slit to planar monopole. novel planar -30 -25 -20 -15 -10 -5 0 24681012 Return Loss [dB] Frequency [GHz] planar W HuHu HlHl z g W H g (a) Novel Planar Monopole(b) Planar Monopole

11. Slide11Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Current distribution per antenna structure novel planar monopole novel planar -30 -25 -20 -15 -10 -5 0 24681012 Return Loss [dB] Frequency [GHz] planar monopole dB dB

12. Slide12Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Return Loss characteristics of example antenna Wide bandwidth with dual frequency can be achieved. Return Loss level is almost 0dB at around 5~6GHz. W HuHu HlHl z g -30 -25 -20 -15 -10 -5 0 24681012 Return Loss [dB] Frequency [GHz]

13. Slide13Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Radiation Pattern (xy) of example antenna omni-directional pattern Gain = 2.2-5.2dBi y z x

14. Slide14Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Radiation Pattern (yz) of example antenna y z x omni-directional pattern in horizontal plane

15. Slide15Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Radiation Pattern (zx) of example antenna y z x omni-directional pattern in horizontal plane

16. Slide16Submission doc.:IEEE802.15-04-0114-00-003aMarch 2004 Communications Research Laboratory Proposed antenna has dual frequency with wide bandwidth. Planar monopole antenna with dual frequency upper : rectangle element lower : planar rectangular monopole antenna Conclusion The return loss level at the eliminated frequency between both resonances is almost 0 dB. Radiation pattern is omni-directional in horizontal plane.