Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS)

1. 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)] Connector’s 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.] Communications Research Laboratory

2. 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 Communications Research Laboratory

3. 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. Communications Research Laboratory

4. 5 GHz W-LAN Power Spectrum 1 4 5 6 8 9 10 11 2 3 7 N division f [GHz] Background (2) Ultra Wideband Antenna for UWB System Single-band Dual- or Triple-band Multi-band UWB antenna can be applied to any band segmentations, such as single-, dual- and multi-bands. Need to suppress the interference where other systems exists Ultra Wideband system covers the frequency bands of 3.1~10.6GHz. Wideband antenna and dual frequency Communications Research Laboratory

5. 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. Communications Research Laboratory

6. 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 ＋ Divides UWB frequency band into 2 sub-bands • Antenna with dual frequency • Broadband characteristics Communications Research Laboratory

7. 0 -5 -10 -15 Return Loss [dB] -20 -25 -30 2 4 6 8 10 monopole Frequency [GHz] w=4 w=8 z w=12 w=16 w=20 y x Planar Monopole Antenna W H=20mm g 12 Bandwidths of each resonant frequency are changed by the antenna width. Communications Research Laboratory

8. 0 -5 VSWR=2 -10 -15 Return Loss [dB] -20 w=12 -25 -30 2 4 6 8 10 12 Frequency [GHz] Radiation pattern of planar monopole <xy plane> <zx plane> Omni-directional pattern in horizontal plane can be obtained. Communications Research Laboratory ( H=20mm, W=12mm ) 3.04~6.54GHz

9. FDTD parameter Monopole Antenna with Dual Frequency W Upper : Rectangle element (connected with lower) Lower : Rectangle element (Planar monopole antenna) Hu z Cell size: Dx,y=1mm Dz=0.5mm Hl Iteration steps : 5000 ABC : PML 8 layer g Input：Gaussian Pulse Feed Communications Research Laboratory

10. W 0 Hu z -5 -10 Return Loss [dB] Hl -15 -20 g planar -25 novel planar W -30 2 4 6 8 10 12 Frequency [GHz] H g Planar monopole and novel planar monopole (a) Novel Planar Monopole (b) Planar Monopole Resonant frequency is divided to two resonant frequencies by adding slit to planar monopole. Communications Research Laboratory

11. Current distribution per antenna structure 0 -5 -10 dB dB <planar monopole> <monopole> -15 Return Loss [dB] -20 monopole planar -25 novel planar -30 2 4 6 8 10 12 dB dB <lower frequency> <higher frequency> Frequency [GHz] novel planar monopole Communications Research Laboratory

12. 0 -5 -10 -15 Return Loss [dB] -20 -25 -30 2 4 6 8 10 12 Frequency [GHz] Return Loss characteristics of example antenna W Hu z Hl g Wide bandwidth with dual frequency can be achieved. Return Loss level is almost 0dB at around 5~6GHz. Communications Research Laboratory

13. z y x Radiation Pattern (xy) of example antenna • omni-directional pattern • Gain = 2.2-5.2dBi Communications Research Laboratory

14. z y x Radiation Pattern (yz) of example antenna omni-directional pattern in horizontal plane Communications Research Laboratory

15. z y x Radiation Pattern (zx) of example antenna omni-directional pattern in horizontal plane Communications Research Laboratory

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