The document presents a new ultra-wideband antenna design with improvements over a previous prototype. The new antenna is smaller in size and uses a Teflon substrate. It achieves return losses between -10 to -15 dB from 3.1 to more than 10.6 GHz, with gains above 4 dBi across the band. Radiation patterns are omnidirectional over the entire UWB range. The new antenna design satisfies requirements for UWB systems and is suitable for wireless devices due to its thin, small size and stable performance across the wide frequency band.

1. Slide1
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANS)
Submission Title: [CRL-UWB Consortium – Ultra-Wideband Antenna]
Date Submitted: [January 2004]
Source: [Kamya Yekeh Yazdandoost, Ryuji Kohno] Company [(1) Communications
Research Laboratory (CRL), (2) CRL-UWB Consortium]
Connector’s Address [3-4, Hikarino-oka, Yokusuka, 239-0847, Japan]
Voice: [+81-56-847-5435], FAX: [+81-46-847-5431]
E-mail: [yazdandoost@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 Ultra-Wideband Antenna for UWB
system.]
Purpose: [Antenna 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. Slide2
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
ULTRA-WIDEBAND ANTENNA
Kamya Yekeh Yazdandoost † ,
Ryuji Kohno †‡
† Communications Research Laboratory (CRL)
& CRL-UWB Consortium
‡ Yokohama National University

3. Slide3
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Presentation Overview
• Summary of Previously Proposed Antenna
• New UWB Antenna Design
• Results
• Conclusions

4. Slide4
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Previous Antenna Prototype

5. Slide5
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Summary of Previous Antenna
1. A thin and small antenna on FR-4 substrate
2. Frequency ranged covered by antenna is 3.8 - 10.6 GHz
3. VSWR = 2.8
4. Return loss ≈ -6.5 dB
5. Gain ≈ 2.2 - 4.7 dBi

6. Slide6
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
New UWB Antenna Design
Prototype Size: 44 × 20.5 × 0.46 mm
44 mm
20.5 mm 0.46 mm
i. Substrate: Teflon (εr = 2.17 , tanθ = 0.0006)
ii. Patch: Copper (18 um)
iii. Feed: Microstrip Line 50 Ω

7. Slide7
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Results
VSWR
Frequency (GHz)
New Design Bow-Tie Antenna

8. Slide8
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Results
Frequency (GHz)
Return Loss (dB)
New Design Bow-Tie Antenna

9. Slide9
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Results
Gain (dBi)
Frequency (GHz)
New Design Bow-Tie Antenna

10. Slide10
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern
Results
Etotal (dB) at f = 3.5 (GHz) for ------- φ = 0o φ = 90o

11. Slide11
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 4.5 (GHz) for ------- φ = 0o φ = 90o

12. Slide12
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 5.5 (GHz) for ------- φ = 0o φ = 90o

13. Slide13
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 6.5 (GHz) for ------- φ = 0o φ = 90o

14. Slide14
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 7.5 (GHz) for ------- φ = 0o φ = 90o

15. Slide15
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 8.5 (GHz) for ------- φ = 0o φ = 90o

16. Slide16
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 9.5 (GHz) for ------- φ = 0o φ = 90o

17. Slide17
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Radiation Pattern (Cont.)
Results
Etotal (dB) at f = 10.5 (GHz) for ------- φ = 0o φ = 90o

18. Slide18
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Results
3D Radiation Pattern
New Design Bow-Tie Antenna

19. Slide19
Submission
doc.:IEEE802.15-04-0026-00-003a
January 2004
CRL-UWB Consortium
Conclusions
 The 3D radiation pattern of antenna is showing that, it has
excellent performance for wireless devices, especially for
UWB system
 Satisfied the required bandwidth for UWB systems
 A thin and small antenna on Teflon substrate
 Greater than 4 dBi gain was shown to be achievable over
the frequency range
 Easy to design for on chip device