Singapore 802.15.3a Meeting

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANS)
Submission Title CRL-UWB Consortium Ultra
Wideband Printed Bow-Tie Antenna Date Submitted
September 2003 Source Kamya Yekeh
Yazdandoost, Ryuji Kohno Company (1)
Communications Research Laboratory (CRL), (2)
CRL-UWB Consortium Connectors Address 3-4,
Hikarino-oka, Yokusuka, 239-0847, Japan Voice
81-56-847-5435, FAX [phone]
E-mail yazdandoost_at_crl.go.jp, kohno_at_crl.go.jp
Re IEEE P802.15 Alternative PHY Call for
Proposals, IEEE P802.15-02/327r7 Abstract This
presentation is Introduction to the Printed
Bow-Tie 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.
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ULTRA WIDEBAND PRINTED BOW-TIE ANTENNA
Kamya Yekeh Yazdandoost Communications Research
Laboratory (CRL) CRL-UWB Consortium Ryuji
Kohno Director, UWB Technology Institute,
CRL Professor, Yokohama National
University Chair, CRL-UWB Consortium
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Presentation Overview

• Introduction
• Patch Antenna
• Printed Bow-Tie Antenna
• UWB Antenna Design Challenge
• UWB Printed Bow-Tie Antenna
• Wideband Mechanism of Printed Bow-Tie Antenna
• Results
• Conclusions

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Introduction

• Antenna performance and size have a large impact
  on the development of wireless system.
• It is more complicated to provide the typical
  parameters like Bandwidth, Efficiency, and Gain
  within the limited antenna volume.
• This is more critical with respect to the UWB
  Antenna.

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Patch Antenna

• Patch antennas are extensively used in different
• wireless applications due to
• Low profile
• Light weight
• Easy to fabricate
• Low cost
• The major drawback is narrow bandwidth
• Because of it limited bandwidth, several designs
  of
• broadband patch antenna have been reported

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Printed Bow-Tie Antenna
Patch
Feed Point
Top-View
Patch
Substrate
Ground Plane
Side-view
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UWB Antenna Design Challenge

• Compact size while providing acceptable
• 1- VSWR
• 2- Bandwidth
• 3- Gain
• 4- Efficiency
• Omni-directional pattern
• To be suitable for on chip design, with good
  impedance matching
• Light weight
• Low cost

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UWB Printed Bow-Tie Antenna
Patch
Patch
Patch
Patch
Substrate
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Wideband Mechanism of Printed Bow-Tie Antenna
L
L
C
C
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Results
VSWR
Magnitude of VSWR
Frequency (GHz)
VSWRlt 3 (3.8 to 10.6GHz)
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Results
S11
Magnitude of Scattering Matrix (dB)
Frequency (GHz)
S11lt -6 dB (3.8 to 10.6GHz)
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Results
Gain
Magnitude of Gain (dBi)
Frequency (GHz)
Gain gt 2 dBi (3 to 10.6GHz)
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Radiation Pattern
Results
(a)
(b)
Radiation patterns in (a) f 0o and (b) f 90o
for the proposed antenna at 3.1 GHz.
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Radiation Pattern (Cont.)
Results
(a)
(b)
Radiation patterns in (a) f 0o and (b) f 90o
for the proposed antenna at 5.1 GHz.
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Radiation Pattern (Cont.)
Results
(a)
(b)
Radiation patterns in (a) f 0o and (b) f 90o
for the proposed antenna at 7.1 GHz.
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Radiation Pattern (Cont.)
Results
(a)
(b)
Radiation patterns in (a) f 0o and (b) f 90o
for the proposed antenna at 9.1 GHz.
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Conclusions

• A thin and small antennas on FR-4 substrate

• Good radiation patterns for wireless devices

• Satisfied the required bandwidth for UWB systems
  

• Greater than 2 dBi gain was shown to be
  achievable over
• the frequency range

• Easy to design for on chip device