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

Submission Title: [Wideband Antenna Design for UWB System]

Date Submitted: [July 2004]Revised: []

Source: [Sang-sung Choi, Jongkweon Park, Bonghyuk Park, Seungsik Lee, Jaeyoung Kim] Company [Electronics and Telecommunications Research Institute] Address [161 Gajeong-dong, Yuseong-gu, Daejeon, 305-350 Korea] Voice : [+82-42-860-6722], FAX : [+82-42-860-5199], E-mail [sschoi@etri.re.kr]

Re: [Technical contribution]

Abstract: [This presentation presents the design of wideband antenna for UWB system]

Purpose: [Technical contribution to characteristics of novel wideband antenna for ultra wideband system]

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 or organization. The material in this document is subject to change in form and content after further study. The contributor reserves 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.

July 2004 doc.: IEEE 802.15-04/323r0

July 2004

ETRISlide 2Submission

doc.: IEEE 802. 15-04/323r0

Wideband Antenna Design for UWB System

Sang-Sung Choi (sschoi@etri.re.kr)

Jong-Kweon Park(pjk64148@etri.re.kr)

Bong-Hyuk Park(bhpark@etri.re.kr)

Seung-Sik Lee(rfsslee@etri.re.kr)

Jae-Young Kim(jyk@etri.re.kr)

E T R I

www.etri.re.kr

July 2004

ETRISlide 3Submission

doc.: IEEE 802. 15-04/323r0

Overview

• Planar type linear polarization antenna has been developed for ultra wideband system

• This antenna covers wideband from 3.1 GHz to 8.3 GHz with small size and implemented in omni-directionally

• Antenna architecture is a patch and CPW feeding

July 2004

ETRISlide 4Submission

doc.: IEEE 802. 15-04/323r0

Antenna architecture

CPW feeding

Ground

Matching

Antenna architecture is based on CPW feeding and matched using multi-step impedance matching technique

Substrate information=4.5

H=0.76 mmCopper thickness = 0.035mm

Loss tangent = 0.002Size : 30mm x 30mm

r

July 2004

ETRISlide 5Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

S parameter characteristics are measured like following figure. The return loss is less than 10 dB from 3.1 GHz to 8.3 GHz

DUT

Network analyzer

July 2004

ETRISlide 6Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

The distance between two antennas is 15 cm. Insertion loss is constant from 3.1 GHz to 8.3 GHz

DUT

Network analyzer

July 2004

ETRISlide 7Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

Measured group delay in the boresight direction

July 2004

ETRISlide 8Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

-2.00

0.00

2.00

4.00

6.00

8.00

3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0

Frequency [GHz]

Ga

in [

dB

i]

The minimum gain is –0.43 dBi, the maximum gain is 3.1 dBi and gain variation has less than 3.53 dB

July 2004

ETRISlide 9Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

Gain patterns in the azimuth plane

3.5 GHz 6.0 GHz 8.5 GHz

: Co-polarization : Cross-polarization

July 2004

ETRISlide 10Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

Elevation gain patterns

3.5 GHz 6.0 GHz 8.5 GHz

: Co-polarization : Cross-polarization

July 2004

ETRISlide 11Submission

doc.: IEEE 802. 15-04/323r0

Antenna characteristic

The impulse generator transmit impulse signal using this antenna and is measured by oscilloscope. The signal level is reduced 1/10 because of path loss but the impulse response is similar with the source.

Signal source using cable Measured characteristic using antenna

July 2004

ETRISlide 12Submission

doc.: IEEE 802. 15-04/323r0

Real appearance

The real size is 30mm by 30mm and backside has no copper. It has the omni-directional characteristic.

July 2004

ETRISlide 13Submission

doc.: IEEE 802. 15-04/323r0

Summary• Small size and simple architecture wideband antenna

is developed for UWB system.

1) This antenna covers from 3.1GHz to 8.3GHz wideband

2) The group delay and insertion loss characteristics are very constant