doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Antenna Design for mmW WPAN System] Date Submitted: [ 14 March 2004] Source: [Reed Fisher] Company [Oki Electric Industry Co., Ltd.] Address [2451E. Maddox Rd. Buford, GA USA] Voice:[ ] [Seiji Nishi] Company [Oki Electric Industry Co., Ltd.] Address [3-4 Hikari-no-oka, Yokosuka, Kanagawa , Japan] Voice:[ ] Fax :[ ] Re : [] Abstract:[Description of Proposed technical requirements for mm-Wave WPAN ] Purpose:[Contribution for millimeter-wave interest group ] Notice :This document has been prepared to assist the IEEE P 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 P

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 2 Antenna Design for millimeter-Wave WPAN System

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 3 8x8 elements and 2x2 elements circular waveguide array antennas have been developed for millimeter-wave ad hoc wireless access system. To realize single side band self-heterodyne scheme with small size, these antennas have built-in 5stage waveguide filters. The antenna gain of more than 25dBi is measured for 8x8 element antenna, and the loss of 5stage filter is less than 1.0dB. Overview

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 4 2x2 Elements Antenna 70GHz band LO:73.0GHz IF: 1.5±0.31GHz 8x8 elements antenna 60GHz band no1 LO:62.9GHz IF:1.5±0.31GHz 60GHz band no2 LO:65.9GHz IF:1.5±0.31GHz Type of Antenna for Millimeter-Wave Ad-Hoc Access System III

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 5 In the ad-hoc access system, there are two wireless links, AP(access point) to AP link and AP to MT(mobile terminal) link. For the AP to AP link, as the wireless link is P-P, high gain antenna is required. In the AP to AP link, two channels are used. For the AP to MT link, the broad radiation angle antenna is required. The circular polarization is also required for free setting position of MT. We developed 8x8 elements antenna with linear polarization for AP to AP link, and 2x2 elements antenna with RHCP for AP to MT link. Nishi’s Comments for Slide 4 (Type of Antenna for Millimeter-Wave Ad-Hoc Access System III)

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 6 Outline drawing of 2x2 circular wave guide array antenna with built-in filter. Size is 40mmx24mmx11mm. Photograph of 8x8 circular waveguide array antenna with built-in filter. Size is 45.6mmx45.6mmx11mm Appearance

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 7 Aim of Design Circular waveguide array antenna Wide frequency bandwidth High antenna gain Rectangular waveguide 5 stage filter Low insertion loss High rejection for rejection band Circular waveguide array antenna with built-in filter High antenna gain Low insertion loss High rejection for rejection band Small size Filter design Pass band: LO and LSB Rejection band: USB and 2LSB Filters are designed without adjustment.

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 8 Antenna Characteristics - 60GHz band 8x8 element antenna - Polarization : Linear More than 25dBi antenna gain is obtained in the unlicensed frequency band (59-67GHz)

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 9 Antenna Characteristics - 60GHz band 8x8 element antenna - Polarization : Linear

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 10 Antenna Characteristics - 70GHz band 2x2 element antenna - Polarization : Right Handed Circular Polarization

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 11 Antenna Characteristics - 70GHz band 2x2 element antenna - Polarization : Right Handed Circular Polarization

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 12 Antenna Characteristics - 70GHz band 2x2 element antenna - Polarization : Right Handed Circular Polarization

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 13 Antenna Characteristics - 70GHz band 2x2 element antenna - Axial ratio measurement About 1m apart

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 14 Nishi’s Comments for Slide 13 (Antenna Characteristics- 70GHz band 2x2 element antenna -) Using the network analyzer, S21 are measured with developed antenna as transmitter and the standard circular polarization antenna swichable to RHCP and LHCP as receiver antenna. Axial ratio, AR(dB), can be calculated from the S21 of RHCP, S21(dB)(RHCP), and LHCP, S21(dB)(LHCP), using the following equations, L/R=10 (S21(dB)(RHCP)- S21(dB)(LHCP))/20 AR(dB)=20xlog((1+L/R)/(1-L/R)) where L is the electric field strength of LHCP, and R is the electric field strength of RHCP. In the figure, the measured S21 for RHCP and LHCP are shown as a function of frequency for 2x2 element antenna. The measured S21 for RHCP is the relative antenna gain. From the figure, a very wide 3dB bandwidth of the antenna gain can be seen. The 3dB bandwidth of antenna gain is from 62GHz to more than 75GHz. In the figure, the calculated axial ratios of 2x2 element antennas are shown as a function of frequency.

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 15 Filter Characteristics -5 stage rectangular waveguide filter- The insertion loss in pass band (LO and LSB) is lower than –2dB. The rejection for USB is higher than –30dB.

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 16 Filter Characteristics -5 stage rectangular waveguide filter- The insertion loss in pass band (LO and LSB) is lower than –2dB. The rejection for USB is higher than –30dB.

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 17 Characteristics of antenna with built-in filter

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 18 Nishi’s Comments for Slide 17 (-Characteristics of antenna with built-in filter -) The measured set up is shown in the right picture. The antenna is first measured without filter and second with filter

doc.: IEEE /0097r0-mmwi Submission March, 2004 Reed Fisher, Seiji Nishi OkiSlide 19 We developed the 2x2 element circular polarized (RHCP) antenna with built-in filter for 70GHz band ad hoc wireless link, and 8x8 element linear polarized antenna with built-in filter for 60GHz band wireless link and good characteristics are obtained. The antenna gain of 8x8 element antenna is as large as 25.5dBi without filter. The loss of the filter for 70GHz band wireless link in pass band is lower than 1.0dB. The rejection for USB is larger than 30dB. These results confirmed that the circular waveguide array antenna is suitable for broadband millimeter-wave wireless system. Also we realized very small size antenna with built-in filter. The size of the 2x2 element antenna with built-in filter is 40mmx24mmx11mm, and that of the 8x8 element antenna is as small as 45.6mmx45.6mmx11mm Conclusion