March 2004 doc IEEE 802 15 040097 r

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Antenna Design for mm. W WPAN System] Date Submitted: [ 14 March 2004] Source: [Reed Fisher] Company [Oki Electric Industry Co. , Ltd. ] Address [2451 E. Maddox Rd. Buford, GA 30519 USA] Voice: [+1 -770 -271 -0529] E-Mail: [reedfisher@juno. com] [Seiji Nishi] Company [Oki Electric Industry Co. , Ltd. ] Address [3 -4 Hikari-no-oka, Yokosuka, Kanagawa 239 -0847, Japan] Voice: [+81 -46 -847 -5148] Fax : [+81 -46 -847 -5149] E-Mail: [nishi 646@oki. com] 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 802. 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 P 802. 15. Submission 1 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Design for millimeter-Wave WPAN System Submission 2 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Overview • 8 x 8 elements and 2 x 2 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 5 stage waveguide filters. The antenna gain of more than 25 d. Bi is measured for 8 x 8 element antenna, and the loss of 5 stage filter is less than 1. 0 d. B. Submission 3 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Type of Antenna for Millimeter-Wave Ad-Hoc Access System III 8 x 8 elements antenna 60 GHz band no 1 LO: 62. 9 GHz IF: 1. 5± 0. 31 GHz 60 GHz band no 2 LO: 65. 9 GHz IF: 1. 5± 0. 31 GHz 2 x 2 Elements Antenna 70 GHz band LO: 73. 0 GHz IF: 1. 5± 0. 31 GHz Submission 4 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Nishi’s Comments for Slide 4 (Type of Antenna for Millimeter-Wave Ad-Hoc Access System III) 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 8 x 8 elements antenna with linear polarization for AP to AP link, and 2 x 2 elements antenna with RHCP for AP to MT link. Submission 5 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Appearance Photograph of 8 x 8 circular waveguide array antenna with built-in filter. Size is 45. 6 mmx 11 mm Outline drawing of 2 x 2 circular wave guide array antenna with built-in filter. Size is 40 mmx 24 mmx 11 mm. Submission 6 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Aim of Design Circular waveguide array antenna Wide frequency bandwidth High antenna gain Circular waveguide array antenna with built-in filter High antenna gain Low insertion loss High rejection for rejection band Small size Rectangular waveguide 5 stage filter Low insertion loss High rejection for rejection band Filter design Pass band: LO and LSB Rejection band: USB and 2 LSB Filters are designed without adjustment. Submission 7 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Characteristics - 60 GHz band 8 x 8 element antenna Polarization : Linear More than 25 d. Bi antenna gain is obtained in the unlicensed frequency band (59 -67 GHz) Submission 8 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Characteristics - 60 GHz band 8 x 8 element antenna Polarization : Linear Submission 9 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Characteristics - 70 GHz band 2 x 2 element antenna Polarization : Right Handed Circular Polarization Submission 10 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Characteristics - 70 GHz band 2 x 2 element antenna Polarization : Right Handed Circular Polarization Submission 11 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Characteristics - 70 GHz band 2 x 2 element antenna Polarization : Right Handed Circular Polarization Submission 12 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Antenna Characteristics - 70 GHz band 2 x 2 element antenna Axial ratio measurement About 1 m apart Submission 13 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Nishi’s Comments for Slide 13 (Antenna Characteristics- 70 GHz band 2 x 2 element antenna -) Using the network analyzer, S 21 are measured with developed antenna as transmitter and the standard circular polarization antenna swichable to RHCP and LHCP as receiver antenna. Axial ratio, AR(d. B), can be calculated from the S 21 of RHCP, S 21(d. B)(RHCP), and LHCP, S 21(d. B)(LHCP), using the following equations, L/R=10(S 21(d. B)(RHCP)- S 21(d. B)(LHCP))/20 AR(d. B)=20 xlog((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 S 21 for RHCP and LHCP are shown as a function of frequency for 2 x 2 element antenna. The measured S 21 for RHCP is the relative antenna gain. From the figure, a very wide 3 d. B bandwidth of the antenna gain can be seen. The 3 d. B bandwidth of antenna gain is from 62 GHz to more than 75 GHz. In the figure, the calculated axial ratios of 2 x 2 element antennas are shown as a function of frequency. Submission 14 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Filter Characteristics -5 stage rectangular waveguide filter- The insertion loss in pass band (LO and LSB) is lower than – 2 d. B. The rejection for USB is higher than – 30 d. B. Submission 15 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Filter Characteristics -5 stage rectangular waveguide filter- The insertion loss in pass band (LO and LSB) is lower than – 2 d. B. The rejection for USB is higher than – 30 d. B. Submission 16 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Characteristics of antenna with built-in filter Submission 17 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi 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 Submission 18 Reed Fisher, Seiji Nishi Oki

March, 2004 doc. : IEEE 802. 15 -04/0097 r 0 -mmwi Conclusion • We developed the 2 x 2 element circular polarized (RHCP) antenna with built-in filter for 70 GHz band ad hoc wireless link, and 8 x 8 element linear polarized antenna with built-in filter for 60 GHz band wireless link and good characteristics are obtained. • The antenna gain of 8 x 8 element antenna is as large as 25. 5 d. Bi without filter. The loss of the filter for 70 GHz band wireless link in pass band is lower than 1. 0 d. B. The rejection for USB is larger than 30 d. B. • 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 2 x 2 element antenna with built-in filter is 40 mmx 24 mmx 11 mm, and that of the 8 x 8 element antenna is as small as 45. 6 mmx 11 mm Submission 19 Reed Fisher, Seiji Nishi Oki