ᘓ⠏ᮏ㒊 ᢏ⾡㒊 㡢㡪࣭㟁☢⎔ቃ G Wireless LAN (1) Wireless LAN (2) Wireless LAN (3) EAST WEST -35 -37 -39 -41 -43 -45 -47 -49 -51 -53 -55 -57 -59 -61 -63
Field Strength [dBm] @ 2.4GHz band U.D.C 537.87
ᗄఱගᏛ㏆ఝࢆ⏝࠸ࡓᑕ㸭㏱㐣ࡢᐇ ࢹ࣮ࢱᇶ࡙ࡃ
ᐊෆ㟁Ἴ⎔ቃண ᡭἲ
Ώ㎶ ᣅே
㸨ᕝ℩ 㝯
㸨 せ ⣙㸸 ᘓ≀ࡢ୰࡛ࡢ㟁Ἴఏᦙࡣ㸪ቨ㸪ᗋ㸪ኳཬࡧொჾࡽࡢᑕࡼࡗ࡚」㞧࡞ఏᦙ⤒㊰ࢆᙧᡂࡍࡿࡓࡵ㸪ᒇእࡢࡼ࠺࡞ぢ㏻ࡋෆ ఏᦙࡣࡁࡃ␗࡞ࡾ㸪ࡇࢀࢆ⌮ㄽⓗィ⟬ࡍࡿࡓࡵࡢࣔࢹࣝࡣ୍⯡ᅔ㞴࡛࠶ࡿࠋᮏሗ࿌࡛ࡣ㸪ቨ㸪ᗋ㸪ኳࡢᑕ㸭㏱㐣 ≉ᛶࡢᐇ ࢹ࣮ࢱᇶ࡙ࡃࣔࢹࣝᡭἲࢆᥦࡋ㸪ᚑ᮶㸪ᦠᖏ㟁ヰᇶᆅᒁ➼ࡢᒇእ㟁Ἴఏᦙゎᯒ⏝࠸ࡽࢀࡿᗄఱගᏛ㏆ఝ 㸦Ray-trace ἲ㸧ࡢే⏝ࡼࡿᐊෆ㟁Ἴ⎔ቃண ᡭἲࡘ࠸᳨࡚ドࢆ⾜ࡗࡓࠋ୍ࡋ࡚㸪ᢏ⾡◊✲ᡤෆࡢ㆟ᐊࢆࣔࢹࣝࡋ ࡚㸪ᐊෆࡢ↓⥺ LAN ⎔ቃࢆண ࡋࡓ⤖ᯝ㸪ᐇ ್ࢆᇶ‽ࡋࡓࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࡢᖹᆒ೫ᕪ 6.06dB ௨ෆࡢ⢭ᗘࡀᚓࡽࢀࡓࠋ 㺕㺎㺺㺎㺢㺼㸸 ᗄఱගᏛ㏆ఝ㸪ࣞࢺ࣮ࣞࢫἲ㸪ᑕಀᩘ㸪ㄏ㟁⋡㸪ᐊෆ↓⥺ LAN ┠ ḟ㸸 ࡣࡌࡵ ࣔࢹࣝࡢᡭ㡰 ᚑ᮶ᡭἲ ᐇ ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢᩚྜᛶ᳨ド ᥦᡭἲࡢᴫせ ࡲࡵ ࡣࡌࡵ ࢫ࣐࣮ࢺࣇ࢛ࣥࡸ↓⥺ LAN ᦚ㍕ࢹࣂࢫࡢᛴ㏿࡞ᬑ ཬࡼࡾ㸪ᦠᖏ㟁ヰᅇ⥺௨እࡶ Wi-Fi ࡼࡿࢹ࣮ࢱ㏻ ಙࢆ⏝ࡍࡿᶵࡀቑ࠼࡚ࡁ࡚࠸ࡿࠋၟᴗタ㸪ᒎ♧ ሙࡢࡼ࠺࡞ᗈ࠸✵㛫࡛ Wi-Fi ࢧ࣮ࣅࢫ࢚ࣜࢆᥦ౪ ࡍࡿሙྜ㸪⏝⪅ࡀᡤᣢࡍࡿ Wi-Fi ➃ᮎࡲ࡛༑ศ㟁Ἴ ࡀᒆࡃࡼ࠺㸪㏻ಙࢭࣝタィࡸ㸪ྛࢭࣝ㛫࠾ࡼࡧእ᮶ ࡢ㟁Ἴࡢᖸ΅ࢆ㜵Ṇࡍࡿࡓࡵࡢࢳࣕࣥࢿࣝタィࡀᚲ せ࡞ࡿࠋࡇࡇ࡛㸪ᘓ≀ᙧ≧ࡸ↓⥺ LAN ࢡࢭࢫ࣏ ࣥࢺࡢ㓄⨨᮲௳➼ࡢሗࢆᇶ㸪ᘓ≀ෆ࠾ࡅࡿ㟁Ἴ ⎔ቃ㸦㟁Ἴᙉᗘศᕸ㸧ࢆ㐺ษண ࡛ࡁࢀࡤ㸪ࡇࡢ✀ ࡢ᳨ウࢆᐜ᫆⾜࠼ࡿࡼ࠺࡞ࡿࠋ ୍ࡋ࡚㸪ᅗ 1 ᯾ົᡤࣅࣝ࠾ࡅࡿ↓⥺ LAN 㟁Ἴ⎔ቃࡢᐇ ࢆ♧ࡍ㸦ᅗ୰ࡢ༢ dBm ࡣ㟁ຊ್ࢆ ⾲ࡍ㸧ࠋྠᅗ(a)ࡣ㸪↓⥺ LAN ࡢࢡࢭࢫ࣏ࣥࢺᩘࡀ 3 ࡛࠶ࡾ㸪(b)ࡣࢡࢭࢫ࣏ࣥࢺᩘࡀ 4 ࡛࠶ࡿࠋࡇࡢࡓ ࡵ㸪(a)࡛ࡣ㟁Ἴࡢᙅ࠸࢚ࣜࡀ୍㒊Ꮡᅾࡍࡿࡀ㸪(b)࡛ ࡣ㟁Ἴ⎔ቃࡀᨵၿࡉࢀయ㟁Ἴࡀᗈࡀࡗ࡚࠸ࡿࡇ ࡀศࡿࠋࡇࡢࡼ࠺࡞ᐇ ⤖ᯝࢆᇶࢡࢭࢫ࣏ࣥ ࢺࡢ㓄⨨タィࢆ⾜࠺ࡣྍ⬟ࡔࡀ㸪ᐇ ከࡃࡢ ᐃ ࣏ࣥࢺᩘࢆᚲせࡍࡿࡇࡸ㸪᪤Ꮡࡢົᡤ࡛ࡣᇳ ົ㛫ᖏእ⾜࠺ᚲせࡀ࠶ࡿ➼ࡢၥ㢟ࢆ᭷ࡍࡿࠋ ᚑ᮶㸪ᒇእ㟁Ἴఏᦙࢆࢩ࣑࣮ࣗࣞࢩࣙࣥࡍࡿ᪉ἲ ࡋ࡚ᗄఱගᏛ㏆ఝᡭἲ࡛࠶ࡿࣞࢺ࣮ࣞࢫ(Ray-trace)ἲ ࡤࢀࡿ᪉ἲࡀ୍⯡ⓗ⏝࠸ࡽࢀ࡚࠸ࡿࠋࡇࡢᡭἲ ࡣᅗ 2 ♧ࡍࡼ࠺㸪ᒇእ࠾ࡅࡿᦠᖏ㟁ヰᇶᆅᒁ➼ࡢ 㟁Ἴఏᦙゎᯒ⏝࠸ࡽࢀ࡚࠾ࡾ1)㸪ᇶᆅᒁࡀ࢝ࣂ࣮ࡍࡿ ࢚ࣜࡢ᥎ᐃά⏝ࡉࢀ࡚࠸ࡿࠋࣞࢺ࣮ࣞࢫἲࡣ㸪 㟁Ἴࢆ↓ᩘࡢࣞ㸦ග⥺㸧ぢ࡞ࡋ㟁Ἴࡢ㌶㊧ࢆࢺࣞ ࣮ࢫࡍࡿࡇ࡛㸪㟁Ἴࡢ㏦ಙ㟁ຊᑐࡍࡿ┦ᑐⓗ࡞ཷ ಙ㟁ຊࢆồࡵࡿᡭἲ࡛࠶ࡿࠋࣞࢺ࣮ࣞࢫἲࢆᐊෆ 㐺⏝ࡋ㸪ᅗ 1 ࡢࡼ࠺࡞㟁Ἴ⎔ቃࡢண ࢆ⾜࠺ሙྜ㸪ᐊෆ ࡢொჾ➼ࢆྵࡵࡓヲ⣽࡞ࣔࢹࣝࡸ㸪ྛ㒊ᮦࡽࡢ ᑕ⋡ࢆṇ☜⾲⌧ࡍࡿࡇࡀᚑ᮶ࡣᅔ㞴ࡉࢀ࡚࠸ࡓࠋ (a) Type-A (b) Type-B ᅗ 1 ↓⥺ LAN 㟁Ἴ⎔ቃࡢᐇ ⤖ᯝ Wireless LAN (1) Wireless LAN (2) Wireless LAN (3) Wireless LAN (4)Field Strength [dBm] @ 5GHz band EAST WEST -35 -37 -39 -41 -43 -45 -47 -49 -51 -53 -55 -57 -59 -61 -63 * 建築本部 技術部 音響・電磁環境 G U.D.C 537.87
幾何光学近似を用いた反射／透過の実測データに基づく
室内電波環境予測手法
渡辺 拓人
＊川瀬 隆治
＊ᅗ 2 ᚑ᮶ࡢࣞࢺ࣮ࣞࢫἲࡢ⏝㏵࣓࣮ࢪ ࡲࡓ㸪ᚑ᮶ࡢᐊෆゎᯒࡣ FDTD ἲ㸦Finite Difference Time-Domain㸧ࢆ⏝࠸ࡓつᶍゎᯒࢆࢫ࣮ࣃ࣮ࢥࣥࣆࣗ ࣮ࢱ࣮ࡼࡾ⾜ࢃࢀࡓࡀ࠶ࡿࡀ 2)㸪 ┦ᙜࡢࣁ࣮ࢻ ࢙࢘ࡀᚲせ࡞ࡿほⅬࡽࠊࡼࡾ⡆᫆ᐇົୖ⏝ ࡛ࡁࡿ᪉ἲࡋ࡚ࣞࢺ࣮ࣞࢫἲࡢ⏝ࡀᮃࡲࢀ࡚࠸ ࡿࠋ ࡑࡇ࡛ᮏሗ࡛ࡣ㸪ቨ㸪ᗋ㸪ኳ࠾ࡼࡧொჾࡢᑕ㸭 ㏱㐣≉ᛶࡢᐇ ࢹ࣮ࢱᇶ࡙ࡃࣔࢹࣝᡭἲࢆᥦࡋ㸪 ᚑ᮶㸪ᦠᖏ㟁ヰᇶᆅᒁ➼ࡢᒇእ㟁Ἴఏᦙゎᯒ⏝࠸ࡽ ࢀࡿࣞࢺ࣮ࣞࢫἲࡢే⏝ࡼࡿᐊෆ㟁Ἴ⎔ቃண ᡭἲࡘ࠸᳨࡚ドࢆ⾜ࡗࡓࠋ୍ࡋ࡚㸪ᢏ⾡◊✲ᡤ ෆࡢ㆟ᐊࢆࣔࢹࣝࡋ࡚㸪ᮏᡭἲࡢጇᙜᛶࡘ࠸࡚ ࢩ࣑࣮ࣗࣞࢩࣙࣥཬࡧᐇ ࡢẚ㍑ࡼࡾ᳨ドࢆ⾜ࡗࡓࠋ ᚑ᮶ᡭἲ ࣞࢺ࣮ࣞࢫἲࢆ⏝࠸ࡓᒇእ࠾ࡅࡿᇶᆅᒁ➼ࡢ㟁 Ἴఏᦙゎᯒ࡛ࡣ㸪ࣥࢸࢼࡽᨺᑕࡉࢀࡿ↓ᩘࡢࣞ ࡢ୰ࡽཷಙⅬ฿㐩ࡍࡿࣞࢆᢳฟࡋ㸪㟁Ἴࡢ㌶㊧ ࢆࢺ࣮ࣞࢫࡍࡿࡇ࡛ཷಙ㟁ຊࡀィ⟬ࡉࢀࡿࠋࣞࢺ ࣮ࣞࢫἲࡢධຊࢹ࣮ࢱࡋ࡚௨ୗࡢ㡯┠ࡀ࠶ࡿࠋ ࣭ᵓ㐀≀㸦ᘓ≀㸧ࡢ୕ḟඖᙧ≧ࢹ࣮ࢱ ࣭ᵓᡂᮦᩱࡢㄏ㟁⋡ ࣭ࣥࢸࢼධຊ㟁ຊ㸦W㸸࣡ࢵࢺ㸧 ࣭ධຊಙྕ࿘Ἴᩘ㸦Hz㸸࣊ࣝࢶ㸧 ࣭ࣥࢸࢼࡢᣦྥᛶࢹ࣮ࢱ㸦T, I㸸⌫ᗙᶆ⣔㸧 ࡇࡇ࡛୕ḟඖᙧ≧ࢹ࣮ࢱࡣ㸪❆㒊࡞ࡢヲ⣽ࡣ┬࠸ ࡓ⡆᫆࡞ᘓ≀ࣔࢹࣝࡀ⏝࠸ࡽࢀ࡚࠾ࡾ㸪ᘓ≀ࢆᵓᡂࡍ ࡿᮦᩱࡘ࠸࡚ࡶᘓ≀ෆ㒊ࡢ✵㛫ࡲ࡛ࡣ⪃៖ࡏࡎ㸪ᆒ ୍࡞ࢥࣥࢡ࣮ࣜࢺᮦᩱ࡛ᇙࡵ㎸ࡲࢀࡓࣔࢹࣝᡭἲࡀ ࡽࢀ࡚ࡁࡓ1), 3)ࠋࡇࡢࡼ࠺࡞ᒇእ㟁Ἴఏᦙゎᯒࡢሙྜ㸪 ᇶᆅᒁࡽᨺᑕࡉࢀࡿ㟁Ἴࡀᘓ≀㐽ࡽࢀ࡚ᙳ࡞ࡿ ሙᡤࢆ᥈⣴ࡍࡿࡀ┠ⓗ࡛࠶ࡾ㸪ཝᐦᘓ≀ࡢᑕࡸ ㏱㐣ࢆ⪃៖ࡍࡿᚲせࡣ࡞ࡗࡓࠋ ࡋࡋ࡞ࡀࡽ㸪ᘓ≀ෆ㒊ࢆゎᯒᑐ㇟ࡍࡿሙྜ㸪ࣞ ࢺ࣮ࣞࢫἲ࡛ࡣձᙧ≧ࡀ」㞧࡞ࡿィ⟬ከ࡞ 㛫ࢆせࡍࡿ㸪 ղᵓᡂ㒊ᮦࡢ≀ᛶ㸦ㄏ㟁⋡㸧ࡀ୍⯡ⓗ ࡣᮍ▱࡛࠶ࡿ㸪࠸࠺ၥ㢟ࢆ᭷ࡍࡿࠋヲ⣽࡞ࣔࢹࣝ ࠾࠸࡚㸪ࣔࢹࣝࢆᵓᡂࡍࡿせ⣲ࡢ㠃ᩘࡸ㎶ᩘࡣゎ ᯒୖࡢᑕ㸭㏱㐣ィ⟬ࡸᅇᢡィ⟬ࡢ㈇Ⲵ࡞ࡿࠋࡲࡓ㸪 㟁Ἴࡢᑕࡸ㏱㐣ࡣㄏ㟁⋡ࡤࢀࡿ≀ᛶ್౫Ꮡࡍ ࡿࡇࡽ㸪㒊ᮦࡈṇ☜࡞ㄏ㟁⋡ࢆᐃ⩏ࡍࡿᚲせ ࡀ࠶ࡿࠋ࠼ࡤ㸪ㄏ㟁⋡ࡢࡁ࠸㔠ᒓࡢࡼ࠺࡞≀య࡛ ࡣᑕࡀࡁࡃ㸪ㄏ㟁⋡ࡢᑠࡉ࠸ࣉࣛࢫࢳࢵࢡࡸ࢞ࣛ ࢫ➼࡛ࡣ⌮ㄽୖᑕࡀᑠࡉࡃ࡞ࡿࠋࡇࡢㄏ㟁⋡ࡢṇ☜ ࡞್ࢆධᡭࡍࡿࡓࡵࡣ㧗⢭ᗘࡢࢿࢵࢺ࣮࣡ࢡࢼࣛ ࢨཬࡧ㧗ᗘ࡞ᮦᩱᐃᩘ᥎ᐃᡭἲࡀᚲせ࡞ࡿࠋ ࡇࡢࡼ࠺ᐊෆࡢ」㞧࡞ᙧ≧ࢆヲ⣽ࣔࢹࣝࡋ㸪 ᵓᡂࡍࡿ㒊ᮦࡈࡢㄏ㟁⋡ࢆṇ☜ᐃ⩏ࡍࡿᚲせࡀ࠶ ࡿ୍᪉࡛㸪ࣔࢹࣝࢆᵓᡂࡍࡿྛせ⣲ࡢ㠃ᩘࡸ㎶ᩘ➼ࡢ 」㞧ࡉࡀᑕ㸭㏱㐣ィ⟬ࡸᅇᢡィ⟬ࡢ㈇Ⲵ࡞ࡿࡓࡵ㸪 ゎᯒࢆ⾜࠺ୖ࡛ࡢࢺ࣮ࣞࢻ࢜ࣇࡀ⏕ࡌࡿࠋ ᥦᡭἲࡢᴫせ ୖグࡢࡼ࠺ᮦᩱࡢㄏ㟁⋡ࢆ㒊ᮦࡈṇ☜ධຊ ࡍࡿࡣ㸪࠼ࡤ RC ቨࡢࡼ࠺ࢥࣥࢡ࣮ࣜࢺᮦᩱᇙ ࡵ㎸ࡲࢀࡓ㕲➽ࢥࣥࢡ࣮ࣜࢺࢆศࡅ࡚⪃࠼ࡿᚲせࡀ ࠶ࡾ㸪ࡇࢀࡽࢆヲ⣽ࣔࢹࣝࡍࡿࡇࡣ㸪ࣞࢺࣞ ࣮ࢫἲ࠾࠸࡚ᙧ≧ࡢ㠃ᩘࡸ㎶ᩘࡢ」㞧ࡉ㉳ᅉࡋࡓ ࡁ࡞ィ⟬㈇ᢸ࡞ࡿࠋ ࡇࡢࡼ࠺࡞ၥ㢟ࢆゎᾘࡍࡿࡓࡵ㸪ᮏᡭἲ࡛ࡣ㸪ᅗ 3 ♧ࡍࡼ࠺ࣔࢹࣝࢆᵓᡂࡍࡿ㒊ᮦయࡋ࡚ࡢ㟁Ἴ ࡢ≉ᛶࢆணࡵᐇ ࢹ࣮ࢱࡋ࡚ྲྀᚓࡍࡿࡇ࡛㸪ᐇ ್࡛⨨ࡁ࠼ࡓ୍ࡘࡢ㠃ࡋ࡚ᢅ࠺ࠋࡇࢀࡼࡗ࡚㸪 ྛ㒊ᮦࡢᙧ≧ࢆヲ⣽ࣔࢹࣝࡍࡿᚲせࡀ࡞ࡃ࡞ࡾ㸪 ㄏ㟁⋡࣭ᑟ㟁⋡ࡢධຊ್ࡢㄗᕪ㉳ᅉࡍࡿᑕࣞ࣋ࣝ ࡢィ⟬ㄗᕪࡶゎᾘࡍࡿࡇࡀ࡛ࡁࡿࠋ ᅗ 3 ᥦࣔࢹࣝᡭἲ ࣔࢹࣝࡢᡭ㡰 ୍ࡋ࡚ᢏ⾡◊✲ᡤෆࡢ㆟ᐊࢆᑐ㇟ࡋ࡚㸪ᐊ ෆࡢቨ㸪ᗋ㸪ኳࡢᑕ㸭㏱㐣≉ᛶࡢᐇ ࢹ࣮ࢱᇶ ࡙࠸࡚ࣔࢹࣝࢆ⾜ࡗࡓࠋ࡞࠾㸪ࣞࢺ࣮ࣞࢫἲゎᯒ ࡣᑓ⏝ࢯࣇࢺ࢙࢘ RaplabVer.4.1㸦ᵓ㐀ィ⏬◊✲ᡤ㸧 ࢆ⏝࠸ࡓࠋゎᯒࢆᐇ⾜ࡍࡿࡲ࡛ࡢᡭ㡰ࢆ௨ୗ♧ࡍࠋ ձ ᐊෆࡢቨ࣭ᗋ࣭ኳཬࡧொჾࡢ㟁Ἴᑕ⋡ࡢᐇ 㻹㼛㼎㼕㼘㼑㻌㼜㼔㼛㼚㼑 㻻㼡㼠㼐㼛㼛㼞㻌㼍㼚㼠㼑㼚㼚㼍㻛 㻮㼍㼟㼑㻌㼟㼠㼍㼠㼕㼛㼚 㻹㼛㼎㼕㼘㼑㻌㼜㼔㼛㼚㼑 㻹㼍㼠㼑㼞㼕㼍㼘㻌㻰 㻹㼍㼠㼑㼞㼕㼍㼘㻌㻯 㻹㼍㼠㼑㼞㼕㼍㼘㻌㻮 㻹㼍㼠㼑㼞㼕㼍㼘㻌㻭 䞉㻵㼚㼏㼕㼐㼑㼚㼠㻌㼣㼍㼢㼑 䞉㻾㼑㼒㼘㼑㼏㼠㼑㼐㻌㼣㼍㼢㼑 㻮㼍㼟㼕㼏㻌㼙㼑㼠㼔㼛㼐 㻼㼞㼛㼜㼛㼟㼑㼐㻌㼙㼑㼠㼔㼛㼐
ղ ᐇ ್ࢆᇶఏ㏦⥺㊰⌮ㄽࢆ⏝࠸࡚➼౯ⓗ࡞ㄏ㟁 ⋡ࢆ㏫⟬ ճ ᐊᙧ≧ࢆ㠃࡛ࣔࢹࣝࡋྛ㠃ᑐࡋ࡚➼౯ⓗ࡞ㄏ 㟁⋡ࡢࡾᙜ࡚ մ ㄏ㟁⋡ࡀᐃ⩏ࡉࢀࡓᐊᙧ≧ࣔࢹࣝࢆ⏝࠸࡚ Raplab ࡼࡾࢩ࣑࣮ࣗࣞࢩࣙࣥࢆᐇ⾜ ௨ୗྛᡭ㡰ࡢヲ⣽ࡘ࠸࡚♧ࡍࠋ ᐊෆ࠾ࡅࡿ㟁Ἴᑕ⋡ࡢ ᐃ ᅗ 4 ࣔࢹࣝࡋࡓ㆟ᐊࡢ┿ࢆ♧ࡍࠋࡲࡓᅗ 5 㸪 ㆟ᐊෆ࠾࠸࡚ᑕ⋡ࡢᐇ ࢆ⾜ࡗࡓྛ⟠ᡤࢆ♧ࡍࠋ ࡇࡇ࡛ᑕ⋡ࡢᐇ ࢆ⾜࠺ࡣ㸪㟁Ἴࡢᑕ⋡ࡢᇶ‽ ࣞ࣋ࣝ࡞ࡿ㔠ᒓᯈࡢᑕ⋡ࢆ ᐃࡍࡿᚲせࡀ࠶ࡿࠋ ࡍ࡞ࢃࡕ㸪ᅗ 6 ♧ࡍࡼ࠺ቨ㠃㟁Ἴࡀධᑕࡋࡓࡢ ᑕ⋡*1ࢆ ᐃࡍࡿྠ㸪ቨ㠃ࡢ⾲㠃ࢆ㔠ᒓᯈ ࡋࡓሙྜࡢᑕ⋡*2 ࢆ ᐃࡋࡓୖ࡛㸪୧⪅ࡢẚࢆࡾ㸪 ᭱⤊ⓗᑕ⋡ *= *1 /*2ࡋ࡚ᚓࡽࢀࡿࠋ ࡇࡇ࡛㸪㔠ᒓᯈࡣᑟ㟁⋡ࡢ㧗࠸࣑ࣝࢽ࣒࢘ᯈࡸ 㖡ᯈࡀ⏝࠸ࡽࢀ㸪ཌࡉࡣ༑ศⷧࡃ࡚ࡶ⌮ⓗ࡞ᑕ 㠃ࡋ࡚స⏝ࡍࡿࡀ㸪ᑕࡋࡓ㟁Ἴ࢚ࢿࣝࢠ࣮ࡣࣥ ࢸࢼࡽቨ㠃ࡲ࡛ࡢ ㊥㞳࠾࠸࡚ⴭࡋࡃῶ⾶ࡍࡿ ࡓࡵ㸪୧⪅ࡢ ᐃࡣྠࡌ㊥㞳ࢆಖࡗ࡚⾜࠺ᚲせࡀ࠶ࡿࠋ ᅗ 4 ࢩ࣑࣮ࣗࣞࢩࣙࣥࣔࢹࣝࡋࡓ㆟ᐊ ᅗ 5 ㆟ᐊෆ࠾ࡅࡿᑕ㔞ࡢᐇ ⟠ᡤ ᅗ 6 ᑕ⋡ ᐃ࠾ࡅࡿᇶ‽ ࡞࠾㸪*1 ,*2ࡣࡑࢀࡒࢀධᑕἼࡢ㟁⏺ Ei࠾ࡼࡧᑕἼࡢ 㟁⏺ Er1ࡢẚࡋ࡚㸪*1 = Er1 /Eiࡋ࡚ᐃ⩏ࡉࢀ㸪ྠᵝ 㸪*2 = Er2 /Ei࡞ࡿࠋᅗ 7 ㆟ᐊෆ࠾ࡅࡿᑕ⋡ ࡢ ᐃࡢᵝᏊࢆ♧ࡍࠋ ᐃ⏝ࡋࡓ㔠ᒓᯈࡣ 400mm 400mm ࡢ࣑ࣝࢩ࣮ࢺ࡛࠶ࡾ㸪ཌࡳࡣ 0.3mm ࡛࠶ࡿࠋ ࡞࠾ᅗ 5 ♧ࡋࡓ ᐃ⟠ᡤࡢ୰࡛᳜᱂ࡘ࠸࡚ࡣ㔠ᒓᯈ ࡢタ⨨ࡀᅔ㞴࡞ࡿࡓࡵ㸪ࡢ ᐃ⟠ᡤ࠾ࡅࡿྠ㊥ 㞳ࡢ㔠ᒓᯈࡢᑕ⋡ࡢ ᐃ್ࢆ௦⏝ࡋࡓࠋ ᅗ 7 ㆟ᐊෆ࠾ࡅࡿᑕ ᐃࡢᵝᏊ ఏ㏦⥺㊰⌮ㄽᇶ࡙ࡃ➼౯ⓗ࡞ㄏ㟁⋡ࡢ⟬ฟ ᑕ⋡*ࢆㄏ㟁⋡H⨨ࡁ࠼ࡿࡓࡵࡣ㸪ఏ㏦⥺㊰ ⌮ㄽࡼࡿᑕ⋡ィ⟬ᘧᇶ࡙ࡁ㏫⟬ࢆ⾜࠺ᚲせࡀ࠶ ࡿࠋᅗ 8 ♧ࡍࡼ࠺ఏ㏦⥺㊰⌮ㄽࡢィ⟬ࣔࢹࣝࡣ㸪 (a)㟁Ἴࡀධᑕࡍࡿᮦᩱࡀ↓㝈ࡢཌࡉ࡛࠶ࡿࢆ௬ᐃࡋ ࡓሙྜ㸪(b) ᮦᩱࡀ᭷㝈ࡢཌࡉ࡛࠶ࡾཌࡳ d ࢆ᭷ࡍࡿሙ ྜ㸪(c)␗࡞ࡿㄏ㟁⋡ࡢᮦᩱࡀ✚ᒙࡉࢀ࡚࠸ࡿሙྜࡢ 3 ࡘࡀ⪃࠼ࡽࢀࡿࠋ ᅗ 9 ᅗ 8 ࡢࣔࢹࣝࢆゎࡃࡓࡵࡢ➼౯ᅇ㊰ࢆ♧ࡍࠋᅗ 9(a)ࡢሙྜ㸪ධᑕഃࡢ✵㛫㡿ᇦ㸦Section 1㸧ཬࡧᮦᩱࡢ 㡿ᇦ㸦Section 2㸧࠾ࡅࡿἼືࣥࣆ࣮ࢲࣥࢫ㸦㟁⏺ ☢⏺ࡢẚ㸧ࡣ㸪ࡑࢀࡒࢀ Z0㸦=376. 7Ȑ㸧㸪Z0 /ξߝ ࡞ ࡿࠋࡇࡢࡁ㸪ᑕ⋡ࡣୗᘧ࡛࠼ࡽࢀ㸪ࡇࡢᘧࡼࡾ ẚㄏ㟁⋡ߝࢆᑟฟ࡛ࡁࡿࠋ࡞࠾㸪ẚㄏ㟁⋡ߝࡣ✵Ẽ୰ࡢ ㄏ㟁⋡ߝࡢẚ࡛ᐃ⩏ࡉࢀࡿ್࡛࠶ࡿࠋ 䡲䢚䢓䡹䢆䢛䡬䡿䡤䡸䡪䢙 䡸䡹䡿䢍ኳ䠄ᒾ⥥྾㡢ᯈ䠅 ᳜᱂ ொჾ 䡼䡮䢕䡲䡬䢉䢛䡫䢀 䡹䡽䡬䢕〇䢀䢚䡭 ▼⭯䢊䢚䡬䢀䢚ቨ 㻹㼑㼠㼍㼘㻌㼜㼘㼍㼠㼑 㻭㼚㼠㼑㼚㼚㼍㻌㻔㻮㻮㻴㻭㻥㻝㻞㻜㻮㻕 r r 0 0 r r 0 0 / 1 | | / 1 Z Z Z Z
H
H
H
H
* 2 r 21 |
|
1 |
|
H
*
?
*
Ei Er1 㻹㼑㼠㼍㼘㻌㻼㼘㼍㼠㼑 Ei Er2 *1= Er1/ Ei *2= Er2/ Ei *= *1/ *2ᅗ 8(b)ཬࡧ(c)ࢆゎࡃࣔࢹࣝࡣ㸪ᅗ 9(b)♧ࡍࡼ࠺⫼ 㠃ࡢ✵㛫㡿ᇦࡢࣥࣆ࣮ࢲࣥࢫࢆඛ⪃࠼㸪↓㝈⥆ ࡃ⫼㠃ࡢ✵㛫ࢆ Z0ࡢ㈇Ⲵࣥࣆ࣮ࢲࣥࢫぢ࡞ࡍࠋࡑ ࡋ࡚㸪ᮦᩱࡢ㡿ᇦ㸦Section 2㸧ࡢ๓㠃ࡽぢࡓධຊࣥ ࣆ࣮ࢲࣥࢫ Zinࢆồࡵࢀࡤቃ⏺ࢆ୍ࡘᾘཤࡍࡿࡇࡀ࡛ ࡁ㸪(a)ྠᵝ⪃࠼ࡿࡇࡀ࡛ࡁࡿࠋ ࡞࠾㸪ᑕ⋡ࡢᐇ ್ࡼࡾㄏ㟁⋡ߝࢆồࡵࡿሙྜ㸪 ᐇ㝿ࡢቨෆ㒊ࡢᮦ㉁ࢆ࡚ᆒ୍࡞ᮦᩱ௬ᐃࡍࡿࡇ ୍࡛ࡘࡢㄏ㟁⋡⨨ࡁ࠼࡚࠸ࡿࠋࡍ࡞ࢃࡕ㸪ᑕ⋡ ࡢᐇ ್ࢩ࣑࣮ࣗࣞࢩࣙࣥୖࡢᑕ⋡ࡀྠࡌ࡞ࡿ ࡼ࠺ᐃ⩏ࡋࡓ➼౯ⓗ࡞ㄏ㟁⋡࡛࠶ࡿࠋࡲࡓ㸪ཝᐦ ࡣᑕ⋡ࡣ㸪┦ሗࡲ࡛ྵࡴ」⣲ᑕ⋡ࡋ࡚ᢅ࠺ ᚲせࡀ࠶ࡿࡀ㸪ᮏሗ࡛ࡣ ᐃࡢ౽ᐅୖ㸪⤯ᑐ್㸦ࡁ ࡉ㸧ࡢࡳᐇ ࢆ⾜ࡗ࡚࠸ࡿࠋ (a) ↓㝈㛗ᮦᩱ㸦௬ᐃ㸧 (b) ᭷㝈㛗ᮦᩱ (c) ✚ᒙᮦᩱ ᅗ 8 ఏ㏦⥺㊰⌮ㄽ࠾ࡅࡿᑕࣔࢹࣝ (a) ↓㝈㛗ᮦᩱ (b) ᭷㝈㛗ᮦᩱ࠾ࡼࡧ✚ᒙᮦᩱ ᅗ 9 ᅗ 8 ࡢ➼౯ᅇ㊰ ᐊᙧ≧ࡢࣔࢹࣝ ᅗ 10 ᑕ⋡ࡢᐇ 㠃࡛ᵓᡂࡋࡓࢩ࣑࣮ࣗࣞࢩࣙࣥ ࣔࢹࣝࢆ♧ࡍࠋᅗ୰ᑕ⋡ࡢᐇ ್ࡶేࡏ࡚♧ࡋ࡚ ࠸ࡿࠋ୍ࡋ࡚㸪ࣔࢹࣝ୰ࡢࢹࢫࢡ㸦ྑഃ㸧ࡽ㧗 ࡉ 0.15m ࡢ⨨࿘Ἴᩘ 2.45GHz ࡢἼ※ࢆタᐃࡋࡓ ࡢࢹࢫࢡୖ㸦㧗ࡉ 0.7m㸧ࡢ㟁Ἴᙉᗘศᕸࡢࢩ࣑࣮ࣗࣞ ࢩࣙࣥ⤖ᯝࢆᅗ 11 ♧ࡍࠋࡇࡢ⤖ᯝࡼࡾ㸪ᨺᑕࡉࢀࡓ 㟁Ἴࡣ࿘ᅖࡽࡢᑕἼᖸ΅ࡍࡿࡇ࡛㸪㟁Ἴࡢᗈ ࡀࡾࡀᆒ୍㸦ྠᚰ≧㸧࡛ࡣ࡞ࡃ㸪ᙉᙅࡀධࡾΰࡌࡗ ࡓศᕸ࡞ࡿࡇࡀศࡾ㸪ᑕ⋡ࡀࢩ࣑࣮ࣗࣞࢩࣙ ࣥᫎࡉࢀ࡚࠸ࡿࡇࡀ☜ㄆ࡛ࡁࡿࠋ ࡞࠾㸪༢ dBm ࡣ 1mW㸦࣑ࣜ࣡ࢵࢺ㸧ࢆ 0dBm ࡋ ࡚ᐃ⩏ࡉࢀࡿ㟁ຊ್ࡢ༢࡛࠶ࡿࠋࡇࡇ࡛ࡣ㸪㏦ཷಙ ࣥࢸࢼࡋ࡚⌮ⓗ࡞༙Ἴ㛗ࢲ࣏࣮ࣝࣥࢸࢼࢆ ⏝࠸㸪㏦ಙ㟁ຊࢆ 0dBm ࡋ࡚࠸ࡿࠋࡲࡓ㸪ࣞࢺ࣮ࣞ ࢫἲࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ᮲௳ࡋ࡚ࡣ㸪୍ࡋ࡚㸪 ᑕࢆ⧞ࡾ㏉ࡍୖ㝈ᅇᩘࢆ 3 ᅇタᐃࡋ࡚࠸ࡿࠋ ᅗ 10 ᑕ㸭㏱㐣㠃࡛ᵓᡂࡋࡓゎᯒࣔࢹࣝ ᅗ 11 ᅗ 10 ࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ㸦㧗ࡉ 0.7m㸧 ᐇ ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢᩚྜᛶ᳨ド ᐇ ᴫせ ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࡢጇᙜᛶࢆ᳨ドࡍࡿࡓࡵ㸪 㟁Ἴᙉᗘศᕸࡢᐇ ࢆ⾜ࡗࡓࠋ㒊ᒇయࡢศᕸࢆ⊃ࣆ ࢵࢳྲྀᚓࡍࡿ ᐃⅬᩘࡀ⭾࡞ࡾ㸪ᐇ ⮬యࡀ ᅔ㞴࡞ࡿࡓࡵ㸪୍ࡋ࡚ᅗ 12 ♧ࡍࡼ࠺࡞ 2 ᮏࡢ ᐇ ࣛࣥ(L1, L2)ࢆタᐃࡋࡓࠋL1 ཬࡧ L2 ࡢ㊥㞳 2.4m ᑐࡋ࡚ 50mm 㛫㝸࡛ྛ 49 Ⅼࡢᐇ ࢆ⾜࠸㸪ྜィ 98 Ⅼ ࠾ࡅࡿᐇ ್ࢆྲྀᚓࡋࡓࠋ -ᾅ -ᾄᾄ -ᾄ -ᾂᾄ -ᾂ -ᾁᾄ -ᾁ ᾕᾸᾴΆᾳ ῂῃ῁ᾴ᾽ᾶῃᾷ ᵹᾳᾑᾼᵻ -ᾃᾄ -ᾃ * = 0.31 * = 0.47 * = 0.26 * = 0.92 * = 0.16 * = 0.45 Wave source (@ 2.45GHz) 0.15m 0.15m 3.6m
H
rH
r2H
r1d
2d
1d
rH
Z /0 Z0 Z0 Z /0H
r Z0Section 1 Section 2 Section 3
Section 2 Zin Section 1 Zin Z0 Section 1 STEP 2 Zin Section 2 + 3 Z0 d d STEP 1 r
H
Z /0 Z0 ZL Section 1 Section 2 Section 1 0 376.6 [ ] Z # : 0 r (ZL Z /H
)H
rᅗ 12 ཷಙ㟁ຊศᕸࡢᐇ ࣛࣥ࠾ࡼࡧᐇ ᵝᏊ ᐇ ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢẚ㍑ ᅗ 13(a) L1 ୖ 49 Ⅼ࠾ࡅࡿᐇ ⤖ᯝేࡏ࡚㸪 ᑕ 1 ᅇࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝཬࡧ⮬⏤✵㛫࠾ࡅࡿῶ ⾶࣮࢝ࣈࡢ⌮ㄽ್ࢆ♧ࡍࠋྠᅗ(b)ࡣᐇ ⤖ᯝేࡏ࡚㸪 ᑕ 3 ᅇࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࢆ♧ࡋ࡚࠸ࡿࠋࡇࡢ⤖ ᯝࡼࡾ㸪(a)࠾ࡅࡿῶ⾶࣮࢝ࣈࡣࣞ࣋ࣝࡀ༢ㄪῶᑡ ࡍࡿࡢᑐࡋ࡚㸪ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ࠾ࡼࡧᐇ ⤖ ᯝࡣ࿘ᅖࡢᑕᙳ㡪ࡼࡾ」㞧ኚືࡍࡿࡇࡀ☜ㄆ ࡛ࡁࡿ㸬ࡲࡓ㸪(a)ẚ࡚(b)ࡢ᪉ࡀᐇ ್㏆࠸⤖ᯝ ࡀᚓࡽࢀ࡚࠸ࡿࠋࡲࡓ㸪ᅗ 14(a), (b)࡛ࡣ㸪㊥㞳ᑐࡍ ࡿኚືࡀ≉ࡁࡃ࡞ࡿ⨨࠾࠸࡚㸪ࢩ࣑࣮ࣗࣞࢩ ࣙࣥ⤖ᯝᐇ ್ࡢ㛫ࡁ࡞ᕪࡀ⏕ࡌ࡚࠸ࡿ㸬ࡇ ࡢ⌮⏤ࡋ࡚ձ2.45GHz ࡢἼ㛗㸦⣙ 120mm㸧ᑐࡍࡿ ᐇ ⨨ࡢ⢭ᗘ㉳ᅉࡍࡿㄗᕪ㸪ղゎᯒୖࡢ⌮ⓗ࡞ ࣥࢸࢼᐇ㝿ࡢ༙Ἴ㛗ࢲ࣏࣮ࣝࣥࢸࢼࡢ≉ᛶୖ ࡢㄗᕪࡀ⪃࠼ࡽࢀࡿࠋ࡞࠾㸪ᐇ ್ࢆᇶ‽ࡋࡓ 3 ᅇ ᑕࡢࢩ࣑࣮ࣗࣞࢩ್ࣙࣥࡢᖹᆒ೫ᕪ㸦⤯ᑐ೫ᕪ㸧ࡣ㸪 L1࠾࠸࡚ 6.06dB㸪L2 ࠾࠸࡚ 4.49dB ࡛࠶ࡗࡓࠋ ḟ㸪ᅗ 15 ♧ࡍࡼ࠺ᐇ㝿↓⥺ LAN ࢡࢭࢫ࣏ ࣥࢺ (I-O DATA)ࢆ⏝࠸㸪ࢲࣉࢱ(ORiNOCO)ࢆࣀ࣮ ࢺࣃࢯࢥࣥ╔ࡋ࡚ཷಙࢆ⾜ࡗࡓሙྜࡢཷಙ㟁ຊ ᐃ ࢆ ⾜ ࡗ ࡓ ࠋ ᐃ ࡣ ᑓ ⏝ ࢯ ࣇ ࢺ ࢘ ࢙ AirMagnet Ver.3.2ࢆ⏝࠸㸪L1 ࠾ࡼࡧ L2 ୖ࠾࠸࡚ 0.6m 㛫㝸࡛ྛ 5Ⅼࢆ ᐃࡋࡓࠋᅗ 16 ᐃ⤖ᯝᑕ 3 ᅇࡢࢩ࣑ࣗ ࣮ࣞࢩࣙࣥ⤖ᯝࢆేࡏ࡚♧ࡍࠋࡇࡢ⤖ᯝࡼࡾ㸪L1 ࠾ࡼ ࡧ L2 ࡶᐇ ್ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࡣᩚྜࡍࡿ ࡇࡀ☜ㄆ࡛ࡁ㸪↓⥺ LAN ࢡࢭࢫ࣏ࣥࢺ࿘ᅖࡢ㟁 Ἴ⎔ቃࢆ㐺ษண ࡛ࡁࡿࡇࡀ☜ㄆ࡛ࡁࡿࠋ ࡲࡵ ᮏሗ࡛ࡣ㸪ᗄఱගᏛ㏆ఝࢆ⏝࠸ࡓ㟁Ἴ⎔ቃࡢண ᡭ ἲࡋ࡚㸪ᐊෆ࠾ࡅࡿ㟁Ἴࡢᑕ㸭㏱㐣≉ᛶ╔┠ ࡋࡓࣔࢹࣝᡭἲࢆᥦࡋ㸪ࡑࡢጇᙜᛶࡢ᳨ドࢆᢏ⾡ ◊✲ᡤෆࡢ㆟ᐊ࡛⾜ࡗࡓࠋ⤖ᯝࡋ࡚㸪ᐇ ್ࢆᇶ ‽ࡋࡓࢩ࣑࣮ࣗࣞࢩࣙࣥࡢᖹᆒ೫ᕪ 6.06dB ࡢ⢭ᗘࡀ ᚓࡽࢀ㸪ᑕ⋡ࡢᐇ ࢹ࣮ࢱࢆࣞࢺ࣮ࣞࢫἲࢩ࣑ࣗ ࣮ࣞࢩࣙࣥධຊࡍࡿࡇ࡛」㞧࡞ᐊෆ㟁Ἴ⎔ቃࢆண ᅗ 13 L1 ࠾ࡅࡿࢩ࣑࣮ࣗࣞࢩࣙࣥཬࡧᐇ ⤖ᯝ ᅗ 14 L2 ࠾ࡅࡿࢩ࣑࣮ࣗࣞࢩࣙࣥཬࡧᐇ ⤖ᯝ -80 -70 -60 -50 -40 -30 -20 -10 0 0 0.4 0.8 1.2 1.6 2 2.4 Rece ive d power [dBm ] Simulated (3rd reflection) Measured Position on Line2 [M] -80 -70 -60 -50 -40 -30 -20 -10 0 0 0.4 0.8 1.2 1.6 2 2.4 Receive d p o wer [d Bm ] Simulated (1st reflection) Measured Theoretical attenuation in free-space Position on Line2 [M] -80 -70 -60 -50 -40 -30 -20 -10 0 0 0.4 0.8 1.2 1.6 2 2.4 Rece iv ed powe r [ d Bm ] Simulated (3rd reflection) Measured Position on Line1 [M] -80 -70 -60 -50 -40 -30 -20 -10 0 0 0.4 0.8 1.2 1.6 2 2.4 R ece iv ed po we r [d Bm ] Position on Line1 [M] Simulated (1st reflection) Measured Theoretical attenuation in free-space (a) 1ᅇᑕ (b) 3ᅇᑕ (a) 1ᅇᑕ (b) 3ᅇᑕ [m] [m] [m] [m] Tx. Rx. Ȣ/2 antenna Ȣ/2 antenna 3.6m 2.4m L2 L1 2.4m
࡛ࡁࡿࡇࡀ☜ㄆ࡛ࡁࡓࠋࡼࡾ⢭ᗘࡢ㧗࠸ࢩ࣑ࣗࣞ ࣮ࢩࣙࣥࢆᐇ⌧ࡍࡿ୍ࡘࡢ᪉ἲࡋ࡚㸪ᑕ㔞ࡢධຊ ್ࡋ࡚ᖜ㸦ࡁࡉ㸧ࡢሗࡔࡅ࡛ࡣ࡞ࡃ㸪┦ ሗࢆຍ࠼ࡿ࡛㸪ቨ㠃ෆ㒊ࡢ㕲➽ࡸ LGS ➼ࡢ㔠ᒓࡽ ࡢᑕἼࢆࡼࡾṇ☜ィ⟬࡛ࡁࡿ⪃࠼ࡽࢀࡿࠋ ᚋ㸪ቨ㠃ࡽࡢᑕἼࡢ┦ࢆ⪃៖ࡋࡓࢩ࣑ࣗࣞ ࣮ࢩࣙࣥࢆ⾜࠼ࡿࡼ࠺ࡍࡿࡀㄢ㢟࡛࠶ࡿࠋࡲࡓ㸪 ࡼࡾṇࡋ࠸ධຊ್ࢆ☜ಖࡍࡿࡓࡵ㸪㟁Ἴᬯᐊࢆ⏝ ࡋ࡚ྛ✀ᮦᩱࡢᑕ⋡ᐇ ್ࢆᇶࢹ࣮ࢱ࣮࣋ࢫࢆ ᅗࡾ㸪ྛ✀≀௳ᑐᛂ࡛ࡁࡿゎᯒ⎔ቃࢆᵓ⠏ࡋ࡚࠸ࡁ ࡓ࠸⪃࠼ࡿࠋ ࡓ ᅗ 15 AirMagnet ࡼࡿཷಙࣞ࣋ࣝ ᐃ ㅰ ㎡ ົᡤࣅࣝ࠾ࡅࡿ↓⥺ LAN 㟁Ἴ⎔ቃ ᐃ࠾࠸࡚㸪ࡈ༠ຊࢆ㈷ࡾࡲࡋࡓᙜ♫ࢩࢫࢸ࣒ࢭࣥࢱ࣮㛵ಀྛឤㅰ⮴ࡋࡲࡍࠋ ཧ⪃ᩥ⊩ 1㸧ᑠᐑ ୍බ, ᜨẚ᰿ ె㞝, ဴᮁ,͆ࣞࢺ࣮ࣞࢫἲࡼࡿከ㔜Ἴఏᦙ㊰࠾ࡅࡿᇶᆅᒁࣥࢸࢼ≉ᛶࡢホ౯͇, 㟁Ꮚሗ㏻ಙᏛ ᢏ⾡◊✲ሗ࿌, Vol.AP-106, No.302, pp.17-22, 2006㸦ⴭ⪅ᡤᒓ㸸ࢻࢥ࣭ࣔࢸࢡࣀࣟࢪओ㸪NTT ࢻࢥࣔओඹⴭ㸧. 2㸧⡿⃝ ⪽, ๓⏣ ♸ྐ, ᐑ Ꮫ͆ொჾࢆഛ࠼ࡓ࢜ࣇࢫ⎔ቃ࠾ࡅࡿ 2.4/5GHz ᖏ↓⥺ LAN ࢩࢫࢸ࣒ࡢᒇෆఏᦙ≉ᛶ͇, ᫎീሗ࣓ ࢹᏛᢏ⾡ሗ࿌, Vol.37, No.34, pp.21-24, 2013㸦ⴭ⪅ᡤᒓ㸸ᾏ㐨Ꮫ㸧.㻌 3㸧ᯘ ಇග, ᒣᮏ , ᑠᕝ ୍, ͆ᒇእఏᦙᐇ㦂࠾ࡅࡿࣞࢺ࣮ࣞࢫࢆ⏝࠸ࡓ㟁Ἴఏᦙ≉ᛶࡢゎᯒ͇, 㟁Ꮚሗ㏻ಙᏛᢏ⾡◊ ✲ሗ࿌, Vol.AP-108, No.5, pp.7-12, 2008㸦ⴭ⪅ᡤᒓ㸸ᯇୗ㟁ჾ⏘ᴗओ ⌧ࣃࢼࢯࢽࢵࢡओ㸧.
A METHOD FOR PREDICTING INDOOR ENVIRONMENT OF EM-WAVE
BESED ON EXPERIMENTAL DATA OF INTERIOR REFLECTION/TRANSMISSION
BY GEOMETRICAL OPTICS APPROACH
T.Watanabe and T.Kawase
In this report, a method for predicting indoor environment of EM-wave by geometrical optics approach is introduced. Indoor propagations of EM-wave form complex path of propagation due to reflection from a floor, a ceiling, walls, and surrounding fixture and furniture. Hence, these reflection and transmission characteristics need to be input to simulation precisely for predicting indoor environment properly. At first, a modeling method, based on measured data of interior reflection and transmission characteristics, was proposed. Next, environment of indoor Wireless LAN was predicted, at a room in Institute of Technology as an example, to demonstrate validity of the method. As a result, the average deviation of simulated results, on the basis of measurement results, was up to 6.06dB.
-80 -70 -60 -50 -40 -30 -20 -10 0 0 0.4 0.8 1.2 1.6 2 2.4 Rec eived power [dBm ] Simulated (3rd reflection) Measured by AirMagnet Ver.3.2
Position on Line2 [M] -80 -70 -60 -50 -40 -30 -20 -10 0 0 0.4 0.8 1.2 1.6 2 2.4 Re ce ive d pow er [ d Bm ] Simulated (3rd reflection) Measured by AirMagnet Ver.3.2
Position on Line1 [M] ᅗ 16 ᑕ 3 ᅇ࠾ࡅࡿࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ࠾ࡼࡧ AirMagnet ィ ್ (a) L1 (b) L2 [m] [m] Wi-Fi analyzer (AirMagnet Ver.3.2)
Wireless LAN adapter (ORiNOCO 11a/b/g 8480-JP)
Access point 11b/g (WN-AG/A / I-O DATA)
