ᮾᛴᘓタᢏ⾡◊✲ᡤሗ No.40
東急建設技術研究所報 No.40

U.D.C 537.87

ᗄఱගᏛ㏆ఝࢆ⏝࠸ࡓ཯ᑕ㸭㏱㐣ࡢᐇ ࢹ࣮ࢱ࡟ᇶ࡙ࡃ
幾何光学近似を用いた反射／透過の実測データに基づくᐊෆ㟁Ἴ⎔ቃண ᡭἲ

U.D.C 537.87

室内電波環境予測手法

渡辺＊＊ 㸨㸨
拓人
川瀬隆治㝯἞
Ώ㎶ ᣅேᕝ℩せ ⣙㸸  ᘓ≀ࡢ୰࡛ࡢ㟁Ἴఏᦙࡣ㸪ቨ㸪ᗋ㸪ኳ஭ཬࡧொჾ࠿ࡽࡢ཯ᑕ࡟ࡼࡗ࡚」㞧࡞ఏᦙ⤒㊰ࢆᙧᡂࡍࡿࡓࡵ㸪ᒇእࡢࡼ࠺࡞ぢ㏻ࡋෆఏᦙ࡜ࡣ኱ࡁࡃ␗࡞ࡾ㸪ࡇࢀࢆ⌮ㄽⓗ࡟ィ⟬ࡍࡿࡓࡵࡢࣔࢹࣝ໬ࡣ୍⯡࡟ᅔ㞴࡛࠶ࡿࠋᮏሗ࿌࡛ࡣ㸪ቨ㸪ᗋ㸪ኳ஭ࡢ཯ᑕ㸭㏱㐣≉ᛶࡢᐇࢹ࣮ࢱ࡟ᇶ࡙ࡃࣔࢹࣝ໬ᡭἲࢆᥦ᱌ࡋ㸪ᚑ᮶㸪ᦠᖏ㟁ヰᇶᆅᒁ➼ࡢᒇእ㟁Ἴఏᦙゎᯒ࡟⏝࠸ࡽࢀࡿᗄఱගᏛ㏆ఝ

㸦Ray-trace ἲ㸧࡜ࡢే⏝࡟ࡼࡿᐊෆ㟁Ἴ⎔ቃண࡚㸪ᐊෆࡢ↓⥺ LAN ⎔ቃࢆணࡋࡓ⤖ᯝ㸪ᐇ

ᡭἲ࡟ࡘ࠸᳨࡚ドࢆ⾜ࡗࡓࠋ୍౛࡜ࡋ࡚㸪ᢏ⾡◊✲ᡤෆࡢ఍㆟ᐊࢆࣔࢹࣝ໬ࡋ

್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࡟                      ࣔࢹࣝ໬ࡢᡭ㡰     ᚑ᮶ᡭἲ                     ᐇ࡜ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢᩚྜᛶ᳨ド     ᥦ᱌ᡭἲࡢᴫせ                  ࡲ࡜ࡵ ࡣࡌࡵ࡟㐺⏝ࡋ㸪ᅗ 1 ࡢࡼ࠺࡞㟁Ἴ⎔ቃࡢணࢆ⾜࠺ሙྜ㸪ᐊෆࡢொჾ➼ࢆྵࡵࡓヲ⣽࡞ࣔࢹࣝ໬ࡸ㸪ྛ㒊ᮦ࠿ࡽࡢ཯

ࢫ࣐࣮ࢺࣇ࢛ࣥࡸ↓⥺ LAN ᦚ㍕ࢹࣂ࢖ࢫࡢᛴ㏿࡞ᬑᑕ⋡ࢆṇ☜࡟⾲⌧ࡍࡿࡇ࡜ࡀᚑ᮶ࡣᅔ㞴࡜ࡉࢀ࡚࠸ࡓࠋཬ࡟ࡼࡾ㸪ᦠᖏ㟁ヰᅇ⥺௨እ࡟ࡶ Wi-Fi ࡟ࡼࡿࢹ࣮ࢱ㏻
ಙࢆ฼⏝ࡍࡿᶵ఍ࡀቑ࠼࡚ࡁ࡚࠸ࡿࠋၟᴗ᪋タ㸪ᒎ♧఍఍ሙࡢࡼ࠺࡞ᗈ࠸✵㛫࡛ Wi-Fi ࢧ࣮ࣅࢫ࢚ࣜ࢔ࢆᥦ౪

Wireless LAN (2)ࡍࡿሙྜ㸪฼⏝⪅ࡀᡤᣢࡍࡿ Wi-Fi ➃ᮎࡲ࡛༑ศ࡟㟁ἼEASTࡀᒆࡃࡼ࠺࡟㸪㏻ಙࢭࣝタィࡸ㸪ྛࢭࣝ㛫࠾ࡼࡧእ᮶ࡢ㟁Ἴ࡜ࡢᖸ΅ࢆ㜵ṆࡍࡿࡓࡵࡢࢳࣕࣥࢿࣝタィࡀᚲWireless LAN (1)せ࡟࡞ࡿࠋࡇࡇ࡛㸪ᘓ≀ᙧ≧ࡸ↓⥺ LAN ࢔ࢡࢭࢫ࣏࢖ࣥࢺࡢ㓄⨨᮲௳➼ࡢ᝟ሗࢆᇶ࡟㸪ᘓ≀ෆ࡟࠾ࡅࡿ㟁Ἴ⎔ቃ㸦㟁Ἴᙉᗘศᕸ㸧ࢆ㐺ษ࡟ண

Wireless LAN (3)࡛ࡁࢀࡤ㸪ࡇࡢ✀ࡢ᳨ウࢆᐜ᫆࡟⾜࠼ࡿࡼ࠺࡟࡞ࡿࠋWEST୍౛࡜ࡋ࡚㸪ᅗ 1 ࡟᯾஦ົᡤࣅࣝ࡟࠾ࡅࡿ↓⥺ LAN㟁Ἴ⎔ቃࡢᐇ

Field Strength [dBm] @ 2.4GHz band౛ࢆ♧ࡍ㸦ᅗ୰ࡢ༢఩ dBm ࡣ㟁ຊ್ࢆ

-63 -61 -59 -57 -55 -53 -51 -49 -47 -45 -43 -41 -39 -37 -35⾲ࡍ㸧ࠋྠᅗ(a)ࡣ㸪↓⥺ LAN ࡢ࢔ࢡࢭࢫ࣏࢖ࣥࢺᩘࡀ 3(a) Type-A࡛࠶ࡾ㸪(b)ࡣ࢔ࢡࢭࢫ࣏࢖ࣥࢺᩘࡀ 4 ࡛࠶ࡿࠋࡇࡢࡓ
ࡵ㸪(a)࡛ࡣ㟁Ἴࡢᙅ࠸࢚ࣜ࢔ࡀ୍㒊Ꮡᅾࡍࡿࡀ㸪(b)࡛
ࡣ㟁Ἴ⎔ቃࡀᨵၿࡉࢀ඲య࡟㟁Ἴࡀᗈࡀࡗ࡚࠸ࡿࡇ࡜ࡀศ࠿ࡿࠋࡇࡢࡼ࠺࡞ᐇ

⤖ᯝࢆᇶ࡟࢔ࢡࢭࢫ࣏࢖ࣥ

ࢺࡢ㓄⨨タィࢆ⾜࠺஦ࡣྍ⬟ࡔࡀ㸪ᐇ

࡟ከࡃࡢ

EAST

ᐃ

࣏࢖ࣥࢺᩘࢆᚲせ࡜ࡍࡿࡇ࡜ࡸ㸪᪤Ꮡࡢ஦ົᡤ࡛ࡣᇳ

Wireless LAN (2)ົ᫬㛫ᖏእ࡟⾜࠺ᚲせࡀ࠶ࡿ➼ࡢၥ㢟ࢆ᭷ࡍࡿࠋ
Wireless LAN (1)ᚑ᮶㸪ᒇእ㟁Ἴఏᦙࢆࢩ࣑࣮ࣗࣞࢩࣙࣥࡍࡿ᪉ἲ࡜

Wireless LAN (4)ࡋ࡚ᗄఱගᏛ㏆ఝᡭἲ࡛࠶ࡿࣞ࢖ࢺ࣮ࣞࢫ(Ray-trace)ἲ
࡜࿧ࡤࢀࡿ᪉ἲࡀ୍⯡ⓗ࡟⏝࠸ࡽࢀ࡚࠸ࡿࠋࡇࡢᡭἲ

Wireless LAN (3)WESTࡣᅗ 2 ࡟♧ࡍࡼ࠺࡟㸪ᒇእ࡟࠾ࡅࡿᦠᖏ㟁ヰᇶᆅᒁ➼ࡢ㟁Ἴఏᦙゎᯒ࡟⏝࠸ࡽࢀ࡚࠾ࡾ 1)㸪ᇶᆅᒁࡀ࢝ࣂ࣮ࡍࡿ

Field Strength [dBm] @ 5GHz band࢚ࣜ࢔ࡢ᥎ᐃ࡟ά⏝ࡉࢀ࡚࠸ࡿࠋࣞ࢖ࢺ࣮ࣞࢫἲࡣ㸪-63 -61 -59 -57 -55 -53 -51 -49 -47 -45 -43 -41 -39 -37 -35㟁Ἴࢆ↓ᩘࡢࣞ࢖㸦ග⥺㸧࡜ぢ࡞ࡋ㟁Ἴࡢ㌶㊧ࢆࢺࣞ(b) Type-B࣮ࢫࡍࡿࡇ࡜࡛㸪㟁Ἴࡢ㏦ಙ㟁ຊ࡟ᑐࡍࡿ┦ᑐⓗ࡞ཷᅗ 1 ↓⥺ LAN 㟁Ἴ⎔ቃࡢᐇಙ㟁ຊࢆồࡵࡿᡭἲ࡛࠶ࡿࠋࣞ࢖ࢺ࣮ࣞࢫἲࢆᐊෆ࡟
*ᘓ⠏ᮏ㒊
建築本部 技術部
音響・電磁環境Gᢏ⾡㒊㡢㡪࣭㟁☢⎔ቃ
G

67
67

⤖ᯝ౛

東急建設技術研究所報 No.40

໬࡟࠾࠸࡚㸪ࣔࢹࣝࢆᵓᡂࡍࡿせ⣲ࡢ㠃ᩘࡸ㎶ᩘࡣゎᯒୖࡢ཯ᑕ㸭㏱㐣ィ⟬ࡸᅇᢡィ⟬ࡢ㈇Ⲵ࡜࡞ࡿࠋࡲࡓ㸪㟁Ἴࡢ཯ᑕࡸ㏱㐣ࡣㄏ㟁⋡࡜࿧ࡤࢀࡿ≀ᛶ್࡟౫Ꮡࡍࡿࡇ࡜࠿ࡽ㸪㒊ᮦࡈ࡜࡟ṇ☜࡞ㄏ㟁⋡ࢆᐃ⩏ࡍࡿᚲせ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ࡀ࠶ࡿࠋ౛࠼ࡤ㸪ㄏ㟁⋡ࡢ኱ࡁ࠸㔠ᒓࡢࡼ࠺࡞≀య࡛ࡣ཯ᑕࡀ኱ࡁࡃ㸪ㄏ㟁⋡ࡢᑠࡉ࠸ࣉࣛࢫࢳࢵࢡࡸ࢞ࣛࢫ➼࡛ࡣ⌮ㄽୖ཯ᑕࡀᑠࡉࡃ࡞ࡿࠋࡇࡢㄏ㟁⋡ࡢṇ☜࡞್ࢆධᡭࡍࡿࡓࡵ࡟ࡣ㧗⢭ᗘࡢࢿࢵࢺ࣮࣡ࢡ࢔ࢼࣛ࢖ࢨཬࡧ㧗ᗘ࡞ᮦᩱᐃᩘ᥎ᐃᡭἲࡀᚲせ࡜࡞ࡿࠋ㻹㼛㼎㼕㼘㼑㻌㼜㼔㼛㼚㼑ࡇࡢࡼ࠺࡟ᐊෆࡢ」㞧࡞ᙧ≧ࢆヲ⣽࡟ࣔࢹࣝ໬ࡋ㸪ᵓᡂࡍࡿ㒊ᮦࡈ࡜ࡢㄏ㟁⋡ࢆṇ☜࡟ᐃ⩏ࡍࡿᚲせࡀ࠶ᅗ 2 ᚑ᮶ࡢࣞ࢖ࢺ࣮ࣞࢫἲࡢ⏝㏵࢖࣓࣮ࢪ

ࡿ୍᪉࡛㸪ࣔࢹࣝࢆᵓᡂࡍࡿྛせ⣲ࡢ㠃ᩘࡸ㎶ᩘ➼ࡢ」㞧ࡉࡀ཯ᑕ㸭㏱㐣ィ⟬ࡸᅇᢡィ⟬ࡢ㈇Ⲵ࡜࡞ࡿࡓࡵ㸪ࡲࡓ㸪ᚑ᮶ࡢᐊෆゎᯒ࡟ࡣ FDTD ἲ㸦Finite Differenceゎᯒࢆ⾜࠺ୖ࡛ࡢࢺ࣮ࣞࢻ࢜ࣇࡀ⏕ࡌࡿࠋ

Time-Domain㸧ࢆ⏝࠸ࡓ኱つᶍゎᯒࢆࢫ࣮ࣃ࣮ࢥࣥࣆ࣮ࣗࢱ࣮࡟ࡼࡾ⾜ࢃࢀࡓ஦౛ࡀ࠶ࡿࡀ 2)㸪 ┦ᙜࡢࣁ࣮ࢻ ᥦ᱌ᡭἲࡢᴫせ࢙࢘࢔ࡀᚲせ࡜࡞ࡿほⅬ࠿ࡽࠊࡼࡾ⡆᫆࡟ᐇົୖ౑⏝ୖグࡢࡼ࠺࡟ᮦᩱࡢㄏ㟁⋡ࢆ㒊ᮦࡈ࡜࡟ṇ☜࡟ධຊ࡛ࡁࡿ᪉ἲ࡜ࡋ࡚ࣞ࢖ࢺ࣮ࣞࢫἲࡢ౑⏝ࡀᮃࡲࢀ࡚࠸ࡍࡿ஦ࡣ㸪౛࠼ࡤ RC ቨࡢࡼ࠺࡟ࢥࣥࢡ࣮ࣜࢺᮦᩱ࡟ᇙࡿࠋ

ࡵ㎸ࡲࢀࡓ㕲➽࡜ࢥࣥࢡ࣮ࣜࢺࢆศࡅ࡚⪃࠼ࡿᚲせࡀࡑࡇ࡛ᮏሗ࡛ࡣ㸪ቨ㸪ᗋ㸪ኳ஭࠾ࡼࡧொჾࡢ཯ᑕ㸭㏱㐣≉ᛶࡢᐇ࠶ࡾ㸪ࡇࢀࡽࢆヲ⣽࡟ࣔࢹࣝ໬ࡍࡿࡇ࡜ࡣ㸪ࣞ࢖ࢺࣞࢹ࣮ࢱ࡟ᇶ࡙ࡃࣔࢹࣝ໬ᡭἲࢆᥦ᱌ࡋ㸪࣮ࢫἲ࡟࠾࠸࡚ᙧ≧ࡢ㠃ᩘࡸ㎶ᩘࡢ」㞧ࡉ࡟㉳ᅉࡋࡓᚑ᮶㸪ᦠᖏ㟁ヰᇶᆅᒁ➼ࡢᒇእ㟁Ἴఏᦙゎᯒ࡟⏝࠸ࡽ኱ࡁ࡞ィ⟬㈇ᢸ࡜࡞ࡿࠋ

ࢀࡿࣞ࢖ࢺ࣮ࣞࢫἲ࡜ࡢే⏝࡟ࡼࡿᐊෆ㟁Ἴ⎔ቃணࡇࡢࡼ࠺࡞ၥ㢟ࢆゎᾘࡍࡿࡓࡵ࡟㸪ᮏᡭἲ࡛ࡣ㸪ᅗ 3ᡭἲ࡟ࡘ࠸᳨࡚ドࢆ⾜ࡗࡓࠋ୍౛࡜ࡋ࡚㸪ᢏ⾡◊✲ᡤ࡟♧ࡍࡼ࠺࡟ࣔࢹࣝࢆᵓᡂࡍࡿ㒊ᮦ඲య࡜ࡋ࡚ࡢ㟁Ἴෆࡢ఍㆟ᐊࢆࣔࢹࣝ໬ࡋ࡚㸪ᮏᡭἲࡢጇᙜᛶ࡟ࡘ࠸࡚ࢩ࣑࣮ࣗࣞࢩࣙࣥཬࡧᐇࡢ≉ᛶࢆணࡵᐇࡢẚ㍑࡟ࡼࡾ᳨ドࢆ⾜ࡗࡓࠋࢹ࣮ࢱ࡜ࡋ࡚ྲྀᚓࡍࡿࡇ࡜࡛㸪ᐇ್࡛⨨ࡁ᥮࠼ࡓ୍ࡘࡢ㠃࡜ࡋ࡚ᢅ࠺ࠋࡇࢀ࡟ࡼࡗ࡚㸪 ᚑ᮶ᡭἲྛ㒊ᮦࡢᙧ≧ࢆヲ⣽࡟ࣔࢹࣝ໬ࡍࡿᚲせࡀ࡞ࡃ࡞ࡾ㸪ㄏ㟁⋡࣭ᑟ㟁⋡ࡢධຊ್ࡢㄗᕪ࡟㉳ᅉࡍࡿ཯ᑕࣞ࣋ࣝࣞ࢖ࢺ࣮ࣞࢫἲࢆ⏝࠸ࡓᒇእ࡟࠾ࡅࡿᇶᆅᒁ➼ࡢ㟁ࡢィ⟬ㄗᕪࡶゎᾘࡍࡿࡇ࡜ࡀ࡛ࡁࡿࠋἼఏᦙゎᯒ࡛ࡣ㸪࢔ࣥࢸࢼ࠿ࡽᨺᑕࡉࢀࡿ↓ᩘࡢࣞ࢖㻮㼍㼟㼕㼏㻌㼙㼑㼠㼔㼛㼐ࡢ୰࠿ࡽཷಙⅬ࡟฿㐩ࡍࡿࣞ࢖ࢆᢳฟࡋ㸪㟁Ἴࡢ㌶㊧ࢆࢺ࣮ࣞࢫࡍࡿࡇ࡜࡛ཷಙ㟁ຊࡀィ⟬ࡉࢀࡿࠋࣞ࢖ࢺ㻹㼍㼠㼑㼞㼕㼍㼘㻌㻭࣮ࣞࢫἲࡢධຊࢹ࣮ࢱ࡜ࡋ࡚௨ୗࡢ㡯┠ࡀ࠶ࡿࠋ㻹㼍㼠㼑㼞㼕㼍㼘㻌㻮࣭ᵓ㐀≀㸦ᘓ≀㸧ࡢ୕ḟඖᙧ≧ࢹ࣮ࢱ㻼㼞㼛㼜㼛㼟㼑㼐㻌㼙㼑㼠㼔㼛㼐࣭ᵓᡂᮦᩱࡢㄏ㟁⋡㻹㼍㼠㼑㼞㼕㼍㼘㻌㻯࣭࢔ࣥࢸࢼධຊ㟁ຊ㸦W㸸࣡ࢵࢺ㸧䞉㻵㼚㼏㼕㼐㼑㼚㼠㻌㼣㼍㼢㼑࣭ධຊಙྕ࿘Ἴᩘ㸦Hz㸸࣊ࣝࢶ㸧㻹㼍㼠㼑㼞㼕㼍㼘㻌㻰࣭࢔ࣥࢸࢼࡢᣦྥᛶࢹ࣮ࢱ㸦T, I㸸⌫ᗙᶆ⣔㸧ࡇࡇ࡛୕ḟඖᙧ≧ࢹ࣮ࢱࡣ㸪❆㒊࡞࡝ࡢヲ⣽ࡣ┬࠸䞉㻾㼑㼒㼘㼑㼏㼠㼑㼐㻌㼣㼍㼢㼑ࡓ⡆᫆࡞ᘓ≀ࣔࢹࣝࡀ⏝࠸ࡽࢀ࡚࠾ࡾ㸪ᘓ≀ࢆᵓᡂࡍࡿᮦᩱ࡟ࡘ࠸࡚ࡶᘓ≀ෆ㒊ࡢ✵㛫ࡲ࡛ࡣ⪃៖ࡏࡎ㸪ᆒ

ᅗ 3 ᥦ᱌ࣔࢹࣝ໬ᡭἲ୍࡞ࢥࣥࢡ࣮ࣜࢺᮦᩱ࡛ᇙࡵ㎸ࡲࢀࡓࣔࢹࣝ໬ᡭἲࡀ࡜ࡽࢀ࡚ࡁࡓ 1), 3)ࠋࡇࡢࡼ࠺࡞ᒇእ㟁Ἴఏᦙゎᯒࡢሙྜ㸪 ࣔࢹࣝ໬ࡢᡭ㡰ᇶᆅᒁ࠿ࡽᨺᑕࡉࢀࡿ㟁Ἴࡀᘓ≀࡟㐽ࡽࢀ࡚ᙳ࡜࡞ࡿ୍౛࡜ࡋ࡚ᢏ⾡◊✲ᡤෆࡢ఍㆟ᐊࢆᑐ㇟࡜ࡋ࡚㸪ᐊሙᡤࢆ᥈⣴ࡍࡿ஦ࡀ┠ⓗ࡛࠶ࡾ㸪ཝᐦ࡟ᘓ≀ࡢ཯ᑕࡸෆࡢቨ㸪ᗋ㸪ኳ஭ࡢ཯ᑕ㸭㏱㐣≉ᛶࡢᐇ㏱㐣ࢆ⪃៖ࡍࡿᚲせࡣ࡞࠿ࡗࡓࠋࢹ࣮ࢱ࡟ᇶ࡙࠸࡚ࣔࢹࣝ໬ࢆ⾜ࡗࡓࠋ࡞࠾㸪ࣞ࢖ࢺ࣮ࣞࢫἲゎᯒࡋ࠿ࡋ࡞ࡀࡽ㸪ᘓ≀ෆ㒊ࢆゎᯒᑐ㇟࡜ࡍࡿሙྜ㸪ࣞ࡟ࡣᑓ⏝ࢯࣇࢺ࢙࢘࢔ Raplab Ver.4.1㸦ᵓ㐀ィ⏬◊✲ᡤ㸧࢖ࢺ࣮ࣞࢫἲ࡛ࡣձᙧ≧ࡀ」㞧࡟࡞ࡿ࡜ィ⟬࡟ከ኱࡞ࢆ⏝࠸ࡓࠋゎᯒࢆᐇ⾜ࡍࡿࡲ࡛ࡢᡭ㡰ࢆ௨ୗ࡟♧ࡍࠋ᫬㛫ࢆせࡍࡿ㸪 ղᵓᡂ㒊ᮦࡢ≀ᛶ㸦ㄏ㟁⋡㸧ࡀ୍⯡ⓗձ ᐊෆࡢቨ࣭ᗋ࣭ኳ஭ཬࡧொჾࡢ㟁Ἴ཯ᑕ⋡ࡢᐇ࡟ࡣᮍ▱࡛࠶ࡿ㸪࡜࠸࠺ၥ㢟ࢆ᭷ࡍࡿࠋヲ⣽࡞ࣔࢹࣝ68

東急建設技術研究所報 No.40

ղᐇ್ࢆᇶ࡟ఏ㏦⥺㊰⌮ㄽࢆ⏝࠸࡚➼౯ⓗ࡞ㄏ㟁⋡ࢆ㏫⟬ճᐊᙧ≧ࢆ㠃࡛ࣔࢹࣝ໬ࡋྛ㠃࡟ᑐࡋ࡚➼౯ⓗ࡞ㄏ㻹㼑㼠㼍㼘㻌㻼㼘㼍㼠㼑㟁⋡ࡢ๭ࡾᙜ࡚մㄏ㟁⋡ࡀᐃ⩏ࡉࢀࡓᐊᙧ≧ࣔࢹࣝࢆ⏝࠸࡚ Raplab
Ei࡟ࡼࡾࢩ࣑࣮ࣗࣞࢩࣙࣥࢆᐇ⾜௨ୗ࡟ྛᡭ㡰ࡢヲ⣽࡟ࡘ࠸࡚♧ࡍࠋ ᐊෆ࡟࠾ࡅࡿ㟁Ἴ཯ᑕ⋡ࡢEi
Er1Er2*1 = Er1 / Ei

*2 = Er2 / Eiᐃ
* = *1 / *2

ᅗ 4 ࡟ࣔࢹࣝ໬ࡋࡓ఍㆟ᐊࡢ෗┿ࢆ♧ࡍࠋࡲࡓᅗ 5 ࡟㸪఍㆟ᐊෆ࡟࠾࠸࡚཯ᑕ⋡ࡢᐇࡇࡇ࡛཯ᑕ⋡ࡢᐇᅗ 6 ཯ᑕ⋡ࢆ⾜ࡗࡓྛ⟠ᡤࢆ♧ࡍࠋࢆ⾜࠺࡟ࡣ㸪㟁Ἴࡢ཯ᑕ⋡ࡢᇶ‽ࣞ࣋ࣝ࡜࡞ࡿ㔠ᒓᯈࡢ཯ᑕ⋡ࢆᐃ࡟࠾ࡅࡿᇶ‽࡞࠾㸪*1 ,*2 ࡣࡑࢀࡒࢀධᑕἼࡢ㟁⏺ Ei ࠾ࡼࡧ཯ᑕἼࡢᐃࡍࡿᚲせࡀ࠶ࡿࠋ㟁⏺ Er1 ࡢẚ࡜ࡋ࡚㸪*1 = Er1 /Ei ࡜ࡋ࡚ᐃ⩏ࡉࢀ㸪ྠᵝࡍ࡞ࢃࡕ㸪ᅗ 6 ࡟♧ࡍࡼ࠺࡟ቨ㠃࡟㟁Ἴࡀධᑕࡋࡓ᫬ࡢ

࡟㸪*2 = Er2 /Ei ࡜࡞ࡿࠋᅗ 7 ࡟఍㆟ᐊෆ࡟࠾ࡅࡿ཯ᑕ⋡཯ᑕ⋡*1 ࢆࡢᐃࡍࡿ࡜ྠ᫬࡟㸪ቨ㠃ࡢ⾲㠃ࢆ㔠ᒓᯈ࡜ࡋࡓሙྜࡢ཯ᑕ⋡*2 ࢆᐃࡋࡓୖ࡛㸪୧⪅ࡢẚࢆ࡜ࡾ㸪ᐃࡢᵝᏊࢆ♧ࡍࠋᐃ࡟౑⏝ࡋࡓ㔠ᒓᯈࡣ 400mm

400mm ࡢ࢔࣑ࣝࢩ࣮ࢺ࡛࠶ࡾ㸪ཌࡳࡣ 0.3mm ࡛࠶ࡿࠋ᭱⤊ⓗ࡟཯ᑕ⋡ * = *1 /*2 ࡜ࡋ࡚ᚓࡽࢀࡿࠋ

࡞࠾ᅗ 5 ࡟♧ࡋࡓࡇࡇ࡛㸪㔠ᒓᯈ࡟ࡣᑟ㟁⋡ࡢ㧗࠸࢔࣑ࣝࢽ࣒࢘ᯈࡸ

ᐃ⟠ᡤࡢ୰࡛᳜᱂࡟ࡘ࠸࡚ࡣ㔠ᒓᯈࡢタ⨨ࡀᅔ㞴࡜࡞ࡿࡓࡵ㸪௚ࡢ㖡ᯈࡀ⏝࠸ࡽࢀ㸪ཌࡉࡣ༑ศ࡟ⷧࡃ࡚ࡶ⌮᝿ⓗ࡞཯ᑕ㞳ࡢ㔠ᒓᯈࡢ཯ᑕ⋡ࡢᐃ⟠ᡤ࡟࠾ࡅࡿྠ㊥ᐃ್ࢆ௦⏝ࡋࡓࠋ

㠃࡜ࡋ࡚స⏝ࡍࡿࡀ㸪཯ᑕࡋࡓ㟁Ἴ࢚ࢿࣝࢠ࣮ࡣ࢔ࣥ
ࢸࢼ࠿ࡽቨ㠃ࡲ࡛ࡢ ᚟㊥㞳࡟࠾࠸࡚ⴭࡋࡃῶ⾶ࡍࡿࡓࡵ㸪୧⪅ࡢ

ᐃࡣྠࡌ㊥㞳ࢆಖࡗ࡚⾜࠺ᚲせࡀ࠶ࡿࠋ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ᅗ 7 ఍㆟ᐊෆ࡟࠾ࡅࡿ཯ᑕ

ᐃࡢᵝᏊ ఏ㏦⥺㊰⌮ㄽ࡟ᇶ࡙ࡃ➼౯ⓗ࡞ㄏ㟁⋡ࡢ⟬ฟ཯ᑕ⋡*ࢆㄏ㟁⋡H࡟⨨ࡁ᥮࠼ࡿࡓࡵ࡟ࡣ㸪ఏ㏦⥺㊰⌮ㄽ࡟ࡼࡿ཯ᑕ⋡ィ⟬ᘧ࡟ᇶ࡙ࡁ㏫⟬ࢆ⾜࠺ᚲせࡀ࠶
ࡿࠋᅗ 8 ࡟♧ࡍࡼ࠺࡟ఏ㏦⥺㊰⌮ㄽࡢィ⟬ࣔࢹࣝࡣ㸪ᅗ 4 ࢩ࣑࣮ࣗࣞࢩࣙࣥࣔࢹࣝ࡜ࡋࡓ఍㆟ᐊ(a)㟁Ἴࡀධᑕࡍࡿᮦᩱࡀ↓㝈ࡢཌࡉ࡛࠶ࡿ஦ࢆ௬ᐃࡋ
ࡓሙྜ㸪(b) ᮦᩱࡀ᭷㝈ࡢཌࡉ࡛࠶ࡾཌࡳ d ࢆ᭷ࡍࡿሙ
ྜ㸪(c)␗࡞ࡿㄏ㟁⋡ࡢᮦᩱࡀ✚ᒙࡉࢀ࡚࠸ࡿሙྜࡢ 3䡹䡽䡬䢕〇䢀䢚䡭ࡘࡀ⪃࠼ࡽࢀࡿࠋ䡲䢚䢓䡹䢆䢛䡬䡿䡤䡸䡪䢙ᅗ 9 ࡟ᅗ 8 ࡢࣔࢹࣝࢆゎࡃࡓࡵࡢ➼౯ᅇ㊰ࢆ♧ࡍࠋᅗ䡸䡹䡿䢍ኳ஭䠄ᒾ⥥྾㡢ᯈ䠅

9(a)ࡢሙྜ㸪ධᑕഃࡢ✵㛫㡿ᇦ㸦Section 1㸧ཬࡧᮦᩱࡢ
㡿ᇦ㸦Section 2㸧࡟࠾ࡅࡿἼື࢖ࣥࣆ࣮ࢲࣥࢫ㸦㟁⏺࡜☢⏺ࡢẚ㸧ࡣ㸪ࡑࢀࡒࢀ Z0㸦=376. 7Ȑ㸧㸪Z0 /ξߝ௥ ࡜࡞ࡿࠋࡇࡢ࡜ࡁ㸪཯ᑕ⋡ࡣୗᘧ࡛୚࠼ࡽࢀ㸪ࡇࡢᘧࡼࡾ
ẚㄏ㟁⋡ߝ௥ ࢆᑟฟ࡛ࡁࡿࠋ࡞࠾㸪ẚㄏ㟁⋡ߝ௥ ࡣ✵Ẽ୰ࡢㄏ㟁⋡ߝ଴ ࡜ࡢẚ࡛ᐃ⩏ࡉࢀࡿ್࡛࠶ࡿࠋ
ொჾ᳜᱂▼⭯䢊䢚䡬䢀䢚ቨ䡼䡮䢕䡲䡬䢉䢛䡫䢀ᅗ 5 ఍㆟ᐊෆ࡟࠾ࡅࡿ཯ᑕ㔞ࡢᐇ

|*|⟠ᡤ

69

Z0 / H r  Z0
Z0 / H r  Z0

1 Hr
1 Hr

? Hr

1 | * | 2
1 | * | 2

東急建設技術研究所報 No.40

 ᐊᙧ≧ࡢࣔࢹࣝ໬

ᅗ 8(b)ཬࡧ(c)ࢆゎࡃࣔࢹࣝࡣ㸪ᅗ 9(b)࡟♧ࡍࡼ࠺࡟⫼㠃ࡢ✵㛫㡿ᇦࡢ࢖ࣥࣆ࣮ࢲࣥࢫࢆඛ࡟⪃࠼㸪↓㝈࡟⥆

ᅗ 10 ࡟཯ᑕ⋡ࡢᐇࡃ⫼㠃ࡢ✵㛫ࢆ Z0 ࡢ㈇Ⲵ࢖ࣥࣆ࣮ࢲࣥࢫ࡜ぢ࡞ࡍࠋࡑࣔࢹࣝࢆ♧ࡍࠋᅗ୰࡟཯ᑕ⋡ࡢᐇࡋ࡚㸪ᮦᩱࡢ㡿ᇦ㸦Section 2㸧ࡢ๓㠃࠿ࡽぢࡓධຊ࢖ࣥ

ࡉ 0.15m ࡢ఩⨨࡟࿘Ἴᩘ 2.45GHz ࡢἼ※ࢆタᐃࡋࡓ᫬ࡁ㸪(a)࡜ྠᵝ࡟⪃࠼ࡿࡇ࡜ࡀ࡛ࡁࡿࠋࡢࢹࢫࢡୖ㸦㧗ࡉ 0.7m㸧ࡢ㟁Ἴᙉᗘศᕸࡢࢩ࣑࣮ࣗࣞ

್ࡼࡾㄏ㟁⋡ߝ௥ ࢆồࡵࡿሙྜ㸪ࢩࣙࣥ⤖ᯝࢆᅗ 11 ࡟♧ࡍࠋࡇࡢ⤖ᯝࡼࡾ㸪ᨺᑕࡉࢀࡓᐇ㝿ࡢቨෆ㒊ࡢᮦ㉁ࢆ඲࡚ᆒ୍࡞ᮦᩱ࡜௬ᐃࡍࡿࡇ࡜

㟁Ἴࡣ࿘ᅖ࠿ࡽࡢ཯ᑕἼ࡜ᖸ΅ࡍࡿࡇ࡜࡛㸪㟁Ἴࡢᗈ୍࡛ࡘࡢㄏ㟁⋡࡟⨨ࡁ᥮࠼࡚࠸ࡿࠋࡍ࡞ࢃࡕ㸪཯ᑕ⋡ࡢᐇࡀࡾࡀᆒ୍㸦ྠᚰ෇≧㸧࡛ࡣ࡞ࡃ㸪ᙉᙅࡀධࡾΰࡌࡗ

್࡜ࢩ࣑࣮ࣗࣞࢩࣙࣥୖࡢ཯ᑕ⋡ࡀྠࡌ࡟࡞ࡿ

ࡓศᕸ࡟࡞ࡿࡇ࡜ࡀศ࠿ࡾ㸪཯ᑕ⋡ࡀࢩ࣑࣮ࣗࣞࢩࣙࡼ࠺࡟ᐃ⩏ࡋࡓ➼౯ⓗ࡞ㄏ㟁⋡࡛࠶ࡿࠋࡲࡓ㸪ཝᐦ࡟ࣥ࡟཯ᫎࡉࢀ࡚࠸ࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡿࠋ

ࡣ཯ᑕ⋡ࡣ㸪఩┦᝟ሗࡲ࡛ྵࡴ」⣲཯ᑕ⋡࡜ࡋ࡚ᢅ࠺ᚲせࡀ࠶ࡿࡀ㸪ᮏሗ࡛ࡣࡉ㸧ࡢࡳᐇ್ࡶేࡏ࡚♧ࡋ࡚࠸ࡿࠋ୍౛࡜ࡋ࡚㸪ࣔࢹࣝ୰ࡢࢹࢫࢡ㸦ྑഃ㸧࠿ࡽ㧗ࣆ࣮ࢲࣥࢫ Zin ࢆồࡵࢀࡤቃ⏺ࢆ୍ࡘᾘཤࡍࡿࡇ࡜ࡀ࡛࡞࠾㸪཯ᑕ⋡ࡢᐇ㠃࡛ᵓᡂࡋࡓࢩ࣑࣮ࣗࣞࢩࣙࣥ࡞࠾㸪༢఩ dBm ࡣ 1mW㸦࣑ࣜ࣡ࢵࢺ㸧ࢆ 0dBm ࡜ࡋᐃࡢ౽ᐅୖ㸪⤯ᑐ್㸦኱ࡁ࡚ᐃ⩏ࡉࢀࡿ㟁ຊ್ࡢ༢఩࡛࠶ࡿࠋࡇࡇ࡛ࡣ㸪㏦ཷಙࢆ⾜ࡗ࡚࠸ࡿࠋ࢔ࣥࢸࢼ࡜ࡋ࡚⌮᝿ⓗ࡞༙Ἴ㛗ࢲ࢖࣏࣮ࣝ࢔ࣥࢸࢼࢆ⏝࠸㸪㏦ಙ㟁ຊࢆ 0dBm ࡜ࡋ࡚࠸ࡿࠋࡲࡓ㸪ࣞ࢖ࢺ࣮ࣞࢫἲࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ᮲௳࡜ࡋ࡚ࡣ㸪୍౛࡜ࡋ࡚㸪

Hr཯ᑕࢆ⧞ࡾ㏉ࡍୖ㝈ᅇᩘࢆ 3 ᅇ࡜タᐃࡋ࡚࠸ࡿࠋ(a) ↓㝈㛗ᮦᩱ㸦௬ᐃ㸧d2

d* = 0.31

d1

Wave source (@ 2.45GHz)* = 0.45

HrH r2* = 0.26

H r1* = 0.16(b) ᭷㝈㛗ᮦᩱ 

0.15m

0.15m
3.6m

* = 0.92

  (c) ✚ᒙᮦᩱ
ᅗ 10 ཯ᑕ㸭㏱㐣㠃࡛ᵓᡂࡋࡓゎᯒࣔࢹࣝᅗ 8 ఏ㏦⥺㊰⌮ㄽ࡟࠾ࡅࡿ཯ᑕࣔࢹࣝ

Section 1* = 0.47

Section 2
Section 1

Z 0 # 376.6 [:]Z0 /HrZ0(a) ↓㝈㛗ᮦᩱ
Section 1
STEP 1

Section 2(Z LZLZ0 /Hr )dSection 3ᾕᾸᾴΆᾳ ῂῃ῁ᾴ᾽ᾶῃᾷ ᵹᾳᾑᾼᵻdSection 2Z0Z0 /HrZ0Zin

Z0 /Hrᅗ 11 ᅗ 10 ࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ㸦㧗ࡉ 0.7m㸧
Z0 ᐇ࡜ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢᩚྜᛶ᳨ド ᐇ
Section 1
STEP 2

ᴫせSection 2 + 3ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࡢጇᙜᛶࢆ᳨ドࡍࡿࡓࡵ࡟㸪
Section 1Z0-ᾅ὿ -ᾄᾄ -ᾄ὿ -ᾃᾄ -ᾃ὿ -ᾂᾄ -ᾂ὿ -ᾁᾄ -ᾁ὿

Zin

Z0Z in㟁Ἴᙉᗘศᕸࡢᐇ

ࢆ⾜ࡗࡓࠋ㒊ᒇ඲యࡢศᕸࢆ⊃ࣆࢵࢳ࡟ྲྀᚓࡍࡿ࡜

ᐃⅬᩘࡀ⭾኱࡜࡞ࡾ㸪ᐇ⮬యࡀᅔ㞴࡜࡞ࡿࡓࡵ㸪୍౛࡜ࡋ࡚ᅗ 12 ࡟♧ࡍࡼ࠺࡞ 2 ᮏࡢᐇ(b) ᭷㝈㛗ᮦᩱ࠾ࡼࡧ✚ᒙᮦᩱࣛ࢖ࣥ(L1, L2)ࢆタᐃࡋࡓࠋL1 ཬࡧ L2 ࡢ㊥㞳 2.4m

࡟ᑐࡋ࡚ 50mm 㛫㝸࡛ྛ 49 Ⅼࡢᐇᅗ 9 ᅗ 8 ࡢ➼౯ᅇ㊰࡟࠾ࡅࡿᐇ

70್ࢆྲྀᚓࡋࡓࠋࢆ⾜࠸㸪ྜィ 98 Ⅼ

東急建設技術研究所報 No.40

0Tx.

3.6m
L12.4mL2Rx.

Received power [dBm]Ȣ/2 antenna

2.4mSimulated (1st reflection)
Measured
Theoretical attenuationin free-space-10-20-30-40-50-60-70

Ȣ/2 antenna(a) 1 ᅇ཯ᑕ-800ᅗ 12 ཷಙ㟁ຊศᕸࡢᐇᵝᏊ⤖ᯝ࡜ేࡏ࡚㸪཯

ᑕ 1 ᅇࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝཬࡧ⮬⏤✵㛫࡟࠾ࡅࡿῶ⾶࣮࢝ࣈࡢ⌮ㄽ್ࢆ♧ࡍࠋྠᅗ(b)ࡣᐇ

⤖ᯝ࡜ేࡏ࡚㸪཯ᑕ 3 ᅇࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࢆ♧ࡋ࡚࠸ࡿࠋࡇࡢ⤖ᯝࡼࡾ㸪(a)࡟࠾ࡅࡿῶ⾶࣮࢝ࣈࡣࣞ࣋ࣝࡀ༢ㄪ࡟ῶᑡ
ࡍࡿࡢ࡟ᑐࡋ࡚㸪ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ࠾ࡼࡧᐇ

⤖-20-40-50-60(b) 3 ᅇ཯ᑕ-80

್࡟㏆࠸⤖ᯝ

00.4

ࡀᚓࡽࢀ࡚࠸ࡿࠋࡲࡓ㸪ᅗ 14(a), (b)࡛ࡣ㸪㊥㞳࡟ᑐࡍ

22.4

⤖ᯝ

0

Received power [dBm]ࡢㄗᕪࡀ⪃࠼ࡽࢀࡿࠋ࡞࠾㸪ᐇ್ࢆᇶ‽࡜ࡋࡓ 3 ᅇ཯ᑕ᫬ࡢࢩ࣑࣮ࣗࣞࢩ್ࣙࣥࡢᖹᆒ೫ᕪ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

-20-30-40-50-60ࢺࣃࢯࢥࣥ࡟⿦╔ࡋ࡚ཷಙࢆ⾜ࡗࡓሙྜࡢཷಙ㟁ຊ

-70

ᐃࢆ⾜ࡗࡓࠋ-80ᐃ ࡟ ࡣ ᑓ ⏝ ࢯ ࣇ ࢺ ࢘ ࢙ ࢔ AirMagnet

Ver.3.2 ࢆ⏝࠸㸪L1 ࠾ࡼࡧ L2 ୖ࡟࠾࠸࡚ 0.6m 㛫㝸࡛ྛᐃࡋࡓࠋᅗ 16 ࡟00.4

1.2

1.6

2

2.4

0
Simulated (3rd reflection)
Measured-10

Received power [dBm]ࡇ࡜ࡀ☜ㄆ࡛ࡁ㸪↓⥺ LAN ࢔ࢡࢭࢫ࣏࢖ࣥࢺ࿘ᅖࡢ㟁࡛ࡁࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡿࠋ ࡲ࡜ࡵᮏሗ࡛ࡣ㸪ᗄఱගᏛ㏆ఝࢆ⏝࠸ࡓ㟁Ἴ⎔ቃࡢண

0.8[m]
Position on Line2 [M]್࡜ࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࡣᩚྜࡍࡿ

ᡭἲ࡜ࡋ࡚㸪ᐊෆ࡟࠾ࡅࡿ㟁Ἴࡢ཯ᑕ㸭㏱㐣≉ᛶ࡟╔┠-20-30-40-50-60ࡋࡓࣔࢹࣝ໬ᡭἲࢆᥦ᱌ࡋ㸪ࡑࡢጇᙜᛶࡢ᳨ドࢆᢏ⾡

-70◊✲ᡤෆࡢ఍㆟ᐊ࡛⾜ࡗࡓࠋ⤖ᯝ࡜ࡋ࡚㸪ᐇ-80್ࢆᇶ(b) 3 ᅇ཯ᑕ0‽࡜ࡋࡓࢩ࣑࣮ࣗࣞࢩࣙࣥࡢᖹᆒ೫ᕪ 6.06dB ࡢ⢭ᗘࡀᚓࡽࢀ㸪཯ᑕ⋡ࡢᐇ(a) 1 ᅇ཯ᑕᐃ⤖ᯝ࡜཯ᑕ 3 ᅇࡢࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝࢆేࡏ࡚♧ࡍࠋࡇࡢ⤖ᯝࡼࡾ㸪L1 ࠾ࡼἼ⎔ቃࢆ㐺ษ࡟ண

Simulated (1st reflection)
Measured
Theoretical attenuationin free-space-10࢔ࣥࢸࢼ࡜ᐇ㝿ࡢ༙Ἴ㛗ࢲ࢖࣏࣮ࣝ࢔ࣥࢸࢼࡢ≉ᛶୖࡧ L2 ࡜ࡶ࡟ᐇ1.6

ᅗ 13 L1 ࡟࠾ࡅࡿࢩ࣑࣮ࣗࣞࢩࣙࣥཬࡧᐇ఩⨨ࡢ⢭ᗘ࡟㉳ᅉࡍࡿㄗᕪ㸪ղゎᯒୖࡢ⌮᝿ⓗ࡞

5 Ⅼࢆ

1.2್࡜ࡢ㛫࡟኱ࡁ࡞ᕪࡀ⏕ࡌ࡚࠸ࡿ㸬ࡇࡢ⌮⏤࡜ࡋ࡚ձ2.45GHz ࡢἼ㛗㸦⣙ 120mm㸧࡟ᑐࡍࡿᐇ

0.8

Position on Line1 [m][M]ࡿኚືࡀ≉࡟኱ࡁࡃ࡞ࡿ఩⨨࡟࠾࠸࡚㸪ࢩ࣑࣮ࣗࣞࢩ
ࣙࣥ⤖ᯝ࡜ᐇ

2.4-30-70ᯝࡣ࿘ᅖࡢ཯ᑕᙳ㡪࡟ࡼࡾ」㞧࡟ኚືࡍࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡿ㸬ࡲࡓ㸪(a)࡟ẚ࡭࡚(b)ࡢ᪉ࡀᐇ

2

Simulated (3rd reflection)
Measured-10࡜ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢẚ㍑

ᅗ 13(a)࡟ L1 ୖ 49 Ⅼ࡟࠾ࡅࡿᐇ

0.8
1.2
1.6
Position on Line1 [m][M]

0Received power [dBm] ᐇࣛ࢖ࣥ࠾ࡼࡧᐇ

0.4

0.4

0.8

1.21.622.4[m]Position on Line2 [M]ࢹ࣮ࢱࢆࣞ࢖ࢺ࣮ࣞࢫἲࢩ࣑ࣗ

ᅗ 14 L2 ࡟࠾ࡅࡿࢩ࣑࣮ࣗࣞࢩࣙࣥཬࡧᐇ࣮ࣞࢩࣙࣥ࡬ධຊࡍࡿࡇ࡜࡛」㞧࡞ᐊෆ㟁Ἴ⎔ቃࢆண

71⤖ᯝ

東急建設技術研究所報 No.40

࡛ࡁࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡓࠋࡼࡾ⢭ᗘࡢ㧗࠸ࢩ࣑࣮ࣗࣞࢩࣙࣥࢆᐇ⌧ࡍࡿ୍ࡘࡢ᪉ἲ࡜ࡋ࡚㸪཯ᑕ㔞ࡢධຊWi-Fi analyzer(AirMagnet Ver.3.2)

Access point 11b/g(WN-AG/A / I-O DATA)

್࡜ࡋ࡚᣺ᖜ㸦኱ࡁࡉ㸧ࡢ᝟ሗࡔࡅ࡛ࡣ࡞ࡃ㸪఩┦᝟ሗࢆຍ࠼ࡿ஦࡛㸪ቨ㠃ෆ㒊ࡢ㕲➽ࡸ LGS ➼ࡢ㔠ᒓ࠿ࡽࡢ཯ᑕἼࢆࡼࡾṇ☜࡟ィ⟬࡛ࡁࡿ࡜⪃࠼ࡽࢀࡿࠋ
௒ᚋ㸪ቨ㠃࠿ࡽࡢ཯ᑕἼࡢ఩┦ࢆ⪃៖ࡋࡓࢩ࣑ࣗࣞ
࣮ࢩࣙࣥࢆ⾜࠼ࡿࡼ࠺࡟ࡍࡿ஦ࡀㄢ㢟࡛࠶ࡿࠋࡲࡓ㸪ࡼࡾṇࡋ࠸ධຊ್ࢆ☜ಖࡍࡿࡓࡵ࡟㸪㟁Ἴᬯᐊࢆ฼⏝ࡋ࡚ྛ✀ᮦᩱࡢ཯ᑕ⋡ᐇ

Wireless LAN adapter(ORiNOCO 11a/b/g 8480-JP)್ࢆᇶ࡟ࢹ࣮ࢱ࣮࣋ࢫ໬ࢆᅗࡾ㸪ྛ✀≀௳࡟ᑐᛂ࡛ࡁࡿゎᯒ⎔ቃࢆᵓ⠏ࡋ࡚࠸ࡁࡓ࠸࡜⪃࠼ࡿࠋ

ᅗ 15 AirMagnet ࡟ࡼࡿཷಙࣞ࣋ࣝࡓ
00
Simulated (3rd reflection)
Measured by AirMagnet Ver.3.2-20-30-40-50-60-20-30-40-50-60-70(a) L1-800Simulated (3rd reflection)
Measured by AirMagnet Ver.3.2-10

Received power [dBm]

Received power [dBm]-10-70ᐃ(b) L2-80
0.4

0.8

1.2

1.6

2

2.4

0

0.4

0.8

ᅗ 16 ཯ᑕ 3 ᅇ᫬࡟࠾ࡅࡿࢩ࣑࣮ࣗࣞࢩࣙࣥ⤖ᯝ࠾ࡼࡧ AirMagnet ィ

1.2

1.6

2

2.4

Position on Line2 [m][M]

Position on Line1 [m][M]್ㅰ ㎡஦ົᡤࣅࣝ࡟࠾ࡅࡿ↓⥺ LAN 㟁Ἴ⎔ቃ ᐃ࡟࠾࠸࡚㸪ࡈ༠ຊࢆ㈷ࡾࡲࡋࡓᙜ♫ࢩࢫࢸ࣒ࢭࣥࢱ࣮㛵ಀྛ఩࡟ឤㅰ⮴ࡋࡲࡍࠋཧ⪃ᩥ⊩1㸧ᑠᐑ ୍බ, ᜨẚ᰿ ె㞝, ௒஭ ဴᮁ,͆ࣞ࢖ࢺ࣮ࣞࢫἲ࡟ࡼࡿከ㔜Ἴఏᦙ㊰࡟࠾ࡅࡿᇶᆅᒁ࢔ࣥࢸࢼ≉ᛶࡢホ౯͇, 㟁Ꮚ᝟ሗ㏻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࠼ࡓ࢜ࣇ࢕ࢫ⎔ቃ࡟࠾ࡅࡿ 2.4/5GHz ᖏ↓⥺ LAN ࢩࢫࢸ࣒ࡢᒇෆఏᦙ≉ᛶ͇, ᫎീ᝟ሗ࣓ࢹ࢕࢔Ꮫ఍ᢏ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࡟࠾ࡅࡿࣞ࢖ࢺ࣮ࣞࢫࢆ⏝࠸ࡓ㟁Ἴఏᦙ≉ᛶࡢゎᯒ͇, 㟁Ꮚ᝟ሗ㏻ಙᏛ఍ᢏ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/TRANSMISSIONBY 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, andsurrounding 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 reflectionand transmission characteristics, was proposed. Next, environment of indoor Wireless LAN was predicted, at a room in Instituteof 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.

72