{"id":6082,"date":"2017-08-30T19:30:24","date_gmt":"2017-08-30T12:30:24","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=6082"},"modified":"2017-10-03T09:30:08","modified_gmt":"2017-10-03T02:30:08","slug":"ang-ten-moi-duoc-che-tao-tu-mang-co-kich-thuoc-nho-hon-nhieu-ang-ten-truyen-thong","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/ang-ten-moi-duoc-che-tao-tu-mang-co-kich-thuoc-nho-hon-nhieu-ang-ten-truyen-thong\/","title":{"rendered":"\u0102ng-ten m\u1edbi \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb m\u00e0ng c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n nhi\u1ec1u \u0103ng-ten truy\u1ec1n th\u1ed1ng"},"content":{"rendered":"

M\u1ed9t nh\u00f3m nghi\u00ean c\u1ee9u do c\u00e1c nh\u00e0 khoa h\u1ecdc t\u1ea1i Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc Northeastern, Hoa K\u1ef3 d\u1eabn \u0111\u1ea7u, \u0111\u00e3 t\u1ea1o ra m\u1ed9t lo\u1ea1i \u0103ng-ten m\u1edbi nh\u1ecf h\u01a1n nhi\u1ec1u so v\u1edbi \u0103ng-ten th\u00f4ng d\u1ee5ng. Trong b\u00e0i b\u00e1o nghi\u00ean c\u1ee9u \u0111\u0103ng tr\u00ean t\u1ea1p ch\u00ed Nature Communications, nh\u00f3m t\u00e1c gi\u1ea3 \u0111\u00e3 m\u00f4 t\u1ea3 v\u1ec1 lo\u1ea1i \u0103ng-ten m\u1edbi \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1eeb m\u00e0ng v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng tri\u1ec3n v\u1ecdng.<\/strong><\/p>\n

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Trong nhi\u1ec1u n\u0103m qua, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 nghi\u00ean c\u1ee9u ch\u1ebf t\u1ea1o \u0103ng-ten c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n, cho ph\u00e9p c\u00e1c k\u1ef9 s\u01b0 s\u1eed d\u1ee5ng \u0111\u1ec3 thi\u1ebft k\u1ebf nhi\u1ec1u thi\u1ebft b\u1ecb nh\u1ecf g\u1ecdn, nh\u01b0ng \u0111\u1ebfn nay, nghi\u00ean c\u1ee9u theo h\u01b0\u1edbng n\u00e0y b\u1ecb c\u1ea3n tr\u1edf b\u1edfi \u0103ng-ten th\u00f4ng th\u01b0\u1eddng c\u1ea7n d\u00e0i \u00edt nh\u1ea5t b\u1eb1ng 1\/10 \u0111\u1ed9 d\u00e0i b\u01b0\u1edbc s\u00f3ng \u0111i\u1ec7n t\u1eeb m\u00e0 \u0103ng-ten nh\u1eadn \u0111\u01b0\u1ee3c – \u0111\u1ed1i v\u1edbi \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng, ngh\u0129a l\u00e0 kho\u1ea3ng v\u00e0i centimet v\u00ec \u0103ng-ten nh\u1eadn s\u00f3ng v\u00f4 tuy\u1ebfn trong ph\u1ea1m vi kho\u1ea3ng 11 – 15cm. Trong nghi\u00ean c\u1ee9u m\u1edbi, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 \u00e1p d\u1ee5ng m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn ho\u00e0n to\u00e0n kh\u00e1c \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\n

\u0102ng-ten m\u1edbi \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o t\u1eeb m\u00e0ng, c\u1ee5 th\u1ec3 l\u00e0 hai m\u00e0ng, m\u1ed7i m\u00e0ng \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb m\u1ed9t v\u1eadt li\u1ec7u kh\u00e1c nhau. \u0110\u1ea7u ti\u00ean l\u00e0 m\u00e0ng \u00e1p t\u1eeb, \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng s\u1eaft, gallium v\u00e0 c\u00e1c l\u1edbp boron, c\u00f3 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i dao \u0111\u1ed9ng c\u01a1 h\u1ecdc th\u00e0nh t\u00edn hi\u1ec7u t\u1eeb. M\u00e0ng c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c ch\u1ebf t\u1eeb c\u00e1c l\u1edbp nh\u00f4m nitrit v\u00e0 l\u00e0 m\u00e0ng \u00e1p \u0111i\u1ec7n, c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i dao \u0111\u1ed9ng c\u01a1 h\u1ecdc th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n. Khi t\u00edn hi\u1ec7u \u0111i\u1ec7n t\u1eeb t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn m\u00e0ng th\u1ee9 nh\u1ea5t, n\u00f3 g\u00e2y ra c\u00e1c dao \u0111\u1ed9ng, d\u1eabn \u0111\u1ebfn t\u1ea1o th\u00e0nh t\u00edn hi\u1ec7u t\u1eeb t\u00ednh. M\u00e0ng th\u1ee9 hai nh\u1eadn c\u00e1c t\u00edn hi\u1ec7u \u0111\u00f3 v\u00e0 t\u1ea1o ra c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec7n t\u01b0\u01a1ng \u1ee9ng, \u0111\u01b0\u1ee3c truy\u1ec1n \u0111\u1ebfn m\u1ed9t thi\u1ebft b\u1ecb \u0111i\u1ec1u khi\u1ec3n ph\u1ee5c v\u1ee5 m\u1ed9t m\u1ee5c \u0111\u00edch nh\u1ea5t \u0111\u1ecbnh nh\u01b0 x\u00e1c \u0111\u1ecbnh t\u1ecda \u0111\u1ed9 GPS. \u0110\u01b0\u01a1ng nhi\u00ean, \u0103ng-ten c\u0169ng c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng theo chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i \u0111\u1ec3 truy\u1ec1n t\u00edn hi\u1ec7u. V\u00ec kh\u00f4ng b\u1ecb gi\u1edbi h\u1ea1n b\u1edfi k\u00edch th\u01b0\u1edbc c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eeb, n\u00ean \u0103ng-ten m\u1edbi c\u00f3 k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n nhi\u1ec1u \u0103ng-ten truy\u1ec1n th\u1ed1ng, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p nh\u1ecf h\u01a1n \u0111\u1ebfn 100 l\u1ea7n.<\/p>\n

Nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 th\u1eed nghi\u1ec7m phi\u00ean b\u1ea3n \u0103ng-ten m\u1edbi b\u1eb1ng c\u00e1ch l\u1eafp \u0111\u1eb7t v\u00e0o c\u00e1c thi\u1ebft b\u1ecb WiFi, GPS v\u00e0 v\u00f4 tuy\u1ebfn FM v\u00e0 k\u1ebft qu\u1ea3 cho th\u1ea5y ch\u00fang ho\u1ea1t \u0111\u1ed9ng t\u1ed1t nh\u01b0 mong \u0111\u1ee3i. \u0102ng-ten t\u1eeb m\u00e0ng c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho li\u00ean l\u1ea1c \u0111i\u1ec7n tho\u1ea1i. Sau khi \u0103ng-ten \u0111\u01b0\u1ee3c c\u1ea3i ti\u1ebfn cho ch\u1eafc ch\u1eafn h\u01a1n, n\u00f3 s\u1ebd h\u1eefu \u00edch cho nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau, t\u1eeb thi\u1ebft b\u1ecb mang theo ng\u01b0\u1eddi \u0111\u1ebfn c\u00e1c c\u1ea3m bi\u1ebfn y h\u1ecdc c\u1ea5y gh\u00e9p.<\/p>\n

Ngu\u1ed3n T\u1ea1p ch\u00ed Khoa h\u1ecdc v\u00e0 C\u00f4ng ngh\u1ec7 Vi\u1ec7t Nam<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

M\u1ed9t nh\u00f3m nghi\u00ean c\u1ee9u do c\u00e1c nh\u00e0 khoa h\u1ecdc t\u1ea1i Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc Northeastern, Hoa K\u1ef3 d\u1eabn \u0111\u1ea7u, \u0111\u00e3 t\u1ea1o ra m\u1ed9t lo\u1ea1i \u0103ng-ten m\u1edbi nh\u1ecf h\u01a1n nhi\u1ec1u so v\u1edbi \u0103ng-ten th\u00f4ng d\u1ee5ng. Trong b\u00e0i b\u00e1o nghi\u00ean c\u1ee9u \u0111\u0103ng tr\u00ean t\u1ea1p ch\u00ed Nature Communications, nh\u00f3m t\u00e1c gi\u1ea3 \u0111\u00e3 m\u00f4 t\u1ea3 v\u1ec1 lo\u1ea1i \u0103ng-ten m\u1edbi \u0111\u01b0\u1ee3c […]<\/p>\n","protected":false},"author":17,"featured_media":6342,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-6082","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/6082","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=6082"}],"version-history":[{"count":2,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/6082\/revisions"}],"predecessor-version":[{"id":6354,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/6082\/revisions\/6354"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/6342"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=6082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=6082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=6082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}