1293215 九、發明說明： 【發明所屬之技術領域】 ’特別是利用 適合内藏於無 彎折的 線通訊 本發明係為一種雙頻倒F形天線 結構來縮小雙頻倒F形天線的尺寸， 產品中。 【先前技術】 泛，通=蓬Γ展，無線網路的應用越來越廣 之而天線為热線通訊產品中最重要的收發 線的性能影響著無線通訊產品的 併x ，口夂 線通訊產品的雙頻天線皆且有相…前習用於無 告號第_5视“雙2線?寸;台灣專利公 味“夕 又硕天綠及台湾專利公告號第555,177 =夕4天線，，，所揭示—種利用筆記型電腦液晶榮幕所 内建的接地面，在其接地面上設計雙頻天線的例子。若要 將上述的天線内藏於通訊產品中，f要相#大的配置空間 。為解決此—問題’我們提I種創新設計，可縮小天線 尺寸並適合内藏於通訊產品中，且可涵蓋目前無線區域網 路（WLAN ) 2.4 GHz (2.4-2.484 GHz)及 5 GHz(5.15_5 35， 5·725-5·875 GHz)頻帶所須之頻寬需求。 【發明内容】 如上所述，本發明之目的在於提供一種具有彎折結構 的倒F雙頻天線。本發明包括：—接地面，形狀大致為_ 矩形，具有一上方邊緣，而在該接地面之上方邊緣附近具 1293215 :面接地點;一不對似形金屬臂，位於該接 -地面之该上方邊緣附近接 )共振模態及—第m f f μ線之1 —(低頻 屬臂ί/ 端與一末端（開口端），且該第一全 ”形於該接地面之該上方邊緣；-第二金屬臂： 使C 一末端（開口端)並具有至少二次幫折， 1更具末鳊大致以平行於讀 起& 接地面之该上方邊緣，並朝向其 屬；延伸’：時該第二金屬臂之長度長於該第-金 上方邊:又’及一弟二金屬臂，大致垂直於該接地面之該 =，並藉由連接該第—金屬臂之該起始端與該第二 屬該起始端形成該不對稱丁形金屬臂’且該第三金 #已3—饋入，點；一短路金屬臂，形狀大致為一倒L形 ，位於該第二金屬臂與該接地面之間，-端連接至該第三 孟屬臂之該饋入點，另一端連接至該接地面之該短路點， 用=將該T形金屬臂電氣連接至該接地面；及一饋入同軸 、别線，包含：—中心導線，連接至該第三金屬臂之該饋 ^點；及-外層接地導體’連接至該接地面之接地點。同 日守°亥T形金屬臂與該短路金屬臂由-單-金屬片沖壓或切 割製作而成。 在本項設計中，該Τ形金屬臂之該第一金屬臂之長度 t第三金屬臂之長度之和’接近該天線之該第二共振模 /員率之1/4波長，另該τ形金屬臂之該第二金屬臂 之長度與該第三金屬臂之長度之和，接近該天線之該第一 共振模態中心頻率之1/4波長。因此，藉由調整該τ形金 1293215 m!—金屬臂與該第三金屬臂長度之和、該τ形金 屬1之^二金屬臂_第三金屬臂錢之和，可以得到 本發明天線之雙頻握你 、 且本發明天線具有天線縮小化的 優點，適合内藏於In 、“、、線通汛產品中，達成雙頻操作之通訊 功能。 【實施方式】 J考第1圖’為一般習知應用在無線區域網路之雙頻 倒F形天線一實施例1，白4 .. χ_ 包括·一接地面12，形狀大致為 一矩形’具有一上方邊緣⑵·，-不對稱τ形金屬臂13， 位於該接地面之該上方邊緣121附近，用於產生該天線之 -低頻及-高頻模態；—短路金屬臂17，形狀大致為一倒 L形，用以將該Τ形金屬臂13電氣連接至該接地面12。在 本實施例中，該倒F形天線i具有相當大的尺寸，若要將 該倒F形天線1内藏於通訊產品中，需要相當大的配置空 間，為解決此一問題’我們在實施例2提出一種創新設計 ，可達成天線縮小化，並具有良好的雙頻操作頻寬。 參考第2圖，本發明之雙頻倒F形天線一實施例2， 包括：一接地面12，形狀大致為一矩形，具有一上方邊緣 121 ，而在該接地面之上方邊緣121附近具有一短路點 122與一接地點123 ; —不對稱T形金屬臂13，位於該接 地面之該上方邊緣121附近，用於產生該天線之一第（低 頻）共振模態31及一第二（高頻）共振模態32，其包含： 一第一金屬臂14，具有一起始端141及一末端142，且該 1293215 ·· f 一金屬臂14大致平行於該接地面之該上方邊緣121 ;一 ‘第了金屬臂25，具有一起始端251與一末端252 (開口端 亚具有至少二次彎折，使其末端252大致以平行於該接 地面之該上方邊、緣121，並朝向其起始端251 $向延伸， 同時，第二金屬臂25之長度長於該第一金屬臂14之長度； 及第二金屬臂16，大致垂直於該接地面之該上方邊緣 ^21 ’並藉由連接該第一金屬臂之該起始端141與該第二 =屬臂之該起始端251形成該不對稱τ形金屬臂丨），且該 籲少至屬I Μ包含一饋入點161 ; —短路金屬臂17，形狀 大致為一倒L形，位於該第二金屬臂25與該接地面12之間 立而連接至該第三金屬臂之該饋入點161 ，另一端連接 至忒接地面之該短路點122 ，用以將該丁形金屬臂13電氣 連接至該接地面12 ;及一饋入同軸傳輸線18，包含··一中 &線181 ，連接至該第三金屬臂之饋入點161 ;及一外 層接地導體182，連接至該接地面之接地點123。在本實 施例2 該Τ形金屬臂13與該短路金屬臂17由一單一金 屬片沖壓或切割製作而成，且本發明天線具有天線縮小化 的優點，適合内藏於無線通訊產品中，達成雙頻操作之通 訊功能。 第3圖為本發明天線一實施例2的返回摄失量測結果 ，在貫施例2中，為考慮筆記型電腦液晶螢幕内建之接地 面裱境，我們選擇接地面12之長度约為26〇_、寬度約為 200 mm，该第一金屬臂14之長度約為8 mm、寬度約為1 mm ’ σ亥苐一金屬臂25之長度約為31 mm、寬度約為1 1293215 •腿_ ;該第三金屬臂16之長度約為4mm、寬度約為“； -该短路金屬臂17之長度約為17麵、寬度約為lmm。由所 Ϊ貫驗、ΐ果、，，在返回損失小於祕❸定義下，該操作頻 見可涵盖目前無線區域網路（WLAN ) 2.4 GHz (2.44484 GHz)及 5 GHz (5.15-5.35, 5.725-5.875 GHz)頻帶所須之頻寬需求 0 弟4圖為本發明之第一其他實施例4，該第一金屬臂 」〃有夂弓折，且其末端442大致以平行於該接地面之 孩士方邊緣121 ，並朝向遠離該接地面12之方向延伸，使 -亥第金屬臂44大致形成—L形，其目的在於縮小天線的 ，並，少天線整體所佔用的空間。第5圖為本發明之 ^ 〃他員施例5，該第一金屬臂54經二次彎折，且其末 而542大致以平行於該接地面之該上方邊緣I。，並朝向 其起始端541方向延伸，使該第—金屬f54大致形成1 形山同日守该第一金屬臂之起始端541與該第二金屬臂之起 始知251連接至該第三金屬臂16上的位置不同。第一及第 一其他Λ施例均可以獲得如本發明之一實施例（第2圖結 構）相似的操作特性。 以上5兒明中所述之實施例僅為說明本發明之原理及功 f，而非限制本發明。目A，習於此技術之人士可在不違 月本舍明之精神對上述實施例進行修改及變化。本發明之 權利In圍如後述之巾請專利範圍所列。 1293215 【圖式簡單說明】 • · 第1圖為習知倒F形天線一實施例結構圖。 第2圖為本發明天線一實施例結構圖。 第3圖為本發明天線一實施例之返回損失實驗量測結果 〇 第4圖為本發明天線之第一其他實施例結構圖。 第5圖為本發明天線之第二其他實施例結構圖。1293215 IX. Description of the invention: [Technical field to which the invention pertains] 'In particular, the use of a line communication suitable for being embedded in a bendless invention is a dual-frequency inverted-F antenna structure to reduce the size of a dual-frequency inverted-F antenna. In the product. [Prior Art] The application of wireless networks is becoming more and more widespread, and the performance of the most important transmission and reception lines in the hotline communication products affects the wireless communication products. The dual-frequency antennas of the products are all related to each other. Formerly used for no-signal number _5" "double 2 line? inch; Taiwan patent public taste" 夕 硕 天 绿 green and Taiwan patent notice number 555, 177 = eve 4 antenna, , an example of using a built-in ground plane of a notebook computer LCD screen to design a dual-frequency antenna on its ground plane. To embed the above antenna in a communication product, f has to be configured with a large space. To solve this problem, we propose an innovative design that reduces the size of the antenna and is suitable for inclusion in communication products, and covers the current wireless local area network (WLAN) 2.4 GHz (2.4-2.484 GHz) and 5 GHz (5.15). _5 35, 5·725-5·875 GHz) Bandwidth requirements for the band. SUMMARY OF THE INVENTION As described above, it is an object of the present invention to provide an inverted-F dual-frequency antenna having a bent structure. The invention comprises: a ground plane having a shape of substantially _ rectangle having an upper edge and having a 1293215: surface ground point near the upper edge of the ground plane; and a misaligned metal arm located at the upper edge of the ground-ground Resonance mode nearby and - 1st of the mff μ line - (low frequency is arm ί / end and one end (open end), and the first full" is formed on the upper edge of the ground plane; - second metal Arm: Make C one end (open end) and have at least two folds, 1 more end 鳊 roughly parallel to the upper edge of the read & grounding surface, and towards its genus; extending ': when the second The length of the metal arm is longer than the upper side of the first-gold: another 'and one of the two metal arms, substantially perpendicular to the grounding surface=, and by connecting the starting end of the first metal arm with the second genus The starting end forms the asymmetric butt-shaped metal arm 'and the third gold #3 has been fed-in, a point; a short-circuited metal arm having a substantially inverted L shape between the second metal arm and the ground plane , the end is connected to the feed point of the third Meng arm, and the other end is connected to The short-circuit point of the ground plane, electrically connecting the T-shaped metal arm to the ground plane; and feeding a coaxial, other line, comprising: a center wire connected to the feed point of the third metal arm; And the outer grounding conductor 'connects to the grounding point of the grounding surface. The same day, the T-shaped metal arm and the short-circuited metal arm are stamped or cut from a single-metal sheet. In this design, the shape The length of the first metal arm of the metal arm t is the sum of the lengths of the third metal arms 'close to the 1/4 wavelength of the second resonant mode/rate of the antenna, and the second metal arm of the τ-shaped metal arm The length of the sum of the length of the third metal arm is close to a quarter wavelength of the first resonant mode center frequency of the antenna. Therefore, by adjusting the τ-shaped gold 1293215 m! - the metal arm and the third The sum of the lengths of the metal arms, the sum of the two metal arms of the τ-shaped metal 1 and the third metal arm, can obtain the dual-frequency grip of the antenna of the present invention, and the antenna of the present invention has the advantage of narrowing the antenna, and is suitable for the built-in In the In, ",, line of communication products, to achieve dual-frequency operation of communication functions [Embodiment] J. Figure 1 is a conventional dual-frequency inverted-F antenna used in a wireless local area network. Embodiment 1 is white. 4. χ_ includes a ground plane 12 having a substantially rectangular shape. An upper edge (2)·,-asymmetric τ-shaped metal arm 13 is located near the upper edge 121 of the ground plane for generating a low-frequency and high-frequency mode of the antenna; and short-circuiting the metal arm 17 having a shape substantially An inverted L shape for electrically connecting the dome-shaped metal arm 13 to the ground plane 12. In the embodiment, the inverted-F antenna i has a considerable size, and the inverted-F antenna 1 is built in. In the communication products, a considerable configuration space is required. To solve this problem, we propose an innovative design in Embodiment 2, which can achieve antenna reduction and have a good dual-frequency operation bandwidth. Referring to FIG. 2, a second embodiment of the dual-frequency inverted-F antenna of the present invention includes: a ground plane 12 having a substantially rectangular shape with an upper edge 121 and a vicinity of the upper edge 121 of the ground plane. a short circuit point 122 and a grounding point 123; an asymmetric T-shaped metal arm 13 located near the upper edge 121 of the ground plane for generating a (low frequency) resonant mode 31 and a second (high) of the antenna a resonant mode 32, comprising: a first metal arm 14 having a starting end 141 and an end 142, and the 1293215··f metal arm 14 is substantially parallel to the upper edge 121 of the ground plane; The first metal arm 25 has a starting end 251 and a distal end 252 (the open end has at least two bends such that its end 252 is substantially parallel to the upper edge of the ground plane, the edge 121, and toward its starting end 251 The length of the second metal arm 25 is longer than the length of the first metal arm 14; and the second metal arm 16 is substantially perpendicular to the upper edge ^21' of the ground plane and is connected by the first The starting end 141 of the metal arm and the second The starting end 251 of the genus arm forms the asymmetric θ-shaped metal arm 丨), and the refusal to the genus I Μ includes a feeding point 161; the short-circuiting metal arm 17 is substantially in the shape of an inverted L, located at the The second metal arm 25 is connected to the grounding surface 12 to the feeding point 161 of the third metal arm, and the other end is connected to the short-circuit point 122 of the grounding surface for the butt-shaped metal arm 13 Electrically connected to the ground plane 12; and a feed-in coaxial transmission line 18, including a middle & line 181, connected to the feed point 161 of the third metal arm; and an outer ground conductor 182 connected to the connection Ground point 123 on the ground. In the second embodiment, the 金属-shaped metal arm 13 and the short-circuited metal arm 17 are stamped or cut from a single metal piece, and the antenna of the invention has the advantages of antenna reduction, and is suitable for being embedded in a wireless communication product. Communication function for dual-frequency operation. Figure 3 is a return loss measurement result of the antenna of the second embodiment of the present invention. In the second embodiment, in order to consider the grounding environment of the built-in LCD screen of the notebook computer, we select the length of the ground plane 12 to be approximately 26〇_, width is about 200 mm, the length of the first metal arm 14 is about 8 mm, and the width is about 1 mm. The length of the metal arm 25 is about 31 mm and the width is about 1 1293215. The length of the third metal arm 16 is about 4 mm and the width is about "; - the length of the short-circuited metal arm 17 is about 17 faces and the width is about 1 mm. The test is carried out by the test, the result, and the return. The loss is less than the definition of the secret, which can cover the bandwidth requirements of the current wireless local area network (WLAN) 2.4 GHz (2.44484 GHz) and 5 GHz (5.15-5.35, 5.725-5.875 GHz) bands. The first other embodiment 4 of the present invention is characterized in that the first metal arm has a meandering bow and its end 442 is substantially parallel to the side edge 121 of the grounding surface and faces away from the grounding surface 12. The direction is extended so that the -Medi metal arm 44 is substantially formed into an L-shape, the purpose of which is to reduce the antenna, and less antenna The space occupied by the body. Fig. 5 is a fifth embodiment of the present invention. The first metal arm 54 is bent twice, and finally 542 is substantially parallel to the upper edge I of the ground plane. And extending toward the starting end 541 thereof, so that the first metal f54 is substantially formed into a 1-shaped mountain, the starting end 541 of the first metal arm and the starting end 251 of the second metal arm are connected to the third metal arm 16 The location is different. Both the first and first other embodiments can achieve similar operational characteristics as one embodiment of the present invention (structure of Fig. 2). The embodiments described above are merely illustrative of the principles and advantages of the invention and are not intended to limit the invention. A person skilled in the art may modify and change the above embodiments without departing from the spirit of the moon. The right of the present invention is as set forth in the scope of the patent application as described later. 1293215 [Simple description of the drawings] • Fig. 1 is a structural diagram of an embodiment of a conventional inverted-F antenna. Fig. 2 is a structural view showing an embodiment of an antenna according to the present invention. Fig. 3 is a diagram showing the results of the experimental measurement of the return loss of an antenna according to an embodiment of the present invention. Fig. 4 is a structural view showing the first embodiment of the antenna of the present invention. Fig. 5 is a structural view showing a second embodiment of the antenna of the present invention.
【主要元件符號說明】 1 •習知倒F形天線 12 :接地面或筆記型電腦液晶螢幕（LCD)之支撐金屬 背板 121 ··接地面之一上方邊緣 122 :短路點 123 ··接地點 13 :不對稱T形金屬臂 14 :第一金屬臂 141 :第一金屬臂之起始端 142 ··第一金屬臂之末端 15 :第二金屬臂 151 :第二金屬臂之起始端 152 :第二金屬臂之末端 16 :第三金屬臂 161 :第三金羼臂 _ ^ ^ 鳊或天線饋入點 1293215 17 ·· 短路金屬臂 • 18 ·· 饋入同轴傳輸線 181 ·· 饋入同軸傳輸線之中心導線 182 ： 饋入同軸傳輸線之外層接地導體 2 本發明天線一實施例 25 第二金屬臂 251 第二金屬臂之起始端 • 252 第二金屬臂之末端 31 :第一共振模態 32 •弟二共振权悲 4 本發明天線之第一其他實施例 44 第一金屬臂 441 第一金屬臂之起始端 • 442 第一金屬臂之末端 5 ••本發明天線之第二其他實施例 54 :第一金屬臂 541 :第一金屬臂之起始端 542 :第一金屬臂之末端 12[Main component symbol description] 1 • Conventional inverted F antenna 12: Ground plane or notebook computer LCD screen support metal back plate 121 · One of the ground planes Upper edge 122: Short circuit point 123 · Ground point 13: asymmetric T-shaped metal arm 14: first metal arm 141: first metal arm starting end 142 · first metal arm end 15: second metal arm 151: second metal arm starting end 152: End of the two metal arms 16: Third metal arm 161: Third metal arm _ ^ ^ 鳊 or antenna feed point 1293215 17 · Short circuit metal arm • 18 · Feeding coaxial transmission line 181 ·· Feeding coaxial transmission line Center conductor 182: Feeding coaxial transmission line outer ground conductor 2 Antenna of an embodiment of the invention 25 Second metal arm 251 Starting end of the second metal arm • 252 End of the second metal arm 31: First resonant mode 32 • Second Resonance Rights 4 The first other embodiment of the antenna of the present invention 44 the first metal arm 441 the starting end of the first metal arm • 442 the end of the first metal arm 5 • The second other embodiment 54 of the antenna of the present invention: the first Genus arm 541: a first end of the metal arm 12: the start end of a first metal arm 542