200803049 / 九、發明說明： 【發明所屬之技術領域】 本發明係為一種雙頻倒F形天線，特別是利用彎折的 結構來縮小雙頻倒F形天線的尺寸，適合内藏於無線通訊 【先前技術】 、隨著無線通訊的蓬勃發展，無線網路的應用越來越廣 泛，而天線為無線通訊產品中最重要的收發元件，因此天 線的性能影響著無線通訊產品的通訊品質乂目前習用於無餳 線通訊產品的雙頻天線皆具有相當大的尺寸；台灣專利公 告號第1237,754號“雙頻天線，，及台灣專利公告號第相，⑺ 旎多頻天、線”，所揭示一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，需要相當大的配置空間 。為解決此-問題’我們提出一種創新設計，可縮小^ 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，春 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—種具有彎折 的倒？雙頻天線。本發明包括：-接地面，形狀大致I 矩形’具有-上方邊緣，而在該接地面之上方邊緣附近具 200803049 ::短路點與-接地點；—不對稱 地面之該上方邊緣㈣， 位=亥接 金屬臂，具有-起;^^ 態，其包含：―第- • ^ t始碥與一末端（開口端）， 使始端與-末端（開口端）並具有至少二次彎折， 使/、末鈿大致以平行於該接地面之 =端方向延伸，同時該第二金屬臂之長丄 :方：長度，及一第三金屬臂’大致垂直於該接地面之該 並藉由連接該第一金屬臂之該起始端與該第二 凰y之該起始端形成該不對稱丁形金屬臂，且該第三金 1包含-饋入點；-短路金屬臂，形狀大致為一倒[形 合2該第二金屬臂與該接地面之間，一端連接至該第^ 、，屬1之該饋人點，另—端連接至該接地面之該短路點，. :金屬Γ氣連接至該接地面；及-饋入同軸 入點;.及一外層接地導:線連==三金屬㈣^ ^ ^ ^ ^ ^ ^ ^連接至該接地面之接地點。同. 繼該短路金屬臂由-單-金屬㈣或切 在本項設計中，該τ形冬星辟> # # 办金屬臂之該第一金屬臂之長度 =第三金屬臂之長度之和’接近該天線之該第二共振模 1心頻率之1/4波長，另該了形金屬臂之該第二金屬臂 :ff與該第三金屬臂之長度之和，接近該天線之該第— ”振模態中心頻率之1/4波長。因此，藉由調整該T形金 200803049 屬臂之該第一金屬臂與該第二 m ββ ^ Α 乐一孟屬#長度之和、該了形金 丄々 牙，、孩弟二金屬臂長度之和，可以得到 本發明天線之雙頻择作， 斤點，$人由贫…、 本务明天線具有天線縮小化的 k…、占 適合内滅於益缓诵今口山 . 士此 …、本通讯產品中，達成雙頻操作之通訊 功能。 【實施方式】 參考第1圖，為一般習知應用在無線區域網路之雙頻 !；=天線一實施例1，包括：一接地面12 ,形狀大致為 广具有一上方邊、緣121，·一不對稱τ形金屬臂^ 位於該接地面之該上方邊緣121附近，驗產生該天線之 厂低頻及—高頻m路金屬臂17，形狀大致為一倒 形’用以將該T形金屬臂13電氣連接至該接地面12。在 ，實施例中’該倒F形天線i具有相當大的尺寸，若要將 -亥倒F形天線1内藏於通訊產品中，需要相當大的配置* 間，為解決此-問題，我們在實施例2提出一種創新設= ’可達成天線縮小化\並异有良好的雙頻操作頻寬。 蒼考第2圖，本發明之雙頻倒F形天線一實施例2， 包括：-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 ; 一不對稱丁形金屬臂^，位於該揍. 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-第二（高頻）共振模g32，其包含. 一第一金屬臂Μ，具有一起始端141及一末端142，且該 200803049 :f 大致平行於料地面㈣上方邊緣⑵；一 ^ -金屬臂25，具有一起始端251與一末端252 (開口端 2亚具有至少二”折’使其末端252大致以平行於該接 _面m方邊緣121，並朝向其起始端251方向延伸， 同7第二金屬臂25之長度長於該第-金屬臂14之長度； 及一弟f ί屬臂16，大致垂直於該接地面之該上方邊緣 121 ，亚猎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13，且該 .第三金屬臂16包含一饋入點⑹;一短路金屬臂17，形狀 大致為一倒L形，位於該第二金屬臂乃與該接地面12之間 ，一端連接至該第三金屬臂之該饋入點161 ，另一端連接 至該接地面之該短路點122，用以將該Τ形金屬臂13電氣 連接至該接地面12 ;及一饋入，同轴傳輸線18，包含：一中 心導線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中，該τ形金屬臂13與該短路金屬臂17由一單一金 .屬片冲壓或切割製作而成，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的返回損失量測結果 ;在實施例2中，為考慮筆記型電腦液晶螢幕内建之接地 面環境，我們選擇接地面12之長度約為260 mm、寬度約為 2〇〇 mm，該第一金屬臂14之長度約為8 mm、寬度約為^ mm ;該第二金屬臂25之長度約為31mm、寬度約為i 200803049 :豆路:ί:金屬臂16之長度約為4_、寬度約為ι_; 得實驗=長1約為17mm、寬度約為lmm。由所 寬可、：i在返回損失小於10dB _定義下，該操作頻 、」叫盍目珂無線區域網路（WLAN ) z4gh GHz) ^ 5 GHz (5.15-5.35, 5.725-5.875 GHz) ^ ^ ^ ^ t ^ 第4圖為本發明之第一其他實施例4，該第一金屬臂 =具有一次彎折，且其末端442大致以平行於該接地面之 罈士方邊緣.121 ，並朝向遠離該接地面12之方向延伸，使 该第-金屬臂44大致形成-L形，其目的在於縮小天線的 ^了，亚減少天線整體所佔用的空間。/第5圖為本發明之 $二其他實施例5，該第一金屬臂54經二次彎折，且其末 端542大致以平行於該接地面之該上方邊緣ι2ι ，並朝向 其起始端541方向延伸，使該第一金屬臂54大致形成一匸 形，同時該第一金屬臂之起始端541輿該第二金屬臂之起 始立而251連接至該第三金屬臂16上的位置不同。第一及第 —其他貫施例均可以獲得如本發明之一實施例（第2圖結着 構）相似的操作特性。 以上說明中所述之實施例僅為說明本發明之原理及功 效，而非限制本發明。因此，習於此技術之人士可在不違 月本^明之精神對上述實施例進行修改及變化。本發明之 權利範圍如後述之申請專利範圍所列。 200803049 • 【圖式簡單說明】 f1圖為f知倒F形天線—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-實施例之返回損失實驗量測結果 第4圖為本發明天嫁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。 【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 I21 ·接地面之一上方邊緣 ，122 :短路點 、·一 123 :接地點 13 :不對稱T形金屬臂 14 ··第一金屬管 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 β第三金屬臂 161 第二金屬臂之一端或天線饋入點 200803049 17 ： 短路金屬臂 18 饋入同軸傳 輸線 181 饋入同轴傳 輸線之中心導 線 182 饋入同軸傳 輸線之外層接 地導 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 :第二共振模 態 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 12200803049 / IX. Description of the Invention: [Technical Field] The present invention is a dual-frequency inverted-F antenna, in particular, using a bent structure to reduce the size of a dual-frequency inverted-F antenna, and is suitable for being embedded in wireless communication. [Prior Art] With the rapid development of wireless communication, wireless networks are more and more widely used, and antennas are the most important transceiver components in wireless communication products. Therefore, the performance of antennas affects the communication quality of wireless communication products. The dual-frequency antennas used in sugar-free line communication products are of considerable size; Taiwan Patent Publication No. 1237,754 "Double-band antennas, and Taiwan Patent Notice No., (7) 旎 multi-frequency days, lines", An example of using a built-in ground plane of a notebook LCD screen to design a dual-frequency antenna on its ground plane is disclosed. To embed the above antenna in a communication product requires a considerable amount of configuration space. To solve this problem, we propose an innovative design that can be reduced in size and suitable for inclusion in communication products, and can cover current wireless local area networks (WLAN) 2.4 GHz (2.4-2.484 GHz) and 5 GHz (5.15- 5.35, spring 5·725-5·875 GHz) bandwidth requirements for the frequency band. SUMMARY OF THE INVENTION As described above, the object of the present invention is to provide a kind of bending with a bend. Dual frequency antenna. The invention comprises: a ground plane having a shape substantially I rectangular 'having an upper edge, and having a 200803049 :: short circuit point and a ground point near the upper edge of the ground plane; - the upper edge of the asymmetric ground (four), bit = The metal arm of the hoist has a state of -2; which includes: - the first - and the end (open end), the beginning and the end (open end) are at least twice bent, so that /, the last 钿 extends substantially in the direction parallel to the end of the ground plane, while the length of the second metal arm: square: length, and a third metal arm 'is substantially perpendicular to the ground plane and is connected by The starting end of the first metal arm and the starting end of the second phoenix y form the asymmetric butt-shaped metal arm, and the third gold 1 includes a feed point; the short-circuited metal arm has a shape substantially inverted [Shaping 2 between the second metal arm and the ground plane, one end is connected to the first, the feed point of the genus 1, and the other end is connected to the short circuit point of the ground plane, . Connected to the ground plane; and - fed into the coaxial entry point; and an outer grounding conductor: line connection == three metal (four) ^ ^ ^ ^ ^ ^ ^ ^ Connect to the ground point of this ground plane. Same as the short-circuited metal arm by - single-metal (four) or cut in the design, the τ-shaped winter star &>## The length of the first metal arm of the metal arm = the length of the third metal arm And the 1/4 wavelength of the second resonant mode 1 of the antenna, and the sum of the length of the second metal arm:ff and the third metal arm of the shaped metal arm, close to the antenna The first - "the center frequency of the mode of the mode is 1/4 wavelength. Therefore, by adjusting the sum of the length of the first metal arm of the T-shaped gold 200803049 arm and the second m ββ ^ 乐 Le Yimeng #, The shape of the gold fangs, the length of the two metal arms of the child, can get the dual-frequency selection of the antenna of the invention, the point of the pound, the cost of the person from the poor... It is suitable for internal combustion and easing. This is the communication function of the dual-frequency operation. [Embodiment] Refer to Figure 1 for the dual-frequency application of wireless local area network. Embodiment 1 of the antenna includes: a ground plane 12 having a shape substantially broadly having an upper edge and an edge 121. A symmetric θ-shaped metal arm is located near the upper edge 121 of the ground plane, and the factory low frequency and high frequency m-way metal arm 17 is formed to be substantially inverted to form the T-shaped metal arm 13 Electrically connected to the ground plane 12. In the embodiment, the inverted-F antenna i has a considerable size, and if the H-shaped inverted antenna 1 is built into the communication product, a considerable configuration is required. In order to solve this problem, we propose an innovative design in Example 2 = 'Achievable antenna reduction\ and a good dual-frequency operation bandwidth. Cang Kao 2, the dual-frequency inverted-F antenna of the present invention An embodiment 2 includes: the ground plane 12' has a substantially rectangular shape with an upper edge 121, and has a short-circuit point 122 and a grounding point 123 near the upper edge 121 of the ground plane; a metal arm ^ located adjacent the upper edge 121 of the ground for generating a (low frequency) resonant mode 31 and a second (high frequency) resonant mode g32 of the antenna, comprising: a first metal The armature has a starting end 141 and an end 142, and the 200803049 :f Roughly parallel to the upper edge (2) of the material floor (4); a metal arm 25 having a starting end 251 and an end 252 (the opening end 2 has at least two folds) so that the end 252 is substantially parallel to the joint surface m The edge 121 extends toward the beginning end 251 thereof, and the length of the second metal arm 25 is longer than the length of the first metal arm 14; and a younger arm 16 is substantially perpendicular to the upper edge of the ground plane 121. The sub-hunt is formed by the starting end 141 connecting the first metal arm and the starting end 251 of the second arm, forming the asymmetrically-shaped metal arm 13, and the third metal arm 16 includes a feeding Point (6); a short-circuited metal arm 17 having a substantially inverted L shape between the second metal arm and the ground plane 12, one end connected to the feed point 161 of the third metal arm, and the other end connected The short-circuit point 122 to the ground plane for electrically connecting the dome-shaped metal arm 13 to the ground plane 12; and a feed-in coaxial transmission line 18 comprising: a center conductor 181 connected to the third metal An arm feed point 161; and an outer ground conductor 182 connected to the ground plane Ground point 123. In the present embodiment 2, the τ-shaped metal arm 13 and the short-circuited metal arm 17 are formed by stamping or cutting a single piece of metal, and the antenna of the present invention has the advantage of narrowing the antenna 'suitable for inclusion in In the wireless communication products, the communication function of the dual-frequency operation is achieved. 3 is a return loss measurement result according to Embodiment 2 of the antenna of the present invention; in Embodiment 2, in order to consider the ground plane environment built in the LCD screen of the notebook computer, we select the length of the ground plane 12 to be about 260 mm, The width of the first metal arm 14 is about 8 mm and the width is about ^ mm; the length of the second metal arm 25 is about 31 mm, and the width is about i 200803049: Bean Road: ί: The length of the metal arm 16 is about 4 mm and the width is about ι_; Experiment = length 1 is about 17 mm and width is about 1 mm. By the widest possible, i: the return loss is less than 10dB _ defined, the operating frequency, "called the wireless local area network (WLAN) z4gh GHz) ^ 5 GHz (5.15-5.35, 5.725-5.875 GHz) ^ ^ ^ ^ t ^ Figure 4 is a first other embodiment 4 of the present invention, the first metal arm = having a single bend, and the end 442 is substantially parallel to the edge of the altar square of the ground plane. Extending away from the ground plane 12, the first metal arm 44 is substantially formed in an -L shape, and the purpose is to reduce the size of the antenna and reduce the space occupied by the entire antenna. / Figure 5 is another embodiment 5 of the present invention. The first metal arm 54 is bent twice, and its end 542 is substantially parallel to the upper edge ι2 of the ground plane and faces the starting end 541 thereof. The direction extends such that the first metal arm 54 is substantially formed in a meander shape, and the initial end 541 of the first metal arm is different from the initial position of the second metal arm and the second metal arm 16 is connected to the third metal arm 16 . The first and the other embodiments can achieve similar operational characteristics as one embodiment of the present invention (Fig. 2). The embodiments described in the above description are merely illustrative of the principles and advantages of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention is set forth in the appended claims. 200803049 • [Simple description of the diagram] The f1 diagram is the structure diagram of the inverted F-shaped antenna. Fig. 2 is a structural view showing an embodiment of an antenna according to the present invention. Fig. 3 is a structural measurement result of the return loss of the antenna-embodiment of the present invention. Fig. 4 is a structural view showing the first other embodiment of the invention. Fig. 5 is a structural view showing a second embodiment of the antenna of the present invention. [Main component symbol description] 1 ··Family inverted F antenna 12 • Ground plane or notebook computer LCD screen support metal back panel I21 · One edge of the ground plane, 122: Short circuit point, · 123 : grounding point 13: asymmetric T-shaped metal arm 14 · first metal tube 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 second metal arm. 16 β third metal arm 161 one end of the second metal arm or antenna feeding point 200803049 17 : shorting metal arm 18 feeding coaxial transmission line 181 feeding the center conductor 182 of the coaxial transmission line Inverted transmission line outer layer grounding guide 2 antenna of the invention is an embodiment 25 second metal arm 251 second metal arm starting end 252 second metal arm end 31: : first resonant mode 32: second resonant mode 4 First Other Embodiment 44 of the Antenna of the Invention First Metal Arm 441 Starting End of First Metal Arm 442 End of First Metal Arm 5 Second Other Embodiment 54 of Antenna of the Invention First Genus first arm end 541 of the metal arm 542 of the first starting end of the metal arm 12