200901567 九、發明說明： 【發明所屬之技術領域】 本發明係為一種雙頻天線，特別是一種具有電磁相容 特性的雙頻天線，適合應用在無線通訊產品中。 【先前技術】 隨著無線通訊的蓬勃發展，各種通訊技術的應用也越 來越廣泛，因此天線的性能便成為影響無線通訊產品的重 要關鍵之一。現今的筆記型電腦中不僅能操作於無線區域 網路（wireless local area network)，而亦可操作於無線廣域網路 (wireless wide area network)，增加了筆記型電腦於各區域使用 時的便利性。同時由於應用於筆記型電腦的通訊系統增加 ，相對地所需的内藏式天線數量也因此增加。然而，筆記 型電腦内部所能配置天線的空間有限，相關之先前技術如 台灣新型專利第M307,204號“多頻天線組合”，其揭示一 種利用筆記型電腦液晶螢幕内建的接地面，在該接地面上 設計多天線組合的例子，不過該設計實際操作時，天線元 件之間必須具有間有一隔離距離以減少天線元件之間的電 磁耦合效應，藉此維持良好之天線效能。為了解決此一問 題，我們提出一種具有電磁相容特性的雙頻天線，不僅可 降低天線間的電磁耦合影響，同時天線可以操作於無線廣 域網路（wireless wide area network)，其頻寬可涵蓋全球通訊系 統（GSM,890~ 960MHz)與數位通訊系統（DCS, 1710 〜1880 MHz)等雙頻帶之操作需求，並適合内藏於筆記型電腦内部 200901567 使用。 【發明内容】 如上所述，本發明之目的在於提供一種具有電磁相容 特性之雙頻天線。本發明包括：一接地面，形狀大致為一 矩形，具有一上方邊緣，而在該接地面之上方邊緣附近具 有一接地點與一連接點；一輻射金屬部，位於該接地面之 ,上方邊緣附近，其包含：一第一子金屬臂，大致平行於該 接地面之上方邊緣；一第二子金屬臂，位於該第一子金屬 臂與該接地面之間，並大致平行於該接地面之該上方邊緣 丄一第三子金屬臂，大致垂直於該接地面之上方邊緣，並 藉由連接該第一子金屬臂之起始端與該第二子金屬臂之起 始端形成該輻射金屬部，且該第三子金屬臂包含一饋入點 ;—短路金屬部，位於該接地面之上方邊緣附近，其包含 :—短路金屬臂’大致垂直於該接地面之上方邊緣，並連 -接至該接地面之連接點；一連接金屬臂，大致平行於該接 地面，^方邊緣，具有一起始端及一末端，該起始端連接 至該第三子金屬臂，該末端連接至該短路金屬臂，使該短 路金屬部大致形成一 τ形；及一饋入同輛傳輸線，包含： 中心導線，連接至該第三子金屬臂之饋人點；及一外層 接地導體，連接至該接地面之接地點。同時該輕射金屬部 二該短路金屬部與該接地面由—單—金屬片沖壓或 作而成。 & 在本項設計中，該輻射金屬臂之該第一子金屬臂之長 200901567 度與：第三子金屬臂之長度之和，接近該天線之該第一共 振模態中心頻率之1/4波長，該輻射金屬部之該第二子金 屬臂之長度與該第三金屬臂之長度之和，接近該天線之該 弟二共振模態中心頻率之1/4波長。因此，藉由調整該輕 射金屬部之該第-子金屬臂與該第三子金屬臂長度之和、 該輻射金屬部之該第二子金屬臂與該第三子金屬臂長度之 L可以付到本發明天線之雙頻操作，其操作頻寬涵蓋目 #無線廣域網路（WWAN)所需之全球通訊純（㈣，獅〜 960 MHz)與數位通訊系統（DCS，m〇〜i88〇 MHz)等雙頻帶之 操作需求。並且利用-連接金屬臂連接該輕射金屬部至該 紐路金屬臂，而由於該短路金屬部大致垂直於該接地面之 上方邊緣，並連接至該接地面，使得該天線得以阻絕在短 路金屬臂外測金屬或天線元件的電磁轉合影響，使得本發 明天線效能得以維持不會降低，可輕易的與其他金屬或^ 線兀件共同配置。同時本發明天線達成雙頻操作之通訊功 能0 【實施方式】 參考第1圖’本發明之雙頻天線一實施例】，包含： 一接地面11，形狀大致為一矩形，具有一上方邊緣ηι ， 而在該接地面11之上方邊緣U1附近具有—接地點112與 一連接點113 ; —輻射金屬部12，位於該接地面11之上方 邊緣in附近，用於產生該天線之—第—共振模態31與一 第二共振模態32 ’其包含：—第—子金屬臂13，大致平行 200901567 於該接地面11之上方邊緣ιη ; 一第二子金屬臂14，位於 該第一子金屬臂13與該接地面η之間，並大致平行於該接 地面11之上方邊緣m ;及一第三子金屬臂15，大致垂直 於該接地面11之上方邊緣m ，並藉由連接該第一子金屬 臂13之起始端與該第二子金屬臂14之起始端形成該輻射金 屬部12 ’且該第三子金屬臂15包含一饋入點151 ; 一短路 金屬部16，位於該接地面u之上方邊緣U1附近，其包含 Γ : 一短路金屬臂Π，大致垂直於該接地面u之上方邊緣 111 並連接至5亥接地面11之連接點113 ; —連接金屬臂 18,大致平行於該接地面n之上方邊緣m ，具有一起始 端181及一末端182，該起始端181連接至該第三子金屬 臂15，該末端182連接至該短路金屬臂17，使該短路金屬 部16大致形成一 τ形；及一饋入同軸傳輸線19，包含：一 中心導線191 ，連接至該第三子金屬臂15之饋入點151 ; 『及外層接地導體192 ’連接至該接地面u之接地點η2 -在本只知例1中，該輪射金屬部、該短路金屬部16與 該接地面11由一單一金屬片沖壓或切割製作而成，且本發 明天線具有電磁相容特性的優點，適合内藏於無線通訊產 品中’達成雙頻操作之通訊功能。 一第2圖為本發明天線一實施例i結構圖與一鄰近金屬 元件21 構圖，在本實施例中，放置一鄰近金屬元件^， 其長度約為20mm和寬度為2〇_，並與本發明天線之間 距離為d。 第3圖為本發明天線一實施例i之返回損失量測結果 200901567 ;在實施例1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11之長度約為260 mm、寬度約為 200 mm ;該第一金屬臂13之長度約為90 mm、寬度約為2 mm ;該第二金屬臂14之長度約為30 mm、寬度約為2 mm ;該第三金屬臂15之長度約為14 mm、寬度約為2 mm ;該 短路金屬臂17之長度約為20 mm、寬度約為6 mm ;該連接 金屬臂18之長度約為21 mm、寬度約為2 mm。由所得實驗 / 結果，在返回損失小於6 dB的定義下，該操作頻寬涵蓋目 前無線廣域網路（WWAN)所需之全球通訊系統（GSM, 890~ 960 MHz)與數位通訊系統（DCS, 1710~1880 MHz)等雙頻帶之 操作需求。 第4圖為本發明天線一實施例1與一鄰近金屬元件21 之返回損失量測結果；在無置放鄰近金屬元件21情形下， 本發明天線所得到之曲線41分別與鄰近金屬元件緊貼本發 明天線所得到之面線42、鄰近金屬元件與本發明天線距離 (../為5 mm時所得到之曲線43比較，所得的結果差距皆微小。 由此可以看出本發明天線藉由短路金屬部16大幅降低該接 地面11上鄰近金屬元件21對於本發明天線一實施例1的影 響。 第5圖為本發明天線之第一其他實施例結構圖，其中 該第一子金屬臂13與該第三子金屬臂15具有一次以上之彎 折，可以藉此降低本發明天線之高度，同時在該短路金屬 部16上鑽一固定孔洞51，使本發明天線在於實際應用上較 易固定。 π 200901567 第6圖為本發明之第二其他實施例結構圖，本實施例 6與實施例1的整體結構大致相同，惟該輻射金屬部12與 該短路金屬部16係以印刷或蝕刻技術形成於一微波基板61 上’可以藉此縮小本發明天線之尺寸，進而達到縮小化之 目的。 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 背本發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。 12 200901567 【圖式簡單說明】 第1圖為本發明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與一鄰近金屬元 結構圖。 凡 第3圖為本發明天線一實施例之返回損失量測結果。 第4圖為本發明天線一實施例與_鄰近金屬元件之返回 損失量測結果。 …第5圖為本發明天線之第一其他實施例結構圖。 第6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】 I :本發明天線一實施例 II .接地面或筆記型電腦液晶螢幕（LCD)之支撐金屬 背板 in :接地面之一上方邊緣 以 112 :接地點 113 :連接點 12 :輻射金屬部 13 •第一子金屬臂 14 :第二子金屬臂 15 •第三子金屬臂 151 :第三子金屬臂之—端或天線饋入點 16 :短路金屬部 17 :短路金屬臂 13 200901567 18 :連接金屬臂 181 :連接金屬臂之起始端 182 .連接金屬臂之末端 19 :饋入同軸傳輸線 191 :饋入同軸傳輸線之中心導線 192 .饋入同軸傳輪線之外層接地導體 21 :鄰近金屬元件 31 :第一共振模態 32 :第二共振模態 41 .热鄰近金屬凡件情形下，本發明天線所得到之曲 線 42 :鄰近金屬元件緊貼本發明天線所得到之曲線 43 :鄰近金屬元件與本發明天線距離為5 mm日夺戶斤得劍 之面線 5 :本發明天線之第二其他實施例 51 :固定孔洞 6 :本發明天線之第三其他實施例 61 :微波基板 d :距離 14200901567 IX. Description of the Invention: [Technical Field] The present invention is a dual-band antenna, and in particular, a dual-frequency antenna having electromagnetic compatibility characteristics, and is suitable for use in a wireless communication product. [Prior Art] With the rapid development of wireless communication, the application of various communication technologies is becoming more and more extensive, so the performance of the antenna becomes one of the important keys affecting wireless communication products. Today's notebook computers can operate not only in a wireless local area network, but also in a wireless wide area network, which increases the convenience of the notebook in various areas. At the same time, as the number of communication systems applied to notebook computers increases, the number of relatively required built-in antennas increases. However, there is limited space for configuring the antenna inside the notebook computer, and related prior art such as Taiwan's new patent No. M307,204 "multi-frequency antenna combination", which discloses a grounding surface built in the liquid crystal screen of the notebook computer. An example of a multi-antenna combination is designed on the ground plane. However, in actual operation of the design, there must be an isolation distance between the antenna elements to reduce the electromagnetic coupling effect between the antenna elements, thereby maintaining good antenna performance. In order to solve this problem, we propose a dual-band antenna with electromagnetic compatibility, which not only reduces the electromagnetic coupling effect between the antennas, but also operates the antenna in a wireless wide area network, and its bandwidth can cover the whole world. The dual-band operation requirements of the communication system (GSM, 890~960MHz) and digital communication system (DCS, 1710 ~ 1880 MHz) are suitable for use in the internal 01010567 of the notebook. SUMMARY OF THE INVENTION As described above, it is an object of the present invention to provide a dual-frequency antenna having electromagnetic compatibility characteristics. The invention comprises: a ground plane having a shape substantially a rectangle having an upper edge and having a grounding point and a connecting point near the upper edge of the grounding surface; a radiating metal portion located at the upper edge of the grounding surface Nearby, comprising: a first sub-metal arm substantially parallel to an upper edge of the ground plane; a second sub-metal arm located between the first sub-metal arm and the ground plane, and substantially parallel to the ground plane The upper edge is a third sub-metal arm substantially perpendicular to the upper edge of the ground plane, and the radiating metal portion is formed by connecting the start end of the first sub-metal arm and the start end of the second sub-metal arm And the third sub-metal arm includes a feed point; the short-circuit metal portion is located near the upper edge of the ground plane, and includes: the short-circuit metal arm is substantially perpendicular to the upper edge of the ground plane, and is connected a connection point to the ground plane; a connection metal arm substantially parallel to the ground plane, and an edge having an initial end and an end, the start end being connected to the third sub-metal arm, the end connection Up to the short-circuited metal arm, the short-circuited metal portion is formed substantially in a τ shape; and a feed into the same transmission line, comprising: a center conductor connected to the feed point of the third sub-metal arm; and an outer ground conductor connected To the ground point of the ground plane. At the same time, the light-emitting metal portion 2 and the grounding surface are stamped or formed of a single-metal piece. & In this design, the length of the first sub-metal arm of the radiating metal arm is 200901567 degrees and the length of the third sub-metal arm is close to the center frequency of the first resonant mode of the antenna. At 4 wavelengths, the sum of the length of the second sub-metal arm of the radiating metal portion and the length of the third metal arm is close to a quarter wavelength of the center frequency of the resonant mode of the antenna. Therefore, by adjusting the sum of the lengths of the first sub-metal arm and the third sub-metal arm of the light-emitting metal portion, the length of the second sub-metal arm of the radiating metal portion and the length of the third sub-metal arm may be The dual-band operation of the antenna of the present invention covers the global communication pure ((4), lion ~ 960 MHz) and digital communication system (DCS, m〇~i88〇MHz) required by the #Wireless Wide Area Network (WWAN). ) The operating requirements of dual bands. And connecting the light metal part to the metal arm of the new road by using a connecting metal arm, and the short circuit metal part is substantially perpendicular to the upper edge of the grounding surface and connected to the grounding surface, so that the antenna is blocked in the short circuit metal The electromagnetic switching effect of the metal or antenna element is measured outside the arm, so that the performance of the antenna of the present invention can be maintained without being reduced, and can be easily configured together with other metal or wire components. At the same time, the antenna of the present invention achieves the communication function of the dual-frequency operation. [Embodiment] Referring to FIG. 1 , an embodiment of the dual-frequency antenna of the present invention includes: a ground plane 11 having a substantially rectangular shape and an upper edge ηι , in the vicinity of the upper edge U1 of the ground plane 11 , there is a grounding point 112 and a connection point 113 ; the radiation metal portion 12 is located near the upper edge in of the ground plane 11 for generating the first resonance of the antenna The mode 31 and a second resonant mode 32' comprise: a first sub-metal arm 13 substantially parallel to the upper edge of the ground plane 11 of 200901567; a second sub-metal arm 14 located at the first sub-metal Between the arm 13 and the ground plane η, and substantially parallel to the upper edge m of the ground plane 11; and a third sub-metal arm 15 substantially perpendicular to the upper edge m of the ground plane 11 and connected by the A starting end of a sub-metal arm 13 and a starting end of the second sub-metal arm 14 form the radiating metal portion 12' and the third sub-metal arm 15 includes a feeding point 151; a short-circuit metal portion 16 at the connection Near the upper edge U1 of the ground u And comprising: a short-circuited metal arm Π substantially perpendicular to the upper edge 111 of the ground plane u and connected to the connection point 113 of the 5 hp ground plane 11; the connection metal arm 18 substantially parallel to the ground plane n The edge m has a starting end 181 and an end 182, the starting end 181 is connected to the third sub-metal arm 15, and the end 182 is connected to the short-circuiting metal arm 17, so that the short-circuiting metal portion 16 is substantially formed into a z-shape; a feed-in coaxial transmission line 19, comprising: a center conductor 191 connected to the feed point 151 of the third sub-metal arm 15; and "the outer ground conductor 192' is connected to the ground point η2 of the ground plane u - in this In the example 1, the metal portion of the wheel, the short metal portion 16 and the ground surface 11 are formed by stamping or cutting a single metal piece, and the antenna of the invention has the advantage of electromagnetic compatibility, and is suitable for being embedded in the wireless In the communication products, the communication function of the dual-frequency operation is achieved. Figure 2 is a structural view of an embodiment of the antenna of the present invention and a structure of an adjacent metal component 21. In this embodiment, an adjacent metal component is placed, the length of which is about 20 mm and the width is 2 〇 _, and The distance between the antennas of the invention is d. Figure 3 is a return loss measurement result 200901567 of the embodiment i of the antenna of the present invention; in the first embodiment, in order to consider the built-in ground plane environment of the notebook LCD screen, we select the ground plane 11 to have a length of about 260 mm. The width of the first metal arm 13 is about 90 mm and the width is about 2 mm; the length of the second metal arm 14 is about 30 mm and the width is about 2 mm; the third metal arm The length of 15 is about 14 mm and the width is about 2 mm; the length of the shorted metal arm 17 is about 20 mm and the width is about 6 mm; the length of the connecting metal arm 18 is about 21 mm and the width is about 2 mm. From the experimental/results obtained, the operating bandwidth covers the global communication systems (GSM, 890~960 MHz) and digital communication systems (DCS, 1710) required for current wireless wide area networks (WWAN), with a return loss of less than 6 dB. ~1880 MHz) and other dual-band operational requirements. Figure 4 is a measurement result of the return loss of an antenna 1 and an adjacent metal component 21 of the present invention; in the case where the adjacent metal component 21 is not placed, the curve 41 obtained by the antenna of the present invention is closely attached to the adjacent metal component, respectively. Compared with the curve 43 obtained by the antenna of the present invention and the adjacent metal element and the distance of the antenna of the present invention (../5 mm), the difference between the results is small. It can be seen that the antenna of the present invention is used by The short-circuit metal portion 16 substantially reduces the influence of the adjacent metal member 21 on the ground plane 11 on the antenna of the present invention. FIG. 5 is a structural view of the first other embodiment of the antenna of the present invention, wherein the first sub-metal arm 13 The first sub-metal arm 15 has one or more bends, thereby reducing the height of the antenna of the present invention, and simultaneously drilling a fixing hole 51 on the short-circuit metal portion 16, so that the antenna of the present invention is relatively easy to be fixed in practical applications. π 200901567 FIG. 6 is a structural view of a second other embodiment of the present invention, and the sixth embodiment is substantially the same as the overall structure of the first embodiment, except that the radiating metal portion 12 and the short-circuited metal portion 16 Forming on a microwave substrate 61 by printing or etching technology can reduce the size of the antenna of the present invention, thereby achieving the purpose of downsizing. The embodiments described in the above description are merely illustrative of the principle and function of the present invention. The invention is not limited by the spirit of the invention, and the scope of the invention is as set forth in the appended claims. 12 200901567 1 is a structural diagram of an embodiment of an antenna according to the present invention. FIG. 2 is a structural diagram of an embodiment of an antenna according to the present invention and a structure of an adjacent metal element. FIG. 3 is a return loss measurement of an antenna according to an embodiment of the present invention. The fourth figure is the result of the return loss measurement of the antenna of the present invention and the adjacent metal component. Fig. 5 is a structural diagram of the first embodiment of the antenna of the present invention. 2. Structure diagram of other embodiments. [Explanation of main component symbols] I: Antenna of the present invention is an embodiment II. Supporting metal of a ground plane or a liquid crystal display (LCD) of a notebook computer Board in: upper edge of one of the ground planes 112: grounding point 113: connection point 12: radiating metal part 13 • first sub-metal arm 14: second sub-metal arm 15 • third sub-metal arm 151: third sub-metal Arm-end or antenna feed point 16: Short-circuit metal part 17: Short-circuit metal arm 13 200901567 18: Connection metal arm 181: Connecting the starting end of the metal arm 182. Connecting the end of the metal arm 19: Feeding the coaxial transmission line 191: Feed Into the coaxial transmission line center conductor 192. Feed the coaxial transmission line outer layer ground conductor 21: adjacent metal element 31: first resonance mode 32: second resonance mode 41. In the case of thermal adjacent metal parts, the antenna of the present invention Curve 42 obtained: Curve 43 obtained by abutting the metal component against the antenna of the present invention: the distance between the adjacent metal component and the antenna of the present invention is 5 mm, and the face of the sword is 5: the second other implementation of the antenna of the present invention Example 51: Fixed Hole 6: Third Other Embodiment 61 of the Antenna of the Invention: Microwave Substrate d: Distance 14