,1295517 九、發明說明： . 【發明所屬之技術領域】 本發明係為一種内藏式行動通訊天線，特別是可多頻 操作之内藏式行動通訊天線，適合應用在無線通訊產品上 【先前技術】 行動通訊的發展越來越廣泛，所衍生的通訊產品也 _ 越來越多樣化’除了手機和個人數位助理（PDA)之外， 行動通Λ也將成為筆記型電腦的基本功能。目前習用於 無線通訊產品的多頻天線大多均應用在無線區域網路所 需的 2.4 GHz (2.4-2.484 GHz)及 5 GHz (5.15-5.35, 5.725-5.875 GHz)頻帶；台灣專利公告號第257,522號“多頻天線，，及 台灣專利公告號第258,432號“多頻天線，，，所揭示一種 利用筆記型電腦液晶螢幕所内建的接地面，在其接地面 上設計多頻天線的例子。若我們應用上述天線設計一種 _ 應用在打動通訊系統的多頻天線時，會發現天線的尺寸 過大，不易内藏於通訊產品中。為解決此一問題，我們 提出種創新。又口十，可縮小天線尺寸並内藏於通訊產品 中，且可涵盍目刖行動通訊系統GSM (89〇_96〇 MHz)、 DCS(171(M88〇MHz)、pCS(185(M990MHz)與·TS (1920-2170 MHz)所須之頻帶需求。 .1295517 【發明内容】 如上所述，本發明之㈣在於提供—财内藏 通讯產品之多頻天線。本發明包括：—接地面，形狀 矩形’具有一上方邊緣及一相對於該上方邊緣 下方邊緣，而在該接地面之上方邊緣附近且有一 :接：第一短路點與一第二短路點，該第二短路點位於 ^接地點與該第—短路點之間；—介質基板，形狀大致 =矩形’其-長邊連接至該接地面之上方邊緣，該介 貝基板並朝向遠離該接地面之方向延伸；一第一金屬臂 ，形狀大致為-倒L形，位於該介f基板之上，該第一 :屬臂具有一起始端及一末端，而該起始端為該天線之 饋^點，位於該接地面之接地點附近，而該末端大致以 平行該接地面之上方邊緣’並朝向該接地面之第一短路 點f向延伸；一第二金屬臂’形狀大致為-倒L形，位 介質基板之上’該第二金屬臂具有一起始端及一末 知山及起始端電氣連接至該接地面之第一短路點，而該 末而大致以平行$接地面之上方邊緣，並朝向該天線之 饋入點方向延伸，同時該第二金屬臂之末端與該第-金 屬#之末知具有一耦合部分，使得該第二金屬臂與該第 王屬#大致形成—η字形；—寄生金屬臂，形狀大致 為倒L形，位於該介質基板之上，且該寄生金屬臂之 =端電氣連接至該接地面之第二短路點，該寄生金屬臂 並被名第—金屬臂與該第一金屬臂一 轴傳輸線，包含：-中心導線，連接至該第一金；臂之 Ϊ295517 饋入點；及一外層接地導體，連接至該接地面之接地點 … 。同日寸该第一金屬臂、該第二金屬臂與該寄生金屬臂由 印刷或餘刻技術形成於一介質基板上。 在本項設計中，該第一金屬臂長度與該第二金屬臂 長度之和接近該天線之第一共振模態中心頻率之1/4波 長，且該寄生金屬臂之長度接近該天線之第二共振模態 中心頻率之1/4波長，另該第一金屬臂之長度接近該二 線，第三共振模態中心頻率之1/4 &長。因此，藉由調 • 整该第一金屬臂與該第二金屬臂長度之和、該寄生金屬 臂之長度及該第一金屬臂之長度，可以得到本發明天線 之多頻操作。 【實施方式】 參考第1圖，本發明之—種内藏式多頻天線一實施 例1包括··一接地面12，形狀大致為一矩形，具有一上 方邊緣12U-相對於該上方邊緣之下方邊緣122，而 ㈣接地面之上方邊緣121附近具有_接地點123、一 ^ -短路點124與一第二短路點125，該第二短路點 f位於該接地點123與該第一短路點以之間；一介 2:13 ’形狀大致為一矩形，其一長邊131連接至該 :1 =方邊緣121 ’該介f基板13並朝向遠離該接 也：12之方向延伸；-第-金屬臂Η，形狀大致為一倒 =^位於該介質基板13之上，該第_金屬臂Μ具有一 巳°'而141及一末端142，而該起始端為該天線之饋入 1295517 點141 ，位於該接地面之接地點123附近，而該末端 M2大致以平行該接地面之上方邊緣12ι ，並朝向該接 _ 地面之第_短路點124方向延伸；一第二金屬臂Μ，形 狀大致為一倒L形，位於該介質基板13之上，該第二金 屬臂15具有一起始端151及一末端152，該起始端151 電氣連接至該接地面之第一短路點124，而該末端152 大致以平行該接地面之上方邊緣121 ，並朝向該天線之 饋=點141方向延伸，同時該第二金屬臂之末端152與 人專金屬臂之末端142具有一 |馬合部分，使得該第二 金屬臂15與該第一金屬臂14大致形成一门字形；一寄生 孟屬# 16，形狀大致為一倒L形，位於該介質基板13之 士，且該寄生金屬臂之一端161電氣連接至該接地面之 第:短路點125，該寄生金屬臂16並被該第二金屬臂15 二^第孟屬# 14所包圍；及一饋入同軸傳輪線17，包 含·一中心導線171，連接至該第-金屬臂之饋入點 14丨；及一外層接地導體172，連接至該接地面之接地 點月123。在本實施例1中，該第-金屬臂14、該第二金 ^ ” "亥可生金屬臂16由印刷或蝕刻技術形成於一介 貝基板13上，同時該第一金屬臂之末端⑷與該第二金 屬臂之末端152具有一輕合長度(d)，以此配置方式可達 成可夕頻作之内藏式行動通訊天線，同時滿足行動 通訊系統所需之頻帶要求。 第圖為本毛明天線一實施例1的返回損失量測結 在實施例1中，我們選擇介質基板為」厚度為 1295517 〇.4mmiFR4玻璃纖維基板；該接地面]2之長卢約為 ⑽麵、寬度約為200麵，·該第一金屬臂14之1度约為 36麵、寬度約為2mm;該第二金屬臂15之長度約為 5〇mm、見度約為2mm ;該寄生金屬臂16之長度約為 35 mm、寬度約為2麵；該第一金屬臂之末端⑷斑該 ^二金屬臂之末端142之耦和距離⑼為1〇mm。由所得 實驗結果，在返回損失小於73dB的定義下，該第一共 振模態21足以涵蓋GSM (89〇_96〇 MHz) 蕻 /' 合該第二共振模態22與第三共振模態23，其具 480MHz之操作頻I，可以輕易地涵蓋加8(171〇_1細 MHz)、PCS (1850_1990 MHz)與 UMTS (1920-2170 MHz)所須之 頻帶需求。 第3圖為本發明之第一其他實施例3，可將該介質 基板13經由彎折線332做一次彎折，其目的在於減少天 線整體所佔用的高度。 第4圖為本發明之第二其他實施例4，該第二金屬 臂可具有一第一末端452及一第二末端453 ，同時該第 金屬’ 15之苐一末端452與該第一金屬臂之末端m2 具有一耦合長度(d)，且該第二金屬臂之第二末端453接 近该第一金屬臂之末端142 ，其目的在於該第二金屬臂 之第二末端453可增進該天線之第二模態22之頻寬。 以上。兒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 1295517 發明之權利範園如後述之申請專利範圍所列。 【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之返回損失實驗量測結 果。 第3圖為本發明天線之第一其他實施例結構圖。 第4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 :本發明天線一實施例 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 :接地面之一下方邊緣 123 :接地點 > 124 :第一短路點 125 :第二短路點 13 :介質基板 131 ·介質基板之一長邊 14 :第一金屬臂 141 :第一金屬臂之起始端或天線之饋入點 142 :第一金屬臂之末端 15 :第二金屬臂 J295517 151 第二金屬臂之起始端 152 第二金屬臂之末端 ^ 16 寄生金屬臂 161 寄生金屬臂之一端 17 饋入同軸傳輸線 171 饋入同軸傳輸線之中心導線 172 饋入同軸傳輸線之外層接地導體 d 第一金屬臂末端與第二金屬臂末端間之耦合長度 • 21 第一共振模態 22 第二共振模恶 23 第三共振模態 3 :本發明天線之第一其他實施例 332 :彎折線 4 :本發明天線之第二其他實施例 452 ··第二金屬臂之第一末端 第二金屬臂之第二末端 453, 1295517 IX. Description of the invention: [Technical field of the invention] The present invention is a built-in mobile communication antenna, in particular, a multi-frequency operation built-in mobile communication antenna, suitable for use in wireless communication products. Technology] The development of mobile communication is more and more extensive, and the communication products derived from it are also becoming more and more diverse. In addition to mobile phones and personal digital assistants (PDAs), mobile phones will become the basic functions of notebook computers. Most of the multi-frequency antennas currently used in wireless communication products are used in the 2.4 GHz (2.4-2.484 GHz) and 5 GHz (5.15-5.35, 5.725-5.875 GHz) bands required for wireless local area networks; Taiwan Patent Publication No. 257,522 No. "Multi-frequency antenna," and Taiwan Patent Publication No. 258,432 "Multi-frequency antenna," discloses an example of designing a multi-frequency antenna on a ground plane using a ground plane built in a notebook computer LCD screen. If we use the above antenna to design a multi-frequency antenna that is used to impress the communication system, we will find that the size of the antenna is too large and it is not easy to be embedded in the communication product. To solve this problem, we propose innovation. It can also reduce the size of the antenna and is embedded in the communication products. It can cover the mobile communication system GSM (89〇_96〇MHz), DCS (171(M88〇MHz), pCS(185(M990MHz)). The frequency band requirement for the TS (1920-2170 MHz). 1295517 [Description of the Invention] As described above, the fourth aspect of the present invention provides a multi-frequency antenna for a communication product. The present invention includes: a ground plane, The shape rectangle 'has an upper edge and a lower edge relative to the upper edge, and near the upper edge of the ground plane, there is: a first short circuit point and a second short circuit point, and the second short circuit point is located Between the location and the first short circuit point; - the dielectric substrate, the shape is substantially = rectangular 'the long side is connected to the upper edge of the ground plane, the dielectric substrate extends in a direction away from the ground plane; a first metal The arm has a substantially inverted-L shape and is located above the substrate. The first arm has an initial end and an end, and the starting end is a feeding point of the antenna, and is located at a grounding point of the grounding surface. Nearby, and the end is substantially parallel to the ground plane The square edge ' extends toward the first short-circuit point f of the ground plane; a second metal arm' has a substantially inverted-L shape, and the second metal arm has a starting end and a terminal mountain And the initial end is electrically connected to the first short-circuit point of the ground plane, and the end is substantially parallel to the upper edge of the ground plane and extends toward the feed point of the antenna, and the end of the second metal arm The end of the first metal has a coupling portion such that the second metal arm and the second king are substantially formed into an n-shape; the parasitic metal arm has a substantially inverted L shape and is located on the dielectric substrate, and The = terminal of the parasitic metal arm is electrically connected to the second short circuit point of the ground plane, and the parasitic metal arm is connected to the first metal arm and the first metal arm by an axis transmission line, and includes: a center wire connected to the first a gold; an arm 295517 feed point; and an outer ground conductor connected to the ground point of the ground plane. The same metal arm, the second metal arm and the parasitic metal arm are printed or engraved by the same day Formed in a medium In the present design, the sum of the length of the first metal arm and the length of the second metal arm is close to a quarter wavelength of the first resonant mode center frequency of the antenna, and the length of the parasitic metal arm is close to the The second resonant mode center frequency of the antenna is 1/4 wavelength, and the length of the first metal arm is close to the second line, and the third resonant mode center frequency is 1/4 & long. Therefore, by adjusting The multi-frequency operation of the antenna of the present invention can be obtained by the sum of the lengths of the first metal arm and the second metal arm, the length of the parasitic metal arm, and the length of the first metal arm. [Embodiment] Referring to FIG. EMBODIMENT OF THE INVENTION A built-in multi-frequency antenna embodiment 1 includes a ground plane 12 having a substantially rectangular shape with an upper edge 12U - opposite the lower edge 122 of the upper edge and (4) above the ground plane The edge 121 has a grounding point 123, a short circuit point 124 and a second short circuit point 125. The second short circuit point f is located between the grounding point 123 and the first short circuit point; a 2:13 shape It is roughly a rectangle with a long side 131 connected to it: 1 = square edge 121 'the f substrate 13 extends in a direction away from the connection: 12; - the first metal arm Η, the shape is substantially a reverse = ^ located on the dielectric substrate 13, the first metal arm Μ There is a '° 141 and an end 142, and the starting end is the feed 1295517 point 141 of the antenna, located near the grounding point 123 of the ground plane, and the end M2 is substantially parallel to the upper edge 12ι of the ground plane, And extending toward the first _ short-circuit point 124 of the ground; a second metal arm Μ having a substantially inverted L shape, located above the dielectric substrate 13, the second metal arm 15 having a starting end 151 and a The end 152 is electrically connected to the first short circuit point 124 of the ground plane, and the end 152 is substantially parallel to the upper edge 121 of the ground plane and extends toward the feed point 141 of the antenna, and the The end 152 of the two metal arms and the end 142 of the metal arm of the person have a mating portion, such that the second metal arm 15 and the first metal arm 14 form a gate shape; a parasitic genus #16, the shape is substantially An inverted L shape on the dielectric substrate 1 3, and one end 161 of the parasitic metal arm is electrically connected to the first: the short-circuit point 125 of the ground plane, and the parasitic metal arm 16 is surrounded by the second metal arm 15 and the genus #14; Feeding to the coaxial transmission line 17, comprising a center conductor 171 connected to the feed point 14A of the first metal arm; and an outer ground conductor 172 connected to the ground point 123 of the ground plane. In the first embodiment, the first metal arm 14 and the second metal core 16 are formed on a slab substrate 13 by printing or etching techniques, and the end of the first metal arm (4) A light-weighted length (d) is formed with the end 152 of the second metal arm, and the built-in mobile communication antenna can be realized in a configurable manner, while meeting the frequency band requirements required for the mobile communication system. In the first embodiment, we select the dielectric substrate as a "thickness of 1295517 〇.4mmiFR4 fiberglass substrate; the length of the ground plane 2 is approximately (10) plane, width About 200 faces, the first metal arm 14 has about 1 degree of about 36 faces and a width of about 2 mm; the second metal arm 15 has a length of about 5 mm and a visibility of about 2 mm; the parasitic metal arm 16 The length is about 35 mm and the width is about 2 faces; the coupling end distance (9) of the end (4) of the first metal arm and the end 142 of the metal arm is 1 mm. From the experimental results obtained, the first resonance mode 21 is sufficient to cover GSM (89〇_96〇MHz) 蕻/′ in the second resonance mode 22 and the third resonance mode 23 under the definition that the return loss is less than 73dB. With its 480MHz operating frequency I, it can easily cover the band requirements required for adding 8 (171〇_1 fine MHz), PCS (1850_1990 MHz) and UMTS (1920-2170 MHz). Fig. 3 is a first other embodiment 3 of the present invention. The dielectric substrate 13 can be bent once via the bending line 332 for the purpose of reducing the height occupied by the entire antenna. 4 is a second embodiment 4 of the present invention, the second metal arm may have a first end 452 and a second end 453, and the first end 452 of the metal '15 and the first metal arm The end m2 has a coupling length (d), and the second end 453 of the second metal arm is adjacent to the end 142 of the first metal arm, the purpose of which is that the second end 453 of the second metal arm can enhance the antenna The bandwidth of the second mode 22. the above. The embodiments described in the above are merely illustrative of the principles and effects 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 of this 1295517 invention is listed in the scope of the patent application described later. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural view showing an embodiment of an antenna according to the present invention. Fig. 2 is a graph showing the results of the return loss test of an embodiment of the antenna of the present invention. Figure 3 is a structural view of a first other embodiment of the antenna of the present invention. Fig. 4 is a structural view showing a second embodiment of the antenna of the present invention. > [Main component symbol description] 1 : The antenna of the present invention is an embodiment 12: a ground plane or a support computer liquid crystal display (LCD) supporting metal back plate 121: one of the ground planes upper edge 122: one of the ground planes below the edge 123: grounding point > 124: first short-circuit point 125: second short-circuit point 13: dielectric substrate 131 • one long side of the dielectric substrate 14: first metal arm 141: the starting end of the first metal arm or the feeding of the antenna Point 142: end 15 of the first metal arm: second metal arm J295517 151 start end of the second metal arm 152 end of the second metal arm ^ 16 parasitic metal arm 161 one end of the parasitic metal arm 17 fed into the coaxial transmission line 171 feed The center conductor 172 of the coaxial transmission line is fed into the coaxial transmission line. The grounding conductor d is the coupling length between the end of the first metal arm and the end of the second metal arm. 21 First resonance mode 22 Second resonance mode 23 Third resonance mode 3 A first other embodiment of the antenna of the present invention 332: a bending line 4: a second other embodiment of the antenna of the present invention 452. · a first end of the second metal arm, a second end 453 of the second metal arm