1255588 -九、發明說明： 【發明所屬之技術領域】 • 丨發明係㈣於—種雙饋人雙頻天線，特別是應用 • 在無線通訊產品筆記型電腦上的天線。 【先前技術】 隨著無線通訊的發展，相關無線區域網路（wirdess :calareanetwork)產品的應用越來越廣泛，而天線設計的性 能亦成為影響通訊產品接收與傳輸訊號品質的重要關鍵之 -:台灣專利公告第563,274冑“雙頻天線”及台灣專利公 。第555,177 5虎多頻天線，均揭示—種利用筆記型電腦 液晶榮幕内建的接地面，在該接地面上設計一倒f形天線 的设计，不過該天線雖然適用於2 4 GHz (24〇〇_2484 MHz)及 5GHz(5150_5875 MHz)雙頻帶操作之無線區域網路模組，但 僅適用於-單一 2.4/5 GHz雙頻模組。對於應用在2 4 GHz及 5GHz使用不同之模組設計時，這些單饋人雙頻天線必須 .先連接至一切換電路，分離出兩個不同之饋入訊號（24 GHz及5 GHz) ’在饋接至相對應之模組。這種應用方式將 造成天線增益與頻寬的下降。為解決此一問題，我們提出 一種具有雙饋入之雙頻天線的創新設計，不僅可同時產生 —低頻操作頻帶涵蓋無線區域網路2.4GHz頻帶，一高頻操 作頻帶涵盍無線區域網路5 GHz頻帶，更因為其雙饋入之 特點，毋須於天線饋入端外加一切換電路，亦不會造成天 線特性降低，即可滿足應用於雙模組之需求。 1255588 ι 【發明内容】 如上所述，本發明之目的在於提供一種具有雙饋入之 雙頻天線的創新設計，可以產生一低頻操作頻帶=益線 ，域網路2.4 GHz (2400-2484 MHz)頻帶及—高賴作頻帶涵 蓋無線區域網路5 GHz(5150-5875 MHz)頻帶。本發明天線S 含：一接地面，其形狀大致為一矩形，而在該接地面之= ，邊，具有一第一接地點、一第二接地點與一短路點；— 第一輻射金屬臂’位於該接地面之該側邊處，大致、儿著該 側邊延伸，且具有一第一饋入點；一第二輕射金屬^，: 於该接地面之該側邊處，且朝向與該第一韓射金屬臂之相 反方向延伸，並具有-第二饋入點；一短路金屬臂，位於 亥接地面之該側邊處，且介於該第一輕射金屬臂 輕射金屬臂之間，並包含：一第一短路金屬臂， =至4弟一輪射金屬臂，另一端連接至該第二輕射金屬 ^及—第二短路金屬臂，其—端大致垂直連接於該第一 豆路金屬臂形成一 T开3結構，另一總 为為電軋連接至該接地面 ^ 路點’―第一饋人同軸傳輸、線，包含：一第—中心 ⑽，連接至該第-輕射金屬f之該第m及^ 二二層：地導體’連接至該接地面之該第一接地點 二 弟二饋入同軸傳輸線，包含：-第二中心導線，連接至 體亥弟=射金屬臂之該第二饋入點；及一第二外層接地導 —連接至该接地面之該第二接地點。 、 之長，？們可以藉由調整該第-輻射金屬臂 又又仔以天線弟一（較低）操作頻帶，且該第一輻 ^55588 射金屬臂之長度，接近該天線第—（較低）操作頻帶中心 湧率之1/4波長；以及藉由調整該第二輻射金屬臂之長 ^得到該天線第二（較高）操作頻帶，而該第二輕射金 #之長度接近該天線第二（較高）操作頻帶^心頻率之 1/4波長。 【實施方式】 f考第1圖，本發明之具有雙饋入雙頻天線一實施例 1包含··一接地面或筆記型電腦液晶螢幕（lcd)之支撐金 屬月板13，其形狀大致為一矩形5而在該接地面之一側邊 處具有一第一接地點131 、一第二接地點132與一短路 點133 ; —第一輻射金屬臂14，位於該接地面13之該側邊 處，大致沿著該側邊延伸，用於產生該天線之一第一（較 低）操作頻帶，且具有一第一饋入點141 ; 一第二輻射金 屬臂15，位於該接地面13之該側邊處，且朝向與該第一輻 射金屬臂14之相反方向延伸，用於產生該天線之一第二 (較尚）操作頻帶，並具有一第二饋入點151 ; 一短路金 屬臂16，位於該接地面13之該側邊處，且介於該第一輻射 金屬臂14與該第二輻射金屬臂15之間，並包含：一第一短 路金屬臂161 ，其一端連接至該第一輻射金屬臂14，另一 端連接至該第二輻射金屬臂15 ;及一第二短路金屬臂 M2 ，其一端大致垂直連接於該第一短路金屬臂161形成 —丁形結構，另一端電氣連接至該接地面之該短路點 133 ，一第一饋入同軸傳輸線，包含··一第一中心導線 l255588 171 ，連接至5亥弟一輪射金屬臂之該第一饋入點Μ〗·及 一第一外層接地導體172 ，連接至該接地面之該第一接地 點131 ;以及一第二饋入同軸傳輸線18，包含··一第二中 心導線181 ，連接至該第二輻射金屬臂之該第二饋入點 151 ;及一第二外層接地導體182，連接至該接地面之該 第二接地點132。在本實施例1中，該接地面13、該第一 輻射金屬臂14、該第二輻射金屬臂15與該短路金屬臂“係 由一單一金屬片沖壓⑻amping)或切割（cutting)製作而1255588 - Nine, invention description: [Technical field of invention] • 丨 invention system (4) in a kind of double-fed dual-frequency antenna, especially for applications • Antennas on wireless communication products notebook computers. [Prior Art] With the development of wireless communication, the related wireless local area network (wirdess: calareanetwork) products are more and more widely used, and the performance of antenna design has become an important key to affect the quality of communication products receiving and transmitting signals - Taiwan Patent Notice No. 563, 274 "Double Frequency Antenna" and Taiwan Patent. The 555, 177 5 Tiger multi-frequency antennas all reveal a grounding surface built into the LCD screen of a notebook computer, and an inverted-f antenna design is designed on the ground plane, although the antenna is suitable for 24 GHz (24〇). 〇_2484 MHz) and 5 GHz (5150_5875 MHz) dual-band wireless LAN modules, but only for a single 2.4/5 GHz dual-band module. For applications with different module designs at 24 GHz and 5 GHz, these single-fed dual-band antennas must be connected to a switching circuit to separate two different feed signals (24 GHz and 5 GHz). Feed to the corresponding module. This type of application will result in a drop in antenna gain and bandwidth. In order to solve this problem, we propose an innovative design with dual-input dual-frequency antenna, which can be generated at the same time. The low-frequency operating band covers the 2.4 GHz band of the wireless local area network, and the high-frequency operating band covers the wireless local area network. In the GHz band, because of its dual feed-in characteristics, it is not necessary to add a switching circuit to the antenna feed end, and the antenna characteristics are not reduced, so that the requirements for the dual module can be satisfied. 1255588 ι [ SUMMARY OF THE INVENTION As described above, it is an object of the present invention to provide an innovative design of a dual-frequency antenna with dual feed, which can generate a low frequency operating band = benefit line, domain network 2.4 GHz (2400-2484 MHz) The band and high-frequency bands cover the 5 GHz (5150-5875 MHz) band of the wireless local area network. The antenna S of the present invention comprises: a ground plane having a shape substantially a rectangle, and at the side of the ground plane, having a first ground point, a second ground point and a short circuit point; - the first radiating metal arm 'located at the side of the ground plane, extending substantially along the side, and having a first feed point; a second light metal, at the side of the ground plane, and facing Extending in a direction opposite to the first Korean metal arm and having a second feed point; a shorted metal arm located at the side of the ground contact surface and between the first light metal arm and the light metal Between the arms, and comprising: a first short-circuited metal arm, = 4 to a four-shot metal arm, the other end connected to the second light-emitting metal ^ and - a second short-circuited metal arm, the - end being substantially perpendicularly connected thereto The first bean road metal arm forms a T-open 3 structure, and the other is always electrically rolled to the ground plane ^ way point '-the first feed coaxial transmission line, including: a first center (10), connected to the The mth and ^22 layers of the first-light metal f: the first conductor connected to the ground plane The second two-node feeds into the coaxial transmission line, comprising: - a second center conductor connected to the second feed point of the body of the metal body; and a second outer grounding conductor - the first connection to the ground plane Two grounding points. , long,? By adjusting the first radiating metal arm and the antenna (lower) operating band, and the length of the first radiating metal arm is close to the center of the antenna - (lower) operating band a quarter wavelength of the inrush rate; and obtaining a second (higher) operating band of the antenna by adjusting the length of the second radiating metal arm, and the length of the second light gold # is close to the second of the antenna High) operating band ^ 1/4 wavelength of the heart frequency. [Embodiment] FIG. 1 is a supporting metal moon plate 13 having a double-fed dual-frequency antenna according to the present invention, including a ground plane or a notebook computer liquid crystal screen (lcd), and has a shape substantially a rectangle 5 having a first grounding point 131, a second grounding point 132 and a shorting point 133 at one side of the grounding surface; a first radiating metal arm 14 on the side of the grounding surface 13 Extending substantially along the side edge for generating a first (lower) operating frequency band of the antenna and having a first feed point 141; a second radiating metal arm 15 located at the ground plane 13 The side edge extends toward the opposite direction of the first radiating metal arm 14 for generating a second (preferred) operating frequency band of the antenna and has a second feeding point 151; a shorted metal arm The first radiating metal arm 14 is disposed between the first radiating metal arm 14 and the second radiating metal arm 15 and includes: a first shorting metal arm 161 connected to the first end a first radiating metal arm 14 having the other end connected to the second radiating metal arm 15; a second short-circuiting metal arm M2 having one end substantially perpendicularly connected to the first short-circuiting metal arm 161 to form a butyl structure, the other end electrically connected to the short-circuit point 133 of the grounding surface, and a first feeding coaxial transmission line, including a first center conductor l255588 171 connected to the first feed point of the 5th round metal arm and a first outer ground conductor 172 connected to the first ground point 131 of the ground plane And a second feed coaxial transmission line 18, comprising a second center conductor 181 connected to the second feed point 151 of the second radiating metal arm; and a second outer ground conductor 182 connected to the The second ground point 132 of the ground plane. In the first embodiment, the ground plane 13, the first radiating metal arm 14, the second radiating metal arm 15 and the shorting metal arm are "made" or cut by a single metal sheet.
成0 第2圖是本發明天線一實施例丨的反射係數π”、 S22)及隔離度（sy量測結果。在實施例i中，為模擬筆記 型電腦液晶螢i (LCD)之支撐金屬背板環境，我們選擇該 接地面13其長度約為26〇 mm、寬度約為2〇〇 ;該第一輻 射金屬臂14其長度約為22麵、寬度為2麵；該第二幸^ 射金屬臂15其長度約為llmm、寬度為2麵；該短路金 屬臂之該第-短路金屬臂⑹其長度約為6麵、寬度為工 mm，《亥短路金屬臂之該第二短路金屬臂162其長度約為 2m:、寬度為lmm。由所得實驗結果，在獅反射係數 的疋義下’其第一共振模態或較低操作頻帶以足以涵蓋 2.4GHz(2400姻MHz)無線區域網路頻帶，而在第二丑振 模態或較高操作頻帶22足㈣蓋5邮(5跡節·)之無 線=網路頻帶，而在隔離度23方面，兩模態之隔離 小於-15 dB。 第3 圖與弟4圖為本發明天線一 實施例1分別在輻射 !255588 步Wz與测廳的天線韓射場型量㈣果。 得的實施例測試結果，特別在χ-Ζ平面「紅 (貪口直面）及X-y _ 平面（水平面）的量測輻射場型，其天绩主西t 大綠主要的極化方向 為具有一錯直極化之特性。 第5圖為本發明天線一實施例於較低操作頻帶似 GHz)之天線增益實驗量測結果。由量測結果可知，較低摔 作頻帶之天線增益約為2·2〜2.5dBi，滿足無線區域網路系统 之操作需求。 第6圖為本發明天線一實施例於較高操作頻帶（5 GHz)之天線增益實驗量測結果。由量測結果可知，較低操 作頻帶之天線增益約為2·5〜3.0dBi，滿足無線區域網路系統 之操作需求。 第7圖為本發明天線之其他實施例結構圖。本實施例 7包括：一接地面或筆記型電腦液晶螢幕（LCD)2支撐金 屬月板13，其形狀大致為一矩形，而在該接地面之一側邊 處’具有一第一接地點131 、一第二接地點132與一短路 點133 ; —第一輻射金屬臂74，位於該接地面13之該側邊 處’大致沿著該側邊延伸，用於產生該天線之一第一（較 低）操作頻帶，且具有一第一饋入點741 ; 一第二輻射金 屬臂乃’位於該接地面13之該側邊處，且朝向與該第一輻 射金屬臂74之相反方向延伸，用於產生該天線之一第二 (較焉）操作頻帶，並具有一第二饋入點751 ; 一短路金 屬臂16 ’位於該接地面13之該側邊處，且介於該第一輻射 金屬臂74與該第二輻射金屬臂75之間，並包含··一第一短 1255588 '路金屬臂161 ，其一端連接至該第一輻射金屬臂74，另一 端連接至該第二輻射金屬臂75 ;及一第二短路金屬臂 •丨62 ，其一端大致垂直連接於該第一短路金屬臂161形成 • 一T形結構’另-端電氣連接至該接地面之該短路點^ 133 ; —第一饋入同軸傳輸線17，包含：一第—中心導線 171 ，連接至該第一輻射金屬臂之該第一饋入點74ι :及 一第一外層接地導體172 ，連接至該接地面之該第一接地 點131 ;以及一第二饋入同軸傳輸線18，包含：一第二中 •心導線181 ，連接至該第二輻射金屬臂之該第二饋入點 751 ;及-第二外層接地導體182，連接至該接地面之該 第二接地點132。本實施例7與實施例丨最大不同點，在 於該第一韓射金屬臂74與該第二輕射金屬臂75之末端皆呈 有一弯折，可以藉此一彎折縮小天線之尺寸，其他結構則 大致與實施例1相同。此外，該第一韓射金屬臂74、該第 二輻射金屬臂75與該短路金屬们6係由印刷或㈣技術形 成於一微波基板76上。 • 帛8圖為本發g月天線之另一其他實施例結構圖。本實 轭例8包括.一接地面或筆記型電腦液晶螢幕（lcd)之支 禮金屬背板83，其形狀大致為一矩形，而在該接地面之一 側邊處’具有—第—接地點831、一第二接地點纽、一 第一短路點833與一第二短路點834 ; 一第一天線84，位 於該接地面之該側邊處，大致沿著該側邊延伸，並包含： -第：輻射金屬臂841 ’用於產生該天線之一第一（較 低）操作頻帶，且具有一第一饋入點843 ;及一第一短路 11 1255588 金屬臂842，其—端連接至該第—輕射金屬臂84i，另一 端電氣連接至該接地面之該第一短路點⑻；一第二天線 85 ’位於該接地面之該側邊處，且朝向與該第—天線社 相反方向延伸，並包含：一第二輕射金屬臂851，用於產 生該天線之一第二（較高）操作頻帶，且具有-第二饋入 點853 ;及-第二短路金屬臂852，其一端連接至該第二 輕射金屬臂⑸，另-端電氣連接至該接地面之該第二短 路點834 ; —第一饋入同軸傳輸線17，包含：一第一中心 _導線171 ，連接至該第一輻射金屬臂之該第一饋入點 _ ;及-第-外層接地導體172，連接至該接地面之該 第-接地點831 ;以及-第二饋入同轴傳輸線18，包含： 一第二中心導線181 ，連接至該第二輻射金屬臂之該第二 饋入點853 ;及一第二外層接地導體182，連接至該接地 面之該第二接地點832。本實施例8與實施例丨或實施例 7最大不同點，在於使用兩個天線單元，並各自具有一短 路金屬臂，其功效為降低此天線之隔離度，其餘皆與實施 >例1或實施例7大致相同。此外，該第一天線糾與該二二 天線85係由印刷或蝕刻技術形成於一微波基板妬上。 第9圖是本發明天線其他實施例8的反射係數π”、 Sr)及隔離度（sy量測結果；在實施例8中，為模擬筆圮 型電腦液晶螢幕（LCD)之支撐金屬背板環境，我們選擇該 接地面83其長度約為260 mm、寬度約為2〇〇 mm ;該第—天 線之該第一輻射金屬臂841其長度約為22 mm、寬度為2 mm，该第一天線之該苐一短路金屬臂842其長度約為6 12 1255588 mm、寬度為lmm ;該第二天線之該第二輻射金屬臂85i 其長度約為Umm、寬度為2mm ;該第二天線之該第二 短路金屬臂852其長度約為4mm、寬度為lmm。由所得實 驗結果’在_10dB反射係數的定義下，其第—共振模態或 較低操作頻帶91足以涵蓋2 4 GHz (24〇〇姻4麻）無線區域 網路頻帶，而在第二共振模態或較高操作頻帶犯足以涵蓋 5GHz(5150-5875 MHz)之無線區域網路頻;^，而纟隔離度％ 方面’兩模態之隔離度皆小於_2〇犯。 故 以上說明中所述之實施例僅為說明本發明之原理及其 ^，而非限制本發明。因此’習於此技術之人士可在^ 違背本發明之精神對上述實施例進行修改及變化。本發明 之權利範圍應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之結構圖。 第2圖為本發明天線一實施例之反射係數（§及 | 隔離度（S21)量測結果。 第3圖為本發明天線一實施例之輻射場型於頻率％幻 MHz之量測結果。 第4圖為本發明天線一實施例之輻射場型於頻率· MHz之量測結果。 第5圖為本發明天線—實施例之增益量測結果（較低操 作頻帶）。 第6圖為本發明天線—實施例之增益量測結果（較高操 13 1255588 ， 作頻帶）。 第7圖為本發明天線之其他實施例結構圖。 第8圖為本發明天線之其他實施例結構圖。 _ 第9圖為本發明天線其他實施例（第8圖結構）之反射 ^ 係數（Sn、S22)及隔離度（S21)量測結果。 【主要元件符號說明】 13 :接地面或筆記型電腦液晶螢幕（LCD)支撐金屬背板 131 :第一接地點 132 :第二接地點 ® 133 :短路點 14 :第一輻射金屬臂 141 :第一饋入點 15 :第二輻射金屬臂 151 :第二饋入點 16 :短路金屬臂 161 :第一短路金屬臂 ^ 162 :第二短路金屬臂 17 :第一饋入同軸傳輸線 171 :第一中心導線 172 :第一外層接地導體 18 :第二饋入同軸傳輸線 181 :第二中心導線 182 :第二外層接地導體 21 、91 :第一共振模態或較低操作頻帶（反射係數 14 '1255588Figure 2 is a reflection coefficient π", S22) and isolation (sy measurement result of an embodiment of the antenna of the present invention. In the embodiment i, the supporting metal of the analog notebook liquid crystal i (LCD) In the backplane environment, we select the ground plane 13 to have a length of about 26 mm and a width of about 2 〇〇; the first radiating metal arm 14 has a length of about 22 faces and a width of 2 faces; The metal arm 15 has a length of about llmm and a width of two sides; the first short-circuiting metal arm (6) of the short-circuited metal arm has a length of about 6 faces and a width of mm, and the second short-circuited metal arm of the short-circuited metal arm 162 has a length of about 2m: and a width of lmm. From the experimental results obtained, under the ambiguity of the lion reflection coefficient, its first resonant mode or lower operating band is sufficient to cover the 2.4 GHz (2400 GHz) wireless area network. The road band, while in the second ugly mode or higher operating band 22 (4) cover 5 post (5 traces ·) wireless = network band, and in isolation 23, the two modes are less than -15 dB. Fig. 3 and Fig. 4 are the antennas of the first embodiment of the present invention in the radiation of the 255588 step Wz and the antenna of the measuring hall. Type (4) fruit. The test results of the obtained examples, especially in the χ-Ζ plane "red (corruption straight face) and Xy _ plane (horizontal plane) measurement radiation field type, its natural performance main west t big green main pole The direction of the antenna is characterized by a misdirected polarization. Fig. 5 is an experimental result of the antenna gain of the antenna of the present invention in a lower operating band like GHz. The measurement results show that the lower fall frequency band The antenna gain is about 2·2~2.5dBi, which satisfies the operation requirements of the wireless local area network system. Fig. 6 is an experimental result of the antenna gain measurement in the higher operating band (5 GHz) of the antenna according to an embodiment of the present invention. The result of the measurement shows that the antenna gain of the lower operating band is about 2.5·3.0 dBi, which satisfies the operational requirements of the wireless local area network system. Fig. 7 is a structural diagram of another embodiment of the antenna of the present invention. A ground plane or a notebook computer liquid crystal display (LCD) 2 supports the metal moon plate 13 and has a shape substantially a rectangle, and has a first grounding point 131 and a second grounding point at one side of the grounding surface. 132 with a short circuit point 133; - first radiation a metal arm 74, located at the side of the ground plane 13, extends substantially along the side for generating a first (lower) operating frequency band of the antenna and having a first feed point 741; The second radiating metal arm is 'located at the side of the ground plane 13 and extends in a direction opposite to the first radiating metal arm 74 for generating a second (slower) operating frequency band of the antenna, and Having a second feed point 751; a shorted metal arm 16' is located at the side of the ground plane 13 and between the first radiating metal arm 74 and the second radiating metal arm 75, and includes a first short 1255588 'way metal arm 161 having one end connected to the first radiating metal arm 74 and the other end connected to the second radiating metal arm 75; and a second shorting metal arm • 丨 62 having one end substantially Vertically connected to the first short-circuiting metal arm 161 to form a T-shaped structure 'the other end is electrically connected to the grounding surface of the short-circuit point ^ 133; - the first feeding coaxial transmission line 17, comprising: a first-center conductor 171 Connected to the first feed point 74ι of the first radiating metal arm: And a first outer ground conductor 172 connected to the first ground point 131 of the ground plane; and a second feed coaxial transmission line 18, comprising: a second center conductor 181 connected to the second radiating metal The second feed point 751 of the arm; and the second outer ground conductor 182 are connected to the second ground point 132 of the ground plane. The seventh embodiment differs from the embodiment in that the first Korean metal arm 74 and the second light metal arm 75 have a bent end, which can be used to reduce the size of the antenna. The structure is substantially the same as that of the first embodiment. Further, the first Korean metal arm 74, the second radiating metal arm 75, and the short-circuit metal 6 are formed on a microwave substrate 76 by printing or (4) technology. • Figure 8 is a block diagram of another embodiment of the present g-month antenna. The yoke example 8 includes a grounding surface or a gift metal backing plate 83 of a notebook computer LCD screen (lcd), which is substantially rectangular in shape, and has a first-side at one side of the grounding surface. a location 831, a second grounding point, a first shorting point 833 and a second shorting point 834; a first antenna 84, located at the side of the ground plane, extending substantially along the side, and The method includes: - a: a radiating metal arm 841' for generating a first (lower) operating frequency band of the antenna, and having a first feed point 843; and a first short circuit 11 1255588 metal arm 842, the end Connected to the first-light metal arm 84i, the other end is electrically connected to the first short-circuit point (8) of the ground plane; a second antenna 85' is located at the side of the ground plane, and is oriented toward the first The antenna extends in opposite directions and includes: a second light metal arm 851 for generating a second (higher) operating frequency band of the antenna, and having a second feed point 853; and a second short metal An arm 852 having one end connected to the second light metal arm (5) and the other end electrically connected to the connection The second short-circuit point 834; the first feed-in coaxial transmission line 17, comprising: a first center-wire 171 connected to the first feed point of the first radiating metal arm; and - a - outer layer a grounding conductor 172 connected to the first grounding point 831 of the ground plane; and a second feeding coaxial transmission line 18, comprising: a second center conductor 181 connected to the second feed of the second radiating metal arm An entry point 853; and a second outer ground conductor 182 are coupled to the second ground point 832 of the ground plane. The eighth embodiment differs from the embodiment 丨 or the seventh embodiment in that two antenna units are used and each has a short-circuited metal arm, and the effect is to reduce the isolation of the antenna, and the rest are implemented with the example 1 or Example 7 is substantially the same. In addition, the first antenna correction and the two-two antenna 85 are formed on a microwave substrate by printing or etching techniques. Figure 9 is a reflection coefficient π", Sr) and isolation of the other embodiment 8 of the antenna of the present invention (sy measurement result; in Embodiment 8, a supporting metal back panel of a simulated pen-type computer liquid crystal display (LCD) Environment, we choose the ground plane 83 to have a length of about 260 mm and a width of about 2 mm; the first radiating metal arm 841 of the first antenna has a length of about 22 mm and a width of 2 mm. The short-circuited metal arm 842 of the antenna has a length of about 6 12 1255588 mm and a width of 1 mm; the second radiating metal arm 85i of the second antenna has a length of about Umm and a width of 2 mm; the second day The second shorting metal arm 852 of the wire has a length of about 4 mm and a width of 1 mm. From the experimental result 'under the definition of _10 dB reflection coefficient, its first resonant mode or lower operating band 91 is sufficient to cover 24 GHz. (24 4 4 )) wireless local area network band, and in the second resonant mode or higher operating band is enough to cover the wireless local area network frequency of 5GHz (5150-5875 MHz); ^, and 纟 isolation% Aspect 'the isolation of the two modes is less than _2 。. Therefore, the embodiment described in the above description is only The present invention is described in terms of the principles of the present invention, and is not intended to limit the scope of the invention. The invention may be modified and changed in accordance with the spirit of the invention. The scope of the invention should be applied as described below. [Brief Description] Fig. 1 is a structural diagram of an embodiment of an antenna according to the present invention. Fig. 2 is a reflection coefficient (§ and | isolation (S21) measurement result of an antenna according to an embodiment of the present invention. Fig. 3 is a measurement result of the radiation field type of the embodiment of the antenna of the present invention at a frequency % imaginary MHz. Fig. 4 is a measurement result of the radiation field type at a frequency of MHz according to an embodiment of the antenna of the present invention. The figure is the gain measurement result (lower operating band) of the antenna of the present invention. Fig. 6 is a gain measurement result of the antenna-embodiment of the present invention (higher operation 13 1255588, band). FIG. 8 is a structural diagram of another embodiment of an antenna according to the present invention. FIG. 9 is a reflection coefficient (Sn, S22) of another embodiment (structure of FIG. 8) of the antenna of the present invention. And isolation (S21) amount Result: [Main component symbol description] 13: Ground plane or notebook computer LCD screen (LCD) supporting metal back panel 131: first grounding point 132: second grounding point 133: shorting point 14: first radiating metal arm 141 : first feed point 15 : second radiating metal arm 151 : second feed point 16 : shorted metal arm 161 : first shorted metal arm ^ 162 : second shorted metal arm 17 : first fed coaxial transmission line 171 : First center conductor 172: first outer ground conductor 18: second feed coaxial transmission line 181: second center conductor 182: second outer ground conductor 21, 91: first resonant mode or lower operating band (reflection factor 14 '1255588
Sn量測結果） 22 、92 :第二共振模態或較高操作頻帶（反射係數 S22量測結果） 23 、93 :隔離度（S21量測結果） 74 :第一輻射金屬臂 741 :第一饋入點 75 :第二輻射金屬臂 751 :第二饋入點 76 :微波基板 83 :接地面或筆記型電腦液晶螢幕（LCD)支撐金屬背板 831 :第一接地點 832 :第二接地點 833 :第一短路點 834 :第二短路點 φ 84 :第一天線 841 :第一輻射金屬臂 842 ·•第一短路金屬臂 843 :第一饋入點 85 :第二天線 851 :第二輻射金屬臂 852 :第二短路金屬臂 853 :第二饋入點 15 1255588 86 :微波基板Sn measurement results) 22, 92: second resonance mode or higher operating frequency band (reflection coefficient S22 measurement result) 23, 93: isolation (S21 measurement result) 74: first radiation metal arm 741: first Feeding point 75: second radiating metal arm 751: second feeding point 76: microwave substrate 83: ground plane or notebook computer liquid crystal display (LCD) supporting metal backing plate 831: first grounding point 832: second grounding point 833: first short circuit point 834: second short circuit point φ 84: first antenna 841: first radiating metal arm 842 · first short metal arm 843: first feed point 85: second antenna 851: Two radiating metal arms 852: second shorting metal arm 853: second feeding point 15 1255588 86: microwave substrate