有化學式時’請揭示最能顯示發明特徵的化 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種單極天線，特別是一種多頻單極天 線。 【先前技術】 、近年來k著無線通訊技術的蓬勃發I ,相冑應的無線 通訊產也隨之出現，筆記型電腦結合無線通訊網路即是 相當普遍的應用。以往的筆記型電腦多以無線區域網路 (WL>W) Α主’然而為了滿足現今更多無線通訊功能的應 用，筆s己型電腦之天線勢必朝向多頻化之趨勢，如無線廣 域網路（WWAN)等無線應用。傳統筆記型電腦的天線多以 雙頻倒F形天線為主，且天線體積較大。倘若要在有限的 筆記型電腦内部空間以傳統倒F形天線來達成多頻操作， 疋具有相當尚的挑戰性。如台灣專利公告號第1261952號 雙頻倒F形天線”，其揭示一種利用雙支路的方式來達 成雙頻操作，其阻抗頻寬相當有限，且天線結構也不適合 未來多頻化之應用。 有別於傳統倒F形天線，本發明提出一種適用於行動 通訊裝置之多頻單極天線設計，其操作頻帶範圍可同時涵 蓋GSM850/900/1800/1900/UMTS之WWAN五頻操作。本天線設 1378602 計係由^合短料極天線及—直接饋人單極天線所組成 。該輕合短路單極天線（物理長度約為第—（較低）模態 之四分之-波長）係以-輕合部作為饋入，電氣連接至該 直接饋入單極天線，而該耦合部之功用在於降低天線實部 輸入阻抗值及降低虛部輸入阻抗之電抗值，經由適當調整 輕合部尺寸與短路點位置，可使得原先低頻僅單一共振模 態月匕多產生-個共振模態而達成雙共振模態之效果，使其 可涵蓋GSM85_〇之雙頻操作。該直接饋入之單極天線之 物理長度約為第二操作頻帶之四分之一波長，其產生之操 作頻寬可涵蓋GSMm)0/l900/UMTSu頻祕。因此本天線 設計即可符合WWAN所需之五頻操作，同時天線結構容易 印刷或钱刻於介質基板上，使得製作成本低廉，故本發明 天線相當符合現今行動通訊裝置的需求。 【發明内容】 —本發明之目的在於提出一種多頻單極天線設計，其可 驗涵蓋WWAN之五頻操作。 -本發明天線包含：—接地面、—介f基板及_金屬輕 射元件該介質基板位於該接地面之一邊緣處，並大致與 該接地面平行向外延伸。該金屬輻射元件係以蝕刻或印刷 ，術形成於該介質基板之一表面上，並包含：一第一轄射 P 短路。卩、一第一輻射部及一輕合部。該第一輻射部 ^有一短路點。該短路部，其一端電氣連接至該第一輻射 π之該紐路點，另一端則電氣連接至該接地面。該第二輻 1378602 長：：1 ，合部18，包含：一第-輕合部⑻ ϋ約為！4腿、寬度約為〇.5mm ; 一第二轉合部182 ; ;、=約為Mmm、寬度約為〇.5麵’該第二輕合部 82與該第—麵合部⑻之間具有—搞合間距⑻，_ 己間距⑻約為u)mm。由實驗量測結果可知在⑽返 =失定義下，本發明天線於第一（較低）操作頻帶心 涵益G_/900之兩個操作頻帶，第二操作頻扣可涵蓋 咖_/1900鍾8之三個操作頻帶，因此本發明天線適合 一般無線廣域網路（WWAN)之應用。 第3圖為本發明之第一其它實施例3結構圖，其中該 第一輻射部34及該短路部35與該第二輻射部16及該耦合部 38位於該介質基板12之不同表面上，其它天線結構與實施 例1相似。實施例3亦能獲得與實施例1近似的結果。 第4圖為本發明之第二其它實施例4結構圖，其中該 •第一耦合部481與該第二耦合部182相互平行。其它天線 、结構與實施例1相似。實施例4亦能獲得與實施例i近似 的結果。 以上說明中所述之實施例僅為說明本發明之原理及其 功效’而非限制本發明。因此’習於此技術之人士可在不 違貪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。 1378602 【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實測返回損失圖。 第3圖為本發明天線第一其他實施例結構圖。 第4圖為本發明天線第二其他實施例結構圖。 【主要元件符號說明】When there is a chemical formula, please disclose the best indication of the characteristics of the invention. 9. Description of the Invention: [Technical Field of the Invention] The present invention relates to a monopole antenna, particularly a multi-frequency monopole antenna. [Prior Art] In recent years, the wireless communication technology has been booming, and the wireless communication products have appeared. The combination of a notebook computer and a wireless communication network is a fairly common application. In the past, most notebook computers used wireless local area network (WL>W). However, in order to meet the application of more wireless communication functions today, the antenna of the pen-type computer is bound to face the trend of multi-frequency, such as wireless wide area network. Wireless applications such as (WWAN). The antenna of the traditional notebook computer is mainly composed of a dual-frequency inverted F-shaped antenna, and the antenna has a large volume. If you want to achieve multi-frequency operation with a traditional inverted-F antenna in the limited internal space of the notebook, you are quite challenging. For example, Taiwan Patent Publication No. 1261952 double-frequency inverted F-shaped antenna, which discloses a dual-branch approach to achieve dual-frequency operation, the impedance bandwidth is rather limited, and the antenna structure is not suitable for future multi-frequency applications. Different from the traditional inverted-F antenna, the present invention proposes a multi-frequency monopole antenna design suitable for mobile communication devices, and the operating frequency band range can cover the WWAN five-frequency operation of GSM850/900/1800/1900/UMTS. The 1378602 system consists of a short-pole antenna and a direct-feed monopole antenna. The light-short-circuited monopole antenna (physical length is approximately the fourth-lower-mode wavelength of the first (lower) mode) The light-emitting portion is fed as a feed, electrically connected to the direct-feeding monopole antenna, and the function of the coupling portion is to reduce the input impedance value of the real part of the antenna and reduce the reactance value of the input impedance of the imaginary part, and appropriately adjust the light-closing part. The size and the position of the short-circuit point can make the original low-frequency only a single resonant mode, and the resonant mode can generate a double resonance mode, so that it can cover the dual-frequency operation of GSM85_〇. The physical length of the monopole antenna is about a quarter of the wavelength of the second operating band, and the operating bandwidth generated can cover GSMm) 0/l900/UMTSu frequency. Therefore, the antenna design can meet the requirements of the WWAN. The multi-frequency monopole is proposed in the present invention. The antenna design can cover the five-frequency operation of the WWAN. The antenna of the present invention comprises: a ground plane, a f-substrate, and a metal light-emitting element. The dielectric substrate is located at one edge of the ground plane, and is substantially connected to the antenna The ground radiating element extends parallel to the surface. The metal radiating element is formed on one surface of the dielectric substrate by etching or printing, and comprises: a first conditioned P short circuit, a first radiating portion and a light merging portion. The first radiating portion has a short-circuit point, and the short-circuit portion has one end electrically connected to the new way point of the first radiation π, and the other end is electrically connected to the ground plane. The second spoke 137860 2 Length::1, joint 18, including: a first-light joint (8) ϋ about! 4 legs, width is about 〇.5mm; a second turning part 182; ;, = about Mmm, width about The surface of the second light fitting portion 82 and the first surface joint portion (8) has a spacing (8), and the spacing (8) is about u) mm. It is known from the experimental measurement results that (10) is returned. Under the definition, the antenna of the present invention is in the two operating frequency bands of the first (lower) operating band, and the second operating frequency band can cover three operating bands of the coffee/1900 clock 8, so the present invention The antenna is suitable for a general wireless wide area network (WWAN) application. Fig. 3 is a structural diagram of the first other embodiment 3 of the present invention, wherein the first radiating portion 34 and the shorting portion 35 and the second radiating portion 16 and the coupling The portions 38 are located on different surfaces of the dielectric substrate 12, and other antenna structures are similar to those of the first embodiment. The result similar to that of Example 1 can also be obtained in Example 3. Figure 4 is a structural view of a second other embodiment 4 of the present invention, wherein the first coupling portion 481 and the second coupling portion 182 are parallel to each other. Other antennas and structures are similar to those of the first embodiment. The results similar to those of the example i can also be obtained in the fourth embodiment. The embodiments described in the above description are merely illustrative of the principles of the invention and the <RTIgt; 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 should be as set forth in the appended claims. 1378602 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 measured return loss of an embodiment of the antenna of the present invention. Figure 3 is a block diagram showing the first 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 3 4 11 111 112 121 3 4 11 111 112 12
121 13,33,43 14, 34, 44 141,341,441 15,35 16 161 17 18,38, 48 本發明天線一實施例 本發明天線第一其他實施例 本發明天線第二其他實施例 接地面或筆記型電腦之支撐金屬背板或行動 通訊裝置之系統接地面 接地面之一邊緣 接地點 介質基板 介質基板之一表面 金屬輻射元件 第一輪射部 短路點 短路部 第二輕射部 天線饋入點 訊號源 耦合部 1378602121 13,33,43 14,34,44 141,341,441 15,35 16 161 17 18,38, 48 antenna of the invention one embodiment of the antenna of the invention, second embodiment of the antenna of the invention, grounding surface or notebook type Computer supporting metal backplane or mobile communication device system grounding surface one of the grounding surfaces edge grounding point dielectric substrate dielectric substrate one surface metal radiating element first rounding part short-circuit point short-circuiting part second light-emitting part antenna feeding point signal source Coupling part 1378602
181,381,481 :第一耦合部 182 :第二耦合部 183, 383, 483 :耦合間距 21 :第一（較低）操作頻帶 22 :第二操作頻帶 11181, 381, 481: first coupling portion 182: second coupling portion 183, 383, 483: coupling pitch 21: first (lower) operating band 22: second operating band 11