1343675 /九、發明說明： • '【發明所屬之技術領域】 本發明係關於一種天線，尤其是有關於一種適合内藏 於手機之多頻天線。 【先前技術】 由於廣域無線網路（WWAN，Wireless Wide Area Network)技 術的蓬勃發展，今日人們已能夠透過手機裝置隨時隨地的 $與想要聯繫的人進行通話。然而由於全球不同國家常採用 不同的廣域無線網路系統來傳遞訊號，因此全球存在著多 種廣域無線網路通訊標準，如全球行動通訊系統（Global System for Mobile Communication,美規 GSM850, 824 ~ 894 MHz &11〇1歐規05]^900,880〜9601^2)、數位通訊系統(DCS， Digital Communication System, 1710 〜1880 MHz)個人通訊服務系 統（PCS, Personal Communication System, 1850 ~ 1990 MHz)及通用 移動通訊系統(UMTS，Universal Mobile Telecommunications System， • 1920〜2170 MHz)等。所以使用者往往必須因為國家或地域 的不同而更換不同手機，這使得手機使用的便利性受到了 相當大限制。 所以為了要讓手機可在不同的國家或地域使用，手機 同時具備多種廣域無線網路系統操作功能已成為必然之趨 勢，然而若要在單一手機内配置多天線系統，其必須克服 電磁干擾以及高天線製作成本等問題。因此若能設法設計 出具有同時涵蓋多個操作頻帶特性之單一天線實為較佳之 5 1343675 •問題解決方案。先前相關美國專利第6,727,854號“平面倒 F形天線（P1謙inverted-F antenna) ” ’其揭示一種可雙頻 作之手機天線設計，該天線僅能達成涵蓋歐規gsm_系 統以及DCS系統之頻寬需求，且該天線結構較為複雜。而 台灣發明專利號第1222769號”可雙頻操作之低姿式單偶極 天線”，其揭示-種可雙頻操作之手機天線，該天線雖然 結構較為簡單，但其也僅能涵蓋GSM系統以及D 統之操作頻帶。為了解決此一問題，我們提出一種創新的 多頻天線設計，本發明天線不僅結構簡單、製作成本低， 且可以同時涵蓋GSM850/GSM900、DCS、pcs以及υΜτ§ 行動通訊系統操作之頻寬需求’相當符合實際手機系統之 應用需求。 【發明内容】 如上所述，本料之目的在純供—财财機天線 的創新設計’不僅可以達成多頻的操作需求，同時本發明 天線結構簡單、製作成本低，相當適合應用於手機裝置。 本發明天線包含：一介質基板、一接地面以及-輻射 部。其中該介質基板為一行動通訊裝置之系統電路板，而 該接地面位於該介質基板上，並具㈣短路點，該兩短路 點大致位於該接地面之—邊緣處，且該接地面係以印刷或 ㈣之方式形成於該介質基板上。而該㈣部，包含：一 支撐介質、-輻射金屬線、以及—單極天線。該輻射金屬 6 1343675 線位於錢撐介質上’其㈣點分別電氣連接於該接地面 之兩短路點’使得純射金屬線與該接地面之— 一封閉區間。而該單極天線亦位於該支撐介質上，並' 輕射金屬線所圍繞，該單極天線共振於四分之一波長= ，並耦合激發該輻射金屬線，且該單極天線之一端為=二 饋入點，而該訊號饋入點位於該輻射金屬線之兩端點^間 0 • 在本項發明中，天線可產生一天線共振模態與一單極 天線共振模態。其中該天線共振模態主要是由該單極天線 所耦合激發，而該單極天線共振模態則是為該單極天線所 產生的共振模態。由於該單極天線除了可當作耦合的饋入 元件外，同時也能夠額外產生該單極天線共振模態，所以 本發明天線可以輕易的達到多頻操作。從實驗結果顯示， 本發明之一實施例1能同時涵蓋行動通訊系統GSM850/900 B 、DCS、PCS與UMTS之系統頻寬需求，且在操作頻帶内 之返回損失皆有高於6 dB的表現，所以相當符合行動無線 通訊之實際應用需求。 兹配合下列圖式、實施例之詳細說明及申請專利範圍 ’將上述及本發明之其他目的與優點詳述於後。 【實施方式】 第1圖為本發明天線主要實施例1結構圖。本發明天 線主要實施例1包含：一介質基板10、一接地面11以及一 7 1343675 心 丨為基板10為-行動通訊裝置之李统電 -路板，而該接地面丨丨位於該介曾其柘μ ^您糸，·死電 點川 m 於心質基板10上’並具有兩短路 兩短路點U1、112大致位於該接地面 之-邊緣處U3，且該接地面n係以印刷或蝕刻之方式形 成於该介質基板10上，同時該接地㈣經由 14連接至一今篇H n工—^ ^ ^ 金屬片13,而该金屬片13為-折疊式行動通訊 裝置上盍之支撐金屬背板。該輻射部丨2，包含：一 質⑵、一輻射金屬線、以及一單極天線⑵ =121係為一介質塊，且其為玻纖基板所形成。該輻 射金屬線122位於該支撐介質121上，其兩端點123、 124則分別電氣連接於該接地面之兩短路點iu、ιΐ2， 使得該輻射金屬線122與該接地面之一邊緣ιΐ3形成一封 閉區間。此外，該輻射金屬線122具有複數次彎折使其所 佔尺寸減小，且該輻射金屬線122靠近中間部分的金屬寬 度大於該輕射金屬線靠近兩端部分的金屬寬度，有助於降 低該轄射金屬、線122所產生之共振模態之頻率。而該單極 天線125亦位於該支撐介質121上，其形狀大致為一丁字 =1為該輻射金屬線122所圍繞，其共振於四分之一波長 ^態，並耦合激發該輻射金屬線122 ，且該單極天線之一 端I26為汛號饋入點，而該訊號饋入點位於該輻射金屬線 之兩端點123 、124之間。 第3圖為第一圖實施例丨的返回損失實驗量測結果。 本實驗選擇下列尺寸進行量測：該接地面11長度為90mm 8 5675 .、寬度為45mm ;該支撐基板ι21所佔的體積約為6以〇 45mm3 ;該輻射金屬線122靠近中間部分的金屬寬度為$ mm，該輻射金屬線靠近兩端部分的金 ^又… 两見及馬0·5 mm， 且該幸I射金1線122總長度約為135_，而該㈣ 之兩端點與訊號饋入點之距離為0.5mm ;該單極天線 之總長度約為34 mm、寬度為4.5 mm。如坌3固& 划弟·3圖所示，實 施例1可產生天線共振模態301 、3〇2、 JUj ，其中該丘 振模態303為該單極天線125所產生之八—、Μ 〇 〜w刀之—波長模態 。該共振模態301 、302、303形成一护眘4S认上 y取超寬頻的操作頻寬 ，可同時涵蓋行動通訊系統GSM850/900、Des、p UMTS之系統頻寬需求，且本天線在需求頻帶内之返^損 失皆有高於6dB的表現’符合多頻應用需求。在本項發^ 中，由於該單極天線125除了可當作耗合的饋人元件^卜， 同時也能夠額外產生該單極天線共振模態3〇3 ，所以本發 明天線可以輕易的達到多頻操作。 x 第4圖為實施例i於89〇MHz之轄射場型圖。由所得 之結果’天線較低操作頻帶之輻射場型與傳統内藏式平板 天線共振於同一頻率時的輻射場型相似。第5圖、第6圖 及第7圖為實施例1於m5MHz、192GMHz和細廠之 輻射場型圖。由所得之結果可知，天線較高操作頻帶内不 同頻率之輻射場型皆相當類似，並適合於行動通訊裝置之 應用。 第 圖為實施例1之增益圖。由所得之結果， 在 1343675 / GSM850/900頻帶内，天線增益大致從0.1 dBi變化到2.4 dBi ;在DCS/PCS/UMTS頻帶内，天線增益大致從2.2 dBi變化到 4.0dBi 〇不論是較低操作頻帶或是較高操作頻帶，操作頻 帶内天線增益都相當穩定，符合實際手機系統之應用需求 第9圖及第10圖分別為本發明天線第一其他實施例2 及第二其他實施例3結構圖。實施例2與實施例1的整體 鲁結構大致相同，唯接地面21並無連接金屬片13及連結金屬 線14。而實施例3亦與實施例1之整體結構大致相同，僅 實施例3之單極天線325為一倒L形結構。上述這兩種其 他實施例，皆可達成與實施例1相似之多頻操作特性。 綜合上述的說明，本發明天線的結構簡單，製作成本 低’功能明確’因此本發明天線甚具高度產業應用價值， 足以符合發明之範疇。 ® 惟’以上所述者，僅為本發明之較佳實施例而已，去 不能以此限定本發明實施之範圍。即大凡依本發明申請專 利範圍所作之均等變化與修飾，皆應仍屬本發明專: 之範圍内。 【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輻射部之平面展開圖。 第3圖為本發明天線一實施例之返回損失量測結果。 1343675 第4圖為本發明天線一實施例於890 MHz之輻射場型圖。 第5圖為本發明天線一實施例於1795 mhz之輻射場型圖。 第6圖為本發明天線一實施例於ι92〇 之輻射場型圖。 第7圖為本發明天線一實施例於2045 MHz之輻射場型圖。 第8圖為本發明天線一實施例之增益圖。 第9圖為本發明天線第一其他實施例結構圖。 第10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】 1 • « 本發明天 線一實施例 2 本發明天 線第一其他實施例 3 本發明天 線第二其他實施例 10 介質基板 11、 21 :接地面 111 、 112 、 2Π 、212 ： 113 > 213 ： 接地面之一邊緣 12、 32 :輻射部 121 、 321 ： 支撐介質 122 322 ： 輻射金屬線 123 124 、 323 、 324 ： 125 、 325 ： 單極天線 126 > 326 ： 單極天線之一端（ :輻射金屬線之端點 背板 1343675 14 :連結金屬線 301 、 302 :天線共振模態 303 :天線共振模態，並為單極天線共振模態1343675 / IX. Description of the invention: • 'Technical field to which the invention pertains» The present invention relates to an antenna, and more particularly to a multi-frequency antenna suitable for being incorporated in a mobile phone. [Prior Art] Due to the rapid development of Wide Area Wireless Network (WWAN) technology, today people have been able to talk to people who want to contact anytime, anywhere via a mobile device. However, because different countries in the world often use different wide-area wireless network systems to transmit signals, there are many wide-area wireless network communication standards, such as Global System for Mobile Communication (US GSM850, 824 ~). 894 MHz &11〇1 European Regulations 05]^900,880~9601^2), Digital Communication System (DCS, Digital Communication System, 1710 to 1880 MHz) Personal Communication System (PCS, Personal Communication System, 1850 ~ 1990 MHz) And Universal Mobile Telecommunications System (UMTS, Universal Mobile Telecommunications System, • 1920~2170 MHz). Therefore, users often have to change different mobile phones because of different countries or regions, which makes the convenience of using mobile phones considerably limited. Therefore, in order to make the mobile phone available in different countries or regions, it is inevitable that the mobile phone has multiple wide-area wireless network system operation functions. However, if a multi-antenna system is to be configured in a single mobile phone, it must overcome electromagnetic interference and High antenna production costs and other issues. Therefore, it would be better to try to design a single antenna with multiple operating band characteristics. 5 1343675 • Problem Solution. Previously related to U.S. Patent No. 6,727,854, "P1 inverted-F antenna", which discloses a dual-frequency mobile phone antenna design that can only meet the European standard gsm_ system and DCS system. The bandwidth is required, and the antenna structure is relatively complicated. Taiwan Patent No. 1222769 "Low-frequency single-dipole antenna with dual-frequency operation" discloses a dual-frequency mobile phone antenna. Although the antenna structure is relatively simple, it can only cover the GSM system. And the operating band of the D system. In order to solve this problem, we propose an innovative multi-frequency antenna design. The antenna of the present invention is not only simple in structure, low in production cost, but also covers the bandwidth requirements of GSM850/GSM900, DCS, pcs, and υΜτ§ mobile communication system operation. It is quite in line with the application needs of the actual mobile phone system. SUMMARY OF THE INVENTION As described above, the objective of the present invention is that the innovative design of the pure supply-finance antenna can not only achieve multi-frequency operation requirements, but also has the advantages of simple antenna structure and low production cost, and is quite suitable for use in mobile phone devices. . The antenna of the present invention comprises: a dielectric substrate, a ground plane, and a radiation portion. The dielectric substrate is a system circuit board of a mobile communication device, and the ground plane is located on the dielectric substrate, and has a (four) short circuit point, the two short circuit points are substantially located at an edge of the ground plane, and the ground plane is Printing or (4) is formed on the dielectric substrate. And the part (4) includes: a supporting medium, a radiating metal wire, and a monopole antenna. The radiant metal 6 1343675 line is located on the support medium, and the (four) points are electrically connected to the two short-circuit points of the ground plane, respectively, such that the pure metal line and the ground plane are in a closed interval. The monopole antenna is also located on the supporting medium and surrounded by a light-emitting metal wire that resonates at a quarter wavelength = and is coupled to excite the radiating metal line, and one end of the monopole antenna is = two feed points, and the signal feed point is located between the two ends of the radiation metal line. In the present invention, the antenna can generate an antenna resonance mode and a monopole antenna resonance mode. The antenna resonant mode is mainly excited by the monopole antenna, and the monopole antenna resonant mode is a resonant mode generated by the monopole antenna. Since the monopole antenna can be used as a coupled feed element and can additionally generate the monopole antenna resonance mode, the antenna of the present invention can easily achieve multi-frequency operation. The experimental results show that one embodiment 1 of the present invention can cover the system bandwidth requirements of the mobile communication systems GSM850/900 B, DCS, PCS and UMTS, and the return loss in the operating band is higher than 6 dB. Therefore, it is quite in line with the practical application requirements of mobile wireless communication. The above and other objects and advantages of the present invention will be described in detail in the following description of the appended claims. [Embodiment] FIG. 1 is a structural view showing a main embodiment 1 of an antenna according to the present invention. The main embodiment 1 of the antenna of the present invention comprises: a dielectric substrate 10, a ground plane 11 and a 7 1343675 enamel for the substrate 10 as a mobile communication device, and the ground plane is located at the interface.柘μ ^ you 糸, · dead battery point on the core substrate 10 ' and has two short circuits, two short circuit points U1, 112 are located substantially at the edge - edge of the ground plane U3, and the ground plane n is printed or An etching method is formed on the dielectric substrate 10, and the grounding (four) is connected to a metal piece 13 via a 14th, and the metal piece 13 is a supporting metal on the folding mobile communication device. Backboard. The radiating portion 丨2 comprises: a mass (2), a radiating metal wire, and a monopole antenna (2) = 121 is a dielectric block, and is formed by a glass fiber substrate. The radiant metal line 122 is located on the support medium 121, and the two ends 123, 124 are electrically connected to the two short-circuit points iu, ι2 of the ground plane, respectively, so that the radiant metal line 122 forms an edge ιΐ3 with the ground plane. A closed interval. In addition, the radiant metal wire 122 has a plurality of bends to reduce the size thereof, and the metal width of the radiant metal wire 122 near the intermediate portion is greater than the metal width of the light-emitting metal wire near the two end portions, which helps to reduce The frequency of the resonant mode produced by the metal and line 122 is conditioned. The monopole antenna 125 is also located on the supporting medium 121, and has a shape of substantially a T-type = 1 surrounded by the radiating metal line 122, which is resonant in a quarter-wave state and coupled to excite the radiating metal line 122. And one end of the monopole antenna I26 is an apostrophe feed point, and the signal feed point is located between the two ends 123, 124 of the radiant metal line. Figure 3 is a graph showing the return loss experimental measurement of the first embodiment. The experiment selects the following dimensions for measurement: the ground plane 11 has a length of 90 mm 8 5675 . and a width of 45 mm; the support substrate ι 21 occupies a volume of about 6 〇 45 mm 3 ; the radiant metal line 122 is close to the metal width of the middle portion. For $ mm, the radiant metal wire is close to the gold of the two ends, and the two are seen and the horse is 0·5 mm, and the total length of the lucky I-ray gold 1 line 122 is about 135_, and the ends of the (four) point and the signal The feed point distance is 0.5 mm; the monopole antenna has a total length of approximately 34 mm and a width of 4.5 mm. As shown in FIG. 3, the embodiment 1 can generate antenna resonance modes 301, 3〇2, JUj, wherein the mode 303 is the 八, Μ 产生 generated by the monopole antenna 125. ~w knife - wavelength mode. The resonant modes 301, 302, and 303 form a PSD 4S that recognizes the operating bandwidth of the ultra-wideband, and can cover the system bandwidth requirements of the mobile communication systems GSM850/900, Des, and p UMTS, and the antenna is in demand. The return loss in the frequency band has a performance higher than 6dB' in line with the requirements of multi-frequency applications. In the present invention, since the monopole antenna 125 can be used as a consumable feeding component, and the monopole antenna resonant mode 3〇3 can be additionally generated, the antenna of the present invention can be easily achieved. Multi-frequency operation. x Figure 4 is a plot of the field pattern of the embodiment i at 89 〇 MHz. From the results obtained, the radiation field pattern of the lower operating band of the antenna is similar to the radiation pattern of the conventional built-in panel antenna at the same frequency. Fig. 5, Fig. 6, and Fig. 7 are radiation pattern diagrams of Example 1 at m5 MHz, 192 GMHz, and fine plants. It can be seen from the results that the radiation patterns of different frequencies in the higher operating frequency band of the antenna are quite similar and suitable for the application of mobile communication devices. The figure is the gain map of the first embodiment. As a result, the antenna gain varies from approximately 0.1 dBi to 2.4 dBi in the 1343675 / GSM850/900 band; in the DCS/PCS/UMTS band, the antenna gain varies approximately from 2.2 dBi to 4.0 dBi, regardless of lower operation. In the frequency band or the higher operating frequency band, the antenna gain in the operating band is relatively stable, which is in line with the application requirements of the actual mobile phone system. FIG. 9 and FIG. 10 are respectively the structure of the first other embodiment 2 and the second other embodiment 3 of the antenna of the present invention. Figure. The second embodiment is substantially the same as the overall Lu structure of the first embodiment, and only the metal piece 13 and the connecting metal wire 14 are not connected to the ground plane 21. The third embodiment is also substantially the same as the overall structure of the first embodiment. Only the monopole antenna 325 of the third embodiment has an inverted L-shaped structure. Both of the above-described other embodiments can achieve multi-frequency operation characteristics similar to those of the first embodiment. In view of the above description, the antenna of the present invention has a simple structure and a low manufacturing cost, and the function is clear. Therefore, the antenna of the present invention has a high industrial application value and is sufficient for the scope of the invention. The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the equivalent changes and modifications made by the invention in accordance with the scope of the invention are still within the scope of the invention. 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 plan development view showing a radiation portion of an embodiment of the antenna of the present invention. Figure 3 is a graph showing the return loss measurement of an embodiment of the antenna of the present invention. 1343675 Figure 4 is a radiation pattern diagram of an embodiment of the antenna of the present invention at 890 MHz. Fig. 5 is a radiation pattern diagram of an embodiment of the antenna of the present invention at 1795 mhz. Figure 6 is a radiation pattern diagram of an embodiment of the antenna of the present invention at ι 92 。. Figure 7 is a radiation pattern diagram of an embodiment of the antenna of the present invention at 2045 MHz. Figure 8 is a diagram showing the gain of an embodiment of the antenna of the present invention. Figure 9 is a structural view showing the first embodiment of the antenna of the present invention. Figure 10 is a structural view showing a second embodiment of the antenna of the present invention. [Main element symbol description] 1 • «The antenna of the present invention is an embodiment 2 The antenna of the present invention is the first other embodiment 3 The second embodiment of the antenna of the present invention 10 The dielectric substrate 11, 21: the ground planes 111, 112, 2Π, 212: 113 > 213 : one edge of the ground plane 12, 32: radiating portion 121, 321 : supporting medium 122 322 : radiating metal line 123 124 , 323 , 324 : 125 , 325 : monopole antenna 126 > 326 : monopole antenna One end (: end of the radiating metal wire backing plate 1343675 14: connecting metal wire 301, 302: antenna resonant mode 303: antenna resonant mode, and is a monopole antenna resonant mode
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