200952247 九、發明說明： 【發明所屬之技術領域】 纟發明係有關於-種多頻天線，特別是—種利用搞 合式饋入（___來增加操作頻寬之多頻無線通訊裝 置天線。 【先前技術】 ❹ 隨著無線通訊技術的蓬勃發展，無線網路（wirdess network)的應用越來越廣泛，而在筆記型電腦上的應用 除了傳統的無線區域網路（WLan)之外，更加入了 ^球 互通微波存取（WiMAX)、數位電視（DTV)以及行動通訊 (m〇bilecommimication)等多種應用。在這些無線通訊產品 應用中，天線的性能會影響通訊產品傳輸與接收信號品 質，為影響產品價值的重要關鍵之一。近年來由於行動 通訊系統的快速演進，從早期的GSM9〇〇/DCS雙頻操作 Ο 增加為現今的gsm850/9〇〇/dcs/pcs/umts多頻帶之操 作，以符合現今多頻通訊頻帶的需求。傳統倒F形天線 在有限的面積下，利用單一共振路徑在低頻若要達到 GSM850/900頻帶操作，是相當困難的挑戰，如台灣專利 公告號第1254,493號“一種雙頻倒ρ形天線，，，其揭示一 種利用筆記型電腦液晶螢幕支撐背板所内建的接地面， 在其接地面上設計倒F形天線達成雙頻操作的例子，該 天線設計在低頻只能涵蓋GSM900頻帶操作。而在一般 習知技術是外加寄生元件來增加頻寬，但會造成天線整 6 200952247 體體積的增加。 為了有效解決以上的問題’我們提出一種適用於筆 記型電腦的耦合式饋入多頻天線設計，其操作頻寬可涵 蓋 GSM850 ( 824 〜894 MHz )、GSM900 ( 890 〜960 MHz)、 DCS ( 1710 〜i880 mhz )、PCS ( 185〇 〜199〇 )及籠丁8 ( 1920〜2170 MHz)之通訊頻帶的需求。此設計是主要由一 雙共振路徑之單一天線藉由耦合式饋入機制取代傳統的 ❹直接饋入方式達成兩個共振頻帶的寬頻操作，其中低頻 頻帶主要是利用耦合式饋入之電容性降低天線整體之電 感性，再經由耦合式饋入與短路間適當的調整阻抗匹配 ，使得原先低頻之單一共振模態能多產生一個模態而達 成雙共振模態之效果以涵蓋GSM85〇/9〇〇頻帶操作，且天 線結構簡單，易於印刷或蝕刻在介質基板上，使得製作 成本低廉，同時也達到天線體積縮小化之功效，故本發 明天線適合内藏於筆記型電腦等其他無線通訊之系統内 部。 【發明内容】 如上所述，本發明之目的在於提供一種無線通訊裝 置天線其不僅可以涵蓋GSM850 / 900 / DCS / PCS / UMTS 頻帶之多頻操作’且結構簡單，易於印刷或㈣在介質 基板上，同時也達到天線體積縮小化之功效，相當適合 應用於筆記型電腦等無線裝置中。 7 200952247 本發明天線包括··-接地面，具有—短路點，且該 短路點位於該接地面之—側邊邊緣；及-輻射金屬元件 ，係以印刷或蝕刻技術形成，位於該支撐介質之單一表 面上’且該支揮介質位於該接地面之—邊緣附近，大致 平行朝外延伸，該輻射金屬元件並包含：輻射部.— 包含：―第—饋人部，具有—饋人點，該饋入 點為天線之饋入點’並連接至一訊號源；一第二饋入部 ，其-端連接至該輻射部’該第二饋入部與該第一饋入 具有—特定間距；及—短路部，其—端電氣連接 至該輻射部’另一端電氣連接至該接地面之短路點。 鲁 在本項發明天線中，該輻射部並包含一第一輻射部 及-第二輻射部，均共振在四分之—波長模態，其中該 第-輻射部所激發者為天線之第二操作頻帶，而該第二 ，射部所激發者為第-操作頻帶，利用耦合式饋入技術 來降低第i作頻帶（第二轄射部之时之—波長共振 模態）的實部阻抗值’並調整該第—饋人部與該第^饋 入部之尺寸來有效地增加電容性，以降低第—操作頻帶 丄第二輻射部之四分之—波長共振模態）之電感性，使 得該四分之一波長共振頻率點附近額外增加了天線輸入 阻抗之虛部零點，再藉由適當調整該短路部的尺寸，即 可達到良好之阻抗匹酉己，使得該輻射部於第一操作頻帶 達成雙共_態之效果，可涵蓋無線廣域網路（wwan) 所規定之GSM850 / 900 ( 824〜960 MHZ)之兩個頻段。同時 8 200952247 第二操作頻帶為該第—輻射部所激發之—寬頻模離，可 以涵蓋dCS/PCS/umts(簡〜217〇MHz)之三個頻 【實施方式】 第1圖為本發明天線實施例1之結構圖，包含：一 支撐；丨質11、接地面丨2，具有一短路點122，且該短 路點122位於該接地面之一側邊邊緣121丨一輻射金屬 70件13，係以印刷或蝕刻技術形成，位於該支撐介質之 ❼單-表面m上，且該支樓介質„位於該接地^ = 邊邊緣121料，大致平行朝外延伸，包含：一輻射部 14，包含：一第一輻射部142 ,具有至少一次彎折；一 第二輻射部143 ，具有至少一次彎折，並連接至該第一 輻射部142 ; —饋入部15，包含：一第一饋入部i5i ， 具有一饋入點152，該饋入點152為天線之饋入點，並 連接至一訊號源17; —第二饋入部153，其一端連接至 © 該輻射部14，該第二饋入部153與該第一饋入部151之 間具有一特定間距154 ;及一短路部16，其一端電氣連 接至該輻射部14，另一端電氣連接至該接地面之短路點 122 。 第2圖為本發明天線實施例丨的返回損失實驗量測 結果；在實施例1中，考慮筆記型電腦液晶螢幕内建之 接地面環境，我們選擇該接地面12之長度約為26〇 mm、 寬度約為200 mm ;而該輻射金屬元件13之長度約為59 mm、寬度約為nmm及厚度約為〇8mm，包含：一第 9 200952247 一輻射部142之長度約為31 mm (約為1900 MHz之四分之 \ 一波長）、寬度約為2.5 mm ; —第二輻射部143之長度 約為94 mm (約為900 MHz之四分之一波長）、寬度約為 2.5mm ;該饋入部15，包含：一第一饋入部151之長度 約為18 mm、寬度約為1 mm ; —第二饋入部153之長度 約為21 mm、寬度約為1 mm，該第二饋入部153與該第 一饋入部151之間具有一特定間距154約為0.3 mm ;該 短路部16之長度約為6 mm、寬度約為0.3 mm。由所得實 驗結果，在6dB返回損失的定義下，其第一操作頻帶21 約有158 MHz (802〜960 MHz)的操作頻寬，足以涵蓋無線 廣域網路（WWAN )之GSM850 / 900頻帶；而第二操作頻帶 22約有533 MHz( 1708〜2241 MHz)的操作頻寬，可同時涵 蓋DCS、PCS及UMTS三個頻帶，亦符合多頻應用需求 。另，該特定間距154可最寬到約3 mm，在調整其他饋 入部15之相關尺寸，亦可達到如第2圖近似之結果。 ❹ 第3圖、第4圖、第5圖、第6圖及第7圖為本發 明天線實施例1分別於859、925、1795、1920及2045 MHz之二維輻射場型圖，而其天線增益方面，在第一操 作頻帶21之增益大致為0〜1.0 dBi，在第二操作頻帶22之 天線增益大致為0.4〜2.7 dBi。由所得之結果，本發明天 線無論在低頻操作頻帶或高頻操作頻帶皆能符合實際無 線通訊產品之應用需求。 第8圖為本發明天線一其它實施例8結構圖。其中 200952247 具有至少一次彎折8〇1 ，使得該輻射部抖之 P伤區間與該接地面12大致垂直’可以藉此縮小天線之 體積，其他天線結構與實施例丨相似。本發明之實施例 8亦此達成與實施例丨相似之結果，符合無線通訊產品 的使用需求。 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 ❹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。 ❹ 200952247 【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量測結果。 ❹ 第3圖為本發明天線一實施例於859 MHz之輻射場型圖。 第4圖為本發明天線一實施例於925 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1920 MHZ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圖為本發明天線一其它實施例結構圖。 【主要元件符號說明】 1 :本發明天線一實施例 8 :本發明天線一其它實施例 U，81 :支撐介質 φ 111 :支撐介質基板之一單一表面 12 :接地面或筆記型電腦液晶螢幕（LCD)之支撐金 屬背板 .接地面之一侧邊邊緣 122 ••接地面之短路點 13.83 :輻射金屬元件 14.84 :輻射部 141,841 •輻射部之短路點 142, 842 :第—輻射部 12 200952247 143, 843 第二輕射部 144, 844 第一輻射部與第二輻射部之連接點 15, 85 饋入部 151，851 第一饋入部 152,852 第一饋入部之饋入點（天線之饋入點） 153, 853 第二饋入部 154, 854 第一饋入部與第二饋入部之特定間距 16 短路部 17 信號源 21 第一操作頻帶（返回損失S„量測結果） 22 第二操作頻帶（返回損失s„量測結果） 801 折彎 參 13200952247 Nine, invention description: [Technical field of invention] The invention relates to a multi-frequency antenna, in particular, a multi-frequency wireless communication device antenna that utilizes a combined feed (___ to increase the operating bandwidth). Prior Art] With the rapid development of wireless communication technology, the application of wireless network (wirdess network) is more and more widely, and the application on notebook computer is added in addition to the traditional wireless local area network (WLan). In the application of these wireless communication products, the performance of the antenna affects the quality of the transmission and reception signals of the communication products. One of the key factors affecting the value of products. In recent years, due to the rapid evolution of mobile communication systems, from the early GSM9〇〇/DCS dual-band operationΟ to the current gsm850/9〇〇/dcs/pcs/umts multi-band operation In order to meet the needs of today's multi-frequency communication band. The traditional inverted-F antenna uses a single resonant path at a low frequency to reach GSM850/900 under a limited area. Band operation is a very difficult challenge, such as Taiwan Patent Publication No. 1254, 493 "a dual-frequency inverted ρ-shaped antenna, which discloses a ground plane built into the back panel of a notebook computer LCD screen. An example of dual-frequency operation is designed on the ground plane to design an inverted F-shaped antenna. The antenna design can only cover the GSM900 band operation at low frequencies. However, in the conventional technology, parasitic components are added to increase the bandwidth, but the antenna will be integrated 6 200952247 In order to effectively solve the above problems, we propose a coupled feed multi-frequency antenna design for notebook computers, which can cover GSM850 (824 to 894 MHz) and GSM900 (890 to 960 MHz). ), DCS (1710 ~ i880 mhz), PCS (185〇~199〇) and Cage 8 (1920~2170 MHz) communication band requirements. This design is mainly by a single antenna of a pair of resonant paths by coupling The feed mechanism replaces the traditional ❹ direct feed mode to achieve broadband operation of two resonant frequency bands, wherein the low frequency band mainly uses the capacitive input of the coupled feed to reduce the overall antenna Inductive, and then properly adjusted impedance matching between the coupled feed and the short circuit, so that the original low frequency single resonant mode can generate a modality to achieve the dual resonance mode effect to cover the GSM85〇/9〇〇 band operation. The antenna has a simple structure and is easy to print or etch on the dielectric substrate, so that the manufacturing cost is low and the antenna is reduced in size. Therefore, the antenna of the present invention is suitable for being embedded in other wireless communication systems such as notebook computers. SUMMARY OF THE INVENTION As described above, it is an object of the present invention to provide a wireless communication device antenna that can cover not only multi-frequency operation of the GSM850 / 900 / DCS / PCS / UMTS band but also simple structure, easy printing or (4) on a dielectric substrate. At the same time, it also achieves the effect of reducing the size of the antenna, which is quite suitable for use in wireless devices such as notebook computers. 7 200952247 The antenna of the present invention comprises a ground plane having a short circuit point located at a side edge of the ground plane; and a radiation metal component formed by printing or etching techniques, located in the support medium a single surface 'and the branching medium is located near the edge of the ground plane, extending substantially parallel outwardly, the radiating metal component comprises: a radiating portion. - comprising: a - the first feeding portion, having a - feeding point, The feed point is a feed point of the antenna 'and is connected to a signal source; a second feed portion whose end is connected to the radiation portion', the second feed portion has a specific spacing from the first feed; a short-circuited portion, the terminal being electrically connected to the radiating portion and the other end being electrically connected to a short-circuit point of the ground plane. In the antenna of the present invention, the radiating portion further includes a first radiating portion and a second radiating portion, each of which resonates in a quarter-wavelength mode, wherein the first radiating portion excites the second antenna Operating the frequency band, and the second, the exciter of the shot is the first operating band, and the coupled feed technique is used to reduce the real impedance of the i-th frequency band (the time of the second ray-wavelength resonance mode) The value 'and adjusts the size of the first-feeder portion and the second feed portion to effectively increase the capacitance to reduce the inductivity of the first operating band 四 the second-wavelength-wavelength resonance mode of the second radiating portion, The imaginary zero point of the antenna input impedance is additionally increased near the quarter-wavelength resonance frequency point, and by appropriately adjusting the size of the short-circuit portion, a good impedance can be achieved, so that the radiation portion is first The operating band achieves the effect of a dual common state, covering the two bands of the GSM850 / 900 (824~960 MHZ) specified by the wireless wide area network (WWAN). At the same time 8 200952247 The second operating band is the broadband-modulated excitation of the first-radiation part, which can cover three frequencies of dCS/PCS/umts (simplified to 217〇MHz). [Embodiment] FIG. 1 is an antenna of the present invention. The structural diagram of Embodiment 1 includes: a support; a enamel 11, a ground plane 丨2, having a short-circuit point 122, and the short-circuit point 122 is located at one side edge 121 of the ground plane, and a radiating metal 70 member 13, Formed by printing or etching techniques, located on the single-surface m of the support medium, and the branch medium „located at the grounding edge=121, extending substantially parallel outwards, comprising: a radiating portion 14 comprising a first radiating portion 142 having at least one bend; a second radiating portion 143 having at least one bend and connected to the first radiating portion 142; the feeding portion 15 comprising: a first feeding portion i5i , having a feed point 152 which is a feed point of the antenna and connected to a signal source 17; a second feed portion 153 having one end connected to the radiation portion 14, the second feed portion 153 has a specific spacing 154 between the first feeding portion 151; a short-circuit portion 16 having one end electrically connected to the radiating portion 14 and the other end electrically connected to the short-circuit point 122 of the ground plane. FIG. 2 is an experimental result of the return loss of the antenna embodiment of the present invention; In consideration of the built-in ground plane environment of the notebook LCD screen, we select the ground plane 12 to have a length of about 26 mm and a width of about 200 mm; and the radiating metal component 13 has a length of about 59 mm and a width of about It is nmm and has a thickness of about 8 mm, including: a 9th 200952247. The length of a radiating portion 142 is about 31 mm (about a quarter of a wavelength of 1900 MHz), and the width is about 2.5 mm. The length of 143 is about 94 mm (about a quarter of a wavelength of 900 MHz) and the width is about 2.5 mm. The feeding portion 15 includes: a first feeding portion 151 having a length of about 18 mm and a width of about 1 The second feeding portion 153 has a length of about 21 mm and a width of about 1 mm, and the second feeding portion 153 and the first feeding portion 151 have a specific spacing 154 of about 0.3 mm; the short-circuit portion 16 The length is about 6 mm and the width is about 0.3 mm. The experimental results are obtained at 6 dB. Under the definition of return loss, its first operating band 21 has an operating bandwidth of approximately 158 MHz (802 to 960 MHz), which is sufficient to cover the GSM850/900 band of the wireless wide area network (WWAN); and the second operating band 22 has approximately 533. The operating bandwidth of MHz (1708~2241 MHz) can cover three frequency bands of DCS, PCS and UMTS, and it also meets the requirements of multi-frequency applications. Alternatively, the particular spacing 154 can be as wide as about 3 mm, and the associated dimensions of the other feeds 15 can be adjusted to achieve a similar result as in Figure 2. ❹ 3, 4, 5, 6 and 7 are two-dimensional radiation pattern diagrams of the antenna embodiment 1 of the present invention at 859, 925, 1795, 1920 and 2045 MHz, respectively, and the antenna thereof In terms of gain, the gain in the first operating band 21 is approximately 0 to 1.0 dBi, and the antenna gain in the second operating band 22 is approximately 0.4 to 2.7 dBi. As a result of the above, the antenna of the present invention can meet the application requirements of actual wireless communication products regardless of the low frequency operation band or the high frequency operation band. Figure 8 is a structural view of another embodiment 8 of the antenna of the present invention. Wherein 200952247 has at least one bend of 8〇1 such that the P-injured section of the radiating portion is substantially perpendicular to the ground plane 12, thereby reducing the volume of the antenna, and other antenna structures are similar to those of the embodiment. Embodiment 8 of the present invention also achieves similar results to the embodiment and conforms to the use requirements of the wireless communication product. The embodiments described in the above description are merely illustrative of the principles and functions 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 is set forth in the appended claims. ❹ 200952247 [Simplified description of the drawings] Fig. 1 is a structural view showing an embodiment of an antenna according to the present invention. Figure 2 is a graph showing the return loss measurement of an embodiment of the antenna of the present invention. ❹ Figure 3 is a radiation pattern diagram of an embodiment of the antenna of the present invention at 859 MHz. Figure 4 is a radiation pattern diagram of an embodiment of the antenna of the present invention at 925 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 1920 MHZ. Figure 7 is a radiation pattern diagram of an embodiment of the antenna of the present invention at 2045 MHz. Figure 8 is a structural view of another embodiment of the antenna of the present invention. [Main component symbol description] 1 : Antenna of the present invention - Embodiment 8: Antenna of the present invention - Other embodiment U, 81: Supporting medium φ 111: One single surface of the supporting dielectric substrate 12: Ground plane or notebook computer liquid crystal screen ( Supporting metal backing plate of LCD). One side edge of grounding surface 122 • Short-circuit point of grounding surface 13.83: radiating metal element 14.84: radiating part 141, 841 • short-circuit point 142 of radiating part, 842: first-radiation part 12 200952247 143 843 Second light-emitting portion 144, 844 Connection point 15 of the first radiation portion and the second radiation portion, 85 Feeding portion 151, 851 First feeding portion 152, 852 Feeding point of the first feeding portion (feeding point of the antenna) 153, 853 second feeding portion 154, 854 a specific distance between the first feeding portion and the second feeding portion 16 short circuit portion 17 signal source 21 first operating band (return loss S „ measurement result) 22 second operating band (return loss) s „Measurement result 801 Bend ginseng 13