200937743 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種槽孔天線 頻單極槽孔天線，適合應❹行料訊=上種具有多 【先前技術】 ❹ ❹ 奴著無線通訊技術與市場的快速發展 多的無線通訊產品及技術，這些無線通訊產品中出= 的性能為影響通訊產品傳輸與接收信號品㈣ : ,1 匕之外，在講求輕、薄、短、小的趨勢潮流下= 、‘的问度將影響一個產品的價值，而此類具 ==訊產品中又大多以平板天線為主。在這= 手持式订動通訊裝置中，平板天線之高度大約需要h mm再加上機殼及其他相關元件，往往使得手持式 行動通訊裝置整體的厚度不易低於10 mm以下。將這類 天線設計應用到薄形的手持式行動裝置，如薄形手機（、 :手機f度l〇mm左右或更小），將會面臨天線高度過 的門而無法迎合手機薄形化的趨勢。因此，具有 平面印刷式特性的天線設計將可提供—種適合應用於薄 型動通訊裝置的可能，而印刷槽孔天線即為其中一 ，設計。美國專利申請公開第US2005 0116870 A1號“一種 單極槽孔天線（MonoP〇le Slot Antenna)”，其揭示一種四分之 一波長共振的内藏式單極槽孔天線設計。此類單極槽孔 天線所萬的尺寸較傳統二分之一波長共振之槽孔天線小 5 200937743 ，同時具有較大的操作頻寬。但其單極槽孔採用在槽孔 開路端邊緣饋入之方式，會造成天線不易達成多頻頻段 _ 的操作。 為了有效解決以上的問題，我們提出一種具有多頻 操作之單極槽孔天線，採用饋線在單極槽孔的t間位置 附近饋入，並籍由將饋線彎折使其終端跨過單極槽孔兩 次，在不同的位置調整激發高階模態的等效磁流分布， ©讓操作頻帶内形成多模態共振的特性，形成寬頻的操作 頻寬來涵蓋〇8厘850/900(824〜894]^1^/890〜960^&^)與 DCS/PCS/UMTS ( 1710 〜1880 MHz/ 1850 〜1990MHZ/ 1920 〜 2170 MHz)的多頻行動通訊頻帶的操作。 【發明内容】 如上所述，本發明的特色在於提供一種多頻單極槽 孔天線，以符合目前行動通訊裝置的需求。 本發明天線包括：一介質基板、一接地面、一單極 槽孔及一饋線。該介質基板具有一第一表面及一相對於 该第一表面之第二表面，為一行動通訊裝置之系統電路 板；該接地面位於該介質基板之第一表面上；該單極槽 孔位於該接地面上，具有一開路端與一終端，該開路^ 位於該接地面一側邊邊緣，而該終端則朝向該接地面之 内部延伸；該饋線位於該介質基板之第二表面上，具有 一起始端與一終端，該起始端電氣連接至一信號源，該 6 200937743 ❹ 饋線並跨過該單極槽孔兩次，使得該終端朝向該起始端 方向延伸。在本項設計中’該單極槽孔可共振出-接近 四分之-波長之共振模態及其高階模態，且該模態分別 為該天線之-第-（較低）及—苐二（較高）操作頻帶 ，和一般共振於二分之一波長之傳統槽孔相比，其所需 尺寸較小’因此更適用於行動通訊裝置。同時藉由該饋 線適當的f折方式可在槽孔不同的位置調整激發高階模 態的等效磁流分布，能有效調整該第二（較高）操作頻 ▼之阻抗匹配，使得本項設計可以涵蓋/ 9〇〇及 DCS/PCS/UMTS多頻頻寬的操作。 【實施方式】 參考第1圖為本發明天線一實施例i，該天線i包 含：一介質基板11、一接地面12、一單極槽孔13及一饋 線其中該介質基板11具有一第一表面111及一相對 ❹於。亥第表面之第二表面112，為一行動通訊裝置之系 統電路板；該接地面12位於該介質基板之第一表面ηι 上，具有一側邊121 ，同時該接地面12經由一連結金屬 線16連接至一金屬片15，該金屬片15為一摺疊式行動通 吼裝置上蓋之支撐金屬背板；該單極槽孔13位於該接地 面12上，具有一開路端與一終端，該開路端位於該接地 面側邊121邊緣，而該終端則朝向該接地面12之内部 延伸，该饋線14位於該介質基板之第二表面112上，具 有起始端與一終端，該起始端電氣連接至一信號源 7 200937743 13兩次，使得該終端朝向 14i ，該饋線跨過該單極槽孔 s亥起始端方向延伸。 第2圖為A施例i的返回損失（[轨⑽〖ο% )實驗量測 釔=圖。在本實施例中，其接地面12之長度約為肋瓜功 、寬度約為45mm，而天線位於接地面之上緣，其所佔 面積約為45 X 9mm2，其主要包含—單極槽孔13，且本 天線&又计係以印刷或蝕刻技術與接地面12同時形成於一 〇厚度為⑽職的玻纖介質基板11上。該單極槽孔13可共 j出該天線之一第一（較低）操作頻帶21及一第二（較 呵）操作頻帶22，其槽孔長度約為42.5 mm，而由於介 質基板之介電效應將使得槽孔長度可略小於四分之一波 長/、振。由實驗結果，在6dB返回損失的定義下，該第 (較低）操作頻帶約有152 MHz (822〜974 MHz)的操作 頻寬’可同時涵蓋GSM85〇頻帶及GSM900頻帶；而該 〇 第二（較高）操作頻帶約有852厘1^(1339〜21911^2)的 知作頻寬，可同時涵蓋DCS頻帶、PCS頻帶及UMTS頻 帶，亦符合多頻應用需求。 第3圖及第4圖各為實施例1於859 MHz與925 MHz之輪射場型圖。由量測之結果可知，天線第一（較 低）操作頻帶21之輻射場型與傳統内藏式平板天線共振 於相同頻率時的輻射場型相似。第5圖、第6圖及第7 圖分別為實施例1於1795 MHz、1920 MHz和2045 MHz之 幸§射場型圖。由量測之結果可知’天線第二（較高）操 8 200937743 作頻帶22内不同頻率之轄射場型皆相當類似，並適合於 行動通訊裝置之應用。而天線增益方面，在第一（較低 )操作頻帶21之增益大致為—〇7dBi〜27dRi，在第二（ •較同）操作頻帶22之天線增益大致為2.1 dBi〜4.7 dBi， 於操作頻帶内之天線增益也都相當穩定，亦符合實際行 動通訊裝置之應用需求。 第8圖及第9圖分別為本發明天線第一其它實施例 ❹8及第二其它實施例9結構圖。實施例8之單極槽孔83 錢形成-倒L形狀，其他天線結構與實施例i相似。 而實施例9之接地面並無連接金屬片15及連結金屬線16 ，其它結構與實施例i相同，只要稍微調整槽孔及饋線 的位置’也可達成相同的效果。上述第8、9圖之兩個 其它實施例均可以達成與之實施例！相似之多頻操作特 性。 ❹以上說明巾所述之實施例僅為說明本發日月之原理及 力j *非限制本發明。因此，習於此技術之人士可在 不違老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。 9 200937743 【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纟士果。 第3圖為本發明天線一實施例於859 MHz之輕射場型圖。 第4圖為本發明天線一實施例於925 MHz之輕射場型圖。 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之韓射場型圖。 ❹第7圖為本發明天線一實施例於2045 MHz之輻射場型圖。 第8圖為本發明天線第一其它實施例結構圖。 第9圖為本發明天線第二其它實施例結構圖。 ❹9 11 主要元件符號說明】 :本發明天線一實施例 :本發明天線第一其它實施例 :本發明天線第二其它實施例 :介質基板 111 112 12 121 13,83 14 141 "質基板之第一表面 "質基板之第二表面 接地面 接地面之一侧邊 单極槽孔 饋線 信號源 200937743 15 :金屬片，或一摺疊式行動通訊裝置上蓋之支撐金 屬背板 16 :連結金屬線 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Su量測結果）200937743 IX. Description of the invention: [Technical field of the invention] The present invention relates to a slot antenna with a frequency monopole slot antenna, which is suitable for the data to be processed. 1. The prior art has many [previous techniques] ❹ 奴 slave wireless communication Technology and market rapid development of many wireless communication products and technologies, the performance of these wireless communication products = affecting the transmission and reception of communication products (4): , 1 匕, in the light, thin, short, small Under the trend trend =, 'the question will affect the value of a product, and most of these products have a flat panel antenna. In this = hand-held mobile communication device, the height of the panel antenna requires about h mm plus the casing and other related components, which tends to make the overall thickness of the handheld mobile communication device not less than 10 mm. Applying this type of antenna design to a thin hand-held mobile device, such as a thin mobile phone (: mobile phone f degrees l〇mm or less), will face the height of the antenna door and can not cater to the thinning of the phone trend. Therefore, an antenna design with planar printing characteristics will provide a possibility to be applied to a thin dynamic communication device, and a printed slot antenna is one of them. U.S. Patent Application Publication No. US 2005 0116870 A1, entitled "MonoP〇le Slot Antenna", discloses a built-in monopole slot antenna design with a quarter wavelength resonance. The size of such a monopole slot antenna is smaller than that of a conventional one-half wavelength resonant slot antenna 5 200937743, and has a large operating bandwidth. However, the single-pole slot is fed in the open end of the slot, which may cause the antenna to not reach the multi-frequency band _ operation. In order to effectively solve the above problems, we propose a single-pole slot antenna with multi-frequency operation, which uses a feed line to feed near the t-position of the monopole slot, and bends the feeder to make its terminal cross the monopole. The slot is twice, and the equivalent magnetic current distribution of the excited high-order mode is adjusted at different positions. © The characteristics of multi-mode resonance are formed in the operating band to form a wide-band operating bandwidth to cover 〇8 850 850/900 (824 ~894]^1^/890~960^&^) Operation with multi-frequency mobile communication band with DCS/PCS/UMTS (1710 ~ 1880 MHz / 1850 ~ 1990MHZ / 1920 ~ 2170 MHz). SUMMARY OF THE INVENTION As described above, the present invention is characterized in that a multi-frequency monopole slot antenna is provided to meet the needs of current mobile communication devices. The antenna of the present invention comprises: a dielectric substrate, a ground plane, a monopole slot and a feed line. The dielectric substrate has a first surface and a second surface opposite to the first surface, and is a system circuit board of a mobile communication device; the ground plane is located on the first surface of the dielectric substrate; the monopole slot is located The grounding surface has an open end and a terminal, the open circuit is located at one edge of the grounding surface, and the terminal extends toward the inside of the grounding surface; the feeding line is located on the second surface of the dielectric substrate, A start end and a terminal electrically connected to a signal source, the 6 200937743 馈 feed line and spanning the single pole slot twice, such that the terminal extends toward the start end. In this design, the monopole slot can resonate - close to the quarter-wavelength resonant mode and its higher-order modes, and the modes are the - (lower) and - 苐 of the antenna, respectively. The second (higher) operating band is smaller in size than conventional slots that typically resonate to one-half of the wavelength' and is therefore more suitable for mobile communication devices. At the same time, the equivalent magnetic flux distribution of the excited high-order mode can be adjusted at different positions of the slot by the proper f-folding manner of the feeding line, and the impedance matching of the second (higher) operating frequency can be effectively adjusted, so that the design is It can cover / 9〇〇 and DCS/PCS/UMTS multi-frequency bandwidth operation. Embodiment 1 Referring to FIG. 1 is an embodiment of an antenna according to the present invention, the antenna i includes: a dielectric substrate 11, a ground plane 12, a monopole slot 13 and a feed line, wherein the dielectric substrate 11 has a first The surface 111 and one are relatively opposite. The second surface 112 of the surface of the first surface is a system circuit board of a mobile communication device; the ground plane 12 is located on the first surface η of the dielectric substrate, and has a side 121, and the ground plane 12 is connected via a connecting metal line 16 is connected to a metal piece 15 which is a supporting metal back plate of a cover of a folding type action overnight device; the single-pole slot 13 is located on the grounding surface 12, and has an open end and a terminal, the open circuit The terminal is located at the edge of the side 121 of the grounding surface, and the terminal extends toward the inside of the grounding surface 12. The feeding line 14 is located on the second surface 112 of the dielectric substrate, and has a starting end and a terminal, and the starting end is electrically connected to A signal source 7 200937743 13 is twice, such that the terminal faces 14i, and the feeder extends across the starting end of the monopole slot. Figure 2 is the return loss of A example i ([Track (10) 〖ο%) experimental measurement 钇 = map. In this embodiment, the length of the grounding surface 12 is about rib work, the width is about 45 mm, and the antenna is located at the upper edge of the ground plane, which occupies an area of about 45 X 9 mm 2 , which mainly includes a monopole slot. 13. The antenna & is further formed on the glass fiber substrate 11 having a thickness of (10) by a printing or etching technique and the ground plane 12. The monopole slot 13 can have a first (lower) operating band 21 and a second (better) operating band 22 of the antenna, and the slot length is about 42.5 mm, and the dielectric substrate is The electrical effect will cause the slot length to be slightly less than a quarter wavelength / vibration. From the experimental results, under the definition of 6dB return loss, the operating bandwidth of the (lower) operating band of about 152 MHz (822~974 MHz) can cover both the GSM85〇 band and the GSM900 band; The (higher) operating band has a known bandwidth of about 852% 1^(1339~21911^2), which can cover both the DCS band, the PCS band and the UMTS band, and is also suitable for multi-frequency applications. Figures 3 and 4 are each a shot pattern of the first embodiment at 859 MHz and 925 MHz. As a result of the measurement, it is known that the radiation pattern of the first (lower) operating band 21 of the antenna is similar to that of the conventional built-in panel antenna at the same frequency. Fig. 5, Fig. 6, and Fig. 7 are the fortunate fields of the embodiment 1 at 1795 MHz, 1920 MHz, and 2045 MHz, respectively. From the results of the measurement, it can be seen that the antenna second (higher) operation 8 200937743 is quite similar in the frequency field of different frequencies in the frequency band 22, and is suitable for the application of the mobile communication device. In terms of antenna gain, the gain in the first (lower) operating band 21 is approximately - 〇 7dBi 〜 27dRi, and the antenna gain in the second ( • the same) operating band 22 is approximately 2.1 dBi 〜 4.7 dBi in the operating band. The antenna gain is also quite stable, which is also in line with the application requirements of practical mobile communication devices. 8 and 9 are structural views of a first embodiment of the antenna 8 and a second embodiment of the present invention, respectively. The monopole slot 83 of Embodiment 8 is formed in an inverted-L shape, and the other antenna structures are similar to Embodiment i. On the ground contact surface of the ninth embodiment, the metal piece 15 and the connecting metal wire 16 are not connected. The other structure is the same as that of the embodiment i, and the same effect can be obtained by slightly adjusting the position of the slot and the feed line. Two other embodiments of the above Figures 8 and 9 can be achieved with the embodiments! Similar multi-frequency operation characteristics. The embodiments described above are merely illustrative of the principles and strengths of the present invention and are not limiting of 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. 9 200937743 [Simplified 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 diagram showing the return loss measurement of a antenna according to an embodiment of the present invention. Figure 3 is a light shot field diagram of an embodiment of the antenna of the present invention at 859 MHz. Figure 4 is a light shot field diagram of an embodiment of the antenna of the present invention at 925 MHz. Figure 5 is a radiation pattern diagram of an antenna of the present invention at 1795 MHz. Figure 6 is a diagram showing the Han field pattern at 1920 MHz of an embodiment of the antenna of the present invention. 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 a first other embodiment of the antenna of the present invention. Figure 9 is a structural view showing a second embodiment of the antenna of the present invention. ❹9 11 main component symbol description: an antenna of the present invention: first embodiment of the antenna of the present invention: second embodiment of the antenna of the present invention: dielectric substrate 111 112 12 121 13, 83 14 141 " One surface "the second surface of the substrate, one of the grounding surfaces, one side of the single pole slot feeder signal source 200937743 15: metal sheet, or a folding mobile communication device upper cover support metal back plate 16: connecting metal wire 21: First operating band (return loss S „ measurement result) 22 : Second operating band (return loss Su measurement result)