1364135 九、發明說明： 【發明所屬之技術領域】 本發明係為一種行動通訊天線，特別是一種使用耦合 式饋入（coupled-fed)之行動通訊天線，適合應用於GSM850/ 900/1800/1900/UMTS 多頻之操作。 【先前技術】 由於無線通訊科技的快速發展，衍生出相當多的技術 鲁以及產品，使得無線通訊已經漸漸融入現今人類的生活當 中，在各式各樣的產品當中以手機為最熱門之通訊產品。 傳統手機天線所激發的最低共振模態主要為四分之一波長 ' 共振模態，因此多半會將天線輻射共振路徑使用蜿蜓或是 多次彎折等設計方式來降低天線所佔之體積，以達成天線 之縮小化。如台灣專利公告號第1287,321號“倒F形平板天 線”，其揭示一種使用四分之一波長共振之内藏式手機天 線即為一例。但是使用蜿蜒或彎折等設計方式相對的會造 ® 成天線的操作頻寬縮減，而使得天線的操作頻寬並不容易 達成無線廣域網路(WWAN，Wireless Wide Area Network) GSM850/ 900/1800/1900/UMTS五頻頻段之多頻操作。 在本發明中我們提出一種適用於行動通訊裝置的耦合 式饋入多頻天線設計，其操作頻寬可以涵蓋GSM850(824〜 894 MHz)、GSM900 (890 〜960 MHz)、GSM1800 (1710 〜1880 MHz)、GSM1900 (1850 〜1990 MHz)及 UMTS (1920 〜2170 MHz) 之通訊頻帶的需求，而此設計主要以一創新的耦合式饋入 6 U04135 機制取代傳統的直接饋人方式’經由適當調整使得天線之 八分之-波長共振模態可以有效被激發並具有良好的阻抗 '匹配’藉此降低天線之共振路徑長度，進而使得天線體積 •旎夠有效縮減。同時本設計天線結構簡單易於使用姓刻、 -印刷或射出成形技術形成於電路板上，使得製作成本得以 降低’故本發明天線相當適合應用於行動通訊裝置中。 【發明内容】 _ 如上所it本發明之目的在於提供_種搞合式饋入行 動，Λ天線，其不僅可以涵蓋GSM85〇/9觀丽測舰TS五 頻操作同時也達到天線體積縮小化之功效，因此本發明 天線相當適合應用於手機等行動通訊裝置中。 本發明天線，包含：一電路板、一接地面及一天線元 。該電路板可以為—行動通訊裝置之系統電路板。該接 地面位於該電路板—1364135 IX. Description of the Invention: [Technical Field] The present invention relates to a mobile communication antenna, and more particularly to a coupled-fed mobile communication antenna suitable for use in GSM850/900/1800/1900 /UMTS Multi-frequency operation. [Prior Art] Due to the rapid development of wireless communication technology, a considerable number of technologies and products have been derived, making wireless communication gradually integrated into the lives of today's human beings. Mobile phones are the most popular communication products among various products. . The lowest resonance mode excited by the traditional mobile phone antenna is mainly the quarter-wavelength 'resonance mode, so most of the antenna radiation path will be used or reduced multiple times to reduce the volume occupied by the antenna. In order to achieve the reduction of the antenna. For example, Taiwan Patent Publication No. 1287,321 "Inverted F-shaped flat antenna" discloses an example of a built-in mobile phone antenna using quarter-wave resonance. However, the design bandwidth of the antenna is reduced by using a design such as 蜿蜒 or bending, so that the operating bandwidth of the antenna is not easy to achieve a wireless wide area network (WWAN) GSM850/900/1800. Multi-frequency operation of the /1900/UMTS five-frequency band. In the present invention, we propose a coupled feed multi-frequency antenna design suitable for mobile communication devices, which can cover GSM850 (824~894 MHz), GSM900 (890~960 MHz), GSM1800 (1710~1880 MHz). ), the GSM1900 (1850 to 1990 MHz) and UMTS (1920 ~ 2170 MHz) communication band requirements, and this design is mainly replaced by an innovative coupled feed 6 U04135 mechanism to replace the traditional direct feed mode 'via appropriate adjustments The eighth-wavelength resonant mode of the antenna can be effectively excited and has a good impedance 'match' to thereby reduce the resonant path length of the antenna, thereby making the antenna volume sufficiently effective. At the same time, the antenna structure of the present invention is simple and easy to use, and the printing or injection molding technology is formed on the circuit board, so that the manufacturing cost can be reduced. Therefore, the antenna of the present invention is quite suitable for use in a mobile communication device. SUMMARY OF THE INVENTION As described above, the object of the present invention is to provide a kind of engaging operation, a Λ antenna, which can cover not only the GSM85 〇/9 spectroscopy ship TS five-frequency operation but also the reduction of the antenna volume. Therefore, the antenna of the present invention is quite suitable for use in a mobile communication device such as a mobile phone. The antenna of the present invention comprises: a circuit board, a ground plane and an antenna element. The circuit board can be a system board of a mobile communication device. The ground is located on the board -
表面上，具有一邊緣，且該邊緣位 於該電路板内部，使該電路板具有—無接地面區間。該天 t件位於該電路板之無接地面區間上，包含一輻射金 部及一饋入部。該輻射金屬部係以蝕刻、印刷或射出成 =技術形成於該電路板上’包含：一第一轉射金屬部，具 t至少一次彎折’其長度接近天線第-（低頻）操作頻帶 +心頻f之八分之-波長，及-第二輻射金屬冑，具有至 折，並連接至該第—轄射金屬部，其長度接近天 、入：（低頻）操作頻帶中心頻率之八分之一波長。該饋 σΗ糸⑽刻m射出成形技術形成於該電路板上， 7 1364135 包含-第-金屬元件，其一端電氣連接至該轄射金屬部； 第金屬7C件，具有一饋入點，為天線之饋入點，該饋 .入點並連接至-信號源，同時該第二金屬元件與該第一金 •屬元件之間具有-特定間距（―般少於2mm);及一短路 •金屬元件，其-端電氣連接至該第一金屬元件，另一端則 電氣連接至該接地面。 在本項發明天料，我們使用搞合式饋入技術可以降 •低第-（低頻）操作頻帶的實部阻抗值，且由調整該饋入 部之尺寸可以有效地增加電容性，以降低第一（低頻）操 作頻T之電感性，再藉由適當調整該短路金屬元件的尺寸 ，可以使第一（低頻）操作頻帶達到良好的阻抗匹配。該 輻射金屬部之第一輻射金屬部及第二輻射金屬部所共振之 模態（皆為八分之一波長共振模態）可以合成一寬頻頻段 涵蓋GSM850/900 (824〜960 MHz)之操作。同時利用該輻射金 籲屬&部之第一輻射金屬部及第二輻射金屬部所共振之倍頻（ 皆為四分之一波長共振模態）可以合成一寬頻頻段涵蓋 GSM1800/1900/UMTS (1710 〜2170 MHz)之操作。 【實施方式】 第1圖為本發明天線一實施例1之結構圖，包含：一 電路板11 ; 一接地面12，位於該電路板11之一表面上，具 有一邊緣121 ，且該邊緣121位於該電路板u内部使^ 電路板11具有一無接地面區間m ;及一天線元件13，= 於該電路板11之無接地面區間111上，包含：—輕射金屬 系乂钱刻印刷或射出成形技術形成於該電路板11上 ’包含：-第-輻射金屬部131，具有至少一次-折，其 又接近天線第（低頻）操作頻帶中心頻率之八分之-皮長及第一輻射金屬部132，具有至少一次彎折，並 連接，該第一輻射金屬部131，其長度接近天線第-（低 頻）操作頻帶t心頻率之八分之—波長；及—饋入部133 ’係以㈣、印刷或射出成形技術形成於該電路板11上， 第-金屬TL件134，其—端電氣連接至_射金屬 # ’第-金屬兀件135 ’具有一饋入點136，為天線之 饋入點，該饋入點並連接至—信號源14，同時該第二金屬 凡件135與該第-金屬元件134之間具有一特定間距138 ;及一短路金>1元件137，其—端電氣連接至該第一金屬 70件134 ，另一端則電氣連接至該接地面12。 第2圖為本發明天線實施例丨的返回損失量測結果。 在實施例1中選擇下列尺寸進行實驗量測：電路板u長度 約為115mm、寬度約為4〇mm ;接地面12長度約為丨⑻爪⑺ 、寬度約為40mm ;天線元件13，包含：一輻射金屬部， 包含：一第一輻射金屬部131長度約為35mm (接近9〇〇 MHz之八分之一波長）、寬度約為〇.5mm ;及一第二輻射 金屬元件132長度約為33 mm (接近9〇〇 mhz之八分之一 波長）、寬度約為0.5 mm ; —饋入部133 ，包含：一第一 金屬元件134長度約為12mm、寬度約為15mm ; 一第二 金屬元件135長度約為12mm、寬度約為3111111 ;及一短路 1364135 金屬元件137長度約為20mm、寬度約為〇.5mm。此外第 金屬元件與第二金屬元件之特定間距約為〇 6 mm。由所 -得實驗結果，在6dB返回損失的定義下，其第一（低頻） :操作頻帶21足以涵蓋GSM850/900兩個通訊頻帶，而第二（ 同頻）操作頻帶22則足以涵蓋GSM1800/1900及UMTS三個 通訊頻帶。 — 第3圖為本發明天線一其他實施例3之結構圖，包含 鲁 電路板11 ; 一接地面丨2 ,位於該電路板11之一表面上 ，具有一邊緣121 ，且該邊緣121位於該電路板n内部， 使該電路板11具有一無接地面區間111 ;及一天線元件13 ，包含：一介質基板31，位於該電路板11之一無接地面區 間111上，且大致垂直該電路板u ; 一輻射金屬部，係以 蝕刻、印刷或射出成形技術形成於該介質基板31上，包含 :一第一輻射金屬部331 ，具有至少一次彎折，且其長度 鲁接近天線第一（低頻）操作頻帶中心頻率之八分之一波長 及第一輻射金屬部332，具有至少一次彎折，並連接 至忒第一輻射金屬部331 ，且其長度接近天線第一（低頻 )操作頻帶中心頻率之八分之一波長；及一饋入部333， 位於該質基板31上，係以餘刻、印刷或射出成形技術形 ^於該介質基板31上，包含：一第一金屬元件334，其一 端電氣連接至該輻射金屬部；一第二金屬元件，其一 端經由位於該電路板11無接地面區間ill之一饋入金屬連 接，、友34電氣連接至一訊號源14，該第二金屬元件奶與該 1364135 第一金屬元件336之間具有一特定間距338 ( 一般少於2 mm)，及一短路金屬元件337，其一端電氣連接至該第一 金屬兀件334，另一端經由位於該電路板u之無接地面區 ；間111之一短路金屬連接線35短路至該接地面12。上述之 饋入金屬連接線34及短路金屬連接線35係以蝕刻或印刷技 術形成於該電路板1丨上。實施例3主要是將天線元件13形 成於介質基板31上，實際使用時再將天線元件13大致垂直 鲁置放並電氣連接至電路板U之短路金屬連接線35及饋入金 屬連接線34即可。本實施例3之天線結構與實施例1大致 相同因此亦能獲得與實施例1近似的結果，符合行動通訊 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其 功效’而非限制本發明。因此，習於此技術之人士可在不 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結構圖。 第2圖為本發明天線一實施例之返回損失實驗量測曲線。 第3圖為本發明天線一其他實施例結構圖。 【主要元件符號說明】 :本發明天線一實施例 :電路板 11 1364135 111 :電珞板之一無接地面區間 12 :接地面 121 :接地面之一邊緣 122 :接地面之一短路點 13,33 :天線元件 131.331 :第一輻射金屬部 132.332 :第二輻射金屬部 133, 333 :饋入部On the surface, there is an edge which is located inside the board so that the board has a no-ground plane interval. The day t is located on the ungrounded surface of the circuit board and includes a radiation gold portion and a feed portion. The radiant metal portion is formed on the circuit board by etching, printing or emitting into a technology=including: a first rotating metal portion having at least one bend of 'the length of the antenna is close to the first (low frequency) operating band of the antenna + The eighth frequency of the heart frequency f - the wavelength, and - the second radiating metal 胄, has a fold, and is connected to the first radiant metal portion, the length of which is close to the sky, the input: (low frequency) the operating frequency band center frequency of eight points One wavelength. The feeding σΗ糸(10)-m injection molding technique is formed on the circuit board, and the 7 1364135 includes a -metal element, one end of which is electrically connected to the urging metal portion; the metal 7C member has a feeding point and is an antenna a feed point, the feed point is connected to the -signal source, and the second metal component and the first metal component have a specific spacing ("typically less than 2 mm"); and a short circuit The component has its end electrically connected to the first metal component and the other end electrically connected to the ground plane. In the invention of the invention, we can use the combined feed technology to reduce the real impedance value of the low-low frequency operation band, and the capacitance can be effectively increased by adjusting the size of the feed portion to reduce the first (Infrared) The inductivity of the operating frequency T, and by appropriately adjusting the size of the shorted metal component, the first (low frequency) operating band can achieve good impedance matching. The mode of resonance of the first radiating metal portion and the second radiating metal portion of the radiating metal portion (all of which is an eighth-wavelength resonant mode) can synthesize a wide frequency band covering operation of GSM850/900 (824 to 960 MHz) . At the same time, the frequency doubling frequency (including the quarter-wave resonance mode) of the first radiating metal portion and the second radiating metal portion of the radiating portion can be combined to cover a wide frequency band covering GSM1800/1900/UMTS. (1710 ~ 2170 MHz) operation. [Embodiment] FIG. 1 is a structural diagram of a first embodiment of an antenna according to the present invention, comprising: a circuit board 11; a ground plane 12 on one surface of the circuit board 11 having an edge 121 and the edge 121 Located inside the circuit board u, the circuit board 11 has a non-grounding surface section m; and an antenna element 13 is formed on the ungrounded surface section 111 of the circuit board 11, and includes: - a light-emitting metal system Or an injection molding technique formed on the circuit board 11' includes: - a first-radiation metal portion 131 having at least one-fold, which is close to eight points of the center frequency of the antenna (low frequency) operating band - the length of the skin and the first The radiating metal portion 132 has at least one bend and is connected, and the first radiating metal portion 131 has a length close to eight-wavelength of the antenna frequency of the first (low frequency) operating band of the antenna; and - the feeding portion 133 ' Formed on the circuit board 11 by (4), printing or injection molding technology, the first metal TL member 134, the terminal is electrically connected to the _metal metal # 'the metal element 135' has a feeding point 136, which is an antenna Feed point, the feed point is connected to The signal source 14 has a specific spacing 138 between the second metal member 135 and the first metal member 134; and a short circuit gold > 1 element 137 whose terminal is electrically connected to the first metal 70 member 134 The other end is electrically connected to the ground plane 12. Figure 2 is a graph showing the return loss measurement of the antenna embodiment of the present invention. In the first embodiment, the following dimensions were selected for experimental measurement: the circuit board u has a length of about 115 mm and a width of about 4 mm; the ground plane 12 has a length of about 丨 (8) claws (7) and a width of about 40 mm; and the antenna element 13 includes: a radiating metal portion comprising: a first radiating metal portion 131 having a length of about 35 mm (close to an eighth wavelength of 9 〇〇 MHz), a width of about 5.5 mm; and a second radiating metal member 132 having a length of about 33 mm (close to one-eighth wavelength of 9〇〇mhz), width of about 0.5 mm; - feed-in portion 133, comprising: a first metal member 134 having a length of about 12 mm and a width of about 15 mm; a second metal component 135 has a length of about 12 mm and a width of about 3111111; and a short circuit 1364135. The metal element 137 has a length of about 20 mm and a width of about 55 mm. Furthermore, the specific spacing between the metal element and the second metal element is approximately 〇 6 mm. From the experimental results obtained, under the definition of 6dB return loss, its first (low frequency): operating band 21 is sufficient to cover two communication bands of GSM850/900, while the second (same frequency) operating band 22 is sufficient to cover GSM1800/ Three communication bands of 1900 and UMTS. - Figure 3 is a block diagram of another embodiment 3 of the antenna of the present invention, including a circuit board 11; a ground plane 丨2, located on a surface of the circuit board 11, having an edge 121, and the edge 121 is located at the edge Inside the circuit board n, the circuit board 11 has a groundless surface section 111; and an antenna element 13 includes: a dielectric substrate 31 on one of the circuit board 11 having no ground plane section 111 and substantially perpendicular to the circuit a radiant metal portion formed on the dielectric substrate 31 by etching, printing or injection molding, comprising: a first radiant metal portion 331 having at least one bend and having a length close to the antenna first ( The low frequency) one-eighth wavelength of the center frequency of the operating band and the first radiating metal portion 332 have at least one bend and are connected to the first radiating metal portion 331 and have a length close to the center of the first (low frequency) operating band of the antenna One-eighth wavelength of the frequency; and a feed-in portion 333, located on the substrate 31, is formed on the dielectric substrate 31 by a lithography, printing or injection molding technique, and includes: a first metal component 334, One end is electrically connected to the radiant metal portion; a second metal member is fed into the metal connection via one of the ground planes ill of the circuit board 11 , and the friend 34 is electrically connected to a signal source 14 , the second metal The component milk has a specific spacing 338 (typically less than 2 mm) from the 1364135 first metal component 336, and a shorting metal component 337 having one end electrically connected to the first metal component 334 and the other end The ground plane area of the circuit board u is short-circuited to the ground plane 12 by one of the short-circuit metal connection lines 35. The feed metal connection line 34 and the short metal connection line 35 described above are formed on the circuit board 1 by etching or printing techniques. In the third embodiment, the antenna element 13 is formed on the dielectric substrate 31. In actual use, the antenna element 13 is placed substantially vertically and electrically connected to the short-circuit metal connection line 35 of the circuit board U and the metal connection line 34. can. The antenna structure of the third embodiment is substantially the same as that of the first embodiment, so that the results similar to those of the embodiment 1 can be obtained, which is in accordance with the use requirements of the mobile communication product. 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 scope of the patent application described hereinafter. 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 return loss experimental measurement of an antenna according to an embodiment of the present invention. Fig. 3 is a structural view showing another embodiment of the antenna of the present invention. [Description of main component symbols]: Embodiment of the antenna of the present invention: circuit board 11 1364135 111: one of the electric slabs has no grounding surface section 12: the grounding surface 121: one edge of the grounding surface 122: one short-circuit point 13 of the grounding surface, 33: antenna element 131.331: first radiating metal portion 132.332: second radiating metal portion 133, 333: feed portion
134.334 :第一金屬元件 135.335 :第二金屬元件 136 :饋入點 137,337 :短路金屬元件 138, 338 :第一金屬元件與第二金屬元件之特定間距 14 :信號源 21 :第一（低頻）操作頻帶 22 :第二（高頻）操作頻帶 3 :本發明天線一其他實施例 31 :介質基板 311 :介質基板之一表面 34 :饋入金屬連接線 35 :短路金屬連接線 12134.334: first metal component 135.335: second metal component 136: feed point 137, 337: short metal component 138, 338: specific spacing of first metal component and second metal component 14: signal source 21: first (low frequency) operation Band 22: Second (high frequency) operating band 3: Antenna of the invention - Other embodiment 31: Dielectric substrate 311: One surface of the dielectric substrate 34: Feed metal connection 35: Short metal connection 12