200816557 九、發明說明： 【發明所屬之技術領域】 本發明係提供一種天線，尤指一種小型化之多頻天線。 【先前技術】 在現代化資訊社會中，各種無線通訊網路已經成為社 會大眾交換語音或文字訊息、數據、資料、影音檔案的最 重要途徑之一。存取這些以無線電磁波攜載資訊的無線通 訊網路需要利用天線，因此，天線的研發也成為現代資訊 廠商的重點之一。為了讓使用者能更方便地整合存取多種 不同的無線通訊網路，較佳的天線設計應能以單一天線涵 蓋不同無線通訊網路所要求的各種頻帶。另外，為了實現 更小體積、方便使用者隨身攜帶的無線通訊裝置，例如手 機、個人數位助理器（PDA)，天線的體積尺寸也應該要能 盡量縮減，以將天線整合入可攜式的通訊裝置中。 在習知技術中’主要是以平面倒F天線（piFA，卩丨⑽訂 Inverted-F Antenna)來作為無線通訊網路存取之天線。請 參考第1圖，第1圖為習知平面倒F天線1〇。平面倒Η 線10通常係以-平面輕射部12與一基板平面14協同激發 電磁波的震盪。另外’如中華民國發明公報公開號 200419843 (對應美國專利服痛則所揭露者，亦為一 200816557 種平面倒F天線。不過，當天線Η)要作為多頻天線應用時， 其平面輪射部12需要佔社尺寸的平面面積，而平面輕射 部12與基板平面14之間的距離⑽，與天線的頻率以及頻 寬有關，故也不能任意調整。因此，習知平面倒F天線1〇 所佔用的體積無法有效縮減，難以適應小型化與多頻的要 【發明内容】 本發明係提供—種小型化之多頻天線，包含—連接部分，設 置於-第-表面，用來接受訊號饋人或饋出；—第—赫部分， 設置於-與該第—表面相交之第二表面，且連接於該連接部分， =-輪卿分包含複數個分m射部分，設置於該第 =面，且連接於該連接部分，該第二_部分包含複數個分段， ^中知—姆部分之—分段與該第1射部分之—分段平行且 2耦合；以及—第三輻射部分，設置於該第—表面，且連接於 :、接‘ H細部分與該第—細部分以及 部分相互鮮。 π _ 【實施方式】 請參考第2圖以及第3圖，第2圖為本發明多頻天線 之立體不意圖，第3圖為第2圖之天線2〇之上視圖。 =20包含――連接部分22、—第一輻射部分％、一第二輕射部 以及弟二輪射部分28。連接部分22設置於一印刷電路板 7 200816557 30上肖來接叉喊的饋入或饋出。假設印刷電路板為一第一表 面Si，則第-輻射部分24以及第二輻射部分％設置於一與第一 表面S1垂直相父之第二表面S2，且第一輕射部分Μ以及第二輕 射Μ 26皆連接於連接部分22。第一韓射部分24以及第二輕射 口Ρ刀26刀別包含至少一個分段，其中第二輻射部分加之一分段 與第-‘射部124之-分段平行叫目互耦合。第三輻射部分28 设置於印刷電路板30上，也連接於連接部分22，並且與第一輻射 部分24以及第二輻射部分26相互耦合。天線2〇之第一輻射部 分24以及第一輻射部分26採用L〇mm線寬的金屬扁平銅 條繞折成立體表面S2設計後，垂直設置於印刷電路板上， 用來作為天線20之主要幅射元件。在低頻率的頻帶部分， 例如 GSM (Global System for Mobile communication) 850/900(824〜960MHz)的設計上，利用第二輻射部分26較 長的金屬扁平銅條激發出低頻帶所需的頻寬。另一方面， 在高頻率的頻帶部分，例如 GSM1800/1900(1710〜1990MHz)、GPS(Global Positioning System，1575 ± 1·1 MHz)的設計上，則是利用第一輻射部 分24較短的金屬扁平銅條激發出高頻帶所需的頻寬。此 外，設置於印刷電路板30上之第三輻射部分28，藉由連 接部分22與天線20之主要輻射元件相連接，作為幅射輔 助天線，可激發至更高的頻帶，例如WCDMA(Wide-band Code-Division Multiple Access)2100(1920〜2170MHz)。如第 3圖所示，藉由控制第三輻射部分28與第一輻射部分24 8 200816557 以及第二㈣部分26 <_距離di所產生_合效應， 可以搞合出高頻率部分超寬頻的效果，如此就能夠同時將 高頻GSM18_19GG與第三代通訊系統（3G)之wcdma 2100頻帶整合於天線2G上，_小型化天線五頻之應用 ，甚至可 進-步整合GPS頻帶，成為小型化六頻天線。 "月茶考第4圖’第4圖為第2圖之天線20之前視圖。在實際 應用上利用一固定具32來固定第-輻射部分24以及第二輻 射口Ρ刀26 ’此外，第4圖中也標示出第一輻射部分24以 及第一輻射部分26之大小，單位為毫米（mm)。固定具32 可使用介質材料製造，亦即不導電材料 ，例如塑膠材質。 固疋具32上設有各種孔洞溝槽以配合第一輻射部分24以 及第一輕射部分26。當固定具32與第一輻射部分24以及 第一輻射部分26組裝在一起後，因為固定具32上可具有 卡棒、螺絲孔等構造，就能夠將第一輻射部分24以及第二 幸田射4刀26更穩固地安裝於印刷電路板如上。此外，固 定具32不僅可用來固定或保護第一輻射部分24以及第二 幸畜射部分26 ’也可用來支撐通訊裝置中的其它機構。固定 具32的材質可能會對天線20的特性有所影響，不過天線 20可藉由第一輻射部分24以及第二輻射部分26與第三輻 射部分28之間的距離dl來微調天線20特性，補償固定具 32的衫響。反之’亦可透過固定具％之材質來調整天線2〇的特 性0 9 200816557 在上述實施例中，天線20主要是以壓條(stamp)之扁平金屬條 來繞折而成，然而亦可以使用均勻戴面（圓截面）之導體、 來形成天線20或是其它種類的導體來形成天線2〇。此外， 天線20可用單—導體—體成形，例如以均勻截面之金屬直 接繞折出連接部分22、第一輻射部分24以及第二輻射部 7刀26，而第三輻射部分28直接在印刷電路板3〇上形成，更 可節省加工的時間與成本。 請參考第5圖，第5圖為高頻轄射部分以及低頻轄射部分相 互柄合原理之示意圖。帛5 @中，橫軸為頻率，縱軸為頻 域特性的大小，例如頻域特性常以電壓駐波比(v〇hage Standing WaveRatiG，VSWR)來表*。電壓駐波比在頻域的 局部低點（local minimum)可代表一天線的可用頻帶，故電 壓駐波比常絲表現-天線的姉特性，尤其是在頻域的 幸田射特性。若僅考慮低雜射部分，天線的低雜射部分 會以較長的長度而在低頻頻帶（fG附近）激發出低頻的局 部低點（箭號A處，虛線表示）。同理，若僅有高頻輕射部 分二天線齡㈣雜射部分的較短長心摘㈣附近 的高頻頻帶激發出-局部低點（箭號c處，虛線表示）。一 般來說，此高頻頻帶的頻寬’難以用來同時支援不同的高 頻通訊工作頻帶需求(GPS或2G/3G的應用）。不過，本發 明天線20在低頻輻射部分與高頻輻射部分間建立較強的 200816557 相互耦合，而增進天線的整體特性。此相互耦合主要可引 發兩種效應，首先，低頻輻射部分或高頻輻射部八 |刀的相互 耦合可促進低頻輻射部分的倍頻諧波(harmonic)輕合，在^ 頻諧波處激發出一局部低點。低頻輻射部分的2倍頻％^ 可在頻率fl處形成另/扃部低點（箭號B處，虛線表示)/ 也就是頻率fl約為頻率f〇之兩倍，可協助擴展高頻頻帶 的可用頻寬。此外，低頻或向頻輕射部分的相互輕人也了 在天線的不同分段間形成等效互耦或自耦的電感、電容， 而這些電感、電容效應矸適當地降低天線的Q因子 factor)，使天線頻域特性的頻寬增加。Q因子越高則頻寬 越小，故Q因子的降低就會在頻域反映為頻寬的增加。如 第5圖的實線曲線（箭號〇)所示，由於本發明可利用相互耦 合來擴展頻寬，故在頻率Π、f2的局部低點就可因Q因子 減少而擴展，並相互結合，以在南頻合成一寬頻的可用頻 帶，足以支援各種不同的高頻無線通訊需求。 睛參考第6圖，第6圖為第2圖之天線20之量測結果之卞今 圖。利用第2圖中的天線20架構設計，本發明天線可具體 實現出第6圖中的頻域特性，第6圖之橫軸為頻率，縱輛 則為電壓駐波比的大小。由第6圖中可知，本發明天線可 在低頻頻帶支援低頻之GSM850/900,在高頻頻帶的寬頻帶 則可涵蓋GPS、GSM1800/1900以及WCDMA2100的所有 需求，以同一天線支援多種不同頻帶的無線通訊需求，實 200816557 現多頻天線之功能。另一方面，利用控制第3圖中第三_ 射部分28與第一輻射部分24以及第二輻射部分26之間的 距離dl所產生的耦合效應，可很容易地調整在高頻頻帶所 擴展出的寬廣頻寬，能完全支援GPS、GSM 1800/1900與 WCDMA2100的高頻頻帶。 綜上所述，有鑑於小型化多頻段天線與產品輕薄的需求，本 發明天線系統利用金屬扁平銅條作彎曲繞成一小面積幅射作為主 要天線，可提供GSM-850/900/1800/1900、GPS等多種不门 頻帶的應用，此外在印刷電路板上形成一長條的辅助天 線，可提供WCDMA_2100單頻帶的應用。透過這種配置方 式，主要天線與輔助天線所產生的耦合效應，能夠獲得所 需求的多頻帶的頻寬以及良好的幅射增益，以小型化天線 來廣泛支援多種高低不同頻帶之無線通訊的需求，符合第二 代以及第三代通訊系統(2G/3G)之多頻帶功能，並達到產品輕薄短 小美觀的雙重優點。 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範 圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 【圖式簡單說明】 第1圖為習知平面倒F天線之示意圖。 第2圖為本發明多頻天線之立體示意圖。 12 200816557 • 第3圖為第2圖之天線之上視圖。 ' 第4圖為第2圖之天線之前視圖。 第5圖為高頻輻射部分以及低頻輻射部分相互耦合原理之 示意圖。 第6圖為第2圖之天線之量測結果之示意圖。 【主要元件符號說明】 10 天線 12 平面輻射部 14 基板平面 20 天線 22 連接部分 24 第一輻射部分 26 第二輻射部分 28 第三輻射部分 30 印刷電路板 S1 第一表面 S2 第二表面 32 固定具 13200816557 IX. Description of the Invention: [Technical Field] The present invention provides an antenna, and more particularly, a miniaturized multi-frequency antenna. [Prior Art] In the modern information society, various wireless communication networks have become one of the most important ways for the public to exchange voice or text messages, data, materials, and audio and video files. Access to these wireless communication networks carrying information by wireless electromagnetic waves requires the use of antennas. Therefore, the development of antennas has become one of the focuses of modern information manufacturers. In order to allow users to more easily integrate and access a variety of different wireless communication networks, the preferred antenna design should be able to cover various frequency bands required by different wireless communication networks with a single antenna. In addition, in order to realize a smaller wireless device that is convenient for the user to carry around, such as a mobile phone or a personal digital assistant (PDA), the size of the antenna should also be reduced as much as possible to integrate the antenna into the portable communication. In the device. In the prior art, a planar inverted-F antenna (piFA, In(10) ordered Inverted-F Antenna) is used as an antenna for wireless communication network access. Please refer to Figure 1. Figure 1 shows a conventional planar inverted-F antenna. The planar inverted line 10 is typically caused by the -planar light-emitting portion 12 cooperating with a substrate plane 14 to oscillate electromagnetic waves. In addition, as disclosed in the Republic of China Invention Bulletin No. 200419843 (corresponding to the US patent service pain, it is also a 200816557 planar inverted F antenna. However, when the antenna is used as a multi-frequency antenna, its planar firing section) 12 requires a plane area of the size of the social, and the distance (10) between the plane light-emitting portion 12 and the substrate plane 14 is related to the frequency and bandwidth of the antenna, and therefore cannot be arbitrarily adjusted. Therefore, the volume occupied by the conventional planar inverted-F antenna 1〇 cannot be effectively reduced, and it is difficult to adapt to miniaturization and multi-frequency. [Invention] The present invention provides a miniaturized multi-frequency antenna, including a connection portion, which is disposed at - a first surface for receiving a signal feed or a feed; a first portion, disposed on a second surface intersecting the first surface, and coupled to the connection portion, the =-round segment comprises a plurality of points a m-shooting portion, disposed on the erected surface, and connected to the connecting portion, the second _ portion comprising a plurality of segments, wherein the segment of the portion is parallel to the segment of the first segment And 2 coupled; and - the third radiating portion is disposed on the first surface, and is connected to: the 'H thin portion and the first thin portion and the portion are fresh to each other. π _ [Embodiment] Please refer to FIG. 2 and FIG. 3, FIG. 2 is a perspective view of the multi-frequency antenna of the present invention, and FIG. 3 is a top view of the antenna 2 of FIG. = 20 includes - a connecting portion 22, a first radiating portion %, a second light projecting portion, and a second firing portion 28. The connecting portion 22 is disposed on a printed circuit board 7 200816557 30 to feed or feed out. Assuming that the printed circuit board is a first surface Si, the first radiating portion 24 and the second radiating portion % are disposed on a second surface S2 that is perpendicular to the first surface S1, and the first light-emitting portion and the second portion The light cymbals 26 are all connected to the connecting portion 22. The first Korean portion 24 and the second light boring tool 26 include at least one segment, wherein the second radiating portion plus one segment is coupled to the first-segment portion 124-parallel. The third radiating portion 28 is disposed on the printed circuit board 30, is also connected to the connecting portion 22, and is coupled to the first radiating portion 24 and the second radiating portion 26 to each other. The first radiating portion 24 of the antenna 2 and the first radiating portion 26 are formed by folding a metal flat copper strip of L〇mm line width into a body surface S2, and are vertically disposed on the printed circuit board, and are used as the main antenna 20. Radiation element. In the design of a low frequency band portion, such as GSM (Global System for Mobile communication) 850/900 (824 to 960 MHz), the bandwidth required for the low frequency band is excited by the longer metal flat copper strip of the second radiating portion 26. . On the other hand, in the high frequency band portion, for example, GSM1800/1900 (1710 to 1990 MHz), GPS (Global Positioning System, 1575 ± 1·1 MHz), the design uses the shorter metal of the first radiating portion 24. The flat copper strip excites the bandwidth required for the high frequency band. In addition, the third radiating portion 28 disposed on the printed circuit board 30 is connected to the main radiating element of the antenna 20 by the connecting portion 22, and can be excited as a radiation auxiliary antenna to a higher frequency band, such as WCDMA (Wide- Band Code-Division Multiple Access) 2100 (1920~2170MHz). As shown in FIG. 3, by controlling the third radiation portion 28 and the first radiation portion 24 8 2008 16557 and the second (four) portion 26 < _ distance di generated by the combined effect, it is possible to combine the high frequency portion of the ultra-wideband The effect is that the high-frequency GSM18_19GG and the third-generation communication system (3G) wcdma 2100 band can be integrated on the antenna 2G at the same time, and the application of the miniaturized antenna five-frequency can be further integrated into the GPS band to become miniaturized. Six-frequency antenna. "月茶考第4图' Fig. 4 is a front view of the antenna 20 of Fig. 2. In a practical application, a fixture 32 is used to fix the first radiating portion 24 and the second radiating port file 26'. In addition, the size of the first radiating portion 24 and the first radiating portion 26 is also indicated in FIG. 4, and the unit is Millimeter (mm). The fixture 32 can be made of a dielectric material, that is, a non-conductive material such as a plastic material. The solid cooker 32 is provided with various hole grooves to fit the first radiating portion 24 and the first light projecting portion 26. When the fixture 32 is assembled with the first radiating portion 24 and the first radiating portion 26, since the fixture 32 can have a structure such as a click bar, a screw hole, etc., the first radiating portion 24 and the second Koda can be shot 4 The knife 26 is more securely mounted on the printed circuit board as above. In addition, the fixture 32 can be used not only to secure or protect the first radiating portion 24 and the second forcing portion 26' but also to support other mechanisms in the communication device. The material of the fixture 32 may have an effect on the characteristics of the antenna 20, but the antenna 20 may fine tune the characteristics of the antenna 20 by the distance dl between the first radiating portion 24 and the second radiating portion 26 and the third radiating portion 28. The shirt of the fixture 32 is compensated. Conversely, the characteristics of the antenna 2 can also be adjusted through the material of the fixture. 0 9 200816557 In the above embodiment, the antenna 20 is mainly wound by a flat metal strip of a stamp, but it can also be used evenly. The conductor of the face (round cross section) is worn to form the antenna 20 or other kinds of conductors to form the antenna 2〇. In addition, the antenna 20 can be formed by a single-conductor body, for example, a metal having a uniform cross section directly wraps off the connecting portion 22, the first radiating portion 24, and the second radiating portion 7 knife 26, and the third radiating portion 28 is directly on the printed circuit. Formed on the plate 3, it saves time and cost of processing. Please refer to Figure 5, which is a schematic diagram of the principle of mutual shank of the high-frequency ray-distributing part and the low-frequency conditioned part.帛5 @中, the horizontal axis is the frequency, and the vertical axis is the magnitude of the frequency domain characteristics. For example, the frequency domain characteristics are often expressed by the voltage standing wave ratio (v〇hage Standing WaveRatiG, VSWR). The local standing wave ratio of the voltage standing wave ratio in the frequency domain can represent the available frequency band of an antenna, so the voltage standing wave is better than the normal wire performance - the antenna characteristics of the antenna, especially in the frequency domain. If only the low-noise portion is considered, the low-pitched portion of the antenna will excite a low-frequency local low point (indicated by arrow A, indicated by the dashed line) in the low-frequency band (near fG) with a longer length. Similarly, if only the high-frequency light-emitting part is two-antennary (four), the high-frequency band near the shorter long-hearted pick (4) of the astigmatism part excites a local low point (arrow c, dashed line). In general, the bandwidth of this high frequency band is difficult to support different high frequency communication operating band requirements (GPS or 2G/3G applications). However, the antenna 20 of the present invention establishes a strong 200816557 mutual coupling between the low frequency radiating portion and the high frequency radiating portion to enhance the overall characteristics of the antenna. This mutual coupling can mainly induce two kinds of effects. First, the mutual coupling of the low-frequency radiating part or the high-frequency radiating part of the eight-knife can promote the harmonic convergence of the low-frequency radiating part, and excite the harmonic in the harmonic part. A partial low point. The 2nd frequency %^ of the low-frequency radiating part can form another /扃 low point at the frequency fl (at the arrow B, indicated by the dotted line) / that is, the frequency fl is about twice the frequency f〇, which can help expand the high-frequency band. Available bandwidth. In addition, the low-frequency or the light-frequency part of the light-emitting part also forms equivalent mutual coupling or auto-coupled inductance and capacitance between different segments of the antenna, and these inductance and capacitance effects 矸 appropriately reduce the Q factor of the antenna ), increasing the bandwidth of the antenna's frequency domain characteristics. The higher the Q factor, the smaller the bandwidth, so the decrease in the Q factor is reflected in the frequency domain as an increase in bandwidth. As shown by the solid curve (arrow 〇) in Fig. 5, since the present invention can utilize the mutual coupling to spread the bandwidth, the local low points of the frequencies Π and f2 can be expanded by the decrease of the Q factor and combined with each other. To synthesize a wide frequency band in the south frequency, enough to support a variety of different high frequency wireless communication needs. The eye is referred to Fig. 6, and Fig. 6 is the current measurement result of the antenna 20 of Fig. 2. With the antenna 20 architecture design in Fig. 2, the antenna of the present invention can realize the frequency domain characteristics in Fig. 6, the horizontal axis of Fig. 6 is the frequency, and the vertical is the magnitude of the voltage standing wave ratio. As can be seen from Fig. 6, the antenna of the present invention can support the low frequency GSM850/900 in the low frequency band, and the wide frequency band in the high frequency band can cover all the requirements of GPS, GSM1800/1900 and WCDMA2100, and support multiple different frequency bands with the same antenna. Wireless communication needs, real 200816557 The function of multi-frequency antenna. On the other hand, by controlling the coupling effect produced by the distance dl between the third radiating portion 28 and the first radiating portion 24 and the second radiating portion 26 in Fig. 3, the expansion in the high frequency band can be easily adjusted. The wide bandwidth is available to fully support the high frequency bands of GPS, GSM 1800/1900 and WCDMA2100. In summary, in view of the demand for miniaturized multi-band antennas and thin products, the antenna system of the present invention uses a metal flat copper strip for bending into a small area of radiation as a main antenna, and can provide GSM-850/900/1800/1900. Applications such as GPS, GPS, etc., in addition to forming a long auxiliary antenna on the printed circuit board, can provide WCDMA_2100 single-band applications. Through this configuration, the coupling effect between the main antenna and the auxiliary antenna can obtain the required multi-band bandwidth and good radiation gain, and miniaturize the antenna to widely support the wireless communication requirements of various high and low frequency bands. It meets the multi-band functions of the second-generation and third-generation communication systems (2G/3G) and achieves the dual advantages of light, thin, and beautiful appearance. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should fall within the scope of the present invention. [Simple Description of the Drawing] Fig. 1 is a schematic diagram of a conventional planar inverted-F antenna. 2 is a perspective view of a multi-frequency antenna of the present invention. 12 200816557 • Figure 3 is a top view of the antenna in Figure 2. 'Figure 4 is a front view of the antenna of Figure 2. Fig. 5 is a schematic diagram showing the principle of mutual coupling of the high-frequency radiation portion and the low-frequency radiation portion. Figure 6 is a schematic diagram showing the measurement results of the antenna of Figure 2. [Main component symbol description] 10 Antenna 12 Planar radiating portion 14 Substrate plane 20 Antenna 22 Connecting portion 24 First radiating portion 26 Second radiating portion 28 Third radiating portion 30 Printed circuit board S1 First surface S2 Second surface 32 Fixing device 13