200905989 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種天線，特別關於一種單頻天線。 【先前技術】 無線傳輸技術係廣泛地應用多種頻段以進行傳輸，而 為滿足消費者需求，現今許多電子產品大多具有無線傳輸 的功能。在無線傳輸系統中，天線是用來發射與接收電磁 波能量的重要元件，若是沒有了天線，則無線傳輸系統將 會無法發射與接收資料。因此，天線的角色在無線傳輸來 說，是不可或缺的一環。 選用適當的天線除了有助於搭配産品的外型以及提 升傳輸品質外，還可以更進一步降低產品成本。由於目前 在各種不同的應用産品中，所使用的天線設計方法與製作 材質也不盡相同，另外，針對每一個國家對所需要的使用 頻帶不同，因此在設計天線時亦要加入許多因素的考量。 請參照圖1所示，一種習知的單頻天線1包含一輻射 單元11、一饋入單元12及一接地單元13。其中，輻射單 元11係為一平板、並呈長條狀；饋入單元12係由輻射單 元11之一處凸設；接地單元13係由輪射單元11之一端凸 設，且接地單元13之凸設方向與饋入單元12之凸設方向 相同。 單頻天線1藉由輻射單元11可操作於一頻段，例如 為符合電機電子工程師學會（Institute of Electrical and 5 200905989200905989 IX. INSTRUCTIONS: TECHNICAL FIELD OF THE INVENTION The present invention relates to an antenna, and more particularly to a single frequency antenna. [Prior Art] Wireless transmission technology widely uses a variety of frequency bands for transmission, and many of today's electronic products have wireless transmission functions to meet consumer demands. In wireless transmission systems, the antenna is an important component for transmitting and receiving electromagnetic energy. If there is no antenna, the wireless transmission system will not be able to transmit and receive data. Therefore, the role of the antenna is an indispensable part of wireless transmission. In addition to helping to match the appearance of the product and improving the transmission quality, the selection of an appropriate antenna can further reduce the cost of the product. Because the antenna design methods and materials used in different applications are different, and the frequency bands required for each country are different, many factors must be added when designing the antenna. . Referring to FIG. 1, a conventional single-frequency antenna 1 includes a radiating unit 11, a feeding unit 12, and a grounding unit 13. The radiation unit 11 is a flat plate and has an elongated shape; the feeding unit 12 is protruded from one of the radiation units 11; the grounding unit 13 is protruded from one end of the rolling unit 11, and the grounding unit 13 is The protruding direction is the same as the protruding direction of the feeding unit 12. The single-frequency antenna 1 is operable in a frequency band by the radiating unit 11, for example, in accordance with the Institute of Electrical and Electronics Engineers (Institute of Electrical and 5 200905989)
Electronic Engineers, IEEE) 802.llb/g 規範之 2_4GHz，或 符合ffiEE 802.11a規範之5GHz等等。 然而，在設計上，為了要使單頻天線1之電感電容效 應較明顯，需要使饋入單元12及接地單元13之間距超過 一定的長度，例如3mm，但這亦成為單頻天線1在設計上 及將來的配置上之一種限制。此外，單頻天線1之輻射單 元11係呈長條狀，整體而言，單頻天線1之長度太長， 而不利於「小型化」之需求，特別是在操作頻段為低頻的 情況下。 因此，如何提供一種小型化之單頻天線，並減少設計 上的限制，進而提升天線之適應性及效能，實為重要課題 之一 ° 【發明内容】 有鑑於上述課題，本發明之目的為提供一種小型化、 且減少設計上的限制，進而提升適應性及整體效能之單頻 天線。 緣是，為達上述目的，依據本發明之一種單頻天線包 含一輻射單元、一接地單元、一饋入單元以及一導電單 元。輕射單元係具有一彎折部；接地單元及饋入單元係由 輻射單元之一端部凸設，且接地單元及饋入單元之間係具 有一間距；導電單元係具有一導電體及一接地導體，導電 體係與饋入單元電性連接，接地導體係與接地單元電性連 200905989 承上所述，因依據本發明之一種單頻天線之輻射單元 係具有一彎折部，彎折部可呈勾狀、直角狀或弧狀等等， 故與習知技術相較，在相同的共振路徑下，本發明之輻射 單元的長度可相對地縮短，進而使單頻天線小型化；此 外，本發明藉由輻射單元之彎折部，可大幅提升單頻天線 之電感電容效應，即在設計上，單頻天線之饋入單元及接 地單元之間距可較習知技術縮短，進而減少設計上的限 制，並提升天線的適應性及效能；再者，本發明可藉由輻 射單元設置於一基板上方，以及接地單元及饋入單元直接 設置於基板上，更利於產品小型化的設計並降低製造的成 本。另外，本發明之單頻天線之接地單元及饋入單元可以 表面黏著技術連接於電路板，故可簡化天線製程並提升整 體結構強度。 【實施方式】 以下將參照相關圖式，說明依據本發明較佳實施例之 一種單頻天線，其中相同的元件將以相同的參照符號加以 說明。 請參照圖2所示，本發明較佳實施例之一種單頻天線 2係包含一輻射單元21、一接地單元22及一饋入單元23。 其中，輻射單元21係具有一彎折部211，在本實施例中， 輻射單元21係為一金屬平板，而彎折部211可呈勾狀、 直角狀或弧狀等等，於此並不加以限制；接地單元22及 饋入單元23係由輻射單元21之一端部212凸設，且接地 7 200905989 單元22及饋入單元23之問作目士 艾間仏具有一間距D，在本實施例 中，間距D係小於3mm。 汽鉍例 請參照圖3所示，單頻夭 βσ __ , 干項天線2更包含一基板24，輻射 早元21係藉由接地單亓7 ρ ^… 及饋入單元23設置於基板24 上，於此基板24係為一印|丨| 。「刷電路板。基板24係具有一接 地區241 ’韓射單元21俜盘垃 保興接地區241相對而設，而接地 單元22係與接地區24ι雷 y 窀性連接，接地區241較佳狀態 係設置於基板24的邊緣或角落。 〜 在本實施财’接地單元Μ及饋人單元Μ具有複數 種悲樣以Dx置於基板24上。例如接地單元22係具有一接 腳221，接腳221係插設於基板Μ，當然基板Μ上亦有 對應之孔洞242以供接腳221插設；或是饋入單元23具 有一連接墊231 ’連接墊231係焊接於基板％之一連接墊 243,於此，連接墊231可藉由表面黏著技術（SurfaceM〇unt Technology，SMT)而表面黏著於基板24之連接墊243上。 當然，接地單元22亦可利用連接墊焊接於基板24 ;或是 饋入單元23可利用接腳插設於基板24上。 另外’本實施例之單頻天線2係可設置於一電子裝置 内’例如筆記型電腦、行動通訊裝置或個人數位助理 (Personal Digital Assistant，PDA)等等的攜輋式電子裝 置；當然，本實施例之單頻天線2亦可應用於其他需要天 線之電子裝置上，例如一具有PCMCIA( Personal Computer Memory Card International Association)介面之網路介面卡 或是CF (CompactFlash)介面卡。當然，若在一些特定的 200905989 規範之下，例如在IEEE 802.lln的規範下需要以三個天線 來進行多工處理，單頻天線2亦可與其他天線配合工作， 或是以複數個單頻天線2之方式來工作。 請參照圖4所示，其係顯示接地單元22及饋入單元 23设置於基板24上。另外，單頻天線2更包含一導電單 元25，例如但不限於一同轴傳輸線。如圖4所示，導電單 元25係具有一導電體251及一接地導體252。其中，導電 體251係與館入單元23電性連接，而接地導體252係與 接地單元22電性連接。於此’接地導體252係可直接或 間接地與接地單元22電性連接，例如接地導體252係可 與接地區241電性連接，而間接與接地單元22電性連接。 此外’導電單元25更具有一第一絕緣層253及一第二絕 緣層254，其中第一絕緣層253係設置在導電體251與接 地導體252之間以隔離兩者之間的電氣訊號，而第二絕緣 層254係設置於導電單元25之最外層以作為絕緣及保護 作用。 承上所述’單頻天線2係藉由輻射單元21而操作於 一頻段，於本實施例中’此頻段係為可符合IEEE 802.11a、 IEEE802.11b/g 或 IEEE 802.11η 規範之一頻段，例如 2.4GHz至2.5GHz之間或5GHz至5.8GHz之間等等。此 外’在本實施例中’輕射早元21之内緣邊長L係貫質為 單頻天線2所操作之頻段之波長的四分之一，當然’隨著 單頻天線2之設置位置及方位’内緣邊長L可稍微增加或 減少，以得到單頻天線2之最佳效能。 200905989 於此需注意者，熟悉天線技術領域者皆知道天線之操 作頻段與其尺寸有關，且尺寸可依所需要之操作頻段作調 整，例如依據各頻段之共振路徑長度係為操作頻段之波長 的四分之一或二分之一之原則來調整天線之尺寸。換言 之，當天線尺寸改變時，其操作頻段即會隨之改變，反之 亦然。 另外，為了達到空間分集以及輻射場型分集之效果， 可使複數個單頻天線2搭配操作。如圖5所示，一種天線 模組係由例如二個單頻天線2所構成，各單頻天線2之輻 射單元21、接地單元22及饋入單元23係各自設置於基板 24之二個角落。為方便說明，故將其中一單頻天線2稱為 左天線2a，另一單頻天線2稱為右天線2b。 請參照圖6及圖7所示，其中，縱軸表示電壓靜態駐 波比（VSWR)，橫軸代表頻率（Frequency)。以一般業者 對於電壓靜態駐波比小於2.5即可接受的定義，可以觀察 到本發明較佳實施例之左天線2a及右天線2b可操作於 2.4GHz 至 2.5GHz 之間。 請參照圖8至圖10所示，其係顯示本實施例之左天 線2a操作於上述頻段之輻射場型圖的量測結果；其中，圖 8至圖10依序為左天線2a操作於2.4GHz、2:45GHz及 2.5GHz之輻射場型圖的量測結果。請參照圖11至圖13， 其係顯示本實施例之右天線2b操作於上述頻段之輻射場 型圖的量測結果；其中，圖11至圖13依序為右天線2b 操作於2.4GHz、2.45GHz及2.5GHz之輻射場型圖的量測 200905989 結果。此外，經過多次的測試及驗證，本實施例藉由輻射 單元21之彎折部211，可大幅提升左天線2a及右天線2b 之電感電容效應，使得接地單元22及饋入單元23之間距 D (如圖2所示）能夠較習知技術來得短。 綜上所述，因依據本發明之一種單頻天線之輻射單元 係具有一彎折部，故與習知技術相較，在相同的共振路徑 下，本發明之輻射單元的長度可相對地縮短，進而使單頻 天線小型化；此外，本發明藉由輻射單元之彎折部，可大 幅提升單頻天線之電感電容效應，即在設計上，單頻天線 之饋入單元及接地單元之間距不需太大，可較習知技術縮 短，進而減少設計上的限制，並提升天線的適應性及效 能。另外，本發明之單頻天線之接地單元及饋入單元可以 表面黏著技術連接於電路板，故可簡化天線製程並提升整 體結構強度。 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1為一種習知單頻天線之一示意圖； 圖2為依據本發明較佳實施例之單頻天線之一示意 圖， 圖3為依據本發明較佳實施例之單頻天線設置於一基 板之一示意圖； 11 200905989 圖4為依據本發明較佳實施例之單頻天線，其中接地 單元及饋入單元設置於基板之一示意圖； 圖5為依據本發明較佳實施例之二個單頻天線共同操 作之示意圖； 圖6為依據本發明較佳實施例之左天線之電壓靜態駐 波比之一量測圖； 圖7為依據本發明較佳實施例之右天線之電壓靜態駐 \ 波比之一量測圖； # 圖8至圖10依序為本發明較佳實施例之左天線操作 於2.4GHz、2.45 GHz及2.5 GHz之輻射場型圖；以及 圖11至圖13依序為本發明較佳實施例之右天線操作 於2.4GHz、2.45 GHz及2.5 GHz之輻射場型圖。 【主要元件符號說明】 1、2 單頻天線 11、21 輻射單元 12、23 饋入單元 13、22 接地單元 2a 左天線 2b 右天線 211 彎折部 212 端部 221 接腳 231 連接墊 24 基板 241 接地區 242 孔洞 243 連接墊 25 導電單元 251 導電體 252 接地導體 253 第一絕緣層 254 第二絕緣層 D 間距 12 200905989 L 内緣邊長Electronic Engineers, IEEE) 2_4GHz of the 802.llb/g specification, or 5GHz conforming to the ffiEE 802.11a specification, etc. However, in design, in order to make the inductance-capacitance effect of the single-frequency antenna 1 more obvious, it is necessary to make the distance between the feeding unit 12 and the grounding unit 13 exceed a certain length, for example, 3 mm, but this also becomes the design of the single-frequency antenna 1 A limitation on the configuration of the previous and future. Further, the radiation unit 11 of the single-frequency antenna 1 is elongated, and as a whole, the length of the single-frequency antenna 1 is too long, which is disadvantageous for the demand for "miniaturization", especially in the case where the operating frequency band is low frequency. Therefore, how to provide a miniaturized single-frequency antenna and reduce the design limitation, thereby improving the adaptability and performance of the antenna, is one of the important topics. [Invention] In view of the above problems, the object of the present invention is to provide A single-frequency antenna that is miniaturized and reduces design constraints to improve adaptability and overall performance. For the above purpose, a single frequency antenna according to the present invention comprises a radiating element, a grounding unit, a feeding unit and a conducting unit. The light-emitting unit has a bent portion; the grounding unit and the feeding unit are protruded from one end of the radiating unit, and the grounding unit and the feeding unit have a spacing; the conductive unit has a conductive body and a grounding The conductor, the conductive system is electrically connected to the feeding unit, and the grounding guiding system and the grounding unit are electrically connected. According to the above, the radiating unit of the single-frequency antenna according to the present invention has a bent portion, and the bent portion can be In the form of a hook, a right angle or an arc, etc., the length of the radiating element of the present invention can be relatively shortened under the same resonance path, thereby miniaturizing the single-frequency antenna; The invention can greatly improve the inductance and capacitance effect of the single-frequency antenna by using the bent portion of the radiating unit, that is, in design, the distance between the feeding unit and the grounding unit of the single-frequency antenna can be shortened compared with the prior art, thereby reducing the design. Limiting and improving the adaptability and performance of the antenna; further, the present invention can be disposed on a substrate by the radiating unit, and the grounding unit and the feeding unit are directly disposed on the substrate More conducive to miniaturization of products designed and manufactured to reduce costs. In addition, the grounding unit and the feeding unit of the single-frequency antenna of the present invention can be connected to the circuit board by surface adhesion technology, thereby simplifying the antenna manufacturing process and improving the overall structural strength. [Embodiment] Hereinafter, a single-frequency antenna according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein like elements will be described with the same reference numerals. Referring to FIG. 2, a single frequency antenna 2 according to a preferred embodiment of the present invention includes a radiating element 21, a grounding unit 22, and a feeding unit 23. The radiation unit 21 has a bent portion 211. In the embodiment, the radiating unit 21 is a metal flat plate, and the bent portion 211 can be hook-shaped, right-angled or curved, etc. The grounding unit 22 and the feeding unit 23 are protruded from one end portion 212 of the radiating unit 21, and the grounding 7 200905989 unit 22 and the feeding unit 23 have a spacing D, in this embodiment. In the middle, the spacing D is less than 3 mm. For example, as shown in FIG. 3, the single frequency 夭βσ __ , the dry antenna 2 further includes a substrate 24, and the radiation element 21 is disposed on the substrate 24 by the grounding unit 7 ρ ^... and the feeding unit 23 . The substrate 24 is a stamp|丨|. "Brushing the circuit board. The substrate 24 has a connection area 241 'Korean unit 21 俜 垃 垃 垃 垃 241 241 241 241 241 241 241 241 241 241 241 241 241 241 241 241 241 241 241 241 It is disposed at the edge or corner of the substrate 24. In the present embodiment, the grounding unit Μ and the feeding unit Μ have a plurality of kinds of sad samples placed on the substrate 24 by Dx. For example, the grounding unit 22 has a pin 221, a pin The 221 is inserted into the substrate Μ, of course, the substrate Μ also has a corresponding hole 242 for the pin 221 to be inserted; or the feeding unit 23 has a connection pad 231 'the connection pad 231 is soldered to the substrate one of the connection pads 243. Here, the connection pad 231 can be adhered to the connection pad 243 of the substrate 24 by surface adhesion technology (SMT). Of course, the grounding unit 22 can also be soldered to the substrate 24 by using a connection pad; or The feed unit 23 can be inserted into the substrate 24 by using a pin. Further, the single-frequency antenna 2 of the embodiment can be disposed in an electronic device, such as a notebook computer, a mobile communication device, or a personal digital assistant (Personal Digital). Assistant PDA), etc.; of course, the single-frequency antenna 2 of the present embodiment can also be applied to other electronic devices that require an antenna, such as a network interface with a PCMCIA (Personal Computer Memory Card International Association) interface. Card or CF (CompactFlash) interface card. Of course, if under the specific 200905989 specification, for example, under the IEEE 802.11n specification, three antennas are required for multiplex processing, the single-frequency antenna 2 can also be used with other The antenna works in conjunction with a plurality of single-frequency antennas 2. As shown in FIG. 4, the grounding unit 22 and the feeding unit 23 are disposed on the substrate 24. In addition, the single-frequency antenna 2 further includes A conductive unit 25, such as but not limited to a coaxial transmission line. As shown in FIG. 4, the conductive unit 25 has a conductor 251 and a ground conductor 252. The conductor 251 is electrically connected to the hall entrance unit 23, The grounding conductor 252 is electrically connected to the grounding unit 22. The grounding conductor 252 can be directly or indirectly electrically connected to the grounding unit 22, for example, the grounding conductor 252 can be connected to the grounding area 2 41 is electrically connected, and is indirectly connected to the grounding unit 22. Further, the conductive unit 25 further has a first insulating layer 253 and a second insulating layer 254, wherein the first insulating layer 253 is disposed on the conductive body 251 and the ground. The conductors 252 are separated from each other by an electrical signal, and the second insulating layer 254 is disposed on the outermost layer of the conductive unit 25 for insulation and protection. The 'single-frequency antenna 2 is operated in a frequency band by the radiating unit 21, and in this embodiment, the frequency band is one of the bands conforming to the IEEE 802.11a, IEEE 802.11b/g or IEEE 802.11n specifications. For example, between 2.4 GHz and 2.5 GHz or between 5 GHz and 5.8 GHz, and the like. In addition, in the present embodiment, the inner edge length L of the light-emitting early element 21 is one quarter of the wavelength of the frequency band operated by the single-frequency antenna 2, of course, 'with the setting position of the single-frequency antenna 2 And the orientation 'inner edge length L can be slightly increased or decreased to obtain the best performance of the single frequency antenna 2. 200905989 It should be noted that those skilled in the field of antenna technology know that the operating frequency band of the antenna is related to its size, and the size can be adjusted according to the required operating frequency band. For example, the resonant path length according to each frequency band is the wavelength of the operating frequency band. One or one-half of the principle is used to adjust the size of the antenna. In other words, when the antenna size changes, its operating frequency band changes, and vice versa. In addition, in order to achieve the effects of spatial diversity and radiation field diversity, a plurality of single frequency antennas 2 can be operated in combination. As shown in FIG. 5, an antenna module is composed of, for example, two single-frequency antennas 2, and the radiating unit 21, the grounding unit 22, and the feeding unit 23 of each single-frequency antenna 2 are respectively disposed at two corners of the substrate 24. . For convenience of explanation, one of the single-frequency antennas 2 is referred to as a left antenna 2a, and the other single-frequency antenna 2 is referred to as a right antenna 2b. Referring to Figures 6 and 7, the vertical axis represents the voltage static standing wave ratio (VSWR) and the horizontal axis represents the frequency (Frequency). It can be observed that the left antenna 2a and the right antenna 2b of the preferred embodiment of the present invention can operate between 2.4 GHz and 2.5 GHz in a general sense that the voltage static standing wave ratio is less than 2.5. Referring to FIG. 8 to FIG. 10, the measurement results of the radiation pattern of the left antenna 2a operating in the frequency band of the present embodiment are shown; wherein, FIG. 8 to FIG. 10 sequentially operate the left antenna 2a in 2.4. Measurement results of radiation field patterns at GHz, 2:45 GHz, and 2.5 GHz. Referring to FIG. 11 to FIG. 13 , the measurement results of the radiation pattern of the right antenna 2b operating in the frequency band of the present embodiment are shown. FIG. 11 to FIG. 13 sequentially operate the right antenna 2b at 2.4 GHz. Measurement of the radiation pattern of 2.45 GHz and 2.5 GHz. In addition, after multiple tests and verifications, the present embodiment can significantly increase the inductance and capacitance effects of the left antenna 2a and the right antenna 2b by the bending portion 211 of the radiating unit 21, so that the grounding unit 22 and the feeding unit 23 are spaced apart from each other. D (as shown in Figure 2) can be shorter than conventional techniques. In summary, since the radiating element of the single-frequency antenna according to the present invention has a bent portion, the length of the radiating element of the present invention can be relatively shortened under the same resonant path as compared with the prior art. In addition, the single-frequency antenna is miniaturized; in addition, the invention can greatly improve the inductance and capacitance effect of the single-frequency antenna by the bending portion of the radiating unit, that is, the distance between the feeding unit and the grounding unit of the single-frequency antenna is designed. It does not need to be too large, which can be shortened compared with conventional techniques, thereby reducing design constraints and improving the adaptability and performance of the antenna. In addition, the grounding unit and the feeding unit of the single-frequency antenna of the present invention can be connected to the circuit board by surface adhesion technology, thereby simplifying the antenna manufacturing process and improving the overall structural strength. The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional single frequency antenna; FIG. 2 is a schematic diagram of a single frequency antenna according to a preferred embodiment of the present invention, and FIG. 3 is a single frequency according to a preferred embodiment of the present invention; FIG. 4 is a schematic diagram of a single frequency antenna in which a grounding unit and a feeding unit are disposed on a substrate according to a preferred embodiment of the present invention; FIG. 5 is a schematic view of a preferred embodiment of the present invention; 2 is a schematic diagram of a common operation of two single-frequency antennas; FIG. 6 is a measurement diagram of a voltage static standing wave ratio of a left antenna according to a preferred embodiment of the present invention; FIG. 7 is a right antenna according to a preferred embodiment of the present invention. One of the voltage static station/wave ratio measurements; # Figure 8 to Figure 10 are radiation pattern diagrams of the left antenna operating at 2.4 GHz, 2.45 GHz, and 2.5 GHz, respectively, in accordance with a preferred embodiment of the present invention; Figure 13 is a diagram showing the radiation pattern of the right antenna operating at 2.4 GHz, 2.45 GHz, and 2.5 GHz in accordance with a preferred embodiment of the present invention. [Main component symbol description] 1, 2 single-frequency antenna 11, 21 radiation unit 12, 23 feed unit 13, 22 ground unit 2a left antenna 2b right antenna 211 bent portion 212 end portion 221 pin 231 connection pad 24 substrate 241 Connection area 242 hole 243 connection pad 25 conductive unit 251 conductor 252 ground conductor 253 first insulation layer 254 second insulation layer D spacing 12 200905989 L inner edge length