M349562 八、新型說明： 【新型所屬之技術領域】 本新型是有關於一種天線，特別是指一種數位電視天 線。 【先前技術】 隨著行動裝置（notebook、手機、pda…等）之普及， 行動裝置所配備之功能日益增多，透過行動裝置來觀看數 位電視漸漸成為其附加之功能’數位電視的走向越來越趨 於行動化，以期帶給使用者更多元且更便捷的生活，因此 全球各國積極投入電視廣播數位化的發展，像是攜帶型數 位電視棒（USB dongle)這種較小型隨插即用裝置的數位電 視調諧器（DTV tuner)或是整合多媒體及衛星導航功能的手 持電視機，都將會是使用者能隨時隨地收看電視的最佳選 擇。 使用數位電視功能時需搭配數位電視之天線使用，才 能有效地接收到數位電視之訊號，而隨著電子產品之設計 概念越來越強調整合性及輕薄短小之功能，因此在設計數 位電視天線時，往往須將天線尺寸縮小，使其成為一小巧 之數位電視模組或可隱藏於行動裝置内，故天線之小型化 成為設計數位電視天線時之重要考量；但數位電視接收天 線，受限於數位電視操作頻帶範圍不僅要低且頻寬也要大 ，往往不容易設計出接收性能好且體積小的天線。 現今台灣市售之可德士 攜式數位電視產品、車用數位電視 機或數位電視調譜器，其所附之天線在尺寸上尚不夠輕薄 5 M349562 短小，在在多為立體式單極天線（m〇n〇p〇ie antenna )、迴圈 天線（loop antenna)或是偶極天線（dipole antenna)，對使 用者來說，非常占空間且攜帶不便。其中迴圈天線之阻抗 頻寬較單極天線較為狹窄，無法達成良好的接收效果；而 傳統偶極天線需要在中間饋入，在可攜式產品或是汽車用 天線的配置上，必需要以一定長度之訊號線饋入天線再連 接至接收機之射頻端。 【新型内容】 因此本新型之目的，即在提供一種小型化的數位電 視天線。 於疋，本新型數位電視天線包含：具有相反的一第一 ，面及一第二表面的一基板、一設於該第-表面上的接地 邛及一设於該第二表面上的天線本體；該天線本體包括 •一饋入段、一設於該饋入段之一側的第一曲折段，及一 又於該饋入段之另一側的第二曲折段；該饋入段具有一第 一端部、一第二端部’及一位於該第一端部的饋入點用以 作訊號饋入，該第-曲折段由該第二端部朝該饋入點方向 折地延伸，而该第二曲折段由該第二端部朝該饋入點方 向曲折地延伸。 較佳地，該第-曲折段與該第二曲折段是以連續3型 ^斤狀朝該饋人點婉蜒地延伸，並且為兩長度相近的 線段。 构型之功效在於利用第一曲折段與第二曲折段激發 目鄰近的模態，以在有限的體積限制中產生足夠之頻 6 M349562 寬，並且還可藉由調整第—曲折段與第二曲折段的長度與 曲折數目以調整組抗匹配。 【實施方式】 有關本新型之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 ， 本新型數位電視天線是以現今台灣所開放的超高頻（ UHF)頻段（533 MHz〜599 MHz)為主，並且期望以小型化、 易於攜帶為訴求，因此採用繞線天線（meandeMine antenna )與單極天線（monopole antenna)兩基本理論來設計此天 線。 圖1、圖2及圖3分別為本新型數位電視天線之一較佳 實施例的側視圖、俯視圖以及仰視圖，本實施例包含一基 板1 ’及分設於基板1之兩面的接地部2與天線本體3。 參閱圖1，本實施例中，基板i是長為5〇 mm，寬為 _ 21_5 mm ,厚度則為L6 mm的FR4玻璃纖維基版（介電係 數4.4 )’且具有相反且互相平行的一第一表面11及一第二 表面12 ;而用以接地的接地部2是設於第一表面u上，天 線本體3則是設於第二表面12上。本實施例之基板丨之材 質並不以玻璃纖維板（FR4)為限’也可以使用其它介質材料 〇 參閱圖2，該天線本體3包括：一長條形狀的饋入段 33、一設於該饋入段33之一側的第一曲折段3丨，及一設於 該饋入段33之另一側的第二曲折段32;該饋入段；33具有 7 M349562 相反的-第一端部331與一第二端部332，饋入段μ還具 有位在該第-端部331的饋入點333用以與饋入線（圖未 示）電連接，可供訊號饋入。 該第一曲折段31由第二端部332以連續s型的彎折狀 朝饋入，點333方向婉蜓地延伸，而該第三曲折段32亦類似 於第一曲折段31 ’由第二端部332以連續S型彎折狀朝饋 入點333方向蜿蜒地延伸。需要注意的是，第一曲折段 與第二曲折段32並非對齊地並列於饋入段33的兩侧，而 是相互錯開一定距離地列在饋入段33的兩側，亦即第一曲 折段31與第二曲折段32的起始點並非同一點而是相錯開 ，並且第二曲折段32的末端比第一曲折段末端稍微接近該 饋入點333。 在繞線天線的設計原理中，第一曲折段3丨與第二曲折 段32的線寬視為電感’兩線的間隔則可視為電容，故以連 續S型彎折的第一曲折段η與第二曲折段32可視為由許 多電容、電感所組成的等效電路，因此，調整兩曲折段31 、32的長度’使得天線曲折數增減，即等於調整電感與電 容的並聯數目，利用這方式可以微調阻抗匹配並有效縮小 天線的尺寸；再者，還可藉由調整饋入段33與兩曲折段31 、32的間距以使天線的特性阻抗為50歐姆，以達成良好的 阻抗匹配。 參閱圖3，該接地部2設於該第二曲折段32的末端與 該饋入點333之間，並位在基板1的第二表面12。 本新型數位電視天線之較佳實施例實際尺寸請參閱參 M349562 閱圖4、圖5及圖6’並對照表1，圖4、圖5及圖6所示 為本實施例的侧視圖、俯視圖及仰視圖，表1中數字的單 位為mm，可參閱各項數據以得知本實施例的實際規格尺寸 L*3 50+3 L2^ IP 21.543 W2*> 1如 L3^ Ιί+ϊ 卿 0.5+5 Ls^M349562 VIII. New Description: [New Technology Field] This new type is related to an antenna, especially a digital TV antenna. [Prior Art] With the popularity of mobile devices (notebooks, mobile phones, pdas, etc.), mobile devices are increasingly equipped with functions. Watching digital TVs through mobile devices is becoming an additional function. It is moving towards action, in order to bring more yuan and more convenient life to users, so countries around the world are actively engaged in the development of digital broadcasting of TV broadcasts, such as the portable plug-and-play type of USB dongle. The device's digital TV tuner (DTV tuner) or handheld TV with integrated multimedia and satellite navigation will be the best choice for users to watch TV anytime, anywhere. When using the digital TV function, it needs to be used with the antenna of the digital TV to effectively receive the signal of the digital TV. As the design concept of the electronic product increasingly emphasizes the integration and the function of lightness and thinness, when designing the digital TV antenna It is often necessary to reduce the size of the antenna to make it a compact digital TV module or can be hidden in the mobile device. Therefore, the miniaturization of the antenna is an important consideration when designing a digital TV antenna; however, the digital television receiving antenna is limited by The digital TV operating band range is not only low but also has a large bandwidth, and it is often difficult to design an antenna with good reception performance and small size. Nowadays, the Keds portable digital TV products, digital TV sets for televisions or digital TV modems are available in Taiwan. The attached antenna is not thin enough in size. 5 M349562 is short, and is mostly a stereo monopole antenna. (m〇n〇p〇ie antenna), loop antenna or dipole antenna is very space-consuming and inconvenient for the user. The impedance bandwidth of the loop antenna is narrower than that of the monopole antenna, and the receiving effect cannot be achieved. The conventional dipole antenna needs to be fed in the middle. In the configuration of the portable product or the antenna for the automobile, it is necessary to A signal line of a certain length is fed into the antenna and then connected to the RF end of the receiver. [New content] Therefore, the object of the present invention is to provide a miniaturized digital television antenna. The digital television antenna of the present invention comprises: a substrate having an opposite first surface, a second surface, a grounding layer disposed on the first surface, and an antenna body disposed on the second surface The antenna body includes: a feed-in section, a first meandering section disposed on one side of the feeding section, and a second meandering section on the other side of the feeding section; the feeding section has a first end portion, a second end portion and a feeding point at the first end portion for signal feeding, the first tortuous portion being folded from the second end portion toward the feeding point Extending, the second meandering segment extends in a meandering manner from the second end toward the feed point. Preferably, the first meandering segment and the second meandering segment extend in a continuous pattern of 3 to the donor, and are two segments of similar length. The effect of the configuration is to utilize the first meandering segment and the second meandering segment to excite the modality adjacent to the eye to produce a sufficient frequency 6 M349562 width in a limited volume limit, and also by adjusting the first tortuous segment and the second The length of the meandering segment and the number of tortuous segments are adjusted to match the group resistance. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments. This new digital TV antenna is based on the ultra-high frequency (UHF) frequency band (533 MHz to 599 MHz) that is open in Taiwan today, and is expected to be miniaturized and easy to carry. Therefore, a wire-wound antenna (meandeMine antenna) is used. This basic antenna is designed with two basic theories of monopole antennas. 1 , 2 , and 3 are respectively a side view, a top view, and a bottom view of a preferred embodiment of a digital television antenna. The present embodiment includes a substrate 1 ′ and ground portions 2 disposed on both sides of the substrate 1 . With the antenna body 3. Referring to FIG. 1, in the embodiment, the substrate i is an FR4 glass fiber substrate (dielectric coefficient 4.4) having a length of 5 mm, a width of _21_5 mm, and a thickness of L6 mm and having opposite and parallel to each other. The first surface 11 and the second surface 12; the grounding portion 2 for grounding is disposed on the first surface u, and the antenna body 3 is disposed on the second surface 12. The material of the substrate of the embodiment is not limited to the fiberglass board (FR4). Other dielectric materials may be used. Referring to FIG. 2, the antenna body 3 includes: a long-shaped feeding section 33, a first meandering section 3丨 on one side of the feeding section 33, and a second meandering section 32 provided on the other side of the feeding section 33; the feeding section; 33 has 7 M349562 opposite-first end The feeding portion 333 and the feeding portion 333 further have a feeding point 333 at the first end portion 331 for electrically connecting with a feeding line (not shown) for feeding the signal. The first meandering section 31 is fed by the second end portion 332 in a continuous s-shaped bending shape, and the point 333 is extended in a direction, and the third tortuous section 32 is also similar to the first tortuous section 31'. The two end portions 332 extend in a continuous S-shaped bent shape toward the feed point 333. It should be noted that the first meandering section and the second meandering section 32 are not aligned with each other on both sides of the feeding section 33, but are arranged at a distance from each other on both sides of the feeding section 33, that is, the first tortuous section. The starting point of the segment 31 and the second meandering segment 32 are not the same point but are staggered, and the end of the second meandering segment 32 is slightly closer to the feeding point 333 than the end of the first meandering segment. In the design principle of the wound antenna, the line width of the first meandering section 3丨 and the second meandering section 32 is regarded as the inductance. The interval between the two lines can be regarded as a capacitance, so the first meandering section η is bent by a continuous S-shape. The second meandering segment 32 can be regarded as an equivalent circuit composed of a plurality of capacitors and inductors. Therefore, adjusting the lengths of the two meandering segments 31 and 32 increases or decreases the number of turns of the antenna, that is, equals the number of parallel connections of the inductor and the capacitor. This method can fine-tune the impedance matching and effectively reduce the size of the antenna; furthermore, the impedance of the antenna can be adjusted to 50 ohms by adjusting the spacing between the feeding section 33 and the two meandering segments 31, 32 to achieve good impedance matching. . Referring to FIG. 3, the grounding portion 2 is disposed between the end of the second meandering segment 32 and the feed point 333 and is located on the second surface 12 of the substrate 1. For the actual size of the preferred embodiment of the digital television antenna, please refer to Figure 4, Figure 5 and Figure 6' and refer to Table 1, and Figure 4, Figure 5 and Figure 6 show the side view and top view of the present embodiment. And the bottom view, the unit of the number in Table 1 is mm, can refer to the data to know the actual size of the embodiment L*3 50+3 L2^ IP 21.543 W2*> 1 such as L3^ Ιί+ϊ 卿0.5+5 Ls^
表1 參閱圖2㈣7，本實施例利用長度相似且彼此些微錯 開的第-曲折段31與第二曲折段32,激發出兩相鄰之模態 以獲得足夠的工作頻寬，經實驗結果可知，共振中心頻率 約為 567 MHZ時，本實施例於 530 MHz〜605 MHz的頻段内 ，其反射損失皆小於-7.5 dB，符合天線工作之需要，並且 其頻寬也涵蓋台灣所開放的超高頻頻段（533 MHz〜599 mHz) ο 本實施例其輻射場型（Radiati〇n Pattern)，如圖8所示， 是本實施例工作於556 MHz時，在γ_ζ平面的輻射場型量 測結果，纟圖中可得知，本實施例具有良好的全方向性（ Ο—· direCti〇nal )，意即擁有良好的平行極化特性，使得收 訊的品質提昇。 综合以上所述，本新型之功效在於利用第-曲折段31 與第二曲折段32激發出兩相鄰近的模態，以在有限的體積 9 M349562 限制中產生適用於接收數位電視訊號所需要的足夠工作頻 見，並且還可調整第一曲折段31與第二曲折段32的長度 與曲折數目藉以調整阻抗匹配，本新型確實可達成應用= 數位電視中的天線小型化，以利設置於行動電子產品中。 惟以上所述者，僅為本新型之較佳實施例而已，當不 能以此限定本新型實施之範圍，即大凡依本新型申請專利 範圍及新型說明内容所作之簡單的等效變化與修飾，皆仍 屬本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1疋本新型數位電視天線的一較佳實施例的侧視圖 9 圖2是本實施例的俯視圖，繪示本實施例的天線本體 構造； 圖3是本實施例的仰視圖，繪示本實施例的接地部構 造； 圖4、圖5及圖6可搭配表1觀看，其繪示本實施例的 實際規格尺寸； 圖7是一數據圖，顯示本實施例的反射損失測結果； 及 圖8是一數據圖，顯示本實施例工作於高頻頻段中的 567 MHz時，在yZ平面的輻射場型量測結果；。 10 M349562 【主要元件符號說明】 1 ..........基板 11 .........第一表面 12 .........第二表面 2 ..........接地部 3 ..........天線本體 第一曲折段 32.........第二曲折段 33· 331 332 333 333 饋入段 第一端部 第二端部 饋點 31Referring to FIG. 2 (four) 7, this embodiment utilizes the first tortuous section 31 and the second tortuous section 32 which are similar in length and slightly offset from each other to excite two adjacent modes to obtain a sufficient working bandwidth, and the experimental results show that When the resonance center frequency is about 567 MHZ, the reflection loss of this embodiment is less than -7.5 dB in the frequency range of 530 MHz to 605 MHz, which is in line with the needs of antenna operation, and its bandwidth also covers the UHF opened in Taiwan. Frequency band (533 MHz to 599 mHz) ο The radiation pattern (Radiati〇n Pattern) of this embodiment, as shown in FIG. 8, is the measurement result of the radiation field type in the γ_ζ plane when the embodiment operates at 556 MHz. As can be seen from the figure, this embodiment has good omnidirectionality (Ο-·direCti〇nal), which means that it has good parallel polarization characteristics, which improves the quality of the reception. In summary, the effect of the present invention is to utilize the first tortuous section 31 and the second meandering section 32 to excite two adjacent modalities to produce a suitable volume for receiving a digital television signal in a limited volume 9 M349562 limit. Sufficiently working, and adjusting the length of the first meandering section 31 and the second meandering section 32 and the number of tortuous points to adjust the impedance matching, the present invention can achieve the application = miniaturization of the antenna in the digital television to facilitate the setting in action In electronic products. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a preferred embodiment of a digital television antenna of the present invention. FIG. 2 is a plan view of the present embodiment, showing the antenna body structure of the present embodiment; FIG. The bottom view shows the structure of the grounding portion of the embodiment; FIG. 4, FIG. 5 and FIG. 6 can be viewed together with Table 1, which shows the actual size of the embodiment; FIG. 7 is a data diagram showing the embodiment. The reflection loss measurement result; and FIG. 8 is a data diagram showing the radiation field type measurement result in the yZ plane when the embodiment operates at 567 MHz in the high frequency band; 10 M349562 [Description of main component symbols] 1 .......... Substrate 11 ......... First surface 12 ......... Second surface 2 ... .......the grounding part 3 ..........the antenna body first meandering section 32...the second meandering section 33·331 332 333 333 feeding section One end second end feed point 31