1259605 九、發明說明： 【發明所屬之技術領域】 本發明係有關於一種天線，特別是有關於一種數位電 視接收天線。 【先前技術】 一般傳統的類比電視廣播（Analog Television Broadcasting) ，採用的是 NTSC (National Television Standard Committee)系統， ® 以類比訊號的型式將電視訊號傳送到用戶端。但連續性變 化的類比訊號，較易在傳送過程中受到雜訊的干擾，而產 生用戶端有時電視晝面模糊，或出現雪花、鬼影等現象。 而數位電視廣播（Digital Television Broadcasting )，乃是將類比 電視訊號轉換成數位電視訊號的電視廣播系統。由於廣播 訊號的數位化，因此可使用一些訊號處理的方式除去數位 訊號在傳送過程中所累積的雜訊，如此可大幅的提高用戶 • 端的接收訊號品質。並且藉由將數位訊號在傳輸前先行壓 縮的過程，可增加頻寬的使用效率。目前全球數位電視地 面廣播共有三套技術標準，分別為：美國的ATSC (Advanced Television Systems Committee)、及歐洲的 DVB-T (Digital Video Broadcasting-Terrestrial) 、日本的 ISDB-T (Terrestrial Integrated Services Digital Broadcasting) 。 而由於 歐規的 DVB-T 傳輸系 統採用 COFDM (Coded Orthogonal Frequency Division)調變方式，具有可 行動接收（Mobile Reception)、抗多重路徑干擾（Anti-multipath) Ϊ259605 月匕力強、可配合單頻網路（STN，Single Fre科㈣Netw〇rk)的配 置以及室内訊號接收能力較佳的特點。因此中華民國政府 雖於民國87年宣佈採用美規系統，但已於從民國9〇年6月 起改制採用歐洲的DVB-丁系統。 適用於一般用戶以及車輛上的數位電視接收天線，由 於天線具有較大的擺置空間，目前已有相當多的設計技術 出現。但對於著重於外型輕巧的攜帶式數位電視（p〇rtabie • DTV恤㈣或多媒體播放裝置(PMP，Portable Media Player)，想 要設計出結構簡單、外型輕巧又能完全涵蓋數位電視頻道 (470〜806MHz)的數位電視接收天線，其設計的困難度相對 大幅的提高。台灣新型專利專利號第M269,583號，，數位電 視天線"，其揭示一種數位電視接收天線，該天線不但結 構複雜且天線操作頻寬不足，無法完全涵蓋數位電視頻道 (70 806 MHz)，使其在貫際運用上之實用性較低。及台灣 新3L專利第M270,510號π設有天線之數位電視接收盒，，， ’其揭不一種數位電視接收天線，該天線操作時，其尺寸過 長，在貫際應用上為一缺點。為解決這些問題，我們提出 種創新的數位電視接收天線設計，不僅可產生一寬頻操 作頻寬完全涵蓋數位電視頻道(47〇〜8〇6ΜΗζ)，同時本發明 天線^構簡單、製作容易、外型輕巧，相當適合應用於各 種攜帶式數位電視或多媒體播放裝置。 【發明内容】 本發明之目的在於提供一種創新數位電視接收天線的 7 1259605 設計，不僅可以產生-操作頻寬完全涵蓋於數位電視頻道 (470〜806MHz)，同時本發明天線結構簡單、製作容易、外 型輕巧，相當適合應用於各種攜帶式數位電視或多媒體播 放裝置。 本發明天線之一實施例1，包括：-系統接地面、-輻射金屬片、一匹配電路以及一短路金屬線。該輕射金屬 月，大致為一長條狀，與該系統接地面大致呈九十度之夾 角，亚與該系統接面具有一預設距離之間距。該匹配電路 包3::第-連接金屬#，其—端為該天線的訊號饋入點 ;一第二連接金屬#，其—端與該輻射金屬片電氣連接； 以及-電容元件’其-端與該第—連接金屬片電氣連接， 另:端與該第二連接金屬片電氣連接。該短路金屬線，其 一端與该系統接地面電氣連接，另一端則與該輻射金屬片 電氣連接。 本發明的實驗結果顯示，本發明之一實施例丨可完全 涵蓋數位電視頻道(47〇〜8〇6ΜΗζ)，且天線輻射場型與增益 可符合數位電視接收天線之實際應用。 曰 、在本員叹σ十中，使用一結構簡單之長條狀輻射金屬片 為天線主體，並在天線訊號饋入端置入一匹配電路，藉由 凋正/、中屯谷元件之電容值，來達成補償天線虛部阻抗的 用進而產生一適用於數位電視頻道（4 70〜806 MHz)需 求之見頻操作頻寬，同時本發明天線結構簡單、製作容易 、外型輕巧’相當適合應用於各種攜帶式數位電視或多媒 體播放裝置。 1259605 配合下列圖示、實施例之詳細說明及申請專利範圍， 將上述本發明之其他目的與優點詳述於後。 【實施方式】 第1圖為本發明天線之一實施例1結構圖，包含：一 系統接地面11，一輻射金屬片12，一匹配電路13，以及一 短路金屬線14。該輻射金屬片12，大致為一長條狀，與該 •系統接地面11大致呈九十度之失角，並與該系統接面^ 有一預設距離之間距d，該預設距離之間距d 一般小於2 公分。該匹配電路13包含：一第一連接金屬片132，其一 端為該天線的訊號饋入點131 ; 一第二連接金屬片π3、， 其一端與該輻射金屬片12電氣連接；以及一電容元件134 丄其一端與該第一連接金屬片132電氣連接，另一端與該 第二連接金屬片133電氣連接。該短路金屬線14，盆一端 =系統接地面η電氣連接，另—端則與該輻射金屬片12 >包氣連接。該系統接地面Η、該輸入匹配電路Η之兮第一 連接金屬片U2與該第二連接金屬片133及短路金屬'線14 係=刷或餘刻技術形成於-介質基板上。本發明天線主 要是藉由在天線訊號饋入端内㈣置入一匹配電㉟，並調整 ，中電容元件之電容值’來達成補償天線短路金屬線所= =線輸入電抗的作用，進而得到—適用於數位 道需求之寬頻操作頻寬。 、 弟2 A及2B圖為本發明天線應用於崔 狀要^ ▼式多媒體播放 衣置（驗，Portable Media Player)於使用狀態及非使用狀態之 9 1259605 立體外觀示意圖。由於本發明天線具有相當輕巧的薄片狀 外型，使該天線不但在使用狀態時不會破壞產品的美觀。 於非使用狀態時，該天線也相當易於收藏（天線之收藏折 彎基準線如第1A ®中所示之基準線15)。因此本發明天 線相當容易配合商業的目的完成各種造型設計，以達成美 觀之效果。 第3圖為本發明天線一實施例j之返回損失㈣拉 loss)實驗量測結果圖，本實施例選擇下列尺寸進行實驗量 測：該系統接地面11長度為120mm、寬度為55麵，該輻 射金屬片12長度為85mm、寬度為17咖，其與系統接= 面11之預設距離之間距㈣醜，該匹配電路13之該第一 連接金屬片132長度為3mm、寬度為2mm，該第二連接金 屬片133長度為5mm、寬度為2聰，該短路金屬㈣總長 J約為33_，其兩電氣連接點之間有一大致呈九十度之 彎折處。如第2圖所示，由所得的測試結果，縱轴表^返 回損失’橫軸表示操作頻率，在數位電視頻帶内（47〇〜8〇6 MHz)，錢阻抗匹配均至少達到3 :丨vswr(㈣返回損失 2在實際應用時，此阻抗匹配位準能夠滿足數位電視訊 唬接收之要求。 第4圖與第5圖分別為為本發明天線-實施例1分別 頻率52GMWmhz之輻射場型圖。由所得 7jc平面（x_y面）的輻射場型，均大致為-全向性 fee-a㈣射場型’滿足一般數位電視頻道之應用需 1259605 、，第6圖為本發明天線一實施例1於其操作頻帶内之 圖’由所传之結果’縱轴表示天線增益，橫轴表示 呆作頻率’於數位電視頻帶内的天線增益約為Z1㈣，滿 足般數位電視頻道操作的增益需求。 、 第7Α圖本發明天線之匹配電路一第一其他實施例姓 =:包含:—連接金屬片731，其—端與該輻射金屬^1259605 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to an antenna, and more particularly to a digital television receiving antenna. [Prior Art] Generally, the conventional Analog Television Broadcasting uses the NTSC (National Television Standard Committee) system, and the analog signal is transmitted to the user terminal in the analog signal type. However, the analog signal of continuous change is more likely to be interfered by noise during the transmission process, and sometimes the user end is obscured by the TV, or snow, ghost, and the like appear. Digital Television Broadcasting is a television broadcasting system that converts analog TV signals into digital TV signals. Due to the digitization of the broadcast signal, some signal processing can be used to remove the noise accumulated by the digital signal during the transmission process, which can greatly improve the received signal quality of the user terminal. And by using the digital signal to be compressed before transmission, the bandwidth efficiency can be increased. At present, there are three sets of technical standards for digital TV terrestrial broadcasting in the world: ATSC (Advanced Television Systems Committee) in the United States, DVB-T (Digital Video Broadcasting-Terrestrial) in Europe, and ISDB-T (Terrestrial Integrated Services Digital Broadcasting in Japan). ). Since the DVB-T transmission system of the European standard adopts the COFDM (Coded Orthogonal Frequency Division) modulation method, it has Mobile Reception and Anti-multipath. Ϊ259605 Strong power, can be matched with single frequency. The configuration of the network (STN, Single Fre Division (4) Netw〇rk) and the better reception capability of the indoor signal. Therefore, although the government of the Republic of China announced the adoption of the US regulation system in 1987, it has been restructured from the Republic of China in June of the year to adopt the European DVB-Ding system. It is suitable for general users and digital TV receiving antennas on vehicles. Due to the large space of the antenna, there are quite a few design techniques. However, for portable digital TVs (p〇rtabie • DTV shirts (4) or Portable Media Players (PMP), which are designed to be lightweight, they are designed to be simple in structure, lightweight and fully cover digital TV channels ( 470~806MHz) digital TV receiving antenna, its design difficulty is relatively greatly improved. Taiwan's new patent patent number M269, 583, digital TV antenna, which reveals a digital TV receiving antenna, the antenna is not only structured Complex and insufficient antenna operation bandwidth, can not fully cover the digital TV channel (70 806 MHz), making it less practical for continuous use. And Taiwan's new 3L patent No. M270, 510 π with antenna digital TV Receive box,,, 'It does not reveal a digital TV receiving antenna. When the antenna is operated, its size is too long, which is a disadvantage in the application. To solve these problems, we propose an innovative digital TV receiving antenna design. Not only can a wide-band operation bandwidth be fully covered by digital TV channels (47〇~8〇6ΜΗζ), but the antenna of the present invention is simple and easy to manufacture. The invention is suitable for various portable digital televisions or multimedia playing devices. SUMMARY OF THE INVENTION The object of the present invention is to provide an innovative digital television receiving antenna 7 1259605 design, which can not only generate-operating bandwidth completely covered by The digital television channel (470~806MHz), and the antenna of the invention has the advantages of simple structure, easy manufacture and light weight, and is suitable for being applied to various portable digital televisions or multimedia playing devices. One embodiment of the antenna of the present invention comprises: - system a ground plane, a radiating metal piece, a matching circuit, and a short-circuited metal wire. The light-emitting metal moon is substantially a long strip, and is substantially at an angle of ninety degrees to the ground plane of the system, and the junction with the system has a predetermined distance between the distances. The matching circuit package 3:: the first connection metal #, the end is the signal feed point of the antenna; the second connection metal #, the end is electrically connected to the radiation metal piece; And - the capacitive element 'the end thereof is electrically connected to the first connecting metal piece, and the other end is electrically connected to the second connecting metal piece. The shorting metal wire, One end of the system is electrically connected to the grounding surface of the system, and the other end is electrically connected to the radiating metal piece. The experimental results of the present invention show that one embodiment of the present invention can completely cover a digital television channel (47〇8-8〇6,), And the radiation field type and gain of the antenna can meet the practical application of the digital TV receiving antenna. 曰 In our sigh, a simple strip of radiating metal piece is used as the antenna main body, and the antenna signal feeding end is placed. Into a matching circuit, by compensating the capacitance of the imaginary part of the antenna by the capacitance value of the positive/middle and valley elements, thereby generating a frequency of operation bandwidth suitable for the demand of the digital television channel (4 70 to 806 MHz) At the same time, the antenna of the invention has the advantages of simple structure, easy manufacture and light appearance, and is quite suitable for use in various portable digital televisions or multimedia playback devices. 1259605 The other objects and advantages of the present invention described above will be described in detail with reference to the accompanying drawings and claims. [Embodiment] FIG. 1 is a structural view of an embodiment 1 of an antenna according to the present invention, comprising: a system ground plane 11, a radiating metal piece 12, a matching circuit 13, and a short-circuit metal wire 14. The radiant metal piece 12 is substantially in the shape of a strip, and is substantially at a 90-degree angle with the system ground plane 11 and has a predetermined distance d from the system interface. The distance between the preset distances is d is generally less than 2 cm. The matching circuit 13 includes: a first connecting metal piece 132, one end of which is a signal feeding point 131 of the antenna; a second connecting metal piece π3, one end of which is electrically connected to the radiating metal piece 12; and a capacitive element One end of the 134 is electrically connected to the first connecting metal piece 132, and the other end is electrically connected to the second connecting metal piece 133. The short-circuited metal wire 14, the one end of the basin = the system ground plane η is electrically connected, and the other end is connected to the radiation metal sheet 12 > The system ground plane Η, the input matching circuit Η, the first connection metal piece U2 and the second connection metal piece 133 and the short-circuit metal 'line 14 system are formed on the dielectric substrate. The antenna of the present invention mainly achieves the function of compensating the short-circuited metal wire of the antenna == line input reactance by placing a matching electric 35 in the antenna signal feeding end (4) and adjusting the capacitance value of the middle capacitive element. - Broadband operating bandwidth for digital demand. The brothers 2 A and 2B are the schematic diagrams of the 1 1259605 stereoscopic appearance of the antenna used in the present invention for the use of the Cui-like multimedia playback device (Checkable, Portable Media Player) in the use state and non-use state. Since the antenna of the present invention has a relatively lightweight sheet-like shape, the antenna does not deteriorate the aesthetics of the product not only in the state of use. In the non-use state, the antenna is also quite easy to store (the antenna's collection bend reference line is shown as reference line 15 in 1A®). Therefore, the antenna of the present invention is quite easy to perform various styling designs for commercial purposes to achieve an aesthetic effect. FIG. 3 is a diagram showing the experimental results of the return loss (four) pull loss of the antenna of the embodiment j of the present invention. In this embodiment, the following dimensions are selected for the experimental measurement: the ground plane 11 of the system has a length of 120 mm and a width of 55 faces. The length of the radiating metal piece 12 is 85 mm and the width is 17 coffee. The distance between the predetermined distance of the system and the surface 11 is (4). The length of the first connecting metal piece 132 of the matching circuit 13 is 3 mm and the width is 2 mm. The second connecting metal piece 133 has a length of 5 mm and a width of 2, and the short-circuited metal (4) has a total length J of about 33 mm, and a substantially ninety-degree bend between the two electrical connection points. As shown in Fig. 2, from the obtained test results, the vertical axis table returns the loss. The horizontal axis represents the operating frequency. In the digital TV band (47〇~8〇6 MHz), the money impedance matching is at least 3:丨Vswr ((4) Return Loss 2 In practical applications, this impedance matching level can meet the requirements of digital TV signal reception. Figures 4 and 5 are the radiation field of the antenna of the present invention, respectively, of the frequency of 52GMWmhz. Figure. From the obtained 7jc plane (x_y plane) radiation field type, both are roughly - omnidirectional fee-a (four) field type 'meeting the application of general digital television channel needs 125965, and FIG. 6 is an antenna 1 of the present invention In the operating frequency band, the graph 'from the transmitted result' indicates the antenna gain on the vertical axis, and the horizontal axis indicates the antenna frequency in the digital TV band is about Z1 (four), which satisfies the gain requirement of the operation of the general digital television channel. Figure 7 is a matching circuit of the antenna of the present invention. The first other embodiment of the last name =: comprises: - a connecting metal piece 731, the end of which is associated with the radiating metal ^
731 j接，一電容凡件134，其一端與該連接金屬片 31電氣連接，另一端為該天線的訊號饋入點131。_由 =適當之電容值，該第一其他實施例也能達成本發日;天 、，，1部阻抗之補償，使本發明天線在數位電視頻帶内，天 線阻抗匹配均能至少達到3:lVSWR(6dB返回損失），滿 足數位電視訊號接收之實際應用需求。 第7B圖本發明天線之匹配電路—第二其他實施例結 ，圖’包含：-電容元件134，其—端與該韓射金屬片12 :，連接；一連接金屬片732，其一端與該電容元件134 電氣連接，另—端為該天線的訊號饋人點131。藉㈣敫 f當，電容值，該第二其他實施例也能達成本發明天心 雜抗之補償’使本發明天線在數位電視㈣内，天線阻 抗匹配均能至少達到3:lvsWR(6dB返回損失），滿足數 位電視訊號接收之實際應用需求。 —第8圖為本發明天線之一其他實施例結才冓圖，除了在 短路金屬線旁邊延伸了純接地面面積外，其他結構與實 她，1相同。該其他實施例，除了能達成數位電視頻道的 頻見與增ϋ需求，也由於充分運用了短路金屬線旁邊的空 1259605 :來延伸㈣接地㈣積，使㈣祕 與元㈣設空間能達到更具彈性與更有效率的應用μ731 j is connected to a capacitor 134, one end of which is electrically connected to the connecting metal piece 31, and the other end is a signal feeding point 131 of the antenna. _ By = appropriate capacitance value, the first other embodiment can also achieve the date of the present; day,,, 1 part of the impedance compensation, so that the antenna of the present invention in the digital television band, the antenna impedance matching can reach at least 3: lVSWR (6dB return loss), which meets the practical application requirements of digital TV signal reception. 7B is a matching circuit of the antenna of the present invention - a second embodiment of the present invention, the diagram comprising: - a capacitive element 134 whose end is connected to the Korean metal piece 12:, a connecting metal piece 732, one end of which The capacitive element 134 is electrically connected, and the other end is the signal feed point 131 of the antenna. By (4) 敫f, the capacitance value, the second other embodiment can also achieve the compensation of the antenna of the present invention. The antenna of the present invention can be at least 3: lvsWR (6dB return loss) in the digital television (4). ), to meet the practical application needs of digital TV signal reception. - Figure 8 is a diagram showing another embodiment of the antenna of the present invention, except that the pure ground plane area is extended beside the short-circuited metal line, and the other structure is the same as that of the real one. In this other embodiment, in addition to meeting the frequency and increasing demand of the digital TV channel, the space (125) is extended by (4) the grounding (four) product by fully utilizing the empty 125965 next to the short-circuited metal wire, so that the space of (4) secret and yuan (4) can be more Flexible and more efficient application μ
=合士述的㈣’本發明天線具有結構簡單、外型輕 衣作今易、且製作成本低的優點，功能明確 發明天線甚：高度產業應用價值，足以符合發明之㈣本 在上述龙月中所敘述之實施例僅為說明本發明裝置之 原理及其^，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1Α圖為本發明之數位電視接收天線之一實施例丨結構 圖。 第1Β圖為本發明之數位電視接收天線之一實施例丨訊號 輸入端結構放大圖。 第2Α圖為本發明天線之一實施例1應用於攜帶式多媒體 播放裝置於使用狀態之立體外觀示意圖。 第2Β圖為本發明天線之一實施例1應用於攜帶式多媒體 播放裝置於非使用狀態之立體外觀示意圖。 第3圖為本發明天線一實施例1之返回損失實驗測量結果 圖。 第4圖為本發明天線一實施例1操作於520 MHz之輻射場 型圖。 第5圖為本發明天線一實施例1操作於700 MHz之輻射場 12 1259605 型圖。 第6圖為本發明天線一實施例1之天線增益圖。 第7A圖為本發明天線之匹配電路一第一其他實施例結構 圖。 第圖為本發明天線之匹配電路一第二其他實施例結構 圖。 第8A圖為本發明之數位電視接收天線一其他實施例結構 .圖。 第8B圖為本發明之數位電視接收天線一其他實施例訊號 輪入端結構放大圖。 【主要元件符號說明】 I 本發明之數位電視接收天線一實施例 II 糸統接地面 12 輻射金屬片 ^ 13 匹配電路 131饋入點 132匹配電路之第一連接金屬片 133匹配電路之第二連接金屬片 134 電容元件 14 短路金屬線 141，142短路點 15天線於非使用狀態時之收藏折彎基準線 2A 本發明之數位電視接收天線應用於攜帶式多媒 13 1259605 體裝置之立發外觀示意圖（使用狀態） 2B本=之數位電視接收天線應用於攜帶式多媒體 衣置之立體外觀示意圖（非使用狀態）’、 7本發明t數位電視接收天線之匹配㈣其他實施 例 € t 731，732匹配電路之連接金屬片= (4) 'The antenna of the present invention has the advantages of simple structure, easy-to-wear light and easy to manufacture, and low production cost. The function is clear to invent the antenna even: high industrial application value, enough to meet the invention (4) in the above-mentioned dragon month The embodiments described herein are merely illustrative of the principles of the apparatus of the invention and are not limiting of the invention. Therefore, those skilled in the art can modify and change the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing an embodiment of a digital television receiving antenna of the present invention. Fig. 1 is an enlarged view showing the structure of an input terminal of an embodiment of the digital television receiving antenna of the present invention. Figure 2 is a perspective view showing the stereoscopic appearance of the portable multimedia playback device in one of the antennas of the first embodiment of the present invention. FIG. 2 is a schematic perspective view showing the stereoscopic appearance of the portable multimedia playback device in a non-use state according to Embodiment 1 of the antenna of the present invention. Fig. 3 is a graph showing the results of the experimental measurement of the return loss of the antenna of the first embodiment of the present invention. Fig. 4 is a radiation pattern diagram of an embodiment 1 of the antenna of the present invention operating at 520 MHz. Fig. 5 is a view showing an embodiment of the antenna of the present invention operating on a radiation field of 700 MHz 12 1259605. Figure 6 is a diagram showing the antenna gain of the antenna of the first embodiment of the present invention. Fig. 7A is a structural view showing a first alternative embodiment of the matching circuit of the antenna of the present invention. The figure is a structural view of a second alternative embodiment of the matching circuit of the antenna of the present invention. Fig. 8A is a view showing the structure of another embodiment of the digital television receiving antenna of the present invention. Fig. 8B is an enlarged view showing the structure of the wheel-in terminal of the other embodiment of the digital television receiving antenna of the present invention. [Description of main component symbols] I. The digital television receiving antenna of the present invention is an embodiment II. The grounding surface 12 of the radiant metal piece 13 The matching circuit 131 feeds the second connection of the first connecting metal piece 133 matching circuit of the matching circuit 132 Metal piece 134 Capacitive element 14 Short-circuited metal wire 141, 142 Short-circuit point 15 Antenna of the present invention in the non-use state Bending reference line 2A The digital TV receiving antenna of the present invention is applied to the vertical appearance of the portable multimedia 13 1259605 body device (Usage state) 2B this = digital TV receiving antenna is applied to the stereoscopic appearance of the portable multimedia clothing (non-use state) ', 7 matching of the t digital television receiving antenna of the present invention (4) Other embodiments € t 731,732 matching Connection metal piece of circuit
8本發明之數位電視接收天線一其他實施例 d輕射金屬片與系統接地面之間距8 digital television receiving antenna of the present invention - another embodiment d distance between the light-emitting metal piece and the system ground plane
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