1238564 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種多頻印刷天線，尤指一種印刷電路 版後方具有金屬線段之多頻印刷天線。 5 ‘ 【先前技術】 由於數位式無線通信技術之長足發展，目前除了使用 類比調變之類比式廣播外，包括調頻調變（Frequency1238564 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a multi-frequency printed antenna, and more particularly to a multi-frequency printed antenna with a metal line segment behind a printed circuit board. 5 ‘[Previous Technology] Due to the rapid development of digital wireless communication technology, in addition to using analog broadcasting for analog broadcasting, including frequency modulation (Frequency
Modulation，FM)以及調幅調變（Amplitude Modulation 钃 10 ，AM )，更有新制定之數位式廣播（Digital AudioModulation (FM) and amplitude modulation (Amplitude Modulation 钃 10, AM), and newly developed digital audio (Digital Audio
Broadcasting，DAB或者是Digital Audio Radio，DAR)。 其中，數位式廣播由於抗雜訊能力較佳，能夠提供較佳之 廣播。口質，除此之外，較能充份利用頻寬以進行資料之傳 輸，預期未來必能全面取代類比式廣播。其中，數位式廣 15播之操作頻帶為210至240百萬赫玆（使用第三頻帶）。 如圖1所示，習知多頻印刷天線丨〇係包括置於印刷電路 版30正面且為連續彎折曲線之第一印刷導線12、第二印刷# 導線14、帛三印刷導線16、及第四印刷導線18，第一印刷 導線12之共振頻率為245MHz，第二印刷導線^之共振頻率 20為280MHz，帛三印刷導線16之共振頻率為245MHz，第四 印刷導線18之共振頻率為26〇MHz，#中，共振頻率係盘印 刷導線之真正長度呈反比。然而，習知多頻印刷天線_ 有下列缺失：習知多頻印刷天線1〇之共振頻率大多不落於 1238564 第二頻帶中，因此，接收數位式廣播訊號之增益較低，無 法取得數位式廣播良好之接收效果。 【發明内容】 5 本發明係揭露一種多頻印刷天線，係用以接收數位式 廣播訊號’並輸出至外部通信電路，其包括··至少一印刷 導線’係置於多頻印刷天線之上表面，並用以接收數位式 廣播訊號；以及至少一頻率調整線，係置於多頻印刷天線 之下表面’並分別置於至少一印刷導線之下方。 10 其中，至少一印刷導線及至少一頻率調整線之圖樣可 為圓形、矩形、曲線、直線、或連續曲線。 【實施方式】 為解決習知多頻印刷天線1〇之缺失，本發明多頻印刷 15天線20除了上表面具有第一印刷導線12、第二印刷導線 14、第三印刷導線16、及第四印刷導線18之外，其下表面 更具有第一頻率調整線22、第二頻率調整線24、及第三頻 率調整線26，並說明如下： 頻率調整線較佳係對應至印刷導線之中心線段位 20置，如圖2所示，第二頻率調整線24係置於第二印刷導線14 之月面，且對應至第一印刷導線14之中心線段位置；第二 頻率調整線26係置於第四印刷導線18之背面，且對應至第 四印刷導線18之中心線段位置，由於第二印刷導線丨4、第 三印刷導線16、及第四印刷導線18之共振頻率係以耦合之 1238564 方式，將共振頻率耦合至第一印刷導線12，再由第一印刷 導線12將接收之數位式廣播輸出至外部通信電路（未顯 示）因此，其他印刷導線與第一印刷導線12之距離將決 定共振頻率之搞合能力。由於第三印刷導線16距離第一頻 5率調整線22之物理距離最遠，為了增加第一頻率調整線^ 振頻率之耗合此力，將第一頻率調整線Μ同時置於第 一印刷導線12及第三印刷導線16之背面，且對應至第一印 刷導線12與第二印刷導線丨6之中心線段位置。其中，第一 印刷導線12、第二印刷導線14、第三印刷導線16、第四印 10刷導線18、第一頻率調整線22、第二頻率調整線24、及第 三頻率調整線26所形成之圖樣（pattern)並無限定，可為 圓形、矩形、曲線、或直線等，較佳係為連續曲線，且第 一頻率調整線22、第二頻率調整線24、及第三頻率調整線 26之長度較佳係分別為第三印刷導線16、第二印刷導線 15 14、及第四印刷導線18之長度之一半。 如圖3所示，曲線32係為未具有第三頻率調整線^之 第四印刷導線18,於接收數位式廣播訊號時，第四印刷導 線18因共振所產生之電流強度；曲線34係放置第三頻率調 整線26於第四印刷導線18之背後，於接收數位式廣播㈣ 20時，第四印刷導線共振所產生之電流強度。由此圖; 可得知，增加第三頻率調整線26後，第四印刷導線“因共 振所流經之電流強度增加’如此一來，可改善第四印刷導 線18所接收數位式廣播訊號之能力及抗雜訊能力。 1238564 另外’由折返損失之增益圖即可比較習知多頻印刷天 線10與本發明多‘印刷天線20於訊號接收能力之差異，折 返損失之增益值愈低，表示多頻印刷天線愈容易接收到數 位式廣播訊號。如圖4所示，由折返損失之增益圖之橫軸為 5頻率，縱軸為訊號之折返損失，曲線42係為習知多頻印刷 天線10所感應之共振頻率，其中，第一印刷導線12、第二 印刷導線14、第三印刷導線16、及第四印刷導線18所接收 訊號之頻率值係分別為215MHZ、228MHZ、260MHZ、及 273MHz ’大多不落於第三頻帶之内；曲線44係為本發明多 10頻印刷天線20所感應之共振頻率，此時，第一印刷導線12、 第二印刷導線14、第三印刷導線16、及第四印刷導線18所 接收訊號之頻率值係分別為21〇MHz、219MHz、230MHz、 及240MHz ’由此可知，第一印刷導線丨2之背面增加頻率調 整線22,可使第一印刷導線12之共振頻率由215MHz偏移至 15 210MHz，並使第二印刷導線μ之共振頻率由偏移 至230MHz ’依此類推。由上述比較中可知，本發明多頻印 刷天線20不但所感應之共振頻率較集中至第三頻帶，且其 折返損耗亦小於習知多頻印刷天線1 〇之折返損耗，如此一 來，本發明多頻印刷天線20對於數位式廣播訊號之接收能 20力較習知多頻印刷天線10為佳。 由於習知多頻印刷天線1〇之共振頻率較高，故其體積 較小’並於習知多頻印刷天線1 〇安置複數頻率調整線，以 形成本發明多頻印刷天線20 ’不但可接收數位式廣播訊 1238564 號’亦改善折返損失，故較習知多頻印刷天線丨0具有顯著 之進步性及產業利用性。 上述貫施例僅係為了方便說明而舉例而已，本發明所 主張之權利範圍自應以申請專利範圍所述為準，而非僅限 5 於上述實施例。Broadcasting, DAB or Digital Audio Radio, DAR). Among them, digital broadcasting can provide better broadcasting due to better anti-noise ability. Mouth quality, in addition to being able to make full use of bandwidth for data transmission, is expected to fully replace analog broadcasting in the future. Among them, the operating frequency band of digital broadcast is 210 to 240 megahertz (using the third frequency band). As shown in FIG. 1, the conventional multi-frequency printed antenna includes a first printed wire 12, a second printed wire 14, a third printed wire 16, and a first printed wire placed on the front of the printed circuit board 30 and having a continuous bending curve. Four printed conductors 18, the first printed conductor 12 has a resonance frequency of 245 MHz, the second printed conductor 2 has a resonance frequency of 280 MHz, the third printed conductor 16 has a resonance frequency of 245 MHz, and the fourth printed conductor 18 has a resonance frequency of 26. In MHz, #, the resonance frequency is inversely proportional to the true length of the disc printed wire. However, the conventional multi-frequency printed antenna _ has the following shortcomings: most of the resonant frequencies of the conventional multi-frequency printed antenna 10 do not fall in the second band of 1238564. Therefore, the gain of receiving digital broadcast signals is low, and digital broadcast cannot be obtained well. Of receiving effect. [Summary of the Invention] 5 The present invention discloses a multi-frequency printed antenna, which is used to receive a digital broadcast signal 'and output to an external communication circuit, which includes ... At least one printed wire' is placed on the upper surface of the multi-frequency printed antenna. And is used to receive digital broadcast signals; and at least one frequency adjustment line is placed on the lower surface of the multi-frequency printed antenna and is placed under the at least one printed wire, respectively. 10 Among them, the pattern of at least one printed wire and at least one frequency adjustment line may be circular, rectangular, curved, straight, or continuous curve. [Embodiment] In order to solve the deficiency of the conventional multi-frequency printed antenna 10, the multi-frequency printed 15 antenna 20 of the present invention has a first printed wire 12, a second printed wire 14, a third printed wire 16, and a fourth printed wire in addition to the upper surface. In addition to the lead 18, the lower surface further has a first frequency adjustment line 22, a second frequency adjustment line 24, and a third frequency adjustment line 26, and is explained as follows: The frequency adjustment line preferably corresponds to the center line segment of the printed wire. As shown in FIG. 2, the second frequency adjustment line 24 is placed on the moon surface of the second printed wire 14 and corresponds to the position of the center line segment of the first printed wire 14; the second frequency adjustment line 26 is placed on the first The back side of the four printed conductors 18 corresponds to the position of the center line segment of the fourth printed conductor 18. Because the resonance frequencies of the second printed conductor 4, the third printed conductor 16, and the fourth printed conductor 18 are coupled in a 1238564 manner, The resonance frequency is coupled to the first printed wire 12, and the received digital broadcast is output by the first printed wire 12 to an external communication circuit (not shown). The distance will determine the ability of the resonance frequency to fit. Because the third printed wire 16 is the farthest from the first frequency 5 rate adjustment line 22, in order to increase the consumption of the first frequency adjustment line ^ vibration frequency, the first frequency adjustment line M is placed on the first printing at the same time. The back surfaces of the conductive wires 12 and the third printed conductive wires 16 correspond to the positions of the center line segments of the first printed conductive wires 12 and the second printed conductive wires 6. Among them, the first printed wire 12, the second printed wire 14, the third printed wire 16, the fourth printed wire 10, the first frequency adjustment line 22, the second frequency adjustment line 24, and the third frequency adjustment line 26 The pattern to be formed is not limited, and may be a circle, a rectangle, a curve, or a straight line, preferably a continuous curve, and the first frequency adjustment line 22, the second frequency adjustment line 24, and the third frequency adjustment The length of the wire 26 is preferably a half of the length of the third printed wire 16, the second printed wire 15 14, and the fourth printed wire 18 respectively. As shown in FIG. 3, curve 32 is the fourth printed wire 18 without the third frequency adjustment line. When receiving digital broadcast signals, the current intensity of the fourth printed wire 18 due to resonance; curve 34 is placed The third frequency adjustment wire 26 is behind the fourth printed wire 18, and when receiving the digital broadcast radio 20, the intensity of the current generated by the fourth printed wire resonance. From this figure, it can be seen that after the third frequency adjustment line 26 is added, the fourth printed wire "increases the intensity of the current flowing through the resonance". As a result, the digital broadcast signal received by the fourth printed wire 18 can be improved. 1238564 In addition, the difference between the conventional multi-frequency printed antenna 10 and the multi-printed antenna 20 of the present invention in the signal receiving capability can be compared from the gain map of the return loss. The lower the return loss gain value, the more The higher frequency printed antenna is, the easier it is to receive digital broadcast signals. As shown in Figure 4, the horizontal axis of the gain chart of the return loss is 5 frequencies, and the vertical axis is the signal return loss. Curve 42 is a conventional multi-frequency printed antenna 10 Induced resonance frequencies, among which the frequency values of the signals received by the first printed wire 12, the second printed wire 14, the third printed wire 16, and the fourth printed wire 18 are 215MHZ, 228MHZ, 260MHZ, and 273MHz, respectively. Does not fall within the third frequency band; curve 44 is the resonance frequency induced by the multi-band printed antenna 20 of the present invention. At this time, the first printed wire 12, the second printed wire 14, and the third The frequency values of the signals received by the brush conductor 16 and the fourth printed conductor 18 are 21 MHz, 219 MHz, 230 MHz, and 240 MHz, respectively. The resonance frequency of the first printed wire 12 is shifted from 215 MHz to 15 210 MHz, and the resonance frequency of the second printed wire μ is shifted from 230 MHz 'and so on. It can be seen from the above comparison that the multi-frequency printed antenna 20 of the present invention not only The induced resonance frequency is more concentrated in the third frequency band, and its foldback loss is less than the foldback loss of the conventional multi-frequency printed antenna 10. In this way, the multi-frequency printed antenna 20 of the present invention is capable of receiving digital broadcasting signals 20 It is better than the conventional multi-frequency printed antenna 10. Since the conventional multi-frequency printed antenna 10 has a higher resonance frequency, its volume is relatively small, and a plurality of frequency adjustment lines are arranged in the conventional multi-frequency printed antenna 10 to form the multi-frequency printed antenna of the present invention. Frequency printed antenna 20 'Not only can receive digital broadcast signal No. 1238564' but also improve the return loss, so it has significant progress and industrial applicability compared to the conventional multi-frequency printed antenna 丨 0 Penetration above embodiments only and for convenience of explanation and example only, the scope of the present invention as claimed in claimed from the scope of the patent should be subject, not only to the above-described embodiment 5.
I 【圖式簡單說明】 圖1係習知多頻印刷天線之示意圖。 圖2係本發明多頻印刷天線之示意圖。 10 圖3係電流密度分佈圖。 圖4係折返損失之增益圖。 【圖號說明】 10 習知多頻印刷天線 12 第一印刷導線 14 第二印刷導線 16 第三印刷導線 18 第四印刷導線 2〇 本發明多頻印刷天線 22 第一頻率調整線 24 第二頻率調整線 26 第三頻率調整線 32 曲線 曲線 34 1238564 42 曲線 44 曲線I [Schematic description] Figure 1 is a schematic diagram of a conventional multi-frequency printed antenna. FIG. 2 is a schematic diagram of a multi-frequency printed antenna of the present invention. 10 Figure 3 shows the current density distribution. Fig. 4 is a gain chart of foldback loss. [Illustration of drawing number] 10 Conventional multi-frequency printed antenna 12 First printed wire 14 Second printed wire 16 Third printed wire 18 Fourth printed wire 20 Multi-frequency printed antenna 22 of the present invention 22 First frequency adjustment line 24 Second frequency adjustment Line 26 Third frequency adjustment line 32 Curve curve 34 1238564 42 Curve 44 curve
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