201004030 九、發明說明： 【發明所屬之技術領域】 ’特別是有關於一種可動 本發明是有關於一種天線系統 態改變輻射場型之天線系統。 【先前技術】 =著通訊㈣的精進，軌技術在科技產品的應用上亦 ，得相關的通訊產品日趨多樣化’而且近年來消 w ^ 的功能要求越來越高，所以許多具有不同設 2功此的通訊產品不斷被提出，就通訊產品而言，例如， 人數位助理(PDA)等，無線通訊裝置的使用率增加， 為了仔到較佳的通訊品質，天線的輻射場型越來越受重視。 =人數位助理(PDA)為例，習知之雙天線模組係設置於— -上，雙天職組係包含第—天線、第二天線及一切換單 換單元係受—控制指令以選擇第—天線或第二天線兩 者，、中之一，以接收較良好之訊號，藉此，即可因應pDA之 不同擺設方式’以產生良好接收效能。然而，為了配合PM 直立或橫向放置的需求而需設計她天線，造成pDA與天線 之結構設計上的_與複雜度外，且增加其輯之成本。 【發明内容】 本發明之目的就是在 以降低天線結構之設 有鑑於上述習知技藝之各項問題， 提供一種可調整輻射場型之天線系統， 計成本問題。 根據本發明之目的，提出一種可調整輻射場型之天線系 201004030 統’此天線系統包含一第一開關、一第二開關、一控制單元、 一輻射金屬片、一第一饋入點、一第二饋入點及一接地點。 第一饋入點係設置於輻射金屬片之邊緣，且第一饋入點係透 過第一開關連接一訊號源，第二饋入點係設置於輻射金屬片 之邊緣，且第二饋入點係透過第二開關連接訊號源，接地點 係設置於輻射金屬片之邊緣。其中’控制單元係控制第一開 關與第二開關之啟閉以決定輻射金屬片由第一饋入點或第二 . 饋入點收發訊號。藉此，可切換第一開關或第二開關以改變 不同之輻射場型，以運用於不同訊號接收或傳送的範圍。 【實施方式】 請參閱第1圖，其係為本發明之可調整輻射場型之天線 系統之實施例之示意圖。圖中，係以平面倒F型天線(Planar Inverted F Antenna，FIFA)作為實施範例，天線系統1包含一 第一開關11、一第二開關12、一控制單元13、一輻射金屬 片14、一第一饋入點15、一第二饋入點16、及一接地點π。 控制單元13係設置在一電路板上。 第一饋入點15係設置於輻射金屬片14之邊緣，例如， 在輻射第一端邊緣141，第一饋入點15係透過第一開關11 連接一訊號源18。第二饋入點16係設置於輻射金屬片14之 邊緣，例如，第二饋入點16係設置於輻射金屬片14之輻射 第二端邊緣142，第二饋入點16係透過第二開關12連接電 路板上之訊號源18。接地點17係設置於輻射金屬片14之邊 緣，例如，在輻射第三端邊緣143，並連接電路板的接地面。 控制單元13係控制第一開關11與第二開關12之啟閉以決定 6 201004030 輻射金屬片14由第一饋入點15或第二饋入點16收發訊號， 進而改變由饋入點出發及接地點出發之電流路徑，以改變不 同之輻射場型，可運用於不同訊號接收或傳送的範圍及方向。 其中，控制單元13係用以控制第一開關11以產生一第 一輻射場型’控制單元13係用以控制第二開關12以產生一 第二輕射場型。天線系統1較佳的是一平面倒F型天線(Planar Inverted F Antenna，FIFA)。第一開關 11 較佳的是一 PIN 二 極體 （ρ-intrinsic-n Diode) 或一雙極雙投 (double—pole—double—throw，DPDT)開關。第二開關 12 較佳 的是一 PIN二極體（p-intrinsic-n Diode)或一雙極雙投 (double—pole—double—throw，DPDT)開關。 此外，控制單元13可接收一外部操作訊號，並依據此外 部操作訊號來控制第一開關11及第二開關12。例如，外部 操作訊號可為使用者操作一使用者介面而產生，藉此使用者 可手動改變天線系統1之輻射場型。 此外，天線系統1更可包含一感應單元用以偵測應用此 天線系統1之無線裝置之使用狀態，控制單元13係依據偵測 結果以控制第一開關11及第二開關12，而感應單元係電性 連接控制單元13。感應單元可為重力偵測器，例如G_sens〇r， 可偵測無線裝置的擺放狀態，因此控制單元13可於無線裝置 直立時開啟第一開關n及關閉第二開關12，而於^線^置 平放時關閉第一開關11及開啟第二開關12。 接續’請參閱第2Α圖及第2Β圖，其係為本發明之可調 整輜射場型之天線系統之實施例之示意圖。此天線系統】係 設於一包含全球定位系統(Gps)模組（圖中未顯示）之個人數 7 201004030 位助理(PDA)中，當個人數位助理（圖中未顯示)被直立放置使 用時’天線系統1可透過一感應單元21用以自動感應個人數 位助理之使用狀態並產生一感應訊號211，控制單元13係依 據感應訊號211以控制切換第一開關丨〗為開啟狀態（〇N)，而 控制第二開關112為關閉狀態(0FF)，第—饋入點15係透過 第一開關11連接訊號源18，其中，感應單元21係電性連接 控制單元13。當訊號源18透過第一饋入點15傳送至輻射第 一端邊緣141時，係產生一第一輻射場型，由於天線的第一 輻射場型方向會受到系統接地點17的影響，故第一輻射場型 的最大能量是透過輻射第三端邊緣丨4 3所連接接地點丨7的方 向偏移。藉此，輻射第一端邊緣141係為第一饋入點15接收 或傳送訊號之頻段。 在第2B圖中，當個人數位助理被橫向放置使用時，天 線系統1可透過一感應單元21用以感應個人數位助理之使用 狀fe並產生一感應訊號211 ’控制單元13係依據感應訊號211 以控制切換第二開關12為開啟狀態（on)，而控制第一開關 11為關閉狀態(OFF)。第二饋入點16係透過第二開關12連 接訊號源18，其中，感應單元21係電性連接控制單元13。 當訊號源18透過第二饋入點16傳送至輻射第二端邊緣 142’以產生一第二輻射場型，由於天線的第二輻射場型方向 會欠到系統接地點17的影響，故第二輻射場型的最大能量是 透過輻射第三端邊緣143所連接接地點17的方向偏移。藉 此，輻射第二端邊緣142係為第二饋入點16接收或傳送訊號 之頻段。 ' 透過改變輻射場型，使個人數位助理可更有效地接收來 8 201004030 自爾星的無線訊號。 。任何未脫離本 或變更’均應包 以上所述僅為舉例性，而非為限制性者 發明之精神與範疇，而對其進行之等效修改 含於後附之申請專利範圍中。 ^ 【圖式簡單說明】 第！圖係、為本發明之可調整輕射場型之天線系統之示音 圖；以及 〜 第2A圖及第2B圖係為本發明之可調純射場型之天線 系統之實施例之示意圖。 【主要元件符號說明】 1 ·天線系統； u:第一開關； 12 .第二開關； 13 :控制單元； 14 :輻射金屬片； 141 :輻射第一端邊緣 142 :輻射第二端邊緣 143 :輻射第三端邊緣 15 ： 第一饋入點； 16 ： 第二饋入點； 17 ： 接地點； 18 ： 訊號源； 21 ： 感應單元；以 211 :感應訊號。 9201004030 IX. INSTRUCTIONS: [Technical field to which the invention pertains] ‘Specially related to a movable body The present invention relates to an antenna system in which an antenna system state changes a radiation pattern. [Prior technology] = The advancement of communication (4), the technology of the rail technology in the application of technology products, the related communication products are increasingly diversified' and the functional requirements of the elimination in recent years are getting higher and higher, so many have different settings 2 The communication products of this kind are constantly being proposed. In terms of communication products, for example, the number of PDAs, the usage rate of wireless communication devices increases, and in order to achieve better communication quality, the radiation field of the antenna is more and more. valued. = PDA, for example, the conventional dual antenna module is set on -, the double-day group includes the first antenna, the second antenna and a switch single unit are controlled by the control command to select the first - one of the antenna or the second antenna, to receive a better signal, whereby the pDA can be configured differently to produce good reception performance. However, in order to meet the needs of PM upright or lateral placement, her antenna needs to be designed, resulting in the _ and complexity of the structural design of the pDA and the antenna, and increasing the cost of the series. SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna system capable of adjusting a radiation field type in order to reduce the antenna structure in view of the above problems of the prior art. According to the purpose of the present invention, an antenna system with adjustable radiation pattern is proposed. The antenna system includes a first switch, a second switch, a control unit, a radiating metal piece, a first feeding point, and a first antenna. The second feed point and a ground point. The first feeding point is disposed at an edge of the radiating metal piece, and the first feeding point is connected to the signal source through the first switch, the second feeding point is disposed at the edge of the radiating metal piece, and the second feeding point is The signal source is connected through the second switch, and the grounding point is disposed at the edge of the radiating metal piece. The control unit controls the opening and closing of the first switch and the second switch to determine whether the radiating metal piece transmits and receives signals from the first feeding point or the second feeding point. Thereby, the first switch or the second switch can be switched to change different radiation patterns for use in the range of different signal reception or transmission. [Embodiment] Please refer to Fig. 1, which is a schematic diagram of an embodiment of an antenna system of an adjustable radiation field type according to the present invention. In the figure, a Planar Inverted F Antenna (FIFA) is used as an example. The antenna system 1 includes a first switch 11, a second switch 12, a control unit 13, a radiating metal sheet 14, and a The first feed point 15, a second feed point 16, and a ground point π. The control unit 13 is disposed on a circuit board. The first feed point 15 is disposed at the edge of the radiating metal sheet 14, for example, at the first end edge 141 of the radiation, the first feed point 15 is connected to a signal source 18 through the first switch 11. The second feed point 16 is disposed at the edge of the radiating metal sheet 14, for example, the second feed point 16 is disposed on the radiating second end edge 142 of the radiating metal sheet 14, and the second feeding point 16 is transmitted through the second switch. 12 is connected to the signal source 18 on the circuit board. The grounding point 17 is disposed on the edge of the radiating metal sheet 14, for example, at the third end edge 143 of the radiating surface, and is connected to the ground plane of the circuit board. The control unit 13 controls the opening and closing of the first switch 11 and the second switch 12 to determine that the 6 201004030 radiating metal sheet 14 transmits and receives signals from the first feed point 15 or the second feed point 16 to change the feed point and The current path from the ground point to change the different radiation patterns can be applied to the range and direction of different signal reception or transmission. The control unit 13 is configured to control the first switch 11 to generate a first radiation field type control unit 13 for controlling the second switch 12 to generate a second light field type. The antenna system 1 is preferably a Planar Inverted F Antenna (FIFA). The first switch 11 is preferably a PIN-intrinsic-n Diode or a double-pole-double-throw (DPDT) switch. The second switch 12 is preferably a PIN diode (p-intrinsic-n Diode) or a double-pole-double-throw (DPDT) switch. In addition, the control unit 13 can receive an external operation signal and control the first switch 11 and the second switch 12 according to the external operation signals. For example, the external operational signal can be generated by the user operating a user interface whereby the user can manually change the radiation pattern of the antenna system 1. In addition, the antenna system 1 further includes a sensing unit for detecting the usage state of the wireless device to which the antenna system 1 is applied, and the control unit 13 controls the first switch 11 and the second switch 12 according to the detection result, and the sensing unit The electrical connection control unit 13 is electrically connected. The sensing unit can be a gravity detector, such as G_sens〇r, which can detect the placement state of the wireless device, so the control unit 13 can turn on the first switch n and turn off the second switch 12 when the wireless device is upright, and When the flat panel is placed, the first switch 11 is turned off and the second switch 12 is turned on. Continuation' Please refer to FIG. 2 and FIG. 2, which are schematic diagrams of an embodiment of an adjustable dome type antenna system of the present invention. The antenna system is set in a personal number 7 201004030 PDA (including a GPS) module (not shown), when the personal digital assistant (not shown) is placed upright The antenna system 1 can be used to automatically sense the state of use of the personal digital assistant and generate an inductive signal 211. The control unit 13 controls the switching of the first switch according to the sensing signal 211 (〇N). The second switch 112 is controlled to be in a closed state (0FF). The first feed point 15 is connected to the signal source 18 through the first switch 11, wherein the sensing unit 21 is electrically connected to the control unit 13. When the signal source 18 is transmitted to the first end edge 141 of the radiation through the first feed point 15, a first radiation pattern is generated. Since the first radiation pattern of the antenna is affected by the system ground point 17, the first The maximum energy of a radiation field type is shifted by the direction of the ground point 丨7 to which the third end edge 丨4 3 is connected. Thereby, the first end edge 141 of the radiation is the frequency band at which the first feed point 15 receives or transmits the signal. In FIG. 2B, when the personal digital assistant is placed in a horizontal position, the antenna system 1 can be used to sense the usage of the personal digital assistant and generate an inductive signal 211 through the sensing unit 21. The control unit 13 is based on the sensing signal 211. The second switch 12 is controlled to be in an on state, and the first switch 11 is controlled to be in an off state (OFF). The second feed point 16 is connected to the signal source 18 through the second switch 12, wherein the sensing unit 21 is electrically connected to the control unit 13. When the signal source 18 is transmitted to the second end edge 142 ′ of the radiation through the second feed point 16 to generate a second radiation pattern, since the second radiation field direction of the antenna owes the influence of the system ground point 17 , The maximum energy of the two radiation field type is shifted by the direction in which the third end edge 143 of the radiation is connected to the ground point 17. Thus, the second end edge 142 of the radiation is the frequency band at which the second feed point 16 receives or transmits the signal. By changing the radiation field type, the personal digital assistant can receive the wireless signal of the 2010. . The invention is not to be construed as being limited to the scope of the invention, and the equivalents of the invention are included in the scope of the appended claims. ^ [Simple diagram description] No.! The figure is a sound diagram of an adjustable light field type antenna system of the present invention; and ~ 2A and 2B are schematic views of an embodiment of the adjustable pure field type antenna system of the present invention. [Main component symbol description] 1 · Antenna system; u: First switch; 12. Second switch; 13: Control unit; 14: Radiation metal piece; 141: Radiation first end edge 142: Radiation second end edge 143: Radiation third end edge 15: first feed point; 16: second feed point; 17: ground point; 18: signal source; 21: sensing unit; 211: sensing signal. 9