1352456 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種雙頻天線，尤其是一種具有雙饋入 之雙頻天線，適用於無線通訊產品手機上。 【先前技術】 隨著無線通訊的快速發展，在無線通訊產品中’天線 的性能成為影響通訊產品接收與傳輸信號品質的關鍵之一 ^ 。台灣發明專利第1257,740號“供雙頻帶通信裝置用之雙頻 帶内部天線”，揭示一種適用於雙頻帶之倒F形天線設計 ’但該天線僅具有一單饋入，實際應用時一般必須先連接1352456 IX. Description of the Invention: [Technical Field] The present invention relates to a dual-band antenna, and more particularly to a dual-frequency antenna with dual feed, which is suitable for use in a wireless communication product mobile phone. [Prior Art] With the rapid development of wireless communication, the performance of the antenna in wireless communication products has become one of the key factors affecting the quality of receiving and transmitting signals of communication products. Taiwan Invention Patent No. 1257,740 "Double-band internal antenna for dual-band communication devices", discloses an inverted-F antenna design suitable for dual-bands. However, the antenna has only a single feed, which is generally necessary for practical applications. Connect first
S > 至一切換電路(diplexer) ’分離出兩個不同之饋入訊號（如 GSM及DCS)，再連接至後端模組。此一切換電路將會佔據 手機電路模組之一部分空間，也會消耗部分功率，造成整 體天線效率降低，同時還會增加匹配之複雜度。 | ίS > A switcher (diplexer) separates two different feed signals (such as GSM and DCS) and connects to the backend module. This switching circuit will occupy a part of the space of the mobile circuit module, and will also consume part of the power, which will reduce the efficiency of the whole antenna and increase the complexity of matching. | ί
I ；· 【發明内容】 為解決這些問題’我們提出一種具有雙饋入之雙頻天 線的創新設計，不僅可同時產生一低頻操作頻帶（GSM，89〇 960 MHz) ’ 一咼頻操作頻帶（DCS，171〇〜188〇MHz)，更因其雙 饋入之間具有高隔離度之特性，不須於天線饋入端外加一 切換電路，即可直接將饋入端連接至後端Gs_cs模組。 雙饋入βχ冲省去該切換電路在手機電路模組所需之空間 ，讓手機電路模組有更多其他應用空間，亦可減少功率消 1352456 源151 ;及一第二饋入金屬部152 ，其一端電氣連接至該 第二轄射金屬部131之第二饋入點132 ，另一端連接至該 第二饋入信號源151 。在本實施例1中，該接地面η係以 印刷或姓刻技術形成於一介質基板1〇上。此外該第一輪射 金屬部121及該第二輻射金屬部131 ，均係以一金屬片沖 壓或切割製作而成。 第2圖為第一圖本發明天線之實施例1的反射係數 鲁 ⑺11 、$22)及隔離度（s^)量測結果。在實施例1中選擇下 列尺寸進行量測：該接地面U尺寸為45 x 110 _2 ;該第一 轄射金屬部121距離該接地面U約為7mm，總長度約為 80mm(約為GSM頻帶中心頻率之1/4波長）；該第一短路金 屬部123其長度約為7mm、寬度約為2mm ;該第二輻射金 屬部131距離該接地面u約7mm，總長度約為4〇胃（約為 DCS頻帶中心頻率之1/4波長）；該第二短路金屬部133其 長度約為7mm、寬度約為2_ ;該第一饋入金屬部142其 •長度約為7mm、寬度約為2咖；該第二饋入金屬部152其 長度約為7mm、寬度約為2mm。由所得實驗結果在*册 反射係數的定義下，其第一共振模態或較低操作頻帶21足 以涵蓋GSM頻帶（890〜96〇MHz)，而在第二共振模態或較高操 作頻帶22足以涵蓋Dcs頻帶（171〇〜麵麻），而在隔離度二 方面，兩模態之隔離度皆小於_2〇册。 第3圖^第4圖為本發明天線一實施例分別於925 MHz 與1795 MHz之輕射媒并】jgj , 射％里圖。由所得之結果，與傳統單極天 1352456 一輻射金屬部631呈現圓滑曲線之形狀，亦可達 例1之同樣功效。此外該第一輻射金屬部621與 射金屬部631係以印刷或钱刻技術形成於一介質 〇 以上說明中所述之實施例僅為說明本發明之 力效’而非限制本發明。因此，習於此技術之人 逆牙本發明之精神對上述實施例進行修改及變化 % 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1圖為本發明天線之一實施例結構圖， 第2圖為本發明天線之一實施例之反射係數（S11 隔離度（s21)量測結果， 第3圖為本發明天線一實施例於925 MHz之輻射場 第4圖為本發明天線一實施例於1795 MHz之輻射 第5圖為本發明天線之第一其他實施例結構圖， 第6圖為本發明天線之第二其他實施例結構圖。 【主要元件符號說明】 10 :本發明天線一實施例 10’ 50, 60 :介質基板 11 :接地面 成與實施 該第二輻 基板60上 原理及其 士可再不 。本發明 、S22)及 型圖， 場型圖， 12 1352456In order to solve these problems, we propose an innovative design with a dual-input dual-frequency antenna that can simultaneously generate a low-frequency operating band (GSM, 89〇960 MHz). DCS, 171〇~188〇MHz), because of its high isolation between the double feeds, it is not necessary to add a switching circuit to the antenna feed end, and the feed end can be directly connected to the back end Gs_cs mode. group. The double feed β χ 省 omits the space required by the switching circuit in the mobile phone circuit module, so that the mobile phone circuit module has more application space, and can also reduce the power consumption 1352456 source 151; and a second feed metal portion 152 One end is electrically connected to the second feeding point 132 of the second urging metal portion 131, and the other end is connected to the second feeding signal source 151. In the first embodiment, the ground plane η is formed on a dielectric substrate 1 by a printing or surname technique. Further, the first round metal portion 121 and the second radiating metal portion 131 are formed by pressing or cutting a metal sheet. Fig. 2 is a measurement result of reflection coefficient Lu (7) 11, $22) and isolation (s^) of the first embodiment of the antenna of the present invention. In the first embodiment, the following dimensions are selected for measurement: the ground plane U has a size of 45 x 110 _2; the first urging metal portion 121 is about 7 mm from the ground plane U, and the total length is about 80 mm (about the GSM band). The first short-circuit metal portion 123 has a length of about 7 mm and a width of about 2 mm; the second radiating metal portion 131 is about 7 mm from the ground plane u, and the total length is about 4 〇 stomach ( About 1/4 wavelength of the center frequency of the DCS band; the second short metal portion 133 has a length of about 7 mm and a width of about 2 _; the first feed metal portion 142 has a length of about 7 mm and a width of about 2 The second feed metal portion 152 has a length of about 7 mm and a width of about 2 mm. From the experimental results obtained, under the definition of the reflection coefficient of the book, its first resonance mode or lower operating band 21 is sufficient to cover the GSM band (890 to 96 〇 MHz), and in the second resonance mode or the higher operating band 22 Sufficient to cover the Dcs band (171〇~ face), and in terms of isolation, the isolation of the two modes is less than 2〇. Fig. 3 is a diagram showing an embodiment of an antenna according to the present invention in a light medium of 925 MHz and 1795 MHz, respectively, and a graph of jgj and %. As a result, the same effect as in Example 1 can be obtained by the fact that the conventional unipolar day 1352456-radiation metal portion 631 has a rounded curve shape. Further, the first radiating metal portion 621 and the metal emitting portion 631 are formed in a medium by printing or engraving techniques. The above-described embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Therefore, those skilled in the art will be able to modify and change the above-described embodiments in the spirit of the present invention. The scope of the claims should be as set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural diagram of an embodiment of an antenna according to the present invention, and FIG. 2 is a reflection coefficient (S11 isolation (s21) measurement result of one embodiment of the antenna of the present invention, and FIG. Inventive antenna, an embodiment of the radiation field at 925 MHz, FIG. 4 is a radiation diagram of an embodiment of the antenna of the present invention at 1795 MHz. FIG. 5 is a structural diagram of a first other embodiment of the antenna of the present invention, and FIG. 6 is an antenna of the present invention. Second structural diagram of the other embodiments. [Main component symbol description] 10: The antenna of the present invention is an embodiment 10' 50, 60: the dielectric substrate 11: the ground plane is formed and the principle of the second spoke substrate 60 is implemented. The present invention, S22) and type diagram, field pattern, 12 1352456
110 :接地 面之一邊緣 111 :第一 短路點 112 :第二 短路點 12, 624 :第一 天線 121,621 :第一 輕射金屬部 122, 622 :第一 饋入點 123 :第一 短路金屬部 13,630 •第二 天線 131,631 *第二 輕射金屬部 132, 632 •第二 饋入點 133 ··第二 短路金屬部 14 :第一 饋入信號組件 141 :第— 饋入信號源 142 :第一 饋入金屬部 150 •第二 饋入信號組件 151 •第二 饋入信號源 152 •第二 饋入金屬部 21 •第一共振模態或較低操作頻 果） 22 :第二共振模態或較高操作頻 果） 23 .隔離度（¾量測結果） (反射係數Sn量測結 (反射係數S22量測結 13110: one edge of the ground plane 111: first short circuit point 112: second short circuit point 12, 624: first antenna 121, 621: first light metal portion 122, 622: first feed point 123: first short metal Portion 13,630 • Second antenna 131, 631 * Second light metal portion 132, 632 • Second feed point 133 · Second short metal portion 14: First feed signal component 141: First feed signal source 142: First feed metal portion 150 • second feed signal component 151 • second feed signal source 152 • second feed metal portion 21 • first resonant mode or lower operating frequency) 22: second resonant mode State or higher operating frequency) 23. Isolation (3⁄4 measurement result) (reflection coefficient Sn measurement knot (reflection coefficient S22 measurement knot 13