1220581 五、發明說明（ο 【發明所屬之技術領域】 本發明係有關於一種雙頻倒F形天線，特別是應用在 無線通说手機上的内藏式天線 （internal antenna)。 【先前技術】 隨著通訊產業的蓬勃發展，在要求無線通訊多樣化的 同時’改變相關電路與系統設計及產品外觀縮小化，已曰 不容忽視的趨勢；摒除天線的角色，電路與系統可以以〜 系統晶片（s y s t e in ο n c h i p )的整合技術來解決通訊多樣化 與縮小化的問題，但在實際應用上，天線卻是無線通訊傳 送的主要功臣之一 ’然而在現有的通訊產品中，天線摄故 的空間都相當狹小，尤其是須要置放於產品機殼内部的内 藏式天線，因此天線的尺寸與性能便成為影響產品好壞的 重要關鍵之一。 ' 目前習用於内藏式手機天線的倒F形天線（inverted-F antenna)，其輻射金屬片均水平放置於接地面上方，且利 用相同長度之金屬饋針及短路金屬棒垂直連接輻射金屬片 與接地面，相關專利如美國專利第6，4 7 6，7 6 9號[專利名 稱：内藏式多頻帶天線（Internal multi-band1220581 V. Description of the invention (ο [Technical field to which the invention belongs] The present invention relates to a dual-frequency inverted F-shaped antenna, especially an internal antenna applied to a wireless talk phone. [Previous Technology] With the vigorous development of the communication industry, while diversifying wireless communications, 'changing the related circuit and system design and reducing the appearance of products has become a trend that must not be ignored; eliminating the role of antennas, circuits and systems can syste in ο nchip) integrated technology to solve the problem of communication diversification and downsizing, but in practical applications, the antenna is one of the main contributors to wireless communication transmission. However, in existing communication products, the space for antenna failure They are all quite small, especially the built-in antenna that needs to be placed inside the product case, so the size and performance of the antenna has become one of the important keys that affect the quality of the product. Antenna (inverted-F antenna), the radiating metal sheet is placed horizontally above the ground plane and uses the same length The metal feed pin and short-circuited metal rod connect the radiating metal sheet and the ground plane vertically. Related patents are US Patent No. 6, 4 7 6, 7 6 9 [Patent Name: Internal multi-band antenna (Internal multi-band antenna
1220581 五、發明說明（2) ~ --- antenna)]，此類天線之金屬饋針及短路金屬棒 同的長度，且其與輻射金屬片之接觸點，需利+ :曰具有相 來連接，故其製作過程較為繁雜。為改善:述缺^接技術 發明中提出一種雙頻倒F形天線之創新設計，將輕點’在本 線及短路金屬線以印刷或蝕刻技術形成於—：田射金屬 板（flexible printed circuit board)上，並 p t 刷電路 似矩形柱狀結構之保麗龍（f 〇am )或塑膠支擇物髀著於近 與輻射金屬線相連接之短路金屬線，並不需利用上，其中 來連接，使製作過程得以簡化，再加上軟性二銲接技術 於彎曲之特性，可降低天線整體尺寸且祌電路板易 度。 a叶的自由 【内容】 如上所述，本發明之目的在於提供一種雙頻 線的創新設計。本發明天線包含：一接地面，古’天 ”，、占及一接地點；一折彎之軟性印刷電路板，具有〜# 一 面及一第二平面，該第一及第二平面之間具有—^ ^ 接近9 0度之夾角，且該第一平面大致垂直於該又5 該筮-丞石也面’而 邊弟一千面大致平行於該接地面；一輻射金屬線 刷或姓刻技術形成於該軟性印刷電路板之第一及第1、、，p 上，用來產生一第一（低頻）共振模態及一第二 = 杈怨，該輻射金屬線具有一起始端及一末端，該起妒2 21220581 V. Description of the invention (2) ~ --- antenna)], the metal feed pin and short-circuit metal rod of this type of antenna have the same length, and the contact point with the radiating metal sheet needs to be profitable +: said to have a phase to connect , So its production process is more complicated. In order to improve: the invention of a dual-frequency inverted F-shaped antenna is proposed in the invention of the connection technology, and the light spot is formed on the local line and the short-circuited metal line by printing or etching technology:-flexible printed circuit board ), And the pt brush circuit resembles a rectangular columnar structure (f 0am) or a plastic support sticking to the short-circuited metal wire connected to the radiating metal wire, which does not need to be used, which is used to connect , Simplifying the manufacturing process, coupled with the flexibility of the flexible two-soldering technology, can reduce the overall size of the antenna and the ease of circuit board. The freedom of a leaf [Content] As mentioned above, the object of the present invention is to provide an innovative design of a dual frequency line. The antenna of the present invention includes: a ground plane, an ancient sky, and a ground point; a bent flexible printed circuit board having ~ # a side and a second plane, and the first and second planes have — ^ ^ Is close to an angle of 90 degrees, and the first plane is substantially perpendicular to the 55 筮-丞 石 也 面 'and the side of the thousandth plane is substantially parallel to the ground plane; a radiating metal wire brush or engraved name The technology is formed on the first and the first, first, and p of the flexible printed circuit board to generate a first (low-frequency) resonance mode and a second = branch complaint. The radiating metal wire has a start end and an end , The jealousy 2 2
第8頁 1220581 五、發明說明（3) 該輻射金屬線之饋入點，且該起始端至該末端間具有至少 三個9 0度或接近9 0度之折彎；一短路金屬線，係由印刷或 蝕刻技術形成於該軟性印刷電路板之第一平面上，用以連 接該輻射金屬線至該接地面之接地點；以及一饋入同軸 線，具有一中心導線及一外層導體，該中心導線連接至該 輻射金屬線之起始端，而其外層導體則連接至該接地面之 接地點。在本項設計中，我們應用軟性印刷電路板之特 性，將輻射金屬線與短路金屬線印刷或蝕刻於上，再將該 軟性印刷電路板折彎，並附著於一近似矩形柱狀結構之保 麗龍或塑膠支撐物體上，再經由調整該輻射金屬線的起始 端至末端的長度[約為第一（低頻）共振頻率的1 /4波長]， 可以得到適當的第一（低頻）共振頻率，而適當調整該輻射 金屬線的折彎點，則可以調整該天線的策二（高頻）共振頻 率；調整該第一平面上短路金屬線之短路點與該輻射金屬 線饋入點之距離，則可獲得良好的阻抗匹配。由這些特 性，我們即可輕易的設計出滿足GSM ( 8 9 0- 9 6 0 MHz)及DCS ( 1 7 1 0 - 1 88 0 MHz)的雙頻操作。 【實施方式】 第 1圖是本發明之天線一實施例置於一接地面上之結 構圖1，包含：一接地面1 2，具有一短路點1 7及一接地點 1 8，可以為一單一金屬片或以印刷技術形成於一微波介質 基板上；一折彎之軟性印刷電路板1 3，具有一第一平面Page 8 1220581 V. Description of the invention (3) The feed point of the radiating metal wire, and there are at least three 90 degree or near 90 degree bends from the starting end to the end; Formed on the first plane of the flexible printed circuit board by printing or etching technology to connect the radiating metal wire to a ground point of the ground plane; and a feeding coaxial line having a center wire and an outer conductor, the The center wire is connected to the starting end of the radiating metal wire, and its outer conductor is connected to the ground point of the ground plane. In this design, we apply the characteristics of a flexible printed circuit board, print or etch the radiating metal wire and the short-circuited metal wire, and then bend the flexible printed circuit board and attach it to an approximately rectangular columnar structure. On the Lilong or plastic support object, the appropriate first (low frequency) resonance frequency can be obtained by adjusting the length from the beginning to the end of the radiating wire [approximately 1/4 wavelength of the first (low frequency) resonance frequency]. , And if the bending point of the radiating metal wire is appropriately adjusted, the second (high-frequency) resonance frequency of the antenna can be adjusted; the distance between the short-circuit point of the short-circuit metal wire on the first plane and the feeding point of the radiating metal wire can be adjusted , You can get good impedance matching. With these characteristics, we can easily design dual-frequency operation that meets GSM (890-960 MHz) and DCS (1170-1800 MHz). [Embodiment] Fig. 1 is a structure diagram of an antenna of an embodiment of the present invention placed on a ground plane, including: a ground plane 12 having a short-circuit point 17 and a ground point 18, which can be a A single metal sheet is formed on a microwave dielectric substrate by printing technology; a bent flexible printed circuit board 13 has a first plane
1220581 五、發明說明（4) 131及一第二平面132，該第一及第二平面之間具有一個 9 0度或接近 9 0度之夾角，且固定於一近似矩形柱狀結構 之保麗龍（foam)或塑膠支撐物體14上，使該第一平面13工 大致垂直於該接地面1 2，而該第二平面1 3 2大致平行於該 接地面1 2 ; —輪射金屬線11，係由印刷或钱刻技術形成 於該軟性印刷電路板1 3之第一平面1 3 1及第二平面1 3 2上， 用來產生一第一（低頻）共振模態及一第二（高頻）共振模 態’該輪射金屬線具有一起始端1 1 1及一末端1 1 2，該起始 端為輻射金屬線之饋入點，且該起始端至該末端間具有四 個9 0度或接近9 0度之折彎；一短路金屬線1 6為一倒l來， 用以連接該輻射金屬線丨1至該接地面之短路點丨7，^印 刷或蝕刻於該軟性印刷電路板丨3之第一平面工3 1上及一 饋入同軸線1 5，用以傳輸訊號，該同軸線丨5具有一中心 導線151及一外層接地導體15〇，該中心導線^ ' 輻射金屬線11之饋入點m，而該外層接地 則= 至該接地面12之接地點18。 體150則連接 面之=為ί;明天線一實施例之輻射金屬線展開為平 、口冓圖，包έ •一軟性印刷電路板2 3、一 21及一，路金屬線26。該輻射金屬線21具有〜:始广m 及一末端212，利用印刷或蝕刻技術形成於 ° * 板23之第一平面231及 ：:生印席“路 哕太踹？ 1 9祕1 , 业忒起始端2 11至 二ΐ氏頻t 。崎的彎折，用於產h天線之第 _ 、弟一（咼頻）操作模態，且該輻射金屬線之長度1220581 V. Description of the invention (4) 131 and a second plane 132. The first and second planes have an included angle of 90 degrees or close to 90 degrees, and are fixed to a Pauli with an approximately rectangular columnar structure. On a dragon or a plastic support object 14 so that the first plane 13 is substantially perpendicular to the ground plane 12 and the second plane 1 3 2 is substantially parallel to the ground plane 12; Is formed on the first plane 1 3 1 and the second plane 1 3 2 of the flexible printed circuit board 13 by printing or money engraving technology, and is used to generate a first (low-frequency) resonance mode and a second ( High Frequency) Resonant Mode 'The shot metal wire has a starting end 1 1 1 and an end 1 1 2, the starting end is the feeding point of the radiating metal wire, and there are four 9 0 between the starting end and the end. Bends at or near 90 degrees; a short-circuited metal wire 16 is an inverted l for connecting the radiating metal wire 丨 1 to the short-circuit point of the ground plane 丨 7, printed or etched on the flexible printed circuit The first plane 3 of the board 3 is fed with a coaxial line 15 for transmitting signals. The coaxial line 5 has a center. The lead 151 and an outer grounding conductor 15o, the center wire ^ 'feeds the point m of the radiating metal wire 11, and the outer grounding = to the grounding point 18 of the ground plane 12. The body 150 is connected to the surface = ί; the radiating metal wire of an embodiment of the antenna is flattened out, including a flexible printed circuit board 2 3, a 21, and a road metal wire 26. The radiating metal wire 21 has ~: starting width m and one end 212, and is formed on the first plane 231 of the plate * by using printing or etching techniques and :: 印 印 席 "路 哕 太 踹? 1 9 secret 1, industry忒 start end 2 11 to the second ΐ frequency t. Bend of Saki, used to produce the first and second (咼) operating modes of the h antenna, and the length of the radiating metal wire
第10頁 1220581 五、發明說明（5) ----- 接近該第一（低頻）操作模態共振頻率的【/4波長。 ，3圖是本發明之天線一實施例於第丨圖結構下之返回 損失實驗量測結果；在本實施例中，該輻射金屬線之長度 約為95mm，天線高度（亦即為軟性印刷電路板之第二平面） 離，地面約為8 mm，而該接地面為一單一金屬片，其長度 及寬度分別為80 mm及40mm，該尺寸約為一典型手機 (handset )接地面之大小；該連接輻射金屬線至該接地面 之接地J之距離約為1 9 · 5mm ;該支撐物體為一近似矩形柱 狀結構之保麗龍，且其體積約為40mmx 8mmx 7mm。由所得 實驗結果，第一（低頻）操作模態31中心頻率位於約 925MHz第一（南頻）操作模態32中心頻率位於約 ^5ΜΗζ’在電壓駐波比（VSWR)小於2. 5的定義下，其操作 核恶足夠涵蓋 GSM( 8 9 0 - 9 6 0 MHz)及 DCS( 1 7 1 0- 1 880 MHz)兩 個頻段。 第4圖為本發明天線其他實施例結構圖；在實施例4 (a)圖中’該軟性印刷電路板4 3之折彎由二次連續折彎形 成，在4(b)圖中，該軟性印刷電路板43之折彎為一平滑之 曲面。 第5圖為本發明天線之輻射金屬線其他實施例結構 圖； 在管 # 、W例5 (a)圖中，輻射金屬線5 1由其起始端5 1 1至 •由三個約為9 0度之彎折路徑連接；在5 ( b )圖Page 10 1220581 V. Description of the invention (5) ----- [/ 4 wavelength close to the resonance frequency of the first (low frequency) operation mode. Figure 3 is the experimental measurement result of the return loss of an antenna of the present invention under the structure of Figure 丨; in this embodiment, the length of the radiating metal wire is about 95mm, and the antenna height (that is, a flexible printed circuit) The second plane of the board), the ground is about 8 mm, and the ground plane is a single metal piece with a length and width of 80 mm and 40 mm, respectively, which is about the size of a typical handset ground plane; The distance from the ground wire J connecting the radiating metal wire to the ground plane is about 19 · 5mm; the supporting object is a Polygon with an approximately rectangular columnar structure, and its volume is about 40mmx 8mmx 7mm. From the obtained experimental results, the first (low-frequency) operating mode 31 has a center frequency of about 925 MHz and the first (south frequency) operating mode 32 has a center frequency of about ^ 5ΜΗζ 'at a voltage standing wave ratio (VSWR) of less than 2.5. At the same time, its operational cores are sufficient to cover the two bands of GSM (890-960 MHz) and DCS (1770-10-1880 MHz). FIG. 4 is a structural diagram of another embodiment of the antenna of the present invention; in Embodiment 4 (a), the bend of the flexible printed circuit board 43 is formed by two continuous bendings. In FIG. 4 (b), the The bend of the flexible printed circuit board 43 is a smooth curved surface. Fig. 5 is a structural diagram of another embodiment of the radiating metal wire of the antenna of the present invention; in the tube #, W Example 5 (a), the radiating metal wire 51 is from its starting end 5 1 1 to 0 degree bend path connection; at 5 (b)
第11頁 1220581 五、發明說明（6) 中，輻射金屬線5 1之末端5 1 2被包圍在該輻射金屬線之内 部；而在5 ( c )圖中，輻射金屬線5 1大致為一蜿蜒金屬線的 結構。 以上說明中所述之實施例僅為說明本發明之原理及其 功效，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。Page 11 1220581 V. In the description of the invention (6), the end 5 1 2 of the radiating metal wire 5 1 is enclosed inside the radiating metal wire; and in the figure 5 (c), the radiating metal wire 5 1 is approximately one The structure of a meandering metal wire. The embodiments described in the above description are only for explaining the principle of the present invention and its effects, but not for limiting the present invention. Therefore, those skilled in the art can modify and change the above embodiments without departing from the spirit of the present invention. The scope of rights of the present invention should be listed in the scope of patent application mentioned later.
第12頁 1220581 圖式簡單說明 第1圖為本發明天線一實施例置於一接地面上之結構圖。 第2圖為本發明天線一實施例之輻射金屬線展開為平面之 結構圖。 第3圖為本發明天線一實施例之返回損失實驗量測結果。 第4圖為本發明天線之其他實施例結構圖。 第5圖為本發明天線之輻射金屬線其他實施例結構圖。 【元件符號說明】 1 :本發明之雙頻倒F形天線一實施例 1 1 ·輪射金屬線 111 ··輻射金屬線之起始端 1 1 2 :輻射金屬線之末端 1 2 :接地面 1 3 :軟性印刷電路板 1 3 1 :軟性印刷電路板之第一平面 1 3 2 :軟性印刷電路板之第二平面 14:保麗龍（foam)或塑膠支撐物體 1 5 :饋入同軸線 1 5 0 :饋入同軸線之外層接地導體 1 5 1 :饋入同軸線之中心導線 1 6 ·•短路金屬線 1 7 :短路點Page 12 1220581 Brief Description of Drawings Figure 1 is a structural diagram of an embodiment of an antenna of the present invention placed on a ground plane. FIG. 2 is a structural diagram of a radiation metal wire of an embodiment of the antenna of the present invention, which is developed into a plane. FIG. 3 is an experimental measurement result of return loss of an embodiment of the antenna of the present invention. FIG. 4 is a structural diagram of another embodiment of the antenna of the present invention. FIG. 5 is a structural diagram of another embodiment of a radiating metal wire of an antenna of the present invention. [Description of component symbols] 1: An embodiment 1 of the dual-frequency inverted F-shaped antenna of the present invention 1 · Rotary metal wire 111 · · Starting end of radiating metal wire 1 1 2: End of radiating metal wire 1 2: Ground plane 1 3: Flexible printed circuit board 1 3 1: First plane of flexible printed circuit board 1 3 2: Second plane of flexible printed circuit board 14: Foam or plastic supporting object 1 5: Feeding coaxial cable 1 5 0: Feed the ground conductor outside the coaxial line 1 5 1: Feed the center conductor of the coaxial line 1 6 • Short-circuited metal wire 1 7: Short-circuit point
第13頁 1220581 圖式簡單說明 1 8 :接地點 2 1 ·輪射金屬線 2 1 1 :輻射金屬線之起始端 2 1 2 :輻射金屬線之末端 2 3 :軟性印刷電路板 2 3 1 :軟性印刷電路板之第一平面 2 3 2 :軟性印刷電路板之第二平面 2 5 :折彎線 2 6 :短路金屬線 3 1 :第一（低頻）共振模態 3 2 ·弟二（而頻）共振模悲 41 輻 射 金 屬 線 42 接 地 面 43 軟 性 印 刷 電路板 44 保 麗 龍 (foam)或塑膠支撐物體 45 饋 入 同 轴 線 4 5 0 :饋入同軸線之外層接地導線 4 5 1 :饋入同軸線之中心導線 4 6 :短路金屬線 4 7 :短路點Page 13 1220581 Brief description of the drawing 1 8: Grounding point 2 1 · Rotating metal wire 2 1 1: Starting end of radiating metal wire 2 1 2: Ending of radiating metal wire 2 3: Flexible printed circuit board 2 3 1: The first plane of the flexible printed circuit board 2 3 2: the second plane of the flexible printed circuit board 2 5: the bend line 2 6: the short-circuited metal wire 3 1: the first (low-frequency) resonance mode 3 2 Frequency) resonance mode 41 radiation metal wire 42 ground plane 43 flexible printed circuit board 44 foam or plastic supporting object 45 feeding coaxial wire 4 5 0: feeding ground wire outside the coaxial wire 4 5 1: Central wire fed into coaxial line 4 6: Short-circuited metal wire 4 7: Short-circuited point
第14頁 1220581 圖式簡單說明 5 1 :輻射金屬線 5 1 1 :輻射金屬線之起始端 5 1 2 ·輪射金屬線之末端 5 3 :軟性印刷電路板 5 3 1 :軟性印刷電路板之第一平面 5 3 2 :軟性印刷電路板之第二平面 55 :折彎線 56 :短路金屬線Page 141220581 Brief description of the diagram 5 1: Radiation metal wire 5 1 1: Radial metal wire start 5 1 2 · Rotary metal wire end 5 3: Flexible printed circuit board 5 3 1: Flexible printed circuit board The first plane 5 3 2: the second plane of the flexible printed circuit board 55: the bend line 56: the short-circuit metal line
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