1330904 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種内藏式天線，特別是適合應用在無 線通訊產品上的内藏式多頻天線。 【先前技術】 隨著無線通訊的發展，無線網路的應用越來越廣泛， 因此天線的性能便成為影響產品價值的重要關鍵之一。相 關之先前技術包括台灣專利公告第563,274號，，雙頻天線" ，其揭示一種利用筆記型電腦液晶螢幕内建的接地面，在 該接地面上設計倒F形天線的例子，不過該天線雖適用於 U GHz、5GHz (包含5 2、5 8GHz)雙頻帶操作之無線 區域網路系統，但高頻頻寬僅勉強包含5·2、5·8 GHz之頻 帶，使得天線量產時’其製作上之可允許誤差低。為解決 此問題，我們提出一種内藏式多頻天線的創新設計，該 天線可以多頻操作於一無線區域網路（WLAN )，不僅可 產生一低頻操作頻帶涵蓋無線區域網路24 GIfe頻帶（24〜 2-484 GHz )，更可在高頻操作頻帶產生約1. 8 之操作頻 ^ ’輕易地涵蓋無線區域網路5 GHz頻帶〔包含5 2服頻 :(5.15 〜5.35 GHz )及 5.8 GHz頻帶（ 5.725〜5.825 GHz)’〕之 刼作需求，大幅提升量產時本發明天線製作上的可容許誤 差且本發明天線具有縮小化天線設計之優點，適合應用 於…、線通訊產品上’達成縮小化且多頻操作之通訊功能。 13-30904 【發明内容】 如上所述，本發明之目的在於提供一種内藏式多頻天 線的創新設計’而本發明天線之一實施例，可以多頻操作 於一無線區域網路，不僅可產生一低頻操作頻帶涵蓋無線 區域網路2. 4 GHz頻帶（2.4〜2.484 GHz )，更可在高頻操作 頻π產生約1. 8 GHz之操作頻寬，輕易地涵蓋無線區域網路 5 GHz 頻帶〔包含5.2 GHz頻帶（5.15 〜5.35GHz )及 5.8GHz 頻帶（ 5.725〜5.825 GHz)〕之操作需求，大幅提升量產時本 發明天線製作上的可容許誤差，且本發明天線具有縮小化 天線設計之優點，適合應用於無線通訊產品上，達成縮小 化且多頻操作之通訊功能。本發明天線包含··一接地面， 形狀大致為-矩形，具有一上方邊緣，且在該上方邊緣附 近具有-接地點及-短路點；一輻射金屬臂，其形狀大致 f一倒W ’位於該接地面之上方邊緣處，其具有一起始 ^與-末端’該起始端位於該接地面之上方邊緣處附近， ^亥^面之上方邊緣具有一第一特定距離，並且為天線 二而該末端則大致平行於該接地面之上方邊緣， 。亥輕射金屬臂用以產生魄古 -寄生短路今屬辟 &線-頻刼作頻帶之-共振模態； 面之上方形狀大致為一倒匕形，位於該接地 上方邊緣處，其具有一起始 路至該接地面之短 禾柒，忒起始鈿紐 之末端方抽'而該末端則往朝向該輻射金屬臂 您禾鸲方向延伸，與該輻射金屬臂之 距離，而該寄生短路金屬臂與該 ：有第-特疋 低頻操作頻帶之— 〃、μ *屬臂用以產生天線 之共振㈣以及另一較高頻率之一共振模 7 1330904 態；及一饋入傳輸線，用以傳輸訊號，包含：一中心導線 ，連接至該輻射金屬臂之起始端；及一外層接地導體，連 接至該接地面之接地點；同時該輻射金屬臂及該寄生短路 金屬臂由印刷或蝕刻技術形成於一介質基板上。 ^在本項設計中，我們可以藉由適當地調整該輻射金屬 臂之長度’產生天線高頻頻帶之一共振模態，而該輻射金 屬臂之長度接近該高頻頻帶之一共振模態中心頻率之〇.i5 〜0.25波長；以及藉由適當地調整該寄生短路金屬臂之長 度，產生天線低頻操作頻帶之一共振模態以及另一較高頻 率之-共減態，而該寄生短路金屬臂與該㈣金屬臂長 度之總和接近該低頻操作頻帶之—共振模態中心頻率之 =〜0·25波長；再適#地調整該輻射金屬臂與接地面之距 離（第1圖中之hl，一般大於，且調整該寄生短 路金屬臂與接地面之距離（ 坌、今生紐 雕1弟1圖中之h2，一般大於15 mm )’同時適當地調整該 牵田射金屬臂之饋入點與接地面 圖中之t，一般小於—， ⑲射金屬臂與寄生短路金屬臂之距離（帛1圖中之d， :般小於Μ ，可以得到良好之阻抗匹配，進而於得足 可涵蓋目前無線區域網路所需一 天：”U #作需求，且本發明天線具有縮小化 天線δ又计之優點，適合應用 化且多頻操作之通訊功能。心產°°上，達成縮小 1330904 【實施方式】 參考第1圖，本發明夕一^ 1包括· ；& π A U 種内臧式多頻天線一實施例 i匕枯.一接地面13，形妝女& & ^ Q ^ 狀大致為一矩形，具有一上方邊 :二該上方邊緣131附近具有-接地點132及- :占33 ; 一輕射金屬臂14，其形狀大致為-倒L形， 位於该接地面之上方邊緩 万遺緣131處，其具有一起始端⑷與 末^ M2，该起始端141位於該接地面之上方邊緣⑶ 處附近，與該接地面之上方邊緣m具有—第一特定距離 t ’並且為天線之饋入點彳41 ，士 山 碩八點141 ，而该末端142則大致平行 於該接地面之上方邊续ηι ，$ &入印 工々瓊緣131 ，該輻射金屬臂14用以產生天 線高頻操作頻帶之一共振模態22 ; 一寄生短路金屬臂Μ， 其形狀大致為-倒L形，位於該接地面之上方邊緣ΐ3ι處 ’其具有-起始端151與—末端152，該起始# 151短路 至該接地面之短路點133 ，而該末端152則往朝向該輻射 金屬臂之末端142方向延伸，與該輻射金屬臂之末端142 具有一第二特定距離d，而該寄生短路金屬臂15與該輻射 金屬臂1一4用以產生天線低頻操作頻帶之一共振模態21以及 另-較高頻率之一共振模態23 ;及一饋入傳輸線16，用以 傳輸訊號’包含··一中心導線161，連接至該輻射金屬臂 之起始端141 ’·及一外層接.地導體162 ，連接至該接地面 之接地點132。在本實施例丨中，該輻射金屬臂14產生之 一共振模態22與由該輻射金屬臂14及該寄生短路金屬臂15 所產生之另一較高頻率之共振模態23合成天線之高頻操作 頻帶；且該輻射金屬臂14及該寄生短路金屬臂15由印刷或 9 1330904 餘刻技術形成於-介質基板17上；由以上配置方式可 到良好之阻抗匹配，進而獲得足夠之操作頻寬，即可涵： 目前無線區域網路所需之24GHz頻帶及5碰頻帶ς =求’且本發明天線具有縮小化天線設計之優點，適用於 …線通訊產品上，達成縮小化且多賴作之通訊功能。' 第2圖為本發明天線一實施例i的返回損失實驗量測 …果^實施例i中’我們選擇該接地面13之長度為· 、寬度為200_ ;該輕射金屬臂14之長度為、 寬度為1mm，而該饋人點141與接地面之上方邊緣ΐ3ι之 距離t為0.5臟，且該輕射金屬臂與接地面之距離h⑷ mm ;該寄生短路金屬臂15之長度為21_、寬度為15 mm，而該寄生短路金屬臂之末端152與該輕射金屬臂之 末端142之距離d4〇.5mm，且該輕射金屬臂與接地面之 ，離h2為6.5麵；該饋入傳輸線16為一同軸傳輸，線；該介 質基板17為-厚度為〇.8mm^FR4玻璃纖維基板。由所 實驗結，’在返回損失小於1GdB較義下，該操作頻寬 可以涵蓋目前無線區域網路所需之24GHz頻帶以4〜 2.484 GHz)及 5GHz 頻帶〔包含 5.2GHz 頻帶（5.15〜5.35 及5.8GHz頻帶（5.725〜5 825 GHz)〕之操作需求。 第3圖為本發明天線一貪施例1在x-z.、y_z平面（‘ 垂直面）及x-y平面（水平面；假設地面平行於巧平面 )於2450MHz的天線輕射場型量測結果；第4圖為本發明 天線一貫施例1在x-z、y_z平面（垂直面）及巧平面 (水平面）於5500 MHz的天線輕射場型量測結果。由量測 1330904 結果可知，天線的主極化輻射均呈現垂直極化 Θ — , ^ 特性》 ”、7、面）產生大致為全向性輻射之場型， ^足無線區域網路系統之操作需求，同時在^平面（水 、’面）之垂直極化（Ee)分量與水平極化（叫分量相近 具有抵抗複雜環境所產生之多重路徑衰減之功能。 、 第5圖為本發明天線之第一其他實施例結構圖 知例5與貫施例1之不同在於：一輻射金屬臂％具有一 始端541肖一末端542，而在該輻射金屬臂之起始 與末端542之間具有一條支路543，且該支路⑷為 =金屬臂54及該寄生短路金屬臂15所包圍。在本實施例^ 二= 畐射金屬臂54及該寄生短路金屬臂15由印刷或餘刻 介質基板17上；由以上配置方式可以在天線 同頻頻帶額外產生一共振模態，同時得到良好之阻抗匹配 所，而獲得足夠之操作頻寬，即可涵蓋目前無線區域網路 =之2.4GHz頻帶及5舰㈣之操作需求，且本發明天 H料化天線設狀優點，適合制於無線通訊產品 達成、％小化且多頻操作之通訊功能。 ”本發明天線之第二其他實施例結構圖。本實 :::::施例丄之不同在於:一寄生短路金屬臂65具有 於端6。51 與一末端652 ’而在該寄生短路金屬臂之起 652 1具有—條支路653 ’且該支路 本竇:4李田射金屬臂14及該寄生短路金屬臂65所包圍。在 印刷二中，'亥輻射金屬臂14及該寄生短路金屬臂65由 或餘刻技術形成於—介質基板Π上，·由以上配置方式1330904 IX. Description of the Invention: [Technical Field] The present invention relates to a built-in antenna, and more particularly to a built-in multi-frequency antenna suitable for use in a wireless communication product. [Prior Art] With the development of wireless communication, the application of wireless networks is more and more extensive, so the performance of the antenna becomes one of the important keys affecting the value of the product. Related prior art includes Taiwan Patent Publication No. 563,274, Dual Frequency Antenna, which discloses an example of designing an inverted F-shaped antenna on the ground plane by using a built-in ground plane of a notebook computer LCD screen, but the antenna Although it is applicable to U GHz, 5 GHz (including 5 2, 5 8 GHz) dual-band wireless local area network system, the high-frequency bandwidth only barely includes the band of 5.2, 5·8 GHz, so that the antenna is mass-produced. The allowable error in production is low. To solve this problem, we propose an innovative design of a built-in multi-frequency antenna that can operate in a wireless local area network (WLAN) with multiple frequencies, not only generating a low-frequency operating band covering the wireless local area network 24 GIfe band ( 24~ 2-484 GHz), which can generate an operating frequency of about 1.8 in the high-frequency operating band. 'Easy to cover the wireless local area network 5 GHz band (including 5 2 service frequencies: (5.15 to 5.35 GHz) and 5.8 The demand for the GHz band (5.625~5.825 GHz)' greatly improves the allowable error in the fabrication of the antenna of the present invention during mass production, and the antenna of the present invention has the advantages of reduced antenna design, and is suitable for use in ..., line communication products. 'Achieve a reduced and multi-frequency communication function. 13-30904 [Description of the Invention] As described above, an object of the present invention is to provide an innovative design of a built-in multi-frequency antenna, and an embodiment of the antenna of the present invention can operate in a wireless area network at multiple frequencies, not only Producing a low-frequency operating band covering the 2.4 GHz band (2.4 to 2.484 GHz) of the wireless local area network, and generating an operating bandwidth of about 1.8 GHz at a high-frequency operating frequency π, easily covering the wireless local area network 5 GHz The operational requirements of the frequency band [including the 5.2 GHz band (5.15 to 5.35 GHz) and the 5.8 GHz band (5.925 to 5.825 GHz)] greatly increase the allowable error in the fabrication of the antenna of the present invention during mass production, and the antenna of the present invention has a reduced antenna The advantages of the design are suitable for use in wireless communication products, achieving communication functions of reduced and multi-frequency operation. The antenna of the present invention comprises a ground plane having a substantially rectangular shape and having an upper edge, and having a grounding point and a short-circuit point near the upper edge; and a radiating metal arm having a shape substantially f-inverted by W' The upper edge of the ground plane has a starting end and an end end. The starting end is located near the upper edge of the grounding surface, and the upper edge of the surface has a first specific distance and is the antenna 2 The end is substantially parallel to the upper edge of the ground plane. The light-emitting metal arm of the sea is used to generate the antimony-parasitic short circuit, which is a resonance mode of the frequency band and the frequency band; the shape above the surface is substantially an inverted shape, and is located at the upper edge of the ground, which has a starting path to the short side of the grounding surface, the end of the starting point is drawn, and the end extends toward the radiating metal arm in the direction of the radiant metal arm, and the parasitic short circuit The metal arm and the: the first-specific low frequency operating frequency band - 〃, μ * is the arm used to generate the resonance of the antenna (four) and the other higher frequency one of the resonant mode 7 1330904 state; and a feed transmission line for The transmission signal includes: a center wire connected to the starting end of the radiating metal arm; and an outer grounding conductor connected to the grounding point of the grounding surface; and the radiating metal arm and the parasitic shorting metal arm are printed or etched by the technique Formed on a dielectric substrate. ^ In this design, we can generate a resonant mode of the antenna high frequency band by appropriately adjusting the length of the radiating metal arm, and the length of the radiating metal arm is close to one of the resonant mode centers of the high frequency band. a frequency 〇.i5 ~ 0.25 wavelength; and by appropriately adjusting the length of the parasitic short-circuit metal arm, generating one of the antenna low-frequency operating frequency band resonance mode and another higher frequency-co-subtracting state, and the parasitic short-circuit metal The sum of the lengths of the arm and the (four) metal arm is close to the frequency of the resonant mode center of the low frequency operating band = 〜0·25 wavelength; and the distance between the radiating metal arm and the ground plane is adjusted (the hl in Fig. 1) Generally, it is larger than, and the distance between the parasitic short-circuited metal arm and the ground plane is adjusted (坌, h2 in the picture of the younger brother of this life, 1 is generally greater than 15 mm). At the same time, the feeding point of the metal arm of the yoke is appropriately adjusted. And t in the ground plane diagram, generally less than -, the distance between the 19-shot metal arm and the parasitic short-circuited metal arm (d1 in the figure 1 : generally less than Μ, can obtain good impedance matching, and thus can fully cover the current no One day required for the local area network: "U # is required, and the antenna of the present invention has the advantages of reducing the size of the antenna δ, and is suitable for the application and multi-frequency operation communication function. On the heart rate °, the reduction is achieved 1330904. Referring to Fig. 1, the present invention has a range of 1; & π AU, an internal multi-frequency antenna, an embodiment of the present invention, a ground plane 13, a makeup woman && It is a rectangle having an upper side: two sides of the upper edge 131 having a grounding point 132 and a: 33; a light-emitting metal arm 14 having a substantially inverted-L shape, located above the grounding surface At the edge 131, it has a starting end (4) and a terminal M2. The starting end 141 is located near the upper edge (3) of the grounding surface, and has a first specific distance t' and an antenna with the upper edge m of the grounding surface. The feeding point 彳41, Shishan Shuo eight points 141, and the end 142 is substantially parallel to the upper side of the grounding surface, ηι , $ & printing work 々 缘 edge 131, the radiating metal arm 14 is used to generate One of the high frequency operating bands of the antenna, resonant mode 22; a parasitic short circuit metal Μ, the shape is substantially an inverted L shape, located at an upper edge ΐ3ι of the ground plane ′ having a start end 151 and an end 152, the start # 151 being short-circuited to the short-circuit point 133 of the ground plane, and the end The 152 extends toward the end 142 of the radiating metal arm, and has a second specific distance d from the end 142 of the radiating metal arm, and the parasitic shorting metal arm 15 and the radiating metal arm 1 - 4 are used to generate an antenna low frequency. a resonant mode 21 of the operating band and a resonant mode 23 of the other-higher frequency; and a feed transmission line 16 for transmitting a signal 'includes·· a center conductor 161 connected to the beginning of the radiating metal arm The ground conductor 162 is connected to the grounding point 132 of the ground plane. In the present embodiment, the radiating metal arm 14 produces a resonant mode 22 and a higher resonant frequency of the higher frequency resonant mode 23 generated by the radiating metal arm 14 and the parasitic shorting metal arm 15 Frequency operation band; and the radiation metal arm 14 and the parasitic short metal arm 15 are formed on the dielectric substrate 17 by printing or 9 1330904; the above configuration can achieve good impedance matching, thereby obtaining sufficient operation frequency Wide, can be culvert: The current 24 GHz band and 5 touch band required by the wireless local area network 求 = seeking 'and the antenna of the present invention has the advantages of reduced antenna design, suitable for ... line communication products, achieving downsizing and more Communication function. 2 is a return loss experimental measurement of an embodiment i of the antenna of the present invention. In the embodiment i, we select the length of the ground plane 13 to be · and the width is 200_; the length of the light metal arm 14 is The width is 1 mm, and the distance t between the feed point 141 and the upper edge ΐ3 of the ground plane is 0.5 dirty, and the distance between the light metal arm and the ground plane is h(4) mm; the length of the parasitic short metal arm 15 is 21_, The width is 15 mm, and the distance between the end 152 of the parasitic short-circuited metal arm and the end 142 of the light-emitting metal arm is d4〇.5 mm, and the light-emitting metal arm and the ground plane are 6.5 faces from h2; The transmission line 16 is a coaxial transmission line; the dielectric substrate 17 is a glass fiber substrate having a thickness of 〇.8 mm^FR4. From the experimental conclusion, 'when the return loss is less than 1GdB, the operation bandwidth can cover the current 24 GHz band of the wireless local area network (4 to 2.484 GHz) and the 5 GHz band (including the 5.2 GHz band (5.15 to 5.35 and Operational requirements of the 5.8 GHz band (5.725 to 5 825 GHz)] Figure 3 is an antenna of the present invention in the xz., y_z plane ('vertical plane) and xy plane (horizontal plane; assuming the ground is parallel to the coincidence plane) The measurement results of the antenna light field type at 2450 MHz; Fig. 4 shows the measurement results of the antenna light field type of the antenna of the invention in the xz, y_z plane (vertical plane) and the plane (horizontal plane) at 5500 MHz. From the results of measurement 1330904, it can be seen that the main polarized radiation of the antenna exhibits vertical polarization Θ - , ^ characteristics " ”, 7, surface) to generate a field of omnidirectional radiation, and the operation of the wireless local area network system Demand, at the same time, the vertical polarization (Ee) component of the ^ plane (water, 'surface) and the horizontal polarization (called similar components have the function of resisting multiple path attenuation caused by complex environments. Figure 5 is the antenna of the present invention. First other Example 5 is different from the first embodiment in that a radiating metal arm % has a starting end 541 and a distal end 542, and a branch 543 is formed between the beginning and the end 542 of the radiating metal arm. And the branch (4) is surrounded by the metal arm 54 and the parasitic short metal arm 15. In the embodiment, the second metal arm 54 and the parasitic short metal arm 15 are printed or etched on the dielectric substrate 17; The above configuration method can additionally generate a resonance mode in the same frequency band of the antenna, and at the same time obtain a good impedance matching, and obtain sufficient operation bandwidth, which can cover the current wireless local area network = 2.4 GHz band and 5 ships (four) The operation requirement, and the advantages of the invention of the invention, is suitable for the communication function of the wireless communication product, the miniaturization and the multi-frequency operation. The structure diagram of the second other embodiment of the antenna of the invention. The :::: embodiment differs in that a parasitic short metal arm 65 has a terminal 6. 51 and an end 652 ' and a strip 653 ' between the parasitic short metal arm 652 1 and the branch Ben Dou: 4 Li Tian shooting metal arm 14 and the A short circuit in the metal arm 65 surrounded by two printing, the 'hai radiation metal arm 14 and the arm 65 by the parasitic shorting metal lithography is formed on or I - on a dielectric substrate Π, · by the above arrangement