1241743 九、發明說明： 【發明所屬之技術領域】 本發明侧於-種全向性平面單極天線，特別是可應用在無線區域網 路(wireless local area network，WLAN)橋接點(access p〇int)上的高增益全向 性天線。 【先前技術】 隨著無線通訊產業的快速發展，無線區域網路的應用也越來越廣泛， 因此’具有高增益且全向性輕射的橋接點天線設計也漸受重視。同時，為 了降低製作成本與增加效能，也必須考量其製作方式與結構之改善。 鲁 目前習知應用於無線區域網路橋接點之天線大都是以偶極天線與單極 天線為主’如第8圖所示，為常見之偶極天線結構，其具有全向性之輕射場 型但其增益僅約2.2 dBi，且其具有較複雜之天線結構，又如中華民國專利 第529783號"偶極天線設計"，此專利所揭示的是一種改良式的偶極天線，其 為-平面結構，且具有h解紐定之躲，但此天線之增益與一 般偶極天線之增益並無太大的差別。在本發明中，我們提出一種具有全向 性平面單極天_設計’該天線核可平面印概竹基板崎低成本，# 並運用貫孔技術以充分利用介質基板上下表面，增加輕射金屬線段，藉以 提馬天線增盈’且其結構簡單’製作容易，並具有良好的效能。 、 【發明内容】 如上所述，本發明之目的在於提供一種具有高增益且全向性轄射之單 極天線’其增益可達約5.2姻’且天線結構簡單，並可輕易地以印刷或餘 職術形成於-介質基板上。本發明天線主要包含：一介質基板一接地 1241743 *幸田射金屬、線第一輪射金屬線及一饋入同轴傳輸線。該介質 土板:、=帛一表面、一第二表面及一貫孔貫穿該介質基板連接該第-表 面及σ亥弟-表面。該接地面，豆卜且女... ^ 其上具有—接地點。該第-輻射金屬線位於 该介質基板之該第-表面上，主要包含第—子金屬線，朝向遠離該接地 面之方向延伸，長度大致_天線中吨作辭之Μ波長具有一第一端 點及—相對於該第-端點之第二端點，且在該第—端點處具有 一天線饋入 點，該第-端點與該接地面之間並具有一小於3咖之間隙；一第二子金屬 線，具有-起始點及-終點，該起始點至該終點之長度大致為該天線中心 操作頻率之1/2波長，且該起始點與鱗敗有3次壯之騎，使得該 第二子金屬_成-奴料形狀，該起始點並連接至該第—子金屬線之 該第二端點；—第三子金屬線’長度大致為該天線中心操作鮮之1/2波長， 且與該第—子金屬線之延伸額大致相同，該第三子金屬線之—端點並連 接至該第二子金屬線之該終點。該第二_金屬線位於該介質基板之該第 二表面上’紐大料該天財心操作醉之1/4波長，鮮二輻射金屬線 之一端點經由該介板的該貫孔連接·第三子金屬狀—端點，該第 二輕射金>1線之另-賴(開口端)_向該接地面方向延伸，使得該第二輕 射金屬線對應於該第-表面之區有該第三子金屬線。該饋人同轴傳輸 線，主要包含：一中心導線’連接至該第一子金屬線之該天線饋入點；及 一外層接地導體，連接至該接地面之該接地點。 在本項a又什中，我們可藉由調整該第一輻射金屬線之該第一子金屬 線，該第二子金屬線、該第三子金屬線及該第二輻射金屬線之長度分別接 1241743 近該天線之中心操作頻率之1/4、1/2、1/2及1/4波長，使其該第一子金屬 線4弟二子金屬線及该弟一輕射金屬線具有相同方向之電流，而與該第 一子金屬線之電流相反。同時，經由將該第二子金屬線彎折，形成一迂迴 %折形狀，可以有效地抑制該第二子金屬線上之反向電流對整個天線全向 性輻射場型之影響。如此，該第一子金屬線、該第三子金屬線及該第二輻 射金屬線上之同向電流的合成輻射可以使得本設計天線之增益達到約52 dBi。而藉由調整該第一輻射金屬線之長度，可改變該天線之中心操作頻 率；藉由調整該接地面之大小及該第一輻射金屬線之該第一子金屬線之線 寬，可得到本發明天線良好阻抗匹配與阻抗頻寬。由以上特性，1我們即可鲁 以輕易設計出適用於無線區域網路2.4 GHz頻帶操作之天線。 【實施方式】 第1圖是本發明天線之一實施例1，包含··一介質基板19、一接地面u、 一第一輻射金屬線12、一第二輻射金屬線16及一饋入同軸傳輸線18。該介 質基板19具有一第一表面191、一第二表面192及一貫孔17貫穿該介質基板 19連接該第一表面191及該第二表面192。該接地面Η，其上具有一接地點 ill。該第一輻射金屬線12位於該介質基板19之該第一表面上191，主要包鲁 含··一第一子金屬線13，朝向遠離該接地面η之方向延伸，長度大致為該天 線中心操作頻率之1/4波長，具有一第一端點131及一相對於該第一端點i3i 之第一知點132，且在邊第一端點131處具有一天線饋入點I%，該第一端點 131與該接地面π之間並具有一小於3 之間隙d ; 一第二子金屬線ι4，具 有一起始點141及一終點142，該起始點141至該終點142之長度大致為該天 線中心操作頻率之1/2波長，且該起始點141與該終點M2之間具有3次以上之 1241743 等折，使得該第二子金屬線14形成一迁迴彎折形狀，該起始點⑷並連接至 該第-子金屬肋之該第二端點132第三子金屬線15，長度大致為該天 線中心操作頻率之1/2波長，且與該第—子金屬線13之延伸方向大致相同， .玄第一子金騎b之—端點1M並連接至該第二子金屬線μ之該終點⑷。 該第二輻射金屬線16位於該介質基板I9之該第二表面192上，長度大致為該 天線中心操作頻率之1/4波長，該第二輕射金屬線16之一端點161經由該介質 基板19的e亥貝孔17連接至該第三子金屬祕之一端點⑸，該第二輕射金屬 線16之另鳊點(開口端)162則朝向該接地面η方向延伸，使得該第二輻射 金屬線16對應於該第—表面191之區間僅有該第三子金屬線15。該饋入同輛 傳輸線18，主要包含··一中心導線18卜連接至該第一子金屬線此該天線 饋入點133 ;及一外層接地導體182，連接至該接地面11之該接地點1U。其 中該接地面Η、該第-輕射金屬線12及該第二輕射金屬線16由印刷或颠刻 技術形成於一介質基板19上。 第2圖是本發明天線之一實施例丨的返回損失實驗量測結果圖，我們選 擇該接地面11長度約為3〇_、寬度約為10mm;選擇該第一子金屬線13長 度約為26mm、寬度約為3 _，且該第一子金屬線13之該第一端點131與該 接地面11之間隙約為1 選擇該第二子金屬線14長度約為1〇2_、寬度 約為0.5 mm，且具有約8次彎折；選擇該第三子金屬線15長度約為56_、 寬度約為1 mm ;選擇該第二輻射金屬線16長度約為26 _、寬度約為3 mm ’選擇一介電係數為4.4之玻纖基板。由所得實驗結果，在返回損 失的疋義下，其天線操作模態的阻抗頻寬達160 MHz，可涵蓋無線區域網路 11 1241743 (2400-2484 MHz)操作頻帶。 第3圖為本發明天線之一實施例1於2442 MHz的天線輻射場型量測結 果。由所得實驗結果，天線於χ-y平面具有一全向性輻射之場型，且增益可 達約5.2dBi。 第4圖為本發明天線之一實施例丨之天線增益量測結果。由所得實驗結 果，操作頻帶内的天線增益約為5·〇_5·2 dBi，滿足一般2·4 GHz無線區域網 路操作的增益需求。 第5圖為本發明天線的其他實施例5之結構圖，其中該第二輻射金屬線 56之_ 口端處562具有一狹縫563。加入該狹縫563後，該第二輕射金屬線 56可形成兩個電流同向之支路，因此可以略為增加該天線之增益。 第6圖為本發明天線另一其他實施例6之結構圖，主要包含··一介質基 板69、ϋ射金屬線a、—第二輕射金麟66及—微帶傳輸線^。該 介質基板69，具有-第一表面69卜一第二表面692及一貫孔67貫穿該介質 基板69連接該第-表面691及該第二表面败。該第一輕射金屬線⑹，位於 該介質基板，第-表面691上，主要包含：一第一子金屬線幻，長度大致 為該天線中心操作頻率之1/4波長，具有一第一端點631及一相對於該第一端 點631之第二端點632 ; -第二子金屬線64，具有一起始點641及一終點⑷， 該起始點641至該終點642之長度大致為該天線中心操作頻率之1/2波長，且 該起始點64L與該終點642之間具有3次以上之彎折，使得該第二子金屬_ 形成-迁迴弯折形狀，該起始點⑷並連接至該第一子金屬線幻之該第二端 點632卜第三子金屬線65，長度大致為該天線中心操作頻率之1/2波長，且 12 1241743 與该第一子金屬線63之延伸方向大致相同，該第三子金屬線6S之一端點65r 並連接至該第二子金屬線64之該終點642。該第二輻射金屬線66，位於該介 貝基板69之該第二表面692上，長度大致為該天線中心操作頻率之1/4波長， 該第二輻射金屬線66之一端點661經由該介質基板69的該貫孔67連接至該 第一子金屬線65之一端點652，該第二輻射金屬線66之另一端點(開口端)662 則朝向該第一子金屬線63方向延伸，使得該第二輻射金屬線66對應於該第 表面691之區間僅有該第三子金屬線65。該微帶傳輸線61，主要包含··一 金屬線611，位於該介質基板69之該第一表面691上，並連接至該第一子金 屬線63之该弟一端點631 ;及一接地面612，位於該介質基板69之該第二表 面692之部分區間，且該部分區間對應於該第一表面691之區間僅包含該金 屬線611。其中該第一輻射金屬線62、該第二輻射金屬線66與該微帶傳輸線 61由印刷或蝕刻技術形成於該介質基板矽上。在本實施例6中，天線由一微 帶傳輸線61所饋入，其他結構則與實施例丨中相同。 第7圖為本發明天線另一其他實施例7之結構圖，主要包含：一介質基 板79、一第一輻射金屬線72、一第二輻射金屬線76及一共面波導傳輸線7卜 邊介質基板79，具有-第-表面79卜一第二表面792及一貫孔77貫穿該介 質基板79連接該第-表面791及該第二表面792。該第—傭金屬線72，位 於該介質基板79之該第-表面791上，主要包含：—第—子金屬線η，長度 大致為該天線中心操作頻率之1/4波長，具有一第一端點731及一相對於該第 一端點731之第二端點732 ;—第二子金屬線74，具有—起始點741及一終點 742 ’該起始點741至該終點742之長度大致為該天線中心操作頻率之1/2波 13 1241743 長，且該起始訓與該終細之間具有3次以上之彎折，使得該第二子金 聽7W成-迁迴彎折形狀，該起難741並連接至該第—子金麟乃之該 第端,占732，-第二子金屬線75，長度大致為該天線中心操作頻率之μ 波長’且與該第-子金屬線73之延伸方向纽_，該第三子金屬線乃之 一端點751並連接至該第二子金屬線74之該終點742。該第二輕射金屬線 76 ’位於該介質基板79之該第二表面792上，長度大致為該天線中心操作頻 率之1/4波長，該第二輕射金屬線76之-端點761經由該介質基板π的該貫孔 77連接至該第三子金屬線75之—職752，該第二輻射金屬線％之另一端點 (開口端)762則朝肖該第一子金屬線73方向延伸，使得該第二輕射金屬線％ 對應於該第-表面791之區間僅有該第三子金屬線75。該共面波導傳輸線 7卜主要包含：-中心金屬線711，連接至該第一子金屬線73之該第一端點 731卜第-接地面712 ’位於該中心金屬線711之一側邊，且該第一接地面 712係對應於該中心金屬線711之長度；一第二接地面713，位於該中心金屬 線711之另-側邊’且該第二接地面713係對應於該中心金屬線川之長度。 其中該第-轉射金屬線72、該第二輻射金屬線76與該共面波導傳輸線刀由 印刷或钮刻技術形成於-介質基板79上。在本實施例7中，天線由一共面波 導傳輸線71所饋入，其他結構則與實施例丨中相同。 綜合上述的說明，本發明天線的結構簡單，製作成本低，功能明確， 因此本發明天線甚具南度產業應用價值，足以符合發明之範缚。 在上述說明中所敘述之實施例僅為說明本發明裝置之原理及其功效， 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 14 1241743 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 【圖式簡單說明】 第1圖為本發明之全向性平面單極天線一實施例結構圖； 第2圖為本發明天線一實施例之返回損失量測結果； 第3圖為本發明天線一實施例之輻射場型量測結果； 第4圖為本發明天線一實施例之天線增益量測結果； 第5圖為本發明全向性平面單極之其他實施例結構圖； 第6圖為本發明全向性平面單極之其他實施例結構圖； 第7圖為本發明全向性平面單極之其他實施例結構圖； 第8圖為習知之偶極天線之結構圖。 【主要元件符號說明】 is本發明之單極天線一實施例 152〜第三子金屬線之一端點 1( ^1〜第二輻射金屬線之一端點 —第二輻射金屬線之一端點(開口端) 11 一接地面 U—第一輻射金屬線 131—第一子鲞屬線之第一端點 133 一天線饋入點 141〜第二子金屬線之起始點 15—第三子金屬線 111 一接地點 13—第一子金屬線 132 —第一子金屬線之第二端點 14一第二子金屬線 142 —第二子金屬線之終點 151—第三子金屬線之一端點 16—第二輻射金屬線， 15 1241743 17 一貫孔(via-hole) 18—饋入同軸傳輸線 181— 饋入同軸傳輸線之中心導線 182— 饋入同軸傳輸線之外層接地導體 19 一介質基板 191 一介質基板之第一表面 192—介質基板之第二表面 d—第一子金屬線之第一端點與接地面之間隙寬度 5—本發明之單極天線其他實施例 51—接地面 511—接地點 52—第一轄射金屬線 53—第一子金屬線 531—第一子金屬線之第一端點 532—第一子金屬線之第二端點 533—天線饋入點 54—第二子金屬線 541—第二子金屬線之起始點 542—第二子金屬線之終點 55—第三子金屬線 551~第三子金屬線之一端點 552—第三子金屬線之一端點 56—第二輻射金屬線 561—第二輻射金屬線一端點 562一第二輻射金屬線一端點(開口端） 563--狹縫 57—貫孔(via-hole) 58 一饋入同軸傳輸線 581—饋入同軸傳輸線之中心導 582—饋入同軸傳輸線之外層接地導體 59—介質基板 591—介質基板之第一表面 592—介質基板之第二表面 16 1241743 d—第一子金屬線之第一端點與接地面之間隙寬度 662—第二輻射金屬線之一端點(開口端) 67一貫孔(via-hole) 691—介質基板之第一表面 / 7—本發明之單極天線其他實施例 711—共面波導傳輸線之中心金屬線 6—本發明之單極天線其他實施例 611—金屬線 62—第一輻射金屬線 631—第一子金屬線之第一端點 64—第二子金屬線 642—第二子金屬線之終點 651—第三子金屬線之一端點 66—第二輻射金屬線 713—共面波導傳輸線之第二接地面 73一第一子金屬線 732—第一子金屬線之第二端點 741—第二子金屬線之起始點 75—第三子金屬線 752—第三子金屬線之一端點 61—微帶傳輸線 612—接地面 63 —第一子金屬線 632—第一子金屬線之第二端點 641—第二子金屬線之起始點 65—第三子金屬線 652—第三子金屬線之一端點 661—第二輻射金屬線之一端點 69—介質基板 692—介質基板之第二表面 71— 共面波導傳輸線 712—共面波導傳輸線之第一接地面 72— 第一輕射金屬線 731—第一子金屬線之第一端點 74 —第二子金屬線 742—第二子金屬線之終點 751—第三子金屬線之一端點 76—第二轄射金屬線 17 1241743 761— 第二幸S射金屬線之^一端點 762— 第二輻射金屬線之一端點(開口端) 77—貫孔(via-hole) 79—介質基板 791—介質基板之第一表面 792—介質基板之弟二表面 8—偶極天線 81—偶極天線之負端 82—偶極天線之正端 86—饋入同轴傳輸線 (A)—正視圖 （B)—側視圖 （C) 後視圖 181241743 IX. Description of the invention: [Technical field to which the invention belongs] The present invention focuses on an omnidirectional planar monopole antenna, especially applicable to a wireless local area network (WLAN) bridging point (access p0). int) high gain omnidirectional antenna. [Previous technology] With the rapid development of the wireless communication industry, the application of wireless local area networks is becoming more and more widespread. Therefore, the design of bridge point antennas with high gain and omnidirectional light emission is also receiving increasing attention. At the same time, in order to reduce production costs and increase efficiency, we must also consider the improvement of its production method and structure. Most of the antennas currently used in bridge points of wireless LANs are mainly dipole antennas and monopole antennas. As shown in Figure 8, it is a common dipole antenna structure, which has an omnidirectional light field. Type, but its gain is only about 2.2 dBi, and it has a more complex antenna structure, as in the Republic of China Patent No. 529783 " dipole antenna design ". This patent discloses an improved dipole antenna. It is a -planar structure and has a solution of h-determined hiding, but the gain of this antenna is not much different from that of a general dipole antenna. In the present invention, we propose an omnidirectional planar monopole sky design. The antenna can be printed on a bamboo substrate with a low cost. # And the through-hole technology is used to make full use of the upper and lower surfaces of the dielectric substrate to increase light-emitting metal. The line segment is used to increase the profit of the antenna, and its structure is simple. It is easy to make and has good performance. [Summary of the Invention] As mentioned above, the object of the present invention is to provide a monopole antenna with a high gain and omnidirectional radiation, whose gain can reach about 5.2 marriages, and the antenna structure is simple, and can be easily printed or The aftermath is formed on a dielectric substrate. The antenna of the present invention mainly includes: a dielectric substrate and a ground 1241743 * Kota shot metal, wire first round shot metal wire, and a feed coaxial transmission line. The dielectric soil plate :, a first surface, a second surface, and a through hole penetrating the dielectric substrate to connect the first surface and the sigma-surface. This ground plane, Doubi and female ... ^ has-a ground point on it. The -radiation metal wire is located on the -surface of the dielectric substrate, and mainly includes the first sub-metal wire, which extends in a direction away from the ground plane. The length of the M-wavelength ton in the antenna has a first end. Point and—a second end point relative to the first end point and an antenna feed point at the first end point, the gap between the first end point and the ground plane and a gap less than 3 cm ; A second sub-metal wire with -starting point and -endpoint, the length from the starting point to the end point is approximately 1/2 the wavelength of the center operating frequency of the antenna, and the starting point and the scale are lost 3 times The strong ride makes the second sub-metal into a slave material shape, the starting point is connected to the second end of the first sub-metal wire; the third sub-metal wire 'length is approximately the center of the antenna The fresh half wavelength is operated and is substantially the same as the extension of the first sub-metal wire, and the end of the third sub-metal wire is connected to the end of the second sub-metal wire. The second _ metal wire is located on the second surface of the dielectric substrate. The material of the New Caixin Xincai operation is 1/4 wavelength, and one end of the fresh second radiation metal wire is connected via the through hole of the dielectric board. Third sub-metallic-end point, the second light-emitting gold > 1 line of the other-lai (open end) _ extends toward the ground plane, so that the second light-emitting metal line corresponds to the first surface The area has the third sub-metal wire. The feeder coaxial transmission line mainly includes: a center wire 'connected to the antenna feed point of the first sub-metal wire; and an outer ground conductor connected to the ground point of the ground plane. In this item a, we can adjust the lengths of the first sub-metal wire, the second sub-metal wire, the third sub-metal wire, and the second radiating metal wire respectively Connect 1241743 near the center of the antenna's operating frequency of 1/4, 1/2, 1/2, and 1/4 wavelengths, so that the first child metal wire, the second child metal wire, and the first light metal wire have the same The current in the direction is opposite to the current of the first sub-metal wire. At the same time, by bending the second sub-metal wire to form a circuitous% fold shape, the influence of the reverse current on the second sub-metal wire on the entire antenna isotropic radiation field pattern can be effectively suppressed. In this way, the combined radiation of the currents in the same direction on the first sub-metal wire, the third sub-metal wire and the second radiating metal wire can make the gain of the antenna of the design reach about 52 dBi. By adjusting the length of the first radiating metal wire, the center operating frequency of the antenna can be changed; by adjusting the size of the ground plane and the line width of the first sub-metal wire of the first radiating metal wire, it can be obtained The antenna of the invention has good impedance matching and impedance bandwidth. From the above characteristics, we can easily design antennas suitable for wireless LAN operation in the 2.4 GHz band. [Embodiment] FIG. 1 is a first embodiment of an antenna of the present invention, including a dielectric substrate 19, a ground plane u, a first radiating metal wire 12, a second radiating metal wire 16, and a feed coaxial Transmission line 18. The dielectric substrate 19 has a first surface 191, a second surface 192, and a through hole 17 penetrating the dielectric substrate 19 to connect the first surface 191 and the second surface 192. The ground plane Η has a ground point ill thereon. The first radiating metal wire 12 is located on the first surface 191 of the dielectric substrate 19, and mainly includes a first sub-metal wire 13 extending in a direction away from the ground plane η, and the length is approximately the center of the antenna. 1/4 wavelength of operating frequency, has a first end point 131 and a first known point 132 relative to the first end point i3i, and has an antenna feed point I% at the side first end point 131, The first end point 131 and the ground plane π have a gap d less than 3; a second sub-metal wire ι4 has a starting point 141 and an ending point 142, and the starting point 141 to the end point 142 The length is approximately 1/2 the wavelength of the center operating frequency of the antenna, and there is an equidistance of 1241743 between the starting point 141 and the ending point M2 more than three times, so that the second sub-metal wire 14 forms a bent back shape , The starting point is connected to the second end point 132 of the first sub-metal rib, and the third sub-metal wire 15 is approximately 1/2 the wavelength of the center operating frequency of the antenna, and is equal to the first sub-metal rib. The extension direction of the line 13 is approximately the same. The first child Jinqi b—the end point 1M and connected to the second child metal The end point of μ ⑷. The second radiating metal wire 16 is located on the second surface 192 of the dielectric substrate I9, and is approximately 1/4 wavelength of the center operating frequency of the antenna. An endpoint 161 of the second light emitting metal wire 16 passes through the dielectric substrate. The eBay hole 17 of 19 is connected to an end point 第三 of the third sub-metal, and the other point (open end) 162 of the second light-emitting metal wire 16 extends toward the ground plane η, so that the second The section of the radiating metal wire 16 corresponding to the first surface 191 has only the third sub-metal wire 15. The feed-in transmission line 18 mainly includes a central wire 18 connected to the first sub-metal wire and the antenna feed point 133; and an outer ground conductor 182 connected to the ground point of the ground plane 11. 1U. The ground plane Η, the first light-emitting metal line 12 and the second light-emitting metal line 16 are formed on a dielectric substrate 19 by printing or engraving technology. Fig. 2 is an experimental measurement result of return loss of an embodiment of the antenna of the present invention. We select the ground plane 11 to have a length of about 30 mm and a width of about 10 mm. The first sub-metal wire 13 is selected to have a length of about 26mm, the width is about 3 mm, and the gap between the first end point 131 of the first sub-metal line 13 and the ground plane 11 is about 1, the length of the second sub-metal line 14 is about 102, and the width is about Is 0.5 mm and has about 8 bends; the length of the third sub-metal wire 15 is about 56 mm and the width is about 1 mm; the length of the second radiation metal wire 16 is about 26 mm and the width is about 3 mm 'Select a glass fiber substrate with a dielectric constant of 4.4. From the obtained experimental results, under the meaning of return loss, the impedance bandwidth of the antenna operating mode is 160 MHz, which can cover the wireless LAN 11 1241743 (2400-2484 MHz) operating frequency band. Fig. 3 is a measurement result of the antenna radiation field pattern at 2442 MHz according to the first embodiment of the antenna of the present invention. From the obtained experimental results, the antenna has a field pattern of omnidirectional radiation in the χ-y plane, and the gain can reach about 5.2dBi. FIG. 4 is an antenna gain measurement result of an embodiment of the antenna of the present invention. From the experimental results obtained, the antenna gain in the operating frequency band is approximately 5.0 · 5 · 2 dBi, which meets the gain requirements of general 2.4 GHz wireless area network operation. FIG. 5 is a structural diagram of another embodiment 5 of the antenna of the present invention, wherein a slot 563 is formed at the mouth end 562 of the second radiation metal wire 56. After the slit 563 is added, the second light-emitting metal wire 56 can form two branches in the same direction of current, so the gain of the antenna can be slightly increased. FIG. 6 is a structural diagram of another embodiment 6 of the antenna of the present invention, which mainly includes a dielectric substrate 69, a shot metal wire a, a second light shot Jin Lin 66, and a microstrip transmission line ^. The dielectric substrate 69 has a first surface 69, a second surface 692, and a through hole 67 penetrating the dielectric substrate 69 to connect the first surface 691 and the second surface. The first light-emitting metal wire coil is located on the dielectric substrate, the first surface 691, and mainly includes: a first sub-metal wire magic, the length is approximately 1/4 wavelength of the center operating frequency of the antenna, and has a first end Point 631 and a second end point 632 relative to the first end point 631;-the second sub-metallic line 64 has a start point 641 and an end point ⑷, and the length from the start point 641 to the end point 642 is approximately 1/2 wavelength of the center operating frequency of the antenna, and there are more than 3 bends between the starting point 64L and the end point 642, so that the second sub-metal _ forms-moves back to a bent shape, the starting point And connected to the second end point 632 of the first sub-metal wire and the third sub-metal wire 65, which is approximately 1/2 the wavelength of the center operating frequency of the antenna, and 12 1241743 and the first sub-metal wire The extension direction of 63 is substantially the same. One end 65r of the third sub-metal wire 6S is connected to the end 642 of the second sub-metal wire 64. The second radiating metal wire 66 is located on the second surface 692 of the dielectric substrate 69 and has a length of approximately 1/4 wavelength of the center operating frequency of the antenna. An endpoint 661 of the second radiating metal wire 66 passes through the medium. The through hole 67 of the substrate 69 is connected to one end 652 of the first sub-metal wire 65, and the other end (open end) 662 of the second radiation metal wire 66 extends toward the first sub-metal wire 63, so that The interval between the second radiation metal line 66 and the first surface 691 is only the third sub-metal line 65. The microstrip transmission line 61 mainly includes a metal line 611 located on the first surface 691 of the dielectric substrate 69 and connected to an end point 631 of the first sub-metal line 63; and a ground plane 612 Is located in a portion of the second surface 692 of the dielectric substrate 69, and the portion of the portion corresponding to the first surface 691 includes only the metal line 611. The first radiation metal line 62, the second radiation metal line 66 and the microstrip transmission line 61 are formed on the dielectric substrate silicon by printing or etching technology. In the sixth embodiment, the antenna is fed by a microstrip transmission line 61, and other structures are the same as those in the first embodiment. FIG. 7 is a structural diagram of another embodiment 7 of the antenna of the present invention, which mainly includes: a dielectric substrate 79, a first radiating metal line 72, a second radiating metal line 76, and a coplanar waveguide transmission line 7. 79, which has a first surface 79, a second surface 792, and a through hole 77 penetrating the dielectric substrate 79 to connect the first surface 791 and the second surface 792. The first-commercial metal line 72, which is located on the first-surface 791 of the dielectric substrate 79, mainly includes:-the first sub-metallic line η, which is approximately 1/4 wavelength of the center operating frequency of the antenna and has a first End point 731 and a second end point 732 opposite to the first end point 731;-a second sub-metal wire 74 having-a start point 741 and an end point 742 'the length from the start point 741 to the end point 742 Approximately 1/2 wave of the center operating frequency of the antenna 13 1241743 long, and there are more than 3 bends between the initial training and the final fine, so that the second sub-jinting 7W into-return to the bent shape The difficulty 741 is connected to the first end of the first-sub-jinlinnai, occupying 732,-the second sub-metallic wire 75, the length is approximately the μ wavelength of the center operating frequency of the antenna, and the first sub-metal The extension direction of the line 73 is __, the third sub-metal line is an end point 751 and connected to the end point 742 of the second sub-metal line 74. The second light-emitting metal wire 76 ′ is located on the second surface 792 of the dielectric substrate 79 and is approximately 1/4 wavelength of the center operating frequency of the antenna. The through hole 77 of the dielectric substrate π is connected to the third sub-metal wire 75-752, and the other end (open end) 762 of the second radiant metal wire% is directed toward the first sub-metal wire 73. It is extended so that the interval of the second light shot metal line% corresponding to the first surface 791 is only the third sub metal line 75. The coplanar waveguide transmission line 7b mainly includes:-a central metal line 711, connected to the first end point 731 of the first sub-metal line 73, and a ground plane 712 'is located on one side of the central metal line 711, And the first ground plane 712 corresponds to the length of the center metal line 711; a second ground plane 713 is located on the other side of the center metal line 711; and the second ground plane 713 corresponds to the center metal The length of the line. The first transmission metal line 72, the second radiation metal line 76, and the coplanar waveguide transmission line cutter are formed on the -dielectric substrate 79 by a printing or button-engraving technique. In the seventh embodiment, the antenna is fed by a coplanar waveguide transmission line 71, and other structures are the same as those in the first embodiment. To sum up the above description, the antenna of the present invention has a simple structure, low manufacturing cost, and clear functions. Therefore, the antenna of the present invention has great industrial application value in South China and is sufficient to meet the scope of the invention. The embodiments described in the above description are only for explaining the principle of the device 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 embodiments described above without departing from the spirit of the present invention. The scope of the rights of the present invention should be as described in the patent application scope described below. [Schematic description] Figure 1 is a structural diagram of an embodiment of an omnidirectional planar monopole antenna of the present invention; Figure 2 is an embodiment of an antenna of the present invention. Return loss measurement results; Figure 3 is the radiation field type measurement results of an embodiment of the antenna of the present invention; Figure 4 is the antenna gain measurement results of an embodiment of the antenna of the present invention; Figure 5 is the omnidirectionality of the present invention Structure diagram of another embodiment of a planar unipolar structure; Figure 6 is a structure diagram of another embodiment of an omnidirectional planar monopole of the present invention; Figure 7 is a structure diagram of another embodiment of an omnidirectional planar monopole of the present invention; The picture shows the structure of a conventional dipole antenna. [Description of main component symbols] is an embodiment of the monopole antenna of the present invention 152 to one end of the third sub-metal line 1 (^ 1 to one end of the second radiating metal line-one end of the second radiating metal line (opening End) 11 a ground plane U—the first radiating metal wire 131—the first end point of the first daughter metal line 133 an antenna feeding point 141 ~ the starting point of the second child metal wire 15—the third child metal wire 111 A ground point 13—the first sub-metal wire 132—the second end of the first sub-metal wire 14-the second sub-metal wire 142—the end of the second sub-metal wire 151—the end of the third sub-metal wire 16 —Second radiating metal wire, 15 1241743 17 via-hole 18—Feeding coaxial transmission line 181—Feeding coaxial transmission line center conductor 182—Feeding coaxial transmission line outer ground conductor 19—Dielectric substrate 191—Dielectric substrate First surface 192—the second surface of the dielectric substrate d—the gap width between the first end of the first sub-metal wire and the ground plane 5—the other embodiment of the monopole antenna of the present invention 51—the ground plane 511—the ground point 52 —First jurisdiction shooting metal wire 53—First son Line 531—the first end of the first sub-metal wire 532—the second end of the first sub-metal wire 533—the antenna feed point 54—the second sub-metal wire 541—the starting point of the second sub-metal wire 542—the end of the second sub-metal wire 55—the third sub-metal wire 551 ~ the end of the third sub-metal wire 552—the end of the third sub-metal wire 56—the second radiation metal wire 561—the second radiation metal wire One end 562 one second radiating metal wire one end (open end) 563--slot 57--via-hole 58--feed coaxial transmission line 581--feed center coaxial guide 582--feed coaxial transmission line Outer ground conductor 59—dielectric substrate 591—the first surface of the dielectric substrate 592—the second surface of the dielectric substrate 16 1241743 d—the gap width between the first end of the first sub-metal wire and the ground plane 662—the second radiating metal One end of the line (open end) 67 via-hole 691—the first surface of the dielectric substrate / 7—the monopole antenna of the present invention other embodiments 711—the center metal line of the coplanar waveguide transmission line 6—the present invention Other monopole antenna 611—metal wire 62—the first radiation metal wire 631—the first end point of the first sub-metal wire 64—the second sub-metal wire 642—the end point of the second sub-metal wire 651—the end point of the third sub-metal wire 66—the second radiation Metal wire 713—the second ground plane of the coplanar waveguide transmission line 73—a first sub-metal wire 732—the second end point of the first sub-metal wire 741—the starting point of the second sub-metal wire 75—the third sub-metal wire 752—the end point of the third sub-metal wire 61—the microstrip transmission line 612—the ground plane 63—the first sub-metal wire 632—the second end point of the first sub-metal wire 641—the starting point of the second sub-metal wire 65 —Third sub-metal wire 652—One end of the third sub-metal wire 661—One end of the second radiating metal wire 69—Dielectric substrate 692—Second surface of the dielectric substrate 71—Coplanar waveguide transmission line 712—Coplanar waveguide transmission line The first ground plane 72—the first light metal wire 731—the first end point of the first sub metal wire 74—the second sub metal wire 742—the end point of the second sub metal wire 751—the end of the third sub metal wire Point 76—The second jurisdiction shoots metal wire 17 1241743 761— The second lucky S shoots metal wire ^ End point 762—one end of the second radiating metal wire (open end) 77—via-hole 79—dielectric substrate 791—first surface of the dielectric substrate 792—second surface of the dielectric substrate 8—dipole antenna 81—negative end of dipole antenna 82—positive end of dipole antenna 86—feed coaxial transmission line (A) —front view (B) —side view (C) rear view 18