557608 A7 _________B7_五、發明說明（1 )【發明領域】 本發明提供一種平面雙頻天線，特別是指一種能夠 傳送及接收符合IEEE802.11a及b標準之電磁波訊號， 並且有效增加傳送及接收符合IEEE 802.11a標準之電磁 5 波訊號的頻寬之平面雙頻天線。【發明背景】 如第一圖所示者為一種習知雙頻天線1，其具有一 饋入路徑11以及由饋入路徑11 一端朝同一方向垂直延 伸並且相隔一間距之一局頻天線部1 2及一低頻天線部 1 0 1 3 ’形成一類似音叉之形狀，該高頻天線部12主要工 作在2 · 4 G Η z，而低頻天線部1 3則是工作在1 800MHz 〇 而綜觀目前新興的無線區域網路（WLAN)， IEEE802.11b 以及由 IEEE802.11b 衍生出的 IEEE802.11a 15是現在最熱門的兩種無線通訊標準，符合iEEE8〇2.ilb 標準的電磁波主要工作在2.4GHz，其傳輸距離可以達 到1〇〇公尺或更遠，傳輸速度為11Mbps，適於供一般 無線上網，而 IE E E 8 0 2 · 1 1 a 標準雖可延續原來 IEEE8 02.1 1b的規格，但唯一差異就是頻寬與傳輸距離 20的不同，IEEE802.1 1a是工作在部分由政府管制的5GHz 頻帶，其傳輸距離僅支援至50公尺，但是提供54Mbps 的高傳輸速率，比IEEE802.1 lb增加了將近5倍的頻寬 ’可以滿足使用者處理大量資料的需求，然由於 IEEE802.1 U與lEEE802.1 1b工作頻段的不同，使得針 25對兩者所各別開發之單頻天線在空間考量下，並無法同 本紙張尺度適用中國國家鮮（CNS) A4規格（21Gx 297公爱) —-第4頁 裝557608 A7 _________B7_ V. Description of the invention (1) [Field of invention] The present invention provides a planar dual-band antenna, in particular, a type of antenna capable of transmitting and receiving electromagnetic waves in accordance with IEEE802.11a and b standards, and effectively increasing transmission and reception compliance. A planar dual-band antenna with the bandwidth of an electromagnetic 5-wave signal of the IEEE 802.11a standard. [Background of the Invention] As shown in the first figure, a conventional dual-frequency antenna 1 has a feeding path 11 and a local-frequency antenna section 1 extending vertically from one end of the feeding path 11 in the same direction and separated by a distance. 2 and a low-frequency antenna section 1 0 1 3 ′ form a tuning fork-like shape. The high-frequency antenna section 12 mainly works at 2.4 GHz, and the low-frequency antenna section 13 operates at 1 800 MHz. Emerging wireless local area network (WLAN), IEEE802.11b and IEEE802.11a 15 derived from IEEE802.11b are the two most popular wireless communication standards now. The electromagnetic wave conforming to the iEEE802.ilb standard mainly works at 2.4GHz. , Its transmission distance can reach 100 meters or more, the transmission speed is 11Mbps, suitable for general wireless Internet access, while the IE EE 80 2 · 1 1 a standard can continue the original IEEE8 02.1 1b specifications, but the only The difference is the difference between the bandwidth and the transmission distance of 20. The IEEE802.1 1a works in the 5GHz band partially regulated by the government. Its transmission distance only supports up to 50 meters, but it provides a high transmission rate of 54Mbps, which is an increase over IEEE802.1 lb. Up Nearly 5 times the bandwidth 'can meet the needs of users to process a large amount of data. However, due to the different operating frequency bands of IEEE802.1 U and lEEE802.1 1b, the 25 single-band antennas developed by the two are considered in space. It is not applicable to the Chinese national fresh (CNS) A4 specification (21Gx 297 public love) with the same paper size.-Page 4
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557608 A7 -------— _B7 五、發明說明（2 ) "" ' -- 時使用。因此，即使上述之雙頻天線Η接收兩種頻帶 的訊號，然而其可收發之頻帶範圍顯然無法同時支援 I一EEE802·lla及b，尤其是在IEEE8〇2 lu部分而且其 高頻天線部12受限於形狀設計，接收頻率及頻寬都相 5當有限，而其低頻天線部13為了要達到低頻電磁波訊 號的四分之一波長的要件，必須向上延伸足夠的長度， 但這在逐漸輕薄短小化的無線通訊裝置中儼然已行不 通’因為面積原本就相當有限的電路板上是無法容許天 線任意延伸而佔用太大的面積，且頻帶寬度更受單極天 10線本身特性影響，而無法太寬，這也是本發明所需要克 服的問題。 此外’目前亦已製造出來之一種雙頻或多頻天線晶 片’其做法是將該天線做在一晶片上並封裝成一顆IC ’然後再將該天線1C設置在一例如 PCMCIA卡或 15 CardBus卡之電路板上，但是此種晶片形態的天線到目 前為止，其針對IEEE802.1 1 a標準設計的天線可以支援 的頻率範圍也僅在5.15GHz〜5.35GHz，收發頻寬顯然太 窄，而且因為天線晶片的製程較平面天線複雜，導致製 造成本高，而且設計上亦較無彈性。所以，目前市面上 20 雖已有各種支援不同標準或頻帶的雙頻或多頻天線產 品，但不論其收發訊號的頻寬、佔用面積或製造成本上 都仍存在有待改善之處，尤其是當天線應用在 IEEE802.11a頻帶上時，頻寬不足的問題更需要加以克 服。因此，為了滿足無線通訊網路使用者的需求以及設 25 計上的種種考量，一種設置於電路板上之可支援 本紙張尺度適用中國國家標準（CNS) A4規格（210χ 297公釐） 第5頁 557608 A7 B7 五、發明說明（3 ) IEEE802.11a與可支挺lEEE802.11b標準，並且對 IEEE802.11a標準能提供大於igHz之高頻訊號收發頻 寬且符合IEEE802.11b之使用頻寬，並且可涵蓋日本頻 帶之一種平面雙頻天線正在被積極開發中。 5【發明概要】 因此，本發明之目的即在提供一種供直接印刷在一 電路板上之平面雙頻天線，以達到製程簡單、成本低、 具有設計彈性並可增加收發訊號頻寬之目的。 因此，本發明之平面雙頻天線係設置於一電路板上 10 ，用以收發一第一電磁波訊號（IEEE802.1 la頻帶）及一第 二電磁波訊號（IEEE 802 .lib頻帶），該平面雙頻天線包括 一饋入路徑、一第一天線部、一第二天線部及一接地部 。該饋入路徑係用以饋入第一電磁波訊號及第二電磁波 訊號之南頻電磁波訊號，第一天線部包括一第一平面及 15 —第二平面，該第一平面具有一漸縮段，且該漸縮段之 最窄寬度處與該饋入路徑之一端相連接，並且其中該第 一平面係為一天線之共振腔，用以收發部份第一電磁波 訊號，該第二平面具有一頭部與一頸部，該頸部遠離該 頭部之一端與該第一平面連接，並且該頸部之寬度係朝 2 0 向該第一平面漸減，其亦用以收發部分之該第一電磁波 訊號。由於第一平面與第二平面的共振頻率皆共振在鄰 近的頻帶上，故可將訊號的頻寬擴增，並達到1GHz以 上，以符合IEEE802.il a的頻帶應用。該第二天線部與 該第一平面連接，用以收發該第二電磁波訊號，並與該 25 第二平面相隔一間距，使相互間之影響降低。該接地部 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公爱 1 - 第6頁 557608 A7557608 A7 --------- _B7 V. Description of Invention (2) " " Therefore, even though the dual-band antenna described above receives signals in two frequency bands, it is clear that its transmittable frequency range cannot support I-EEE802 · lla and b at the same time, especially in the IEEE 802 lu part and its high-frequency antenna section 12 Restricted by the shape design, the receiving frequency and bandwidth are both limited. The low-frequency antenna section 13 must extend upwards to a sufficient length to achieve the quarter-wavelength requirements of low-frequency electromagnetic signals, but this is gradually becoming thinner. Shortened wireless communication devices simply don't work. 'Because the area of the circuit board, which is already quite limited, cannot allow the antenna to extend arbitrarily and occupy too much area, and the frequency band width is more affected by the characteristics of the monopole antenna 10 line, and It cannot be too wide, which is also a problem to be overcome by the present invention. In addition, 'a dual-frequency or multi-frequency antenna chip has also been manufactured', the method is to make the antenna on a chip and package it into an IC, and then set the antenna 1C in a PCMCIA card or a 15 CardBus card, for example. Circuit board, but so far, this antenna in the form of a chip can only support the frequency range of 5.15GHz ~ 5.35GHz for the antenna designed for the IEEE802.1 1 a standard. The transmit and receive bandwidth is obviously too narrow, and because The manufacturing process of the antenna chip is more complicated than that of a planar antenna, resulting in high manufacturing costs and inelastic design. Therefore, although there are various dual-band or multi-band antenna products on the market that support different standards or frequency bands, there is still room for improvement regardless of the bandwidth, occupied area, or manufacturing cost of the transmitting and receiving signals, especially when When the antenna is applied in the IEEE802.11a band, the problem of insufficient bandwidth needs to be overcome. Therefore, in order to meet the needs of wireless communication network users and various considerations on the design, a paper set on the circuit board that supports this paper size applies the Chinese National Standard (CNS) A4 specification (210 × 297 mm) Page 5 557608 A7 B7 V. Description of the invention (3) IEEE802.11a and lEEE802.11b standards, and can provide high-frequency signal transmission and reception bandwidth greater than igHz to the IEEE802.11a standard and comply with the IEEE802.11b use bandwidth, and can A planar dual-band antenna covering the Japanese frequency band is being actively developed. 5 [Summary of the Invention] Therefore, the object of the present invention is to provide a planar dual-band antenna for direct printing on a circuit board, so as to achieve the purpose of simple manufacturing process, low cost, design flexibility, and increasing the bandwidth of transmitting and receiving signals. Therefore, the planar dual-frequency antenna of the present invention is provided on a circuit board 10 for receiving and transmitting a first electromagnetic wave signal (IEEE802.1la frequency band) and a second electromagnetic wave signal (IEEE 802.lib frequency band). The frequency antenna includes a feeding path, a first antenna portion, a second antenna portion, and a ground portion. The feeding path is used to feed the south frequency electromagnetic wave signal of the first electromagnetic wave signal and the second electromagnetic wave signal. The first antenna portion includes a first plane and a 15-second plane, and the first plane has a tapered section. And the narrowest width of the tapered section is connected to one end of the feeding path, and the first plane is a resonant cavity of an antenna for transmitting and receiving part of the first electromagnetic wave signal, and the second plane has A head and a neck, one end of the neck away from the head is connected to the first plane, and the width of the neck is gradually reduced toward 20 to the first plane, and it is also used to send and receive part of the first plane. An electromagnetic wave signal. Since the resonance frequencies of the first plane and the second plane both resonate in adjacent frequency bands, the bandwidth of the signal can be amplified and reach 1 GHz or more to meet the band application of IEEE802.il a. The second antenna portion is connected to the first plane for transmitting and receiving the second electromagnetic wave signal, and is spaced apart from the 25 second plane by a distance to reduce mutual influence. The grounding section This paper size applies to China National Standard (CNS) A4 (210x 297 Public Love 1-Page 6 557608 A7
五、發明說明（4 設在該饋人路徑之兩侧，做為接地之用途。藉此達到端 減面積及增加收發電磁波訊號之頻寬等目的。 、 【圖式之簡單說明】 本發明之其他技術内容、特徵及優點，在以下配合 5參考圖式之較佳實施例的詳細說明中，將可清楚的呈現 ，在圖式中： 第一圖是習知一種雙頻天線； 第二圖是本發明平面雙頻天線之一較佳實施例； 第二圖是本實施例的實際計算結果；及 10 第四圖是本實施例印刷在一電路板上之態樣。 【發明之詳細說明】 參照第二圖所示，其為本發明平面雙頻天線的一較 佳實施例，該平面雙頻天線2是設置在一電路板3上， 用以接收一第一電磁波訊號及一第二電磁波訊號，其中 15第一電磁波訊號是根據IEEE 802.1 1 a標準產生，其中心 工作頻率為5.5GHZ’訊號頻率範圍從5.15〜5.825GHz ，其涵蓋適用於曰本的頻帶範圍（4.9〜5·825 GHz)，第二 電磁波訊號是根據IEEE 802 _ lib標準產生，其中心工作 頻率為2.45GHz，訊號頻率範圍從2.412〜2.4835GHz， 20因此平面雙頻天線2實質上是一支援IEEE 8 02· 11a及b 標準之雙頻天線。如第二圖所示，平面雙頻天線2包括 一饋入路徑2 0、一第一天線部2 1、一第二天線部2 4及 一接地部2 5。 饋入路徑20具有兩端，在此稱其中之一為遠端201 25 ，另一為近端2 02，且饋入路徑20主要提供高頻電磁 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） ' - 第7頁 557608 A7 B7 五 、發明說明（ 5 ) 波 訊 號 饋入 之路徑 ，且其實 際上是一 50歐姆傳輸線。 一 第一 天線部 21，包括一第一平面22及一第二平 面 23 〇 第一 平面22具有一 前端221與一後端222，並 於 趨 近 該前 端221 處形成一 •漸縮段2 2 3，該漸縮段2 2 3 5 具 有 一 對稱 軸2 24 ，根據對 稱軸2 2 4，由前端2 2 1相對 兩 側 朝 後端 222方 向斜向延 伸兩對稱之線段2 2 5，並由 該 二 線 段2 2 5末端 垂直延伸 二連接後端2 2 2之平行線段 226 使第- -平面 22構成 一漏斗狀之平面，且該後端 222 實 際上 是第一 平面22 的一側邊，故在兩線段225 10 間 構 成 一錐 形面， 當然兩線 段2 2 5亦可為對稱曲線而在 其 間 構 成一 拋物面 ，且前端 221即為漸縮段223之最窄 寬 度 處 ，並 與饋入 路徑21 之遠端2 0 1相連接，以供該 第 一 及 第二 電磁波 訊號饋入 •。且如第三圖所示，第一平 面 22 藉由 其形狀 及面積設計（稱之類錐形天線或錐形 15 天 線 之 變形 )，實f 祭上是一 天線共振腔共振在5. 85GHZ 附 近 j 且由 於第一 平面22 之漸縮段2 2 3的兩線段2 2 5 為 對 稱 ，第 一及第 二電磁波 訊號可以沿著線段2 2 5對稱 均 勻 地 進到 第一平 面22中 0 該 第二 平面23亦具有 一前端與一後端，並在後端 20 與 前 端 分別 形成一 頭部2 3 1 與一頸部232，該頸部232 遠 離 該 頭部 231之 一端邊233與第一平面22之後端222 連 接 ， 用以 收發第 一電磁波訊號。且頸部 232之端邊 233 與 第一 平面2 2的後端 222之間具有一與端邊233 平 行 之 切槽 230， 該切槽23 0之開口朝右（當然也可以 25 朝 左 )« 。頭部2 3 1 為一長方 形區域，而且其一側邊235 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） 第8頁 557608 五、發明說明（7 在本實施例中，么 24的總長度達到第減/面積的佔用並使第二天線部 成共振的條件，第二:電::广四分之-波長以符合達 其具有二相對長；線;:24設計成-馬蹄形平面， 5短邊243與第4二242及二短邊243，，其中 .241 9干面22之端邊222連接，而且沿兩相 對長遺2 41、2 4 2形λ、+如上 形成稷數相間隔且開口方向相反之切 槽（s 1 1 1) 2 4 5，且右太香#义丨& ^ 在本實施例+，該等切槽245集中在 Λ 近'一短邊 243 Λ o/1/ι # 一 44處，而將第二天線部分割成一第 一 一連接面247及一第二延伸臂248等三 10部分’其中第-延伸臂246之一端(即短邊Μ”與第— 平面2 2連接並朝德雜势 T/ 朝疋離第一千面22方向延伸而與連接面 15 20 247連接’並在第—延伸臂…與第一平面22間具有 一切槽（開口朝左或朝右皆可），且第二延伸臂248藉連 接面247與第一延伸臂246等距間隔地連接。如此藉 由第一延伸f 246與第二延伸冑24?之延伸，將使得第 二天線部24的總長度增加並達到第二電磁波訊號的四 分之一波長的長度，而能夠收發第二電磁波訊號。而且 在第二天線部24上保留一較完整之連接面247可提供 第二電磁波訊號較大的輻射或感應面積。此外，本發明 更將第二天線部24之短邊244的寬度設計成大於短邊 243的寬度，可使第二電磁波訊號更均勻的輻射以增加 接收角度範圍。 接地部2 5設在饋入路徑2 0的兩側，做為饋入路徑 20的接地，使饋入路徑20以傳輸線形態傳輸電磁波訊 125號。另一方面，接地部25要儘量靠近第一天線部21的 本紙張尺度適用中國國家標準（CNS) A4規格（21〇χ 297公楚） 第10頁 557608 A7 ____B7_ 五、發明說明（8 ) 第一平面22，以提供一接地面給單極（mon〇p〇ie)天線 形態之第一天線部21及第二天線部2 4，使產生鏡射 (image或mirror)效應。而且第二天線部24之第二延 伸臂248的自由端（即短邊244)趨近於接地部25並與 5接地部2 5相隔一間距，該間距最好是饋入路徑2 〇之寬 度的1.5〜2倍’以防止搞合（C0Upiing)效應的產生。 接著參照第四圖所示，是本實施例平面雙頻天線2 佈局（layout)在一 CARD-BUS卡之電路板4上的態樣， 在電路板4的一侧兩端分別佈局有一平面雙頻天線2， 10且兩天線2擺設方向呈一夾角，以增加接收及傳送能力 〇 由上述可知，本發明在接收第一電磁波訊號方向， 應用具有收發頻寬較寬且面積較小等特點之錐形天線 ，以兩個具有不同工作頻率範圍但頻寬相近之錐形天線 15串接方式形成第一天線部21，使第一天線部2 1收發第 一電磁波訊號之頻寬可以拉寬，而涵蓋到日本頻帶以及 製造上的誤差，並且減少面積的佔用。而第二天線部 24則對習知長形單極天線進一步改良，將第二天線部 24设汁成馬蹄形狀而減少佔用面櫝，並在靠近兩短邊 20 243、244處藉由該等切槽245形成一第一延伸臂246 及第二延伸臂248，在第二天線部24長度有限的情況 下，增加第一天線部24的路徑長度，使達到相當於第 二電磁波訊號的四分之一波長，而得以收發第二電磁波 訊號，並且藉由將短邊244寬度設計成大於短邊243之 25設計，使第二天線部24輻射場更均勻及接收的角度範 ~本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公«) ' -- 第11頁 557608 A7 B7 五、發明說明（9 ) 圍可以更廣。 惟以上所述者，僅為本發明之較佳實施例而已，當 不能以此限定本發明實施之範圍，即大凡依本發明申請 專利範圍及發明說明書内容所作之簡單的等效變化與 5 修飾，皆應仍屬本發明專利涵蓋之範圍内。 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） 第12頁 557608 A7 B7 五、發明說明（10 ) 【元件標號對照】 2 平面雙頻天線 20 饋入路徑 21 第一天線部 22 第一平面 23 第二平面 24 第二天線部 25 接地部 201 遠端 202 近端 221 前端 222 後端 223 漸縮段 224 對稱軸 225 線段 226 平行線段 231 頭部 232 頸部 233 端邊 230 切槽 234 右側邊 235 側邊 241 、242長邊 243 、244短邊 245 切槽 246 第一延伸臂 247 連接面 248第二延伸臂 本紙張尺度適用中國國家標準（CNS) A4規格（210x 297公釐） 第13頁V. Description of the invention (4 It is set on both sides of the feeding path for grounding purposes. This can achieve the purpose of reducing the area and increasing the bandwidth of the electromagnetic wave signal. [Simplified description of the diagram] Other technical contents, features and advantages will be clearly presented in the following detailed description of the preferred embodiment with reference to 5 drawings. In the drawings: The first picture is a conventional dual-frequency antenna; the second picture It is one of the preferred embodiments of the planar dual-band antenna of the present invention; the second figure is the actual calculation result of this embodiment; and the fourth figure is the state of this embodiment printed on a circuit board. [Detailed description of the invention As shown in the second figure, it is a preferred embodiment of the planar dual-band antenna of the present invention. The planar dual-band antenna 2 is disposed on a circuit board 3 for receiving a first electromagnetic wave signal and a second Electromagnetic wave signals, of which 15 the first electromagnetic wave signal is generated according to the IEEE 802.1 1 a standard, and its central operating frequency is 5.5GHZ. The signal frequency range is from 5.15 to 5.825 GHz, which covers the frequency band range applicable to Japanese (4.9 to 5.825 GHz) The second electromagnetic wave signal is generated according to the IEEE 802_lib standard, and its center operating frequency is 2.45GHz, and the signal frequency range is from 2.412 to 2.4835GHz. 20 Therefore, the planar dual-band antenna 2 is essentially a support for IEEE 8 02 · 11a and b Standard dual-band antenna. As shown in the second figure, the planar dual-band antenna 2 includes a feeding path 20, a first antenna section 21, a second antenna section 24, and a ground section 25. The feed path 20 has two ends, one of which is called the far end 201 25 and the other is the near end 02 02. The feed path 20 mainly provides high-frequency electromagnetics. The paper size is applicable to China National Standard (CNS) A4 specifications. (210x 297 mm) '-Page 7 557608 A7 B7 V. Description of the invention (5) The path of the wave signal feed, and it is actually a 50 ohm transmission line. A first antenna section 21 includes a first The plane 22 and a second plane 23. The first plane 22 has a front end 221 and a rear end 222, and a tapered section 2 2 3 is formed near the front end 221. The tapered section 2 2 3 5 has A symmetry axis 2 24, according to the symmetry axis 2 2 4, the front end 2 2 1 phase The two symmetrical line segments 2 2 5 extend obliquely toward the rear end 222 on both sides, and two parallel line segments 226 connecting the rear end 2 2 2 are vertically extended from the end of the two line segment 2 2 5 so that the first plane 22 constitutes a funnel. And the rear end 222 is actually a side of the first plane 22, so a tapered surface is formed between the two line segments 225 10, of course, the two line segments 2 2 5 can also be a symmetrical curve and form a Parabolic surface, and the front end 221 is the narrowest width of the tapered section 223, and is connected to the far end 201 of the feeding path 21 for feeding the first and second electromagnetic wave signals. And as shown in the third figure, the first plane 22 is designed by its shape and area (referred to as the conical antenna or the deformation of the conical 15 antenna), and the real f sacrifices is an antenna resonant cavity resonance at 5. 85GHZ near j Since the two line segments 2 2 5 of the tapered segment 2 2 3 of the first plane 22 are symmetrical, the first and second electromagnetic wave signals can enter the first plane 22 symmetrically and uniformly along the line segment 2 2 5 The two planes 23 also have a front end and a rear end, and a head 2 3 1 and a neck 232 are formed at the rear end 20 and the front end, respectively. The neck 232 is far from one end 233 of the head 231 and the first plane. The rear end 222 is connected to receive and transmit the first electromagnetic wave signal. A cut groove 230 parallel to the end edge 233 is provided between the end edge 233 of the neck 232 and the rear end 222 of the first plane 22, and the opening of the cut groove 23 0 faces right (of course, 25 can also be left). . The head 2 3 1 is a rectangular area, and one side of the paper is 235. The paper size is in accordance with Chinese National Standard (CNS) A4 (210x 297 mm). Page 8 557608 5. Description of the invention (7 In this embodiment, The total length of the 24 reaches the condition of the first subtraction / area occupancy and makes the second antenna part resonate. The second: electricity :: one-quarter of a wide-wavelength to comply with its relatively long; line; 24 design Into a horseshoe-shaped plane, 5 short sides 243 are connected to the 4th two 242 and the second short side 243, of which .241 9 is connected to the end edge 222 of the dry surface 22, and along the two relatively long sides 2 41, 2 4 2 shape λ, + The grooves (s 1 1 1) 2 4 5 spaced apart from each other and opposite in the opening direction are formed as above, and the right Taixiang # 义 丨 & ^ In this embodiment +, the grooves 245 are concentrated at Λ near 'a Short side 243 Λ o / 1 / ι # one and 44 points, and the second antenna section is divided into three 10 parts such as a first-to-one connecting surface 247 and a second extension arm 248, one of the ends of the-extension arm 246 ( That is, the short side M ”is connected to the first plane 2 2 and extends toward the German miscellaneous potential T / towards the direction away from the first thousandth plane 22 and is connected to the connecting plane 15 20 247. There are all grooves between one plane 22 (the opening can be left or right), and the second extension arm 248 is connected to the first extension arm 246 at equal intervals by the connecting surface 247. Thus, the first extension f 246 and the first extension arm The extension of the two extensions? 24? Will increase the total length of the second antenna portion 24 and reach a length of a quarter wavelength of the second electromagnetic wave signal, and be able to send and receive the second electromagnetic wave signal. A relatively complete connection surface 247 on 24 can provide a larger radiation or induction area for the second electromagnetic wave signal. In addition, the present invention further designs the width of the short side 244 of the second antenna portion 24 to be greater than the width of the short side 243 The second electromagnetic wave signal can be more uniformly radiated to increase the receiving angle range. The grounding part 25 is provided on both sides of the feeding path 20 as the ground of the feeding path 20, so that the feeding path 20 is transmitted as a transmission line. Electromagnetic wave signal No. 125. On the other hand, the paper size of the grounding portion 25 as close as possible to the first antenna portion 21 applies the Chinese National Standard (CNS) A4 specification (21〇χ297297) Page 10 557608 A7 ____B7_ V. Invention description (8) A plane 22 to provide a ground plane for the first antenna portion 21 and the second antenna portion 24 of the monopole antenna form, so that a mirror effect is generated. The free end (ie, the short side 244) of the second extension arm 248 of the two antenna portions 24 approaches the ground portion 25 and is spaced apart from the 5 ground portion 25 by a distance which is preferably the width of the feeding path 2 0 1.5 to 2 times' to prevent the occurrence of the coupling effect. Next, referring to the fourth figure, the layout of the planar dual-band antenna 2 in this embodiment on a circuit board 4 of a CARD-BUS card is shown. A planar dual-frequency antenna 2 is arranged on one end of the circuit board 4 respectively. Frequency antennas 2, 10 and two antennas 2 are placed at an angle to increase the receiving and transmitting capabilities. As can be seen from the above, the present invention has the characteristics of wider transmitting and receiving bandwidth and smaller area when receiving the first electromagnetic wave signal. Conical antenna. The first antenna section 21 is formed by connecting two conical antennas 15 with different operating frequency ranges but similar bandwidths in series, so that the first antenna section 21 can transmit and receive the first electromagnetic wave signal with a wide bandwidth. Wide, while covering the Japanese band and manufacturing errors, and reducing the occupation of area. The second antenna section 24 further improves the conventional long monopole antenna. The second antenna section 24 is formed into a horseshoe shape to reduce the occupied area, and is near the two short sides 20 243 and 244. The cutouts 245 form a first extension arm 246 and a second extension arm 248. When the length of the second antenna portion 24 is limited, the path length of the first antenna portion 24 is increased to reach the second electromagnetic wave. The quarter-wavelength of the signal can send and receive the second electromagnetic wave signal, and by designing the width of the short side 244 to be larger than the 25 of the short side 243, the second antenna portion 24 has a more uniform radiation field and a receiving angle range. ~ This paper size applies the Chinese National Standard (CNS) A4 specification (210x 297 male «) '-Page 11 557608 A7 B7 5. The invention description (9) can be wider. However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and 5 modifications made according to the scope of the patent application and the content of the invention specification of the present invention , All should still fall within the scope of the invention patent. This paper size applies to China National Standard (CNS) A4 (210x 297 mm) Page 12 557608 A7 B7 V. Description of the invention (10) [Comparison of component numbers] 2 Planar dual-frequency antenna 20 Feed path 21 First antenna Section 22 first plane 23 second plane 24 second antenna section 25 grounding section 201 distal end 202 proximal end 221 front end 222 rear end 223 tapered section 224 axis of symmetry 225 line segment 226 parallel line segment 231 head 232 neck 233 end edge 230 slot 234 right side 235 side 241, 242 long side 243, 244 short side 245 slot 246 first extension arm 247 connection surface 248 second extension arm Mm) Page 13