200820489 九、發明說明： 【發明所屬之技術領域】 本發明係為一種雙頻天線，胜 ^ ^ ^ , 特別疋具有一縮小化尺寸 之内臧式雙頻天線，適合内藏於盔 、“、、線通訊產品中。 . 【先前技術】 者無線通訊的逢勃發展，益合 • 您如展無線網路的應用越來越廣 泛，而天線的性能優劣，影響荖益 考"、、線通訊產品的通訊品質 #，因此天線的性能表現便成為無線通訊產品整體評價的重 ^關鍵。目前習㈣無線通訊產品的雙頻天線如台灣發明 專，弟1237,754號“雙頻天線，，及台灣專利公告號第泌抑 就雙頻天線”，所揭示的一種利用筆記型電腦液晶榮幕 所内建的接地面，在其接地面上設計雙頻天線的例子皆具 有一較大的尺寸（一般長度大於3〇mm)。若將上述的^ 、本内藏於通產品中’需要較大的配置空間以達成良好的 鲁1·生此表現，這對於需求多個不同天線操作於不同頻帶的無 線通訊產品而言，目前習知的天線設計有其應用上之限制 。為解決此一問題，我們提出一種創新的天線設計，該天 線具有一縮小化尺寸並適合内藏於通訊產品中，且可涵蓋 目剷無線區域網路（WLAN，Wireless Local Area Network ) 2.4 GHz (2.4-2.484 GHz)及 5 GHz (5.15-5.35, 5.725-5.875 GHz)頻帶 所須之頻寬需求。 200820489 k【發明内容】 如上所述，本發明之目的在於提供一種縮小化 雙衫線。本發明包括：一接地面，形狀大致為一矩形，、 :有：上方邊緣，而在該接地面之上方邊緣附近具200820489 IX. Description of the invention: [Technical field of the invention] The present invention is a dual-band antenna, which is a multi-frequency antenna with a reduced size and is suitable for being embedded in a helmet, ",, and line. In the communication products. [Previous technology] The development of wireless communication, Yihe • Your application of wireless network is more and more widely used, and the performance of the antenna is good and bad, affecting the benefits of the test ",, line communication products The communication quality #, therefore the performance of the antenna has become the key to the overall evaluation of wireless communication products. Currently, the dual-frequency antennas of the wireless communication products such as Taiwan Invention, Brother 1237, 754 "Double-band antenna, and Taiwan" The patent publication number is the same as the dual-frequency antenna. The disclosed example uses a ground plane built into the LCD screen of a notebook computer. The example of designing a dual-frequency antenna on the ground plane has a larger size (generally The length is greater than 3〇mm). If the above ^, this is hidden in the product, 'requires a large configuration space to achieve a good performance, this requires multiple different antennas. For wireless communication products with different frequency bands, the conventional antenna design has its application limitations. To solve this problem, we propose an innovative antenna design with a reduced size and suitable for inclusion in The communication products can cover the bandwidth requirements of the 2.4 GHz (2.4-2.484 GHz) and 5 GHz (5.15-5.35, 5.725-5.875 GHz) bands of the Wireless Local Area Network (WLAN). 200820489 k [Description of the Invention] As described above, it is an object of the present invention to provide a reduced double shirt line. The present invention includes: a ground plane having a shape substantially a rectangle, having: an upper edge, and at the ground plane Near the top edge
二點路點’·一第一輻射金屬臂，形狀大致為-倒L 二;端及一末端，該起始端為天線之饋入點， 於，亥接地面之接地點附近，而該末端大致 面之上方邊緣，並朝向遠離該接地面之 丁=地 :第一 於產生該天線之第二 …第二輪射金屬臂’形狀大致為一倒L形、 於：第，射金屬臂之長度’具有一起始端及一：端二 起始為電氣連接至該接地面之短路點，而該 二 該接地面之上方邊緣，並朝向唁一 ^而、行 向延伸，且該第二輻射全屬臂;二屬臂之末端方 耵至屬#千仃该接地面之部分蛊哕筮 一輻射金屬臂平行該接地面之部^弟 小於3麵，使得㈣—料m有特疋距離（一般 -)，…：： 弟—輻射金屬臂具有良好的耦 所環繞，該第二輕射金屬臂用於彦-輪射金屬臂 )摔作，帶1 1 天線之第-（較低 :刼作頻π，及一饋入同軸傳輸線，包含 連接至該第-輕射金屬臂之起始端； ：線’ 連接至該接地面之該接地點。 體， 第二幸畐射金屬臂均由金屬片製作而^弟一輪射金屬臂與該 之第二二:作;:::輪射金屬臂之長度接近該天線 "乂冋）知作頻帶中心頻率之1/4波長，而該第二 200820489 輻射金屬臂之長度接近該天線之第一（較低）操作頻帶中 波長。因此’藉由分別調整該第-輕射金屬 —弟—㈣金屬臂之錢，可以得到本發明天線之雙 .頻操作，且本發明天線具有天線縮小化的優點，適合内藏 於热線通訊產品中，達成雙頻操作之通訊功能。 【實施方式】Two-point waypoint '·a first radiating metal arm, the shape is roughly - inverted L two; end and one end, the starting end is the feeding point of the antenna, near the grounding point of the grounding surface, and the end is substantially The upper edge of the face, and facing away from the ground plane, the ground is first: the second of the second metal arm that generates the antenna is substantially inverted L-shaped, and the length of the metal arm is 'Having a starting end and a: the second end is a short circuit point electrically connected to the grounding surface, and the upper edge of the two grounding surfaces extends toward the side, and the second radiation is all The arm of the second arm belongs to the end of the genus. The part of the grounding surface is a part of the grounding surface. The radiating metal arm is parallel to the part of the grounding surface. The brother is less than 3 faces, so that the (4) material m has a special distance (generally - ),...:: Brother - the radiating metal arm has a good coupling around, the second light metal arm is used for the Yan-Shifting Metal Arm), with the 1st antenna - (lower: 刼π, and a feed into the coaxial transmission line, including the start end connected to the first-light metal arm; : line ' Connected to the grounding point of the grounding surface. The body, the second lucky metal arm is made of metal sheet and the second arm of the metal arm and the second two: made;::: the length of the metal arm is close to The antenna "乂冋 is known as the 1/4 wavelength of the center frequency of the band, and the length of the second 200820489 radiating metal arm is close to the wavelength in the first (lower) operating band of the antenna. Therefore, by adjusting the money of the first-light-light metal-di-(four) metal arm separately, the double-frequency operation of the antenna of the present invention can be obtained, and the antenna of the present invention has the advantages of antenna reduction, and is suitable for being embedded in hot-wire communication. In the product, the communication function of dual-frequency operation is achieved. [Embodiment]
參考第1圖，本發明之雙頻天線一實施例i，包含： -接地面12 ,形狀大致為一矩形’具有一上方邊緣⑵， 而在該接地面之上方邊緣121附近具有—接地點122與一 紐路點123 ; -第-輻射金屬臂13’形狀大致為一倒L形 具有.起始端131及一末端132，該起始端131為天線 之饋入點131 ’位於該接地面之接地點122附近’而該末 該接地面之短路點123方向延伸 端132大致以平行該接地面之上方邊緣i2i ，並朝向遠離 該第一輻射金屬臂13用 於產生该天線之第二（較高）操作頻帶22 ; 一第二輻射金 屬# 14，形狀大致為一倒L形，其長度大於該第一輻射金 屬臂13之長度，具有一起始端141及一末端142，該起始 端141電氣連接至該接地面之短路點123 ，而該末端142 大致平行該接地面之上方邊緣121 ，並朝向該第一輻射金 屬臂之末端132方向延伸，且該第二輻射金屬臂14平行該 接地面12之部分與該第一輻射金屬臂13平行該接地面12之 邛伤具有一特定距離d，·並使得該第一輻射金屬臂13大致 為該第二輻射金屬臂14所環繞，該第二輻射金屬臂14用於 200820489 、產生該天線之第一（較低）操作頻帶21;及—饋入同軸傳 輸線15’包含：一中心導線151 ’連接至該第—輻射金屬 臂之起始端131 ;及一外層接地導體152，連接至該接地 面之，地點122。在本實施例1中，該第一輻射金屬臂13 與該第二輻射金屬臂14均由金屬片製作而成，且本發明天 •線具有天線縮小化的優點，適合内藏於無線通訊產品中， •達成雙頻操作之通訊功能。 =2圖為本發明天線一實施例1的返回損失量測結果 ，在貫施例1中，為考慮筆記型電腦液晶螢幕内建之接地 面環境，我們選擇接地面12之長度約為26〇mm、寬度約為 200 ，天線之長度約為2〇 mm (平行接地面上緣之長度 )，其中該第一輻射金屬臂13之長度約為13mm、寬度約 為2mm，该第二金屬臂14之長度約為、寬度約為2 mm 且该第二輻射金屬臂14平行該接地面12之部分與該 第一輻射金屬臂13平行該接地面12之部份之特定距離 _ mm由所得實驗結果，在返回損失小於i〇dB的定義 下"亥操作頻寬可涵蓋目前無線區域網路（wlAN ) 2.4 GHz (2·4_2·484 GHz)及 5 GHz (5.15-5.35, 5·725_5·875 GHz)頻帶所 須之頻寬需求。 者"第3圖為本發明之第一其他實施例3，本實施例3與 例1之不同在於該第一輻射金屬臂33與該第二輻射金 5 ^ 34為一平面式結構，且該第一輻射金屬臂33、該第二 :射金屬臂34與該接地面12均在同一平面上。第4 弟二其他實施例4，在本實施例4中，該第一輻射 200820489 金屬臂33與該第二輻射金屬臂44由印刷或蝕刻技術形成於 一微波基板46上，且該第二輻射金屬臂之末端442折彎朝 向该接地面之上方邊緣121方向延伸。第一及第二其他實 鈿例均可以獲得如本發明之一實施例（第1圖結構）相似 的操作特性。 以上說明中所述之實施例僅為說明本發明之原理及功 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圖為本發明天線之第一其他實施例結構圖。 第4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】 1 :本發明天線一實施例 12 :接地面或筆記型電腦液晶螢幕（LCD)之支撐金屬 背板 121 :接地面之一上方邊緣 122 :接地點 U3 :短路點 13 :第一輻射金屬臂 200820489 、 131 :第一輻射金屬臂之起始端或天線饋入點 132 :第一輻射金屬臂之末端 14 :第二輻射金屬臂 141 :第二輻射金屬臂之起始端 142 :第二輻射金屬臂之末端 . 15 :饋入同軸傳輸線 151 ··饋入同轴傳輸線之中心導線 152 :饋入同軸傳輸線之外層接地導體 ❿ d : —特定距離 21 :第一操作頻帶 22 :第二操作頻帶 3 :本發明天線之第一其他實施例 33 :第一輻射金屬臂 ^ 34 :第二輻射金屬臂 4 :本發明天線之第二其他實施例 44 :第二輻射金屬臂 442 :第二輻射金屬臂之末端 46 :微波基板 11Referring to Fig. 1, an embodiment i of the dual-frequency antenna of the present invention comprises: - a ground plane 12 having a shape substantially a rectangle 'having an upper edge (2) and having a grounding point 122 near the upper edge 121 of the ground plane And a new way point 123; - the first radiating metal arm 13' is substantially in the shape of an inverted L. The starting end 131 and an end 132, the starting end 131 is the feeding point 131 of the antenna is located at the grounding surface Near the location 122, and the short-circuit point 123 extending end 132 of the ground plane is substantially parallel to the upper edge i2i of the ground plane, and facing away from the first radiating metal arm 13 for generating the antenna second (higher An operating band 22; a second radiating metal #14, having a substantially inverted L shape having a length greater than a length of the first radiating metal arm 13, having a starting end 141 and an end 142, the starting end 141 being electrically connected to a short-circuit point 123 of the ground plane, the end 142 is substantially parallel to the upper edge 121 of the ground plane, and extends toward the end 132 of the first radiating metal arm, and the second radiating metal arm 14 is parallel to the ground plane 12 Partially The first radiating metal arm 13 has a specific distance d parallel to the grounding surface 12, and the first radiating metal arm 13 is substantially surrounded by the second radiating metal arm 14. The second radiating metal arm 14 is used. The first (lower) operating frequency band 21 of the antenna is generated in 200820489; and the feeding coaxial transmission line 15' includes: a center conductor 151 'connected to the starting end 131 of the first radiating metal arm; and an outer grounding conductor 152, connected to the ground plane, location 122. In the first embodiment, the first radiating metal arm 13 and the second radiating metal arm 14 are both made of a metal sheet, and the antenna of the present invention has the advantages of antenna reduction, and is suitable for being embedded in a wireless communication product. Medium, • Achieving communication functions for dual-frequency operation. The =2 figure is the return loss measurement result of the antenna of the first embodiment of the present invention. In the first embodiment, in order to consider the ground plane environment built in the liquid crystal screen of the notebook computer, we select the length of the ground plane 12 to be about 26 inches. Mm, width is about 200, the length of the antenna is about 2 〇mm (the length of the parallel ground plane edge), wherein the first radiant metal arm 13 has a length of about 13 mm and a width of about 2 mm, and the second metal arm 14 The length of the beam is approximately 2 mm and the portion of the second radiating metal arm 14 parallel to the ground plane 12 is parallel to the first radiating metal arm 13 by a specific distance _ mm of the portion of the ground plane 12 from the experimental results obtained Under the definition that the return loss is less than i〇dB, the operating bandwidth can cover the current wireless local area network (wlAN) 2.4 GHz (2·4_2·484 GHz) and 5 GHz (5.15-5.35, 5·725_5·875). The bandwidth requirement for the GHz band. The third embodiment is the first other embodiment 3 of the present invention, and the third embodiment differs from the first embodiment in that the first radiating metal arm 33 and the second radiating gold 5 ^ 34 are in a planar structure, and The first radiating metal arm 33, the second metal arm 34 and the ground plane 12 are all on the same plane. 4th second embodiment 4, in the fourth embodiment, the first radiation 200820489 metal arm 33 and the second radiation metal arm 44 are formed on a microwave substrate 46 by printing or etching techniques, and the second radiation The end 442 of the metal arm is bent toward the upper edge 121 of the ground plane. Both the first and second other embodiments can obtain operational characteristics similar to those of an embodiment of the present invention (structure of Fig. 1). The embodiments described in the above description are merely illustrative of the principles and functions of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention is set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural view showing an embodiment of an antenna according to the present invention. Figure 2 is a graph showing the return loss measurement of an embodiment of the antenna of the present invention. Figure 3 is a structural view of a first other embodiment of the antenna of the present invention. Fig. 4 is a structural view showing a second embodiment of the antenna of the present invention. [Main component symbol description] 1 : Antenna of the present invention is an embodiment 12: a ground plane or a support computer liquid crystal display (LCD) supporting metal back plate 121: one of the ground planes upper edge 122: grounding point U3: short circuit point 13: The first radiating metal arm 200820489, 131: the starting end of the first radiating metal arm or the antenna feeding point 132: the end 14 of the first radiating metal arm: the second radiating metal arm 141: the starting end 142 of the second radiating metal arm: End of the second radiating metal arm. 15: Feeding the coaxial transmission line 151 · Feeding the center conductor 152 of the coaxial transmission line: Feeding the grounding conductor of the coaxial transmission line ❿ d : - Specific distance 21 : First operating band 22 : Two operating band 3: a first other embodiment 33 of the antenna of the invention: a first radiating metal arm 34: a second radiating metal arm 4: a second other embodiment 44 of the antenna of the invention: a second radiating metal arm 442: End of the second radiating metal arm 46: microwave substrate 11