59^5041 五、發明說明（1) [發明所屬之技術領域] 本發明係有關於一種近似自我互補天線，更特別是有 -關於一種用於無線區域網路（WLAN)系統之近似自我互補天 線0 [先前技術]59 ^ 5041 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to an approximate self-complementary antenna, and more particularly to an approximate self-complementary antenna for a wireless local area network (WLAN) system. 0 [Prior art]
隨著各式無線通訊技術的成熟化，對於通訊頻寬的需 求量也因而逐漸增加，因此體積小且頻寬大的天線成為最 基本的設計目標。然而目前所習用之印刷式單極天線設 計’在實際應用上，通常無法滿足寬頻的需求，如美國專 利弟6，2 9 5，0 2 9號：小型化微帶天線（μ i n i a t u r e microstrip antenna)，其揭示一種應用在無線區域網路 之小型、行動式無線數據通訊產品之印刷式單極天線，其 包含一微波基板、一矩形螺旋狀輻射金屬線及一接地面， 該矩形螺旋狀輻射金屬線與該接地面印製於該微波基板之 同一表面，該天線只侷限在單頻帶無線區域網路，如2. 4 GHz頻帶（2400-2484 MHz)操作，其頻寬約只有3· 5%，利用 同樣的天線設計技術應用在無線區域網路5. 2 / $. 8 g Η zWith the maturity of various wireless communication technologies, the demand for communication bandwidth has gradually increased, so antennas with small size and large bandwidth have become the most basic design goals. However, the currently used printed monopole antenna design is generally unable to meet the needs of broadband in practical applications, such as US Patent No. 6, 29.5, 0 2 9: μ iniature microstrip antenna It discloses a printed monopole antenna for a small, mobile wireless data communication product applied to a wireless local area network. The printed monopole antenna includes a microwave substrate, a rectangular spiral radiating metal wire, and a ground plane. The rectangular spiral radiating metal The wire and the ground plane are printed on the same surface of the microwave substrate. The antenna is limited to a single-band wireless local area network, such as 2.4 GHz band (2400-2484 MHz) operation, and its bandwidth is only about 3.5% , Using the same antenna design technology in wireless LAN 5. 2 / $. 8 g Η z
( 5 1 50 - 5350/5725-5875 MHz)頻帶操作時，由於受到該天 線操作頻寬上的限制，將無法包含整個5· 2/5 8 GHz雙頻 帶頻寬。 · X s 為解決上述之問題，本發明提供一種近似自我互補天 線的創新設計，其尺寸與上述印刷式單極天線接近，不過 操作頻寬可達到2 5 %以上或大約1 · 5 G Η z，可以包含5 2(5 1 50-5350 / 5725-5875 MHz) band operation, due to the limitation of the operating bandwidth of this antenna, the entire 5 · 2/5 8 GHz dual band bandwidth cannot be included. · X s In order to solve the above problems, the present invention provides an innovative design that approximates a self-complementary antenna. Its size is close to the above-mentioned printed monopole antenna, but the operating bandwidth can reach more than 25% or about 1.5 G Η z Can contain 5 2
第7頁 595041Page 7 595041
GHz與5·8 GHz之無線區域網路頻帶範圍。 -[内容] 如上所述，本發明之目的在於提供一種近似自我互補 天線，由於該天線具有寬頻之特性，因此適合同時操作在 兩個不同頻帶之無線區域網路（WLAN)系統。 本發明之另一目的係提供一種近似自我互補天線，其 中該天線係重量輕且體積小，可以容易地安置於一無線區 域網路產品中，操作為一隱藏式天線（c〇ncealed 〇r internal antenna)。 為達上述之目的，本發明提供一種近似自我互補天線 的創新設計，該天線結構與其互補結構幾近相同，因此具 有/、 般自我互補天線一樣的寬頻特性。該天線包含一第 二輻射金屬片及一第二輻射金屬片，該第一輻射金屬片之 幵7狀大體上與該第二輻射金屬片形成互補，且該二個輻射 金f 1以印刷或餘刻技術形成於一介質基板上’並相對於 該^質基板中心線對稱地配置於該介質基板的二邊上，形 =該天線之兩臂，且該第一輻射金屬片及第二輻射金屬乂 ^各包含一饋入點，連接至一同軸傳輸線之中心導線或外 地導體。該第一輻射金屬片及該第二輻射金屬片之長 $均接近於該天線操作模態中心頻率的1 /4波長，亦即該 線之全長接近該天線操作模態中心頻率的丨/ 2波長。 [貫施方式]GHz and 5 · 8 GHz wireless LAN bands. -[Content] As described above, the object of the present invention is to provide an approximately self-complementary antenna. Since the antenna has a wideband characteristic, it is suitable for simultaneously operating a wireless local area network (WLAN) system in two different frequency bands. Another object of the present invention is to provide an approximately self-complementary antenna, wherein the antenna is light in weight and small in size, and can be easily installed in a wireless local area network product, and operates as a hidden antenna (c0ncealed internal internal). antenna). To achieve the above object, the present invention provides an innovative design of an approximately self-complementary antenna. The antenna structure is almost the same as its complementary structure, and therefore has the same broadband characteristics as a general self-complementary antenna. The antenna includes a second radiating metal sheet and a second radiating metal sheet. The 幵 7 shape of the first radiating metal sheet is substantially complementary to the second radiating metal sheet, and the two radiating gold f 1 are printed or The remaining technology is formed on a dielectric substrate and is symmetrically disposed on two sides of the dielectric substrate with respect to the center line of the substrate, and the shape = the two arms of the antenna, and the first radiation metal sheet and the second radiation The metal wires each include a feed point connected to a center wire or a ground conductor of a coaxial transmission line. The lengths of the first radiating metal sheet and the second radiating metal sheet are both close to the 1/4 wavelength of the center frequency of the operating mode of the antenna, that is, the full length of the line is close to the center frequency of the operating mode of the antenna. wavelength. [Implementation method]
5分 5041 五、發明說明（3) 第1圖為本發明之近似自我互補天線之一實施例；該 天線包含··一同軸傳輸線1 2，該同軸傳輸線具有一中心導 -線1 3和一外層接地導體1 4 ;以及一第一輻射金屬片1 〇〗和 一第二輻射金屬片102，該第一及第二輻射金屬片分別具 有一饋入點103及一饋入點104。該第一輻射金屬片1〇；[之 形狀大體上與該第二輪射金屬片102形成互補，且該第一 及第二輕射金屬片係以印刷或餘刻技術形成於一介質基板 11上，並相對於該介質基板11之中心線對稱地配置於該介 貝基板11的一邊上’形成該天線之兩臂。該第一輻射金屬 片1 01及該第二輻射金屬片1 02之長度均接近於該天線操作 模態中心頻率的1 /4波長，且該第一輻射金屬片饋入點丨 與該第二輻射金屬片饋入點1 〇 4係以電氣連接至該同軸傳 輸線中心導線13與該同軸傳輸線外層接地導體14。該同轴 傳輸線1 2為一特性阻抗5 〇歐姆之同軸傳輸線，用以將該天 線之微波信號傳輸至後級電路。 第2圖為本發明天線一實施例之返回損失實驗量測結 果，其中該量測結果係在以下條件下獲得的：該介質基板 11具有一介電係數4.4、0·4 mm之厚度、21 _之長度及6 ΓΛ匕Η由量測結果可知該天線具有大約U -(約 4.6至6.1(；112)之頻寬，可以包含無線區域網路5 =:535"Hz)及 5.8GHz(5725_5875 MHz)之兩個頻帶 於5.2第===線；=:之天線増益測量結果； 鴻""中5玄天線增盈可以達到約4.0 dBi，5 cents 5041 5. Description of the invention (3) Figure 1 is an embodiment of the approximate self-complementary antenna of the present invention; the antenna includes ... a coaxial transmission line 12 which has a central guide-line 13 and a The outer ground conductor 14; and a first radiating metal sheet 100 and a second radiating metal sheet 102. The first and second radiating metal sheets have a feeding point 103 and a feeding point 104, respectively. The shape of the first radiating metal sheet 10; [is substantially complementary to the shape of the second shot metal sheet 102, and the first and second light shot metal sheets are formed on a dielectric substrate 11 by printing or engraving technology. The two arms of the antenna are formed on one side of the dielectric substrate 11 symmetrically with respect to the center line of the dielectric substrate 11. The lengths of the first radiating metal sheet 101 and the second radiating metal sheet 102 are close to the 1/4 wavelength of the center frequency of the operating mode of the antenna, and the first radiating metal sheet feed point 丨 and the second The radiating metal sheet feeding point 104 is electrically connected to the coaxial transmission line center conductor 13 and the coaxial transmission line outer layer ground conductor 14. The coaxial transmission line 12 is a coaxial transmission line with a characteristic impedance of 50 ohms, and is used to transmit the microwave signal of the antenna to the subsequent circuit. FIG. 2 is an experimental measurement result of return loss of an antenna according to an embodiment of the present invention, wherein the measurement result is obtained under the following conditions: The dielectric substrate 11 has a dielectric constant of 4.4, a thickness of 0.4 mm, and a thickness of 21 The length of _ and 6 ΓΛ Η Η From the measurement results, we know that the antenna has a bandwidth of about U-(about 4.6 to 6.1 (; 112), which can include the wireless local area network 5 =: 535 " Hz) and 5.8 GHz (5725_5875 MHz) of the two frequency bands at the 5.2th === line; =: antenna gain measurement results; Hung " " Medium 5 Xuan antenna gain can reach about 4.0 dBi,
第9頁 5^5041 、發明說明（4) 而於5· 8 GHz操作頻帶中，該 〆大綠增盈則可以读5丨丨幼9 β dBi，因此，該實施例於操作 、、、· "。 M咿肀具有不錯之天線增 应 ° 第4圖為本發明天線之第_ ^ ^ f 屬片角；其= 該第-輻射金屬片大一體二 矩形金屬片並具有一4开/ 屬片大體上有- 得該第二輻射金屬片之形狀大體‘吏 成互補。 不平田射金屬片形 =發明說明中所述之實施例僅為說 而非限制本發明…，習於此技術之 明：：發明之精神對上述實施例進行修改及變化。本_ 之權利範圍應如後述之申請專利範圍所列。 ^Page 9 5 ^ 5041, description of the invention (4) In the 5 · 8 GHz operating band, the large green gain can be read 5 丨 丨 9 β dBi, so this embodiment is useful in operation ,,,, · ". M 咿 肀 has a good antenna increase. Figure 4 shows the first _ ^ ^ f of the antenna of the present invention; it is = the -radiation metal sheet is integrated into two rectangular metal sheets and has a 4 open / metal sheet. There is-the shape of the second radiation metal sheet is generally complementary. The uneven field shot metal sheet shape = The embodiment described in the description of the invention is only for the purpose of illustration, but not for the purpose of limiting the present invention, and is accustomed to this technology: The spirit of the invention modifies and changes the above embodiment. The scope of the right of this _ shall be as listed in the scope of patent application mentioned later. ^
第10頁 595041 圖式簡單說明 [圖式簡單說明] 第1圖為本發明之近似自我互補天線之一實施例結構圖。 第2圖為本發明天線一實施例之返回損失測量結果。 第3圖為本發明天線一實施例之天線增益測量結果。 第4圖為本發明天線輻射金屬片之其他實施例結構圖。 [元件符號說明] I 本發明之近似自我互補天線一實施例 101 第一輻射金屬片 102 第二輻射金屬片 103 第一輻射金屬片饋入點 104 第二輻射金屬片饋入點 II 介質基板 12 同軸傳輸線 13 同軸傳輸線中心導線 14 同軸傳輸線外層接地導體 41、42、43近似自我互補天線之輻射金屬片其它實施例 411、 421、431第一輻射金屬片 412、 422、432第二輻射金屬片 413、 423、433第一輻射金屬片饋入點Page 10 595041 Brief description of the drawings [Simplified description of the drawings] Fig. 1 is a structural diagram of an embodiment of the approximate self-complementary antenna of the present invention. FIG. 2 is a measurement result of return loss of an embodiment of the antenna of the present invention. FIG. 3 is an antenna gain measurement result of an embodiment of the antenna of the present invention. FIG. 4 is a structural diagram of another embodiment of the antenna radiation metal sheet of the present invention. [Explanation of component symbols] I An embodiment of the approximate self-complementary antenna of the present invention 101 First radiation metal sheet 102 Second radiation metal sheet 103 First radiation metal sheet feed point 104 Second radiation metal sheet feed point II Dielectric substrate 12 Coaxial transmission line 13 Coaxial transmission line center conductor 14 Coaxial transmission line outer ground conductor 41, 42, 43 Radial metal sheet of approximately self-complementary antenna Other embodiments 411, 421, 431 First radiation metal sheet 412, 422, 432 Second radiation metal sheet 413 , 423, 433 First radiation metal sheet feed point
595041 圖式簡單說明 414、424、434 第二輻射金屬片饋入點595041 Brief description of the diagram 414, 424, 434 Feed point of the second radiating metal sheet