200952256 九、發明說明： -【發明所屬之技術領域】 ; 本發明係關於一種環形天線，尤其是有關於一種適合 ‘内建於行動通訊裝置之縮小化多頻環形天線。 【先前技術】 隨著無線通訊的快速發展，舉凡無線通訊產品，為迎 合消費市場需求’在外型上皆以輕、薄、短、小為潮流趨 ❹，：在此同時，無線通訊產品又必須能提供多樣化服務， 這也就意味著，會有越來越多的系統模組以及元件被裝置 到產品内部的有限空間中，因此放置天線的空間也相對會 受到壓縮，傳統的單極以及平板天線，由於需要倚靠大片 金屬才能共振出需求頻寬，因此針對現今小型且多頻化的 天線需求，我們發現環形天線是為更佳選擇。如美國專利 公告號第US 7,265,726 B2號“多頻天線(Multi七娜__，，， 其揭示種具有多金屬支臂之環形天線，並使用於行動通 •訊系統 GSM (890 〜960 MHz)及 DCS (1710 〜1880 MHZ)/PCS (1850 〜1990 MHZ)/UMTS (1920 〜2170 MHz)多頻操作之内藏式 手機天線的例子，可達成多頻操作。但我們又發現，雖然 環形天線可以使用細的金屬線形成共振，且仍可保有需求 的頻寬，但在上面所提之先例中，其使用的是習知環形天 線的二分之一波長模態及全波長模態，其中二分之一波長 模態提供GSM頻帶操作，這使得天線尺寸不易縮小。另一 方面，如美國專利公開號US20070268191 A1號之設計“無線 5 200952256 通訊裝置及天線（Antenna and wireless communication devieesy，， '適當的設計匹配電路，也可達成多頻段的操作需求。在本 ；發明中我們提出一種創新的縮小化多頻環形天線設計，在 •本天線設計中使用印刷式匹配電路作為天線之饋入，取代 一般常見之晶片元件匹配電路，此印刷式匹配電路由一印 刷式電容及一印刷式電感所組成，在900 MHz附近頻率範 圍k供電谷性，得以激發具有良好匹配之輻射金屬環的四 ❹^之一波長共振模態，作為第一共振模態，並提供低頻頻 帶之操作；同時，印刷式匹配電路在18〇〇 MHZ附近頻率範 圍提供電感性，使輻射金屬環之二分之一波長以及全波長 共模態也有良好的匹配，此二模態合成一寬頻操作頻寬， 並提供高頻頻帶之操作。本項設計因激發輻射金屬環之四 分之一波長共振模態提供低頻頻帶操作，因此其尺寸約為 習知環形天線之一半，而整體天線可提供 GSM/DCS/PCS/UMTS四頻操作，符合實際手機系統之應用需 求。 【發明内容】 ^上所述，本發明之目的在於提供—種手機天線的創 新《又汁，不僅可以達成適用於gsm/dcs/pcs/umts頻帶的手 機天線設計，同時本發明天線尺寸僅有一般操作於相同頻 帶之手機天線的+，且其結構簡單、操作機制明確、 作容易，並具有節省手機内部空間之優點。 本發明天線包含：—介質基板、一接地面及-輕射部 6 200952256 ’該接地面位於該介質基板上，並具-接地點；而該輻射 卩則·支撐介質、一耦合金屬片、一連接金屬線及 :-輻射金屬環’·上述之該搞合金屬片及該連接金屬線，皆 .為該支樓介質所支撺，連接金屬線之一端連接至該輕合金 屬片，另—端則連接至一訊號源；輻射金屬環，亦為 U所支樓，且圍繞該連接金屬線以及該輕合金屬片， 又該輻射金屬環之長度大致為天線最低操作頻率之四分之 ❹一波長’並具有-第-末端區間、-第二末端區間以及一 短路點’其中該第一末端區間與該搞合金屬片之間，具有 一小於3晒之距離，而該短路點則位於該第二末端區間， 且該短路點電氣連接至該接地面之接地點。上述之該介質 基板為行動通訊裝置之系統電路板，而該接地面 通，裝置之系統接地面；該輻射部可為平面印刷式或經過 二次以上之f折而成—立體結構；而該支撐介質之材料則 為玻纖基板、塑膠材料、陶竟材料或空氣；又該輕合金屬 ❹片之形狀為一直線形狀、L形狀或τ形狀。 在本發明所提出的技術中，使用印刷式匹配電路作為 天線之饋入，此印刷式匹配電路由—印刷式電容（轉合金 屬片）及-印刷式電感（連接金屬、線）所組成，使用二一 印刷式匹配電路’得以激發具有良好匹配之輻射金屬環的 四分之一波長共振模態，以提供低頻頻帶之操作；同 ㈣金屬環之二分之-波長以及全波長共模態也有良好的 匹配，而此二模態合成的寬頻操作頻寬，可提供高 7 200952256 之操作。低頻頻帶（四分之-波長共振模態）提供一大約 16〇_2(890〜1050MHz)的操作頻寬，可涵蓋GSM頻帶操作200952256 IX. Description of the invention: - [Technical field to which the invention pertains] The present invention relates to a loop antenna, and more particularly to a reduced-width multi-frequency loop antenna suitable for use in a mobile communication device. [Prior Art] With the rapid development of wireless communication, wireless communication products, in order to meet the needs of the consumer market, are trending on the appearance of light, thin, short and small. At the same time, wireless communication products must It can provide a variety of services, which means that more and more system modules and components are installed in the limited space inside the product, so the space for placing the antenna is relatively compressed, the traditional monopole and Flat panel antennas, because they need to rely on large pieces of metal to resonate with the required bandwidth, we have found that loop antennas are a better choice for today's small and multi-frequency antenna requirements. For example, U.S. Patent No. 7,265,726 B2 "Multi-Frequency Antenna (Multi-Seven __,, which discloses a loop antenna having a multi-metal arm and enabling it to be used in the mobile communication system GSM (890 to 960 MHz)) And DCS (1710 ~ 1880 MHZ) / PCS (1850 ~ 1990 MHZ) / UMTS (1920 ~ 2170 MHz) multi-frequency operation of the built-in mobile phone antenna example, can achieve multi-frequency operation. But we also found that although the loop antenna Resonance can be formed using a thin metal wire, and the required bandwidth can still be maintained, but in the above-mentioned precedent, a half-wave mode and a full-wavelength mode of a conventional loop antenna are used, wherein The one-half wavelength mode provides GSM band operation, which makes the antenna size difficult to shrink. On the other hand, the design of "Wireless 5 200952256 communication device and antenna (Antenna and wireless communication devieesy,, ' is designed as US Patent Publication No. US20070268191 A1). Appropriate design matching circuit can also achieve multi-band operation requirements. In this invention, we propose an innovative reduced-multi-frequency loop antenna design in this antenna design. The printed matching circuit is used as the feeding of the antenna, which replaces the common chip component matching circuit. The printed matching circuit is composed of a printed capacitor and a printed inductor, and supplies a valley in a frequency range of around 900 MHz. Exciting a four-wavelength resonant mode with a well-matched radiating metal ring as the first resonant mode and providing operation in the low frequency band; meanwhile, the printed matching circuit provides inductivity in the frequency range around 18 〇〇 MHZ The two-wavelength of the radiating metal ring and the full-wavelength common mode are also well matched. The two modes synthesize a wide-band operating bandwidth and provide operation in a high-frequency band. This design is due to the excitation of the metal ring. The quarter-wavelength resonant mode provides low-frequency band operation, so its size is about one-half of the conventional loop antenna, and the whole antenna can provide GSM/DCS/PCS/UMTS quad-band operation, which is in line with the application requirements of actual mobile phone systems. Contents] As described above, the object of the present invention is to provide an innovation of a mobile phone antenna, which is not only applicable to gsm/d. The design of the mobile phone antenna of the cs/pcs/umts band, and the antenna size of the present invention only has the + of the mobile phone antenna generally operating in the same frequency band, and has the advantages of simple structure, clear operation mechanism, easy operation, and the advantage of saving the internal space of the mobile phone. The antenna of the present invention comprises: a dielectric substrate, a ground plane and a light-emitting portion 6 200952256 'the ground plane is located on the dielectric substrate and has a grounding point; and the radiation · · supporting medium, a coupling metal piece, and a Connecting metal wire and: - radiant metal ring '· The above-mentioned metal piece and the connecting metal wire are all supported by the supporting medium, one end of the connecting metal wire is connected to the light metal piece, and the other is The end is connected to a signal source; the radiating metal ring is also a branch of U, and surrounds the connecting metal wire and the light metal piece, and the length of the radiating metal ring is substantially four quarters of the minimum operating frequency of the antenna. a wavelength 'and has a - end-end interval, - a second end interval, and a short-circuit point', wherein the first end portion and the mating metal piece have a distance of less than 3, and the short circuit The point is located in the second end interval, and the short circuit point is electrically connected to the ground point of the ground plane. The dielectric substrate is a system circuit board of the mobile communication device, and the grounding surface is connected to the system grounding surface of the device; the radiating portion may be a flat printing type or a f-fold formed by two or more times; The material of the supporting medium is a glass fiber substrate, a plastic material, a ceramic material or air; and the shape of the light metal enamel is a straight line shape, an L shape or a τ shape. In the technique proposed by the present invention, a printed matching circuit is used as the feeding of the antenna, and the printed matching circuit is composed of a printed capacitor (transferred metal piece) and a printed inductor (connecting metal, wire). Using a two-one printed matching circuit' to excite a quarter-wave resonant mode with a well-matched radiating metal ring to provide operation in the low-frequency band; the same as the (four) metal ring, the two-wavelength and full-wavelength common mode A good match, and the wide-band operation bandwidth of this two-mode synthesis provides high operation of 200952256. The low frequency band (quadruple-wavelength resonance mode) provides an operating bandwidth of approximately 16 〇 2 (890 to 1050 MHz), covering GSM band operation
:需求，且本天線在此需求頻帶内之返回損失皆有高於6dB -的表現；高頻頻帶（二分之-波長及全波長共振模態合成 )則可形成一約600MHz(1650〜2250MHZ)之操作頻寬，並 涵蓋DCS/PCS/UMTS頻帶的操作需求，且在此所需頻帶範圍 1710〜2170MHz的返回損失值亦皆有高於6犯的表現，符 ❿合應用需求。同時本天線設計非但結構簡單、操作機制明 確，其尺寸相較於一般相同操作頻帶之手機天線大幅減小 ’亦即節省手機内部放置天線之空間’故具有產業應用之 價值。 茲配合下列圖式、實施例之詳細說明及申請專利範圍 ，將上述及本發明之其他目的與優點詳述於後。 【實施方式】 ❹ 第1圖為本發明天線一實施例！結構圖。實施例i包 含：一介質基板10、一接地面丨丨及一輻射部12;該接地面 11位於該介質基板10上，並具一接地點111 ;而該輻射部 12則包含：一支撐介質121、一耦合金屬片122、一連接 金屬線123及一輻射金屬環124 ;上述之該耦合金屬片 122及該連接金屬線123，皆為該支撐介質121所支撐， 該連接金屬線123之一端連接至該耦合金屬片122，另一 端則連接至一訊號源13 ;輻射金屬環124，亦為該支撐介 質121所支撐，且圍繞該耦合金屬片122以及該連接金屬 8 200952256 =二=金屬環124之長度大致為天線最低操作 77 波長，並具有一第一末端區間125 、一第 :二末端區間126以及一短路點127，其中該第一末端: demand, and the return loss of the antenna in this demand band has a performance higher than 6dB -; the high frequency band (half-wavelength and full-wavelength resonance mode synthesis) can form a 600MHz (1650~2250MHZ) The operating bandwidth is wide and covers the operational requirements of the DCS/PCS/UMTS band, and the return loss values of the required band range of 1710 to 2170 MHz are also higher than the performance of the six offenses. At the same time, the antenna design is not only simple in structure, but also has a clear operating mechanism. The size of the antenna is significantly smaller than that of the mobile phone antenna in the same operating band, which means that the space for placing the antenna inside the mobile phone is saved, so it has the value of industrial application. The above and other objects and advantages of the present invention will be described in detail below with reference to the accompanying drawings. [Embodiment] FIG. 1 is an embodiment of an antenna according to the present invention! Structure diagram. The embodiment i includes: a dielectric substrate 10, a ground plane 丨丨 and a radiating portion 12; the ground plane 11 is located on the dielectric substrate 10 and has a grounding point 111; and the radiating portion 12 comprises: a supporting medium 121, a coupling metal piece 122, a connecting metal wire 123 and a radiating metal ring 124; the coupling metal piece 122 and the connecting metal wire 123 are supported by the supporting medium 121, and one end of the connecting metal wire 123 Connected to the coupling metal piece 122, the other end is connected to a signal source 13; the radiating metal ring 124 is also supported by the supporting medium 121, and surrounds the coupling metal piece 122 and the connecting metal 8 200952256 = two = metal ring The length of the 124 is approximately the minimum operating wavelength of the antenna, and has a first end interval 125, a second end interval 126, and a short circuit 127, wherein the first end
125與該耦合金屬片122 B '^间具有一小於3mm之特定距 離，而該短路點m則位於該第二末端區間126 路點⑺電氣連接至該接地面^接地點⑴。上述$ ^基=為行動通訊裝置之系統電路板而該接地面^ ©々’’灯L Λ裝置之系統接地面；該輻射部12為平面印刷 屬片SI介質121之材料則為玻纖基板，又該麵合金 屬片122之形狀為一 L形狀。 太為第1圖之實施例1的返回損失實驗量測結果 。本實驗選擇下列尺寸進行量測：介質基板料果 二之:R4玻纖基板’接地面η之尺寸為40xl0(W，.並 於”質基板11之表面；輻射部12之支料質⑵使 厚度為0.8 mm之:FR4玻^ _ 〇別為35腿及1〇mm 盈且支撐介質121的長寬分 及輻射金屬環m皆平面二^片122、連接金屬線123 其中宽度支撑介質121之表面， 形狀的耦合金屬片122其長度 咖，而連接金屬線！23 A甯声〇9 ^此 馬 為麵，且其一端連接的細線’其長度約 連接至一訊號和合金屬片122 ’另-端則 ⑵所支撑二繞:=環124 ’亦為該支撐介質 ⑵，金屬環：以：金屬線 線最低共振頻率之四分長度約為* 刀〈疚長，並具有一第一末端區間 9 200952256 125 、一第二末端區間〗26以及一短路點127 ，其中該第 -一末端區間125 ，大致平行該耦合金屬片122，彼此間具 •有1mm之距離，並形成一串聯電容效應，而該短路點127 則位於該第二末端區間126附近，且該短路點127電氣連 接至該接地面11之接地點U1 。有別於習知技術之環形天 線採用輻射金屬環之二分之一波長模態作為第一個共振模 態，以提供GSM頻帶之頻寬需求，本項設計採用之輻射金 ❹屬環124的長度為85 mm，僅約900 MHz之四分之一波長 ，故低頻頻帶21為輻射金屬環124之四分之一波長共振模 態，而高頻頻帶22則為輻射金屬環124之二分之一波長及 全波長共振模態所合成。在尚未使用耦合金屬片122及連 接金屬線123所組成的印刷式匹配電路的狀況下（訊號源 13直接饋入至輻射金屬環124)，此時天線的共振機制與傳 統環形天線相同，僅可激發環形天線的二分之一波長共振 模態作為第一共振模態’而無法激發環形天線的四分之一 ❹波長共振模態。而當使用了印刷式匹配電路中的耦合金屬 片122 ’可補償輻射金屬環124的四分之一波長共振模態 的高電感性虛部阻抗，使此模態可成功被激發，並具有良 好阻抗匹配；再配合印刷式匹配電路中的連接金屬線123 ’用以補償高頻頻帶22二個共振模態之虛部阻抗，使高頻 頻帶22亦能形成一具有良好阻抗匹配之寬頻操作。本發明 天線使用輻射金屬環124之四分之一波長、二分之一波長 及全波長模態’配合選取耦合金屬片122尺寸以及連接金 屬線123之長度，共可達成三個具有良好匹配之共振模態 200952256 。低頻頻帶（四分之一波長共振模態）提供一大約i6〇 MHz(890〜1050MHz)的操作頻寬，可涵蓋GSM頻帶操作需 求，且本天線在此需求頻帶内之返回損失皆有高於6犯的 表現；高頻頻帶（二分之一波長及全波長共振模態合成） 則可形成一約600MHZ(1650〜225〇MHz)之操作頻寬，並涵 蓋DCS/PCS/UMTS㈣的操作需求，且在此所需頻帶範圍 1710〜2170 MHz的返回損失值亦皆有高於6肋的表現，符 合應用需求。 第3及第4目分別為本發明天線第一其他實施例3及 第二其他實施例4結構圖。實施例3及4與實施例i的整 體結構大致相同’惟實施例3之柄合金屬片322形狀為τ 形形狀’而實施例4之耗合金屬片422形狀為一直線形狀 ;又實施例4中之輻射金屬環424經過二次以上之彎折而 成一立體結構，並由一大致為立方體形狀之支撐介質42ι 所支撐；且實施例4中之接地面u配合其輻射部12之整體 开7狀及位置而為矩形形狀截去一截角。然此等實施例 仍皆可達成與實施例1相同之功效。 綜合上述的說明’ |發明天線的結構簡$，操作機制 明確’製作f本低’同時可縮減手機天線尺寸，因此本發 明天線甚具尚度產業應用價值，足以符合發明之範疇。 准以上所述者，僅為本發明之較佳實施例而已，當 不月b以此限疋本發明實施之範圍。即大凡依本發明申請專 11 200952256 利範圍所作之均等變化與修飾，皆應仍屬本發明專利涵蓋 之範圍内。There is a specific distance between the 125 and the coupling metal piece 122B'^ which is less than 3mm, and the short circuit point m is located at the second end interval 126. The waypoint (7) is electrically connected to the grounding surface ^ grounding point (1). The above-mentioned $^ base= is the system board of the mobile communication device, and the ground plane is the system ground plane of the lamp L Λ device; the radiant portion 12 is the flat printing unit SI medium 121, and the material is the glass substrate Further, the surface of the metal piece 122 is in the shape of an L. It is too the experimental result of the return loss of the first embodiment of Fig. 1. The experiment selects the following dimensions for measurement: the dielectric substrate material II: R4 glass fiber substrate 'the grounding surface η size is 40x10 (W,. and on the surface of the substrate 11; the radiation portion 12 is supported by the material (2) The thickness is 0.8 mm: FR4 glass ^ _ 〇 is 35 legs and 1 〇 mm and the length and width of the supporting medium 121 and the radiating metal ring m are both flat 122, connecting metal wire 123, wherein the width supporting medium 121 The surface, the shape of the coupling metal piece 122 has a length of coffee, and the connecting metal wire! 23 A Ningsheng 〇 9 ^ This horse is a face, and the thin wire connected at one end thereof is connected to a signal and a metal piece 122 ' The end (2) is supported by two windings: = ring 124' is also the supporting medium (2), the metal ring is: the minimum length of the metal wire is four minutes long and the length is about * knife < 疚 long, and has a first end interval 9 200952256 125, a second end interval 26 and a short circuit point 127, wherein the first end portion 125 is substantially parallel to the coupling metal piece 122, has a distance of 1 mm from each other, and forms a series capacitance effect, and The short circuit point 127 is located in the second end interval 126 The short-circuit point 127 is electrically connected to the grounding point U1 of the grounding surface 11. The loop antenna different from the prior art uses a half-wavelength mode of the radiating metal ring as the first resonant mode to provide The bandwidth requirement of the GSM band, the radiating element 124 124 of this design uses a length of 85 mm, which is only about a quarter of a wavelength of 900 MHz, so the low frequency band 21 is a quarter wavelength of the radiating metal ring 124. The resonant mode, and the high frequency band 22 is synthesized by the one-half wavelength and the full-wavelength resonant mode of the radiating metal ring 124. The printed matching circuit composed of the coupling metal piece 122 and the connecting metal wire 123 is not used. In the situation (the signal source 13 is directly fed to the radiating metal ring 124), the resonance mechanism of the antenna is the same as that of the conventional loop antenna, and only the half-wavelength resonant mode of the loop antenna can be excited as the first resonant mode' The quarter-turn wavelength resonant mode of the loop antenna cannot be excited. When the coupling metal piece 122' in the printed matching circuit is used, the high inductance of the quarter-wave resonance mode of the radiating metal ring 124 can be compensated. The imaginary impedance makes the modality successfully excited and has good impedance matching; and the connecting metal wire 123' in the printed matching circuit is used to compensate the imaginary impedance of the two resonant modes of the high frequency band 22, so that The high frequency band 22 can also form a broadband operation with good impedance matching. The antenna of the present invention uses the quarter-wavelength, one-half wavelength and full-wavelength mode of the radiating metal ring 124 to match the size of the coupling metal piece 122 and By connecting the length of the metal line 123, a total of three well-matched resonant modes 200952256 can be achieved. The low-frequency band (quarter-wavelength resonant mode) provides an operating bandwidth of approximately i6〇MHz (890~1050MHz). Covering the GSM band operation requirements, and the return loss of this antenna in this demand band is higher than 6; the high frequency band (half-wavelength and full-wavelength resonance mode synthesis) can form a 600MHZ ( Operating bandwidth of 1650~225〇MHz), and covers the operation requirements of DCS/PCS/UMTS(4), and the return loss value of the required band range of 1710~2170 MHz is also higher than that of 6 ribs. Application requirements. The third and fourth objects are structural views of the first other embodiment 3 and the second other embodiment 4 of the antenna of the present invention, respectively. The overall structures of the embodiments 3 and 4 are substantially the same as those of the embodiment i. However, the shank metal piece 322 of the embodiment 3 has a shape of a τ shape and the shape of the consuming metal piece 422 of the embodiment 4 has a straight line shape. The radiating metal ring 424 is bent into a three-dimensional structure by two or more times, and is supported by a substantially cubic-shaped supporting medium 42ι; and the grounding surface u in Embodiment 4 is combined with the entire opening portion of the radiating portion 12 The shape and position are truncated by a truncated angle. However, the same effects as in Embodiment 1 can still be achieved by these embodiments. According to the above description, the structure of the invention antenna is simple, and the operation mechanism is clear, and the size of the mobile phone antenna can be reduced. Therefore, the antenna of the present invention has a good industrial application value and is sufficient for the scope of the invention. The above is only the preferred embodiment of the present invention, and is not limited to the scope of the present invention. That is, the equivalent changes and modifications made by the applicant in accordance with the scope of the invention are still within the scope of the invention.
12 200952256 【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圖為本發明天線第一其他實施例結構圖。 第4圖為本發明天線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 3 :本發明天線第一其他實施例 4 :本發明天線第二其他實施例 10 :介質基板 1卜 41 :接地面 111 :接地點 12 、42 :輻射部 121 、421 :支撐介質 φ 122 、322、422 :耦合金屬 123 :連接金屬線 124 、424 :輻射金屬環 125 :第一末端區間 126 :第二末端區間 127 :短路點 13 ： 訊號源 21 ： 低頻頻帶 22 ： 高頻頻帶 1312 200952256 [Simplified description of the drawings] Fig. 1 is a structural diagram of 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 block diagram showing the first 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 - Embodiment 3: Antenna of the present invention First Embodiment 4: Antenna of the present invention Second Embodiment 10: Dielectric substrate 1 : 41: Ground plane 111 : Ground point 12 42: radiation portions 121, 421: support medium φ 122, 322, 422: coupling metal 123: connection metal wires 124, 424: radiation metal ring 125: first end interval 126: second end interval 127: short circuit point 13: signal Source 21: Low frequency band 22: High frequency band 13