1287319 玖、發明說明： 【發明所屬之技術領域】 本發明係涉及一種倒F型天線(inverted-F antenna)，特別是應 用於無線通訊產品上之天線。 【先前技術】 隨著近年來無線通訊的快速發展，在產品的各項需求上也逐 漸’除了達成電氣特性的規格外，在外觀上及實用便利性上 也逐漸朝向多元化，因此小型化的内藏式天線成為近來無線產品 ，主2 ’、而為了達成尺寸的縮小化，且在天線特性上仍必須維持 夕頻帶或寬頻的特性，通常會使得内藏式天線的設計趨於複雜 化且不易作規格上的調整。因此如何在有限的環境及空間内， ΐϊΐ效的天線參數降低餅的複雜度且達到產品所需的規格及 洋性度’成為内藏式天線設計的重要指標。 目韵應用於行動式通訊設備如：手機、個人數位助理(pda) ίίίΐΐ藏ΐ天線’通常採用倒F型的天線設計，習知的倒F f 31美國專利第6,727,854號”倒F型平板天線，·(參考第 祕行料狀喊歧線，敍線主要輻 饋入點16及短路點17 發可大致分為三個電 15，棚該不同路徑激發料_共振頻率，形 天線，i上H圖）’其亦揭不—種應用於行動手機之内藏式 可大要輪射金屬片由饋人點25及短路點26出發，亦 成雙頻ϋ 電流路徑2G及24,分別激發兩個共振模態來達 利用十中，第-個設計為了能夠增加頻寬， 月:Γ之…構，使其結構較為複雜，進而造成效率損耜以 猶絲單 ΐ: 決上述兩問題，游手，產品多頻操作之需求。為解 '靖我們在本發明中提出一種倒F型天線的創新設 1287319 ::片之起始端及末 r該末端互相靠近' s天線 加爾以達成系統戶 之創新設計。貞而求疋極具有產業應用價值 【發明内容】 -ί：：ίί.Κ 片、-饋入點及一短J點片々、-弟二子輻射金屬 疒短路金屬片，‘第一; 鳊及末端，該起始端位於該輕 :‘ /、 σ 而該第：射二㈡ 屬片之起“ 點位於第一子輕射金 天線系統訊號源；、— 金屬片，近且為該第—子輻射金屬片所包圍；-短路 射金屬接接，另一端則連接至該第二子輕 載該介ϊ基底 貝基底贱支魏射金則，接地面承 本發明利用第-子轄射金屬片及第二子輕射金屬片形成之第 1287319 里及第二路徑，產生多頻共振模態，提高天線操作頻寬，使 :付δ各通訊標準頻帶之系統需求。 【實施方式】 一釦如第3圖所示為本發明之倒F型天線之一實施例3 ’其包含·· 加金，片3〇、一介質基底35及一接地面34，該輻射金屬片 ^ ^ =一第一子輻射金屬片301、一饋入點302、一第二子輻射金 fi 3及短路點，並配置一饋入金屬片36連接至該饋入 ”、、02，以及一短路金屬片37連接至短路點304。 其中一第一子輻射金屬片3〇1具有一起始端及一末端，該起 开ίίϊ該輻射金屬片之—邊緣，而該末端則以旋繞方式延伸， ^ 一路徑，且該末端靠近該起始端並為開路，該末端與該 間具有—間隙；第二子輕射金屬片咖亦具有一起始端 f鈿，其起始端連接於該第一子輻射金屬片3〇1之起始端， 心子輪射金屬片3qi第—路徑之相同方向内緣旋 第二路徑’且其末端接近於其起始端，其中第二路 一路徑之内緣，並與第一路徑之間互相隔離形成-狹 ^ 徑及第二路徑產生天線之第…第二及第三操作 近；一子輕射金屬片301:之該起始端附 、連接於第一子輻射金屬4 301之饋入點 早則，接至天線系統訊號源；該短路點30“立於該第- 二圍m 連接至第二子輻射金屬片303之短路畔 304，另一知則連接至接地面34 ;介 浐 ^ 片30，並採用微波介質材質，夢古嗲牙^田射金屬 承載該介質基底35。、猎4间5域傳輸效率，接地面34 ^實施例藉由第-子輻射金屬片3〇1 作模態，加上第二子輻射全屬η私立丄 Z 弟一知 不丁铺孟屬片303所產生之第三操作模態 1287319 作頻寬’且其第一路徑長度為第-操作模態的 為操作模態的二分之—波長，而第二路徑長度 :一’、彳Ά的一分之一波長，有效縮短天線裝置整體尺寸， 並利用該起始端及該末端互相靠近，使得 本發明天線在不增加天線㈣複雜度之^^ 加天線頻寬以達成系統所需之頻寬需求。 由J m本發明天狀—實_3的返回敎實驗結果；圖 騎ir 天線之第一操作模態’曲、線42則為該天線之第二 ϊί ίί，線43則為該天線之第三操作模態，由實驗結果可得 tJu =實％例之該三操作模態中心頻率分別為920 MHz、1800 1^)0ΜΗΖ ’阻抗頻寬於3 5:1 VSWR (電壓駐波比）定義 Γμ^ι^γΛ 80随2及280麵2，可滿足行動電話GSM900、 DCS1800及PCS1900系統之頻帶需求。 在本發明說明中所述之實施例僅為說明本發明之原理及 效’而非限制本發明。θ此，習於此技術之人士可在不違背本 行修改及變化。本發明之權利範圍應如 【圖式簡單說明】 第1圖為習知倒F型天線之結構圖。 ，2圖為習知倒F型天線另一實施例之結構圖 ，3圖為本發明較佳實施例之結構圖。 意圖 〇 ，4圖為本發明較佳實施例之返回損失實驗結果示 第5圖為本發明其他實施例結構圖。 第6圖為本發明其他實施例結構圖。 【主要元件符號說明】 10,20,14,24,15—電流路徑 16,25—饋入點 1287319 17,26—短路點 3—本發明之倒F型天線一實施例 3 0—幸备射金屬片 301— 第一子輻射金屬片 302— 饋入點 3〇3 一第二子輻射金屬片 304—短路點 3 4—接地面 35— 介質基底 36— 饋入金屬片 37— 短路金屬片 4一本發明天線一實施例之返回損失 41 一第一操作模態 42 —第二操作模態 43—第三操作模態1287319 玖, INSTRUCTION DESCRIPTION: TECHNICAL FIELD The present invention relates to an inverted-F antenna, and more particularly to an antenna for use in a wireless communication product. [Prior Art] With the rapid development of wireless communication in recent years, in addition to the requirements for electrical characteristics, in addition to the specifications of electrical characteristics, the appearance and practical convenience are gradually diversified, so miniaturization The built-in antenna has become a recent wireless product, and in order to achieve size reduction and maintain the characteristics of the antenna band or broadband in the antenna characteristics, the design of the built-in antenna tends to be complicated. It is not easy to make adjustments in specifications. Therefore, in a limited environment and space, the effective antenna parameters reduce the complexity of the cake and meet the specifications and oceanicity required by the product, which has become an important indicator for the design of the built-in antenna. The rhyme is applied to mobile communication devices such as mobile phones and personal digital assistants (pda) ίίίΐΐ ΐΐ ΐ antenna 'usually adopts inverted F-type antenna design, the conventional inverted F f 31 US Patent No. 6,727,854 " inverted F-type panel antenna , (refer to the first secret line material shouting line, the main line of the radiation feed point 16 and the short circuit point 17 can be roughly divided into three electric 15, the shed the different path excitation material _ resonance frequency, shaped antenna, i H picture) 'It's also uncovered - the kind of built-in type of mobile phone that can be used in mobile phones. The starting point is 25 and the short-circuit point 26, which also becomes dual-frequency 电流 current path 2G and 24, respectively. The resonance mode is used to make use of the tenth, the first design is to increase the bandwidth, the month: the structure of the ,, so that its structure is more complicated, and thus the efficiency is damaging to the simplification: Hand, the demand for multi-frequency operation of the product. In order to solve the problem, we have proposed an innovative design of an inverted-F antenna in the present invention. 1287319: The beginning and end of the chip and the end of the end are close to each other's antenna Gard to achieve the system. Innovative design. Ming content] - ί:: ίί. Κ film, - feed point and a short J point film -, - brother two children radiant metal 疒 short metal piece, 'first; 鳊 and end, the starting end is located in the light: ' /, σ and the first: the second (two) belongs to the film "point is located in the first sub-light gold antenna system signal source;, - metal sheet, near and surrounded by the first - sub-radiation metal sheet; - short-circuit metal The other end is connected to the second sub-light carrier, and the grounding surface is formed by using the first-sub-radiation metal piece and the second sub-light metal piece. In the 1287319 and the second path, a multi-frequency resonance mode is generated, and the operation bandwidth of the antenna is improved, so that the system requirements of the standard communication bands of the δ are paid. [Embodiment] A buckle as shown in Fig. 3 is an embodiment of the inverted-F antenna of the present invention. The third embodiment includes the addition of gold, a sheet 3, a dielectric substrate 35 and a ground plane 34. a ^ ^ = a first sub-radiation metal piece 301, a feed point 302, a second sub-radiation gold fi 3 and a short-circuit point, and a feed metal piece 36 is connected to the feed "," 02, and A short-circuited metal piece 37 is connected to the short-circuit point 304. One of the first sub-radiation metal pieces 3〇1 has a start end and an end, which open the edge of the radiating metal piece, and the end extends in a spiral manner. ^ a path, and the end is close to the starting end and is an open circuit, the end has a gap therebetween; the second sub-light metal sheet has an initial end f钿, the initial end of which is connected to the first sub-radiation metal At the beginning of the slice 3〇1, the inner edge of the metal plate 3qi is in the same direction, the inner edge of the path is rotated by the second path 'and its end is close to its starting end, wherein the second path is the inner edge of the path, and the first The paths are isolated from each other to form a narrow path and a second path to generate an antenna The second and third operations are near; a sub-light metal sheet 301: the feed point attached to the first sub-radiation metal 4 301 is connected to the antenna system signal source; the short-circuit point 30" standing on the first-to-second circumference m connected to the short-circuiting side 304 of the second sub-radiation metal piece 303, the other is connected to the grounding surface 34; the dielectric sheet 30, and using a microwave dielectric material, Menggu fangs ^ The field metal carries the dielectric substrate 35. 4 hunting 5 field transmission efficiency, ground plane 34 ^ embodiment by the first - sub-radiation metal sheet 3 〇 1 modal, plus the second sub-radiation is η private 丄 Z 弟一知不丁铺孟属The third operational mode 1287319 generated by the slice 303 is used as the bandwidth 'and its first path length is the dichotomy-wavelength of the operational mode of the first operational mode, and the second path length is: a' One-hundredth of a wavelength, effectively shortening the overall size of the antenna device, and using the starting end and the end to be close to each other, so that the antenna of the present invention does not increase the complexity of the antenna (four) plus the antenna bandwidth to achieve the required bandwidth of the system. demand. The result of the return 敎 experiment of the celestial-real _3 of the present invention; the first operational mode of the antenna ith antenna, the line 42 is the second ϊίίί of the antenna, and the line 43 is the antenna The three operating modes, from the experimental results can be obtained tJu = real% of the three operating modal center frequencies are 920 MHz, 1800 1 ^) 0 ΜΗΖ 'impedance bandwidth at 3 5:1 VSWR (voltage standing wave ratio) definition Γμ^ι^γΛ 80 with 2 and 280 faces 2, can meet the frequency band requirements of mobile phone GSM900, DCS1800 and PCS1900 systems. The embodiments described in the description of the invention are merely illustrative of the principles and aspects of the invention. θThis person who is familiar with this technology can make changes and changes without violating the Bank. The scope of the present invention should be as described in the following drawings. FIG. 1 is a structural diagram of a conventional inverted-F antenna. 2 is a structural diagram of another embodiment of a conventional inverted-F antenna, and FIG. 3 is a structural diagram of a preferred embodiment of the present invention. Intended view 4 4 is a result of a return loss experiment according to a preferred embodiment of the present invention. FIG. 5 is a structural view of another embodiment of the present invention. Figure 6 is a block diagram of another embodiment of the present invention. [Description of main component symbols] 10, 20, 14, 24, 15 - current path 16, 25 - feed point 1287319 17, 26 - short circuit point 3 - an inverted F antenna of the present invention - an embodiment 3 0 - fortunately Metal sheet 301 - first sub-radiation metal sheet 302 - feed point 3〇3 - second sub-radiation metal sheet 304 - short-circuit point 3 4 - ground plane 35 - dielectric substrate 36 - feed metal sheet 37 - short-circuit metal sheet 4 Return loss 41 of an embodiment of the antenna of the invention - a first operational mode 42 - a second operational mode 43 - a third operational mode