507398 A7 _ B7 五、發明說明（1)507398 A7 _ B7 V. Description of the invention (1)
Ik著手機使用率的日益增加，其輻射之能量是否會對 使用者頭部或身體造成影響也逐漸受到重視。手機主要的 輻射部份即為手機天線，因此如何使天線在達成良好輻射 的前提下又能減低對使用者身體，特別是其組織最為敏感 的頭部之影響，已成為天線設計的重要考量因素之一。而 其中一個方法即減少往人體方向的輻射強度，使能量較集 中於垂直手機往外的方向，且可改善其天線增益。 經濟部中央標準局員工消費合作社印製 (請先閱讀背面之注意事項再^^^11|^ 在般内藏式手機天線的設計中，常採用具短路輻射 金屬片之小型平板天線或倒F形平板天線，其接地面皆為 平面式之結構，饋入方式則由一饋線穿過接地面經由一金 屬探針垂直往上饋入於輻射金屬片上(如圖工結構)，而輻射 金屬片$置放於手機頂端背部。此種類型之天線其輻射特 性雖然不像一般單偶極天線為全向性，不過在垂直手機往 外及往内的輻射能量強度相差也不會太大，因此當為了使 手機之收發良好而增加輻射能量強度時，相對也會使往使 用者頭部方向輻射能量增強，造成可能的電磁波輕射傷 害。為了改善此種情況，使得手機天線在垂直手機往外及 往内的輻射能量強度能相差更大，我們提出了一個創新的 具有L形接地面之倒F形平板天線，利用此一簡單l形接 地面結構，可有效降低手機天線往使用者方向之背^輕 射，使電磁波能量更集令於手機對外之收發方向，來解^ 此-問題，並可增加天線之增益，增進手機的通訊品質1、 本發明天線之結構十分簡單，主要是利用一個l形接 i也面，此接地面由兩^組成’-輕絲射金屬片方 I張尺^適用中國國家標準（CNS) ~~~ ____ 507398 A7 ______ B7 六、發明說明（2) --r ------装-- w - (請先閱讀背面之注意事項再^^4頁) 向之垂直接地面，另一部份則為平行輻射金屬片方向之水 平接地面。而其饋入方式，可選擇由穿過垂直接地面以水 平方式饋入，或穿過水平接地面垂直往上饋入。經由適當 調整饋入位置與短路金屬棒之距離，可使天線輕易達成阻 抗匹配。由於此天線具有結構簡單、饋入方式彈性大且可 降低天線之背向輻射，因此十分適合應用於行動通訊手機 天線設計上，具有極高之產業應用價值。 線 參考圖2，本發明之具有L形接地面之倒F形平板天 線2的一種實施例包括：一矩形輻射金屬片21、一 l形接 地面22、一短路金屬棒23、一平行於輻射金屬片的饋入探 針24、一天線基底25。矩形輻射金屬片21為天線主要輻 射部份，L形接地面22包含一水平接地面221及一垂直接 地面222，用以與訊號地端相接，同時水平接地面221可視 為手機之接地面；短路金屬棒23用以連接輻射金屬片21 與接地面22 ;饋入探針24貫穿L形接地面22與矩形輻射 至屬片21連接，用以傳遞訊號；天線基底μ可為介電常 數接近空氣的介質，亦可直接使用空氣。 經濟部中央標準局員工消費合作社印製 k 本赉明天線设計於應用在第三代行動通訊系統 (1920-2170 MHz)的-種實施例，其矩形輻射金屬片21尺 寸為15 X 30 mm2，水平接地面221尺寸為6〇 χ 4〇 _2， 垂直接地面222尺寸為40 X 8 mm2，天線基底25為一厚度 為7 mm的空氣介質，饋入探針24長度為2 _。天線的 貝作畺測結果於第3至6圖中說明。由圖3反射損失結果 一可得到天線的阻抗頻寬為310MHz (1 ·· 2電壓駐波比阻抗 本紙€尺度適票準(CNsTUi格(21〇χ297¥Ϊ) 一--—— 刈7398 A7 --—— B7 七、發明說明（3) ~ -一 頻寬之定義），可輕易涵蓋！至217〇廳之頻帶。 圖4所示為本發明天線中心操作頻率幸畐射場型量测結 果，圖5則為在相同操作頻率下，將垂直接地面移除，產 將饋入改由水平接地面垂直往上之一般習知饋入方式(如 圖1結構）’所得到之輻射場型量測結果。比較圖4及圖$， 可知本發明天線之背向||射較—般習知之設計方式有明顯 減低。 圖6為操作頻帶内之天線增益實驗量測結果，本發明 天線頻帶内增盈都在2 dBi以上，且增益變化量小於12 dBi ’同時較一般習知之設計方式的增益為佳。圖7則為本 發明天線之其他實施結構圖。圖7(a)所示為本發明天線由 水平接地面垂直往上之饋入方式；圖7(b)&(c)則為雙[形 接地面(具有二個垂直接地面722及723)應用於兩種不同方 式之饋入。 經濟部中央標準局員工消費合作社印製 上述實施例僅為說明本發明之原理及其功效，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。本發明之權利範圍應 如後述之申請專利範圍所列。 本紙張尺度適用中國國家標準（CNS) A4規格（210x297公釐） 507398 ' A7 B7 五、發明說明（4) [圖式簡单說明] 第1圖為一習知之倒F形平板天線結構圖。 第2圖為本發明天線之一實施例結構圖。 第3圖為本發明天線之反射損失的實驗結果。 第4圖為本發明天線輻射場型實驗結果。 第5圖為一習知倒F形平板天線輻射場型實驗結果。 第6圖為操作頻帶内天線增益的實驗結果。 第7圖為本發明天線之其他實施結構圖。 (請先閱讀背面之注意事項再頁) 裝 線 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS) A4規格（210x297公釐） 川7398 A7 B7 五、發明說明（5) [元件符號說明] 習知之倒F形平板天線 U :輻射金屬片 12 :接地面 13 :短路金屬棒 14 :饋入探針 22 : L形接地面 222 :垂直接地面 231 :輻射金屬片上之短路點 241 :輻射金屬片上之饋入點 2·具有L形接地面之倒F形平板天線之一實施例 21 :輻射金屬片 221 ··水平接地面 23 ·短路金屬棒 24 ·饋入探針 25 ·天線基底 61 :本發明天線增益實驗結果 62 :習知之倒F形平板天線增益實驗結果 7 ： 具有L形接地面之倒F形平板天線之其他實施例 經濟部中央標準局員工消費合作社印製 71 :輻射金屬片 721 :水平接地面 723 :垂直接地面 74 :饋入探針 72 : L形接地面 722 ·垂直接地面 73 :短路金屬棒 75 :天線基底 本紙張尺度適用中國國家標準（CNS) A4規格（21〇χ297公釐）Ik is increasing the use of mobile phones, and whether the radiated energy will affect the user's head or body has also received increasing attention. The main radiation part of the mobile phone is the mobile phone antenna. Therefore, how to make the antenna reduce the impact on the user's body, especially the most sensitive head of the organization, under the premise of achieving good radiation, has become an important consideration in antenna design. one. One of the methods is to reduce the intensity of radiation towards the human body, so that the energy is more concentrated in the outward direction of the vertical mobile phone, and the antenna gain can be improved. Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back first ^^^ 11 | ^ In the design of general built-in mobile phone antennas, small flat antennas with short-circuiting radiating metal sheets or inverted F Flat-panel antenna, the ground plane of which is a flat structure, the feeding method is a feeder through the ground plane through a metal probe to feed vertically upwards on the radiating metal sheet (as shown in the figure), and the radiating metal sheet $ Is placed on the top and back of the mobile phone. Although the radiation characteristics of this type of antenna are not omnidirectional like ordinary single dipole antennas, the difference in the radiant energy intensity of the vertical mobile phone outward and inward will not be too great, so when Increasing the radiant energy intensity in order to make the mobile phone transmit and receive well will relatively increase the radiant energy in the direction of the user's head, which may cause light electromagnetic wave damage. In order to improve this situation, make the mobile phone antenna vertical and outward. The radiant energy intensity inside the energy can be more different. We propose an innovative inverted F-shaped flat plate antenna with an L-shaped ground plane. Using this simple l-shaped ground plane junction , Can effectively reduce the back of the mobile phone antenna towards the user ^ light emission, so that the electromagnetic wave energy is more concentrated in the mobile phone's receiving and sending direction to solve ^ this-problem, and can increase the antenna gain, improve the communication quality of the mobile phone 1, The structure of the antenna of the present invention is very simple. It mainly uses an l-shaped connection surface. This ground surface is composed of two ^ '-light wire shot metal sheet square I ruler. ^ Applicable to China National Standard (CNS) ~~~ ____ 507398 A7 ______ B7 VI. Explanation of the invention (2) --r ------ install-w-(Please read the precautions on the back before p. ^^ 4) The vertical ground plane facing the other side is parallel The horizontal ground plane in the direction of the radiating metal sheet. The feeding method can be selected to feed horizontally through the vertical ground plane or vertically upward through the horizontal ground plane. Through proper adjustment of the feeding position and short-circuit metal The distance of the rod allows the antenna to easily achieve impedance matching. Because this antenna has a simple structure, a flexible feeding method, and can reduce the back radiation of the antenna, it is very suitable for the design of mobile phone antennas and has a very high industry Application price Referring to FIG. 2, an embodiment of the inverted-F flat panel antenna 2 with an L-shaped ground plane according to the present invention includes: a rectangular radiating metal sheet 21, an L-shaped ground plane 22, a short-circuit metal rod 23, and a parallel A feed probe 24 for the radiating metal sheet and an antenna substrate 25. The rectangular radiating metal sheet 21 is the main radiating part of the antenna, and the L-shaped ground plane 22 includes a horizontal ground plane 221 and a vertical ground plane 222 for communicating with signals. The ground ends are connected, and at the same time, the horizontal ground plane 221 can be regarded as the ground plane of the mobile phone; the short-circuit metal rod 23 is used to connect the radiating metal sheet 21 and the ground plane 22; the feeding probe 24 penetrates the L-shaped ground plane 22 and the rectangular radiation sheet. 21 connection for transmitting signals; the antenna substrate μ can be a medium with a dielectric constant close to air, or air can be used directly. Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. This Benming antenna is designed to be used in an embodiment of the third generation mobile communication system (1920-2170 MHz). The rectangular radiating metal sheet 21 has a size of 15 X 30 mm2. The size of the horizontal ground plane 221 is 60 × 40, the size of the vertical ground plane 222 is 40 × 8 mm2, the antenna substrate 25 is an air medium with a thickness of 7 mm, and the length of the feeding probe 24 is 2 mm. The results of the antenna speculation are illustrated in Figures 3 to 6. From the reflection loss results in Fig. 3, the impedance bandwidth of the antenna can be obtained as 310MHz (1 ·· 2 voltage standing wave ratio impedance on this paper. The standard is suitable for the standard (CNsTUi grid (21〇χ297 ¥ 一) one ------ 刈 7398 A7 --—— B7 VII. Explanation of the invention (3) ~-Definition of a bandwidth), which can be easily covered! The frequency band is up to Hall 217. Figure 4 shows the measurement results of the antenna center operating frequency of the present invention. Figure 5 shows the radiation field pattern obtained from the conventional conventional feeding method (the structure shown in Figure 1) where the vertical ground plane is removed at the same operating frequency, and the feed is changed from the horizontal ground plane to the vertical direction. Measurement results. Comparing Fig. 4 and Fig. $, It can be seen that the back direction of the antenna of the present invention is significantly reduced. The conventional design method is significantly reduced. Fig. 6 shows the experimental measurement results of the antenna gain in the operating frequency band. The internal gains are all above 2 dBi, and the gain variation is less than 12 dBi '. At the same time, the gain is better than the conventionally known design method. Figure 7 is another structural diagram of the antenna of the present invention. Figure 7 (a) shows The feeding method of the antenna of the present invention from the horizontal ground plane vertically upwards; FIG. 7 (b) & a mp; (c) is a double-shaped ground plane (with two vertical ground planes 722 and 723) applied to the feed in two different ways. Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs The principle of the invention and its effects do not limit the invention. Therefore, those skilled in the art can modify and change the above embodiments without departing from the spirit of the invention. The scope of the rights of the invention should be the scope of the patent application described later The paper size is applicable to Chinese National Standard (CNS) A4 (210x297 mm) 507398 'A7 B7 V. Description of the invention (4) [Simplified description of the figure] Figure 1 is a conventional inverted F-shaped flat antenna Structural diagram. Figure 2 is a structural diagram of an embodiment of the antenna of the present invention. Figure 3 is an experimental result of the reflection loss of the antenna of the present invention. Figure 4 is an experimental result of the radiation pattern of the antenna of the present invention. Figure 5 is an exercise Know the experimental results of the radiation field pattern of the inverted F-shaped flat antenna. Figure 6 shows the experimental results of the antenna gain in the operating frequency band. Figure 7 shows the other implementation structure of the antenna of the invention. (Please read the precautions on the back first) line Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. The paper size is applicable to the Chinese National Standard (CNS) A4 (210x297 mm). Chuan 7398 A7 B7 V. Description of the invention (5) [Element symbol description] Known inverted F-shaped flat antenna U: Radiant metal sheet 12: Ground plane 13: Short-circuited metal rod 14: Feed probe 22: L-shaped ground plane 222: Vertical ground plane 231: Short-circuit point on the radiant metal sheet 241: Feed point on the radiant metal sheet 2 One of the inverted F-shaped flat panel antennas with an L-shaped ground plane. Example 21: Radiation metal sheet 221 ·· Horizontal ground plane 23 · Short-circuited metal rod 24 · Feed probe 25 · Antenna base 61: Antenna gain experimental results 62 of the present invention : Known experimental results of inverted F-shaped flat plate antenna gain 7: Other examples of inverted F-shaped flat plate antenna with L-shaped ground plane Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 71: Radiation metal sheet 721: Horizontal ground plane 723: Vertical ground plane 74: Feeding probe 72: L-shaped ground plane 722 · Vertical ground plane 73: Short-circuited metal rod 75: Antenna base This paper applies the Chinese National Standard (CNS) A4 specification (21 × 297 mm)