200537746 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一種低側高天線，特別是指一種在降 低平板天線側面高度的同時，不影響天線頻寬並能降低天 5 線的SAR值之低側高天線。 【先前技術】 在無線通訊裝置上，由於内部天線（internal antenn^ 又稱intemia)具有低側高（low profile，低側面高度，簡稱 低側高）及低SAR(Specific Absorption Ratio，特定吸收率 1〇 ，指人體所吸收之電磁輻射量量測值）值等因素，使得内 部天線逐漸地取代了現有行動電話使用之外露式天線。 内部天線主要可分成兩種： (1) 無接地微帶線平板天線（microstrip patch without ground connection)7 ，如圖1所示，又稱半波長微帶線 15平板天線（Ha〗f-wave microstrip patch)，此種天線雖具有 絕佳的天線效此’但由於需要較大的輻射面積，因此通常 應用在基地台、太空梭及導彈等大型裝置上。200537746 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a low-side high antenna, in particular to a method for reducing the side height of a flat-panel antenna without affecting the antenna bandwidth and reducing the SAR value of the antenna. Low side high antenna. [Previous technology] On wireless communication devices, because the internal antenna (also known as intemia) has a low profile (low profile, low profile height, referred to as low profile) and a low SAR (Specific Absorption Ratio, specific absorption ratio 1) 〇, refers to the measured value of the amount of electromagnetic radiation absorbed by the human body, etc., making the internal antenna gradually replace the external antenna used by the existing mobile phones. The internal antenna can be divided into two types: (1) microstrip patch without ground connection7, as shown in Figure 1, also known as the half-wavelength microstrip line 15 flat antenna (Ha〗 f-wave microstrip Patch), although this antenna has excellent antenna performance, but because it requires a large radiation area, it is usually applied to large devices such as base stations, space shuttles and missiles.
(2) 有接地微帶線天線（micr〇strip with connection”，如圖 2 所示，又稱 piFA(pianar inverted F 20 Antenna，倒F型天線）’其具有一與位於其下方之一接地 面9上的一饋入部91電性連接之饋入點81，以及一與接 地面9電性連接之接地點82。 且由於PIFA利用”接地，， 使微帶天線的長度縮短至四 所產生之映射（mapping)效應 分之一波長，因而適合被應 200537746 用在行動電話以及其他以空間/尺寸為首要考量的無線裝 置上’所以-般行動電話使用之内部天線大都為陋。 ‘ PIFA擁有某些特性，其中最重要的則屬其尺寸與頻 寬^ M # ’因為PIFA的頻寬係由其體積（長（L)X寬（W)X 高⑽所決定’其中又以其高度⑻對頻寬影響甚巨。此 卜由於PIFA的共振頻率係由其邊長（即長寬㈤⑽ 決定’因此可藉由在PIFA上形成電感性負載（例如在 PIFA之平板上開槽），或者在⑽上形成電容性負載（例 ίο 々將PIFA之平板的局部弯折使接近於接地面）改變其邊長 而調整PIFA的共振頻率。 此外，PIFA又被稱之為一，，電場天線，，，亦即piFA的 共振頻率係由其所形成之電場所控制。且當在_ PM上 形成複數個頻帶共振區（即多頻天線）時，這㈣帶共振區 將會互相影響’亦即當某一頻帶共振區的長度改變時，其 15他頻帶共振區的共振頻率亦會受到影響，而具有較高之^ 麵性（hi coupling)。 再者’隨著行動電話越來越輕薄短小，行動電話的 内部空間變得更加有限，因此一些降低plFA側高以減少 PIFA體積的方法被相繼提出。例如在ριρΑ與接地面之間 2〇夾置一介電材料，可ttPIFA❸體積相對於介電材料的二 電常數成比例地減少，但此一作法卻會造成piFA頻寬縮 紐而無法符合規格要求。而這雖然可藉由一平面型外露式 天線來增加（補償）PIFA所損失的頻寬，但是外露式天線 在罪近使用者身體時，其所產生的SAR值卻超出目前的 200537746 限制（FCC ·· 1.6Mw/g ; EU ·· 2 〇Mw/g)。 另外’ PIFA的一個值得注咅 合首掊為％ i甘 …的特性是，其頻寬並不 曰直接又叹在其下方的接地面尺寸塑， 接地面邊長（即長+寬）長度的影響。 P «又到4 【發明内容】 因此，本發明之目的，在 、 杜於誕供一種可縮小平板天 線體積卻不會縮短其頻寬，& 兑而此達到低側高及低SAR需 求之低側高天線。 而 ίο 15 於是’本發明之低側高天線，包括一輻射元件及一 接地面。該輻射元件具有一輻射面，以及設在該輕射面上 之:饋人點。該接地面與該輻射元件相間隔地上下叠置， 且/接地面上$成有一饋入部與該饋入點電性冑接。其特 徵在於：在該接地面上更形成一槽狀輕射部，其具有一位 於該饋入部之第一端，一位於該接地面的一邊緣之第二端 及-連接該兩端之槽道。藉此，可在降低該輕射元件 側问的同時，利用該槽狀輕射部，可補償該輻射元件因降 低側鬲所損失之頻寬，並降低天線之SAR值。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效， 在以下配合參考圖式的二較佳實施例的詳細說明中，將可 清楚的明白。 如圖3所示，是本發明低側高天線1的第一較佳實 施例’其包括一輻射元件2及一接地面3，且在本實施例 中，低側高天線1係以設在一小型無線通訊裝置（例如行 20 200537746 動電話)中為例。其中接地面3係一形成在一絕緣基板(例 如印刷電路板）30的-面上之鋼羯，並在接地面3上設有 一與一訊號傳輸線（圖未示）連接之饋入部31，且饋入部 3 1係與接地面3相絕緣地設在絕緣基板3 〇上。 5 輻射兀件2係與接地面3相對且相間隔地設在接地 15(2) There is a grounded microstrip antenna (micr0strip with connection), as shown in Figure 2, also known as piFA (pianar inverted F 20 Antenna, inverted F antenna), which has a ground plane and a ground plane located below it. A feed point 91 electrically connected to the feed point 81 on 9 and a ground point 82 electrically connected to the ground plane 9. And because PIFA uses "grounding", the length of the microstrip antenna is shortened to four. The mapping effect is one-half wavelength, so it is suitable for 200537746 to be used on mobile phones and other wireless devices with space / size as the primary consideration. Therefore, most internal antennas used by mobile phones are mostly ugly. These characteristics, the most important of which are its size and bandwidth ^ M # 'Because the bandwidth of PIFA is determined by its volume (length (L) X width (W) X height ⑽' Bandwidth has a huge impact. This is because PIFA's resonance frequency is determined by its side length (ie, length and width ㈤⑽), so it can be formed by inductive load on PIFA (such as slotting on PIFA plate), or ， Capacitive load (eg ο 々 The local bending of the flat plate of the PIFA is brought close to the ground plane.) The resonance frequency of the PIFA is adjusted by changing its side length. In addition, the PIFA is also called one, the electric field antenna, which is the resonance frequency system of the piFA. It is controlled by the electric field formed by it. And when multiple frequency band resonance zones (ie, multi-frequency antennas) are formed on _ PM, the band resonance zones will affect each other ', that is, when the length of a certain frequency band resonance zone changes At the same time, the resonance frequency of the other 15 resonance frequency bands will also be affected, and it will have a high coupling (hi coupling). Furthermore, as mobile phones become thinner and shorter, the internal space of mobile phones becomes more Limited, so some methods to reduce the side height of plFA to reduce the volume of PIFA have been proposed successively. For example, a dielectric material is sandwiched between ριρΑ and the ground plane, and the volume of PIFA❸ can be proportional to the dielectric constant of the dielectric material. Reduced, but this method will cause the piFA bandwidth to shrink and fail to meet the specifications. Although this can be increased (compensated) by a flat-type exposed antenna, the bandwidth lost by PIFA is exposed. When the antenna is close to the user ’s body, the SAR value it generates exceeds the current 200537746 limit (FCC · 1.6Mw / g; EU · · 2 〇Mw / g). In addition, a PIFA is worthy of note. The characteristic of 掊 %% gan is that its bandwidth is not directly sighed by the size of the ground plane below it, and the influence of the length of the side of the ground plane (ie, length + width). P «Again to 4 [Content of the invention Therefore, the purpose of the present invention is to provide a low-side high antenna that can reduce the size of a flat-panel antenna without shortening its bandwidth, and achieves the low-side high and low SAR requirements. And ίο 15 Therefore, the low-side high antenna of the present invention includes a radiating element and a ground plane. The radiating element has a radiating surface and a feeding point provided on the light emitting surface. The ground plane and the radiating element are stacked on top of each other at an interval, and a feed portion is electrically connected to the feed point on the ground plane. It is characterized in that a groove-shaped light-emitting portion is further formed on the ground plane, which has a first end located on the feeding portion, a second end located on an edge of the ground surface, and a groove connecting the two ends. Road. Thereby, while reducing the side question of the light emitting element, the slot-shaped light emitting part can be used to compensate the frequency bandwidth lost by the radiating element by reducing the side chirp, and reduce the SAR value of the antenna. [Embodiment] The foregoing and other technical contents, features, and effects of the present invention will be clearly understood in the following detailed description of two preferred embodiments with reference to the drawings. As shown in FIG. 3, it is a first preferred embodiment of the low-side high antenna 1 according to the present invention, which includes a radiating element 2 and a ground plane 3, and in this embodiment, the low-side high antenna 1 is provided at Take a small wireless communication device (such as line 20 200537746 mobile phone) as an example. The ground plane 3 is a steel cymbal formed on the -side of an insulating substrate (such as a printed circuit board) 30, and the ground plane 3 is provided with a feeding portion 31 connected to a signal transmission line (not shown), and The feed-in part 31 is provided on the insulating substrate 30 so as to be insulated from the ground plane 3. 5 The radiating element 2 is opposite to the ground plane 3 and is arranged on the ground at an interval of 15
面3上方，其具有一輻射面2〇以及設在輻射面別上之一 饋入點21及一接地點22。輻射面2〇係一矩形金屬平板 ’習稱平板天線（patch antenna)，且為避免扭曲變形，賴 射面20通常被貼附在一絕緣基材（圖未示）上，再疊置在 1〇接地面3上方。饋入點21係與接地面3上之饋入部則 丨生連接’以將由饋入部3 !輸出的訊號傳送至輻射面川上 輻射出去，或者將輻射面2G接收之訊號傳送至饋入部Μ ,接也J 22係與接地面3電性連接，而使輻射元件2 成 PIFA 即所谓之，，電場天線（electric field antenna)，， 而且藉由接地點22與接地面3連接，使得輻射元件2 幸射面20的表面積只需等效於共振頻率的四分之一波Above the surface 3, it has a radiating surface 20 and a feeding point 21 and a grounding point 22 provided on the radiating surface. The radiating surface 20 is a rectangular metal flat plate, commonly known as a patch antenna. In order to avoid distortion, the radiating surface 20 is usually attached to an insulating substrate (not shown), and then stacked on top of 1 〇 Above ground plane 3. The feed point 21 is connected to the feed section on the ground plane 3 to transmit the signal output by the feed section 3! To the radiating surface and radiate it, or the signal received by the radiating surface 2G to the feed section M, then The J 22 series is electrically connected to the ground plane 3, and the radiating element 2 becomes a PIFA. So-called, an electric field antenna, and the ground point 22 is connected to the ground plane 3, so that the radiating element 2 is fortunate. The surface area of the emission surface 20 need only be equivalent to a quarter wave of the resonance frequency
長（約為無接地平板天線表面積的一半），故適用於行動電 話等小型無線通訊裝置中。 y %备然，如圖4所示之另一實施態樣，當輻射元件4 係:在大型無線通訊裝置上（亦即不以體積大小為主要 曰）夺輻射元件4即可不與接地面3電性連接（亦即不 X置接地點）’而形成一無接地平板天線，惟如此一來， 幸田射兀件4的輻射面4〇面積必須為輻射元件2的輻射面 2 0面積的大約兩倍大。 7 200537746 參閱圖3所示，由於輕射元件 係由輻射面2的邊具γ B 振頻率 實施例中，係設;12蝴+寬（W))所決定，所以在本It is long (about half of the surface area of an ungrounded flat panel antenna), so it is suitable for small wireless communication devices such as mobile phones. y% Note, as shown in another embodiment shown in FIG. 4, when the radiating element 4 is: on a large wireless communication device (that is, the size of the radiating element 4), the radiating element 4 may not be connected to the ground plane 3 Electrically connected (ie, no X ground point) to form a groundless flat plate antenna, but in this case, the area of the radiation surface 40 of the Kota firing element 4 must be approximately the area of the radiation surface 2 of the radiation element 2 Twice as big. 7 200537746 As shown in FIG. 3, since the light emitting element is determined by the side of the radiating surface 2 with a γ B frequency, in the embodiment, it is determined by 12 butterfly + width (W)).
Hz(高頻段)產 的長寬，使輪射面2〇能夠在 在輻射面2。上形成：電振：，5所示，亦可藉由 .^ ^ 電感性負載23(即在輻射面20上形 成一由邊緣往内延伸之描 上幵/ 2〇上形成一電容性負載曰广 3)’或者藉由在輻射面 負載24(即在輻射面20的一邊緣 一朝接地面3方向向τ4 透緣幵/成 内白下考折，使接近接地面3 ίο 15The length (width) produced by the Hz (high frequency band) enables the wheel emission surface 20 to be on the radiation surface 2. Formed on: Electrical vibration:, 5, can also be formed by. ^ ^ Inductive load 23 (that is, a radiating surface 20 inwardly extending from the edge to form a trace 幵 / 20 to form a capacitive load: Wide 3) 'or by approaching the radiation surface load 24 (that is, at one edge of the radiation surface 20 toward the ground plane 3 to τ4 through the edge 成 / into the white space, make it close to the ground plane 3 ίο 15
叫的方式，來改變轄射面20的共振頻率且HTo change the resonance frequency of the shooting surface 20 and H
可知，輕射元件2的頻寬雖由其體積，即輕 J 積與高度(即輕射面2。與接地面3的 表面 卿叫H))所決定，但卻以其高 = 頻寬最巨。 儿〜音 因此，如圖3所示，本發明之特徵在於，在接地面3 上更形成一槽狀輻射部6’其具有一與饋入部31相鄰之 第一端6丨，一位於接地面3的一邊緣33之第二端α，以 及一連接第一及第二端61、62之槽道63。其中槽道〇 係藉由將由接地面3之第一端61朝接地面3之邊緣33方 向延伸至第二端62之路徑上的金屬去除而產生，並形成 如圖1所示之一基本態樣。藉此，在接地面3上形成一類 似方、磁場天線（magnetlc field antenna)，，之槽狀天線 (slot antenna) ’並設計該槽狀天線的形狀構造，使恰可在 一低頻段（900Hz)產生共振。因此，低側高天線2藉由輻 射元件2以及形成在接地面3上之槽狀輻射部6，成為一 20 200537746 可作用在鬲、低兩不同頻段（1900MHz及900MHz)之雙頻 天線。 此外，槽狀輻射部6之共振頻率更可藉由適當設計 其形：及構造來加以改變。例如圖6所示，令槽狀輻射部 6之槽道64形成一呈鋸齒狀連續彎曲之形狀；或如圖] 所示，令槽狀輕射部6形成一 L形，亦即由其第一端61 朝與槽道63垂直方向向外延伸形成一第一支臂65 ;或如 圖？所不’令槽狀輻射部6形成一 ？型，亦即除了上述 10 15 卜支煮65，更由槽道63中央處朝與第一支臂65同 側且平行方向延伸―第二支冑66;抑或如_ 9所示，令 槽狀輪射部6 彡# ^一 P jt,1 . ^ 形成 E型，亦即除了上述第一及第二支 ^ 66外’更由槽道63之接近第二端62處，朝與第 二支臂66同側且平行方向延伸一第三支臂67;藉此λ曾 加槽狀輕射部6之總長度，卩改變其在低頻段之共振頻率 特別是’藉由在接地面3上形成槽狀輻射部6後， 可使得接地面3的總長度變長，且根據上述驗與接地 面總長度之關係可知，當接地面之總長度增加時，職 的頻寬亦將隨之增加。因此，當為了縮小輻射元件（即 )2的體積而將輻射元件2的高度降低時，輻射元件2 :降低南度所損失之頻寬，將可藉由接地面3上槽狀輻射 部6左的形成獲得補償’而克服了習知職在高度降低時 頻隨之縮短的問題。所以，藉由在接地面3上形成槽狀 輕射部6,除了使低側高天，線"曾加-低頻收發頻段外， 20 200537746 更使得輕射元件2在縮小體積（即降低高度）的同時，不會 使其頻寬跟著縮短’而仍能符合規格要求，並達到將目前 之低側高天線（PIFA)的體積進一步縮小的目的。 除此之外，由於低側高天、線丨的高、低頻天線（即輕 5射元件2與槽狀輕射部6)之共振頻率係分別由其電、磁 場所控制，且並非形成在同一平板(patch)上，因此具有較 低之互耗性（l〇w coupling)。所以，當輕射元件2或形成 在接地面3上之槽狀輻射部6的構造或形狀有所改變時， 彼此的共振頻率即不易受到影響。 1〇 此外，圖10係槽狀輻射部6形成如圖8所示之F型 槽道形式時，針對低侧高天線】之量測結果，由圖中可知 當低側高天線1作用在低頻段（即槽狀輻射部6)時，由饋 入部31饋入之電流25會沿著槽狀輻射部6之槽道63及 第支煮65擴散到整個接地面3上，藉而降低SAR的峰 15值。再由圖11顯不之量測結果可知，當低側高天線1作 用在高頻段（即輻射元件2)時，由於輻射元件2下方有接 地面3遮蔽，類似於傳統具有接地面之内部天線構造，可 防止電磁波朝接地面方向（即人體方向）輻射，而能夠使 SAR值維持在限定範圍内。 20 而且’如圖12所示，為槽狀輻射部6形成如圖8所 不之F型槽道形式時，量測低側高天線1之 SWH(Standing Wave Ratio,電壓駐波比）值所得到的結果， 且由圖12中可知，低側高天線i在高、低頻段（9〇〇MHz 及1900MHz)部分皆具有良好的SWR值及頻寬。 10 200537746 此外，為進-步縮小轄射元件2的體積， =方本:施例更可在接地面3之槽狀輕射部6(參二 亦即在輻射元件2與槽狀輻射部6之間，放置θ 電材料7。’藉此，可使輕射元件2的體積隨置：介 的介電係數成比例地縮小（亦即降低輻射元件2的” 後’再藉由調整槽狀㈣部6之形狀構造來補償;；^ 件2因介電材料7〇的加入所損失之頻寬。 ίο 15 再者’如圖14所示’本實施例更可進—步地 在介電材料70表面局部佈設_層金屬71，來改呈^ =二電磁場的方向性，使槽狀輻射部6產生之電磁： 更為集中，而能夠降低SAR值並提升其輕射效率。 —再參照圖15所示，是本發明低側高天線的第二較佳 貫施例，其與第一實施例唯-不同之處在於，輻射元件5 並非一平板（patch) ’而是一單極天線（则卿*咖叫 ，其一端設有一接地點51與接地面3電性連接，並在與 接地點51間隔一適當距離處設置一饋入點52，並愈接地 面3上之饋人部31電性連接，藉此形成—piFA，並可藉 由在接地面3上形成之槽狀輻射部6’來補償因降低輻射 元件5之高度所損失的頻寬，以及達到如上述由槽狀輻射 部6所帶給輪射元件5的種種好處。 綜上所述，本發明藉由在低側高天線丨之接地面3 上形成槽狀輻射部6’除了形成一可在低頻段（9〇〇MHz)產 生共振之槽狀天線外，更可藉由槽狀輻射部6補償作用在 高頻段（1900MHz)之輻射元件2、5因降低高度所損失之 20 200537746 ίο v員寬’而且，#由將低側高天線1之高、低頻段天線分別 形f在各自獨立的元件(即輻射元件2、5及接地面3之槽 "田射邛6)上’使輻射元件2、5及槽狀輻射部6不致因 各自：狀構造的調整’而影響到彼此之共振㈣；此外， 更可猎由在槽狀輻射部6上面覆蓋介電材肖並對槽狀 輻射# 6進仃適當調整’而在不致影響輻射元件2、5頻 寬的情況下’進一步降低輻射元# 2、5之高度，使更能 符合低側高之要求；另外，亦可藉由在介電㈣5〇之表 面局部佈設-層金$ 52，來改善槽狀輻射部6之方向性It can be seen that although the bandwidth of the light emitting element 2 is determined by its volume, that is, the light J product and height (that is, the light emitting surface 2. The surface of the ground plane 3 is called H), but its height = the most bandwidth huge. Therefore, as shown in FIG. 3, the present invention is characterized in that a groove-shaped radiation portion 6 ′ is further formed on the ground plane 3 and has a first end 6 丨 adjacent to the feeding portion 31, A second end α of an edge 33 of the ground 3 and a channel 63 connecting the first and second ends 61 and 62. The channel 0 is generated by removing the metal on the path extending from the first end 61 of the ground plane 3 toward the edge 33 of the ground plane 3 to the second end 62, and forms a basic state as shown in FIG. 1 kind. Thereby, a similar square, magnetic field antenna, a slot antenna is formed on the ground plane 3, and the shape structure of the slot antenna is designed so that it can be used in a low frequency band (900Hz). ) Resonance. Therefore, the low-side high antenna 2 through the radiating element 2 and the slot-shaped radiating portion 6 formed on the ground plane 3 becomes a dual-band antenna that can operate in two different frequency bands (1900MHz and 900MHz). In addition, the resonance frequency of the trough-shaped radiating portion 6 can be changed by appropriately designing its shape and structure. For example, as shown in FIG. 6, the groove 64 of the groove-shaped radiation portion 6 is formed into a continuously curved shape in a zigzag shape; or as shown in FIG., The groove-shaped light-emitting portion 6 is formed into an L shape, that is, the first One end 61 extends outward in a direction perpendicular to the channel 63 to form a first arm 65; or as shown in the figure? What's so that the trough-shaped radiation portion 6 forms one? Type, that is, in addition to the above-mentioned 10 15 buzhi boil 65, the center of the channel 63 extends to the same side and parallel to the first arm 65-the second branch 胄 66; or as shown in _ 9轮 射 部 6 彡 # ^ 一 P jt, 1. ^ Forms an E-shape, that is, in addition to the above-mentioned first and second branches ^ 66 ′, it is further from the channel 63 near the second end 62 toward the second branch The arm 66 extends a third arm 67 on the same side and in the parallel direction; by this, λ has added the total length of the slot-shaped light-emitting portion 6 to change its resonance frequency in the low frequency band, especially by forming on the ground plane 3 After the slot-shaped radiating portion 6, the total length of the ground plane 3 can be made longer, and according to the relationship between the above-mentioned test and the total length of the ground plane, it can be known that as the total length of the ground plane increases, the bandwidth of the job will also increase accordingly. Therefore, when the height of the radiating element 2 is reduced in order to reduce the volume of the radiating element 2 (ie), the radiating element 2: reducing the frequency bandwidth lost in the south, can be left by the slot-shaped radiating portion 6 on the ground plane 3 The formation of compensation will overcome the problem of shortening the time and frequency of acquaintances as they decrease in height. Therefore, by forming a trough-shaped light-emitting portion 6 on the ground plane 3, in addition to making the low side high, the line "Zengjia-low-frequency transceiver frequency band," 20 200537746 makes the light-emitting element 2 reduce the volume (that is, reduce the height) At the same time, it will not shorten its bandwidth and still meet the specifications, and achieve the purpose of further reducing the size of the current low-side high antenna (PIFA). In addition, since the low-side high-sky, high-frequency and low-frequency antennas of the line (ie, the light-emitting element 2 and the slot-shaped light-emitting part 6) resonance frequencies are controlled by their electric and magnetic fields, respectively, and are not formed in It is on the same patch, so it has lower mutual consumption (10w coupling). Therefore, when the structure or shape of the light emitting element 2 or the groove-shaped radiating portion 6 formed on the ground plane 3 is changed, the resonance frequencies of each other are not easily affected. 10 In addition, when the slot-shaped radiating portion 6 of FIG. 10 is formed in the form of an F-shaped channel as shown in FIG. 8, the measurement results for the low-side high antenna are shown in the figure. In the frequency band (ie, the trough-shaped radiating portion 6), the current 25 fed by the feeding portion 31 will spread along the channel 63 and the first branch 65 of the trough-shaped radiating portion 6 to the entire ground plane 3, thereby reducing the SAR. Peak 15 value. According to the measurement results shown in FIG. 11, when the low-side high antenna 1 acts on the high frequency band (ie, the radiating element 2), the ground plane 3 is shielded under the radiating element 2, similar to a conventional internal antenna with a ground plane. The structure can prevent electromagnetic waves from radiating toward the ground plane (that is, the direction of the human body), and can maintain the SAR value within a limited range. 20 Moreover, as shown in FIG. 12, when the slot-shaped radiating portion 6 forms an F-shaped channel as shown in FIG. 8, the SWH (Standing Wave Ratio) value of the low-side high antenna 1 is measured. The results obtained, and it can be seen from FIG. 12 that the low-side high antenna i has good SWR values and bandwidths in the high and low frequency bands (900 MHz and 1900 MHz). 10 200537746 In addition, in order to further reduce the volume of the radiating element 2 = = version: the embodiment can be used in the slot-shaped light-emitting portion 6 of the ground plane 3 (see the second, that is, in the radiating element 2 and the slot-shaped radiating portion 6). Between them, a θ electric material 7 is placed. 'By this, the volume of the light emitting element 2 can be set as follows: the dielectric constant of the dielectric is reduced proportionally (that is, the "after" of the radiating element 2 is reduced), and then the groove shape is adjusted by The shape of the crotch 6 is compensated; ^ The bandwidth lost by the addition of the dielectric material 70 to the piece 2. 15 Furthermore, 'as shown in Figure 14', this embodiment can be further advanced in the dielectric A layer of metal 71 is locally arranged on the surface of the material 70 to change the directionality of the ^ = two electromagnetic fields, so that the electromagnetic radiation generated by the trough-shaped radiating portion 6 is more concentrated, which can reduce the SAR value and improve its light emission efficiency. FIG. 15 shows a second preferred embodiment of the low-side high antenna of the present invention. The only difference from the first embodiment is that the radiating element 5 is not a patch, but a monopole antenna. (Then Ze Qing * is called, one end is provided with a ground point 51 electrically connected to the ground plane 3, and an appropriate distance from the ground point 51 A feeding point 52 is provided there, and the feeding portion 31 on the ground plane 3 is electrically connected to form a piFA, and the reduction caused by the groove-shaped radiation portion 6 'formed on the ground plane 3 can be compensated. The bandwidth lost by the height of the radiating element 5 and the various benefits achieved by the radiating element 5 brought by the slot-shaped radiating portion 6 as described above. In summary, the present invention uses a ground plane on the low-side high antenna 丨In addition to forming a slot-shaped radiating portion 6 'on 3, in addition to forming a slot-shaped antenna capable of generating resonance in a low frequency band (900 MHz), the slot-shaped radiating portion 6 can also be used to compensate a radiating element acting in a high frequency band (1900 MHz). 20 200537746 lost due to lowering the height of 2,5. Moreover, the high- and low-band antennas of the low-side high antenna 1 are respectively shaped as separate elements (that is, the radiating elements 2, 5 and the ground plane). The groove of 3 " Tian She 邛 6) is used to prevent the radiating elements 2, 5 and the groove-shaped radiating portion 6 from affecting the resonance of each other due to the adjustment of their respective structures; The radiating part 6 is covered with a dielectric material, and the slot-shaped radiation # 6 is adjusted appropriately so as not to affect the image. In the case of the radiating element 2 and 5 bandwidth, the height of the radiating element # 2 and 5 is further reduced, so that it can meet the requirements of the low side height. In addition, it can also be arranged locally on the surface of the dielectric ㈣50-layer gold $ 52 to improve the directivity of the trough-shaped radiating section 6
’使槽狀輻射部6之輻射效能更形提升，並降低其SAR 值0 隹乂上所述者’僅為本發明之較佳實施例而已’當 不=以此限定本發明實施之範圍，即大凡依本發明申請專 利範圍及發明說明書内容所作之簡單的等效變化與修倚， 15皆應仍屬本發明專利涵蓋之範圍内。 【囷式簡單說明】 .圖1 I習知-種無接地微帶線平板天線之構造示意、# 之構造示意圖； 一較佳實施例之構 圖2是習知一種有接地微帶線天線 2〇 圖3是本發明之低側高天線的第 造示意圖； 圖4是第一實施例的另一實施態樣； 圖5是第一實施例之輻射元件的一變化例； 圖6是第一實施例之槽狀輻射部的一變化例，· 12 200537746 圖7是第一實施例之槽狀輻射部的 、J力一變化例； 圖8是第一實施例之槽狀輻射部的 勺又一變化例； 圖9是第一實施例之槽狀輻射部的 ^ 丹一變化例； 圖1 〇顯示第一實施例之槽狀輻鼾卹从 田射部作用時，在輻射 元件及接地面上的電流分佈情形； 圖11顯示第一實施例之輻射元件作困。士 u 1干1乍用時，在幸5射 件及接地面上的電流分佈情形； 田τ % 圖1 2顯示第一實施例之SWR量測結果； 10 材料； 圖13顯示在第一實施例之槽狀輻射部上覆蓋—八 ’丨電 圖14顯示在圖13所示之介電材料上局部地 層金屬；及 哪戍一 圖15是本發明低側高天線的第二較佳實施 示意圖。 1 j之構造 15'Enhance the radiation efficiency of the trough-shaped radiating portion 6 and reduce its SAR value 0. The above-mentioned' is only a preferred embodiment of the present invention '. When not = to limit the scope of implementation of the present invention, That is, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the invention description of the present invention shall still fall within the scope of the invention patent. [Brief description of the formula]. Figure 1 shows the structure of a conventional non-grounded microstrip flat-panel antenna, and # shows the structure of a preferred embodiment. Figure 2 shows a conventionally-known grounded microstrip antenna 2. 3 is a schematic diagram of a low-side high antenna of the present invention; FIG. 4 is another embodiment of the first embodiment; FIG. 5 is a modified example of a radiating element of the first embodiment; and FIG. 6 is a first embodiment A variation example of the slot-shaped radiating portion of the example, · 20052005746 Fig. 7 is a variation example of J force of the slot-shaped radiating portion of the first embodiment; Fig. 8 is another example of the slot-shaped radiating portion of the first embodiment; Modified Example; Figure 9 is a modified example of the slot-shaped radiating portion of the first embodiment; Figure 10 shows the slot-shaped radial shirt of the first embodiment when acting from the field-radiating portion, on the radiating element and the ground plane FIG. 11 shows the radiating element of the first embodiment is trapped. When U1 is used for the first time, the current distribution on the 5th part and the ground plane is used; τ τ% Figure 12 shows the SWR measurement results of the first embodiment; 10 materials; Figure 13 shows the first implementation Example of covering on a trough-shaped radiating part—Electroelectric Figure 14 shows a partial layer of metal on the dielectric material shown in FIG. 13; and FIG. 15 is a schematic diagram of the second preferred embodiment of the low-side high antenna of the present invention . 1 j structure 15
13 200537746 【圖式之主要元件代表符號說明】 1、5 低側高天線 2、4 輻射元件 3 接地面 6 槽狀輻射部 20、40輻射面 21饋入點 5 2 2接地點 23槽道 24彎折部 30絕緣基板 31饋入部 3 3側邊 70介電材料 71金屬 61第一端 62第二端 10 63、64槽道 65第一支臂 66第二支臂 67第三支臂 1413 200537746 [Description of the main symbols of the drawings] 1. 5 Low-side high antenna 2. 4 Radiating element 3 Ground plane 6 Slot-shaped radiating part 20, 40 Radiation plane 21 Feed point 5 2 2 Ground point 23 Slot 24 Bend portion 30 Insulating substrate 31 Feed portion 3 3 Side 70 Dielectric material 71 Metal 61 First end 62 Second end 10 63, 64 Channel 65 First arm 66 Second arm 67 Third arm 14