201234709 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種平板電腦裝置（tablet computer device)，特別是具有雙寬頻迴圈天線達成低人體特定吸收 比率（body SAR，body specific absorption rate)之平板電腦 裝置。 【先前技術】 隨著無線通訊技術的快速發展，已促使長期演進(LTE， Long Term Evolution)行動通訊技術的誕生，代表著應用於 行動通訊裝置之天線將需要涵蓋更寬的頻寬，例如704〜 960 MHz 及 1710 〜2690 MHz 來涵蓋 LTE700/2300/2500 三 頻操作及無線廣域網路（WWAN，Wireless Wide Area Network)五頻操作。此時’要同時兼顧LTE/WWAN八頻操 作以及天線體積縮小化成為天線設計上之一大挑戰。目前 傳統行動通訊裝置天線之操作頻寬，大多無法同時滿足 LTE/WWAN八頻操作之所需，例如台灣專利公告號第 1295517 5虎一種内藏式多頻天線”，揭示一種輕合式饋入 之多頻行動通訊裝置’其操作頻帶僅可涵蓋 GSM900/1800/1900/UMTS四頻操作，無法滿足所需之 LTE/WWAN之八頻操作。 此外’當天線應用於平板電腦裝置時，由於天線之人 體特定吸收比率必須低於1.6 W/kg (1克人體組織標準）， 因此天線必須具有低近場輕射場量。而目前傳統應用於平 201234709 板電腦裝置之天線較難通過此規範要求。 【發明内容】 為了解決上述先前技術之問題，本發明提出一種平板 電腦裝置，其天線適用於LTE/WWAN之八頻操作，同時具 有縮小化之尺寸’且可滿足天線之人體特定吸收比率的規 範要求。 本發明之平板電腦裝置包含一接地面及一天線。天線 鲁位於介質基板上’天線並包含第一輕射部及第二輕射部， 第一輻射部之一端為天線之饋入點，第一轄射部之共振長 度至少為天線最高操作頻率之四分之一波長，第二輕射部 包圍第一輻射部’第二輻射部的兩端點均電氣連接至接地 面上，並分別位於饋入點的兩側，且第二輻射部與第一輕 射部具有耦合區間’在耦合區間内具有耦合間距，柄合間 距少於3mm’且在此耦合區間，第二輻射部具有一電威元 件。 鲁 本發明平板電腦裝置之天線可以產生兩個寬頻操作頻 帶，在6 dB返回損失的定義之下，第一操作頻帶足以涵蓋 LTE700/GSM850/900 (704 〜960 MHz)三頻操作或 GSM850/900 (824〜960 MHz)二頻操作，第二操作頻帶足 以涵蓋 GSM1800/1900/UMTS/LTE2300/2500 (1710 〜269q MHz)五頻操作或 GSM1800/1900/UMTS (1710 〜2170 MHz) 三頻操作。在本發明中，天線並為一平面結構，以印刷咬 蝕刻技術形成於介質基板之一表面上，第一輻射部本質上 201234709 為一早極天線，其二臂可不等長，第一輻射部不僅為輕射 部，且為天線之饋入部，其在天線的第二操作頻帶產生妓 振模態，增加第二操作模態的操作頻寬。第二輕射部形成、 封閉迴路，其長度帛近天線最低操作頻率之二分之一波 長可以產生位於天線之第-操作頻帶内之一共振模態， 當加上在搞合區間内之電感元件時，電感元件可以與在麵 口區Η之等效電今產生LC共振’而在第一操作頻帶内產 生4一額外共振模態，與原先之共振模態結合，使天線足以 #涵蓋LTE7〇〇/GSM85〇/_三頻操作或GSM85〇觸二頻操 作’且由於第二輻射部沒有開口端，亦即本質上沒有零電 流點’而由於在零電流處，天線會產生強電場近場場量， 因此相較於一般具有開口端之天線，天線預期可以產生較 低之電場近場場量，達魏人體収糾比率的需求。 【實施方式】 第1圖為本發明之第一實施例】之結構圖。第一實施 例1包含一接地面10及一天線11，該天線u位於一介質 基板12上，該天線包含：一第一輻射部13，其一端為該 天線之饋人點13卜該第—輻射部13之共振長度至少為該 天線最高操作頻率之四分之一波長；及一第二輕射部^ 該第二_部14包圍該第—輕射部13,且其二端點⑷ 及142均短路至該接地面1〇，並分別位於該天線u之饋 入點131之兩側，該第二輕射部14之長度至少為該第一幸。 射部13之共振長度的兩倍，該第二輕射部14與該第一^ 201234709 射部 15， 16。 13並具有—搞合區間，在㈣合區間具有—耗合間距 且在該耦合區間’該第二輻射部14具有一電感元件201234709 VI. Description of the Invention: [Technical Field] The present invention relates to a tablet computer device, in particular to a double wideband loop antenna to achieve a body specific absorption rate (body SAR) Tablet device. [Prior Art] With the rapid development of wireless communication technology, the Long Term Evolution (LTE) mobile communication technology has been promoted, and the antenna used in mobile communication devices will need to cover a wider bandwidth, such as 704. ~ 960 MHz and 1710 ~ 2690 MHz to cover LTE700/2300/2500 tri-band operation and wireless wide area network (WWAN, Wireless Wide Area Network) five-frequency operation. At this time, it is a big challenge in antenna design to simultaneously consider the LTE/WWAN eight-frequency operation and the reduction of the antenna size. At present, the operating bandwidth of conventional mobile communication device antennas cannot meet the requirements of LTE/WWAN eight-frequency operation at the same time. For example, Taiwan Patent Publication No. 1295517 5 Tiger is a built-in multi-frequency antenna, which reveals a light-weight feed. The multi-frequency mobile communication device's operating band can only cover GSM900/1800/1900/UMTS four-frequency operation, which can not meet the required LTE/WWAN eight-frequency operation. In addition, when the antenna is applied to a tablet device, the antenna is the human body. The specific absorption ratio must be lower than 1.6 W/kg (1 gram of human tissue standard), so the antenna must have a low near-field light field. However, the antenna that is conventionally applied to the flat 201234709 computer device is difficult to pass the requirements of this specification. In order to solve the above problems of the prior art, the present invention proposes a tablet computer device whose antenna is suitable for LTE/WWAN eight-frequency operation, and has a reduced size 'and can meet the specification requirements of the antenna specific absorption ratio of the antenna. The tablet device of the present invention comprises a ground plane and an antenna. The antenna is located on the dielectric substrate and the antenna is packaged. The first light-emitting portion and the second light-emitting portion, one end of the first radiating portion is a feeding point of the antenna, and the resonant length of the first illuminating portion is at least a quarter wavelength of the highest operating frequency of the antenna, and the second light shot The two ends of the second radiating portion surrounding the first radiating portion are electrically connected to the ground plane, and are respectively located at two sides of the feeding point, and the second radiating portion and the first light portion have a coupling interval 'coupling There is a coupling pitch in the interval, and the shank spacing is less than 3 mm'. In this coupling interval, the second radiating portion has a telecommunications component. The antenna of the invention tablet device can generate two broadband operating bands at a return loss of 6 dB. By definition, the first operating band is sufficient to cover LTE700/GSM850/900 (704 to 960 MHz) tri-band operation or GSM850/900 (824 to 960 MHz) two-band operation, and the second operating band is sufficient to cover GSM1800/1900/UMTS /LTE2300/2500 (1710 ~ 269q MHz) five-frequency operation or GSM1800/1900/UMTS (1710 ~ 2170 MHz) tri-band operation. In the present invention, the antenna is a planar structure formed by a bite etching technique on a dielectric substrate On one surface, In essence, 201234709 is an early-pole antenna, and the two arms can be unequal in length. The first radiating portion is not only a light-emitting portion but also a feeding portion of the antenna, which generates a vibration mode in the second operating band of the antenna, increasing The operating bandwidth of the second operational mode. The second light-emitting portion forms a closed loop whose length is close to one-half of the lowest operating frequency of the antenna and can generate a resonant mode in the first operational band of the antenna. When the inductive component in the fit interval is added, the inductive component can generate LC resonance with the equivalent current in the face region, and generate an additional resonant mode in the first operating band, and resonate with the original Modal combination, so that the antenna is sufficient to cover LTE7〇〇/GSM85〇/_tri-band operation or GSM85-touch two-frequency operation 'and because the second radiating portion has no open end, that is, there is essentially no zero current point' At zero current, the antenna will generate a strong electric field near-field field. Therefore, compared with the antenna with an open end, the antenna is expected to produce a lower electric field near-field quantity, which is required for the human body to collect the correction ratio. [Embodiment] Fig. 1 is a structural view showing a first embodiment of the present invention. The first embodiment includes a ground plane 10 and an antenna 11. The antenna u is located on a dielectric substrate 12. The antenna includes a first radiating portion 13 and one end of which is a feeding point of the antenna. The radiation portion 13 has a resonance length of at least a quarter wavelength of the highest operating frequency of the antenna; and a second light portion ^ the second portion 14 surrounds the first light portion 13 and has two end points (4) and 142 are short-circuited to the ground plane 1 〇 and are respectively located at two sides of the feeding point 131 of the antenna u. The length of the second light-emitting portion 14 is at least the first. The second light-emitting portion 14 and the first ^201234709 emitting portion 15, 16 are twice the resonance length of the emitting portion 13. 13 has a - engaging interval, has a - spacing in the (four) interval, and the second radiating portion 14 has an inductive component in the coupling interval
第2圖為本發明之第—實施例1之量測返回損失圖。 ^第-貫施例丨中選擇下列尺寸來進行實驗：接地面1〇長 度約為2〇0醜，寬度約為15〇咖：介質基板u選用長度 =75麵，寬度約為12麵，厚度約為"職之玻璃纖 :基板；第-輕射部12及第二_ 14印製於玻璃纖維 基板上；電感元件為-晶片電感，其電感值約1〇犯。如 ^ 2圖所示’第—實施例1可產生該第—操作頻帶21及該 第:操作頻帶22’在6dB返回損失的定義之下，第一操作 頻帶 21 足以涵蓋 LTE700/GSM850/900 (704 〜960 MHz)三 頻操作’第二操作頻帶22足以涵蓋GSMi_/i9〇〇舰ts/ LTE2300/2500 (1710 〜2690 MHz)五頻操作。 第3圖為本發明之第二實施例3之結構圖。第二實施 例3與第—實施例1之差異在於第二輕射部34之電感元件 由一分佈式電感元件36取代，分佈式電感元件36可以使 用印刷或姓刻技術形成於介質基板上，其亦可提供與一 般晶片電感相似之電感值，因此第二實施例3之操作原理 -、第貫把例1相同。藉由適度調整分佈式電感元件36之 尺寸即可達到與第一實施例1相似之結果，因此不再贅述。 第4圖為本發明之第三實施例4之結構圖。第三實施 例4與第一實施例1之差異在於第一輻射部43之饋入端之 寬度可漸進式加寬，以得到寬頻操作，且第二輻射部44可 201234709 具有多彎折，以縮小天線尺寸。第三實施例4之結構基本 上與第一實例1相似，因此亦可達成與第一實施例丨相似 之結果。 以上說明所述之實施例僅為說明本發明之原理及功 政而非限制本發明。即凡依本發明申請專利範圍所作之 變化與修飾’皆應仍屬本發明專利涵蓋之範圍内。 201234709 【圖式簡單說明】 第1圖為本發明之平板電腦裝置第一實施例之結構圖。 第2圖為本發明之平板電腦裝置第一實施例之天線返回損 失量測結果圖。 ' 第3圖為本發明之平板電腦裝置第二實施例之結構圖。 第4圖為本發明之平板電腦裝置第三實施例之結構圖。 【主要元件符號說明】 平板電腦裝置！、3、4 擊接地面1 〇 天線 1 1、3 1、41 介質基板12 第一輻射部 13、43 第一輕射部之—端（天線饋入點）13 1、43 1 第二輕射部14、34、44 第二輕射部之短路端141、142、341、342、441、442 鲁耦1合間距15、35、45 晶片電感16 天線第一頻帶2 j 天線第二頻帶22 分佈式電感元件36 8Fig. 2 is a graph showing the measurement return loss of the first embodiment of the present invention. ^In the first example, the following dimensions were selected for the experiment: the ground plane 1〇 is about 2〇0 ug, and the width is about 15 〇: the dielectric substrate u has a length of 75 faces, a width of about 12 faces, and a thickness. About the glass fiber of the job: the substrate; the first-light part 12 and the second _ 14 are printed on the glass fiber substrate; the inductance component is a chip inductor, and the inductance value is about 1 〇. As shown in Fig. 2, the first operation band 21 and the first: operation band 22' are under the definition of 6 dB return loss, and the first operation band 21 is sufficient to cover LTE700/GSM850/900 ( 704 to 960 MHz) Tri-band operation 'The second operating band 22 is sufficient to cover the GSMi_/i9 ts/ LTE 2300/2500 (1710 to 2690 MHz) five-frequency operation. Fig. 3 is a structural view showing a second embodiment of the present invention. The difference between the second embodiment 3 and the first embodiment is that the inductance component of the second light-emitting portion 34 is replaced by a distributed inductance component 36, and the distributed inductance component 36 can be formed on the dielectric substrate by using a printing or surname technique. It can also provide an inductance value similar to that of a general chip inductor, so the operation principle of the second embodiment 3 is the same as that of the example 1. The result similar to that of the first embodiment 1 can be achieved by appropriately adjusting the size of the distributed inductance element 36, and therefore will not be described again. Fig. 4 is a structural view showing a third embodiment of the present invention. The difference between the third embodiment 4 and the first embodiment 1 is that the width of the feeding end of the first radiating portion 43 can be gradually widened to obtain a wide frequency operation, and the second radiating portion 44 can have a plurality of bends at 201234709 to Reduce the size of the antenna. The structure of the third embodiment 4 is basically similar to that of the first example 1, and thus a result similar to that of the first embodiment can be achieved. The embodiments described above are merely illustrative of the principles and principles of the invention and are not intended to limit the invention. That is, variations and modifications made by the scope of the present invention should still be within the scope of the present invention. 201234709 [Simplified description of the drawings] Fig. 1 is a structural view showing a first embodiment of the tablet device of the present invention. Fig. 2 is a graph showing the results of the antenna return loss measurement of the first embodiment of the tablet computer device of the present invention. Fig. 3 is a structural view showing a second embodiment of the tablet device of the present invention. Fig. 4 is a structural view showing a third embodiment of the tablet device of the present invention. [Main component symbol description] Tablet device! 3, 4 hit ground plane 1 〇 antenna 1 1 , 3 1 , 41 dielectric substrate 12 first radiating portion 13 , 43 the first light-emitting portion - end (antenna feed point) 13 1 , 43 1 second light shot Ports 14, 34, 44 Short-circuit ends 141, 142, 341, 342, 441, 442 of the second light-emitting portion Lu-coupling 1 pitch 15, 35, 45 Chip inductance 16 Antenna first frequency band 2 j Antenna second frequency band 22 distribution Inductive component 36 8