201019537 六、發明說明： 【發明所屬之技術領域】 本發明係有關一種天線’特別是一種可伸縮的環形天線。 【先前技術】 參 ❹ 隨著科技的進步，無線通訊系統的發展帶來生活上諸多便利。其中， 無線通訊系統的重要元件之-便是天線。將天線裝設於無線通訊裝置上， 發射器將電壓或電流信·換為缝_，藉由天_無線信號以輕射形 式在空中傳播m錄也可接收空中的無線信號，轉換為電壓或 電流後再經由無線通訊裝置進行處理，以達到無線傳輸的目的。 由於，無線通訊的發展使得手持行動裝，例如：行動電話細碰 ph 一、個人數位助理陶或智慧型手機(咖ph〇ne)等皆為現代人帶 來生活上的便利性，而手持行動裝置的收訊好壞與天線有著密不可分的關 係。由於，天線為傳送與接收電磁波的窗口，係為收發無線訊號的重要裝 置’因此天線設計的好壞，關係到無線通訊裝置的傳輸效能。 …、而隨者電子產品逐輸向輕薄化與微型化的聰邁輯，手 ==㈣猶㈣^㈣梅置㈣輪，同時 ^、嫩置巾的场’所分_之佈糊較侧。在手持行 裳置内部铜”，所_她瓣 天線效率秘，細料軌品質。 _而使得 【發明内容】 有鐘於此本發明提出一種環形天線，且該環形天線為可伸縮式。當本 201019537 發明所提出之環形天線裝設於手持行動裝置内，可將環形天線利用伸縮的 方式來提高天線效率’如此可改善手持裝置日益縮小的天線空間而對收訊 所造成的影響。 . 本伽提出i環形天線，包含：基板、第-輕射部、第—連接部、 .第二連接部及第二輻射部^基板具有第—表面與第二表面且第一表面上 具有接地面。第-賴射部一端設置於第一表面且鄰近該端之基板具有饋入 點，另-端設置於第二表面，而形成環形。第―連接部具有第—端與第二 β端，第-端設置於第-表面且耗接於接地面。第二連接部具有第三端與第 四端，第三麟置於第二表面且經由基板_於第—輻射部。第二輕射部 係以滑動方式設置於第-連接部之第二端與第二連接部之第四端之間，用 以調整與第-輻射部所形成之環形輻射路徑。 本發明亦提出—種環形天線，包含：基板、第—娜卩、第—連接部、 第二連接部、第二輻射部、匹配電路。基板具有第_表面與第二表面與饋 人點。第-輻射部-端設置於第一表面且另一端設置於第二表面而形成 ®環形連接部具有第—端與第二端，第—端設置於第—表面且經由基 板而接地。第二連接部具有第三端與第四端.，第三端設置於第二表面且經 ' *基板耦接於第一輻射部。第二輻射部係以滑動方式設置於第一連接部之 第-端與第二連接部之第四端之間’用以調整與第一輕射部所形成之環形 輕射路徑。匹配電_接於第一輻射部，用以匹配第一輕射部與第二輕射 部。 有關本發_健實施淑其魏，合圖式說明如後。 【實施方式】 201019537 請同時參照「第1A圖」為環形天線之第-實施例示意圖㈠，與「第 1C圖」為環形天線之第—實施_關。本發賴提&之環形天線包含： 一第一輻射部10、一第二輻射部20、一基板3〇、一第一連接部40、一第 二連接部50。 .基板30具有—第—表面32與一第二表面34。其中，基板30可為手持 行動裝置’例如：行動電話、個人數位助理或智慧型手機等之印刷電路板 (PCB)。第-輕射部1〇 一端設置於第―表φ 32，且位於該端附近的基板3〇 ❷上具有饋入點(如「第2Α圖」中所示），而另一端設置於第二表面34。由「第 1Α圖」中所不可知’第一輕射部1〇於基板3〇的第一表面％與第二表面 34之卿成獅，且第_輻射部1()為固定的設置於基板，因此第一賴 射部10屬於固定式環型輻射部。 由「第1C圖」中所示可知，第一連接部4〇具有一第一端射與一第二 端42，其中第-端41設置於第一表面32且位於第一端41的第一表面32 上具有接地面(圖中未示），使第一端41猶於接地面。第二連接部5〇具有 碜-第三端51與-第四端52，第三端51設置於第二表面％且麵接於第一輻 射P 10其中第連接部40可採用彈性頂針加职㈣的設計方式，使 第-連接部40耦接第二輻射部2〇之處(亦即第二端42)為頂針，如此可讓 .第二輻射部20與第-連接部4〇藉由頂針而電性導通。同樣的，第二連接 部50也可_彈性頂針的設計方式，使第二連接部％麵接第二輕射㈣ 之處(亦即第四端功為頂針，如此可讓第二輕射部2〇與第二連接部5〇藉 由頂針而電性導通。 第二輻射部20係以滑動方式設置於第—連接部4〇之第二端幻與第二 201019537 連接部50之第四端52之間。由「第1A圖」中所示可知，第二輕射邱 可在第一連接部40與第二連接部50之間伸縮滑動，因此相對於第—輻射 部20屬於固定式環型輻射部，而第二輻射部20便屬於移動式環型輻射部。 請同時參照「第1A圖」與「第1B圖」，由兩圖比較可知，「第ia圖」 • 為第二輻射部20伸縮之前的環形天線示意圖，而「第1B圖」為第二輻射 部20伸縮之後的環形天線示意圖。於此，第二輻射部2〇與第一輻射部⑴ 兩者可共同形成整體環形天線之環形輻射路徑，而藉由滑動第二輻射部2〇 β 可用以調整環形輻射路徑。如「第1Α圖」拉伸之前的環形天線，其環形輻 射路徑較短，而「第1Β圖」拉伸之後的環形天線，其環形轄射路徑較長。 上述之第二輻射部20可包含:一支撐件22與_軟性印刷電路板(五 Printed circuit ·贼)24。支撐件22由非金屬導體的材質所構成。相對的， 軟性印刷電路板24由金屬導體的材質所構成。如「第1A圖」中所示，軟 性印刷電路板24貼附於支撐件22靠近第一連接部4〇與第二連接部％之 1自於支標件22並非導體為單純用以支樓軟性印刷電路板24,因此即 參使軟性印刷電路板24貼附於支律件22，兩者也不會產生訊號的干擾。 天線的特性中，當輻射部的電氣長度越長，所產生的天線效能會越好， -但由於天線職設㈣絲置之帥械，耻無法紐的減輻射部之 -電氣長度。因此’本發明提出第-轄射部10與第二輕射部20的電氣長度 其最佳者至少為1/4波長(λ)。 請參…第2Α圖」’該圖所不為環形天線之第二實施例示意圖(一）。於 實彳中更包含匹配電路，於此匹配電路可包含一第一匹配單元62 與一第二匹配單元科^ 201019537 首先，簡單說明匹配(match)之功用。每一天線皆具有其工作頻率點， 舉例說明’假設天線的理想工作頻率點為2.4GHz，但有時天線實際產生的 工作頻率點位在2.35GHz或2.45GHz等’此時偏離正常工作頻率點2 4GHz 的2.35GHz或2_45GHz即為頻偏點。而匹配電路便可用以修正頻偏點，使 頻偏點可調整回所需的正常工作頻率點。於此，第一匹配單元位與第二匹 配單元64可由電容或電感等元件所組成，其中電容可將工作頻率往高頻方 向調整而電感可將工作專往低頻方向調整。此外，匹配電路也具有使環 〇 形天線可達到50歐姆阻抗匹配的功用。 於此，第一匹配單元62設置於基板3〇，耦接至基板3〇上之饋入點， 用以匹配第-輕射部1()與第二輻射部2G。第二匹配單元糾設置於第二輕 射部20的軟性印刷電路板24上，當環形輻射路徑為最大時(亦即第二轄射 口P2〇 /月動拉伸至最大時)，第二匹配單元Μ與第一匹配單元&共同匹配第 一輻射部10與第二輻射部20。 第匹配單70 62肖來匹配尚未拉丨的第二輻射部2〇與第一輕射部1〇 φ所組成的拉伸前之環形天線。請續參照「第2A圖」，第二轄射部2〇尚未拉 出，其所形成拉伸前環形天線的環形輕射路徑，圖中以虛騎製其訊號流 向首先訊號由饋入點流向第一匹配單元π，之後沿著帛一輕射部川由 第表面32流到第二表面34，再藉由第二連接部％流向第二輕射部加， 此時由於第一轄射部2〇尚未拉出因此訊號不會流經第二匹配單元私，而 著第轄射》p 20流往第一表面32,最後流向第一連接部4〇而接地， 完成拉伸前環形天線的第一操作頻率的環形輻射路徑。 由上述說明可4d，办哲- 嘗第二輻射部20尚未拉出時，訊號所流經的環形輻 201019537 射路徑僅會經過第-匹配單元62，因此當環形天線拉伸前，是由第一匹配 單元62來執行匹配的動作。 請參照「第2B圖」為環形天線之第二實施例示意圖㈡。第二匹配單 元64用來匹配第二輻射部2〇拉出後，第二輕射部2〇與第一轄射部1〇所 级成的環形天線。「第：圖」中第二輻射部20已拉出，此時第一輻射部 10與第二輻射部20所形成之環形天線的環形輻射路徑，同樣以虛線缚製其 訊號流向。首先，訊號由饋入點流向第一匹配單元纪，之後沿著第—輕射 ❹部10由第一表面32流到第二表面％藉由第二連接部％流向第二轄射部 20此時由於第一輻射部2〇已拉出，因此訊號會流經第二匹配單元糾，再 /CI著第一輻射流往第-表面32，最後流向第—連接部4()而接地，完 成拉伸後環形天線的第二操作頻率的環形輕射路徑。 述說月可知’ ^第二輻射部2〇拉出後’訊號所流經的環形輻射路 私會同時經過第-匹配單元62與第二匹配單元64，因此當環形天線伸縮 後’會由第-腿單元62與第二匹配單元Μ共同來執行㈣的動作。 ^ 請同時參照「第3A圖」與「第3B圖」分別為獅天線延展前與延展 後’ S11反射係數之頻率響應圖。於此所稱之延展前與延展後，即為第二輪 申縮别與伸縮後。「第Μ圖」以環形天線延展前，獅輕射路徑為 • 13.7公分為例’所得之實驗圖形，且假設所需的工作鮮為2.442GHz。由 第3A圖」右上角可看出實驗所得之數據為：在2.442GHz，環形天線測 得-12.36 dB。相料沾Γ 了的，第3Β圖」以環形天線延展後，環形輻射路徑為26 么刀為例’所得之實驗圖形，同樣假設所需的工作頻率為2.442GHz。由「第 3B囷」右上角可看出實驗所得之數據為 :在 2_442GHz，天線測得·15 89 dfi » 201019537 由此可知，當環形天線經延展後可得到較佳之dfi值。 」的條件’實驗所得之天線效 ’而當環敍線蝴後的天線 藉由本發明所提出之可伸縮式的 此外，同樣以「第3A囷」與「第3B圖」 率’當環形天線延展前之天線效率為81 〇7%， 效率提升為92.42%。由此，可清楚得知，藉逢 -環形天線，可在手持裝置日益縮小的空間内用以提升天線效率。 雖然本發明的技術内容已經以較佳實施例揭露如上然其並非用以限 定本發明’任何熟習此技藝者，在不脫離本發明之精神所作些許之更動與 鲁 潤飾，皆應涵蓋於本發明的範疇内，因此本發明之保護範圍當視後附之申 請專利範圍所界定者為準。 【圖式簡單說明】 第1A圖：環形天線之第一實施例不意圖(一） 第1B圖：環形天線之第一實施例示意圖(二） 第1C圖··環形天線之第一實施例剖面圖 第2A圖：環形天線之第二實施例示意圖(一） β 第2Β圖：環形天線之第二實施例示意圖(二） 第3Α圖：環形天線延展前S11反射係數之頻率響應圖 * 第3Β圖：環形天線延展後S11反射係數之頻率響應圖 【主要元件符號說明】 10 :第一輻射部 20 :第二輻射部 22 :支撐件 24 :軟性印刷電路板 201019537 參 :基板 :第一表面 :第二表面 :第一連接部 :第一端 :第二端 :第二連接部 :第三端 :第四端 :第一匹配單元 :第二匹配單元201019537 VI. Description of the Invention: [Technical Field] The present invention relates to an antenna', particularly a retractable loop antenna. [Prior Art] Participation With the advancement of technology, the development of wireless communication systems has brought many conveniences in life. Among them, the important component of the wireless communication system is the antenna. The antenna is installed on the wireless communication device, and the transmitter converts the voltage or current signal into a slit_, and the wireless signal can be transmitted in the air by the sky_wireless signal in the form of light radiation, and can also receive the wireless signal in the air and convert it into voltage or The current is then processed by the wireless communication device to achieve the purpose of wireless transmission. Because of the development of wireless communication, handheld mobile devices, such as mobile phone touch, personal digital assistant or smart phone, bring convenience to modern people, while handheld action The reception of the device is inextricably linked to the antenna. Since the antenna is a window for transmitting and receiving electromagnetic waves, it is an important device for transmitting and receiving wireless signals. Therefore, the design of the antenna is related to the transmission performance of the wireless communication device. ..., and the electronic products of the follow-up to the light and thin and miniaturized Congmai series, hand == (four) Jewish (four) ^ (four) Mei set (four) round, while the ^, the tender place of the towel 'point _ the paste side . In the hand-held line, the internal copper is placed, the efficiency of the antenna of the valve is secret, and the quality of the fine track is _. [Inventive content] There is a loop antenna provided by the present invention, and the loop antenna is telescopic. The loop antenna proposed by the invention of 201019537 is installed in a handheld mobile device, and the loop antenna can be used to improve the antenna efficiency by using a telescopic method. This can improve the impact of the shrinking antenna space of the handheld device on the receiving. The gamma-providing i-ring antenna comprises: a substrate, a first light-emitting portion, a first connecting portion, a second connecting portion and a second radiating portion, the substrate having a first surface and a second surface and having a ground plane on the first surface. The first portion of the first portion is disposed on the first surface, and the substrate adjacent to the end has a feeding point, and the other end is disposed on the second surface to form a ring shape. The first connecting portion has a first end and a second end β, The second end is disposed on the first surface and is connected to the grounding surface. The second connecting portion has a third end and a fourth end, and the third end is disposed on the second surface and passes through the substrate_the first radiating portion. Set in a sliding manner And disposed between the second end of the first connecting portion and the fourth end of the second connecting portion for adjusting the annular radiation path formed by the first radiating portion. The present invention also provides a loop antenna, including: a substrate, a first surface, a second connecting portion, a second radiating portion, and a matching circuit. The substrate has a first surface and a second surface and a feeding point. The first radiating portion is disposed on the first surface and the other One end is disposed on the second surface to form a ring-shaped connecting portion having a first end and a second end, the first end is disposed on the first surface and grounded via the substrate. The second connecting portion has a third end and a fourth end. The three ends are disposed on the second surface and coupled to the first radiating portion via the '* substrate. The second radiating portion is disposed in a sliding manner between the first end of the first connecting portion and the fourth end of the second connecting portion. The method is configured to adjust an annular light path formed by the first light-emitting portion, and the matching electrode is connected to the first radiation portion for matching the first light-emitting portion and the second light-emitting portion. Wei, the description of the figure is as follows. [Embodiment] 201019537 Please also refer to "1A" "For the first loop antenna - A schematic embodiment of embodiment (i), and" Fig. 1C "is a loop antenna of a first - embodiment _ off. The ring antenna of the present invention comprises: a first radiating portion 10, a second radiating portion 20, a substrate 3A, a first connecting portion 40, and a second connecting portion 50. The substrate 30 has a first surface 32 and a second surface 34. The substrate 30 can be a printed circuit board (PCB) of a handheld mobile device such as a mobile phone, a personal digital assistant or a smart phone. One end of the first light-lighting portion is disposed at the first table φ 32, and the substrate 3 located near the end has a feeding point (as shown in the "second drawing"), and the other end is disposed at the Two surfaces 34. It is unknown from the "1st map" that the first light-emitting portion 1 is on the first surface % of the substrate 3 and the second surface 34 is formed into a lion, and the first radiation portion 1 () is fixedly disposed on The substrate, therefore, the first radiation portion 10 belongs to a fixed ring type radiation portion. As shown in FIG. 1C, the first connecting portion 4 has a first end and a second end 42. The first end 41 is disposed on the first surface 32 and is located at the first end 41. The surface 32 has a ground plane (not shown) such that the first end 41 is still at the ground plane. The second connecting portion 5 has a 碜-third end 51 and a fourth end 52. The third end 51 is disposed on the second surface % and is in contact with the first radiation P 10 , wherein the connecting portion 40 can be used for the elastic thimble. (4) The design of the second connecting portion 40 is coupled to the second radiating portion 2 (ie, the second end 42) as a thimble, so that the second radiating portion 20 and the first connecting portion 4 The thimble is electrically conductive. Similarly, the second connecting portion 50 can also be configured in such a manner that the second connecting portion is connected to the second light (4) (that is, the fourth end is a thimble, so that the second light portion can be made. 2〇 and the second connecting portion 5〇 are electrically connected by the ejector pin. The second radiating portion 20 is slidably disposed at the second end of the first connecting portion 4〇 and the fourth end of the second connecting portion 50 of the 201019537 Between the two, as shown in the "Fig. 1A", the second light projecting can be stretched and slid between the first connecting portion 40 and the second connecting portion 50, so that it is a fixed ring with respect to the first radiating portion 20. The type of radiation part, and the second radiation part 20 belongs to the mobile ring type radiation part. Please refer to "1A" and "1B" at the same time. It can be seen from the comparison of the two figures that "the ia diagram" is the second radiation. FIG. 1B is a schematic diagram of a loop antenna after the second radiating portion 20 is stretched and contracted. Here, the second radiating portion 2〇 and the first radiating portion (1) can form a whole ring together. An annular radiation path of the antenna, and the second radiation portion 2 〇β can be used to adjust the ring The radiation path, such as the loop antenna before the stretching of the "1st map", has a short annular radiation path, and the loop antenna after the stretching of the "1st map" has a longer circular path. The second radiating portion is described above. 20 may include: a support member 22 and a flexible printed circuit board (five printed circuit board) 24. The support member 22 is made of a material of a non-metallic conductor. In contrast, the flexible printed circuit board 24 is made of a material of a metal conductor. As shown in "1A", the flexible printed circuit board 24 is attached to the support member 22 near the first connecting portion 4 and the second connecting portion. The self-supporting member 22 is not a conductor. The flexible printed circuit board 24 is connected, so that the flexible printed circuit board 24 is attached to the branch member 22, and the two do not interfere with the signal. In the characteristics of the antenna, when the electrical length of the radiating portion is longer, the generated The better the antenna performance will be - but because the antenna is located in the antenna (4), the wire is placed in a handsome position, and the shame is not able to reduce the electrical length of the radiation. Therefore, the present invention proposes the first-radiation portion 10 and the second light-emitting portion 20 The electrical length is preferably at least 1/4 wavelength (λ). Please refer to the second embodiment of FIG. 2, which is not a schematic diagram of a second embodiment of a loop antenna. The matching circuit further includes a matching circuit, and the matching circuit can include a first matching unit 62 and a second Matching Units ^ 201019537 First, a brief description of the function of the match. Each antenna has its operating frequency point, for example, 'Assume that the ideal operating frequency of the antenna is 2.4 GHz, but sometimes the actual operating frequency of the antenna At 2.35 GHz or 2.45 GHz, etc., 2.35 GHz or 2_45 GHz deviating from the normal operating frequency point of 2 4 GHz is the frequency offset point. The matching circuit can be used to correct the frequency offset point so that the frequency offset point can be adjusted back to the required frequency. Normal operating frequency point. Herein, the first matching unit bit and the second matching unit 64 may be composed of components such as capacitors or inductors, wherein the capacitor can adjust the operating frequency to the high frequency direction and the inductor can adjust the operation to the low frequency direction. In addition, the matching circuit also has the function of achieving a 50 ohm impedance matching of the loop antenna. The first matching unit 62 is disposed on the substrate 3A and coupled to the feeding point on the substrate 3 to match the first-light portion 1() and the second radiation portion 2G. The second matching unit is arranged on the flexible printed circuit board 24 of the second light-emitting portion 20, when the annular radiation path is maximum (that is, when the second apex port P2/month is stretched to the maximum), the second The matching unit 共同 matches the first radiating portion 10 and the second radiating portion 20 in common with the first matching unit & The first matching unit 70 62 is matched with the loop antenna before stretching which is composed of the second radiating portion 2 尚未 which has not been pulled and the first light projecting portion 1 φ φ. Please continue to refer to "Picture 2A". The second illuminating part 2〇 has not been pulled out, and the circular light path of the loop antenna before stretching is formed. In the figure, the signal is flown by the virtual ride to the first signal from the feed point. The first matching unit π is then flowed from the first surface 32 to the second surface 34 along the first light-emitting portion, and then flows to the second light-emitting portion by the second connecting portion %, at this time due to the first illuminating portion 2〇 has not been pulled out so the signal will not flow through the second matching unit privately, and the first pulsing "p 20" flows to the first surface 32, and finally flows to the first connecting portion 4〇 and is grounded, completing the stretching of the front loop antenna An annular radiation path of the first operating frequency. From the above description, it can be 4d that, when the second radiating portion 20 has not been pulled out, the annular spoke 201019537 path through which the signal flows will only pass through the first matching unit 62, so that when the loop antenna is stretched, it is A matching unit 62 performs the matching action. Please refer to "FIG. 2B" as a schematic diagram (2) of the second embodiment of the loop antenna. The second matching unit 64 is adapted to match the loop antenna of the second light-emitting portion 2A and the first illuminating portion 1A after the second radiating portion 2 is pulled out. In the "figure: Fig.", the second radiating portion 20 has been pulled out. At this time, the annular radiating path of the loop antenna formed by the first radiating portion 10 and the second radiating portion 20 is also tied with its signal flow direction by a broken line. First, the signal flows from the feeding point to the first matching unit, and then flows from the first surface 32 to the second surface along the first light-emitting portion 10, and flows to the second urging portion 20 through the second connecting portion %. Since the first radiating portion 2〇 has been pulled out, the signal will flow through the second matching unit to correct, and the /CI first radiation flows to the first surface 32, and finally flows to the first connecting portion 4 () to be grounded. An annular light path of the second operating frequency of the loop antenna after stretching. It can be known that the end of the ring radiation path through which the signal is transmitted by the second radiating portion 2 is simultaneously passed through the first matching unit 62 and the second matching unit 64, so that when the loop antenna is stretched, it will be The leg unit 62 cooperates with the second matching unit 执行 to perform the action of (4). ^ Please also refer to "3A" and "3B" for the frequency response of the S11 reflection coefficient before and after the extension of the lion antenna. Before and after the extension, it is the second round of contraction and expansion. Before the extension of the loop antenna, the lion's light path was an experimental plot of 13.7 cm, and the required work was 2.42 GHz. From the upper right corner of Figure 3A, the experimental data is: at 2.442 GHz, the loop antenna measured -12.36 dB. The experimental data obtained by the observation of the loop antenna after the loop antenna is extended by the ring antenna is as follows. The same experimental frequency is assumed to be 2.442 GHz. From the upper right corner of "3B囷", the data obtained from the experiment is as follows: at 2_442 GHz, the antenna measured · 15 89 dfi » 201019537 It can be seen that when the loop antenna is extended, a better dfi value can be obtained. The condition of the 'antenna effect obtained from the experiment' and the antenna after the ring-shaped butterfly is retractable by the present invention, and the "3A" and "3B" rates are also used as the loop antenna extension. The former antenna efficiency was 81 〇 7%, and the efficiency was increased to 92.42%. Thus, it can be clearly seen that the loop antenna can be used to increase the antenna efficiency in a space where the handheld device is shrinking. Although the technical content of the present invention has been disclosed in the preferred embodiments as described above, it is not intended to limit the invention to those skilled in the art, and some modifications and simplifications may be made without departing from the spirit of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a view showing a first embodiment of a loop antenna. FIG. 1B is a schematic view showing a first embodiment of a loop antenna. FIG. 1C is a cross-sectional view showing a first embodiment of the loop antenna. Figure 2A: Schematic diagram of a second embodiment of a loop antenna (1) β Figure 2: Schematic diagram of a second embodiment of a loop antenna (2) Figure 3: Frequency response of the S11 reflection coefficient before the loop antenna is extended * 3 Fig.: Frequency response diagram of the S11 reflection coefficient after the loop antenna is extended [Description of main component symbols] 10: First radiating portion 20: Second radiating portion 22: Support member 24: Flexible printed circuit board 201019537 Reference: Substrate: First surface: Second surface: first connecting portion: first end: second end: second connecting portion: third end: fourth end: first matching unit: second matching unit