M426892 五、新型說明： 【新型所屬之技術領域】 本創作係才曰種雙頻天線’尤指一種結合迴圈天線及平面隹4 F 型天線以收發雙頻無線訊號之雙頻天線。 【先前技術】 具有無線通訊魏的電子產品，如筆記型電腦、個人數位助理 (Pe麵al Digital Assistant)等’係透過天線來㈣或接收無線電 波，以傳遞或交換無、線電訊號，進而存取無線網路。因此，為了讓 使用者能更方便地存取無線軌網路，理想天線的頻寬應在許可範 圍内盡可能地增加’而尺寸職盡量減小，以配合電子產品體積縮 小之趨勢。 在習知技術中，迴圈天線（LoopAntenna)是一種在一平面上 繞成閉合曲線形狀的導電體，通常繞成圓形、方形、三角形等，箕 原理與偶極天線相似，亦為共振式天線。請參考第1A圖，第ία圖 為習知一迴圈天線10之示意圖。由第1A圖可知，迴圈天線10係 設置於x-y平面上之圓形環狀導電體，其具有薄型（L〇w pr0fiie) 的特點，可適用於電子產品體積縮小之趨勢，但是迴圈天線10在設 計上彈性較低且不易縮小尺寸。 另外一種常見的無線通訊天線係為平面倒F型天線（Planar M426892 -I— FAntenna，HFA)，顧名思義，其形狀類似於經過旋轉及翻 轉後之「F」。請參考第1B圖，第1B圖為習知_平面倒f型天線 12之示意圖。-般來說，平面則型天線12主要由一輕射元件⑽、 導電接腳122、124卩及-饋入元件126所組成。饋入元件126饋入 電流時可依獅種m種路線€流從饋人元件126流經導電 .接腳122及導電接腳124，最後返回一地端，而第二種路線Γ從饋 :入元件126流經導電接腳122，最後由輕射元件12〇以電磁波方式 #傳輸至-接收端。值得注意的，在第一種路線中，由於導電接腳m 及導電接腳124中的電流流向恰相反，因此不會譜振產生電磁波； 第-種路線中，電流流經的長度恰滿足四分之—的傳輸電磁波波 長，因此得以諧振產生電磁波。 平面倒F型天線對於具寬頻需求較大之無線通訊系統，如無線 區域網路（WirelessLocalAreaNetworks ’ WLAN)系統，其頻寬仍 不理想，進而限制其應用範圍，此，如何有效提高天線的頻寬， •已成為業界所努力的目標之一。 【新型内容】 因此，本創作之主要目的即在於提供一種雙頻天線。 本創作揭露一種雙頻天線，包含有—接地元件，電性連接於一 地端，-饋人元件，絲傳送—第―頻段及_第二頻段之無線訊號·， 一第一輻射疋件，用來收發該第一頻段之無線訊號，該第一輻射元 M426892 件包含有-第-分支，電性連接於該饋人元件；以及—第二分支， 連接於該第-分支；以及一第三分支，其一端電性連接於該第 一分支與該第二分支之交界處，另—端電性連接於該接地元件，該 第三分支與該第-分支形成天線，而成為—第二輻射元件， 以收發該第二頻段之無線訊號。 【實施方式】 凊參考第2目，第2圖為本創作實施例一雙頻天線2〇之示意 圖。雙頻天線20具有雙共振模態，其包含一接地元件2〇〇、一饋入 元件202、-第-輕射元件204及-第二輕射元件朋。接地元件 200電性連接於一地端。第一輻射元件2〇4類似於一平面倒f型天 線，其係由一第一分支2040及一第二分支2〇42所組成。而第二輻 射元件208係為一迴圈天線，其係由第一分支2〇4〇與一第三分支 206所組成。由此可知，第一輻射元件2〇4與第二輻射元件2〇8共 用第一分支2040。而饋入元件202電性連接於第一分支2〇4〇，用來 傳送或接收一第一頻段（低頻）及一第二頻段（高頻）之無線訊號。 因此，雙頻天線20可視為平面倒F型天線與迴圈天線的結合， 分別用來收發低頻及高頻無線訊號。詳細來說，第一輕射元件204 包含的第一分支2040及第二分支2042總長大致等於低頻無線訊號 的四分之一波長’用來收發低頻無線訊號。第二輻射元件2〇8包含 的第三分支206及第-分支2040總長大致等於高頻無軌號的 之一波長，用來收發高頻無線訊號。此外，藉由改變接地元件2〇〇 M426892 的尺寸大小、第三分支206和接地元件200的連接位置等參數，亦 可調整低頻無線訊號及高頻無線訊號的匹配條件，以適用於不同無 線傳輸糸統。同樣地’饋入元件202的設計和使用，皆為本領域且 通常知識者所熟知，在此不贅述。實際上，根據不同系統或使用者 的需求’本領域具通常知識者可依據本創作之雙頻天線2〇來進一步 調整第一輻射元件204、第二輻射元件208、饋入元件2〇2以及接地 元件200之尺寸、材質、位置等特性，以提高雙頻天線2〇的適用範 圍，而不限於此。 值得注意的’本創作之主要精神在於雙頻天線2〇除了透過第一 分支2040與第二分支2042構成平面倒F型天線的主要輻射體外， 同時利用第一分支2040與第三分支206形成迴圈天線，以増加操作 頻段，解決傳統上平面倒F型天線存在之頻寬不理想的問題，以適 用於具雙頻需求之無線通訊系統，如無線區域網路（WLan)系統。 除此之外，雙頻天線20各元件的形狀、材料皆未有所限。舉例來 說:在第2圖中，第—分支2_及第二分支綱2分別包含一彎折 而呈L型’而第三分支2〇6則是由第一分支獅與第二分支取2 之交界處垂直向接地元件延伸：細，秘概，只要確保第 -分支2G4G與第二分支2G42之電流路徑符合所需，且第—分支 2040與第三分支206可正確形成迴圈天線即可。 明參考第3圖’第3圖為本創作實施例一雙頻天線3〇之示音 圖°第3 _示之雙頻天線3G和第2圖所示之雙頻天線扣具有=目 7 M426892 似構造，詳細來說，雙頻天線3〇包含有一接地元件3〇〇、一饋入元 件302、-第-輕射元件3〇4、一第二輕射元件31〇及一匹配元件 308。接地元件300電性連接於一地端。第一輻射元件3〇4類似於一 平面倒F型天線，其係由一第—分支3〇4〇及一第二分支3〇42所組 成。而第二輻射元件31〇係為一迴圈天線，其係由第一分支3〇4〇 與一第二分支306所組成。因此，第一輻射元件3〇4與第二輻射元 件310共用第一分支3040。而饋入元件3〇2電性連接於第一分支 3040 ’用來傳送或接收一第一頻段（低頻）及一第二頻段（高頻） 之無線訊號。匹配元件308電性連接於第三分支306，用以增加高 頻匹配。 雙頻天線30之運作方式類似於雙頻天線2〇,亦是透過平面倒F 型天線與迴圈天線的結合，來分別收發低頻及高頻無線訊號；因此， 第一分支3040及第二分支3〇42的總長大致等於低頻無線訊號的四 刀之一波長’而第三分支306及第一分支3040的總長大致等於高頻 無線訊號的二分之一波長。雙頻天線3〇與雙頻天線2〇不同之處在 於雙頻天線30之第一分支3〇4〇、第二分支3042及第三分支3〇6分 別包含多個彎折，且增加了匹配元件308，以節省空間並提高操作 頻寬。再者，匹配元件308空間上設置於第一分支3040及第三分支 3〇6間’但不限於此，可適性地改變匹配元件3〇8之位置、尺寸、 材質等參數’以調整雙頻天線30在高頻頻段的匹配條件，滿足不同 系統或使用者的需求。 M426892 另外，藉由改變接地元件300的尺寸大小、第三分支3〇6和接 地^0件300的連接位置等參數，亦可調整低頻無線訊號及高頻無線 訊號的匹配條件，以適用於不同無線傳輸系統。至於饋入元件迎 的设計和使用，應為本領域具通常知識者所熟知，在此不資述。實 際上，根據不同系統或使用者的需求，本領域具通常知識者可依據 本創作之雙頻天線30來進一步調整第一輕射元件3〇4、第二輕射元 件310、饋入元件3〇2、接地元件3〇〇以及匹配元件之尺寸、材 φ 質、位置等特性，以提高雙頻天線30的適用範圍，而不限於此。另 外，本創作之雙頻天線30僅示範性的透過各元件間彼此平行或垂 直，或視情況需求適性地增/減彎折處的設置，用以達到空間上的節 省，凡是可達到本創作之相同目的者，亦屬於本創作之範疇。 值得注意的’本創作之雙頻天線30透過平面倒F型天線及迴圈 天線，來增加操作頻段，以解決傳統上平面倒1?型天線存在之頻寬 不理想的問題，以適用於具雙頻需求之無線通訊系統，如無線區域 •網路（WLAN)系統。 明參考第4圖，第4圖為本創作雙頻天線之電壓駐波比 (Volt^geStandingWaveRatio，VSWR)示意圖。如第 4 圖所示， 在低頻頻段（2.4GHz-2.5GHz)及高頻頻段（5 l5GHz_5 85GHz)中， 雙頻天線30所能提供的電壓駐波比皆小於2，甚至在特定低頻或是 高頻頻段已可達到電壓駐波比小於1.5的情形，如標記點、M426892 V. New Description: [New Technology Field] This creative system is a dual-band antenna, especially a dual-band antenna that combines a loop antenna and a planar 隹4 F antenna to transmit and receive dual-frequency wireless signals. [Prior Art] Electronic products with wireless communication, such as notebook computers, personal digital assistants (Pe-faced al Digital Assistant), etc., are transmitted through antennas (4) or receive radio waves to transmit or exchange non-wireless electrical signals. Access to the wireless network. Therefore, in order to make it easier for users to access the wireless rail network, the bandwidth of the ideal antenna should be increased as much as possible within the permissible range, and the size should be minimized to match the trend of shrinking electronic products. In the prior art, a loop antenna (LoopAntenna) is an electric conductor that is wound into a closed curve shape on a plane, and is usually wound into a circle, a square, a triangle, etc., and the principle of the crucible is similar to that of a dipole antenna, and is also a resonance type. antenna. Please refer to FIG. 1A, which is a schematic diagram of a conventional loop antenna 10. As can be seen from FIG. 1A, the loop antenna 10 is a circular ring-shaped conductor disposed on the xy plane, which has a thin profile (L〇w pr0fiie) and can be applied to the trend of shrinking the size of electronic products, but the loop antenna 10 is less flexible in design and does not easily shrink in size. Another common type of wireless communication antenna is the Planar inverted F-type antenna (Planar M426892 -I-FAntenna, HFA). As its name implies, its shape is similar to the "F" after rotation and flipping. Please refer to FIG. 1B, which is a schematic diagram of a conventional _plane inverted f-type antenna 12. In general, planar planar antenna 12 is primarily comprised of a light projecting component (10), conductive pins 122, 124A, and a feed component 126. When the feed element 126 feeds current, it can flow from the feed element 126 through the conductive pin 122 and the conductive pin 124 according to the lion type, and finally returns to a ground, and the second route is fed: The incoming component 126 flows through the conductive pin 122 and is finally transmitted by the light-emitting component 12 to the receiving end in an electromagnetic wave mode. It should be noted that in the first route, since the current flows in the conductive pin m and the conductive pin 124 are opposite, the electromagnetic wave is not generated by the spectral vibration; in the first route, the current flows through the length just enough. By dividing the wavelength of the electromagnetic wave, it is possible to resonate to generate electromagnetic waves. Planar inverted F antennas for wireless communication systems with high bandwidth requirements, such as wireless local area networks (WLAN) systems, whose bandwidth is still not ideal, thus limiting the scope of application, how to effectively improve the bandwidth of the antenna , • has become one of the goals of the industry. [New content] Therefore, the main purpose of this creation is to provide a dual-frequency antenna. The present invention discloses a dual-frequency antenna comprising: a grounding component electrically connected to a ground end, a -feeding component, a wire transmitting - a "band" and a second band of radio signals, a first radiating element, Transmitting and receiving the wireless signal of the first frequency band, the first radiating element M426892 includes a -th-branch electrically connected to the feeding component; and - a second branch connected to the first branch; and a first a third branch, one end of which is electrically connected to a boundary between the first branch and the second branch, and the other end is electrically connected to the grounding element, and the third branch forms an antenna with the first branch, and becomes a second a radiating element for transmitting and receiving wireless signals of the second frequency band. [Embodiment] Referring to FIG. 2, FIG. 2 is a schematic diagram of a dual-frequency antenna 2A of the present embodiment. The dual frequency antenna 20 has a dual resonant mode comprising a grounding element 2, a feed element 202, a -first light projecting element 204 and a second light emitting element. The grounding component 200 is electrically connected to a ground end. The first radiating element 2〇4 is similar to a planar inverted f-shaped antenna, which is composed of a first branch 2040 and a second branch 2〇42. The second radiating element 208 is a loop antenna composed of a first branch 2〇4〇 and a third branch 206. It can be seen that the first radiating element 2〇4 and the second radiating element 2〇8 share the first branch 2040. The feeding component 202 is electrically connected to the first branch 2〇4〇 for transmitting or receiving a wireless signal of a first frequency band (low frequency) and a second frequency band (high frequency). Therefore, the dual-frequency antenna 20 can be regarded as a combination of a planar inverted-F antenna and a loop antenna, and is used for transmitting and receiving low-frequency and high-frequency wireless signals, respectively. In detail, the first light-emitting component 204 includes a first branch 2040 and a second branch 2042 whose total length is substantially equal to a quarter-wavelength of the low-frequency wireless signal used to transmit and receive low-frequency wireless signals. The second radiating element 2〇8 includes a third branch 206 and a first branch 2040 having a total length substantially equal to one of the high frequency trackless numbers for transmitting and receiving high frequency wireless signals. In addition, by changing the size of the grounding element 2〇〇M426892, the connection position of the third branch 206 and the grounding component 200, the matching conditions of the low frequency wireless signal and the high frequency wireless signal can also be adjusted to be suitable for different wireless transmissions. SiS. Similarly, the design and use of the feed element 202 is well known to those skilled in the art and will not be described herein. In fact, according to the needs of different systems or users, those skilled in the art can further adjust the first radiating element 204, the second radiating element 208, the feeding element 2〇2 according to the dual-frequency antenna 2〇 of the present invention. The size, material, position and the like of the grounding element 200 are used to improve the application range of the dual-frequency antenna 2〇, and are not limited thereto. It is worth noting that the main spirit of the present invention is that the dual-band antenna 2 is formed by the first branch 2040 and the third branch 206, except that the first branch 2040 and the second branch 2042 form a main radiating body of the planar inverted-F antenna. The loop antenna, in order to increase the operating frequency band, solves the problem that the bandwidth of the conventional planar inverted F antenna is not ideal, and is suitable for a wireless communication system with dual frequency requirements, such as a wireless local area network (WLan) system. In addition, the shape and material of each component of the dual-frequency antenna 20 are not limited. For example, in Fig. 2, the first branch 2_ and the second branch outline 2 respectively comprise a bend and are L-shaped, and the third branch 2〇6 is taken by the first branch lion and the second branch. The junction of 2 extends perpendicularly to the grounding element: fine, secret, as long as the current path of the first branch 2G4G and the second branch 2G42 is ensured, and the first branch 2040 and the third branch 206 can form the loop antenna correctly. can. Referring to FIG. 3', FIG. 3 is a diagram showing the dual-frequency antenna 3〇 of the first embodiment of the present invention. The third-frequency antenna 3G shown in FIG. 3 and the dual-frequency antenna buckle shown in FIG. 2 have the same target. Like the structure, in detail, the dual-frequency antenna 3A includes a grounding element 3〇〇, a feeding element 302, a first-lighting element 3〇4, a second light-emitting element 31〇, and a matching element 308. The grounding element 300 is electrically connected to a ground end. The first radiating element 3〇4 is similar to a planar inverted-F antenna, which is composed of a first branch 3〇4〇 and a second branch 3〇42. The second radiating element 31 is a loop antenna composed of a first branch 3〇4〇 and a second branch 306. Therefore, the first radiating element 3?4 shares the first branch 3040 with the second radiating element 310. The feed component 3〇2 is electrically connected to the first branch 3040' for transmitting or receiving a wireless signal of a first frequency band (low frequency) and a second frequency band (high frequency). The matching component 308 is electrically coupled to the third branch 306 for increasing high frequency matching. The dual-frequency antenna 30 operates in a manner similar to the dual-frequency antenna 2〇, and is also a combination of a planar inverted-F antenna and a loop antenna to transmit and receive low-frequency and high-frequency wireless signals respectively; therefore, the first branch 3040 and the second branch The total length of 3〇42 is approximately equal to one wavelength of the four-pulse of the low-frequency wireless signal' and the total length of the third branch 306 and the first branch 3040 is approximately equal to one-half of the wavelength of the high-frequency wireless signal. The dual-frequency antenna 3〇 is different from the dual-frequency antenna 2〇 in that the first branch 3〇4〇, the second branch 3042 and the third branch 3〇6 of the dual-band antenna 30 respectively comprise a plurality of bends, and a matching is added. Element 308 to save space and increase operating bandwidth. Furthermore, the matching component 308 is spatially disposed between the first branch 3040 and the third branch 3〇6, but is not limited thereto, and can appropriately change the position, size, material, and the like of the matching component 3〇8 to adjust the dual frequency. The matching condition of the antenna 30 in the high frequency band satisfies the requirements of different systems or users. M426892 In addition, by changing the size of the grounding component 300, the connection position of the third branch 3〇6 and the grounding member 300, the matching conditions of the low frequency wireless signal and the high frequency wireless signal can also be adjusted to suit different conditions. Wireless transmission system. As regards the design and use of feed components, it should be well known to those of ordinary skill in the art and will not be described here. In fact, according to the needs of different systems or users, those skilled in the art can further adjust the first light-emitting element 3〇4, the second light-emitting element 310, and the feeding element 3 according to the dual-frequency antenna 30 of the present invention. 〇2, the grounding element 3〇〇, and the characteristics of the matching element such as the size, material quality, position, etc., to improve the application range of the dual-frequency antenna 30, without being limited thereto. In addition, the dual-frequency antenna 30 of the present invention is only exemplarily transparent or perpendicular to each other, or the position of the bend is increased or decreased according to the situation, so as to achieve space saving, and the creation can be achieved. The same purpose is also within the scope of this creation. It is worth noting that the dual-frequency antenna 30 of the present invention increases the operating frequency band through the planar inverted F-type antenna and the loop antenna to solve the problem that the bandwidth of the conventional planar inverted 1 antenna is not ideal, and is suitable for the problem. A wireless communication system with dual-frequency requirements, such as a wireless area network (WLAN) system. Referring to Figure 4, Figure 4 is a schematic diagram of the voltage standing wave ratio (Volt^geStandingWaveRatio, VSWR) of the dual-band antenna. As shown in Figure 4, in the low frequency band (2.4GHz-2.5GHz) and the high frequency band (5 l5GHz_5 85GHz), the dual-frequency antenna 30 can provide a voltage standing wave ratio of less than 2, even at a specific low frequency or In the high frequency band, the voltage standing wave ratio is less than 1.5, such as marking points,
Mkr6、Mkr7 及 Mkr8 所示之 VSWR 之值分別為 3 381、2.843、1.310 M426892 及1.616 ’且對應到的頻率分別為3 3GHz、3 、$ ughz、 5.85GHz。另外，請參考第5圖，第5圖為本創作雙頻天線3〇之天 線效率不意圖。如第5圖所示，在低頻頻段（2.4GHz-2.5GHz)中， 雙頻天線30已能提供超過5〇%的傳輸效率，甚至於某些特殊頻段 可高達60%的傳輸效率’至於在高頻頻段（5 15GHz 5 85GHz)中， 雙頻天線30至少也能提供將近5〇%的傳輸效率。因此，同時參考 第4圖及第5圖後，將不難發現雙頻天線3〇確實能在低頻及高頻頻 段實現穩定的無線訊號傳輸，並且滿足無線區域網路（WLAN)系 統中針對無線傳輸標準80Zlla/b/g/n的傳輸條件。 於本創作之實施例中，雙頻天線係根據平面倒F型天線的設計 条構下，另外結合迴圈天線的概念，除了可配合電子產品體積縮小 之趨勢外，亦可同時提供低頻及高頻無線訊號的傳輸，利於雙頻天 線有效傳輸於不同無線傳輸系統。因此，本領域具通常知識者可依 據實際需求進行修飾與變化’藉㈣設其舰配元件或是改變其連 結方式’產生不同酿祕配條件，肋暖傳輸賴及高頻無線 訊號來達到本創作之相同目的者，皆屬於本創作之範嘴。 總而言之，本創作提供之雙頻天線係以平面倒F型天線為設計 基礎’結合了棚天線，以翻於具雙娜輸需权麟通訊系統； 同時’各元件可包含有多處彎折，㈣於空間節省。此外，雙頻天 線亦可適性地設置匹配元件’用以織低齡高麵段之匹配條 件’大幅提升雙頻天線的應用範圍。. 述僅為本創作之較佳實_，凡依本_申請專利範圍所做 =等變化與修飾1應屬本創作之涵蓋範圍。 【圖式簡單說明】 第1Α圖為習知—迴圈天線之示意圖。 第1Β圖為習知一平面倒F型天線之示意圖。 第2圖為本創作實施例一雙頻天線之示意圖。 第3圖為本創作實施例另一雙頻天線之示意圖。 第4圖為本創作雙頻天線之電壓駐波比示意圖。 第5圖為本創作雙頻天線之天線效率示意圖。 【主要元件符號說明】 10 迴圈天線 12 平面倒F型天線 120 輕射元件 122、- 124 導電接腳 126 饋入元件 20、30 雙頻天線 200、300 接地元件 202、302 饋入元件 204 、 304 第一輕射元件 2040、3040 第一分支 2042 > 3042 第二分支 11 M426892The VSWR values shown by Mkr6, Mkr7, and Mkr8 are 3 381, 2.843, 1.310 M426892, and 1.616 ′, respectively, and the corresponding frequencies are 3 3 GHz, 3 , $ ughz, and 5.85 GHz, respectively. In addition, please refer to Figure 5, which is not intended for the efficiency of the antenna of the dual-band antenna. As shown in Figure 5, in the low frequency band (2.4GHz-2.5GHz), the dual-band antenna 30 can provide more than 〇% transmission efficiency, and even in some special frequency bands, it can achieve transmission efficiency as high as 60%. In the high frequency band (5 15 GHz 5 85 GHz), the dual band antenna 30 can provide at least 〇% transmission efficiency. Therefore, referring to Figure 4 and Figure 5 at the same time, it is not difficult to find that the dual-band antenna 3〇 can achieve stable wireless signal transmission in the low frequency and high frequency bands, and meet the wireless local area network (WLAN) system for wireless Transmission standard 80Zlla/b/g/n transmission conditions. In the embodiment of the present invention, the dual-frequency antenna is based on the design of the planar inverted-F antenna, and the concept of the loop antenna is combined with the trend of shrinking the size of the electronic product, and the low frequency and the high frequency are simultaneously provided. The transmission of the frequency wireless signal facilitates the effective transmission of the dual-frequency antenna to different wireless transmission systems. Therefore, those with ordinary knowledge in the field can modify and change according to actual needs. 'By (four) set their ship-matching components or change their connection method' to generate different brewing conditions, ribs warm transmission and high-frequency wireless signals to achieve this The same purpose of creation is the mouth of this creation. All in all, the dual-band antenna provided by this creation is based on the design of a planar inverted-F antenna, which combines the shed antenna to turn it into a dual-transmission power communication system; at the same time, each component can contain multiple bends. (4) Saving in space. In addition, the dual-frequency antenna can also appropriately set the matching component 'used to match the matching conditions of the younger high-end segment' to greatly enhance the application range of the dual-frequency antenna. The description is only the best of the creation _, and the changes and modifications 1 made according to the scope of this patent application should be covered by this creation. [Simple description of the diagram] The first diagram is a schematic diagram of a conventional-loop antenna. The first diagram is a schematic diagram of a conventional planar inverted-F antenna. FIG. 2 is a schematic diagram of a dual-frequency antenna according to an embodiment of the present invention. FIG. 3 is a schematic diagram of another dual frequency antenna according to the present embodiment. The fourth figure is a schematic diagram of the voltage standing wave ratio of the dual-frequency antenna. Figure 5 is a schematic diagram of the antenna efficiency of the dual-band antenna. [Main component symbol description] 10 loop antenna 12 plane inverted F antenna 120 light projecting element 122, - 124 conductive pin 126 feeding element 20, 30 dual frequency antenna 200, 300 grounding element 202, 302 feeding element 204, 304 first light element 2040, 3040 first branch 2042 > 3042 second branch 11 M426892
206、306 208 ' 310 308 Mkr5 ' Mkr6 VSWR 第三分支 第二輻射元件 匹配元件206, 306 208 ' 310 308 Mkr5 ' Mkr6 VSWR third branch second radiating element matching element
Mkr7及Mkr8 標記點 電壓駐波比 12Mkr7 and Mkr8 marker voltage standing wave ratio 12