201115840 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種圓極化平板天線，特別是有關於 一種縮小化之圓極化平板天線。 【先前技術】 隨著無線射頻辨識系統技術(RFID)應用的逐漸普及， 使得物件辨識更快速也更安全。且為方便使用者攜帶或使 • 用，輕薄短小成為電子產品的主要設計趨勢，因此當圓極 化平板天線應用在該等電子產品上時，天線的尺寸大小成 為設計天線時的重要考量之一。 般圓極化平面天線的设計可分為單饋入與雙饋入兩 種方式。單饋入之圓極化平板天線可利用截角、挖槽孔或 植入窄槽縫等微擾方式，使原本正交的模態激發出兩個等 振幅且相位差90度的相鄰垂直模態，如論文（”Circularly polarized microstrip antenna with a tuning stub,- Electron. # Lett.，V〇1. 34, pP. 831·832, April 3〇, i"8.)所提及。但此種 天線雖然只需單層基板即可，但其缺點是操作頻寬非常狭 窄，通常不超過其線性極化輻射頻寬的三分之一， 限制條件較多’不容易調整天線圓極化特性及阻抗匹配， 所以設計困難。至於雙饋入之圓極化平板天線則通常是使 用Wilkinson功率分配器或支路耦合器（branch_line c〇upier) 來提供振幅相等且相位相差90度的激發電流，如台灣專利 第096145886申請號，且兩個饋入點需分別位於互相垂直 的方向。此種天線具有較單饋入之天線頻寬大且天線圓極 201115840 化特性良好等優點，但由於需要使用兩層以上的基板，以 致天線體積變得過於龐大。 【發明内容】 本發明之一目的係在提供一種圓極化平板天線，藉以 在不影響天線輻射效能情況下有效縮小天線尺寸的圓極化 平板天線，特別是以線路蜿蜒與電容耦合達成電流路徑延 長與90度相位差之天線設計機制。201115840 VI. Description of the Invention: [Technical Field] The present invention relates to a circularly polarized panel antenna, and more particularly to a reduced-width circularly polarized panel antenna. [Prior Art] With the increasing popularity of Radio Frequency Identification System (RFID) applications, object recognition is faster and safer. And for the convenience of users to carry or use, light and short become the main design trend of electronic products, so when the circularly polarized panel antenna is applied to these electronic products, the size of the antenna becomes one of the important considerations when designing the antenna. . The design of a circularly polarized planar antenna can be divided into single feed and double feed. A single-input circularly polarized planar antenna can use a perturbation method such as a truncated angle, a slotted hole or a narrow slot to make the original orthogonal mode excite two adjacent vertical axes of equal amplitude and 90 degrees out of phase. Modal, as mentioned in the paper ("Circularly polarized microstrip antenna with a tuning stub, - Electron. # Lett., V〇1. 34, pP. 831.832, April 3〇, i"8.). Although the antenna only needs a single-layer substrate, the disadvantage is that the operation bandwidth is very narrow, usually not more than one-third of the linear polarization radiation bandwidth, and the limitation condition is more. It is not easy to adjust the circular polarization characteristics of the antenna. And impedance matching, so the design is difficult. As for the double-input circularly polarized panel antenna, the Wilkinson power divider or branch coupler (branch_line c〇upier) is usually used to provide the excitation current with equal amplitude and phase difference of 90 degrees. For example, the application number of Taiwan Patent No. 096145886, and the two feed points need to be respectively located in mutually perpendicular directions. Such an antenna has the advantages of a larger antenna width than a single feed and a good roundness of the antenna circle 201115840, but it is required to use two The substrate above the layer is such that the antenna volume becomes too large. SUMMARY OF THE INVENTION One object of the present invention is to provide a circularly polarized panel antenna, thereby effectively reducing the size of the antenna without affecting the radiation performance of the antenna. The antenna, in particular, is an antenna design mechanism that achieves a current path extension and a 90 degree phase difference by coupling the line and the capacitor.
因此，在一實施例中，此圓極化平板天線包括介質基 板、第一輻射元件、第二輻射元件、及饋入單元。介質基 板具有相對之第一表面及第二表面。第一輻射元件係設於 介質基板之第一表面，並包括位於第一表面之第一線段及 第二線段，此二線段的一端與相鄰近線段垂直，另包含一 第一耦合金屬片。第二輻射元件係設於介質基板之第二表 面，並包括位於一第二表面之第三線段及第四線段，此二 線段的-端與相鄰近線段垂直，另包含一第二麵合金屬片。 例中 質基板之第-表面和第另一繼有一貫穿， 中心饋入線與饋入單=饋入訊號’以使，Α接頭' 地端與錄介質基板連接，並使說接頭的， 乐一表面的接地面電性連接。 在又一實施例中，餚一 角形、圓形、橢圓形之^可以是：矩形'菱形、· 段及第二線段相鄰近的1 其連接第—表面之第一《 使訊號功率平均饋人第用以分配饋人訊號功率，^ 弟線段及第二線段。 201115840 ,在又一實施例中，第一或第二耦合金屬片可以是一矩 形菱开V、二角形、圓形、橢圓形之金屬片。 ^在又一實施例中，位於第一表面及第二表面之第一線 k及第一線段可以是L形彎折、门字型或圓弧形之蜿蜒金 屬線羊又且第一線段及第二線段係概呈垂直地以其相遠離 之另一端各別延伸成為天線之輻射部。 在又一實施例中，第一線段與第二線段的長度相近。 在又一實施例中，第三線段與在又一實施例中’第一 線段與二線段的長度相近。四線段的長度相近。 在又一實施例中’接地面可以是一矩形、菱形、三角 形、圓形、橢圓形之金屬帶或與介質基板近似形狀的金屬 平面。 在又一實施例中’位於第二表面之接地面之饋入線段 可以是長條形、L形或门字型之金屬線段。 在又一實施例中’介質基板可以是玻璃纖維基板或陶 究基板。 在又一實施例中’介質基板可以是矩形或圓盤形。 綜上所述’本發明之實施例之圓極化平板天線具有結 構簡單、尺寸短小、圓極化軸比頻寬集中、收發角度廣且 增益高等優點，因此十分適合應用於無線通訊系統之天線 設計上，尤其適合輕薄短小之電子通訊產品，具有極高的 產業價值。 【實施方式】 201115840 以下將以圖示及詳細說明清楚說明本發明之精神，如 熟悉此技術之人員在瞭解本發明之實施例後，當可由本發 明所教示之技術，加以改變及修飾，其並不脫離本發明之 精神與範圍。 請參見第1A圖至第1C圖，其繪示是本發明圓極化平 板天線的一實施例。請亦參見第2圖至第7圖，其係本發 明之實施例之圓極化平板天線的相關天線特性說明。本實 施例之圓極化平板天線20係應用在RFID UHF 920 MHz之 Φ 操作頻率，其包括介質基板10、第一輻射元件21、第二輻 射元件22、以及一饋入單元30。第一輻射元件21係第一 線段211、第二線段212和第一耦合金屬片213;第二輻射 元件22係包括第三線段221和第四線段222和第二耦合金 屬片223。 介質基板10具有相對之第一表面21及第二表面22, 在本實施例令，介質基板10是一矩形的玻璃纖維板(FR4)， 其尺寸為60 X 60 mm2。第一線段211、第二線段212、饋 φ 入端電極311和耦合金屬片213係設置於介質基板1〇的第 一表面21。第三線段221、第四線段222，接地端電極321 和金屬片223係設置於介質基板1〇的第二表面22。在本 實施例中，饋入端電極311與接地端電極321分別為設於 介質基板10之第一表面21與第二表面22上的菱形金屬平 面，其尺寸為14 X 14 mm2。在饋路端電極311與接地端電 極321上設置有一通孔33，此通孔33於饋入端電極311 上之點定義為正訊號端31，於接地端電極321上之點定義 為負訊虎端3 2。 201115840 值得一提的是’本實施例之介質基板10並不以矩形為 限，它也可以是圓盤形或其它相似形狀，且其材質除了玻 璃纖維板(FR4)外，也可以使用陶瓷基板或其它可用的介質 材料。而接地端電極321亦不以菱形為限，它也可以是圓 形、三角形或與饋入端電極311近似形狀的金屬平面。 本實施例之金屬輻射部（未標示）包括位於第一表面11 之第一線段211及第二線段212,且第一線段211與第二線 段212的長度相近。在本實施例中，第一線段211、第二 線段212分別為一呈门字型彎折的婉蜒金屬線段，其中第 一線段211之一端與第二線段212之一端相鄰近，且概呈 互相垂直地分別電氣連接於饋入單元（饋入端電極)311之 菱形尖端’以饋入訊號；而第一線段211之另一端與第二 線段212之另一端係相遠離且概呈互相垂直的方向。位於 第一表面11之第一線段211的總長為100mm，第二線段 212的總長為98mm。且第一線段211及第二線段212除了 门字型彎折結構外，也可以是圓弧形之金屬線段，並於同 一面設置一可調式耦合金屬片213,作為此天線之微調機 制。 金屬輻射部亦包括位於第二表面12之第三線段221及 第四線段222，且第三線段221與第四線段222的長度相 近。在本實施例中，第三線段221、第四線段222分別為 一呈门字型彎折的婉蜒金屬線段，其中第三線段221之一 端與第四線段222之一端相鄰近，且概呈互相垂直地分別 電氣連接於接地面（接地端電極)321之菱形尖端’以饋入訊 號；而第三線段221之另一端與第四線段222之另一端係 201115840 相遠離且概呈互相垂直的方向。位於第二表面i2之第 段221的總長為i〇〇mm，第四線段奶的總長為98mm。 第三線段221及第四線段222除了叫型彎折結構外，也 可以是圓孤形之金屬線段’並於同一面設置—可調式耗合 金屬片223，作為該天線之微調機制。 之第饋極311於其金屬部分設有—貫穿介質基板10 ^和第二表面12的通孔3G，其孔直徑為約 技 SMA接頭（切示)連接以饋人訊號，並使Thus, in one embodiment, the circularly polarized panel antenna includes a dielectric substrate, a first radiating element, a second radiating element, and a feed unit. The dielectric substrate has opposing first and second surfaces. The first radiating element is disposed on the first surface of the dielectric substrate and includes a first line segment and a second line segment on the first surface. One end of the two line segments is perpendicular to the adjacent line segments, and further includes a first coupling metal piece. The second radiating element is disposed on the second surface of the dielectric substrate, and includes a third line segment and a fourth line segment on a second surface, the end of the two line segments being perpendicular to the adjacent line segments, and further comprising a second facing metal sheet. In the example, the first surface of the medium substrate and the first one are successively penetrated, the center feed line and the feed order = feed signal 'to make the ground end of the Α joint 'connect with the recording medium substrate, and make the joint, Le Yi The ground plane of the surface is electrically connected. In still another embodiment, the angle of the corner, the circle, and the ellipse may be: a rectangle 'diamond', a segment and a second line segment adjacent to each other, and the first surface of the first surface is connected to the signal. The first is used to distribute the feed signal power, the ^ line segment and the second line segment. In still another embodiment, the first or second coupling metal piece may be a rectangular diamond-shaped V-shaped, circular, elliptical metal piece. In still another embodiment, the first line k and the first line segment on the first surface and the second surface may be an L-shaped bent, a gate-shaped or a circular-shaped metal wire and first The line segment and the second line segment are vertically extended to the radiating portion of the antenna at a distance from each other. In yet another embodiment, the first line segment is similar in length to the second line segment. In yet another embodiment, the third line segment is similar in length to the first line segment and the second line segment in yet another embodiment. The length of the four segments is similar. In yet another embodiment, the ground plane may be a rectangular, diamond, triangular, circular, elliptical metal strip or a metal plane that is approximately shaped from the dielectric substrate. In yet another embodiment, the feed line segment located at the ground plane of the second surface may be an elongated, L-shaped or gate-shaped metal line segment. In yet another embodiment, the dielectric substrate can be a fiberglass substrate or a ceramic substrate. In yet another embodiment, the dielectric substrate can be rectangular or disc shaped. In summary, the circularly polarized planar antenna of the embodiment of the present invention has the advantages of simple structure, short size, concentrated circular polarization axis, wide transmission and reception angle, high gain, and the like, and is therefore suitable for an antenna of a wireless communication system. Designed, it is especially suitable for light, short and short electronic communication products with high industrial value. The embodiments of the present invention will be apparent from the following description of the embodiments of the present invention, which may be modified and modified by the teachings of the present invention. The spirit and scope of the invention are not departed. Referring to Figures 1A through 1C, an embodiment of a circularly polarized planar antenna of the present invention is illustrated. Please also refer to Figures 2 through 7, which are illustrative of the relevant antenna characteristics of a circularly polarized panel antenna of an embodiment of the present invention. The circularly polarized panel antenna 20 of the present embodiment is applied to the Φ operating frequency of the RFID UHF 920 MHz, which includes the dielectric substrate 10, the first radiating element 21, the second radiating element 22, and a feed unit 30. The first radiating element 21 is a first line segment 211, a second line segment 212 and a first coupling metal piece 213; the second radiating element 22 comprises a third line segment 221 and a fourth line segment 222 and a second coupled metal piece 223. The dielectric substrate 10 has a first surface 21 and a second surface 22 opposite thereto. In this embodiment, the dielectric substrate 10 is a rectangular fiberglass sheet (FR4) having a size of 60 X 60 mm 2 . The first line segment 211, the second line segment 212, the feed φ input terminal electrode 311, and the coupling metal piece 213 are disposed on the first surface 21 of the dielectric substrate 1A. The third line segment 221, the fourth line segment 222, the ground terminal electrode 321 and the metal piece 223 are disposed on the second surface 22 of the dielectric substrate 1A. In the present embodiment, the feed terminal electrode 311 and the ground terminal electrode 321 are respectively diamond-shaped metal planes disposed on the first surface 21 and the second surface 22 of the dielectric substrate 10, and have a size of 14 X 14 mm 2 . A through hole 33 is defined in the feeding end electrode 311 and the grounding end electrode 321, and a point on the feeding end electrode 311 is defined as a positive signal end 31, and a point on the grounding end electrode 321 is defined as a negative signal. Tiger end 3 2. 201115840 It is worth mentioning that the dielectric substrate 10 of the present embodiment is not limited to a rectangular shape, and may also be a disc shape or the like, and the material thereof may be a ceramic substrate or a glass substrate (FR4). Other available media materials. The ground terminal electrode 321 is also not limited to a diamond shape, and it may be a circular shape, a triangular shape, or a metal plane similar to the shape of the feed terminal electrode 311. The metal radiating portion (not shown) of this embodiment includes a first line segment 211 and a second line segment 212 at the first surface 11, and the first line segment 211 is similar in length to the second line segment 212. In this embodiment, the first line segment 211 and the second line segment 212 are respectively a gate-shaped bent base metal line segment, wherein one end of the first line segment 211 is adjacent to one end of the second line segment 212, and The diamond tips of the feed unit (feeding end electrode) 311 are electrically connected to each other perpendicularly to each other to feed the signal; and the other end of the first line segment 211 is away from the other end of the second line segment 212. In a direction perpendicular to each other. The total length of the first line segment 211 located at the first surface 11 is 100 mm, and the total length of the second line segment 212 is 98 mm. The first line segment 211 and the second line segment 212 may be arc-shaped metal segments in addition to the gate-shaped bent structure, and an adjustable coupling metal piece 213 is disposed on the same side as a fine adjustment mechanism of the antenna. The metal radiating portion also includes a third line segment 221 and a fourth line segment 222 on the second surface 12, and the third line segment 221 is similar in length to the fourth line segment 222. In this embodiment, the third line segment 221 and the fourth line segment 222 are respectively a gate-shaped bent base metal line segment, wherein one end of the third line segment 221 is adjacent to one end of the fourth line segment 222, and The diamond tips of the ground plane (ground electrode) 321 are electrically connected to each other vertically to feed the signal; and the other end of the third line 221 is separated from the other end of the fourth segment 222 by 201115840 and is substantially perpendicular to each other. direction. The total length of the second section i2 of the second surface i2 is i〇〇mm, and the total length of the fourth line of milk is 98 mm. The third line segment 221 and the fourth line segment 222 may be circularly shaped metal segments </ br> and disposed on the same surface as the shape-bending structure. The adjustable metal sheet 223 is used as a fine adjustment mechanism of the antenna. The feed electrode 311 is provided at its metal portion with a through hole 3G penetrating through the dielectric substrate 10^ and the second surface 12, the hole diameter of which is an approximate SMA connector (not shown) connected to feed the signal, and
頭的中心饋入線與饋入端電極311 SMA接頭的接地端則經由 電極功電氣連接。 -第-表面12的接地端 迷饋人端電極311的作㈣在於使饋人訊號的輸入 始1以平均分配給位於第一表面11之第一線段21丨及第 。其中除了菱形外，饋入單元311也可以是矩 ” 盤形之金屬帶，並搭配接地端電極321電連接位於 第二表面12之第三線段221及第四線段222,可有效發揮 /、、線之優良性此。當然，饋入端電極311並不限於使用 上述菱形結構，它也可以用其它可將饋入訊號能量平均分 配成多個輸出的帶線結構來實現。 凊參見第2圖至第7圖，其為本實施例之圓極化平板 天線20的實作量測結果。由第2圖之反射損失結果可得到 天線=卩且抗頻寬，即以γ軸l〇dB為準橫切過去，對應曲 線所得之頻寬為906〜957MHz，即957-906=51MHz。 第3圖所示為本實施例之圓極化平板天線2〇之史密斯 圖的實驗結果，第4圖及第5圖為天線在操作頻率920MHz 201115840 的輻射場型量測結果；f 6圖則為操作頻帶内之圓極化平 板天線轴比的實驗結果。本實施例之圓極化平板天之 軸比頻寬以Y轴3dB為準橫切過去，對應曲線所得之頻寬 為915〜930馳’即930_915=15MHz。第7圖則為操作頻 帶内之圓極化平板天線20的增益實驗量測結果，本實施例 之圓極化平板天線20在操作頻帶内的增益約在1〇〜丨^則 範圍内。The center feed line of the head and the ground end of the feed terminal electrode 311 SMA connector are electrically connected via the electrode work. - Grounding of the first surface 12 The fourth step of the feeding of the human terminal electrode 311 is to cause the input of the feeding signal to be equally distributed to the first line segment 21 and the first surface located at the first surface 11. In addition to the diamond shape, the feeding unit 311 can also be a metal strip of the moment "disk shape", and is electrically connected to the third line segment 221 and the fourth line segment 222 of the second surface 12 in conjunction with the grounding electrode 321 to effectively perform /, The quality of the line is of course. Of course, the feed terminal electrode 311 is not limited to the use of the above-described diamond structure, and it can also be realized by other strip line structures which can evenly distribute the feed signal energy into a plurality of outputs. Up to Fig. 7, which is the actual measurement result of the circularly polarized panel antenna 20 of the present embodiment. From the reflection loss result of Fig. 2, the antenna = 卩 and the anti-bandwidth can be obtained, that is, the γ-axis is 〇 dB In the past, the bandwidth obtained by the corresponding curve is 906~957MHz, that is, 957-906=51MHz. Fig. 3 shows the experimental result of the Smith chart of the circularly polarized panel antenna of the present embodiment, Fig. 4 And Fig. 5 is the radiation field measurement result of the antenna at the operating frequency of 920MHz 201115840; the f6 diagram is the experimental result of the axial ratio of the circularly polarized plate antenna in the operating band. The circularly polarized plate axis of this embodiment The specific bandwidth is cut across the 3dB of the Y-axis, and the corresponding curve The obtained bandwidth is 915 to 930 rpm, that is, 930_915 = 15 MHz. Fig. 7 is a gain experimental measurement result of the circularly polarized panel antenna 20 in the operating band, and the circularly polarized panel antenna 20 of the present embodiment is in the operating band. The gain inside is approximately in the range of 1〇~丨^.
由上，說明可知，本實施例之圓極化平板天線2〇的結 構十分簡單，其由一正方形的玻璃纖維板當作基板1〇，並 於此基板1G的第-表面U上設置第—線段叫、第二線段 212、 耦合金屬片213及饋入端電極311，且在此基板1〇 的第一表面12上a又置第二線段221、第四線段222、搞合 金屬片223及接地面321，由饋入端電極311將饋入訊號 之輸入功率平均分配為等振幅且相位相差9〇度的兩個輸 出此罝，並藉由相近的第一表面11之第一線段2u與第二 線段212以概呈相互垂直方式連接至餽入端電極31丨，並 搭配第二表面12之第三線段221與第四線段222也以概呈 相互垂直方式連接至接地端電極321，再使用耦合金屬片 213、 223來延遲電流擾動以激發出天線的圓極化特性，並 作電磁波輻射與接收。 综上所述’本實施例之圓極化平板天線2〇具有結構簡 單、尺寸短小、圓極化軸比頻寬集中、收發角度廣且增益 高等優點’因此十分適合應用於無線通訊系統之天線設計 上’尤其適合輕薄短小之電子通訊產品，具有極高的產業 價值。 ' 201115840 本發明所揭露如上之各實施例中，並非用以限— 明，任何熟習此技藝者，在不脫離本發明之精神和^本發 當可作各種之更動與潤飾，因此本發明之保護&内’ 附之申請專利範圍所界定者為準。 軏圍$視後 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與 能更明顯易懂’所附圖式之詳細說明如下： 歹1As can be seen from the above, the structure of the circularly polarized planar antenna 2A of the present embodiment is very simple, and a square fiberglass plate is used as the substrate 1 and a first line segment is provided on the first surface U of the substrate 1G. The second line segment 212, the coupling metal piece 213 and the feeding end electrode 311, and the second line segment 221, the fourth line segment 222, and the metal piece 223 are connected to the first surface 12 of the substrate 1A. On the ground 321 , the input power of the feed signal is evenly distributed by the feed terminal electrode 311 to two output outputs of equal amplitude and phase difference of 9 罝 degrees, and by the first line segment 2u of the similar first surface 11 and The second line segment 212 is connected to the feed terminal electrode 31A in a substantially perpendicular manner, and the third line segment 221 and the fourth line segment 222 of the second surface 12 are also connected to the ground terminal electrode 321 in a substantially perpendicular manner to each other. The coupling metal pieces 213, 223 are used to delay current disturbance to excite the circular polarization characteristics of the antenna and to perform electromagnetic wave radiation and reception. In summary, the circularly polarized planar antenna 2 of the present embodiment has the advantages of simple structure, short size, concentrated circular polarization axis, wide transmission and reception angle, and high gain, so it is very suitable for antennas used in wireless communication systems. Designed to be especially suitable for light and short electronic communication products, with high industrial value. The present invention is not limited to the above-described embodiments, and any person skilled in the art can make various modifications and retouchings without departing from the spirit and scope of the present invention. The protection & within the scope of the patent application is subject to change. BRIEF DESCRIPTION OF THE DRAWINGS [0009] The above and other objects, features, advantages and advantages of the present invention will become more apparent and understood.
第1A圖至第1C圖為根據本發明之一實施例之圓極 平板天線的示意圖，其中第1A圖為正面圖，第1B為， 面圖，第1C圖為侧面圖。 、身 第2圖為本實施例之圓 數據圖。 極化平板天線的反射損失實測 斯圖 第3圖為本實施例之圓極化平板天線的實驗結果史密1A to 1C are schematic views of a circular-pole panel antenna according to an embodiment of the present invention, wherein FIG. 1A is a front view, FIG. 1B is a front view, and FIG. 1C is a side view. Figure 2 is a circle data diagram of the present embodiment. The reflection loss of the polarized panel antenna is measured. Figure 3 is the experimental result of the circularly polarized panel antenna of the present embodiment.
第4圖為本實施例之圓極化平板天線在χ-ζ平面的輕 射場型實驗結果。 ° 第5圖為本實施例之圓極化平板天線在平面的幸5 射場型實驗結果。 $ 第6圖為本實施例圓極化平板天線在操作頻帶内之天 線軸比實驗結果。 第7為本實施例之圓極化平板天線在操作頻帶内之天 線增益實驗結果。 201115840 【主要元件符號說明】 10介質基板 12第二表面 21第一輻射元件 30饋入單元 32負訊號端 211第一線段 213第一耦合金屬片 222第四線段 311饋入端電極 11第一表面 20輻射元件 22第二輻射元件 31正訊號端 33通孔 212第二線段 221第三線段 223第二耦合金屬片 321接地端電極 11Fig. 4 is a result of the light field type experiment of the circularly polarized panel antenna of the present embodiment in the χ-ζ plane. ° Fig. 5 is the result of the experimental experiment of the circular-polarized planar antenna of the present embodiment in the plane. $ Fig. 6 is a graph showing the results of the antenna axis ratio of the circularly polarized panel antenna in the operating band of the present embodiment. The seventh is the antenna gain experimental result of the circularly polarized panel antenna of the present embodiment in the operating band. 201115840 [Description of main component symbols] 10 dielectric substrate 12 second surface 21 first radiating element 30 feeding unit 32 negative signal end 211 first line segment 213 first coupling metal piece 222 fourth line segment 311 feeding end electrode 11 first Surface 20 radiating element 22 second radiating element 31 positive signal end 33 through hole 212 second line segment 221 third line segment 223 second coupling metal piece 321 ground end electrode 11