TWI860767B - A wideband and compact mimo antenna unit - Google Patents

A broadband and compact MIMO antenna unit comprises a main radiation antenna, a first parasitic radiation element and a second parasitic radiation element. The main radiating antenna includes a main radiation patch, a ground plane, a short circuit pin, a first feed pin, a first signal port, a second feed pin and a second signal port. The main radiation patch is arranged parallel to the ground plane, and the main radiation patch has a short circuit point, a first feed point and a second feed point, the short circuit point is located in a geometric center of the main radiation patch, the short circuit pin is electrically connected to the geometric center of the main radiation patch and the ground plane, the first feed pin is electrically connected between the first feed point and the first signal port, the second feed pin is electrically connected between the second feed point and the second signal port. The first parasitic radiation element, separated from the main radiation antenna at intervals, is arranged adjacent to the main radiation patch to couple an electromagnetic radiated energy from the first signal port and resonate. The second parasitic radiation element, separated from the main radiating antenna at intervals, is arranged adjacent to the main radiation patch to couple another electromagnetic radiated energy from the second signal port and resonate.

寬頻縮小化的多輸入多輸出天線單元 Wideband miniaturized multiple-input multiple-output antenna unit

本發明是關於一種天線，特別是用於多輸入多輸出通訊的寬頻縮小化天線。 The present invention relates to an antenna, in particular a broadband miniaturized antenna for multiple-input multiple-output communications.

參閱圖1，傳統的多輸入多輸出(Multiple-Input and Multiple-Output,MIMO)無線通訊是利用M個輸入天線與N個輸出天線之間形成的M×N通道提升整體通訊的傳輸量，其中，參數M、N為大於1的正整數。 Refer to Figure 1. Traditional Multiple-Input and Multiple-Output (MIMO) wireless communication uses M×N channels formed by M input antennas and N output antennas to increase the overall communication throughput, where the parameters M and N are positive integers greater than 1.

圖2是一種多輸入多輸出天線單元100，包含兩個平板天線01，每一個平板天線01是以電容耦合02的方式進行訊號饋入，所謂的電容耦合02就是天線訊號饋入點03與輻射片04之間具有一個斷開的非導體間隔05，使得在直流訊號量測時該天線訊號饋入點03與輻射片04之間不導通，然而，在例如WiFi頻段時，該非導體間隔05則可視為一個串聯在天線訊號饋入點03與輻射片04之間的等效電容，而該等效電容還可以抵銷相對應的一饋線06所造成的等效電感，進而達到該平板天線01的阻抗匹配，通常，所謂的阻抗匹配是指該平板天線01在其共振頻率點處的輸入/輸出阻抗實部是50歐姆，虛部為0歐姆。在圖2的範例中是以兩個平板天線作為示意，然而，實際應用當然可以依此規則複製擴增數量達到如圖1所示M×N的態樣。 FIG. 2 shows a multi-input multi-output antenna unit 100, which includes two flat antennas 01. Each flat antenna 01 is fed with signals by capacitive coupling 02. The so-called capacitive coupling 02 is that there is a disconnected non-conductive spacer 05 between the antenna signal feeding point 03 and the radiating plate 04, so that the antenna signal feeding point 03 and the radiating plate 04 are not conductive when measuring DC signals. However, in the case of, for example, WiFi In the i frequency band, the non-conductive spacer 05 can be regarded as an equivalent capacitor connected in series between the antenna signal feed point 03 and the radiation plate 04, and the equivalent capacitor can also offset the equivalent inductance caused by the corresponding feed line 06, thereby achieving impedance matching of the flat antenna 01. Usually, the so-called impedance matching means that the real part of the input/output impedance of the flat antenna 01 at its resonant frequency point is 50 ohms, and the imaginary part is 0 ohms. In the example of Figure 2, two flat antennas are used as an example. However, in actual applications, the number of expansions can be copied according to this rule to achieve the M×N state shown in Figure 1.

這種傳統的多輸入多輸出天線單元100的缺點在於： The disadvantages of this traditional MIMO antenna unit 100 are:

(1).M個輸入天線就代表需要M個該平板天線01，導致整體面積太大。 (1). M input antennas mean that M flat antennas 01 are required, which results in a large overall area.

(2).每一個該平板天線01是半波長共振，面積也大。 (2). Each of the flat antennas 01 is half-wavelength resonant and has a large area.

因此，本申請提出一種寬頻縮小化的多輸入多輸出天線單元以解決上述的兩個問題。 Therefore, this application proposes a broadband miniaturized multi-input multi-output antenna unit to solve the above two problems.

本發明的較佳實施例提出了一種寬頻縮小化的多輸入多輸出天線單元包含一主輻射天線、一第一寄生輻射元件、一第二寄生輻射元件及一第三寄生輻射元件。 The preferred embodiment of the present invention proposes a broadband miniaturized multi-input multi-output antenna unit comprising a main radiation antenna, a first parasitic radiation element, a second parasitic radiation element and a third parasitic radiation element.

該主輻射天線包括一主輻射片、一接地面、一短路針、一第一饋針、第一訊號埠、一第二饋針、一第二訊號埠、一第三饋針及一第三訊號埠。 The main radiating antenna includes a main radiating plate, a ground plane, a short-circuit pin, a first feed pin, a first signal port, a second feed pin, a second signal port, a third feed pin and a third signal port.

該主輻射片是一正三角形並與該接地面平行間隔排列，且該主輻射片具有一短路點、一第一饋點、一第二饋點及一第三饋點。 The main radiator is an equilateral triangle and is arranged parallel to and spaced from the ground plane. The main radiator has a short-circuit point, a first feed point, a second feed point, and a third feed point.

該短路點位於該主輻射片的一幾何中心，該短路針電連接該主輻射片的幾何中心及該接地面，該第一饋針電連接於該第一饋點及該第一訊號埠之間，該第二饋針電連接於該第二饋點及該第二訊號埠之間，該第三饋針電連接於該第三饋點及該第三訊號埠之間。 The short-circuit point is located at a geometric center of the main radiator. The short-circuit pin is electrically connected to the geometric center of the main radiator and the ground plane. The first feed pin is electrically connected between the first feed point and the first signal port. The second feed pin is electrically connected between the second feed point and the second signal port. The third feed pin is electrically connected between the third feed point and the third signal port.

定義通過該短路點與該第一饋點的一虛擬直線為一第一極化方向線，定義通過該短路點與該第二饋點的一虛擬直線為一第二極化方向線，定義通過該短路點與該第三饋點的一虛擬直線為一第三極化方向線，且該第一極化方向線、該第二極化方向線與該第三極化方向線這三者中任兩者的一夾角都是120度。 A virtual straight line passing through the short-circuit point and the first feed point is defined as a first polarization direction line, a virtual straight line passing through the short-circuit point and the second feed point is defined as a second polarization direction line, and a virtual straight line passing through the short-circuit point and the third feed point is defined as a third polarization direction line, and the angle between any two of the first polarization direction line, the second polarization direction line and the third polarization direction line is 120 degrees.

該第一寄生輻射元件、該第二寄生輻射元件及該第三寄生輻射元件是分別鄰近正三角形的該主輻射片的三個等長邊。 The first parasitic radiation element, the second parasitic radiation element and the third parasitic radiation element are three equal-length sides of the main radiation sheet respectively adjacent to an equilateral triangle.

該第一寄生輻射元件與該主輻射天線的主輻射片間隔鄰近排列，以耦合來自該第一訊號埠的一電磁輻射能量並產生共振。該第二寄生輻射元件與該主輻射天線的主輻射片間隔鄰近排列，以耦合來自該第二訊號埠的另一電磁輻射能量並產生共振。該第三寄生輻射元件與該主輻射天線的主輻射片間隔鄰近排列，以耦合來自該第三訊號埠的再另一電磁輻射能量並產生共振。 The first parasitic radiation element is arranged adjacent to the main radiation plate of the main radiation antenna to couple an electromagnetic radiation energy from the first signal port and generate resonance. The second parasitic radiation element is arranged adjacent to the main radiation plate of the main radiation antenna to couple another electromagnetic radiation energy from the second signal port and generate resonance. The third parasitic radiation element is arranged adjacent to the main radiation plate of the main radiation antenna to couple another electromagnetic radiation energy from the third signal port and generate resonance.

更詳細的說明，該第一寄生輻射元件具有一第一金屬底面、一第一直立金屬面及一第二直立金屬面，該第一金屬底面與該主輻射片在空間中共平面並間隔設置，該第一直立金屬面相對該第二直立金屬面鄰近該主輻射片，且該第一直立金屬面及該第二直立金屬面從該第一金屬底面的兩相反側朝遠離該接地面的方向延伸而出，該第一直立金屬面及該第二直立金屬面兩者均垂直該第一金屬底面。該第二寄生輻射元件具有一第二金屬底面、一第三直立金屬面及一第四直立金屬面，該第二金屬底面與該主輻射片在空間中共平面並間隔設置，該第三直立金屬面相對該第四直立金屬面鄰近該主輻射片，且該第三直立金屬面及該第四直立金屬面從該第二金屬底面的兩相反側朝遠離該接地面的方向延伸而出，該第三直立金屬面及該第四直立金屬面兩者均垂直該第二金屬底面。該第三寄生輻射元件具有一第三金屬底面、一第五直立金屬面及一第六直立金屬面，該第三金屬底面與該主輻射片在空間中共平面並間隔設置，該第五直立金屬面相對該第六直立金屬面鄰近該主輻射片，且該第五直立金屬面及該第六直立金屬面從該第三金屬底面的兩相反側朝遠離該接地面的方向延伸而出，該第五直立金屬面及該第六直立金屬面兩者均垂直該第三金屬底面。 In more detail, the first parasitic radiation element has a first metal bottom surface, a first upright metal surface and a second upright metal surface. The first metal bottom surface and the main radiation sheet are coplanar in space and are spaced apart. The first upright metal surface is adjacent to the main radiation sheet relative to the second upright metal surface, and the first upright metal surface and the second upright metal surface extend from two opposite sides of the first metal bottom surface in a direction away from the ground plane. Both the first upright metal surface and the second upright metal surface are perpendicular to the first metal bottom surface. The second parasitic radiation element has a second metal bottom surface, a third vertical metal surface and a fourth vertical metal surface. The second metal bottom surface and the main radiation sheet are coplanar in space and are spaced apart. The third vertical metal surface is adjacent to the main radiation sheet relative to the fourth vertical metal surface. The third vertical metal surface and the fourth vertical metal surface extend from two opposite sides of the second metal bottom surface in a direction away from the ground plane. Both the third vertical metal surface and the fourth vertical metal surface are perpendicular to the second metal bottom surface. The third parasitic radiation element has a third metal bottom surface, a fifth vertical metal surface and a sixth vertical metal surface. The third metal bottom surface and the main radiation sheet are coplanar and spaced in space. The fifth vertical metal surface is adjacent to the main radiation sheet relative to the sixth vertical metal surface. The fifth vertical metal surface and the sixth vertical metal surface extend from two opposite sides of the third metal bottom surface in a direction away from the ground plane. Both the fifth vertical metal surface and the sixth vertical metal surface are perpendicular to the third metal bottom surface.

該第一寄生輻射元件、該第二寄生輻射元件及該第三寄生輻射元件三者的形狀及大小相同，該第一直立金屬面、該第三直立金屬面及該第五直立金屬面三者的大小同，該第二直立金屬面、該第四直立金屬面及該第六直立金屬面三者的大小同，該第一直立金屬面與該第二直立金屬面都是長方形，且該第一直立金屬面與該第二直立金屬面的長度相等，該第一直立金屬面的高度小於該第二直立金屬面的高度。 The first parasitic radiation element, the second parasitic radiation element and the third parasitic radiation element are of the same shape and size, the first upright metal surface, the third upright metal surface and the fifth upright metal surface are of the same size, the second upright metal surface, the fourth upright metal surface and the sixth upright metal surface are of the same size, the first upright metal surface and the second upright metal surface are both rectangular, and the lengths of the first upright metal surface and the second upright metal surface are equal, and the height of the first upright metal surface is less than the height of the second upright metal surface.

上述的實施例是以該主輻射片為正三角形作為說明，然而，該主輻射片也可以是一正方形或一圓形。 The above embodiment is explained with the main radiation plate being an equilateral triangle, however, the main radiation plate can also be a square or a circle.

本發明的效果在於： The effects of the present invention are:

(1).單一個主輻射片電連接複數個訊號埠(第一訊號埠、第二訊號埠、第三訊號埠)，因此先前技術需要M個該平板天線而導致整體面積太大的問題可以得到解決。 (1). A single main radiator is electrically connected to multiple signal ports (first signal port, second signal port, third signal port), so the problem that the previous technology requires M flat antennas and causes the overall area to be too large can be solved.

(2).三角形的該主輻射片的任意一個頂點到該主輻射片的幾何中心的距離S為近似四分之一波長共振，S<2×L，因此三角形的該主輻射片相對圖2先前技術的該平板天線更節省面積，因此具有縮小化的功用。 (2). The distance S from any vertex of the triangular main radiator to the geometric center of the main radiator is approximately a quarter-wave resonance, S<2×L. Therefore, the triangular main radiator saves more area than the flat antenna of the prior art in Figure 2, and thus has the function of miniaturization.

(3).基於前述，縮小化省下的面積可以加入該第一寄生輻射元件、該第二寄生輻射元件及該第三寄生輻射元件，進而提升天線的頻寬。 (3). Based on the above, the area saved by miniaturization can be used to add the first parasitic radiation element, the second parasitic radiation element and the third parasitic radiation element, thereby increasing the bandwidth of the antenna.

01:平板天線 01: Flat antenna

02:電容耦合 02: Capacitive coupling

03:天線訊號饋入點 03: Antenna signal feed point

04:輻射片 04: Radiation film

05:非導體間隔 05: Non-conductive spacer

06:饋線 06: Feedback

1:第一寄生輻射元件 1: The first parasitic radiation element

11:第一直立金屬面 11: The first vertical metal surface

12:第二直立金屬面 12: Second vertical metal surface

13:第一金屬底面 13: First metal bottom surface

2:第二寄生輻射元件 2: Second parasitic radiation element

21:第二金屬底面 21: Second metal bottom surface

23:第三直立金屬面 23: The third vertical metal surface

24:第四直立金屬面 24: The fourth vertical metal surface

3:第三寄生輻射元件 3: The third parasitic radiation element

31:第三金屬底面 31: The third metal bottom surface

35:第五直立金屬面 35: The fifth vertical metal surface

36:第六直立金屬面 36: Sixth vertical metal surface

4:主輻射天線 4: Main radiating antenna

41:主輻射片 41: Main radiation sheet

411:第一饋點 411: First Feedback

412:第二饋點 412: Second Feedback

413:第三饋點 413: The third feedback

414:短路點 414: Short circuit point

42:接地面 42: Ground contact surface

43:短路針 43: Short-circuit pin

44:第一饋針 44: The first feeding

45:第一訊號埠 45: First signal port

46:第二饋針 46: Second Feedback

47:第二訊號埠 47: Second signal port

48:第三饋針 48: The third feeding

49:第三訊號埠 49: The third signal port

P1:第一極化方向線 P1: First polarization direction line

P2:第二極化方向線 P2: Second polarization direction line

P3:第三極化方向線 P3: The third polarization direction line

H1、H2:高度 H1, H2: height

S、L:距離 S, L: distance

〔圖1〕是傳統多輸入多輸出無線通訊系統的示意圖。 [Figure 1] is a schematic diagram of a traditional multiple-input multiple-output wireless communication system.

〔圖2〕是一種傳統的多輸入多輸出天線單元的示意圖。 [Figure 2] is a schematic diagram of a traditional multiple-input multiple-output antenna unit.

〔圖3〕是本發明一種寬頻縮小化的多輸入多輸出天線單元的第一較佳實施例的示意圖。 [Figure 3] is a schematic diagram of a first preferred embodiment of a broadband-miniaturized multi-input multi-output antenna unit of the present invention.

〔圖4〕是第一較佳實施例的部分示意圖，說明第一至第三極化方向線。 [Figure 4] is a partial schematic diagram of the first preferred embodiment, illustrating the first to third polarization direction lines.

〔圖5〕是第一較佳實施例的S11、S22、S33參數圖。 [Figure 5] is the S11, S22, S33 parameter diagram of the first preferred embodiment.

〔圖6〕是第一較佳實施例的隔離度參數圖。 [Figure 6] is an isolation parameter diagram of the first preferred embodiment.

〔圖7〕是第一較佳實施例從第一至第三訊號埠模擬得到的輻射增益圖。 [Figure 7] is the radiation gain diagram obtained by simulating the first to third signal ports of the first preferred embodiment.

〔圖8〕是第一較佳實施例從第一至第三訊號埠模擬得到的輻射效率圖。 [Figure 8] is a diagram of the radiation efficiency obtained by simulating the first to third signal ports of the first preferred embodiment.

〔圖9〕是第一較佳實施例工作在6GHz的輻射場型圖。 [Figure 9] is the radiation field diagram of the first preferred embodiment working at 6 GHz.

〔圖10〕是第一較佳實施例工作在7GHz的輻射場型圖。 [Figure 10] is the radiation field diagram of the first preferred embodiment working at 7 GHz.

〔圖11〕是本發明的第二較佳實施例，說明主輻射片也可以是圓形。 [Figure 11] is the second preferred embodiment of the present invention, illustrating that the main radiation sheet can also be circular.

參閱圖3，本發明一種寬頻縮小化的多輸入多輸出天線單元的第一較佳實施例包含一主輻射天線4、一第一寄生輻射元件1、一第二寄生輻射元件2及一第三寄生輻射元件3。 Referring to FIG. 3 , a first preferred embodiment of a broadband miniaturized multi-input multi-output antenna unit of the present invention comprises a main radiation antenna 4, a first parasitic radiation element 1, a second parasitic radiation element 2 and a third parasitic radiation element 3.

該主輻射天線4包括一主輻射片41、一接地面42、一短路針43、一第一饋針44、一第一訊號埠45、一第二饋針46、一第二訊號埠47、一第三饋針48、一第三訊號埠49。 The main radiating antenna 4 includes a main radiating plate 41, a ground plane 42, a short-circuit pin 43, a first feed pin 44, a first signal port 45, a second feed pin 46, a second signal port 47, a third feed pin 48, and a third signal port 49.

該主輻射片41是一正三角形並與該接地面42平行間隔排列，且該主輻射片41具有一短路點414、一第一饋點411、一第二饋點412及一第三饋點413。 The main radiator 41 is an equilateral triangle and is arranged parallel to and spaced from the ground plane 42. The main radiator 41 has a short-circuit point 414, a first feed point 411, a second feed point 412, and a third feed point 413.

該短路點414位於該主輻射片41的一幾何中心，該短路針43電連接該主輻射片41的幾何中心(也就是該短路點414)及該接地面42，該第一饋針44 電連接於該第一饋點411及該第一訊號埠45之間，該第二饋針46電連接於該第二饋點412及該第二訊號埠47之間，該第三饋針48電連接於該第三饋點413及該第三訊號埠49之間。 The short-circuit point 414 is located at a geometric center of the main radiating plate 41. The short-circuit pin 43 electrically connects the geometric center of the main radiating plate 41 (i.e., the short-circuit point 414) and the ground plane 42. The first feedback pin 44 is electrically connected between the first feedback point 411 and the first signal port 45. The second feedback pin 46 is electrically connected between the second feedback point 412 and the second signal port 47. The third feedback pin 48 is electrically connected between the third feedback point 413 and the third signal port 49.

參閱圖4，定義通過該短路點414與該第一饋點411的一虛擬直線為一第一極化方向線P1；定義通過該短路點414與該第二饋點412的一虛擬直線為一第二極化方向線P2；定義通過該短路點414與該第三饋點413的一虛擬直線為一第三極化方向線P3；且該第一極化方向線P1、該第二極化方向線P2與該第三極化方向線P3這三者中任兩者的一夾角都是120度。 Referring to FIG. 4 , a virtual straight line passing through the short-circuit point 414 and the first feed point 411 is defined as a first polarization direction line P1; a virtual straight line passing through the short-circuit point 414 and the second feed point 412 is defined as a second polarization direction line P2; a virtual straight line passing through the short-circuit point 414 and the third feed point 413 is defined as a third polarization direction line P3; and the angle between any two of the first polarization direction line P1, the second polarization direction line P2 and the third polarization direction line P3 is 120 degrees.

回歸參閱圖3，該第一寄生輻射元件1、該第二寄生輻射元件2及該第三寄生輻射元件3是分別鄰近正三角形的該主輻射片41的三個等長邊。 Referring back to FIG. 3 , the first parasitic radiation element 1 , the second parasitic radiation element 2 , and the third parasitic radiation element 3 are three equal-length sides of the main radiation plate 41 that are adjacent to the regular triangle.

該第一寄生輻射元件1與該主輻射天線4的主輻射片41間隔鄰近排列，以耦合來自該第一訊號埠45的一電磁輻射能量並產生共振。該第二寄生輻射元件2與該主輻射天線4的主輻射片41間隔鄰近排列，以耦合來自該第二訊號埠47的另一電磁輻射能量並產生共振。該第三寄生輻射元件3與該主輻射天線4的主輻射片41間隔鄰近排列，以耦合來自該第三訊號埠49的又另一電磁輻射能量並產生共振。 The first parasitic radiation element 1 is arranged adjacent to the main radiation plate 41 of the main radiation antenna 4 to couple an electromagnetic radiation energy from the first signal port 45 and generate resonance. The second parasitic radiation element 2 is arranged adjacent to the main radiation plate 41 of the main radiation antenna 4 to couple another electromagnetic radiation energy from the second signal port 47 and generate resonance. The third parasitic radiation element 3 is arranged adjacent to the main radiation plate 41 of the main radiation antenna 4 to couple another electromagnetic radiation energy from the third signal port 49 and generate resonance.

更詳細的說明，該第一寄生輻射元件1具有一第一金屬底面13、一第一直立金屬面11及一第二直立金屬面12，該第一金屬底面13與該主輻射片41在空間中共平面並間隔設置，該第一直立金屬面11相對該第二直立金屬面12鄰近該主輻射片41，且該第一直立金屬面11及該第二直立金屬面12從該第一金屬底面13的兩相反側朝遠離該接地面42的方向延伸而出，該第一直立金屬面11及該第二直立金屬面12兩者均垂直該第一金屬底面13。該第二寄生輻射元件2具 有一第二金屬底面21、一第三直立金屬面23及一第四直立金屬面24，該第二金屬底面21與該主輻射片41在空間中共平面並間隔設置，該第三直立金屬面23相對該第四直立金屬面24鄰近該主輻射片41，且該第三直立金屬面23及該第四直立金屬面24從該第二金屬底面21的兩相反側朝遠離該接地面42的方向延伸而出，該第三直立金屬面23及該第四直立金屬面24兩者均垂直該第二金屬底面21。該第三寄生輻射元件3具有一第三金屬底面31、一第五直立金屬面35及一第六直立金屬面36，該第三金屬底面31與該主輻射片41在空間中共平面並間隔設置，該第五直立金屬面35相對該第六直立金屬面36鄰近該主輻射片41，且該第五直立金屬面35及該第六直立金屬面36從該第三金屬底面31的兩相反側朝遠離該接地面42的方向延伸而出，該第五直立金屬面35及該第六直立金屬面36兩者均垂直該第三金屬底面31。 In more detail, the first parasitic radiation element 1 has a first metal bottom surface 13, a first upright metal surface 11 and a second upright metal surface 12. The first metal bottom surface 13 and the main radiation plate 41 are coplanar in space and are arranged at intervals. The first upright metal surface 11 is adjacent to the main radiation plate 41 relative to the second upright metal surface 12, and the first upright metal surface 11 and the second upright metal surface 12 extend from two opposite sides of the first metal bottom surface 13 in a direction away from the ground plane 42. Both the first upright metal surface 11 and the second upright metal surface 12 are perpendicular to the first metal bottom surface 13. The second parasitic radiation element 2 has a second metal bottom surface 21, a third upright metal surface 23 and a fourth upright metal surface 24. The second metal bottom surface 21 and the main radiation plate 41 are coplanar and spaced apart in space. The third upright metal surface 23 is adjacent to the main radiation plate 41 relative to the fourth upright metal surface 24. The third upright metal surface 23 and the fourth upright metal surface 24 extend from two opposite sides of the second metal bottom surface 21 in a direction away from the ground plane 42. The third upright metal surface 23 and the fourth upright metal surface 24 are both perpendicular to the second metal bottom surface 21. The third parasitic radiation element 3 has a third metal bottom surface 31, a fifth vertical metal surface 35 and a sixth vertical metal surface 36. The third metal bottom surface 31 and the main radiation plate 41 are coplanar and spaced in space. The fifth vertical metal surface 35 is adjacent to the main radiation plate 41 relative to the sixth vertical metal surface 36. The fifth vertical metal surface 35 and the sixth vertical metal surface 36 extend from two opposite sides of the third metal bottom surface 31 in a direction away from the ground plane 42. Both the fifth vertical metal surface 35 and the sixth vertical metal surface 36 are perpendicular to the third metal bottom surface 31.

該第一寄生輻射元件1、該第二寄生輻射元件2及該第三寄生輻射元件3三者的形狀及大小相同，該第一直立金屬面11、該第三直立金屬面23及該第五直立金屬面35三者的大小同，該第二直立金屬面12、該第四直立金屬面24及該第六直立金屬面36三者的大小同，該第一直立金屬面11與該第二直立金屬面12都是長方形，且該第一直立金屬面11與該第二直立金屬面12的長度相等，該第一直立金屬面11的高度H1小於該第二直立金屬面12的高度H2，較佳的，H1/H2

3/5。 The first parasitic radiation element 1, the second parasitic radiation element 2 and the third parasitic radiation element 3 are of the same shape and size, the first upright metal surface 11, the third upright metal surface 23 and the fifth upright metal surface 35 are of the same size, the second upright metal surface 12, the fourth upright metal surface 24 and the sixth upright metal surface 36 are of the same size, the first upright metal surface 11 and the second upright metal surface 12 are both rectangular, and the lengths of the first upright metal surface 11 and the second upright metal surface 12 are equal, the height H1 of the first upright metal surface 11 is less than the height H2 of the second upright metal surface 12, preferably, H1/H2

3/5.

參閱圖5，是第一較佳實施例的S11、S22、S33參數圖，三條曲線S11、S22、S33分別代表從該第一訊號埠45、該第二訊號埠47及該第三訊號埠49模擬得到的數據，以曲線S11為例說明，該S11曲線呈現兩個相鄰的共振模態，其中一個共振模態是該主輻射片41共振產生，且此時該主輻射片41上的電場主極 化方向平行該第一極化方向線P1(見圖4)，而另一個共振模態則是第一寄生輻射元件1因耦合來自該主輻射片41共振產生。同理，該S22曲線也呈現兩個相鄰的共振模態，其中一個共振模態是該主輻射片41共振產生，且此時該主輻射片41上的電場主極化方向平行該第二極化方向線P2(見圖4)，另一個共振模態則是該第二寄生輻射元件2因耦合來自該主輻射片41共振產生；該S33曲線也呈現兩個相鄰的共振模態，其中一個共振模態是該主輻射片41共振產生，且此時該主輻射片41上的電場主極化方向平行該第三極化方向線P3(見圖4)，另一個共振模態則是該第三寄生輻射元件3因耦合來自該主輻射片41共振產生。而正是因為本實施例的該第一至第三極化方向線P1、P2、P3中的任兩者呈現120度的夾角，因此可以提升該第一至第三訊號埠45、47、49之間的隔離度(見圖6)，使得單一的該主輻射片41可以同時被該第一至第三訊號埠45、47、49共用，進而減少本較佳實施例的面積。 Referring to FIG. 5 , it is a parameter diagram of S11, S22, and S33 of the first preferred embodiment. The three curves S11, S22, and S33 represent the data obtained by simulating the first signal port 45, the second signal port 47, and the third signal port 49, respectively. Taking curve S11 as an example, the S11 curve presents two adjacent resonance modes, one of which is generated by the resonance of the main radiation plate 41, and at this time, the main polarization direction of the electric field on the main radiation plate 41 is parallel to the first polarization direction line P1 (see FIG. 4 ), and the other resonance mode is generated by the first parasitic radiation element 1 due to the coupling from the resonance of the main radiation plate 41. Similarly, the S22 curve also presents two adjacent resonance modes, one of which is generated by the resonance of the main radiation plate 41, and at this time the main polarization direction of the electric field on the main radiation plate 41 is parallel to the second polarization direction line P2 (see FIG. 4 ), and the other resonance mode is generated by the resonance of the second parasitic radiation element 2 due to coupling from the main radiation plate 41; the S33 curve also presents two adjacent resonance modes, one of which is generated by the resonance of the main radiation plate 41, and at this time the main polarization direction of the electric field on the main radiation plate 41 is parallel to the third polarization direction line P3 (see FIG. 4 ), and the other resonance mode is generated by the resonance of the third parasitic radiation element 3 due to coupling from the main radiation plate 41. Because any two of the first to third polarization direction lines P1, P2, P3 of this embodiment present an angle of 120 degrees, the isolation between the first to third signal ports 45, 47, 49 can be improved (see Figure 6), so that the single main radiation plate 41 can be shared by the first to third signal ports 45, 47, 49 at the same time, thereby reducing the area of the preferred embodiment.

圖7是該第一較佳實施例從該第一訊號埠45、該第二訊號埠47及該第三訊號埠49模擬得到的輻射增益圖，從中可以知道對應圖5中5.4~7.5GHz的阻抗頻寬範圍內具有大於4dBi的良好輻射增益。 FIG7 is a radiation gain diagram obtained by simulating the first signal port 45, the second signal port 47 and the third signal port 49 of the first preferred embodiment, from which it can be seen that the impedance bandwidth range of 5.4~7.5GHz corresponding to FIG5 has a good radiation gain greater than 4dBi.

圖8是該第一較佳實施例從該第一訊號埠45、該第二訊號埠47及該第三訊號埠49模擬得到的輻射效率圖，從中可以知道對應圖5中5.4~7.5GHz的阻抗頻寬範圍內具有大於63%的良好輻射效率。 FIG8 is a diagram of the radiation efficiency obtained by simulating the first signal port 45, the second signal port 47 and the third signal port 49 of the first preferred embodiment, from which it can be seen that the impedance bandwidth range of 5.4~7.5GHz corresponding to FIG5 has a good radiation efficiency greater than 63%.

圖9是該第一較佳實施例工作在6GHz的輻射場型圖，而圖10則是該第一較佳實施例工作在7GHz的輻射場型圖，從中可以知道該第一訊號埠45、該第二訊號埠47及該第三訊號埠49的任一者都是垂向輻射(broadside radiation patterns)。 FIG. 9 is a radiation pattern diagram of the first preferred embodiment operating at 6 GHz, and FIG. 10 is a radiation pattern diagram of the first preferred embodiment operating at 7 GHz, from which it can be seen that any of the first signal port 45, the second signal port 47 and the third signal port 49 are vertical radiation (broadside radiation patterns).

圖11是本發明的第二較佳實施例，其與第一較佳實施例近似，差異在於該第一較佳實施例是以正三角形的該主輻射片41為作為說明，然而，該主輻射片41也可以如第二較佳實施例所示的圓形取代。 FIG. 11 is the second preferred embodiment of the present invention, which is similar to the first preferred embodiment, except that the first preferred embodiment uses the main radiation plate 41 of an equilateral triangle as an illustration, however, the main radiation plate 41 can also be replaced by a circular shape as shown in the second preferred embodiment.

本發明的效果在於： The effects of the present invention are:

(1).單一個主輻射片41電連接複數個該第一訊號埠45、該第二訊號埠47及該第三訊號埠49，因此先前技術需要M個該平板天線而導致整體面積太大的問題可以得到解決。 (1). A single main radiating plate 41 is electrically connected to a plurality of the first signal ports 45, the second signal port 47 and the third signal port 49, so the problem that the prior art requires M flat antennas and causes the overall area to be too large can be solved.

(2).三角形的該主輻射片41的任意一個頂點到該主輻射片41的幾何中心的距離S為近似四分之一波長共振，S<2×L(見圖4)，因此三角形的該主輻射片41相對圖2先前技術的該平板天線更節省面積，因此具有縮小化的功用。 (2). The distance S from any vertex of the triangular main radiating plate 41 to the geometric center of the main radiating plate 41 is approximately a quarter-wave resonance, S<2×L (see FIG. 4 ). Therefore, the triangular main radiating plate 41 saves more area than the flat antenna of the prior art in FIG. 2 , and thus has the function of miniaturization.

(3).基於前述，縮小化省下的面積可以加入該第一寄生輻射元件1、該第二寄生輻射元件2及該第三寄生輻射元件3，進而提升天線的頻寬(圖5)。 (3). Based on the above, the area saved by miniaturization can be used to add the first parasitic radiation element 1, the second parasitic radiation element 2 and the third parasitic radiation element 3, thereby increasing the bandwidth of the antenna (Figure 5).

惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，凡是依本發明申請專利範圍及專利說明書內容所作之簡單地等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。 However, the above is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still within the scope of the present invention.

1:第一寄生輻射元件 1: The first parasitic radiation element

11:第一直立金屬面 11: The first vertical metal surface

12:第二直立金屬面 12: Second vertical metal surface

13:第一金屬底面 13: First metal bottom surface

2:第二寄生輻射元件 2: Second parasitic radiation element

21:第二金屬底面 21: Second metal bottom surface

23:第三直立金屬面 23: The third vertical metal surface

24:第四直立金屬面 24: The fourth vertical metal surface

3:第三寄生輻射元件 3: The third parasitic radiation element

31:第三金屬底面 31: The third metal bottom surface

35:第五直立金屬面 35: The fifth vertical metal surface

36:第六直立金屬面 36: Sixth vertical metal surface

4:主輻射天線 4: Main radiating antenna

41:主輻射片 41: Main radiation sheet

411:第一饋點 411: First Feedback

412:第二饋點 412: Second Feedback

413:第三饋點 413: The third feedback

414:短路點 414: Short circuit point

42:接地面 42: Ground contact surface

43:短路針 43: Short-circuit pin

44:第一饋針 44: The first feeding

45:第一訊號埠 45: First signal port

46:第二饋針 46: Second Feedback

47:第二訊號埠 47: Second signal port

48:第三饋針 48: The third feeding

49:第三訊號埠 49: The third signal port