WO2018171229A1

WO2018171229A1 - Balun circuit structure with bridge structure antenna

Info

Publication number: WO2018171229A1
Application number: PCT/CN2017/111485
Authority: WO
Inventors: 曲美君; 邓力; 李书芳; 张贯京; 葛新科; 高伟明; 张红治
Original assignee: 深圳市景程信息科技有限公司
Priority date: 2017-03-18
Filing date: 2017-11-17
Publication date: 2018-09-27
Also published as: CN107046171A

Abstract

The present invention provides a balun circuit structure with a bridge structure antenna. The balun circuit structure comprises a wideband balun circuit and a bridge antenna. The bridge antenna comprises an antenna substrate, an antenna patch attached to the upper surface of the antenna substrate, and two metal posts which penetrate through the antenna substrate and are connected to the antenna patch; the wideband balun structure comprises a balun substrate, a first metal part attached to the upper surface of the balun substrate, and a second metal part attached to the lower surface of the balun substrate. The two metal posts are connected to the first metal part; the first metal part is connected to the second metal part. By implementing the present invention, a phase difference between adjacent output ports can be kept stable around 180°, achieving a good phase shift effect between two output ports.

Description

Balun circuit structure with bridge structure antenna

[0001] The present invention relates to the field of communications technologies, and in particular, to a balun circuit structure with a bridge structure antenna.

Background technique

[0002] For reasons such as power supply (and other common mode) noise immunity, even harmonic distortion cancellation, DC offset term elimination, increased dynamic range due to swing on both outputs For other reasons, wideband DC-coupled amplifiers are typically designed with differential inputs and outputs. For interconnects between a small chip, a package, or even an amplifier on a board, the cost of a differential interconnect is small compared to the advantages of a differential design. However, the cost of differential interconnects is often very high for interconnects between modules, such as the interconnection between active probes and oscilloscopes. Not only do two coaxial cables be needed instead of one (increasing cost and size and reducing flexibility), but the two coaxial cables also need to be tightly matched to prevent mode switching from differential mode to common mode and from common mode to differential mode. Mode conversion.

[0003] Various passive interconnect structures that are known to convert between single-ended signals and differential signals are often referred to as "baluns" in terrestrial applications and/or are often referred to in frequency domain applications. "180° hybrid". The wideband DC-coupled passive balun is limited by a loss of at least 3 dB because there is no energy on the DC that can be coupled to a capacitive or inductive coupling to the "reverse" output, and thus half of the single-ended input power behaves as a differential The "wasted" common mode energy on the output.

[0004] Typically, baluns are designed for RF applications with little or no consideration for the transient response of the balun. The transient response in such devices can have considerable pre-shoot or pre-shoot and over shoot. However, in some applications, such as signal acquisition systems with differential signal acquisition probes coupled to an oscilloscope, the phase difference between adjacent ports in an existing balun design is unstable and cannot be stabilized around 180°. Moreover, the phase shifting effect is poor, which reduces the stability of the communication signal and is not conducive to signal transmission between communication devices.

technical problem

[0005] The main object of the present invention is to provide a balun circuit structure with a bridge structure antenna, which aims to solve the technical problem that the phase difference between adjacent ports in the prior art is unstable and the phase shifting effect is poor. Problem solution

Technical solution

[0004] In order to achieve the above object, the present invention provides a balun circuit structure with a bridge structure antenna, the balun circuit structure including a broadband balun structure and a bridge antenna;

[0007] The bridge antenna includes an antenna substrate, an antenna patch attached to an upper surface of the antenna substrate, and two metal posts penetrating the antenna substrate and connected to the antenna patch;

[0008] The broadband balun structure includes a balun substrate, and a first metal portion attached to an upper surface of the balun substrate

a second metal portion attached to a lower surface of the balun substrate;

[0009] The first metal portion is a tower structure, and comprises a tower body formed by stacking a plurality of metal sheets and a tower base composed of two base metal sheets on the left and right sides of the tower body, except for the top joint metal at the top of the tower body. Other metal sheets constituting the tower body outside the sheet are provided with slits, and each of the slits is further provided with a blocking resistor, and one of the base metal sheets in the tower base is provided with a connecting region;

[0010] a metal post of the bridge antenna is vertically connected to an end of a base metal piece of the first metal portion, and another metal post of the bridge antenna is vertically connected to the first metal The end of another base metal piece of the part;

[0011] the second metal portion includes a rectangular parallelepiped and a concave protruding portion located at a side of the rectangular parallelepiped protruding portion, and the connecting portion is disposed in the concave protruding portion;

[0012] a through hole is disposed in the balun substrate, and an electrical connection portion is disposed in the through hole, wherein the through hole corresponds to a connection region of one of the base metal pieces in the tower base and a connection region in the concave protrusion portion The electrical connection portion is connected to a connection region of the first metal portion and a connection region of the second metal portion.

[0013] Preferably, the first metal portion includes a first isolation resistor, a second isolation resistor, a third isolation resistor, a fourth isolation resistor, a first metal piece, a second metal piece, and a third metal piece. a fourth metal piece, a fifth metal piece, a sixth metal piece, a first base and a second base, wherein the first metal piece, the second metal piece, the third metal piece, the first The four metal pieces, the fifth metal piece and the sixth metal piece are superposed to form a tower body, and the first base and the second base form a tower base.

[0014] Preferably, the first metal piece is a top metal piece and has a rectangular solid structure, and the second metal piece, the third metal piece, the fourth metal piece, the fifth metal piece and The sixth section of the metal piece is rectangular and has a structure inside the slit, the first metal piece, the second piece of metal piece, the third piece of metal piece, The dimensions of the fourth metal piece, the fifth metal piece and the sixth metal piece are enlarged step by step, the first isolation resistor is disposed in the slit of the second metal piece, and the second isolation resistor is disposed on the third metal part In the gap of the chip, the third isolation resistor is disposed in the slit of the fourth metal piece, the fourth isolation resistor is disposed in the slit of the fifth metal piece, and the fifth isolation resistance is disposed in the gap of the sixth metal piece.

[0015] Preferably, the bottom of the first metal piece is connected to the middle of the top of the second metal piece, and the bottom of the second metal piece is connected to the middle of the top of the third piece of metal, the third The bottom of the metal piece is connected to the middle of the top of the fourth metal piece, the bottom of the fourth piece of metal is connected to the middle of the top of the fifth piece of metal, and the bottom of the fifth piece of metal is connected to the sixth section. The middle position of the top of the metal piece.

[0016] Preferably, a first base is disposed on a left side of the sixth metal piece, and a second base is disposed on a right side of the sixth metal piece.

[0017] Preferably, the second base is a metal piece having an arc shape in the middle, wherein the second base comprises a first folded metal piece and a second folded metal piece, the first folded metal piece and the first a birefringent metal sheet joint forms a fold-shaped slit;

[0018] a first connecting area is disposed on the first folded metal piece, and a second connecting area is disposed on the second folded metal piece;

[0019] The first connection area and the second connection area respectively correspond to two through holes of the balun substrate.

[0020] Preferably, the fold gap formed by the connection between the first folded metal piece and the second folded metal piece is a Z-shaped slit

[0021] Preferably, the antenna patch is a "壬"-shaped structure, wherein the "壬"-shaped structure formed by the antenna patch is arranged in parallel in the upper and lower sides, and the "壬"-shaped structure The middle and left sides of the middle are connected to a metal column.

[0022] Preferably, the concave protrusion comprises a first concave metal piece and a second concave metal piece, and the first concave metal piece and the second concave metal piece form a fold gap. A third connecting region is disposed on the first concave metal piece, and a fourth connecting region is disposed on the second concave metal piece, wherein the third connecting region and the fourth connecting region respectively correspond to two through holes of the balun substrate.

[0023] Preferably, the fold gap formed by the connection between the first concave metal piece and the second concave metal piece is a Z-shaped slit. Advantageous effects of the invention

Beneficial effect

[0024] The present invention adopts the above technical solution, and brings the technical effects as follows: The balun circuit structure of the bridge structure antenna of the present invention can stabilize the phase difference between adjacent output ports at 180°, and realizes two Good phase shifting between output ports.

Brief description of the drawing

DRAWINGS

1 is a schematic structural view of a balun circuit structure of a bridge structure antenna according to the present invention;

2 is a schematic structural view of a bridge structure antenna in a balun circuit structure with a bridge structure antenna according to the present invention; [0027] FIG. 3 is a schematic structural diagram of a broadband balun structure in a balun circuit structure of a bridge structure antenna according to the present invention; 4 is a schematic structural view of a preferred embodiment of a first metal portion of the broadband balun structure of FIG. 3 of the present invention; [0029] FIG. 5 is a first metal portion of the broadband balun structure of FIG. 3 of the present invention; a map of a preferred embodiment of each component size;

6 is a schematic structural view of a preferred embodiment of a second base of the first metal portion of the broadband balun structure of FIG. 3 according to the present invention;

7 is a schematic structural view of a preferred embodiment of a second metal portion of the broadband balun structure of FIG. 3 according to the present invention; [0032] FIG. 8 is a concave portion of a second metal portion of the broadband balun structure of FIG. A schematic structural view of a preferred embodiment of a shaped protrusion;

9 is an S-parameter diagram of a preferred embodiment of the present invention for electromagnetically simulating a balun circuit structure with a bridge structure antenna; [0033] FIG.

10 is a schematic diagram of a preferred embodiment of a phase difference between two output ports after electromagnetic simulation of a balun circuit structure with a bridge structure antenna according to the present invention.

[0035] The objects, features, and advantages of the present invention will be further described in conjunction with the embodiments.

BEST MODE FOR CARRYING OUT THE INVENTION

[0007] In order to further illustrate the technical means and functions of the present invention for achieving the intended purpose of the invention, the embodiments, structures, features and functions of the present invention are described below in conjunction with the accompanying drawings and preferred embodiments. , the detailed description is as follows. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1, FIG. 1 is a schematic structural view of a balun circuit structure of a bridge structure antenna according to the present invention.

[0038] The balun circuit structure 8 with the bridge structure antenna includes a broadband balun structure 1 and a bridge antenna 6, wherein

The bridge antenna 6 is bridged to the upper position of the broadband balun structure 1 by two metal posts (i.e., a cylinder vertically disposed on the upper surface of the broadband balun structure 1 in Fig. 1).

Referring to FIG. 2, FIG. 2 is a schematic structural view of a bridge structure antenna in a balun circuit structure with a bridge structure antenna according to the present invention.

[0040] The bridge antenna 6 includes an antenna substrate 60, an antenna patch 61, and two metal posts 62 (preferably a circular copper post), wherein the antenna patch 61 is embedded in the upper surface of the antenna substrate 60. The two metal posts 62 penetrate the antenna substrate 60 and are connected to the antenna patch 61. The antenna patch 61 is a "壬" font or a "壬" font structure (for example, a "王" font structure). It should be noted that the upper and lower sides of the "壬"-shaped structure formed by the antenna patch 61 are arranged in parallel, and the left and right ends of the "一"-shaped structure are respectively connected with a metal pillar 62. connection. In the present embodiment, the bridge antenna 6 is used to transmit signals from the broadband balun structure 10 or receive signals from an external device, that is, the signal in the broadband balun 10 passes through two metal posts 62 (ie, in two The root metal post 62 directly forms a potential difference) that is transmitted to the antenna patch 61 and transmitted into the air or receives signals from the outside. Among them, the antenna patch 61 of the "壬" type structure is advantageous for signal transmission. In the present embodiment, the antenna patch 61 is a solid copper sheet, and the antenna substrate 60 is a printed circuit board.

[0041] Further, the antenna substrate 60 has a length D1 and a height D4. The width of the upper and lower sides of the "壬"-shaped structure formed by the antenna patch 61 is D2 and the height is D3. The width of the middle of the "壬"-shaped structure formed by the antenna patch 61 is D5. The height of the upper and lower sides of the "壬"-shaped structure formed by the antenna patch 61 is D6. In the present embodiment, the preferred parameters of D1 to D5 are as follows: Dl = 59.2 mm, D 2 = 50.3 mm, D3 = 14.7 mm, D4 = 35.7 mm, D5 = 4.12 mm, and D6 = 8 mm.

Referring to FIG. 3, FIG. 3 is a schematic structural view of a broadband balun structure in a balun circuit structure of the antenna with a bridge structure of the present invention.

The broadband balun structure 1 of the present invention includes a first metal portion 10, a balun substrate 20, and a second metal portion 30.

In this embodiment, the broadband balun structure 1 is a rectangular parallelepiped structure having a length of M, a width of N, and a thickness. It is X (label not shown), wherein M is preferably 72.7 mm, N is preferably 59.2 mm, and X is preferably 1 mm.

[0044] The first metal portion 10 is attached to the upper surface of the balun substrate 20, and the second metal portion 30 is attached to the lower surface of the balun substrate 20. Two through holes 5 (ie, holes vertically penetrating the balun substrate 20) are disposed in the balun substrate 20, and the through holes 5 are provided with the first metal portions 10 and the second portion A metal post (not shown) of the metal portion 30. The first metal portion 10 and the second metal portion 30 are both copper faces and have the same thickness. Preferably, the first metal portion 10 and the second metal portion 30 have a thickness of 0.5 ounces.

In the present embodiment, the balun substrate 20 is a printed circuit board. The dielectric constant of the balun substrate 20 is preferably 3.45.

[0046] The first metal portion 10 is a tower structure, and includes a plurality of sections (for example, four quarters, five sections or six sections) of metal sheets stacked together and two base metal sheets on the left and right sides of the tower body. The composition of the tower base. Wherein, the top metal piece at the top of the tower body is a solid long strip structure, and other metal sheets constituting the tower body except the top metal piece at the top of the tower body are provided with slits, and each of the metal sheets is disposed A barrier resistor is also provided between the slits. A connection area is provided in one of the base metal sheets in the base of the base.

[0047] The second metal portion 30 includes a rectangular parallelepiped and a concave protruding portion located at a side of the rectangular parallelepiped protruding portion, and a connecting region is disposed in the concave protruding portion.

[0048] The through hole 5 is disposed in the balun substrate 20 (ie, the front surface vertically penetrates the hole of the balun substrate 20), wherein the through hole is provided with a metal pillar, and the through hole 5 corresponds to the first metal The connection region in the portion 1 and the connection region in the second metal portion 2 are connected to the connection region of the first metal portion 1 and the connection region of the second metal portion 2.

[0049] Further, the two metal posts 62 of the bridge antenna 6 are vertically connected to the ends of the two base metal sheets of the first metal portion 10, respectively. Specifically, the left metal pillar 62 of the bridge antenna 6 is vertically connected to the end position of the left base metal piece of the first metal portion 10, and the right metal pillar 62 of the bridge antenna 6 is vertical Connected to the end position of the right base metal piece of the first metal portion 10.

[0050] The structure of the first metal portion 10 in the broadband balun structure 1 will be described in detail below with reference to FIGS. 4-6, wherein the first metal portion 10 includes six metal sheets.

[0051] Specifically, as shown in FIG. 4, the first metal portion 10 includes a first isolation resistor R1 and a second isolation resistor. Resistor R2, third isolation resistor R3, fourth isolation resistor R4, first metal sheet 100, second metal sheet 1 10, third metal sheet 120, fourth metal sheet 130, fifth metal sheet 140 The sixth metal piece 150, the first base 160 and the second base 170.

[0052] The first metal portion 10 is a tower structure including a tower body and a tower base. The first metal piece 100, the second metal piece 110, the third metal piece 120, the fourth metal piece 130, the fifth metal piece 140, and the sixth metal piece 150 are stacked to form a tower body, and the first A base 160 and a second base 170 form a tower base.

[0053] wherein the first metal piece 100 is a rectangular solid structure. The second metal piece 110, the third metal piece 120, the fourth metal piece 130, the fifth metal piece 140, and the sixth metal piece 150 are all rectangular and have a slit (rectangular slit) inside. The dimensions of the first metal piece 100, the second metal piece 110, the third metal piece 120, the fourth metal piece 130, the fifth metal piece 140, and the sixth metal piece 150 are enlarged by section.

[0054] Further, the bottom of the first metal piece 100 is connected to the middle of the top of the second metal piece 110, and the bottom of the second metal piece 110 is connected to the middle of the top of the third metal piece 120. Position, the bottom of the third metal piece 120 is connected to the middle of the top of the fourth metal piece 130, and the bottom of the fourth metal piece 130 is connected to the middle of the top of the fifth metal piece 140, the fifth metal The bottom of the sheet 140 is attached to an intermediate position of the top of the sixth metal sheet 150.

[0055] wherein, the second metal piece 110, the third metal piece 120, the fourth metal piece 130, the fifth metal piece 140, and the sixth metal piece 150 are all rectangular and have a gap in the middle of the metal The first isolation resistor R1 is disposed in the slit of the second metal piece 110, the second isolation resistor R2 is disposed in the gap of the third metal piece 120, and the third isolation resistor R3 is disposed on the fourth metal piece. In the gap of 130, the fourth isolation resistor R4 is disposed in the slit of the fifth metal piece 140, and the fifth isolation resistor R5 is disposed in the gap of the sixth metal piece 150.

[0056] The first base 160 is disposed on the left side of the sixth metal piece 150, and the second base 170 is disposed on the right side of the sixth metal piece 150. The first base 160 is a metal piece with a rectangular solid structure. The second base 170 is an elongated structure.

As shown in FIG. 5, the width of the first isolation resistor R1 is Sl, the width of the second isolation resistor R2 is S2, the width of the third isolation resistor R3 is S3, and the width of the fourth isolation resistor R4 is S4.

[0058] The first metal sheet 100 has a length L0 and a width W0; [0059] The length of the second metal piece 110 is L1, the width of the second metal piece 110 is 2*W1+S1, and the width of the gap in the second metal piece 110 is S1, in other words, the second metal The sheet 110 is equivalent to two parallel metal sheets, each of which has a length L1 and a width W1, and the gap width between the two metal sheets arranged in parallel is SI;

[0060] The length of the third metal piece 120 is L2, the width of the third metal piece 120 is 2*W2+S2, and the width of the gap in the third metal piece 120 is S2, in other words, the third metal The sheet 120 is equivalent to two parallel metal sheets, each of which has a length L2 and a width W2, and a gap width between the two metal sheets arranged in parallel is S2;

[0061] The length of the fourth metal piece 130 is L3, the width of the fourth metal piece 130 is 2*W3+S3, and the width of the slit in the fourth metal piece 130 is S3, in other words, the fourth metal The sheet 130 is equivalent to two parallel metal sheets, each of which has a length L3 and a width W3, and a gap width between the two metal sheets arranged in parallel is S3;

[0062] The length of the fifth metal piece 140 is L4, the width of the fifth metal piece 140 is 2*W4+S4, and the width of the slit in the fifth metal piece 140 is S4, in other words, the fifth metal The sheet 140 is equivalent to two parallel metal sheets, each of which has a length L4 and a width W4, and a gap width between the two metal sheets arranged in parallel is S4;

[0063] The length of the sixth metal sheet 150 is L5, the width of the sixth metal sheet 150 is 2*W5+S5, and the width of the slit in the sixth metal sheet 150 is S5. In other words, the sixth metal The sheet 150 is equivalent to two parallel metal sheets, each of which has a length L5 and a width W5, and a gap width between the two metal sheets arranged in parallel is S5;

[0064] The first base 160 has a length L7 and a width of WO; the second base 170 has a length L7 and a width of both ends of wo.

[0065] As shown in FIG. 6, the second base 170 is a metal piece having an arc shape in the middle. The second base 170 includes a first folded metal piece 1701 and a second folded metal piece 1703, wherein the first folded metal piece 170 1 and the second folded metal piece 1703 form a fold gap at the joint. (ie zigzag gap).

[0066] Further, a first connection region 1702 is disposed on the first folded metal piece 1701, and a second connection region 1704 is disposed on the second folded metal piece 1703.

[0067] The first connection region 1702 and the second connection region 1704 respectively correspond to two through holes of the balun substrate 20

[0068] Further, the two metal posts 62 of the bridge antenna 6 are vertically connected to the end positions of the first base 160 and the second base 170 respectively (ie, two metal posts 62 and the first base 160). And the plane where the second base 1 70 is located is perpendicular). Specifically, the left metal pillar 62 of the bridge antenna 6 is vertically connected to the end position of the first base 160 (described in FIG. 1), and the right side metal of the bridge antenna 6 The post 62 is vertically connected to the end position of the second base 170 (described in FIG. 1).

As shown in FIG. 7, the second metal portion 30 includes a concave protruding portion 300 and a rectangular parallelepiped 310, and the concave protruding portion 300 is disposed at a side of the rectangular shape 310. As shown in FIG. 8, the concave protrusion 300 includes a first concave metal piece 301 and a second concave metal piece 303, wherein the first concave metal piece 301 and the second concave metal piece 303 are connected. A fold-shaped gap (ie, a zigzag slit) is formed. Further, a third connection region 302 is disposed on the first concave metal piece 301, and a fourth connection region 304 is disposed on the second concave metal piece 303. The third connection region 302 and the fourth connection region 304 respectively correspond to the two through holes 5 of the balun substrate 20. Wherein, the rectangular parallelepiped 310 has a length M (i.e., the same length as the balun substrate) and a width N-L 6, wherein the L6 is the length of the concave protrusion 300. The width of both ends of the concave protrusion 300 is W

[0070] Further, an electrical connection portion (for example, a metal wire or a metal post, preferably a circular copper post) in the balun substrate 20 is disposed in the through hole 5 and connected to the first connection region 1702 and the first Two connection areas 1704. Electrical connections (e.g., metal wires or metal posts) within the balun substrate 20 are also coupled to the third connection region 302 and the fourth connection region 304.

[0071] With the wide-band balun of the above structure, the bridge structure antenna 6 operates in the range of lGHz-8 GHz, and a good 180° phase shifting effect can be achieved in this range.

[0072] In this embodiment, the broadband balun structure 1 is simulated by the following parameters, and the specific parameters are as follows:

[Table 1]

[0073] As shown in FIG. 9, FIG. 9 is a result of S-parameters simulated by electromagnetic simulation software. It can be seen from FIG. 9 that the reflection coefficient (IS11I) of the balun is below -10 dB in the range of 1 GHz to 8 GHz. Barron can operate in the 1GHz to 8GHz range and achieve broadband characteristics. The IS23I is below -19dB in the operating band, indicating that this balun has good isolation characteristics. IS21I is nearly equal to IS31I, both in the vicinity of -3dB, indicating that energy can be divided from the two copper posts of the bridge structure antenna 6 to the two copper posts of the bridge structure antenna 6 (ie, the signal transmission port). on.

[0074] From the phase difference between the two copper posts of the bridge structure antenna 6 shown in Fig. 10, it can be seen that the phase difference between the two copper posts of the adjacent bridge structure antenna 6 is stable at around 180°. This shows that the balun structure of the balun has an excellent phase shifting effect between the two copper posts of the antenna 6. In combination with Figure 9, since the energy between the two copper pillars is equal amplitude and the phase difference is 180°, this balun can be widely used in the feeding of wideband differential antennas, and can also be applied in the field of radio frequency, which requires uniform phase shifting. The effect of the RF device.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the contents of the drawings, or indirectly or indirectly The technical field is equally included in the scope of patent protection of the present invention.

Industrial applicability The technical solution of the present invention adopts the above technical solution, and the technical effects of the invention are as follows: The phase difference between the adjacent output ports of the balun circuit structure with the bridge structure antenna of the invention can be stabilized at around 180°, and two output ports are realized. Good phase shifting effect.

Claims

Claim

[1] A balun circuit structure with a bridge structure antenna, wherein the balun circuit structure includes a broadband balun structure and a bridge antenna; the bridge antenna includes an antenna substrate and is attached to the antenna substrate. An antenna patch of the surface and two metal posts penetrating the antenna substrate and connected to the antenna patch; the broadband balun structure includes a balun substrate and a surface attached to the upper surface of the balun substrate a metal portion, a second metal portion attached to a lower surface of the balun substrate; the first metal portion is a tower structure, comprising a tower body composed of a plurality of metal sheets superposed and located on the left and right sides of the tower body A tower base composed of two base metal sheets, and other metal sheets constituting the tower body except the top metal piece at the top of the tower body are provided with slits, and each of the slits is further provided with a blocking resistor, the tower base a connection region is disposed in one of the base metal sheets; a metal post of the bridge antenna is vertically connected to an end of a base metal piece of the first metal portion, the bridge antenna a metal post is vertically connected to an end of the other base metal piece of the first metal portion; the second metal portion includes a rectangular parallelepiped and a concave protrusion located at a side of the rectangular parallelepiped protrusion, the concave protrusion a connecting area is disposed in the portion; a through hole is disposed in the balun substrate, and an electrical connection portion is disposed in the through hole, wherein the through hole corresponds to a connection region of one of the base metal pieces in the tower base and a concave protruding portion The connection region is connected to the connection region of the first metal portion and the connection region of the second metal portion.

[2] The balun circuit structure of the antenna with a bridge structure according to claim 1, wherein the first metal portion includes a first isolation resistor, a second isolation resistor, a third isolation resistor, and a fourth Isolation resistor, first metal piece, second metal piece, third piece metal piece, fourth piece metal piece, fifth piece metal piece, sixth piece metal piece, first base and second base, wherein The first metal piece, the second metal piece, the third metal piece, the fourth metal piece, the fifth metal piece and the sixth metal piece are superposed to form a tower body, the first base and the second base Form a tower base.

[Claim 3] The balun circuit structure of the antenna with a bridge structure according to claim 2, wherein the first metal piece is a top metal piece and is a rectangular solid structure, the second metal part Sheet, third section metal piece, fourth section metal piece, fifth section metal piece and sixth section metal piece The structure is rectangular and has a slit inside, and the dimensions of the first metal piece, the second metal piece, the third metal piece, the fourth metal piece, the fifth metal piece and the sixth metal piece are respectively For example, the first isolation resistor is disposed in the gap of the second metal piece, the second isolation resistor is disposed in the gap of the third metal piece, and the third isolation resistance is disposed in the gap of the fourth metal piece. The fourth isolation resistor is disposed in the slit of the fifth metal piece, and the fifth isolation resistor is disposed in the slit of the sixth metal piece.

[Claim 4] The balun circuit structure of the antenna with a bridge structure according to claim 3, wherein a bottom portion of the first metal piece is connected to an intermediate position of a top portion of the second metal piece, and a second The bottom of the metal piece is connected to the middle of the top of the third piece of metal, the bottom of the third piece is connected to the middle of the top of the fourth piece of metal, and the bottom of the fourth piece is connected to the fifth section. In the middle of the top of the metal piece, the bottom of the fifth metal piece is connected to the middle of the top of the sixth piece of metal.

[Claim 5] The balun circuit structure of the antenna with a bridge structure according to claim 3, wherein a first base is disposed on a left side of the sixth metal piece, and a right side is disposed on a sixth metal piece. Two bases.

[Claim 6] The balun circuit structure of the antenna with a bridge structure according to claim 5, wherein the second base is a metal piece having an arc shape in the middle, wherein: the second base includes the first a folded metal piece and a second folded metal piece, wherein the first folded metal piece and the second folded metal piece form a fold-shaped slit; the first folded metal piece is provided with a first connecting area, A second connection region is disposed on the second folded metal piece; the first connection region and the second connection region respectively correspond to the two through holes of the balun substrate.

[Claim 7] The balun circuit structure of the antenna with a bridge structure according to claim 6, wherein the fold gap formed by the connection between the first folded metal piece and the second folded metal piece is Z Type gap.

[Claim 8] The balun circuit structure of the antenna with a bridge structure according to claim 1, wherein the antenna patch is a "壬"-shaped structure, wherein the antenna patch is formed by ""壬"The upper and lower sides of the font structure are arranged in parallel, and the left and right ends of the middle of the "壬"-shaped structure are respectively connected to a metal column.

[Claim 9] The balun circuit structure of the antenna with a bridge structure according to claim 1, wherein the concave protrusion includes a first concave metal piece and a second concave metal piece, Forming a fold-shaped slit at a joint of the concave metal piece and the second concave metal piece, a third connection area is disposed on the first concave metal piece, and a fourth connection area is disposed on the second concave metal piece, The third connection region and the fourth connection region respectively correspond to the two through holes of the balun substrate.

[Claim 10] The balun circuit structure of the antenna with a bridge structure according to claim 9, wherein the fold gap formed by the connection between the first concave metal piece and the second concave metal piece is Z Type gap.