CN106602272A - Helical antenna device - Google Patents

Abstract

The invention provides a helical antenna device including a substrate, a signal output circuit, a columnar body, a ground wire, a helical antenna and a ring-shaped metal part. The signal output circuit is provided with the substrate, and the columnar body includes channels and spiral grooves. The bottom surface of the columnar body is fixed on the base plate, and the channel is formed along the central axis of the columnar body, and the spiral groove ring is arranged on the annular side of the columnar body. The ground wire is passed through the channel, and one end of the ground wire is fixed on the substrate and electrically connected to the signal output circuit. The helical antenna surrounds the cylindrical body and at least a part thereof is disposed in the helical groove, and one end of the helical antenna is fixed on the substrate and is electrically connected to the signal output circuit. The ring-shaped metal piece is disposed on the base plate and surrounds the columnar body. By utilizing the helical antenna device of the present invention, the anti-interference ability of the helical antenna in terms of signal transmission and reception is enhanced through the mutual cooperation of the ring-shaped metal piece and the grounding layer.

Description

helical antenna device

【Technical field】

The present invention relates to an antenna, and in particular to a helical antenna arrangement.

【Background technique】

Electronic devices that utilize satellites for positioning and navigation, such as Global Positioning System (GPS) electronic devices, need to communicate wirelessly with satellites. In order to achieve the purpose of wireless communication, the GPS electronic device must be equipped with an antenna, and the antenna is used to receive GPS signals. There are various types and types of antennas. Taking the application field of GPS as an example, the antenna of the GPS electronic device can be a patch antenna or a helix antenna. Generally speaking, flat panel antennas generally have the problem of narrow signal bandwidth that can be received, while helical antennas have a larger bandwidth. Therefore, helical antennas are generally better suited for receiving GPS signals than flat-panel antennas.

However, since the material of the helical antenna is generally relatively soft, the shape and structure of the helical antenna are naturally susceptible to deformation due to external forces. During the process of assembling the helical antenna into the electronic device or the delivery process after assembling, the helical antenna is often deformed due to external force extrusion or collision. When the structure of the helical antenna is deformed, structural parameters such as pitch or tilt angle of the helical antenna will change. Once the structural parameters of the antenna change slightly, it will affect the quality of the antenna sending and receiving signals.

However, in order to ensure that the helical antenna will not be deformed due to external force during the assembly process or the transportation process, the operators and delivery personnel on the production line must be extremely careful to avoid the helical antenna being squeezed or collided, so It is bound to take more time, which will greatly increase the cost of production and delivery, which is unrealistic.

In addition, in terms of the radiation pattern of the helical antenna, the radiation intensity in a specific direction (such as the direction of the GPS signal) is not significantly different from that in other directions. In other words, the helical antenna itself may not be capable of receiving signals in a particular direction. In addition, the signal input and output circuits connected to the helical antenna or the circuits on the electronic device may also interfere with the helical antenna in terms of signal transmission and reception.

In order to solve the above problems, how to assemble the helical antenna on the substrate conveniently, and how to prevent the structural parameters of the helical antenna from being deformed due to external force, and how to enhance the signal receiving ability of the helical antenna and avoid circuit interference are urgently needed solutions in the industry. The problem.

【Content of invention】

In view of this, the present invention proposes a helical antenna device, so that the helical antenna can be easily and accurately assembled on the substrate, and is not easily deformed by external force, so as to ensure the structural parameters of the helical antenna. In addition, the signal receiving capability and anti-circuit interference capability of the helical antenna can be enhanced.

In one embodiment, a helical antenna device includes a substrate, a signal output circuit, a column, a ground wire, a helical antenna, and a ring-shaped metal component. The signal output circuit is arranged on the substrate, and the columnar body includes a channel and a spiral groove. The bottom surface of the columnar body is fixed on the base plate, and the channel is formed along the central axis of the columnar body, and the spiral groove ring is arranged on the annular side of the columnar body. The ground wire is passed through the channel, and one end of the ground wire is fixed on the substrate and electrically connected to the signal output circuit. The helical antenna surrounds the cylindrical body and at least a part thereof is disposed in the helical groove, and one end of the helical antenna is fixed on the substrate and is electrically connected to the signal output circuit. The ring-shaped metal piece is disposed on the base plate and surrounds the columnar body.

In one embodiment, the substrate includes a circuit layer, a first insulating layer, a ground layer, and a second insulating layer. The first insulating layer is located between the circuit layer and the ground layer, the ground layer is located between the first insulating layer and the second insulating layer, and the signal output circuit is arranged on the circuit layer.

In one embodiment, the signal output circuit and the helical antenna are isolated by the ground plane in a vertical direction relative to the ground plane.

In one embodiment, the bottom section of the helical antenna can be fixed and electrically connected to the circuit layer after passing through the second insulating layer, the ground layer and the first insulating layer.

In one embodiment, the annular metal member defines a first annular opening cross section and a second annular opening cross section, the first annular opening cross section is adjacent to the substrate, and there is a vertical line between the second annular opening cross section and the substrate. Height, wherein the area of the cross-section of the first annular opening is smaller than the area of the cross-section of the second annular opening, wherein the area of the cross-section of the annular metal piece increases sequentially from the cross-section of the first annular opening toward the cross-section of the second annular opening .

In one embodiment, the top section of the helical antenna is away from the substrate, and the normal vector of the radial section of the top section of the helical antenna is parallel to the tangent direction of the circular side surface of the columnar body.

In one embodiment, the substrate includes a first through hole and a second through hole, the bottom section of the ground wire is passed through and fixed in the first through hole, and the bottom section of the helical antenna is passed through and fixed in the second through hole.

In one embodiment, the columnar body includes at least one buckle, the base plate includes at least one third through hole, the buckle is protruded from the bottom surface of the columnar body, and is used for fastening the third throughhole.

In summary, according to the helical antenna device of the present invention, the helical antenna is arranged on the columnar body, and the helical antenna is then assembled on the substrate through the columnar body, so as to provide a very convenient and accurate assembling method of the helical antenna, and the assembly The shape and structure of the final helical antenna are supported by the columnar body so that it is not easily deformed, thereby ensuring the structural parameters of the helical antenna. In addition to enhancing the signal receiving capability of the helical antenna in the vertical direction of the substrate, the ring-shaped metal piece can also isolate interference from the horizontal direction of the substrate. The signal output circuit and the helical antenna are isolated by the ground layer, which can isolate the interference from the signal output circuit. Therefore, the anti-interference capability of the helical antenna in terms of signal transmission and reception is enhanced through the mutual cooperation of the ring-shaped metal piece and the ground layer.

The detailed features and advantages of the present invention are described in detail below in the implementation manner, the content of which is sufficient to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the scope of the patent application and the drawings , anyone skilled in the relevant art can easily understand the related objects and advantages of the present invention.

【Description of drawings】

FIG. 1 is a schematic diagram of a helical antenna device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the helical antenna device in FIG. 1 after being turned over 180 degrees.

FIG. 3 is an exploded view of the helical antenna device of FIG. 1 .

FIG. 4 is a schematic diagram of an aspect of the helical antenna, the ground wire and the columnar body in FIG. 1 .

Fig. 5 is a cross-sectional view of line segment 5-5 in Fig. 1 .

FIG. 6 is a side view of the helical antenna, the ground wire and the column in FIG. 4 .

Fig. 7 is a cross-sectional view of line segment 7-7 in Fig. 6 .

【detailed description】

Please refer to Figure 1 and Figure 2. FIG. 1 is a schematic diagram of a helical antenna device 10 according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of the helical antenna device 10 in FIG. 1 after being turned over 180 degrees around the X-axis. In one embodiment, the helical antenna device 10 can be assembled on a specific electronic device (such as a portable or car navigation device) to send and receive radio frequency signals (such as a GPS signal).

The helical antenna device 10 includes a substrate 100 , a signal output circuit 200 , a columnar body 300 , a ground wire 400 , a helical antenna 500 and a ring metal piece 600 . The substrate 100 includes a first surface 101 and a second surface 102 , wherein the first surface 101 and the second surface 102 are opposite to each other. The signal output circuit 200 is disposed on the second surface 102 of the substrate 100 , and the columns 300 are engaged with the substrate 100 . The signal output circuit 200 may include various electronic circuit components, such as filters, low noise amplifiers and grounding circuits. The ground wire 400 and the helical antenna 500 are disposed on the columnar body 300 , and the ground wire 400 and the helical antenna 500 are further electrically connected to the signal output circuit 200 . The ring metal part 600 is disposed on the substrate 100 and surrounds the pillar 300 .

Please refer to Figures 3 and 4. FIG. 3 is an exploded view of the helical antenna device 10 in FIG. 1 , and FIG. 4 is a schematic diagram of an aspect of the helical antenna 500 , the ground wire 400 and the columnar body 300 in FIG. 1 . The columnar body 300 includes a channel 310 and a spiral groove 320. In this embodiment, the columnar body 300 is cylindrical, and the annular side surface 301 of the columnar body 300 is coaxial with the central axis of the columnar body 300 and surrounds the side of the columnar body 300. , the central axis of the columnar body 300 is parallel to the Z axis. The top surface 302 and the bottom surface 303 of the columnar body 300 are respectively located at two opposite ends of the columnar body 300 in the central axial direction. The bottom surface 303 of the columnar body 300 is fixed on the substrate 100 , and the bottom surface 303 is located on the first surface 101 of the substrate 100 . The channel 310 is formed along the central axis of the cylindrical body 300 , and the channel 310 passes through from the top surface 302 to the bottom surface 303 . The spiral groove 320 is disposed around the annular side surface 301 of the columnar body 300 .

The ground wire 400 is a linear structure, and the ground wire 400 can further define a ground wire top section 401 and a ground wire bottom section 402 . The ground wire bottom section 402 is located at one end of the ground wire 400 , and the ground wire top section 401 is located at the opposite end of the ground wire 400 . The ground wire 400 passes through the channel 310 , and the top section 401 of the ground wire is located in the channel 310 . The bottom section 402 of the ground wire extends outward from the bottom surface 303 of the columnar body 300 and is further fixed on the substrate 100 . Both the columns 300 and the ground wires 400 are perpendicular to the first surface 101 and the second surface 102 of the substrate 100 , and the first surface 101 and the second surface 102 are parallel to the X-Y plane.

The helical antenna 500 is generally a helical structure, and the helical antenna 500 can further define an antenna top section 501 , an antenna main body 502 and an antenna bottom section 503 . The antenna bottom section 503 is located at one end of the helical antenna 500 , while the antenna top section 501 is located at the other end of the helical antenna 500 , and the antenna main body 502 is located between the antenna top section 501 and the antenna bottom section 503 . The helical antenna 500 surrounds the cylindrical body 300 , and at least a part of the helical antenna 500 is disposed in the helical groove 320 . Specifically, the antenna main body 502 is helical and surrounds the annular side 301 of the columnar body 300, the antenna top section 501 is far away from the substrate 100 relative to the antenna bottom section 503, and the antenna bottom section 503 is from the antenna main body 502 toward the substrate 100 and along a parallel The antenna bottom section 503 is bent and extended in the direction of the negative Z axis, so the antenna bottom section 503 is parallel to the central axis of the ground wire 400 and the columnar body 300 . The antenna bottom section 503 is fixed on the substrate 100 , and the antenna top section 501 and the antenna main body 502 are located on a side of the substrate 100 opposite to the signal output circuit 200 . In other words, the substrate 100 is located between the antenna top section 501 , the antenna main body 502 and the signal output circuit 200 .

In one embodiment, the columnar body 300 further includes a plurality of flanges 330 , and these flanges 330 are disposed on the annular side surface 301 of the columnar body 300 at intervals. A spiral groove 320 is formed between two adjacent flanges 330 along the Z axis, and these flanges 330 are used to form a part of the spiral groove 320, that is, these flanges 330 are formed discontinuously around the annular side surface 301. spiral shape. As a result, the gaps 331 are formed by the flanges 330 spaced apart on the helical circular path. A part of the antenna body 502 is located in the spiral groove 320 , and another part of the antenna body 502 is located in the notch 331 . Although the flanges 330 are only part of the helical groove 320 , they still provide good support for maintaining the shape and structure of the helical antenna 500 .

In one embodiment, the substrate 100 includes a first through hole 110 and a second through hole 120 . The first through hole 110 is disposed corresponding to the ground wire 400 , and the second through hole 120 is disposed corresponding to the helical antenna 500 . The ground wire bottom section 402 at one end of the ground wire 400 is fixed in the first through hole 110 , and the antenna bottom section 503 at one end of the helical antenna 500 is fixed in the second through hole 120 .

In one embodiment, the substrate 100 includes two substrate circuits 140 disposed on the second surface 102 . One of the two substrate circuits 140 is electrically connected between the inside of the wall of the first through hole 110 (not shown) and the signal output circuit 200; similarly, the other substrate circuit 140 is electrically connected to the second through hole 120 Between the inside of the hole wall (not shown) and the signal output circuit 200 . Specifically, after the ground wire bottom section 402 of the ground wire 400 and the antenna bottom section 503 of the helical antenna 500 are electrically connected to the inner sides of the first and second through holes 110 and 120 respectively, they are electrically connected to the signal output through the substrate circuit 140 Circuit 200. In other embodiments, these substrate circuits 140 can also be disposed inside the substrate 100 , and can also be disposed on the first surface 101 of the substrate 100 .

In one embodiment, the substrate 100 includes at least one third through hole 130 in addition to the first through hole 110 and the second through hole 120 , and the columnar body 300 further includes at least one buckle protruding from the bottom surface 303 of the columnar body 300 340 pieces. For convenience of description, the following two third through holes 130 and two buckling parts 340 are taken as examples. The two buckling parts 340 can be disposed symmetrically to each other, and the two third through holes 130 are respectively disposed corresponding to the two buckling parts 340 , so the two buckling parts 340 can fasten the two third through holes 130 respectively. In other embodiments, there may be one or more than three buckling pieces 340 , and correspondingly, one or more third through holes 130 may also be provided corresponding to the buckling pieces 340 . In one embodiment, the first through hole 110 , the second through hole 120 and the third through hole 130 are aligned along the same direction and spaced from each other. In other embodiments, the first through hole 110 , the second through hole 120 and the third through hole 130 may be distributed.

In one embodiment, the buckle 340 includes an extension portion 341 and a hook portion 342 . The extension part 341 is a rectangular cylinder, and the hook part 342 is a triangular cylinder. One end of the extension portion 341 is connected to the hook portion 342 , and the other end of the extension portion 341 is connected to the bottom surface 303 of the columnar body 300 . The two hook portions 342 of the two buckling parts 340 extend away from each other. After the extension portion 341 is passed through the third through hole 130 , the bottom surface 303 of the columnar body 300 will abut against the first surface 101 of the substrate 100 , and the hook portion 342 will buckle against the second surface 102 of the substrate 100 .

One of the technical features of the present invention is that through the first through hole 110 , the second through hole 120 and the third through hole 130 on the substrate 100 , the helical antenna 500 , the ground wire 400 and the columnar body 300 can be assembled onto the substrate 100 simply, conveniently and accurately. . During assembly, the assembler first aligns the bottom section of the ground wire 402, the bottom section of the antenna 503 and the buckle 340 with the first through hole 110, the second through hole 120 and the third through hole 130 respectively, and then applies a little force to align the columnar body 300 with the substrate 100. Close to each other along the Z axis, so that the ground wire bottom section 402 enters the first through hole 110 , the antenna bottom section 503 enters the second through hole 120 , and the buckle 340 enters the third through hole 130 . Until the two hooks 342 pass through the two third through holes 130 completely, the hooks 342 will abut against the second surface 102 of the substrate 100 , and the bottom surface 303 of the pillar 300 will abut against the first surface 101 of the substrate 100 , Therefore, the substrate 100 is clamped between the bottom surface 303 of the pillar 300 and the hook portion 342 . In other words, the relative position of the pillar body 300 and the substrate 100 can be fixed by the cooperation between the bottom surface 303 of the pillar body 300 and the hook portion 342 .

As shown in FIG. 2 , after the hook portion 342 passes through the third through hole 130 completely, the bottom section of the ground wire 402 and the bottom section of the antenna 503 will slightly protrude from the second surface 102 of the substrate 100 . Next, the assembler can weld the joints between the bottom section of the ground wire 402 and the first through hole 110, and the joint between the bottom section of the antenna 503 and the second through hole 120, so that the bottom section of the ground wire 402 and the bottom section of the antenna 503 are connected to the bottom section of the antenna respectively. The two substrate circuits 140 are electrically connected. After soldering, the ground wire 400 and the helical antenna 500 can not only electrically connect the signal output circuit 200 respectively, but also make the connection between the ground wire 400 , the helical antenna 500 , the columnar body 300 and the substrate 100 more stable.

Please refer to FIG. 5 , which is a cross-sectional view of line 5-5 in FIG. 1 . In one embodiment, the substrate 100 is a multi-layer board, and the substrate 100 includes a circuit layer 151 , a first insulating layer 152 , a ground layer 153 and a second insulating layer 154 . Wherein, the circuit layer 151 , the first insulating layer 152 , the ground layer 153 and the second insulating layer 154 are all parallel to the X-Y plane and stacked on each other. The first insulating layer 152 is located between the circuit layer 151 and the ground layer 153 , the ground layer 153 is located between the first insulating layer 152 and the second insulating layer 154 , and the signal output circuit 200 and the substrate circuit 140 are disposed on the circuit layer 151 . In one embodiment, the antenna bottom section 503 of the helical antenna 500 passes through the second insulating layer 154, the ground layer 153 and the first insulating layer 152 and is fixed and electrically connected to the substrate circuit 140 of the circuit layer 151; similarly, the ground The bottom section 402 of the ground wire of the wire 400 passes through the second insulating layer 154 , the ground layer 153 and the first insulating layer 152 to be fixed and electrically connected to another substrate circuit 140 of the circuit layer 151 . In other embodiments, the bottom section of the ground wire 402 can pass through the second insulating layer 154 to be electrically connected to the ground layer 153, and the ground layer 153 can then be connected to a specific ground through other lines (not shown) inside the substrate 100. end.

The signal output circuit 200 and the helical antenna 500 are isolated by the ground layer 153 in a vertical direction relative to the ground layer 153 , which is a direction perpendicular to the ground layer 153 and parallel to the Z-axis. In one embodiment, the antenna top section 501 and the antenna main body 502 of the helical antenna 500 are the main parts for receiving signals, and the antenna bottom section 503 of the helical antenna 500 is a signal feeding end, and the antenna bottom section 503 is used to The received signal is transmitted to the signal output circuit 200 . Since the signal output circuit 200 and the antenna top section 501 and the antenna main body 502 of the helical antenna 500 will be isolated in the Z direction by the ground layer 153, when the helical antenna 500 receives a signal, it will not be affected by the signal output circuit 200 (or the helical antenna device). 10) interference from other electronic components installed on the electronic device), so as to ensure the stability of the helical antenna 500 in receiving signals.

The ring metal part 600 surrounds the antenna top section 501 and the antenna main body 502 of the helical antenna 500 along the Z axis, so the ring metal part 600 can isolate interference from all directions. The ground layer 153 can isolate the interference from the Z direction and its components. Therefore, under the mutual cooperation of the ground layer 153 and the ring-shaped metal piece 600, the helical antenna 500 has better anti-interference ability in signal transmission and reception, so that it can be more Efficiently receive signals from a specific direction (eg, from the direction of the GPS signal on the positive Z axis in FIG. 1 ). In different embodiments, the ring-shaped metal part 600 can be fixed on the first surface 101 of the substrate 100 by means of adhesion, welding or clamping.

In one embodiment, as shown in FIGS. 3 and 5 , the annular metal member 600 defines a first annular opening cross section and a second annular opening cross section. The first annular opening cross-section is adjacent to the first surface 101 of the substrate 100 , and the second annular opening cross-section is away from the first surface 101 of the substrate 100 . In this embodiment, the cross section of the first annular opening corresponds to the annular bottom surface 601 of the annular metal member 600 , and the second annular opening cross section corresponds to the annular top surface 602 of the annular metal member 600 . The ring-shaped bottom surface 601 and the ring-shaped top surface 602 are parallel to the X-Y plane, and there is a vertical height between the ring-shaped top surface 602 and the first surface 101 of the substrate 100, the vertical means parallel to the Z axis and perpendicular to X-Y plane. The vertical height is roughly equivalent to the height of the columnar body 300 (excluding the buckle 340 ) relative to the first surface 101 in the Z direction. In other words, the antenna top section 501 and the antenna main body 502 of the helical antenna 500 do not exceed the annular top surface 602 in the Z direction, thereby ensuring that the annular metal member 600 has a better effect in isolating interference.

In addition, the area of the annular bottom surface 601 is smaller than the area of the annular top surface 602, wherein the area of the cross section of the annular metal member 600 is from the annular bottom surface 601 to the annular top surface 602 and along the positive Z direction. In increasing order, the cross-section means the cross-section of the ring-shaped metal member 600 parallel to the X-Y plane. In other words, one of the technical features of the present invention is that the annular metal member 600 has a geometric structure similar to a truncated cone (Truncated cone), which helps to strengthen the reception of the helical antenna 500 from a specific direction (such as from FIG. 1 ). Positive Z-axis direction) signal capability. In other embodiments, the helical antenna 500 can be used for two-way communication, that is, the helical antenna 500 can be used to send and receive signals, and the ring metal piece 600 can help the helical antenna 500 to receive signals from a specific direction , also contributes to the ability of the helical antenna 500 to transmit signals in a specific direction.

Please refer to FIG. 6 and FIG. 7 , FIG. 6 is a side view of the helical antenna 500 , the ground wire 400 and the columnar body 300 in FIG. 4 , and FIG. 7 is a cross-sectional view of line 7-7 in FIG. 6 . In this embodiment, the normal vector of the radial section of the antenna top section 501 is parallel to the tangent direction of the annular side surface 301 . Specifically, the cross-section of the antenna top section 501 at the virtual plane S (that is, the radial section of the antenna top section 501) has a normal vector N, and the intersection of the circular side 301 of the columnar body 300 and the virtual plane S has a tangent vector T, and the normal vector N will be parallel to the tangent vector T. In other words, the antenna top section 501 and the antenna main body 502 will jointly form a helical structure. Based on this structure, the helical antenna device 10 can generate a relatively circular or omnidirectional radiation pattern (radiation pattern) for increasing Signal reception capability of all electromagnetic waves coming and going.

In one embodiment, the helical antenna device 10 is used to transmit and receive circularly polarized signals, and the helical antenna 500 is used as a signal feeding path, and the ground wire 400 is grounded. The cooperation between the helical antenna 500 and the ground wire 400 can be used to receive signals with a specific frequency, for example, through the pitch and inclination angle of the helical antenna 500 and the axis distance between the helical antenna 500 and the ground wire 400...etc. Specific structural parameters In combination, the helical antenna device 10 can be suitable for receiving GPS signals. Furthermore, since the ground wire 400 is arranged in the helical antenna 500 (that is, the ground wire 400 is located at the central axis of the helical antenna 500), and combined with the signal fed from the antenna bottom section 503 of the helical antenna 500, the helical antenna 500 The magnetic flux inside increases, so that the helical antenna device 10 has a good omnidirectional ability to receive GPS signals.

One of the technical features of the present invention is that the ability of the helical antenna device 10 to receive GPS signals in a specific direction is further improved by using the ring-shaped metal piece 600 . For example, since the ring-shaped metal member 600 is surrounded by the Z axis and its inner wall is inclined toward the Z-axis along the negative Z direction and shrinks inwardly, therefore, the ring-shaped metal member 600 can be reflected from the positive The GPS signal transmitted in the Z direction concentrates toward the place where the helical antenna 500 and the ground wire 400 are located. That is to say, most of the radiation pattern of the helical antenna device 10 will be limited within the range of the ring-shaped metal piece 600; In the range of the metal part 600 , it has a better signal receiving capability than outside the ring metal part 600 .

Although the technical content of the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention, and any modifications and modifications made by those skilled in the art without departing from the spirit of the present invention should be included in the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

Claims (8)

1. A helical antenna device, characterized in that, comprising: a substrate; a signal output circuit arranged on the substrate; A columnar body, including a channel and a spiral groove, the bottom surface of the columnar body is fixed on the base plate, the channel is formed along the central axis of the columnar body, and the spiral groove is arranged on the annular side of the columnar body; A ground wire is passed through the channel, one end of the ground wire is fixed on the substrate and electrically connected to the signal output circuit; a helical antenna surrounding the columnar body and at least a part of it is disposed in the helical groove, one end of the helical antenna is fixed on the substrate and electrically connected to the signal output circuit; and A ring-shaped metal piece is arranged on the base plate and surrounds the columnar body. 2. The helical antenna device according to claim 1, wherein the substrate comprises a circuit layer, a first insulating layer, a ground layer and a second insulating layer, and the first insulating layer is located between the circuit layer and the second insulating layer. Between the ground layers, the ground layer is located between the first insulating layer and the second insulating layer, and the signal output circuit is disposed on the circuit layer. 3. The helical antenna device according to claim 2, wherein the signal output circuit and the helical antenna are isolated by the ground layer in a vertical direction relative to the ground layer. 4. The helical antenna device according to claim 2, wherein the bottom section of the helical antenna can be fixed and electrically connected to the circuit after passing through the second insulating layer, the ground layer and the first insulating layer Floor. 5. The helical antenna device according to claim 1, wherein the annular metal member defines a first annular opening cross-section and a second annular opening cross-section, the first annular opening cross-section is adjacent to the substrate Above, there is a vertical height between the cross-section of the second annular opening and the substrate, wherein the area of the cross-section of the first annular opening is smaller than the area of the cross-section of the second annular opening, wherein the cross-section of the annular metal member The area of the first annular opening cross-section increases sequentially toward the direction of the second annular opening cross-section. 6. The helical antenna device according to claim 1, wherein the top section of the helical antenna is away from the substrate, and the normal vector of the radial section of the top section of the helical antenna is parallel to the tangent of the annular side of the columnar body direction. 7. The helical antenna device according to claim 1, wherein the substrate includes a first through hole and a second through hole, the bottom section of the ground wire is passed through and fixed in the first through hole, the helical antenna The bottom section passes through and is fixed on the second through hole. 8. The helical antenna device according to claim 7, wherein the columnar body includes at least one buckle, the substrate includes at least one third through hole, and the at least one buckle is protruded from the bottom surface of the columnar body , for fastening the at least one third through hole.