CN216354805U - Antenna element circuit board and antenna - Google Patents
Antenna element circuit board and antenna Download PDFInfo
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- CN216354805U CN216354805U CN202220071405.4U CN202220071405U CN216354805U CN 216354805 U CN216354805 U CN 216354805U CN 202220071405 U CN202220071405 U CN 202220071405U CN 216354805 U CN216354805 U CN 216354805U
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Abstract
The utility model relates to the field of signal processing, and provides an antenna oscillator circuit board, which structurally comprises a substrate and a metal circuit printed on the substrate, wherein a balanced feed connecting wire in the metal circuit surrounds a grounding metal area, one end of a first balanced feed connecting wire is connected with a second antenna oscillator interface, the other end of the first balanced feed connecting wire is connected with one end of a second balanced feed connecting wire, the other end of the second balanced feed connecting wire is connected with the first antenna oscillator interface, the first antenna oscillator interface is connected with a coaxial cable interface, the first balanced feed connecting wire is L-shaped, the second balanced feed connecting wire comprises a snake-shaped balanced feed connecting wire, a shielding metal area and a grounding metal area in the metal circuit are positioned on two sides of the balanced feed connecting wire, and the line width of the first balanced feed connecting wire is different from the line width of the second balanced feed connecting wire. The circuit board has small size, good matching effect and low loss, and can use microstrip lines with different characteristic impedances as a balun.
Description
Technical Field
The utility model relates to the field of signal processing, in particular to an antenna element circuit board and an antenna.
Background
The dipole antenna is a balanced type antenna and the coaxial cable is an unbalanced transmission line, and thus, a balun is added between the antenna and the cable. Patent ZL201120535345.9 discloses an antenna element circuit board, be used for as balanced unbalanced transformer, including base plate and the metal circuit of printing on the base plate, this metal circuit includes two antenna element interfaces, connect the balanced feed line between two antenna element interfaces, ground connection metal sheet and coaxial cable interface, the antenna element interface sets up the top at the base plate, the below is the ground connection metal sheet, two antenna element interfaces are connected around the ground connection metal sheet to balanced feed line, coaxial cable interface and an antenna element interface connection, the coaxial cable interface is located the ground connection metal sheet, the ground connection metal sheet is seted up and is held the region of coaxial cable interface, both not electric connection each other.
However, the circuit board has a large size and cannot meet the requirement of miniaturization of the vibrator.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide an antenna oscillator circuit board with small size, good matching effect and low loss, which utilizes microstrip lines with different characteristic impedances as a balun and also provides an antenna comprising the antenna oscillator circuit board.
The utility model achieves the above object through the following technical scheme.
An antenna oscillator circuit board structurally comprises a substrate and a metal circuit printed on the upper layer of the substrate, wherein the bottom layer of the substrate is a nonmetal bottom layer, the metal circuit comprises two antenna oscillator interfaces, a balance feed connecting line connected between the two antenna oscillator interfaces, a grounding metal area surrounded by the balance feed connecting line and a coaxial cable interface, a gap is formed between the balance feed connecting line and the grounding metal area, and the two antenna oscillator interfaces are not electrically connected with each other; the grounding metal area is internally provided with an area for accommodating a coaxial cable interface, and the grounding metal area and the area are not electrically connected with each other; the metal circuit further comprises a shielding metal area, the shielding metal area and the grounding metal area are located on two sides of the balanced feed connecting line, a gap is formed between the balanced feed connecting line and the shielding metal area and are not electrically connected with each other, the balanced feed connecting line comprises a first balanced feed connecting line and a second balanced feed connecting line, the first balanced feed connecting line is in an L shape, the second balanced feed connecting line comprises a snake-shaped balanced feed connecting line, one end of the first balanced feed connecting line is connected with the second antenna oscillator interface, the other end of the first balanced feed connecting line is connected with one end of the second balanced feed connecting line, the other end of the second balanced feed connecting line is connected with the first antenna oscillator interface, and the line width of the first balanced feed connecting line is different from the line width of the second balanced feed connecting line.
The circuit board can realize the balun function of converting a balanced signal into an unbalanced signal, namely, balanced-unbalanced conversion. The grounding metal area and the shielding metal area are both realized in a large-area copper-clad mode, the shielding metal area is in an electrical connection suspension state, the shielding metal area can not only isolate the signal interference of external energy on the balanced feed line, but also prevent the signal energy on the balanced feed line from radiating outwards, and the dual protection function can reduce the signal energy loss. The first balanced feed line is L-shaped, transmission loss caused by multiple corners of the balanced feed line is reduced while the balanced feed line is ensured to have longer shielding distance with a grounding metal area, the area of a circuit board is utilized to the maximum extent, the second balanced feed line comprises a section of snake-shaped balanced feed line, the area of a required substrate and a metal circuit printed on the substrate is reduced by the design of the snake-shaped balanced feed line, the requirement of the small size of the circuit board is met, the inductance of the balanced feed line can be increased, the impedance matching effect is improved, and meanwhile, the first balanced feed line and the second balanced feed line are designed in different line widths, so that the matching effect is enhanced.
Further, the line width of the first balanced feed line is larger than that of the second balanced feed line.
Furthermore, in order to meet the requirement of increasing the shielding effect while the length of the second balanced feed line, the adjacent area of the second balanced feed line and the grounding metal area is increased, the serpentine balanced feed line of the second balanced feed line comprises two sections of arc-shaped balanced feed lines and one section of S-shaped balanced feed line, the S-shaped balanced feed line is connected between the two sections of arc-shaped balanced feed lines, the line distance is increased at the turning position of the S-shaped balanced feed line, and the line distance is increased so as to reduce the signal interference between the S-shaped balanced feed lines.
Furthermore, a straight line balanced feed connecting line is led out from the two sections of arc-shaped balanced feed connecting lines of the second balanced feed connecting line and is respectively connected with the first balanced feed connecting line and the first antenna oscillator interface.
Further, the shielding metal region is located at one side of the second balanced feed line.
Furthermore, two antenna element interfaces are arranged above the substrate. In order to better realize impedance matching and reduce loss, the two antenna element interfaces are both processed by large-area copper cladding. The copper-clad area of the first antenna oscillator interface is connected with the coaxial cable interface below through a section of connecting wire, the connecting angle of the connecting wire and the copper-clad area of the first antenna oscillator interface is arc-shaped, the connecting angle is arc-shaped, transmission loss can be reduced to the greatest extent, and optimal transmission of signals is ensured.
Furthermore, the end part of the first balanced feed connecting line is bent upwards and connected with the straight line balanced feed connecting line of the second balanced feed connecting line.
Furthermore, in order to reduce signal transmission loss, the turning angles of the balanced feed connecting line are all arc-shaped.
Furthermore, in order to reduce the signal interference between the first balanced feed connecting wire and the second balanced feed connecting wire to the maximum extent, one end of a copper-clad area of the antenna oscillator interface, which is close to the edge of the substrate, is connected with the second balanced feed connecting wire below; one end of a copper-clad area of the second antenna element interface close to the edge of the substrate is connected with a first balanced feed connecting wire below.
Furthermore, in order to facilitate connection of the coaxial cable and the antenna oscillator, interference between the oscillator and the antenna main body mounting structure is avoided, and the coaxial cable interface is located in the middle of the substrate.
Furthermore, the second balanced feed line is located on one side of the coaxial cable interface and below the first antenna element interface.
Furthermore, the two antenna oscillator interfaces are provided with through holes which are symmetrically arranged and used for connecting metal devices of the antenna oscillators.
The utility model also provides an antenna which comprises the antenna element circuit board.
The antenna oscillator circuit board provided by the utility model realizes balanced and unbalanced signal conversion, adopts a single circuit board to realize a balun function, has good shielding effect, good matching effect and low loss, can realize wider bandwidth matching, realizes current amplitude balance and impedance matching of two antenna oscillator interfaces on a wide frequency band, has smaller area, and greatly reduces the structure and the volume of an antenna oscillator.
Drawings
Fig. 1 is a structural diagram of an antenna element circuit board according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of the circuit board of the antenna element shown in fig. 1.
Detailed Description
The utility model is further illustrated by way of example in the following with reference to the accompanying drawings.
Fig. 1 shows an antenna element circuit board which can be used for UHF band antennas as a balun.
As shown in fig. 1, the antenna element circuit board includes a substrate 1 and a metal circuit printed on an upper layer of the substrate 1, and a bottom layer of the substrate 1 is a non-metal bottom layer. The metal circuit comprises two antenna element interfaces which are arranged above the substrate 1 and are called as an antenna element interface I21 and an antenna element interface II 22, and further comprises a balanced feed connecting line connected between the antenna element interface I21 and the antenna element interface II 22, a grounding metal area 4 surrounded by the balanced feed connecting line, a shielding metal area 5 and a coaxial cable interface 6.
The balanced feed connection line comprises a first balanced feed connection line 31 and a second balanced feed connection line 32, the line width of the first balanced feed connection line 31 is larger than that of the second balanced feed connection line 32, and the turning angles of the balanced feed connection lines are arc-shaped. Gaps are arranged between the grounding metal area 4 and the shielding metal area 5 and the balanced feed connecting line, and are not electrically connected with each other, the shielding metal area 5 and the grounding metal area 4 are positioned at two sides of the balanced feed connecting line, and the shielding metal area 5 is positioned at one side of the second balanced feed connecting line 32. The grounding metal area 4 is provided with an area for accommodating the coaxial cable interface 6, the two areas are not electrically connected with each other, and the coaxial cable interface 6 is positioned in the middle of the substrate 1.
The first balanced feed connection 31 is L-shaped and the second balanced feed connection 32 is located at one side of the coaxial cable interface 6 and below the first antenna element interface 21. Referring to fig. 2, the serpentine-shaped balanced feeding line of the second balanced feeding line 32 includes two arc-shaped balanced feeding lines 321 and 322 and an S-shaped balanced feeding line 323 connected between the two arc-shaped balanced feeding lines 321 and 322, and a line distance is increased at a turning point of the S-shaped balanced feeding line 323. Straight balanced feed lines 324 and 325 are led out from the arc balanced feed lines 321 and 322, and in combination with fig. 1, the straight balanced feed line 325 is connected with the first antenna element interface 21, and the end of the first balanced feed line 31 is bent upwards to be connected with the straight balanced feed line 324 of the second balanced feed line 32.
The balanced feed connection line and the grounding metal area 4 have close electromagnetic coupling between the edges of the metal conductors, so that high-frequency electromagnetic radiation of the balanced feed connection line can be shielded; the shielding metal region 5 can not only isolate the interference of external energy to the signal on the balanced feed line, but also prevent the signal energy on the balanced feed line from radiating outwards, and the dual protection function can reduce the signal energy loss.
And the first antenna element interface 21 and the second antenna element interface 22 both adopt large-area copper-clad treatment. One end of the first antenna element interface 21 copper-clad area close to the coaxial cable interface 6 is connected with the lower coaxial cable interface 6 through a section of connecting wire 7, and the connecting angle between the connecting wire 7 and the first antenna element interface 21 copper-clad area is arc-shaped.
One end of the copper-clad area of the first antenna element interface 21 close to the edge of the substrate 1 is connected with one end of the second balanced feed connecting wire 32 below, and one end of the copper-clad area of the second antenna element interface 22 close to the edge of the substrate 1 is connected with one end of the first balanced feed connecting wire 31 below.
In fig. 1, two antenna element interfaces 21 and 22 are provided with through holes 8 symmetrically arranged for connecting metal devices of the antenna elements, a coaxial cable interface 6 is connected with a coaxial cable or an "F-head" connector, and a shielding layer of the coaxial cable is connected with a grounding metal area 4.
In fig. 1, the through hole 8 may be subjected to a tin-plating process, and a tin layer may be formed around the through hole 8, and the tin layer may be a dot-shaped tin layer or a circular tin layer.
The circuit board described in this embodiment is used as a balance-unbalance converter for an antenna, realizes a balun function, has a small size, greatly reduces the structure and the volume of an antenna oscillator, has a good matching effect and low loss, and can be used for an UHF frequency band antenna.
The antenna element circuit board and the antenna provided by the embodiment of the utility model are described in detail, a specific example is applied in the description to explain the structure of the utility model, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, there may be variations to the specific embodiments according to the idea of the present invention, and as described above, the content of the present specification should not be construed as limiting the present invention.
Claims (10)
1. An antenna oscillator circuit board comprises a substrate and a metal circuit printed on the upper layer of the substrate, wherein the bottom layer of the substrate is a nonmetal bottom layer, the metal circuit comprises two antenna oscillator interfaces, a balanced feed connecting line connected between the two antenna oscillator interfaces, a grounding metal area surrounded by the balanced feed connecting line and a coaxial cable interface, a gap is formed between the balanced feed connecting line and the grounding metal area and is not electrically connected with each other, and a first antenna oscillator interface is connected with the coaxial cable interface; the grounding metal area is provided with an area for accommodating a coaxial cable interface, the grounding metal area and the area are not electrically connected with each other, the metal circuit further comprises a shielding metal area, the shielding metal area and the grounding metal area are positioned at two sides of the balanced feed connecting line, a gap is arranged between the balanced feed connecting wire and the shielding metal area and is not electrically connected with each other, the balanced feed connecting wire comprises a first balanced feed connecting wire and a second balanced feed connecting wire, the first balanced feed connection is L-shaped, the second balanced feed connection comprises a serpentine balanced feed connection, one end of the first balanced feed connecting wire is connected with the second antenna element interface, the other end of the first balanced feed connecting wire is connected with one end of the second balanced feed connecting wire, the other end of the second balanced feed connecting line is connected with the first antenna element interface, and the line width of the first balanced feed connecting line is different from the line width of the second balanced feed connecting line.
2. The antenna element circuit board of claim 1, wherein a line width of the first balanced feed line is larger than a line width of the second balanced feed line.
3. The antenna element circuit board of claim 1 or 2, wherein the serpentine balanced feed line of the second balanced feed line comprises two curved balanced feed lines and an S-shaped balanced feed line, the S-shaped balanced feed line is connected between the two curved balanced feed lines, and a line pitch is increased at a turning point of the S-shaped balanced feed line.
4. The antenna element circuit board of claim 3, wherein a straight balanced feed line is led out from the two arc-shaped balanced feed lines of the second balanced feed line and is respectively connected with the first balanced feed line and the first antenna element interface.
5. The antenna element circuit board of claim 4, wherein the shield metal region is located on one side of the second balanced feed connection.
6. The antenna element circuit board of claim 5, wherein two antenna element interfaces are arranged above the substrate, the two antenna element interfaces are both processed by large-area copper-clad, a copper-clad area of the first antenna element interface is connected with the lower coaxial cable interface through a connecting line, and the connecting angle between the connecting line and the copper-clad area of the first antenna element interface is arc-shaped.
7. The antenna element circuit board of claim 6, wherein an end portion of the first balanced feed line is bent upward to be connected to the straight balanced feed line of the second balanced feed line.
8. The antenna element circuit board of claim 7, wherein the turning angles of the balanced feeding wires are arc-shaped.
9. The antenna element circuit board of claim 8, wherein the coaxial cable interface is located in the middle of the substrate, and the second balanced feed line is located on one side of the coaxial cable interface and below the first antenna element interface.
10. An antenna comprising the antenna element circuit board according to any one of claims 1 to 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122769983 | 2021-11-12 | ||
| CN2021227699833 | 2021-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216354805U true CN216354805U (en) | 2022-04-19 |
Family
ID=81167093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220071405.4U Active CN216354805U (en) | 2021-11-12 | 2022-01-12 | Antenna element circuit board and antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216354805U (en) |
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2022
- 2022-01-12 CN CN202220071405.4U patent/CN216354805U/en active Active
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