CN219892399U - Integrated on board dual-frequency antenna design structure - Google Patents
Integrated on board dual-frequency antenna design structure Download PDFInfo
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- CN219892399U CN219892399U CN202320238012.2U CN202320238012U CN219892399U CN 219892399 U CN219892399 U CN 219892399U CN 202320238012 U CN202320238012 U CN 202320238012U CN 219892399 U CN219892399 U CN 219892399U
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- 238000013461 design Methods 0.000 title claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000017525 heat dissipation Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- UFNIBRDIUNVOMX-UHFFFAOYSA-N 2,4'-dichlorobiphenyl Chemical compound C1=CC(Cl)=CC=C1C1=CC=CC=C1Cl UFNIBRDIUNVOMX-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
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Abstract
The utility model discloses an integrated on-board dual-frequency antenna design structure which comprises a PCB board, two dual-frequency on-board PCB antennas and a radio frequency matching circuit, wherein the radio frequency matching circuit is arranged on the PCB board, the two dual-frequency on-board PCB antennas are arranged on two sides of the PCB board, an isolation area is arranged between the two dual-frequency on-board PCB antennas, a copper laying clearance area is arranged between a dual-antenna main body and a ground plane of the PCB board, occupation of a heat dissipation area of a host surface is reduced to the greatest extent, heat dissipation of a small-size host is very beneficial, the built-in on-board dual-antenna of the PCB is produced at one time when the PCB board is manufactured, material cost and production cost are saved, consistency is guaranteed, and the integrated on-board dual-frequency antenna design structure is suitable for mass production.
Description
Technical Field
The utility model belongs to the technical field of vehicle-mounted system antennas, and particularly relates to an integrated on-board dual-frequency antenna design structure.
Background
At present, the vehicle-mounted terminal products are more and more competitive, the control of the product cost becomes an important guide in research and development design, the antenna is an essential application device, and in order to reduce the cost and the PCB volume, the performance of wireless signal transmission is ensured, and more excellent PCB antenna design is needed.
The BT/WiFi dual-frequency antenna matching mode of the existing vehicle-mounted terminal system is approximately divided into two connection modes, one is an external scheme, a special antenna connector is welded on a PCB, radio frequency signals are accessed into the whole machine through the connector, and an antenna is fixed on a host shell; another is a special radio frequency receiving device for PCB soldering. Both schemes require special antenna components to be welded or inserted into a PCB, so that the whole machine is high in cost, high in difficulty in structural design, and inconvenient to produce, debug and follow.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides the on-board PCB dual-antenna matched with the dual-frequency BT/WIFI module, which has small volume and good performance, does not occupy the external space of a host, and does not need to consider the installation and fixing modes.
Aiming at the application of 2.4G and 5G frequency bands of the prior BT/WIFI, the antenna is directly designed on the PCB, and the antenna is produced once when being manufactured, so that a plurality of production procedures and additional assembly cost are saved, and the production cost is effectively saved; and the production, debugging and consistency are guaranteed, so that the problem that the traditional equipment is inconvenient to produce, debug and install in the background technology is solved.
The utility model is as follows: the utility model provides an integrated on board dual-frenquency antenna design structure, the structure includes PCB board, two dual-frenquency board carry PCB antenna and radio frequency matching network circuit, radio frequency matching network circuit sets up on the PCB board, two dual-frenquency board carries PCB antenna setting is in the both sides of PCB board, two be provided with the isolation zone between the dual-frenquency board carries PCB antenna, still be provided with on the PCB board and spread copper clearance area.
As an improvement of the utility model, each PCB antenna comprises a low-frequency antenna arm, a high-frequency antenna arm, a ground plane and an FB feed point, copper wiring is paved on the front surface of the PCB, the back surface of the PCB is blank, and the PCB antenna is connected with a double-frequency BT/WIFI module (module connected by the antenna) after an impedance line is led to the PCB through the FB feed point and passes through a radio-frequency matching network circuit.
As an improvement of the utility model, the low-frequency antenna arm and the high-frequency antenna arm are connected with the double-frequency BT/WIFI module through the feed point and the impedance line and the radio frequency matching network circuit.
As an improvement of the utility model, a copper laying clearance area is arranged between the double-antenna main body and the ground plane of the PCB.
As an improvement of the utility model, the radio frequency matching network circuit comprises a resistor connected in series and a pi-shaped network circuit at the subsequent stage, wherein the pi-shaped network circuit comprises a capacitor connected in series to the resistor and an inductor connected in parallel to ground.
As an improvement of the utility model, the resonant length of the dual-frequency on-board PCB antenna meets the 1/4 lambda wavelength of the resonant frequency.
As an improvement of the utility model, the two double-frequency on-board PCB antennas are arranged in parallel.
As an improvement of the present utility model, the PCB impedance line is 50Ω.
Compared with the prior art, the utility model has the beneficial effects that: the BT and WIFI antennas are designed to be On-board double-frequency double antennas, the two antennas are arranged in parallel, and the BT and WIFI antennas are connected with a BT/WiFi module through a matching network, so that the data receiving and transmitting functions of BT/WiFi wireless signals are realized. Through HFSS simulation, the PCB layout design, performance index test and the like ensure the radio frequency comprehensive performance. Can meet various application scenes in the client vehicle and has the following advantages:
1) The WiFi module realizes data receiving and transmitting through the two double-frequency on-board PCB antennas, so that the WIFI signal coverage is better, and the stability of WiFi connection equipment is improved;
2) The occupation of the heat dissipation area of the surface of the host is reduced to the maximum extent, and the heat dissipation of the small-size host is very beneficial;
3) The On Board double antenna is arranged in the PCB, and the On Board double antenna is produced at one time when the PCB is manufactured, so that the material cost and the production cost are saved, the consistency is ensured, and the On Board double antenna is suitable for mass production.
Drawings
Fig. 1 is a schematic diagram of an integrated On Board dual-band dual-antenna main body structure.
Fig. 2 is a schematic diagram of the dimensions of an integrated On Board dual-band dual-antenna body.
Fig. 3 is a simulation test result of return loss of the first and second integrated On Board dual-band dual-antenna antennas.
Fig. 4 is a graph of isolation between integrated On Board dual-frequency dual antennas.
Fig. 5 is a schematic diagram of a radio frequency matching circuit.
List of drawing identifiers: 1-clearance area, 2-first dual-frequency on-board PCB antenna, 3-second dual-frequency on-board PCB antenna, 4-first feed point, 5-second feed point, 6-ground copper sheet, 7-isolation area, 8-PCB board, 9-PCB inboard copper laying area, 10-first radio frequency matching circuit, 11-second radio frequency matching circuit, 12-first low frequency antenna arm, 13-first high frequency antenna arm, 14-second low frequency antenna arm, 15-second high frequency antenna arm, 16-first impedance line, 17-second impedance line.
Detailed Description
The present utility model is further illustrated in the following drawings and detailed description, which are to be understood as being merely illustrative of the utility model and not limiting the scope of the utility model.
Examples: as shown in fig. 1, an integrated On Board dual-frequency dual-antenna design comprises a PCB 8, two dual-frequency On-Board PCB antennas and a radio frequency matching circuit, wherein the matching circuit is welded On the PCB 8, the two dual-frequency On-Board PCB antennas are integrated at the edge of the PCB 8 and are arranged in parallel, an isolation area 7 is arranged in the middle, and a copper-spreading clearance area 1 is arranged between the whole dual-antenna main body and the ground plane of the PCB 8. Each onBoard PCB antenna comprises a low-frequency antenna arm, a high-frequency antenna arm, a ground plane and an FB feed point, and copper wires are paved on the front surface of the PCB, and the back surface is blank. The PCB antenna is connected with the electrical element of the matching network through the FB feed point leading-in PCB wire, and then is electrically connected with a double-frequency BT/WIFI module (the module connected with the antenna is not marked in the drawing).
Further, the low-frequency antenna arm and the high-frequency antenna arm reach the WiFi module through the impedance matching network by the feed point and the 50 omega PCB impedance line. The three main structural parameters of the low-frequency antenna arm and the high-frequency antenna arm are respectively the resonant length L, the height H of the antenna and the distance between a feed point and a grounding point, namely the distance S between two vertical arms; the resonant length L is used for adjusting the working frequency of the antenna, the shorter the resonant length L is, the higher the frequency is, the resonant length of the dual-frequency on-board PCB antenna meets the 1/4 lambda wavelength of the resonant frequency, and the resonant frequency is transmitted to the length L of the low-frequency antenna arm and the high-frequency antenna arm through the feed point to be transmitted and received; the change trend of the frequency and the impedance of the antenna in the frequency band depends on H and S, the antenna height H can be used for adjusting the bandwidth of the antenna, and the larger the H is, the larger the bandwidth is; s is used for adjusting the input impedance of the antenna, and the smaller S is, the larger the impedance is, namely S can be directly used for adjusting the VSWR performance of the antenna.
Fig. 2 is a dimension diagram of the PCB antenna in the present embodiment.
Fig. 3 is a simulation test result of the return loss VSWR of the first antenna (S11) and the second antenna (S22) of the dual-frequency on-board PCB in the present embodiment. The two antennas can obviously meet the requirements at resonance points of 2400 MHz-2500 MHz and 5150 MHz-5850 MHz and return loss.
Fig. 4 is a graph of isolation between two antennas of the dual-band on-board PCB antenna in this embodiment (S12). As can be seen from the graph, the isolation of the two antennas is more than 26dB in the resonance point range of 2400 MHz-2500 MHz and 5150 MHz-5850 MHz.
Fig. 3 to 4 are plotted on the abscissa as Frequency (start 2GHz, stop 6 GHz) and on the ordinate as dB.
Fig. 5 is an impedance matching network in the present embodiment. And the 0 omega resistor (R1, R2) is connected in series with a pi-shaped network of a later stage. The parameters of the pi-shaped network are adjusted according to actual tests, and one parameter of the dual-frequency antenna is adjusted to be connected with C1=1.5pF in series and connected with an L1=2.2nH inductor in parallel; the second dual-frequency antenna is adjusted to be connected in parallel to the ground inductance L2=1.5nH by adding a pair to the series resistance R3=0Ω.
The embodiment successfully passes the throughput test and the packet loss rate test of the WiFi transmission distance of 10m in the practical project. Meanwhile, the video is transmitted through the WiFi signal, and the maximum transmission distance can reach 70 meters under the condition that video playing is not blocked; the maximum transmission distance of the BT signals reaches 20 meters, and the transmission distance requirements of the vehicle-mounted equipment can be completely met in two working modes.
In the embodiment, the WiFi module realizes data receiving and transmitting through the two double-frequency on-board PCB antennas, so that the coverage of the WIFI signals is better, and the stability of the WiFi connection equipment is improved; the occupation of the heat dissipation area of the surface of the host is reduced to the maximum extent, and the heat dissipation of the small-size host is very beneficial; the On Board double antenna is arranged in the PCB, and the On Board double antenna is produced at one time when the PCB is manufactured, so that the material cost and the production cost are saved, the consistency is ensured, and the On Board double antenna is suitable for mass production.
It should be noted that the foregoing merely illustrates the technical idea of the present utility model and is not intended to limit the scope of the present utility model, and that a person skilled in the art may make several improvements and modifications without departing from the principles of the present utility model, which fall within the scope of the claims of the present utility model.
Claims (8)
1. The utility model provides an integrated on board dual-frenquency antenna design structure, its characterized in that, the structure includes PCB board, two dual-frenquency board carry PCB antenna and radio frequency matching network circuit, the radio frequency matching network circuit sets up on the PCB board, two dual-frenquency board carries PCB antenna setting is in the both sides of PCB board, two be provided with the isolation zone between the dual-frenquency board carries PCB antenna, still be provided with on the PCB board and spread copper clearance area.
2. The integrated on-board dual-band antenna design structure of claim 1, wherein each of the PCB antennas comprises a low-frequency antenna arm, a high-frequency antenna arm, a ground plane and an FB feed point, a copper wiring is laid on the front surface of the PCB, the back surface of the PCB is blank, and the PCB antenna is connected with the dual-frequency BT/WIFI module after passing through a radio-frequency matching network circuit by the FB feed point leading to an impedance line.
3. The integrated on-board dual-band antenna design structure of claim 2, wherein the low-frequency antenna arm and the high-frequency antenna arm are connected with the dual-frequency BT/WIFI module through the impedance line and the rf matching network circuit through the feed point.
4. An integrated on-board dual-band antenna design structure according to claim 3, wherein a copper clearance is provided between the dual-antenna body and the ground plane of the PCB.
5. The integrated on-board dual-band antenna design structure of claim 4, wherein the rf matching network circuit comprises a series resistor and a subsequent pi-network circuit, the pi-network circuit comprising an inductor connected in series to the resistor or capacitor and connected in parallel to ground.
6. The integrated on-board dual-band antenna design structure of claim 5, wherein the resonant length of the dual-band on-board PCB antenna satisfies 1/4 λ wavelength of the resonant frequency.
7. The integrated on-board dual-band antenna design structure of claim 6, wherein two of said dual-band on-board PCB antennas are arranged in parallel.
8. The integrated on-board dual-band antenna design structure of claim 7, wherein the PCB impedance line is 50Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320238012.2U CN219892399U (en) | 2023-02-17 | 2023-02-17 | Integrated on board dual-frequency antenna design structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320238012.2U CN219892399U (en) | 2023-02-17 | 2023-02-17 | Integrated on board dual-frequency antenna design structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219892399U true CN219892399U (en) | 2023-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320238012.2U Active CN219892399U (en) | 2023-02-17 | 2023-02-17 | Integrated on board dual-frequency antenna design structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219892399U (en) |
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2023
- 2023-02-17 CN CN202320238012.2U patent/CN219892399U/en active Active
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