CN216120763U - Low-SAR dual-frequency antenna and electronic equipment - Google Patents
Low-SAR dual-frequency antenna and electronic equipment Download PDFInfo
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- CN216120763U CN216120763U CN202122051568.4U CN202122051568U CN216120763U CN 216120763 U CN216120763 U CN 216120763U CN 202122051568 U CN202122051568 U CN 202122051568U CN 216120763 U CN216120763 U CN 216120763U
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Abstract
The utility model discloses a low-SAR dual-frequency antenna and electronic equipment, which comprise a substrate, a radiator and a metal branch, wherein the radiator and the metal branch are respectively arranged on the substrate, and the metal branch is positioned on one side of the radiator; the radiator is a loop antenna with a first frequency band frequency and a second frequency band frequency, and the metal branch is coupled with the radiator. The utility model can realize double frequency and reduce SAR.
Description
Technical Field
The utility model relates to the technical field of wireless communication, in particular to a low-SAR dual-frequency antenna and electronic equipment.
Background
At present, terminal equipment increasingly focuses on appearance and is developing towards miniaturization, so that the wiring area of an antenna is smaller and smaller, the clearance is worse and worse, the efficiency of the antenna is not high, especially the bandwidth is not enough, and the OTA performance is difficult to reach indexes. In addition, in order to implement dual-frequency or multi-frequency, multiple antenna arms or parasitic branches are often required to be arranged, but these methods all result in a higher SAR (Specific Absorption Rate). If SAR is reached by reducing the input power, the radiation power of the antenna cannot reach the standard. Therefore, how to make the radiation power of the antenna reach the standard and meet the index of the SAR becomes the problem to be solved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: provided are a low-SAR dual-band antenna and an electronic device, which can realize dual-band and reduce SAR.
In order to solve the technical problems, the utility model adopts the technical scheme that: a low-SAR dual-frequency antenna comprises a substrate, a radiator and metal branches, wherein the radiator and the metal branches are respectively arranged on the substrate, and the metal branches are positioned on one side of the radiator; the radiator is a loop antenna with a first frequency band frequency and a second frequency band frequency, and the metal branch is coupled with the radiator.
Furthermore, the radiator comprises a feed branch, an annular branch and a ground branch, the annular branch is rectangular with an opening, the annular branch comprises a first branch, a second branch, a third branch, a fourth branch and a fifth branch which are sequentially connected, one end of the first branch, which is far away from the second branch, is connected with one end of the feed branch, and one end of the fifth branch, which is far away from the fourth branch, is connected with one end of the ground branch;
the total length of the radiator is lambda1/4-λ1/2，λ1The wavelength length is corresponding to the first frequency band; the total length of the feed branch and the first branch is lambda2/8-λ2/4，λ2Is the wavelength length corresponding to the second frequency band.
Further, the metal branch is in an inverted L shape.
Furthermore, the metal branches comprise a sixth branch and a seventh branch which are connected in sequence, and the length of the seventh branch is greater than that of the sixth branch; the distance between the sixth branch and the radiator is 3-10mm, and the distance between the seventh branch and the radiator is less than or equal to 0.5 mm.
Further, the metal branch is disposed near a third branch and a fourth branch of the radiator; the distance between the sixth branch and the fourth branch is 3-10mm, and the distance between the seventh branch and the third branch is less than or equal to 0.5 mm.
Furthermore, an antenna feed point and an antenna grounding point are arranged on the substrate, the other end of the feed branch is connected with the antenna feed point, and the other end of the grounding branch is connected with the antenna grounding point.
The antenna further comprises a mainboard, a first elastic sheet and a second elastic sheet, wherein the mainboard is provided with a signal source, an antenna ground, a first microstrip line and a second microstrip line; the other end of the feed branch is connected with one end of the first microstrip line through the first elastic sheet, and the other end of the first microstrip line is connected with the signal source; the other end of the grounding branch is connected with one end of the second microstrip line through the second elastic sheet, and the other end of the second microstrip line is connected with the antenna ground.
Further, the total length of the metal branch is 24.14 mm.
Further, the first frequency band is a 2.4GHz frequency band, and the second frequency band is a 5.5GHz frequency band.
The utility model also provides an electronic device comprising the low-SAR dual-frequency antenna.
The utility model has the beneficial effects that: the radiator is arranged to generate resonance in two different frequency bands, so that double frequency is realized; the metal branches are arranged around the radiator, so that the metal branches and the radiator form coupling to participate in radiation together, the current on the radiator is reduced, the radiation area of the antenna is increased, the field intensity towards the radiation direction of a human body is weakened, and the purpose of reducing the SAR value is achieved; the efficiency of the antenna in two frequency bands can be adjusted by adjusting the length of the metal branch, so that the radiation power index of the antenna and the SAR index can be simultaneously met; in addition, the utility model has simple structure, low process requirement and good assembly consistency.
Drawings
Fig. 1 is a schematic structural diagram of a low-SAR dual-band antenna according to a first embodiment of the present invention;
fig. 2 is a schematic connection diagram of a low-SAR dual-band antenna and a spring plate according to a first embodiment of the present invention;
FIG. 3 is a graph of antenna efficiency before and after adding metal branches;
FIG. 4 is a SAR heat map at 5.18GHz for an antenna with metal branches;
fig. 5 is a SAR hotspot graph at 5.18GHz for an antenna without metal branches.
Description of reference numerals:
1. a substrate; 2. a radiator; 3. metal branching; 4. an antenna feed point; 5. an antenna ground point; 6. a first spring plate; 7. a second elastic sheet;
21. a feed branch; 22. a first branch; 23. a second branch; 24. a third branch; 25. a fourth branch; 26. a fifth branch; 27. a ground branch;
31. a sixth branch; 32. and a seventh branch.
Detailed Description
In order to explain technical contents, objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, a low SAR dual-band antenna includes a substrate, a radiator and a metal branch, where the radiator and the metal branch are respectively disposed on the substrate, and the metal branch is located at one side of the radiator; the radiator is a loop antenna with a first frequency band frequency and a second frequency band frequency, and the metal branch is coupled with the radiator.
From the above description, the beneficial effects of the present invention are: the antenna can simultaneously meet the radiation power index and SAR index of the antenna, and has simple structure, low process requirement and good assembly consistency.
Furthermore, the radiator comprises a feed branch, an annular branch and a ground branch, the annular branch is rectangular with an opening, the annular branch comprises a first branch, a second branch, a third branch, a fourth branch and a fifth branch which are sequentially connected, one end of the first branch, which is far away from the second branch, is connected with one end of the feed branch, and one end of the fifth branch, which is far away from the fourth branch, is connected with one end of the ground branch;
the total length of the radiator is lambda1/4-λ1/2，λ1The wavelength length is corresponding to the first frequency band; the total length of the feed branch and the first branch is lambda2/8-λ2/4，λ2Is the wavelength length corresponding to the second frequency band.
As can be seen from the above description, the frequency offset of the two resonances is controlled by adjusting the size of the radiator, and the bandwidth of the loop antenna is larger than that of an antenna provided with multiple antenna arms or parasitic branches.
Further, the metal branch is in an inverted L shape.
Furthermore, the metal branches comprise a sixth branch and a seventh branch which are connected in sequence, and the length of the seventh branch is greater than that of the sixth branch; the distance between the sixth branch and the radiator is 3-10mm, and the distance between the seventh branch and the radiator is less than or equal to 0.5 mm.
Further, the metal branch is disposed near a third branch and a fourth branch of the radiator; the distance between the sixth branch and the fourth branch is 3-10mm, and the distance between the seventh branch and the third branch is less than or equal to 0.5 mm.
From the above description, it can be known that the field strength in the direction of human body radiation can be reduced by disposing metal branches around the radiator, thereby achieving the purpose of reducing the SAR value.
Furthermore, an antenna feed point and an antenna grounding point are arranged on the substrate, the other end of the feed branch is connected with the antenna feed point, and the other end of the grounding branch is connected with the antenna grounding point.
The antenna further comprises a mainboard, a first elastic sheet and a second elastic sheet, wherein the mainboard is provided with a signal source, an antenna ground, a first microstrip line and a second microstrip line; the other end of the feed branch is connected with one end of the first microstrip line through the first elastic sheet, and the other end of the first microstrip line is connected with the signal source; the other end of the grounding branch is connected with one end of the second microstrip line through the second elastic sheet, and the other end of the second microstrip line is connected with the antenna ground.
According to the description, the feeding and grounding are realized through the elastic sheet on the main board, and the whole machine assembly is facilitated.
Further, the total length of the metal branch is 24.14 mm.
From the above description, it can be seen that by optimizing the length of the metal branch, the efficiency of the antenna in both frequency bands can be adjusted.
Further, the first frequency band is a 2.4GHz frequency band, and the second frequency band is a 5.5GHz frequency band.
The utility model also provides an electronic device comprising the low-SAR dual-frequency antenna.
Example one
Referring to fig. 1-5, a first embodiment of the present invention is: a low-SAR dual-frequency antenna can be applied to a miniaturized tablet computer.
As shown in fig. 1, the antenna comprises a substrate 1, a radiator 2 and a metal branch 3, wherein the radiator 2 and the metal branch 3 are respectively disposed on the substrate 1, and the metal branch 3 is located on one side of the radiator 2.
Wherein, the substrate 1 is an FPC board; the radiator 2 is an annular antenna, and has two frequencies of different frequency bands, that is, the radiator can be used for receiving and transmitting a signal of a first frequency band and a signal of a second frequency band, in this embodiment, the first frequency band is a 2.4GHz frequency band, and the second frequency band is a 5.5GHz frequency band, that is, two frequency bands of WiFi. That is, the present embodiment implements a dual-band WiFi antenna.
Further, the radiator 2 includes a feeding branch 21, a loop branch and a ground branch 27, the loop branch is rectangular with an opening, and two ends of the opening are respectively connected with the feeding branch 21 and the ground branch 27. Specifically, the annular branch includes a first branch 22, a second branch 23, a third branch 24, a fourth branch 25 and a fifth branch 26 which are connected in sequence, wherein one end of the first branch 22 far away from the second branch 23 is connected with one end of the feeding branch 21, and one end of the fifth branch 26 far away from the fourth branch 25 is connected with one end of the grounding branch 27. That is, the feed branch 21, the first branch 22, the second branch 23, the third branch 24, the fourth branch 25, the fifth branch 26, and the ground branch 27 are connected in this order to form a square loop antenna.
Furthermore, an antenna feeding point 4 and an antenna grounding point 5 are arranged on the substrate 1, the other end of the feeding branch 21 is connected with the antenna feeding point 4, and the other end of the grounding branch 27 is connected with the antenna grounding point 5.
The total length of the radiator and the total length of the feed branch and the first branch are influenced by the dielectric constant of the antenna support (i.e. the substrate) and the surrounding environment, and preferably, the total length of the radiator is λ1/4-λ1/2，λ1The wavelength length is corresponding to the first frequency band; the total length of the feed branch and the first branch is lambda2/8-λ2/4，λ2Is the wavelength length corresponding to the second frequency band.
In this embodiment, the total length of the radiator is between one quarter wavelength and one half wavelength of the 2.4GHz band, i.e. 30mm-60mm, and preferably, the total length of the radiator is 45 mm. The total length of the feed branch and the first branch is between one eighth and one quarter wavelength, i.e. 6.8mm-13.6mm, of the 5.5GHz band. Preferably, the length of the feed branch is 7mm and the length of the first branch is 3 mm.
In a specific application scenario, since the antenna is widened due to the increase of the feeding branch, and the trace area is increased, preferably, the length of the first branch should be controlled within 6.6mm by adjusting the length of the first branch to control the 5G resonance.
In this embodiment, the whole radiator is used as the radiator of the 2.4G WiFi antenna, and the feed branch and the first branch are used as the radiators of the 5G WiFi antenna. By adjusting the total length of the radiator, 2.4G resonance can be controlled, and by adjusting the total length of the feed branch and the first branch in the radiator, 5G resonance can be controlled, and the bandwidth of the generated resonance is sufficient to cover all frequency bands of WiFi.
In other embodiments, the second branch may also be used as a radiator of a 5G WiFi antenna, in which case the total length of the feeding branch, the first branch and the second branch is between one eighth wavelength and one quarter wavelength of the 5.5GHz band, and the feeding branch, the first branch and the second branch may be combined into one strip-shaped branch.
Further, the metal branch 3 is in the shape of an inverted L, and preferably, the metal branch 3 is disposed near the third branch 24 and the fourth branch 25 of the radiator 2. The distance between the long edge of the metal branch 3 and the radiator 2 is within 0.5mm to ensure sufficient coupling, and preferably, the distance is 0.3 mm; the distance between the short side of the metal branch 3 and the radiator 2 is 3-10 mm.
In the present embodiment, the metal branch 3 has a total length of about 24.14mm, and includes a sixth branch 31 and a seventh branch 32 connected in sequence, and the sixth branch 31 is perpendicular to the seventh branch 32, wherein the length of the seventh branch 32 is greater than the length of the sixth branch 31. The sixth branch 31 is close to the fourth branch 25 of the radiator 2 and parallel to the fourth branch 25, the distance between the sixth branch 31 and the fourth branch 25 being 3-10 mm; the seventh branch 32 is close to the third branch 24 of the radiator 2 and parallel to the third branch 24, the distance between the seventh branch 32 and the third branch 24 being 0.3 mm.
The metal branches are arranged around the radiator, so that the metal branches and the radiator are coupled to participate in radiation together, the current on the radiator is reduced, the radiation area of the antenna is increased, the field intensity towards the radiation direction of a human body is weakened, and the purpose of reducing the SAR value is achieved.
As shown in fig. 2, the antenna structure of the present embodiment can be connected to the signal source and the antenna ground on the terminal motherboard through two elastic pieces, respectively, so as to achieve the complete machine assembly. Specifically, the antenna further comprises a main board (not shown in the figure), a first elastic sheet 6 and a second elastic sheet 7, wherein the main board is provided with a signal source, an antenna ground, a first microstrip line and a second microstrip line, the first microstrip line is connected with the signal source, and the second microstrip line is connected with the antenna ground; the other end of the feed branch 21 is connected with the first elastic sheet 6 and is connected with a signal source through the first elastic sheet 6 and the first microstrip line in sequence so as to realize antenna feed; the other end of the grounding branch 27 is connected with the second elastic sheet 7 and is connected with the antenna ground through the second elastic sheet 7 and the second microstrip line in sequence.
The first elastic sheet and the second elastic sheet can be respectively and directly connected with the feeding branch and the grounding branch, and can also be respectively connected with an antenna feeding point and a grounding feeding point on the substrate.
Fig. 3 is a graph of antenna efficiency before and after adding a metal branch, where a dotted line indicates the antenna efficiency with a metal branch provided and a solid line indicates the antenna efficiency without a metal branch provided. Table 1 shows SAR values of different frequency band channels before and after adding a metal branch.
Table 1:
| frequency (GHz) | Channel with a plurality of channels | SAR (W/KG) without metal branch | SAR with metal branch (W/KG) |
| 5.18 | 36 | 3.88 | 1.92 |
| 5.24 | 48 | 3.9 | 1.87 |
| 5.75 | 100 | 2.44 | 1.75 |
| 5.83 | 165 | 2.47 | 1.76 |
As can be seen from fig. 3 and table 1, after the metal branches are arranged, the efficiency of the 2.4G frequency band can be improved by about 1dB, the average efficiency of the 5G frequency band is reduced by about 0.5dB, and the efficiencies of the 2.4G WiFi frequency band and the 5G WiFi frequency band can be adjusted by adjusting the lengths of the metal branches; the SAR values for 36 and 48 channels of the 5G WiFi band may be reduced by 50%, and for 100 and 165 channels by 30%. Under the condition that the average efficiency of the 5G frequency band is only reduced by 0.5dB, the antenna efficiency is still about-3 dB, the index of the antenna efficiency can still be met, and the SAR value in the 5G frequency band has obvious amplitude reduction, so that the index of the antenna radiation power can be met, and the requirement of the SAR can also be met.
Fig. 4 and 5 are SAR hotspot diagrams of the antenna with and without the metal branch at 5.18GHz, respectively, and it can be seen from fig. 4-5 that the hotspots are obviously dispersed after the metal branch is arranged.
The embodiment can simultaneously meet the radiation power index of the antenna and the index of the SAR, has a simple structure, can sample the radiating body and the metal branch on the same FPC, and facilitates the assembly of the whole machine through the elastic piece feeding on the mainboard.
In summary, the dual-band antenna and the electronic device with low SAR provided by the present invention have the advantages that the radiator is arranged to generate resonance in two different frequency bands, so as to realize dual-band; the frequency deviation of two resonances is controlled by adjusting the size of the radiator, and the bandwidth is larger compared with an antenna provided with a plurality of antenna arms or parasitic branches; the metal branches are arranged around the radiator, so that the metal branches and the radiator form coupling to participate in radiation together, the current on the radiator is reduced, the radiation area of the antenna is increased, the field intensity towards the radiation direction of a human body is weakened, and the purpose of reducing the SAR value is achieved; the efficiency of the antenna in two frequency bands can be adjusted by adjusting the length of the metal branch, so that the radiation power index of the antenna and the SAR index can be simultaneously met; simple structure can make a design with irradiator and metal branch on same FPC, and the shell fragment feed on the rethread mainboard makes things convenient for the complete machine to assemble.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. The low-SAR dual-frequency antenna is characterized by comprising a substrate, a radiator and a metal branch, wherein the radiator and the metal branch are respectively arranged on the substrate, and the metal branch is positioned on one side of the radiator; the radiator is a loop antenna with a first frequency band frequency and a second frequency band frequency, and the metal branch is coupled with the radiator.
2. The dual-band antenna with low SAR as claimed in claim 1, wherein the radiator comprises a feeding branch, a loop branch and a grounding branch, the loop branch is rectangular with an opening, the loop branch comprises a first branch, a second branch, a third branch, a fourth branch and a fifth branch which are connected in sequence, one end of the first branch far away from the second branch is connected with one end of the feeding branch, and one end of the fifth branch far away from the fourth branch is connected with one end of the grounding branch;
the total length of the radiator is lambda1/4-λ1/2，λ1The wavelength length is corresponding to the first frequency band; the total length of the feed branch and the first branch is lambda2/8-λ2/4，λ2Is the wavelength length corresponding to the second frequency band.
3. The low SAR dual-band antenna according to claim 2, wherein the metal branch is in an inverted L shape.
4. The low-SAR dual-band antenna according to claim 3, wherein the metal branch comprises a sixth branch and a seventh branch which are connected in sequence, and the length of the seventh branch is greater than that of the sixth branch; the distance between the sixth branch and the radiator is 3-10mm, and the distance between the seventh branch and the radiator is less than or equal to 0.5 mm.
5. The low-SAR dual-band antenna according to claim 4, wherein the metal branch is disposed close to a third branch and a fourth branch of the radiator; the distance between the sixth branch and the fourth branch is 3-10mm, and the distance between the seventh branch and the third branch is less than or equal to 0.5 mm.
6. The low-SAR dual-band antenna according to claim 2, wherein an antenna feeding point and an antenna grounding point are disposed on the substrate, the other end of the feeding branch is connected to the antenna feeding point, and the other end of the grounding branch is connected to the antenna grounding point.
7. The dual-band antenna with low SAR of claim 2, characterized in that, further comprising a main board, a first spring and a second spring, wherein the main board is provided with a signal source, an antenna ground, a first microstrip line and a second microstrip line; the other end of the feed branch is connected with one end of the first microstrip line through the first elastic sheet, and the other end of the first microstrip line is connected with the signal source; the other end of the grounding branch is connected with one end of the second microstrip line through the second elastic sheet, and the other end of the second microstrip line is connected with the antenna ground.
8. The low SAR dual-band antenna according to claim 1, wherein the total length of the metal branch is 24.14 mm.
9. The low-SAR dual-band antenna according to any one of claims 1 to 8, wherein the first band is a 2.4GHz band and the second band is a 5.5GHz band.
10. An electronic device, characterized in that it comprises a low SAR dual-frequency antenna according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122051568.4U CN216120763U (en) | 2021-08-27 | 2021-08-27 | Low-SAR dual-frequency antenna and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122051568.4U CN216120763U (en) | 2021-08-27 | 2021-08-27 | Low-SAR dual-frequency antenna and electronic equipment |
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| CN216120763U true CN216120763U (en) | 2022-03-22 |
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| CN202122051568.4U Active CN216120763U (en) | 2021-08-27 | 2021-08-27 | Low-SAR dual-frequency antenna and electronic equipment |
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