CN211605411U - Structure for improving isolation degree between antennas of intelligent terminal - Google Patents
Structure for improving isolation degree between antennas of intelligent terminal Download PDFInfo
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- CN211605411U CN211605411U CN202020454514.5U CN202020454514U CN211605411U CN 211605411 U CN211605411 U CN 211605411U CN 202020454514 U CN202020454514 U CN 202020454514U CN 211605411 U CN211605411 U CN 211605411U
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- conductive cloth
- coaxial line
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Abstract
The utility model discloses a structure for improving the isolation between intelligent terminal antennas, which comprises a first antenna arranged on the main board of the intelligent terminal, a second antenna arranged on the inner side of the shell of the intelligent terminal, a coaxial line and a conductive cloth; the second antenna is electrically connected with the mainboard through a coaxial line, and the conductive cloth covers the outer side of the coaxial line between the first antenna and the second antenna; the conductive cloth is used for cutting off high-frequency current flowing through the coaxial line so as to improve the isolation between the first antenna and the second antenna. The utility model discloses cover a conductive cloth in the coaxial line outside between two antennas, and then cut through the high frequency current of conductive cloth with the coaxial line of flowing through to this isolation that improves between first antenna and the second antenna, thereby realize reducing the purpose of the mutual interference between two antennas, reasonable in design, compact structure, simple to operate, with low costs, practicality are strong.
Description
Technical Field
The utility model relates to an antenna technology field especially relates to an improve structure of isolation between intelligent terminal antenna.
Background
With the high-speed development of the internet, the smart home industry is gradually emerging. The intelligent home is characterized in that various intelligent devices (such as intelligent sound equipment, intelligent air conditioners and the like) in the home are connected together through WIFI and Bluetooth technologies, and the intelligent devices can be remotely controlled to work through the Internet, so that interaction between people and the intelligent devices is realized.
The intelligent device generally adopts a WIFI antenna and a Bluetooth antenna to transmit and receive signals, but the service frequencies of the WIFI antenna and the Bluetooth antenna are both 2.4 GHz-2.5 GHz. Therefore, co-channel interference easily exists between the two antennas; the strength of mutual interference of the two antennas is related to the isolation between the two antennas, and the better the isolation is, the smaller the mutual interference between the antennas is; in the industry, the isolation between the antennas is improved by basically increasing the installation distance of the two antennas; however, this method is limited by the installation environment of the intelligent terminal and the size of the intelligent terminal, and is inconvenient to implement and install. Therefore, a structure for improving the isolation between the antennas without increasing the distance between the two antennas as much as possible is urgently required.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an improve structure of isolation between intelligent terminal antenna, this structure covers a conductive cloth in the coaxial line outside between two antennas, and then cuts the high frequency current of the coaxial line of will flowing through conductive cloth to this improves the isolation between first antenna and the second antenna, thereby realizes reducing the purpose of mutual interference between two antennas, reasonable in design, compact structure, simple to operate, with low costs, practicality are strong.
In order to realize the purpose, the following technical scheme is adopted:
a structure for improving isolation between antennas of an intelligent terminal comprises a first antenna arranged on a main board of the intelligent terminal, a second antenna arranged on the inner side of a shell of the intelligent terminal, a coaxial line and conductive cloth; the second antenna is electrically connected with the mainboard through a coaxial line, and the conductive cloth covers the outer side of the coaxial line between the first antenna and the second antenna; the conductive cloth is used for cutting off high-frequency current flowing through the coaxial line so as to improve the isolation between the first antenna and the second antenna.
Further, the length of the coaxial line is greater than 1/2 of the lowest same-frequency-band wavelength used by the first antenna and the second antenna.
Further, the distance between the conductive cloth and the second antenna is 1/2 of the lowest same-frequency band wavelength used by the first antenna and the second antenna.
Further, the length of the conductive cloth is 1/4 of the lowest same frequency band wavelength used by the first antenna and the second antenna, and the width of the conductive cloth is 10-20 mm.
Further, the first antenna is a bluetooth antenna, and the second antenna is a WIFI antenna.
Adopt above-mentioned scheme, the beneficial effects of the utility model are that:
through cover electrically conductive cloth at coaxial line certain distance department apart from the second antenna, and then cut the high frequency current of the coaxial line of will flowing through electrically conductive cloth to this isolation that improves between first antenna and the second antenna, thereby realize reducing the purpose of mutual interference between two antennas, reasonable in design, compact structure, simple to operate, with low costs, practicality are strong.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a waveform diagram of the isolation between the two antennas at 2.4 GHz-2.5 GHz without the conductive cloth;
FIG. 3 is a waveform diagram of the isolation between the two antennas at 2.4 GHz-2.5 GHz when the conductive cloth is adhered in one embodiment;
wherein the figures identify the description:
1-a main board; 2 — a first antenna;
3-a second antenna; 4-coaxial line;
5, conductive cloth.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the utility model provides a structure for improving isolation between intelligent terminal antennas, which comprises a first antenna 2 arranged on an intelligent terminal mainboard 1, a second antenna 3 arranged on the inner side of an intelligent terminal shell, a coaxial line 4 and a conductive cloth 5; the second antenna 3 is electrically connected with the mainboard 1 through a coaxial line 4, and the conductive cloth 5 covers the outer side of the coaxial line 4 between the first antenna 2 and the second antenna 3; the conductive cloth 5 is used for cutting off the high-frequency current flowing through the coaxial line 4 so as to improve the isolation between the first antenna 2 and the second antenna 3; the length of the coaxial line 4 is greater than 1/2 of the lowest same-frequency-band wavelength used by the first antenna 2 and the second antenna 3; the distance between the conductive cloth 5 and the second antenna 3 is 1/2 of the lowest same-frequency-band wavelength used by the first antenna 2 and the second antenna 3; the length of the conductive cloth 5 is 1/4 of the lowest same-frequency-band wavelength used by the first antenna 2 and the second antenna 3, and the width of the conductive cloth is 10-20 mm; first antenna 2 is the bluetooth antenna, and second antenna 3 is the WIFI antenna.
In this embodiment, the first antenna 2 is a bluetooth antenna (onboard antenna) and is directly installed on the main board 1 of the intelligent terminal; the second antenna 3 is a WIFI antenna (FPC antenna) and is installed on the inner side of the shell of the intelligent terminal (the installation position can be adjusted timely according to the actual installation environment of the intelligent terminal); the WIFI antenna is electrically connected with the mainboard 1 through the coaxial line 4.
Because the frequency of use of bluetooth antenna and WIFI antenna is 2.4GHz ~ 2.5GHz, and the wavelength of 2.4GHz frequency channel is 125mm, so the wavelength of bluetooth antenna and WIFI antenna minimum same frequency channel is 125mm, as shown in fig. 1, paste electrically conductive cloth 5 at coaxial line 4 apart from WIFI antenna 62.5mm (i.e. 1/2 department of 2.4GHz frequency channel wavelength), electrically conductive cloth 5 length is 31.25mm (i.e. 1/4 of 2.4GHz frequency channel wavelength), the width is 10 ~ 20mm (preferably 15mm), and then cut off the high frequency current that flows through coaxial line 4 shielding layer crust through electrically conductive cloth 5, improve the isolation between WIFI antenna and the bluetooth antenna with this, reach the purpose of reducing the mutual interference between two days, specifically:
the WIFI antenna is a dipole antenna, the dipole antenna belongs to a balanced antenna, the coaxial line 4 belongs to an unbalanced transmission line, and if the WIFI antenna and the balanced antenna are directly connected, high-frequency current flows through the outer skin of the coaxial line 4, so that radiation of the WIFI antenna is influenced, and the isolation between the WIFI antenna and the Bluetooth antenna is also poor. The conductive cloth 5 covering the outer side of the coaxial line 4 plays a role of a balun balancer (namely, a balun), and can cut off high-frequency current flowing through the shielding layer sheath of the coaxial line 4, so that the isolation between the WIFI antenna and the Bluetooth antenna is improved, and the purpose of reducing mutual interference between the WIFI antenna and the Bluetooth antenna is achieved.
Continuing to refer to fig. 2-3, which are waveform diagrams of the isolation between the antennas in the 2.4GHz to 2.5GHz band before the conductive cloth 5 is attached and after the conductive cloth 5 is attached, respectively, it can be seen from the diagrams:
1) when the conductive cloth 5 is not pasted, the isolation between the antennas is-24.3 dB at the frequency band of 2.4GHz, and after the conductive cloth 5 is pasted, the isolation at the frequency band of 2.4GHz is-41.5 dB, which is improved by 17.2 dB;
2) when the conductive cloth 5 is not pasted, the isolation between the antennas is-24.7 dB at the frequency band of 2.5GHz, and after the conductive cloth 5 is pasted, the isolation at the frequency band of 2.5GHz is-33.2 dB, which is improved by 8.5 dB.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A structure for improving the isolation between antennas of an intelligent terminal comprises a first antenna arranged on a main board of the intelligent terminal, a second antenna arranged on the inner side of a shell of the intelligent terminal, and is characterized by also comprising a coaxial line and conductive cloth; the second antenna is electrically connected with the mainboard through a coaxial line, and the conductive cloth covers the outer side of the coaxial line between the first antenna and the second antenna; the conductive cloth is used for cutting off high-frequency current flowing through the coaxial line so as to improve the isolation between the first antenna and the second antenna.
2. The structure for improving the isolation degree between the antennas of the intelligent terminal according to claim 1, wherein the length of the coaxial line is greater than 1/2 of the lowest common-frequency band wavelength used by the first antenna and the second antenna.
3. The structure for improving the isolation degree between the antennas of the intelligent terminal according to claim 2, wherein the distance between the conductive cloth and the second antenna is 1/2 of the wavelength of the lowest same frequency band used by the first antenna and the second antenna.
4. The structure for improving the isolation degree between the antennas of the intelligent terminal according to claim 3, wherein the length of the conductive cloth is 1/4 of the lowest same frequency band wavelength used by the first antenna and the second antenna, and the width of the conductive cloth is 10-20 mm.
5. The structure for improving the isolation degree between the antennas of the intelligent terminal according to claim 4, wherein the first antenna is a Bluetooth antenna, and the second antenna is a WIFI antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020454514.5U CN211605411U (en) | 2020-03-31 | 2020-03-31 | Structure for improving isolation degree between antennas of intelligent terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020454514.5U CN211605411U (en) | 2020-03-31 | 2020-03-31 | Structure for improving isolation degree between antennas of intelligent terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211605411U true CN211605411U (en) | 2020-09-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020454514.5U Active CN211605411U (en) | 2020-03-31 | 2020-03-31 | Structure for improving isolation degree between antennas of intelligent terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211605411U (en) |
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2020
- 2020-03-31 CN CN202020454514.5U patent/CN211605411U/en active Active
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