CN215498729U - Radio frequency communication isolation circuit, communication equipment and communication system - Google Patents
Radio frequency communication isolation circuit, communication equipment and communication system Download PDFInfo
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- CN215498729U CN215498729U CN202121381135.9U CN202121381135U CN215498729U CN 215498729 U CN215498729 U CN 215498729U CN 202121381135 U CN202121381135 U CN 202121381135U CN 215498729 U CN215498729 U CN 215498729U
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Abstract
The utility model relates to the technical field of communication, and provides a radio frequency communication isolation circuit, communication equipment and a communication system, wherein the circuit comprises: the device comprises a first isolation unit, a second isolation unit and a filtering unit; the first isolation unit is connected between a power supply end of the radio frequency communication device and an output end of the power supply device; the second isolation unit is connected between the grounding end of the radio frequency communication device and the grounding end of the power supply device; the filtering unit is connected between the first end of the first isolation unit and the first end of the second isolation unit. The utility model utilizes the filtering unit to generate a frequency channel, simultaneously utilizes the first isolation unit and the second isolation unit to effectively reduce crosstalk at two ends, and adds the crosstalk into communication equipment, thereby effectively reducing crosstalk between a radio frequency communication device and a power supply device and improving the EMI performance and the radiation performance of the communication equipment.
Description
Technical Field
The utility model belongs to the technical field of communication, and particularly relates to a radio frequency communication isolation circuit, communication equipment and a communication system.
Background
Radio frequency means that carrier power with a certain frequency can be emitted through an antenna, and is transmitted in a free space in the form of an alternating electromagnetic field at the speed of light, the transmission rate is changed when the carrier power touches different media, electromagnetic wave reflection, refraction, diffraction, penetration and the like can also be generated, various losses are caused, and the skin effect phenomenon is generated when metal wires are transmitted. The radio frequency has the advantages of non-directivity, high response speed, bidirectional transmission, large transmission data volume and the like, and is widely applied to the technical field of communication.
In the prior art, a radio frequency communication device is generally powered by a single alternating current power supply, and since an isolation circuit is not arranged between the two, signal crosstalk is generated between the two, which seriously affects the EMI (Electromagnetic Interference) performance and the radiation performance of communication equipment.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present invention provide a radio frequency communication isolation circuit, a communication device, and a communication system, so as to solve the problem that signal crosstalk is generated between a radio frequency communication device and a power supply device in the prior art, which affects EMI performance and radiation performance of the communication device.
A first aspect of an embodiment of the present invention provides a radio frequency communication isolation circuit, including: the device comprises a first isolation unit, a second isolation unit and a filtering unit;
the first end of the first isolation unit is used for being connected with a power supply end of the radio frequency communication device, and the second end of the first isolation unit is used for being connected with an output end of the power supply device;
the first end of the second isolation unit is used for being connected with the grounding end of the radio frequency communication device, and the second end of the second isolation unit is used for being connected with the grounding end of the power supply device;
and the first end of the filtering unit is connected with the first end of the first isolation unit, and the second end of the filtering unit is connected with the first end of the second isolation unit.
Optionally, the first isolation unit includes: a first inductor;
and the first end of the first inductor is connected with the first end of the first isolation unit, and the second end of the first inductor is connected with the second end of the first isolation unit.
Optionally, the first inductor is an energy storage inductor.
Optionally, the second isolation unit includes: a second inductor;
and the first end of the second inductor is connected with the first end of the second isolation unit, and the second end of the second inductor is connected with the second end of the second isolation unit.
Optionally, the filtering unit includes: a capacitor;
and the first end of the capacitor is connected with the first end of the filtering unit, and the second end of the capacitor is connected with the second end of the filtering unit.
Optionally, the capacitor is a chip ceramic capacitor.
A second aspect of an embodiment of the present invention provides a communication device, including: a power supply device, a radio frequency communication device and any one of the radio frequency communication isolation circuits as provided in the first aspect of the embodiments of the present invention.
A third aspect of the embodiments of the present invention provides a communication system including the communication device provided in the second aspect of the embodiments of the present invention.
The embodiment of the utility model provides a radio frequency communication isolation circuit, which comprises: the device comprises a first isolation unit, a second isolation unit and a filtering unit; the first end of the first isolation unit is used for being connected with a power supply end of the radio frequency communication device, and the second end of the first isolation unit is used for being connected with an output end of the power supply device; the first end of the second isolation unit is used for being connected with the grounding end of the radio frequency communication device, and the second end of the second isolation unit is used for being connected with the grounding end of the power supply device; and the first end of the filtering unit is connected with the first end of the first isolation unit, and the second end of the filtering unit is connected with the first end of the second isolation unit. The embodiment of the utility model utilizes the filtering unit to generate a frequency channel, simultaneously utilizes the first isolation unit and the second isolation unit to effectively reduce crosstalk at two ends, and adds the crosstalk into communication equipment, thereby effectively reducing crosstalk between a radio frequency communication device and a power supply device and improving the EMI performance and the radiation performance of the communication equipment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of an rf communication isolation circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an rf communication isolation circuit according to an embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram of an inductor;
FIG. 4 is a graph of the frequency impedance characteristic of an inductor;
FIG. 5 is an equivalent circuit diagram of a capacitor;
fig. 6 is a graph of the frequency impedance characteristic of the capacitor.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the utility model. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The radio frequency means that carrier power of the frequency can be emitted through an antenna, and is transmitted in a free space in the form of an alternating electromagnetic field at the speed of light, the transmission rate is changed when the carrier power touches different media, electromagnetic wave reflection, refraction, diffraction, penetration and the like can also occur, various losses are caused, and the skin effect phenomenon is caused when metal wires are transmitted. The radio frequency has the advantages of non-directivity, high response speed, bidirectional transmission, large data transmission quantity and the like, and is widely applied to various technical fields. The radio frequency communication means in a communication device are usually powered by an alternating current power supply, i.e. power supply means. The ground network of the power supply device is in a wiring shape, the radio frequency communication device usually needs to be paved in a large area to increase radiation performance, and the wiring modes of the power supply device and the radio frequency communication device are different. The power supply network and the ground network of the radio frequency communication device are easily affected by the routing mode of the power supply network of the power supply device, so that the radiation power difference and the radiation receiving Sensitivity difference of the radio frequency communication device, namely, the Total Radiated Power (TRP) difference and the Total Isotropic Sensitivity (TIS) do not reach the standard, and the communication distance and the communication quality of the whole communication equipment are affected. Meanwhile, signals of the radio frequency communication device are interfered to the power supply device through the ground wire, so that signal interference is caused, some unnecessary interference is generated, and the EMI performance and the radiation performance of the communication equipment are seriously influenced.
In view of the above problem, referring to fig. 1, an embodiment of the present invention provides a radio frequency communication isolation circuit, including: a first isolation unit 11, a second isolation unit 12 and a filtering unit 13;
a first isolation unit 11, having a first end for connecting with a power supply terminal VCC2 of the radio frequency communication device 15, and a second end for connecting with an output terminal VCC1 of the power supply device 14;
a second isolation unit 12, having a first end for connecting to the ground GND2 of the rf communication device 15 and a second end for connecting to the ground GND1 of the power supply device 14;
and a first end of the filtering unit 13 is connected with the first end of the first isolation unit 11, and a second end of the filtering unit is connected with the first end of the second isolation unit 12.
In the embodiment of the present invention, a frequency path is formed between the power supply terminal VCC2 and the ground terminal GND2 of the radio frequency communication device 15 through the filtering unit 13, so that the signal of the power supply terminal VCC2 of the radio frequency communication device 15 is transmitted to the ground network of the radio frequency communication device 15 through the ground terminal GND2 with the shortest path and the smallest loss, thereby greatly reducing the amplitude of the signal of the radio frequency communication device 15 on the power supply device 14 and reducing the crosstalk of the radio frequency communication device 15 to the power supply device 14. Furthermore, according to the scheme, frequency paths are respectively formed between the power supply terminal VCC1 of the power supply device 14 and the power supply terminal VCC2 of the radio frequency communication device 15 and between the ground terminal GND1 of the power supply device 14 and the ground terminal GND2 of the radio frequency communication device 15 through the first isolation unit 11 and the second isolation unit 12, and the frequency paths present a high-impedance state to the resonance of the radio frequency communication isolation circuit, so that signals with the same frequency as the resonance frequency of the circuit can be effectively isolated or attenuated, the influence of the radio frequency communication device 15 on the power supply device 14 is further reduced, meanwhile, the influence of the power supply device 14 on the power supply network and the ground network of the radio frequency communication device 15 is also reduced, the crosstalk between the power supply device and the ground network is reduced, the radiation efficiency of the antenna is improved, and the TRP, TIS, EMI performance and the radiation performance of the communication equipment are improved.
In some embodiments, referring to fig. 2, the first isolation unit 11 may include: a first inductance L1;
and a first inductor L1, having a first terminal connected to the first terminal of the first isolation unit 11, and a second terminal connected to the second terminal of the first isolation unit 11.
In some embodiments, the first inductor L1 may be an energy storage type inductor.
In some embodiments, referring to fig. 2, the second isolation unit 12 may include: a second inductance L2;
and a second inductor L2, having a first terminal connected to the first terminal of the second isolation unit 12 and a second terminal connected to the second terminal of the second isolation unit 12.
In some embodiments, the second inductor L2 may also be an energy storage type inductor.
An Inductor (Inductor) is a component that can convert electrical energy into magnetic energy for storage. The inductance only hinders the change of the current. If the inductor is in a state where no current is passing, it will try to block the current from flowing through it when the circuit is closed; if the inductor is in a state of passing current, the inductor will try to keep the current unchanged when the circuit is disconnected. In radio frequency communication, an inductor formed by winding a wire has a certain inductance, an equivalent resistance exists on the wire, a parasitic capacitance exists between a circle of wires, an equivalent circuit of the inductor is shown in fig. 3, L is self-inherent inductance, and R isLIs a series resistance, CLA parasitic bypass capacitance. Referring to fig. 4, the inductance decreases as the frequency increases, resonates at a self-resonant frequency, and shows a capacitive characteristic beyond the self-resonant frequency, and the self-resonant frequency is lower as the inductance is larger in the same type of inductance.
According to the frequency characteristic of the inductor, the first isolation unit 11 and the second isolation unit 12 are formed by the inductor, and a frequency path is formed between the power supply device 14 and the radio frequency communication device 15, so that crosstalk between the power supply device and the radio frequency communication device is prevented, and the circuit is simple in structure and good in effect.
In some embodiments, referring to fig. 2, the filtering unit 13 may include: a capacitance C1;
and a capacitor C1 having a first terminal connected to the first terminal of the filter unit 13 and a second terminal connected to the second terminal of the filter unit 13.
Two conductors close to each other with a non-conductive insulating medium in between, thus forming a capacitor. When a voltage is applied between the two plates of the capacitor, the capacitor stores charge. A capacitor is a component that stores electricity and electric energy (potential energy). Precisely one capacitor not only exhibits a capacitive behavior but also its own inductive, resistive behavior, fig. 5 shows the equivalent circuit of the capacitor, RCEquivalent resistance for dielectric loss, LnTo distribute inductance, RnC is the insulation resistance and the intrinsic capacitance itself. Referring to fig. 6, as with the inductor, the capacitance of the capacitor changes with increasing frequency, and resonance occurs at a frequency above which the capacitor exhibits an inductive characteristic. The internal inductance of the capacitor with a large capacitance value is also large.
According to the self-resonant frequency characteristic of the capacitor, the filter unit 13 is formed by the capacitor C1, and a frequency path is formed between the power supply terminal VCC2 and the ground terminal GND2 of the radio frequency communication device 15, so that the signal of the radio frequency device is prevented from influencing the power supply device 14, and the circuit has a simple structure and a good effect.
In some embodiments, the capacitor C1 may be a chip ceramic capacitor.
Referring to fig. 2, in the embodiment of the present invention, by using the SRF (Self-Resonant Frequency) characteristics of the inductor and the capacitor, the inductor is in a high-resistance state and the capacitor is in a low-loss state under a high-Frequency signal, so as to form an isolation circuit, thereby effectively avoiding crosstalk between the inductor and the capacitor and improving the performance of the communication device.
Corresponding to any one of the radio frequency communication isolation circuits, an embodiment of the present invention further provides a communication device, including: the power supply device, the radio frequency communication device and any one of the radio frequency communication isolation circuits have the advantages of the radio frequency communication isolation circuit, and are not described herein again.
Further, an embodiment of the present invention further provides a communication system, which includes the communication device provided in the foregoing embodiment, and has advantages of the communication device, which are not described herein again.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A radio frequency communication isolation circuit, comprising: the device comprises a first isolation unit, a second isolation unit and a filtering unit;
the first end of the first isolation unit is used for being connected with a power supply end of the radio frequency communication device, and the second end of the first isolation unit is used for being connected with an output end of the power supply device;
the first end of the second isolation unit is used for being connected with the grounding end of the radio frequency communication device, and the second end of the second isolation unit is used for being connected with the grounding end of the power supply device;
and the first end of the filtering unit is connected with the first end of the first isolation unit, and the second end of the filtering unit is connected with the first end of the second isolation unit.
2. The radio frequency communication isolation circuit of claim 1, wherein the first isolation unit comprises: a first inductor;
and a first end of the first inductor is connected with a first end of the first isolation unit, and a second end of the first inductor is connected with a second end of the first isolation unit.
3. The radio frequency communication isolation circuit of claim 2, wherein the first inductor is a tank inductor.
4. The radio frequency communication isolation circuit of claim 1, wherein the second isolation unit comprises: a second inductor;
and the first end of the second inductor is connected with the first end of the second isolation unit, and the second end of the second inductor is connected with the second end of the second isolation unit.
5. The radio frequency communication isolation circuit of claim 1, wherein the filtering unit comprises: a capacitor;
and the first end of the capacitor is connected with the first end of the filtering unit, and the second end of the capacitor is connected with the second end of the filtering unit.
6. The radio frequency communication isolation circuit of claim 5, wherein the capacitor is a chip ceramic capacitor.
7. A communication device, comprising: power supply means, radio frequency communication means and a radio frequency communication isolation circuit as claimed in any one of claims 1 to 6.
8. A communication system comprising the communication device of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121381135.9U CN215498729U (en) | 2021-06-21 | 2021-06-21 | Radio frequency communication isolation circuit, communication equipment and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121381135.9U CN215498729U (en) | 2021-06-21 | 2021-06-21 | Radio frequency communication isolation circuit, communication equipment and communication system |
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| Publication Number | Publication Date |
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| CN215498729U true CN215498729U (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121381135.9U Active CN215498729U (en) | 2021-06-21 | 2021-06-21 | Radio frequency communication isolation circuit, communication equipment and communication system |
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| CN (1) | CN215498729U (en) |
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- 2021-06-21 CN CN202121381135.9U patent/CN215498729U/en active Active
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