CN210629480U - Wireless communication system working in ISM frequency band - Google Patents
Wireless communication system working in ISM frequency band Download PDFInfo
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- CN210629480U CN210629480U CN201922311133.1U CN201922311133U CN210629480U CN 210629480 U CN210629480 U CN 210629480U CN 201922311133 U CN201922311133 U CN 201922311133U CN 210629480 U CN210629480 U CN 210629480U
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Abstract
The utility model discloses a wireless communication system working in ISM frequency band, belonging to the technical field of microwave communication, the system comprises a control module, a power amplifier module, a first radio frequency signal transceiver module and a second radio frequency signal transceiver module; the first radio frequency signal transceiver module and the second radio frequency signal transceiver module are connected with the control module in a bidirectional mode, and the power amplifier module is connected with the output end of the second radio frequency signal transceiver module. The utility model is used for realize the communication of 866MHz frequency channel in the ISM frequency channel, can satisfy present microwave communication system's demand.
Description
Technical Field
The utility model relates to a microwave communication technical field especially relates to a wireless communication system of work in ISM frequency channel.
Background
Industrial, Scientific and Medical (ISM) bands are Radio-frequency bands defined by the international telecommunication Union Radio-communication Sector (ITU-R), reserved by countries around the world, for applications in industry, Scientific research and microwave medicine. The microwave communication antenna can be used without license or cost as long as certain transmitting power is observed and other frequency bands are not interfered, and is an important frequency band for microwave communication. The ISM frequency band in China has 433MHz, 866MHz, 915MHz, 2.4G and other bands, and the frequency band is generally used in civil common wireless communication, and the application range of the frequency band is more and more extensive.
With the development of communication technology, more and more products using the ISM band permeate the aspects of life. In microwave communication system, can not send wireless signal with too high transmitting power, the restriction can be received to signal coverage this moment, on this basis, the utility model provides a wireless communication system of work in the ISM frequency channel, its low power transmitting power, high power transmission output can satisfy present microwave communication system's demand.
SUMMERY OF THE UTILITY MODEL
The utility model provides a work is at the wireless communication system of ISM frequency channel, its low-power transmitting power, high power transmission output can satisfy present microwave communication system's demand, can realize the communication of 866 frequency channel in the whole ISM frequency channel.
The purpose of the utility model is realized through the following technical scheme: a wireless communication system working in ISM frequency band specifically comprises a control module, a power amplifier module, a first radio frequency signal transceiver module and a second radio frequency signal transceiver module; the first radio frequency signal transceiving module and the second radio frequency signal transceiving module are in bidirectional connection with the control module; the power amplifier module is connected with the output end of the second radio frequency signal transceiving module.
Specifically, the radio frequency signal input/output end of the second radio frequency signal transceiver module is connected to the second SMA interface, and is configured to receive a radio frequency signal in a transceiver channel (receiving channel); and the radio frequency signal output end of the power amplifier module is connected to the third SMA interface so as to realize the transmission of the radio frequency signal.
Specifically, the system further comprises a power module and a battery module, wherein the voltage output end of the battery module is connected with the power module, and the voltage output end of the power module is connected with the control module and the power amplifier module.
Specifically, the power amplifier module includes a plurality of attenuators and amplifiers to realize amplification of the radio frequency signal.
Specifically, the power amplifier module comprises a first attenuator, a first amplifier, a second attenuator and a second amplifier which are connected in sequence, wherein the attenuator is specifically a pi-type attenuator.
Specifically, the power amplifier module further comprises an isolator, and the isolator is connected with the output end of the second amplifier and used for preventing the amplifier from being burnt out.
Specifically, the communication frequency of the radio frequency signal transceiver module includes three frequency bands of 433MHz, 866MHz, and 915MHz in the ISM.
Specifically, an EMI chip is further disposed between the control module and the radio frequency signal transceiver module, and is used for realizing signal isolation.
Specifically, the control module is provided with an internal power circuit, and the internal power circuit is connected with the output end of the battery module. The internal power circuit comprises a voltage conversion module and a plurality of LDO voltage stabilization modules, wherein the output end of the voltage conversion module is connected with the LDO voltage stabilization modules to output 3.3V direct-current voltage to supply power for the first radio-frequency signal transceiver module and the second radio-frequency signal transceiver module.
Compared with the prior art, the utility model discloses beneficial effect is:
the utility model discloses wireless communication system includes control module, power amplifier module, first radio frequency signal transceiver module and second radio frequency signal transceiver module, and second radio frequency signal transceiver module receives the radio frequency signal of receiving and dispatching passageway and transmits to control module, and control module exports received signal transmission to first radio frequency signal transceiver module behind power amplifier module adjusting signal's transmitting power, accomplishes the communication of 866MHz frequency channel in the ISM frequency channel.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the figure:
fig. 1 is a system block diagram of embodiment 1 of the present invention;
fig. 2 is an external view of the system of embodiment 1 of the present invention;
fig. 3 is a block diagram of a power amplifier module according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of the rf signal transceiver module according to embodiment 1 of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are the directions or positional relationships indicated on the basis of the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1, in embodiment 1, a wireless communication system operating in an ISM frequency band specifically includes a control module, a power amplifier module, a first radio frequency signal transceiver module, a second radio frequency signal transceiver module, a power module, and a battery module; the first radio frequency signal transceiver module and the second radio frequency signal transceiver module are connected with the control module in a bidirectional mode, and the power amplifier module is connected with the output end of the second radio frequency signal transceiver module.
Further, as shown in fig. 2, the system of the present invention uses the structural form of the circuit board installed inside the cavity, and is provided with 2 SMA-K type radio frequency connectors and 1J 30J-15ZKP power/communication interface. The inside circuit board flip-chip of system can effectively protect the rainwater and get into the inside damage work circuit of product, and the system is equipped with 6M 3's installation ear, guarantees that the product is reliable fixed.
Further, the control module adopts an ARM architecture, specifically, the inner core of the microcontroller STM32F107 is 32-bit Cortex-M3, and the working frequency of the control module can reach 72MHz and 1.25 DMIPS/MHz. In order to improve the isolation between the radio frequency signal transceiver modules, an interface between the control module and the radio frequency transceiver modules is isolated by using an EMI (electro magnetic interference) chip, and an internal power circuit is separately arranged to supply power to the radio frequency transceiver modules. EMI chips are particularly 2 pai-pi 120, have-35 dB of suppression near 800MHz, and can effectively improve the isolation between 2 radio frequency signal transceiver modules. The internal power circuit is connected with the output end of the battery module, specifically, the control module is provided with an XS 1J 30J-15ZKP power supply/communication interface which is interconnected through an RS422 data line, and the XS 1J 30J-15ZKP power supply/communication interface is connected with the battery module through the RS422 data line so as to realize the switching control of direct-current voltage. The internal power circuit comprises a voltage conversion module and a plurality of LDO voltage stabilization modules, wherein the output end of the voltage conversion module is connected with the LDO voltage stabilization modules to output 3.3V direct-current voltage to supply power for the first radio-frequency signal transceiver module and the second radio-frequency signal transceiver module. The voltage conversion module is a voltage conversion module LM2596, and the LDO voltage stabilization module is an LDO voltage stabilization module AMS 1117.
Furthermore, the power amplifier module is used for adjusting the transmission power of the transmission signal, and the signal output end is connected to the third SMA interface (XS3 SMA) to realize the transmission of the radio frequency signal. As shown in fig. 3, the attenuator specifically includes a first attenuator, a first amplifier, a second attenuator, a second amplifier, and an isolator, which are connected in sequence, where the attenuator specifically is a pi-type attenuator. The two-stage amplifier completes the power amplification effect on the radio frequency signal, the pi-type attenuator mainly plays the roles of improving the input standing wave of the radio frequency signal and optimizing the cascade matching, and the isolator is used for improving the output standing wave and preventing the amplifier from being burnt out due to overlarge open-circuit reflection echo. The working voltage of the amplifier is 28V, the grid voltage is 2.7V, the quiescent current is 122mA at the moment, and the quiescent power consumption of the amplifier in the quiescent operating state is 3.412W. The index parameters of the power amplifier module are shown in table 1, the signal output power is more than or equal to 35dBm, and the requirements of the existing microwave communication system can be met.
TABLE 1 index parameters of Power Amplifier Module
Further, the rf signal transceiver module includes a first rf signal transceiver module and a second rf signal transceiver module, and the second rf signal transceiver module is connected to the second SMA interface (XS2 SMA) through the RS422 data line, and is configured to receive the rf signal in the transceiver channel (receive channel). Radio frequency signal transceiver module communication frequency includes in the ISM 433MHz, 866MHz, the three frequency channel of 915MHz the utility model is used for realize the communication of 866 frequency channel in the ISM frequency channel. The radio frequency signal transceiver module adopted in the embodiment adopts a wireless communication chip which is a low-power consumption wireless communication chip integrating local oscillation, channel, modulation and demodulation, data management and the like, the transmitting power of the radio frequency signal transceiver module can reach 10dBm at most, the receiving sensitivity can reach-100 dBm, and the modulation mode is GFSK. More specifically, the rf transceiver module has an operating voltage of 3.3V, and the circuit principle thereof is shown in fig. 4.
Furthermore, the battery module is used for outputting 28V direct current voltage to supply power to the power supply module, the working temperature of the battery module is-40-60 ℃, the battery capacity is 81WH under the condition of 25 ℃ discharging, and the battery discharging capacity is not lower than 70 percent of the nominal value, namely 56WH, during low-temperature working, so that the use requirement of the project is met. Furthermore, the voltage output end of the power supply module is connected with the control module and the power amplification module, and after the 28V power supply input by the battery module is stabilized, 24V direct current voltage is output to supply power for the control module and the power amplification module.
Further, the utility model discloses the technical indicator of system is as shown in table 2, and the working signal frequency channel is 860MHz ~ 870MHz, accomplishes the communication of 866MHz frequency channel in the ISM frequency channel.
TABLE 2 technical indices of the System
The utility model discloses wireless communication system includes control module, power amplifier module, first radio frequency signal transceiver module and second radio frequency signal transceiver module, and second radio frequency signal transceiver module receives the radio frequency signal of receiving and dispatching passageway and transmits to control module, and control module exports received signal transmission to first radio frequency signal transceiver module behind power amplifier module adjusting signal's transmitting power, accomplishes the communication of 866MHz frequency channel in the ISM frequency channel. And the low-power emission power output of the system is more than or equal to 5dBm, and the high-power emission power output is more than or equal to +/-35 dBm, so that the requirements of the current microwave communication system can be met.
The above detailed description is the detailed description of the present invention, and it can not be considered that the detailed description of the present invention is limited to these descriptions, and to the ordinary skilled person in the art to which the present invention belongs, without departing from the concept of the present invention, a plurality of simple deductions and replacements can be made, which should be regarded as belonging to the protection scope of the present invention.
Claims (10)
1. A wireless communication system operating in an ISM band, characterized by: the system comprises a control module, a power amplifier module, a first radio frequency signal transceiver module and a second radio frequency signal transceiver module; the first radio frequency signal transceiver module and the second radio frequency signal transceiver module are connected with the control module in a bidirectional mode, and the power amplifier module is connected with the output end of the second radio frequency signal transceiver module.
2. A wireless communication system according to claim 1, wherein: and the input and output ends of the second radio frequency signal transceiver module are connected to the second SMA interface, and the output end of the power amplifier module is connected to the third SMA interface.
3. A wireless communication system according to claim 1, wherein: the system further comprises a power supply module and a battery module, wherein the voltage output end of the battery module is connected with the power supply module, and the voltage output end of the power supply module is connected with the control module and the power amplifier module.
4. A wireless communication system according to claim 1, wherein: the power amplification module comprises a plurality of attenuators and amplifiers to realize amplification of radio frequency signals.
5. A wireless communication system according to claim 4, wherein: the power amplifier module comprises a first attenuator, a first amplifier, a second attenuator and a second amplifier which are sequentially connected, wherein the attenuator is a pi-type attenuator.
6. A wireless communication system according to claim 4, wherein: the power amplifier module further comprises an isolator, and the isolator is connected with the output end of the second amplifier.
7. A wireless communication system according to claim 1, wherein: the communication frequency of the radio frequency signal transceiver module comprises 433MHz, 866MHz and 915MHz frequency bands in ISM.
8. A wireless communication system according to claim 1, wherein: an EMI chip is arranged between the control module and the radio frequency signal transceiving module.
9. A wireless communication system according to claim 2, wherein: the control module is provided with an internal power supply circuit, and the internal power supply circuit is connected with the output end of the battery module.
10. A wireless communication system according to claim 9, wherein: the internal power circuit comprises a voltage conversion module and a plurality of LDO voltage stabilization modules, wherein the output end of the voltage conversion module is connected with the LDO voltage stabilization modules to output 3.3V direct-current voltage to supply power for the first radio-frequency signal transceiver module and the second radio-frequency signal transceiver module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922311133.1U CN210629480U (en) | 2019-12-20 | 2019-12-20 | Wireless communication system working in ISM frequency band |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922311133.1U CN210629480U (en) | 2019-12-20 | 2019-12-20 | Wireless communication system working in ISM frequency band |
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| Publication Number | Publication Date |
|---|---|
| CN210629480U true CN210629480U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922311133.1U Active CN210629480U (en) | 2019-12-20 | 2019-12-20 | Wireless communication system working in ISM frequency band |
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| CN (1) | CN210629480U (en) |
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