CN211656142U - L-shaped radio frequency matching circuit of zigbee intelligent household wireless module based on EFR32 - Google Patents
L-shaped radio frequency matching circuit of zigbee intelligent household wireless module based on EFR32 Download PDFInfo
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- CN211656142U CN211656142U CN202020541776.5U CN202020541776U CN211656142U CN 211656142 U CN211656142 U CN 211656142U CN 202020541776 U CN202020541776 U CN 202020541776U CN 211656142 U CN211656142 U CN 211656142U
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Abstract
The embodiment of the utility model discloses L type radio frequency matching circuit of zigbee intelligence house wireless module based on EFR32, this circuit include EFR32 chip and rather than the radio frequency link that radio frequency input/output pin electricity is connected; the radio frequency link comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first antenna and a second antenna; the first inductor comprises a first end and a second end, the second inductor comprises a first second end and a second end, the first capacitor comprises a first third end and a second third end, the second capacitor comprises a first T end and a second T end, the first antenna comprises a first V end and a second V end, and the second antenna comprises a first N end and a second N end; the first A end is electrically connected with the radio frequency input and output pin, the second end, the first C end and the first B end are electrically connected with the first E end, the second B end and the first D end are electrically connected with the first E end, and the second C end, the second D end, the second E end and the second E end are all grounded. Therefore, the radio frequency power can be increased, and the second harmonic can be reduced.
Description
Technical Field
The embodiment of the utility model provides a smart home technical field based on wireless communication especially relates to a zigbee smart home wireless module's L type radio frequency matching circuit based on EFR 32.
Background
With the continuous development of the internet of things technology, the traditional household appliances and industrial products generally have networking requirements to realize the interaction between an appliance end and a control end, for example, the remote control of household appliances such as air conditioners, washing machines and refrigerators is realized, namely, the smart home is realized. In order to solve the networking problem of the terminal equipment in the prior art, the solution is to add a wireless communication function in the terminal equipment, that is, add a wireless communication circuit on an existing electronic circuit to realize the wireless communication connection between the terminal equipment and a wireless network. A common wireless communication connection method includes using zigbee network technology, which is a short-distance and low-power consumption wireless communication technology.
At present, an EFR32 chip is applied, and a 2.4GHz high-frequency ZigBee circuit can be realized by means of higher integration level of the chip. However, the existing ZigBee circuit based on EFR32 has low output transmission power and large second harmonic, which results in poor communication quality and short transmission distance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an L type radio frequency matching circuit of zigbee intelligent house wireless module based on EFR32 to increase output transmission power, reduce the second harmonic; thereby being beneficial to improving the communication quality and increasing the transmission distance.
The embodiment of the utility model provides a zigbee intelligence house wireless module's L type radio frequency matching circuit based on EFR32, this circuit includes:
the EFR32 chip comprises a radio frequency input and output pin;
the radio frequency link is electrically connected with the radio frequency input and output pin;
the radio frequency link comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first antenna and a second antenna; the first inductor comprises a first end and a second end, the second inductor comprises a first second end and a second end, the first capacitor comprises a first third end and a second third end, the second capacitor comprises a first T end and a second T end, the first antenna comprises a first T end and a second T end, and the second antenna comprises a first Hex end and a second Hex end; the first A end is electrically connected with the radio frequency input and output pin, the second end, the first C end and the first B end are electrically connected with the first E end, the second B end and the first D end are electrically connected with the first E end, and the second C end, the second E end and the second E end are all grounded.
In one embodiment, the first inductance is 1.8 ± 0.2 nH.
In one embodiment, the first capacitance is a capacitance of 2.0 ± 0.1 pF.
In an embodiment, the second inductance is 3.0 ± 0.2 nH.
In one embodiment, the second capacitance is 1.0 ± 0.1 pF.
The embodiment of the utility model provides an L type radio frequency matching circuit of zigbee intelligent house wireless module based on EFR32, through setting up the radio frequency link and including first inductance, second inductance, first electric capacity, second electric capacity, first antenna and second antenna; the first inductor comprises a first end and a second end, the second inductor comprises a first second end and a second end, the first capacitor comprises a first third end and a second third end, the second capacitor comprises a first T end and a second T end, the first antenna comprises a first V end and a second V end, and the second antenna comprises a first N end and a second N end; the first A end is electrically connected with a radio frequency input/output pin, the second end, the first third end and the first second end are electrically connected with the first fifth end, the second end and the first fifth end are electrically connected with the first sixth end, and the second third end, the second fifth end and the second sixth end are all grounded, so that two L-shaped matching circuits can be formed; therefore, the communication quality can be improved, and the transmission distance can be increased.
Drawings
Fig. 1 is a schematic structural diagram of an L-shaped rf matching circuit of a zigbee smart home wireless module based on EFR32 provided in the related art;
fig. 2 is a schematic structural diagram of an L-shaped rf matching circuit of a zigbee smart home wireless module based on EFR32 according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the utility model provides a zigbee intelligence house wireless module's based on EFR 32L type radio frequency matching circuit includes the following improvement point at least: the radio frequency link is improved on the aspect of components, and two L-shaped matching circuits are added on the basis of related circuits, so that the output radio frequency power can be increased, the second harmonic wave can be reduced, the communication quality can be improved, and the transmission distance can be increased.
The following describes related circuits and the improved circuits of the present invention by way of example in comparison with fig. 1 and 2.
Exemplarily, fig. 1 is a schematic structural diagram of an L-type rf matching circuit of a zigbee smart home wireless module based on EFR32 in the related art, which illustrates a minimum system of an EFR chip U1, and in a case that a supply voltage is 3.3V and a supply current is 0.5A, transmission of a zigbee signal, including transmission and reception of the zigbee signal, may be implemented; the zigbee signal may be converted into a Universal Asynchronous Receiver/Transmitter (UART) signal or a General-purpose input/output (GPIO) port after being processed by the chip U1. The chip U2 is electrically connected with pins of the chip U1, which are marked with the same pin name, correspondingly, the chip U2 is equivalent to a PCB of the chip U1 and can be used as a carrier to realize the electrical connection of the chip U1 and other circuits; namely: the chip U2 and the chip U1 realize the connection between the chip and the module pins, so that customers can develop the chip more quickly and conveniently, and the trouble of matching on radio frequency is reduced.
Illustratively, the radio frequency parameters measured by the circuit shown in fig. 1 using the spectrum testing technique are as follows: radio frequency power: 15.9 dBm; second harmonic: 27.60 dBm. And the standard value of the second harmonic is-30 dBm, and the measured value of the second harmonic of the circuit is larger than the standard value, exceeds the standard, namely does not meet the requirement, and influences the transmission distance and the communication quality.
In order to improve the problem existing in fig. 1, an embodiment of the present invention provides an improved L-type radio frequency matching circuit for a zigbee smart home wireless module based on EFR 32.
Exemplarily, fig. 2 is a schematic structural diagram of an L-type rf matching circuit of a zigbee smart home wireless module based on EFR32 according to an embodiment of the present invention. Referring to fig. 2, the L-shaped rf matching circuit of the zigbee smart home wireless module based on the EFR32 includes: EFR32 chip U1, including radio frequency input output pin 2.4 GRF-IOP; the radio frequency link is electrically connected with the radio frequency input/output pin 2.4 GRF-IOP; the radio frequency link comprises a first inductor L3, a second inductor L4, a first capacitor C17, a second capacitor C18, a first antenna and a second antenna; the first inductor L3 comprises a first A terminal and a second B terminal, the second inductor L4 comprises a first B terminal and a second B terminal, the first capacitor C17 comprises a first C terminal and a second C terminal, the second capacitor C18 comprises a first T terminal and a second T terminal, the first antenna comprises a first V terminal and a second V terminal, and the second antenna comprises a first U terminal and a second U terminal; the first A end is electrically connected with the radio frequency input/output pin 2.4GRF-IOP, the second A end, the first C end and the first B end are electrically connected with the first E end, the second B end and the first D end are electrically connected with the first E end, and the second A end, the second E end and the second E end are all grounded.
The first inductor L3 and the first capacitor C17 form an L-shaped matching circuit, and in the L-shaped matching circuit, the first inductor L3 is connected in series in a radio frequency link and can play a role of passing, reducing and blocking high frequency; the first capacitor C17 is connected in parallel in the radio frequency link and can play a role of passing high frequency and blocking low frequency, and the first capacitor C17 and the first capacitor C are combined to form a band-pass filter, so that interference signals can be filtered; meanwhile, the impedance matching function can be achieved.
The second inductor L4 and the second capacitor C18 form another L-shaped matching circuit, and in the L-shaped matching circuit, the second inductor L4 is connected in series in a radio frequency link, so that a good inhibition effect is achieved on high-frequency signals, and the influence on low-frequency signals is small; the second capacitor C18 is connected in parallel in the radio frequency link, so that high-frequency signals can be better absorbed; meanwhile, the two combine to play a role of matching impedance for the second antenna.
Based on the method, impedance matching is facilitated while noise signals are reduced; thereby facilitating an increase in radio frequency power while reducing second harmonics.
In one embodiment, the first inductor L3 is an inductor of 1.8 ± 0.2 nH.
In one embodiment, the first capacitor C17 is a capacitor of 2.0 ± 0.1 pF.
In one embodiment, the second inductor L4 is an inductor of 3.0 ± 0.2 nH.
In one embodiment, the second capacitor C18 is a capacitor of 1.0 ± 0.1 pF.
In an L-type matching circuit, a first inductor L3 of 1.8nH is connected in series in a radio frequency link, so that the effect of passing low-frequency and high-frequency can be achieved, meanwhile, a first capacitor C17 of 2.0pF is connected in parallel in the radio frequency link, so that the effect of passing high-frequency and low-frequency can be achieved, and the first inductor L3 and the first capacitor C17 can form a band-pass filter in a 2.4G frequency band, so that interference signals in other frequency bands can be filtered twice; in addition, the rf link impedance is controlled to be 50 ohms, and the first inductor L3 of 1.8nH and the first capacitor C17 of 2.0pF in the L-type matching circuit also perform impedance matching. Meanwhile, in the other L-shaped matching circuit, a second inductor L4 of 3.0nH is also connected in series in the radio frequency link, so that a better inhibiting effect is exerted on high-frequency signals, and the influence on low-frequency signals is small; meanwhile, a second capacitor C18 of 1.0pF is connected in parallel in the radio frequency link, so that high-frequency signals can be absorbed, and the impedance matching function can be achieved for an external antenna (i.e. a second antenna).
Based on this, the circuit shown in fig. 2 is tested by using a spectrum test technique, and the measured radio frequency parameters are as follows: radio frequency power: 17.0 dBm; second harmonic: 48.608dBm, meeting the standard value requirement. Meanwhile, the radio frequency power is increased by 1.1dBm, the second harmonic wave is reduced by 21dBm, the communication distance is longer, and the communication quality is more stable.
In other embodiments, while the improvement of the quality of the radio frequency signal can be satisfied, the values of the first inductor L3, the second inductor L4, the first capacitor C17 and the second capacitor C18 can be set according to the radio frequency circuit and the requirement of the L-type radio frequency matching circuit of the zigbee smart home wireless module based on the EFR32, which is not limited by the embodiment of the present invention.
The embodiment of the utility model provides a zigbee intelligence house wireless module's L type radio frequency matching circuit based on EFR32 is through increasing two L type matching circuits, and the radio frequency power of multiplicable output reduces the second harmonic to can improve communication quality, increase transmission distance.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (5)
1. An L-shaped radio frequency matching circuit of a zigbee intelligent home wireless module based on EFR32 is characterized by comprising:
the EFR32 chip comprises a radio frequency input and output pin;
the radio frequency link is electrically connected with the radio frequency input and output pin;
the radio frequency link comprises a first inductor, a second inductor, a first capacitor, a second capacitor, a first antenna and a second antenna; the first inductor comprises a first end and a second end, the second inductor comprises a first second end and a second end, the first capacitor comprises a first third end and a second third end, the second capacitor comprises a first T end and a second T end, the first antenna comprises a first T end and a second T end, and the second antenna comprises a first Hex end and a second Hex end; the first A end is electrically connected with the radio frequency input and output pin, the second end, the first C end and the first B end are electrically connected with the first E end, the second B end and the first D end are electrically connected with the first E end, and the second C end, the second E end and the second E end are all grounded.
2. The L-shaped radio frequency matching circuit of the Zigbee smart home wireless module based on the EFR32 as claimed in claim 1, wherein the first inductance is an inductance of 1.8 +/-0.2 nH.
3. The L-shaped radio frequency matching circuit of the Zigbee smart home wireless module based on the EFR32 as claimed in claim 1, wherein the first capacitance is a capacitance of 2.0 +/-0.1 pF.
4. The L-shaped radio frequency matching circuit of the Zigbee smart home wireless module based on the EFR32 as claimed in claim 1, wherein the second inductance is an inductance of 3.0 +/-0.2 nH.
5. The L-shaped radio frequency matching circuit of the Zigbee smart home wireless module based on the EFR32 as claimed in claim 1, wherein the second capacitance is a capacitance of 1.0 ± 0.1 pF.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092631A (en) * | 2019-12-31 | 2020-05-01 | 成都麦杰康科技有限公司 | 433M communication system for realizing low power consumption |
| CN114244391A (en) * | 2021-12-14 | 2022-03-25 | 北京航天广通科技有限公司分公司 | Radio frequency assembly |
-
2020
- 2020-04-13 CN CN202020541776.5U patent/CN211656142U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092631A (en) * | 2019-12-31 | 2020-05-01 | 成都麦杰康科技有限公司 | 433M communication system for realizing low power consumption |
| CN111092631B (en) * | 2019-12-31 | 2021-10-19 | 成都麦杰康科技有限公司 | 433M communication system for realizing low power consumption |
| CN114244391A (en) * | 2021-12-14 | 2022-03-25 | 北京航天广通科技有限公司分公司 | Radio frequency assembly |
| CN114244391B (en) * | 2021-12-14 | 2023-06-30 | 北京航天广通科技有限公司分公司 | Radio frequency assembly |
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