CN113453346B - Wireless communication device and system - Google Patents
Wireless communication device and system Download PDFInfo
- Publication number
- CN113453346B CN113453346B CN202010223981.1A CN202010223981A CN113453346B CN 113453346 B CN113453346 B CN 113453346B CN 202010223981 A CN202010223981 A CN 202010223981A CN 113453346 B CN113453346 B CN 113453346B
- Authority
- CN
- China
- Prior art keywords
- wireless
- band
- varactor
- pass filter
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a wireless communication device and a system.A control module outputs a corresponding control signal according to the current working channel of a wireless module, a band-pass filter adjusts the center frequency of the band-pass filter after receiving the control signal so as to adapt to the current working channel of the wireless module, and filters a first wireless signal transmitted by the received wireless module or a second wireless signal transmitted by a wireless receiving and transmitting module after adjustment. On the one hand, the band-pass filter can carry out selective filtering on the first wireless signal and the second wireless signal, so that mutual interference between a current working channel and other channels is effectively inhibited, the noise caused by lifting of other equipment and the out-of-band noise of other equipment received by the band-pass filter are reduced, and the normal operation of the wireless communication device is ensured; on the other hand, it is possible to adapt to a plurality of operation channels of the wireless communication apparatus.
Description
Technical Field
The present invention relates to the field of communications devices, and in particular, to a wireless communications device and system.
Background
The present wireless technology is widely applied to the field of data transmission, taking the 2.4G frequency band as an example, and the wireless technology is in an ISM (Industrial Scientific Medical, industrial, scientific and medical frequency band) frequency band, which is an unlicensed frequency band in many countries, and can be used without reporting as long as the transmitting power meets the requirement of regulations. This results in an increasing number of 2.4G band wireless signals in real environments, such as Wi-Fi, bluetooth, zigBee, etc., especially low cost 2.4G band Wi-Fi devices, which are seen everywhere in life. In general, in order to avoid interference between wireless devices in 2.4G frequency band, frequency division technology is widely used, and wireless communication devices in different networks operate on different wireless channels. For example, a common Wi-Fi in the 2.4G band generally employs 13 channels, and referring to fig. 1, fig. 1 is a schematic diagram of a Wi-Fi channel in the 2.4G band. Although some channel differentiation is possible, there are still the following problems:
1) Influence of the present device on other devices: under the influence of factors such as subcarrier intermodulation, the device can raise the noise floor of other adjacent channels, referring to fig. 2 specifically, fig. 2 is a schematic diagram of interference of a common Wi-Fi signal to an adjacent channel, and the raised noise floor can affect communication of devices of other channels.
2) Influence of other devices on the present device: to increase the communication distance, a wireless device in the 2.4G band typically increases a PA (power amplifier) and an LNA (Low Noise Amplifier ) before an antenna, and since the frequency receiving range of the LNA, which is typically increased, is 2400-2483.5MHz or wider, it receives wireless signals (as shown in fig. 3) of channels other than the operating band, and causes the LNA to operate in a saturated state, distorting the signals and disabling the operation. For example, the a router (LNA with high gain) in fig. 3, when the a router accessory has many other 2.4G wireless routers operating, the a router cannot normally communicate with the STA (Station) to which it is connected.
Disclosure of Invention
The invention aims to provide a wireless communication device and a system, on one hand, so that mutual interference between a current working channel and other channels is effectively inhibited, the bottom noise of other equipment lifting and out-of-band noise of other equipment received by the wireless communication device are reduced, and the normal operation of the wireless communication device is ensured; on the other hand, it is possible to adapt to a plurality of operation channels of the wireless communication apparatus.
In order to solve the above technical problems, the present invention provides a wireless communication apparatus, including:
the wireless module is used for transmitting the first wireless signal and/or receiving the second wireless signal filtered by the band-pass filter;
the control module is used for outputting a control signal according to the current working channel of the wireless module;
the band-pass filter is used for adjusting the center frequency of the band-pass filter according to the control signal and filtering the received first wireless signal or the second wireless signal transmitted by the wireless receiving and transmitting module after adjustment.
Preferably, the band pass filter comprises a varactor based LC band pass filter, the control signal comprising a control voltage;
the adjusting the center frequency of the self according to the control signal comprises the following steps:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage, and further adjusting the self center frequency.
Preferably, the adjusting the capacitance value of the varactor according to the control voltage, and then adjusting the center frequency of the varactor, includes:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage so that the difference value between the self center frequency and the center frequency of the current working channel is smaller than a set threshold value.
Preferably, the set threshold is 0.
Preferably, the control voltages include a first control voltage, a second control voltage, and a third control voltage; the LC band-pass filter based on the varactors comprises a first capacitor, a second capacitor, a third capacitor, a first varactor, a second varactor, a third varactor, a first inductor, a second inductor and a third inductor;
one end of the first capacitor is grounded, the other end of the first capacitor is respectively connected with the cathode of the first varactor, one end of the first inductor, the anode of the second varactor and one end of the second capacitor, and the connected common end is grounded to the first control voltage, and the anodes of the first varactors and the other end of the first inductor are grounded; the cathode of the second varactor is connected with the other end of the second capacitor and one end of the second inductor respectively, and the connected common terminal is connected with the second control voltage; the other end of the second inductor is respectively connected with the cathode of the third varactor, one end of the third capacitor and one end of the third inductor, and the connected common end is connected with the third control voltage, and the anode of the third varactor, the other end of the third capacitor and the other end of the third inductor are grounded.
Preferably, the wireless communication device is a wireless communication device with an operating frequency band of 2.4G;
the total capacitance of the first capacitor and the first varactor is 145 to 170pF;
the value range of the total capacitance of the second capacitor and the second varactor is 5 to 5.6pF;
the total capacitance of the third capacitor and the third varactor is 145 to 170pF.
Preferably, the wireless module is a SoC chip, and the control module is integrated in the SoC chip.
Preferably, the wireless module is a Wi-Fi module or a bluetooth module.
Preferably, the wireless module is a WiFi module that is not provided with a processor, and the control module is a WiFi Ap chip.
In order to solve the above technical problem, the present invention further provides a wireless communication system, including a wireless communication device as described above, further including:
and the wireless transceiver module is used for transmitting the second wireless signal and/or receiving the first wireless signal filtered by the LC band-pass filter.
The invention provides a wireless communication device, in which a control module outputs a corresponding control signal according to the current working channel of a wireless module, a band-pass filter adjusts the center frequency of the band-pass filter after receiving the control signal so as to adapt to the current working channel of the wireless module, and filters a first wireless signal transmitted by the received wireless module or a second wireless signal transmitted by a wireless receiving and transmitting module after adjustment. On the one hand, the band-pass filter can carry out selective filtering on the first wireless signal and the second wireless signal, so that mutual interference between a current working channel and other channels is effectively inhibited, the noise caused by lifting of other equipment and the out-of-band noise of other equipment received by the band-pass filter are reduced, and the normal operation of the wireless communication device is ensured; on the other hand, it is possible to adapt to a plurality of operation channels of the wireless communication apparatus.
The invention also provides a wireless communication system which has the same beneficial effects as the wireless communication device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a Wi-Fi channel in a 2.4G band;
fig. 2 is a schematic diagram of interference of a common Wi-Fi signal to an adjacent channel;
FIG. 3 is a diagram of LNA receive saturation distortion;
fig. 4 is a schematic structural diagram of a wireless communication device according to the present invention;
fig. 5 is a schematic circuit diagram of an LC band pass filter based on a varactor according to the present invention;
FIG. 6 is an equivalent view of FIG. 5 provided by the present invention;
fig. 7 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 1 channel;
fig. 8 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 6 channels;
fig. 9 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 11 channels;
fig. 10 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 13 channels;
fig. 11 is a schematic diagram of Wi-Fi signals filtered by the band-pass filter in the present application;
fig. 12 is a schematic diagram of a WiFi signal received by a wireless transceiver module according to the present invention;
fig. 13 is a schematic diagram of a WiFi signal received by a wireless module after filtering the WiFi signal in fig. 12 with a bandpass filter in the present application.
Detailed Description
The core of the invention is to provide a wireless communication device and a system, on one hand, so as to effectively inhibit the mutual interference between the current working channel and other channels, thereby being beneficial to reducing the raised background noise of other equipment and the out-of-band noise of other equipment received by the wireless communication device and ensuring the normal work of the wireless communication device; on the other hand, it is possible to adapt to a plurality of operation channels of the wireless communication apparatus.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a wireless communication device according to the present invention;
the wireless communication device includes:
a wireless module 1, configured to transmit a first wireless signal and/or receive a second wireless signal filtered by an LC band pass filter;
a control module 2 for outputting a control signal according to the current working channel of the wireless module 1;
and the LC band-pass filter is used for adjusting the center frequency of the LC band-pass filter according to the control signal and filtering the received first wireless signal or the second wireless signal transmitted by the wireless receiving and transmitting module after adjustment.
It should be noted that, the wireless module 1 may be a Wi-Fi module or a bluetooth module, and of course, may be any other type of wireless module, which is not particularly limited herein.
Specifically, the wireless module 1 is configured to transmit a first wireless signal and/or receive a second wireless signal, where different wireless modules 1 may work on different channels, for example, the 2.4G frequency band Wi-Fi generally uses 13 channels, some Wi-Fi modules work on 1 channel, some Wi-Fi modules work on 6 channels, some Wi-Fi modules work on 11 channels, some Wi-Fi modules work on 13 channels, etc., and the present application does not limit what channel the wireless module 1 currently works on, depending on the actual situation.
Taking an LC band-pass filter as an example, in order to effectively inhibit interference between the wireless communication device and other wireless communication devices, in the present application, the wireless communication device further includes a control module 2 and an LC band-pass filter, where the LC band-pass filter is disposed between the wireless module 1 and the wireless transceiver module, so that bidirectional filtering can be implemented, and is specifically used for filtering wireless signals transmitted between the two. Before the LC band-pass filter filters the wireless signal between the wireless module 1 and the wireless transceiver module, the center frequency of the LC band-pass filter needs to be adjusted to adapt to the current working channel of the wireless module 1.
Specifically, the control module 2 receives the information including the current working channel of the wireless module 1 sent by the wireless module 1 or the control platform controlling the operation of the wireless module 1, outputs a corresponding control signal according to the preset corresponding relation between the current working signal and the control signal, and after receiving the control signal, the LC band-pass filter can adjust its capacitance value and/or inductance value according to the specific setting of the LC band-pass filter, so as to change its center frequency, and further adapt to the current working channel of the wireless module 1. In addition, since it is easier to adjust the capacitance value than the inductance value in practical applications, the LC band-pass filter can adjust its capacitance value according to the control signal in the present application.
After the center frequency of the LC band-pass filter is adjusted according to the control signal, the LC band-pass filter filters a first wireless signal transmitted by the wireless module 1 and transmits the filtered first wireless signal to the wireless transceiver module; or, the LC band-pass filter filters the second wireless signal transmitted by the wireless transceiver module, and sends the filtered second wireless signal to the wireless module 1. The wireless transceiver module is usually an antenna.
It should be further noted that, the bandwidth of the LC band-pass filter may be set according to the bandwidth of the channel of the wireless module 1, and once the circuit structure of the LC band-pass filter is determined, the bandwidth of the LC band-pass filter is also determined, so as to suppress the interference between the wireless communication device and other wireless communication devices as much as possible, in this application, the bandwidth of the LC band-pass filter is slightly larger than the bandwidth of the operating channel of the wireless module 1, and the operating bandwidth of the wireless module 1 is set to be AMHz, and the bandwidth of the LC band-pass filter may be, but is not limited to, (a+a×5%) MHz, for example, when the operating bandwidth of the wireless module 1 is 20MHz, the operating bandwidth of the LC band-pass filter is slightly larger than 20MHz, for example, 21MHz, and so on.
In summary, in practical applications, only a correspondence between an operating channel of the wireless device, a control signal, and a parameter of a device in the LC band-pass filter, and a center frequency of the LC band-pass filter, is established in advance, and then based on the correspondence, the center frequency of the LC band-pass filter can be adaptively matched with a current operating channel of the wireless device.
In the wireless communication device provided by the invention, the control module 2 outputs the corresponding control signal according to the current working channel of the wireless module 1, the band-pass filter adjusts the center frequency of the band-pass filter after receiving the control signal so as to adapt to the current working channel of the wireless module 1, and filters the received first wireless signal transmitted by the wireless module 1 or the second wireless signal transmitted by the wireless transceiver module after adjustment. On the one hand, the band-pass filter can carry out selective filtering on the first wireless signal and the second wireless signal, so that mutual interference between a current working channel and other channels is effectively restrained, the noise caused by lifting of other equipment and out-of-band noise of other equipment received by the band-pass filter are reduced, the receiving anti-interference capability of the band-pass filter is improved, and the normal operation of the wireless communication device is ensured; on the other hand, it is possible to adapt to a plurality of operation channels of the wireless communication apparatus.
Based on the above embodiments:
as a preferred embodiment, the band-pass filter comprises a varactor-based LC band-pass filter, the control signal being a control voltage;
the center frequency of the self is adjusted according to the control signal, which comprises the following steps:
and adjusting the capacitance value of the varactor according to the control voltage, and further adjusting the self center frequency.
The present application considers that the capacitance value adjustment is simpler than the adjustment of the inductance value in the LC band pass filter, and therefore, in the present application, the LC band pass filter includes a LC band pass filter based on varactors, that is, varactors are disposed in the LC band pass filter, and the number and the disposition position of the varactors are related to the structure of the LC band pass filter. The varactor is a semiconductor that changes the junction capacitance according to the voltage change across the device, and is used as a variable capacitor, and accordingly, the control signal is a control voltage. When the number of varactors is plural, the control voltage is plural accordingly. In addition, the change of the control voltage has the same or opposite trend with the center frequency of the current operation channel, for example, the higher the center frequency of the current operation channel, the higher the control voltage value; alternatively, the higher the center frequency of the current operating channel, the lower the control voltage value, in particular determined by the control module 2.
Specifically, when the LC band-pass filter is a varactor-based LC band-pass filter, the control module 2 outputs a control voltage to a corresponding varactor port through a pin, and the varactor changes its capacitance value according to the control voltage, so that the capacitance value of the entire LC band-pass filter is also changed, thereby realizing adjustment of the center frequency of the LC band-pass filter. Therefore, the center frequency of the LC band-pass filter is adjusted based on the varactor, the adjustment mode is simple, and the accuracy and the reliability are high.
As a preferred embodiment, the adjustment of the capacitance value of the varactor according to the control voltage, and thus the center frequency of the varactor, includes:
and adjusting the capacitance value of the varactor according to the control voltage so that the difference value between the center frequency of the varactor and the center frequency of the current working channel is smaller than a set threshold value.
Specifically, in the above embodiment, it is mentioned that, in order to suppress the interference between the wireless communication device and other wireless communication devices as much as possible, the bandwidth of the LC band-pass filter is slightly larger than the operating bandwidth of the wireless module 1, and meanwhile, in order to adapt the center frequency of the LC band-pass filter to the center frequency of the current operating channel, in this application, it is required that after the capacitance value of the varactor is adjusted according to the control voltage, the difference between the center frequency of the LC band-pass filter and the center frequency of the current operating channel is smaller than a set threshold, that is, the center frequency of the LC band-pass filter is as close to the center frequency of the current operating channel as possible, so that the LC band-pass filter can filter the wireless signals of the wireless module 1 except for the operating channel, thereby reducing the interference to other wireless communication modules, and reducing the interference to the wireless communication modules.
The specific numerical value for setting the threshold value is not particularly limited in the present application, and is determined according to actual conditions.
As a preferred embodiment, the threshold value is set to 0.
In this embodiment, after the capacitance value of the varactor is required to be adjusted according to the control voltage, the center frequency of the LC band-pass filter is equal to the center frequency of the current working channel, so that the LC band-pass filter is completely matched with the center frequency of the current working channel of the wireless module 1, thereby further improving the anti-interference performance of the LC band-pass filter and further reducing the interference to other channels.
As a preferred embodiment, the control voltages include a first control voltage, a second control voltage, and a third control voltage; the varactor-based LC band pass filter includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first varactor Cp1, a second varactor Cp2, a third varactor Cp3, a first inductance L1, a second inductance L2, and a third inductance L3;
one end of the first capacitor C1 is grounded, the other end of the first capacitor C1 is respectively connected with the cathode of the first varactor Cp1, one end of the first inductor L1, the anode of the second varactor Cp2 and one end of the second capacitor C2, and the connected common end is grounded to a first control voltage, and the anode of the first varactor Cp1 and the other end of the first inductor L1 are grounded; the cathode of the second varactor Cp2 is connected with the other end of the second capacitor C2 and one end of the second inductor L2 respectively, and the connected common end is connected with a second control voltage; the other end of the second inductor L2 is connected to the cathode of the third varactor Cp3, one end of the third capacitor C3, and one end of the third inductor L3, respectively, and the connected common terminal is connected to the third control voltage, and the anode of the third varactor Cp3, the other end of the third capacitor C3, and the other end of the third inductor L3 are all grounded.
As a preferred embodiment, the wireless communication device is a wireless communication device with an operating frequency band of 2.4G;
the total capacitance of the first capacitor C1 and the first varactor Cp1 is in the range of 145 to 170pF;
the total capacitance of the second capacitor C2 and the second varactor Cp2 has a value ranging from 5 to 5.6pF;
the total capacitance of the third capacitor C3 and the third varactor Cp3 has a value ranging from 145 to 170pF.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an LC band-pass filter based on a varactor according to the present invention.
In this embodiment, the LC band-pass filter is a third-order butterworth LC band-pass filter, and includes a first capacitor C1, a second capacitor C2, and a third capacitor C3, where two ends of the three capacitors are connected in parallel with one varactor, and then the total capacitance of the first capacitor C1 and the first varactor Cp1 (hereinafter referred to as a first total capacitance Cx) becomes a sum of the capacitance of the first capacitor C1 and the capacitance of the first varactor Cp1, the total capacitance of the second capacitor C2 and the second varactor Cp2 (hereinafter referred to as a second total capacitance Cy) becomes a sum of the capacitance of the second capacitor C2 and the capacitance of the second varactor Cp2, the total capacitance of the third capacitor C3 and the third varactor Cp3 (hereinafter referred to as a third total capacitance Cz) becomes a sum of the capacitance of the third capacitor C3 and the capacitance of the third varactor Cp3, and the total capacitance of the third varactor Cp2 is changed by changing the sum of the capacitance of the first capacitor C1, the second control voltage and the third varactor Cp2, and the third varactor Cp3, and the total capacitance of the third varactor Cp3 is changed.
In view of this, a wireless communication apparatus having an operating band of 2.4G will be described as an example:
to accommodate the 2.4G Wi-Fi band, the 3dB bandwidth of the LC band-pass filter is 20MHz, and the applicable frequency range is 2400 to 2483.5MHz. For circuit debugging, the recommended range of capacitance values is shown in table 2:
TABLE 1 2.4G Wi-Fi band, 20MHz band capacitance value Table
| Capacitor assembly | Range |
| C1+Cp1 | 145 to 170pF |
| C2+Cp2 | 5.00 to 5.60fF |
| C3+Cp3 | 145 to 170pF |
Considering that the common 2.4G Wi-Fi channels are 1, 6, 11 and 13 channels, the application provides the capacitance values of the capacitors in the three-order Butterworth type LC band-pass filter under the four channels.
TABLE 2 capacitance combination value Table under different Wi-Fi channels
| Channel(s) | Channel center frequency MHz | Channel frequency range MHz | Sum of C1+Cp1 | Sum of C2+Cp2 | Sum of C3+ |
| 1 | 2412 | 2402 to 2422 | 161.5pF | 5.47fF | 161.5 |
| 6 | 2437 | 2427 to 2447 | 158.0pF | 5.36fF | 158.0 |
| 11 | 2462 | 2452 to 2472 | 155.0pF | 5.25fF | 155.0 |
| 13 | 2472 | 2462 to 2482 | 153.5pF | 5.21fF | 153.5pF |
Specifically, referring to fig. 6, fig. 6 is an equivalent diagram of fig. 5 provided by the present invention, wherein the first total capacitance cx=c1+cp 1, the second total capacitance cy=c2+cp 2, the third total capacitance cz=c3+cp 3, and the first control voltage is equal to the third control voltage.
Specifically, when the 2.4G Wi-Fi channel is 1 channel, the first inductance l1=27 pH, the second inductance l2=796 nH, the third inductance l3=27 pH, the first total capacitance cx=c1+cp 1=161.5 pF, the second total capacitance cy=c2+cp 2=5.47 fF, and the third total capacitance cz=c3+cp 3=161.5 pF. Referring to fig. 7, fig. 7 is a frequency response diagram of S12 (reverse transmission coefficient) of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 1 channel.
When the 2.4G Wi-Fi channel is 6 channels, the first inductance l1=27 pH, the second inductance l2=796 nH, the third inductance l3=27 pH, the first total capacitance cx=c1+cp 1= 158.0pF, the second total capacitance cy=c2+cp 2=5.36 fF, and the third total capacitance cz=c3+cp 3= 158.0pF. Referring to fig. 8, fig. 8 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 6 channels.
When the 2.4G Wi-Fi channel is 11 channels, the first inductance l1=27 pH, the second inductance l2=796 nH, the third inductance l3=27 pH, the first total capacitance cx=c1+cp 1=155.0 pF, the second total capacitance cy=c2+cp 2=5.25 fF, and the third total capacitance cz=c3+cp 3=155.0 pF. Referring to fig. 9, fig. 9 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 11 channels.
When the 2.4G Wi-Fi channel is 13 channels, the first inductance l1=27 pH, the second inductance l2=796 nH, the third inductance l3=27 pH, the first total capacitance cx=c1+cp 1=153.5pf, the second total capacitance cy=c2+cp 2=5.21 fF, and the third total capacitance cz=c3+cp 3=153.5pf. Referring to fig. 10, fig. 10 is a frequency response diagram of S12 of the LC band pass filter when the 2.4G Wi-Fi channel provided by the present invention is 13 channels.
Referring to fig. 11, fig. 11 is a schematic diagram of a Wi-Fi signal filtered by a band-pass filter according to the present invention.
Therefore, the three-order Butterworth type LC band-pass filter provided by the invention can adjust the capacitance value of the varactor according to the control voltage, so as to adjust the self center frequency, and has the advantages of simple structure, no need of arranging devices with large volume, high cost and low cost, such as a switch.
The above embodiments take the LC band-pass filter of the third-order butterworth type as an example, and can be extended to other band-pass filters of higher order or lower order, and the principle is equally applicable to other band-pass filters of different types such as K-type, m-derived type, chebyshev type, bessel type, gaussian type, elliptic function type, inverse chebyshev type, and the like.
As a preferred embodiment, the wireless module 1 is a SoC (System on Chip) Chip, and the control module 2 is integrated in the SoC Chip.
Specifically, if the wireless module 1 is an SoC chip, since the SoC chip has an MCU or a CPU and the SoC chip has many pins and is capable of generating control signals externally, the control module 2 may be integrated in the SoC chip at this time, so that the SoC chip may not only be capable of transmitting the first wireless signal and/or receiving the second wireless signal filtered by the LC band pass filter, but also be capable of outputting control signals according to the current working channel of the wireless module 1.
If the wireless module 1 cannot output the control signal according to the current operation channel of the wireless module 1 and/or there are not enough pins to output the control signal, the control module 2 is additionally provided to output the control signal according to the current operation channel of the wireless module 1. As a preferred embodiment, the wireless module 1 is a WiFi module without a processor, and the control module is a WiFi Ap (Access Point) chip. In this case, although the WiFi module cannot output the control signal according to the current operation channel of the wireless module 1, since the MCU or the CPU is provided in the WiFi Ap chip, the WiFi Ap chip can output the control signal according to the current operation channel of the wireless module 1.
Referring to fig. 12 and fig. 13, fig. 12 is a schematic diagram of a WiFi signal received by a wireless transceiver module according to the present invention, and fig. 13 is a schematic diagram of a WiFi signal received by a wireless module after the WiFi signal in fig. 12 is filtered by a band-pass filter in the present application.
Obviously, the WiFi signals received by the wireless transceiver module include WiFi signals of each channel, as shown in fig. 12, and after being filtered by the wireless communication device provided by the application, useful WiFi signals are obtained, as shown in fig. 13. On the one hand, the band-pass filter can selectively filter the second wireless signal, so that mutual interference between the current working channel and other channels is effectively inhibited, the out-of-band noise of other equipment received by the band-pass filter is reduced, the anti-interference receiving capability of the band-pass filter is improved, and the normal operation of the wireless communication device is ensured; on the other hand, it is possible to adapt to a plurality of operation channels of the wireless communication apparatus.
The invention also provides a wireless communication system, which comprises the wireless communication device and further comprises:
and the wireless transceiver module is used for transmitting the second wireless signal and/or receiving the first wireless signal filtered by the LC band-pass filter.
For an introduction of a wireless communication system provided by the present invention, reference is made to the introduction of the wireless communication device, and the description of the present invention is omitted herein.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A wireless communications apparatus, comprising:
the wireless module is used for transmitting the first wireless signal and/or receiving the second wireless signal filtered by the band-pass filter;
the control module is used for outputting a control signal according to the current working channel of the wireless module;
the band-pass filter is used for adjusting the center frequency of the band-pass filter according to the control signal and filtering the received first wireless signal or the second wireless signal transmitted by the wireless transceiver module after adjustment;
the band pass filter comprises a varactor based LC band pass filter, and the control signal comprises a control voltage;
the adjusting the center frequency of the self according to the control signal comprises the following steps:
the capacitance value of the variable capacitance diode is adjusted according to the control voltage, and then the self center frequency is adjusted;
the control voltage comprises a first control voltage, a second control voltage and a third control voltage; the LC band-pass filter based on the varactors comprises a first capacitor, a second capacitor, a third capacitor, a first varactor, a second varactor, a third varactor, a first inductor, a second inductor and a third inductor;
one end of the first capacitor is grounded, the other end of the first capacitor is respectively connected with the cathode of the first varactor, one end of the first inductor, the anode of the second varactor and one end of the second capacitor, and the connected common end is grounded to the first control voltage, and the anodes of the first varactors and the other end of the first inductor are grounded; the cathode of the second varactor is connected with the other end of the second capacitor and one end of the second inductor respectively, and the connected common terminal is connected with the second control voltage; the other end of the second inductor is respectively connected with the cathode of the third varactor, one end of the third capacitor and one end of the third inductor, and the connected common end is connected with the third control voltage, and the anode of the third varactor, the other end of the third capacitor and the other end of the third inductor are grounded.
2. The wireless communications apparatus of claim 1, wherein the adjusting the capacitance of the varactor according to the control voltage, and thus the center frequency thereof, comprises:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage so that the difference value between the self center frequency and the center frequency of the current working channel is smaller than a set threshold value.
3. The wireless communications apparatus of claim 2, wherein the set threshold is 0.
4. The wireless communication device of claim 1, wherein the wireless communication device is a wireless communication device with an operating frequency band of 2.4G;
the total capacitance of the first capacitor and the first varactor is 145 to 170pF;
the value range of the total capacitance of the second capacitor and the second varactor is 5 to 5.6pF;
the total capacitance of the third capacitor and the third varactor is 145 to 170pF.
5. The wireless communication apparatus of any of claims 1-4, wherein the wireless module is a SoC chip, the control module being integrated in the SoC chip.
6. The wireless communication apparatus of any of claims 1-4, wherein the wireless module is a Wi-Fi module or a bluetooth module.
7. The wireless communication device of any of claims 1-4, wherein the wireless module is a WiFi module without a processor, and the control module is a WiFi Ap chip.
8. A wireless communication system comprising the wireless communication apparatus of any of claims 1 to 7, further comprising:
and the wireless transceiver module is used for transmitting the second wireless signal and/or receiving the first wireless signal filtered by the band-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010223981.1A CN113453346B (en) | 2020-03-26 | 2020-03-26 | Wireless communication device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010223981.1A CN113453346B (en) | 2020-03-26 | 2020-03-26 | Wireless communication device and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113453346A CN113453346A (en) | 2021-09-28 |
| CN113453346B true CN113453346B (en) | 2023-04-21 |
Family
ID=77807138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010223981.1A Active CN113453346B (en) | 2020-03-26 | 2020-03-26 | Wireless communication device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113453346B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989264A (en) * | 1987-09-30 | 1991-01-29 | Kabushiki Kaisha Toshiba | Bandwidth limiting circuit with variable bandwidth |
| US5065453A (en) * | 1989-03-20 | 1991-11-12 | General Electric Company | Electrically-tunable bandpass filter |
| US6518859B1 (en) * | 1999-09-07 | 2003-02-11 | Itis Corporation | Frequency controlled filter for the UHF band |
| CN106301463A (en) * | 2016-08-29 | 2017-01-04 | 上海斐讯数据通信技术有限公司 | A kind of WIFI circuit improving filtering performance and method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100072690A (en) * | 2008-12-22 | 2010-07-01 | 한국전자통신연구원 | Wideband variable frequency band pass filter |
-
2020
- 2020-03-26 CN CN202010223981.1A patent/CN113453346B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989264A (en) * | 1987-09-30 | 1991-01-29 | Kabushiki Kaisha Toshiba | Bandwidth limiting circuit with variable bandwidth |
| US5065453A (en) * | 1989-03-20 | 1991-11-12 | General Electric Company | Electrically-tunable bandpass filter |
| US6518859B1 (en) * | 1999-09-07 | 2003-02-11 | Itis Corporation | Frequency controlled filter for the UHF band |
| CN106301463A (en) * | 2016-08-29 | 2017-01-04 | 上海斐讯数据通信技术有限公司 | A kind of WIFI circuit improving filtering performance and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113453346A (en) | 2021-09-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7003265B2 (en) | System and method for filtering signals in a transceiver | |
| US20150236748A1 (en) | Devices and Methods for Duplexer Loss Reduction | |
| JP2009530939A (en) | Transmitter, power amplifier, and filtering method | |
| CN113972925B (en) | Radio frequency transceiving switch circuit, radio frequency front-end circuit and radio frequency transceiver | |
| CN114095049B (en) | Radio frequency receiving and transmitting switch circuit, radio frequency front-end circuit and radio frequency transceiver | |
| US20190165754A1 (en) | Apparatus for Radio-Frequency Matching Networks and Associated Methods | |
| CN108540164B (en) | Radio frequency front-end system | |
| CN110572180B (en) | Anti-interference data chain system of unmanned aerial vehicle | |
| CN113453346B (en) | Wireless communication device and system | |
| CN113972926B (en) | Radio frequency receiving and transmitting switch circuit, radio frequency front-end circuit and radio frequency transceiver | |
| CN111758218A (en) | Electronic RF filter | |
| US10491193B2 (en) | Circuit for suppressing signals adjacent to a passband | |
| KR20150040940A (en) | Filter device and duplexer | |
| CN216390937U (en) | WIFI6E band-pass filter, related equipment and chip | |
| US11211911B2 (en) | Capacitive-coupled bandpass filter | |
| CN111277223B (en) | High-order coupling network with interference suppression and application thereof | |
| CN215646742U (en) | A variable high pass filter of cut-off frequency for WIFI5G frequency channel | |
| KR100835966B1 (en) | Antenna switch | |
| CN209930217U (en) | Filter circuit and filter device | |
| CN220528042U (en) | Radio frequency front-end module and communication equipment | |
| CN215989210U (en) | Antenna module and mobile device | |
| CN219875693U (en) | Band elimination frequency hopping filter | |
| KR100459545B1 (en) | Apparatus for transmitting of radio signal in mobile terminal and controlling method thereof | |
| CN213521808U (en) | Band-pass filter circuit of radio frequency amplifier chip | |
| WO2024057696A1 (en) | High frequency circuit and communication apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |