CN113453346A - Wireless communication device and system - Google Patents
Wireless communication device and system Download PDFInfo
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- CN113453346A CN113453346A CN202010223981.1A CN202010223981A CN113453346A CN 113453346 A CN113453346 A CN 113453346A CN 202010223981 A CN202010223981 A CN 202010223981A CN 113453346 A CN113453346 A CN 113453346A
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- 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
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- 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
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- 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, wherein a control module outputs a corresponding control signal according to a 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 a received first wireless signal transmitted by the wireless module or a received second wireless signal transmitted by a wireless transceiver module is filtered after adjustment. On one hand, the band-pass filter can selectively filter the first wireless signal and the second wireless signal, so that mutual interference between the current working channel and other channels is effectively inhibited, the bottom noise raised by the band-pass filter on other equipment and the out-of-band noise of the other equipment received by the band-pass filter are favorably reduced, and the normal work of the wireless communication device is ensured; on the other hand, it can be adapted to a plurality of operating 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 apparatus and system.
Background
Nowadays, a wireless technology is widely applied to the field of data transmission, taking a 2.4G frequency band as an example, since the wireless technology is in an ISM (Industrial Scientific Medical) frequency band, the wireless technology is an unlicensed frequency band in many countries, and the frequency band can be used without preparation as long as the transmission power meets the regulatory requirements. This results in an increasing number of 2.4G band wireless signals in practical environments, such as Wi-Fi, bluetooth, ZigBee, etc., especially low cost 2.4G band Wi-Fi devices, which are visible everywhere in life. Generally, in order to avoid mutual interference, frequency division technology is widely used for wireless devices in 2.4G frequency band, and wireless communication devices in different networks operate in different wireless channels. For example, a 2.4G band Wi-Fi usually uses 13 channels, please refer to fig. 1, and fig. 1 is a schematic diagram of a 2.4G band Wi-Fi channel. Although some channel differentiation can be made, the following problems still exist:
1) the influence of this equipment on other equipment: specifically, referring to fig. 2, fig. 2 is a schematic diagram illustrating interference of a common Wi-Fi signal to an adjacent channel, and the raised bottom noise may also affect communication of devices in other channels.
2) Influence of other devices on the present device: in order to increase the communication distance, a typical 2.4G band wireless device may add a PA (power Amplifier) and an LNA (Low Noise Amplifier) before an antenna, and since the frequency receiving range of the LNA is 2400-2483.5MHz or wider, the LNA may receive wireless signals of other channels (as shown in fig. 3) except for the operating band, so that the LNA operates in a saturation state, and the signals are distorted and cannot operate. For example, in the a router (with a high-gain LNA built in) in fig. 3, when there are many other 2.4G wireless routers in operation, 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 wireless communication system, on one hand, the mutual interference between a current working channel and other channels is effectively inhibited, the bottom noise raised by the wireless communication device on other equipment and the out-of-band noise received by the wireless communication device on the other equipment are favorably reduced, and the normal work of the wireless communication device is ensured; on the other hand, it can be adapted to a plurality of operating channels of the wireless communication apparatus.
To solve the above technical problem, the present invention provides a wireless communication apparatus, including:
the wireless module is used for transmitting a first wireless signal and/or receiving a second wireless signal filtered by a 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.
Preferably, the band pass filter comprises a varactor-based LC band pass filter, the control signal comprising a control voltage;
the adjusting of the center frequency of the controller according to the control signal includes:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage, and further adjusting the center frequency of the variable capacitance diode.
Preferably, the adjusting the capacitance value of the varactor according to the control voltage, and further adjusting the center frequency of the varactor, includes:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage so as to enable the difference value between the center frequency of the variable capacitance diode and the center frequency of the current working channel to be smaller than a set threshold value.
Preferably, the set threshold is 0.
Preferably, the control voltage includes a first control voltage, a second control voltage, and a third control voltage; the LC band-pass filter based on the variable capacitance diode comprises a first capacitor, a second capacitor, a third capacitor, a first variable capacitance diode, a second variable capacitance diode, a third variable capacitance diode, 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 variable capacitance diode, one end of the first inductor, the anode of the second variable capacitance diode and one end of the second capacitor, the connected common end is connected with the first control voltage, and the anode of the first variable capacitance diode and the other end of the first inductor are both grounded; the cathode of the second variable capacitance diode is respectively connected with the other end of the second capacitor and one end of the second inductor, and the connected common end is connected with the second control voltage; the other end of the second inductor is connected with the cathode of the third variable capacitance diode, one end of the third capacitor and one end of the third inductor respectively, the connected common end of the second inductor is connected with the third control voltage, and the anode of the third variable capacitance diode, the other end of the third capacitor and the other end of the third inductor are all grounded.
Preferably, the wireless communication device is a wireless communication device with an operating frequency band of 2.4G;
the value range of the first capacitor and the total capacitance of the first variable capacitance diode is 145-170 pF;
the value range of the second capacitor and the total capacitance of the second variable capacitance diode is 5-5.6 pF;
the value of the total capacitance of the third capacitance and the third varactor is in the range of 145 to 170 pF.
Preferably, the wireless module is an 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 without 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 the above wireless communication apparatus, 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, wherein a control module outputs a corresponding control signal according to a 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 a received first wireless signal transmitted by the wireless module or a received second wireless signal transmitted by a wireless transceiver module is filtered after adjustment. On one hand, the band-pass filter can selectively filter the first wireless signal and the second wireless signal, so that mutual interference between the current working channel and other channels is effectively inhibited, the bottom noise raised by the band-pass filter on other equipment and the out-of-band noise of the other equipment received by the band-pass filter are favorably reduced, and the normal work of the wireless communication device is ensured; on the other hand, it can be adapted to a plurality of operating 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 in the embodiments of the present invention, the drawings needed in the prior art and the embodiments 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 without creative efforts.
FIG. 1 is a schematic diagram of a 2.4G band Wi-Fi channel;
FIG. 2 is a diagram illustrating interference of a conventional Wi-Fi signal with an adjacent channel;
FIG. 3 is a schematic diagram of an LNA receiving 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 diode according to the present invention;
FIG. 6 is an equivalent diagram of FIG. 5 provided in accordance with the present invention;
FIG. 7 is a frequency response graph of S12 of an LC band-pass filter when a 2.4G Wi-Fi channel is a 1 channel according to the present invention;
FIG. 8 is a frequency response graph of S12 of an LC band-pass filter when a 2.4G Wi-Fi channel provided by the present invention is a 6-channel;
FIG. 9 is a frequency response graph of S12 of an LC band-pass filter when a 2.4G Wi-Fi channel provided by the present invention is an 11 channel;
FIG. 10 is a graph of the frequency response of S12 of an LC band-pass filter when a 2.4G Wi-Fi channel is 13 channels according to the present invention;
FIG. 11 is a schematic diagram of a Wi-Fi signal filtered by a band-pass filter according to 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 by using the band-pass 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, the mutual interference between the current working channel and other channels is effectively inhibited, the invention is beneficial to reducing the self-raised bottom noise of other equipment and the self-received out-of-band noise of other equipment, and the normal work of the wireless communication device is ensured; on the other hand, it can be adapted to a plurality of operating channels of the wireless communication apparatus.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 apparatus includes:
the wireless module 1 is used for transmitting a first wireless signal and/or receiving a second wireless signal filtered by an LC band-pass filter;
the control module 2 is used 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 transceiver module after adjustment.
It should be noted that the wireless module 1 may be a Wi-Fi module or a bluetooth module, and may also be other types of wireless modules, which is not limited in this application.
Specifically, the wireless module 1 is configured to transmit a first wireless signal and/or receive a second wireless signal, different wireless modules 1 may operate on different channels, for example, 2.4G frequency band Wi-Fi generally employs 13 channels, some Wi-Fi modules operate on 1 channel, some Wi-Fi modules operate on 6 channels, some Wi-Fi modules operate on 11 channels, some Wi-Fi modules operate on 13 channels, and the like.
Taking LC band pass filter as an example, in order to effectively suppress interference between the wireless communication device and other wireless communication devices, in this 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, and can implement bidirectional filtering, specifically configured to filter wireless signals transmitted therebetween. 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 information including a current working channel of the wireless module 1 sent by the wireless module 1 or a control platform controlling the wireless module 1 to work, and outputs a corresponding control signal according to a preset corresponding relationship between the current working signal and the control signal, after receiving the control signal, the LC band-pass filter may adjust a capacitance value and/or an inductance value of the LC band-pass filter according to a specific setting of the LC band-pass filter to change a center frequency of the LC band-pass filter, so as to adapt to the current working channel of the wireless module 1. In addition, considering that it is easier to adjust the capacitance value than the inductance value in practical applications, in the present application, the LC band pass filter can adjust its capacitance value according to the control signal.
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 sends 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. It should be noted that, the wireless transceiver module is generally an antenna.
It should be 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, and in order to suppress 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 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 the like.
In summary, in practical applications, it is only necessary to establish a correspondence relationship between an operating channel of the wireless device, the control signal, and a parameter of a device in the LC band-pass filter, and a center frequency of the LC band-pass filter in advance, and then based on the correspondence relationship, the center frequency of the LC band-pass filter can be adaptively matched with a current operating channel of the wireless device.
In a wireless communication device provided by the present invention, the control module 2 outputs a corresponding control signal according to the current working channel of the wireless module 1, the bandpass filter adjusts its own center frequency after receiving the control signal 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 received second wireless signal transmitted by the wireless transceiver module after adjustment. On one hand, the band-pass filter can selectively filter the first wireless signal and the second wireless signal, so that mutual interference between the current working channel and other channels is effectively inhibited, the bottom noise raised by the band-pass filter on other equipment and the out-of-band noise of the other equipment received by the band-pass filter are favorably reduced, the receiving anti-interference capacity of the band-pass filter is improved, and the normal work of the wireless communication device is ensured; on the other hand, it can be adapted to a plurality of operating channels of the wireless communication apparatus.
On the basis of the above-described embodiment:
as a preferred embodiment, the band pass filter comprises a varactor-based LC band pass filter, the control signal being a control voltage;
adjusting the center frequency of the antenna according to the control signal, comprising:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage, and further adjusting the center frequency of the variable capacitance diode.
This application considers comparing with the inductance value in adjusting LC band pass filter, and the capacitance value adjusts simpler some, consequently, in this application, LC band pass filter includes the LC band pass filter based on varactor, is also provided with varactor in the LC band pass filter, and varactor's number and setting position are relevant with LC band pass filter's structure. A varactor is a semiconductor that changes junction capacitance according to voltage variation between two terminals of a device, and is used as a variable capacitor, and accordingly, a control signal is a control voltage. When the number of the varactor diodes is plural, the control voltage is correspondingly plural. In addition, the change of the control voltage has the same or opposite trend with the center frequency of the current working channel, for example, the higher the center frequency of the current working channel is, the higher the control voltage value is; alternatively, the higher the center frequency of the current working channel is, the lower the control voltage value is, which is specifically determined by the control module 2.
Specifically, when LC band pass filter is varactor-based LC band pass filter, control module 2 passes through pin output control voltage to corresponding varactor port, and the varactor changes the capacitance value of self according to control voltage, and then whole LC band pass filter's capacitance value also can change to the adjustment of LC band pass filter's central frequency has been realized. Therefore, the center frequency of the LC band-pass filter is adjusted based on the varactor diode, the adjustment mode is simple, and the precision and the reliability are high.
As a preferred embodiment, adjusting the capacitance value of the varactor according to the control voltage, and further 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 center frequency of the variable capacitance diode and the center frequency of the current working channel is smaller than a set threshold value.
Specifically, in the above embodiments, in order to suppress 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 at the same time, in order to adapt the center frequency of the LC band-pass filter to the center frequency of the current operating channel, in the present application, after the capacitance value of the varactor diode is adjusted according to the control voltage, a 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 as possible to the center frequency of the current operating channel, so that the LC band-pass filter can filter out wireless signals of the wireless module 1 except for the operating channel, thereby reducing interference to itself to other wireless communication modules as well as interference to itself by other wireless communication modules, the anti-interference performance is good.
The specific value of the threshold is not particularly limited in the present application and is determined according to the actual situation.
As a preferred embodiment, the threshold value is set to 0.
In this embodiment, after the capacitance value of the varactor is 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, the interference immunity of the LC band-pass filter is further improved, and the interference to other channels is further reduced.
As a preferred embodiment, the control voltage includes 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 inductor L1, a second inductor L2, and a third inductor 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, the common end of the two ends is connected with a first control voltage, and the anode of the first varactor Cp1 and the other end of the first inductor L1 are both grounded; the cathode of the second varactor Cp2 is respectively connected with the other end of the second capacitor C2 and one end of the second inductor L2, and the common end of the connection 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, the one end of the third capacitor C3, and the one end of the third inductor L3, respectively, and a common terminal of the second inductor L2 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 ranges from 145 pF to 170 pF;
the total capacitance of the second capacitor C2 and the second varactor Cp2 ranges from 5 to 5.6 pF;
the total capacitance of the third capacitor C3 and the third varactor Cp3 ranges from 145 to 170 pF.
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an LC band pass filter based on a varactor diode 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, and a varactor diode is connected in parallel to each of the three capacitors, so that the total capacitance (hereinafter referred to as a first total capacitance Cx variation) of the first capacitor C1 and the first varactor diode Cp1 is the sum of the capacitance of the first capacitor C1 and the capacitance of the first varactor diode Cp1, the total capacitance (hereinafter referred to as a second total capacitance Cy) of the second capacitor C2 and the second varactor Cp2 is the sum of the capacitance of the second capacitor C2 and the capacitance of the second varactor Cp2, the total capacitance (hereinafter referred to as a third total capacitance Cz) of the third capacitor C3 and the third varactor diode Cp3 is the sum of the capacitance C3 and the capacitance Cp3, and Cp of the third varactor diode Cp 584836 is changed by changing the first control voltage, the second control voltage, and the third control voltage, respectively corresponding to the value of the first control voltage Cp1, The capacitance value of the second varactor Cp2 and the capacitance value of the third varactor Cp3 are further changed to change the first total capacitance value Cx, the second total capacitance value Cy and the third total capacitance value Cz, and finally, the center frequency of the LC band-pass filter is changed.
Based on this, the following description will be given taking a wireless communication apparatus as an example of a wireless communication apparatus with an operating frequency band of 2.4G:
in order to adapt to the 2.4G Wi-Fi frequency band, the 3dB bandwidth of the LC band-pass filter is 20MHz, and the applicable frequency range is 2400-2483.5 MHz. For ease of circuit debugging, the recommended range of capacitance values is shown in table 2:
TABLE 12.4G Wi-Fi frequency band capacitance value table with 20MHz bandwidth
| Capacitor combination | 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 four channels, 1, 6, 11 and 13, the present application provides capacitance values of the capacitance in the LC band pass filter of the third order butterworth type under the four channels.
TABLE 2 capacitance combination value Table for different Wi-Fi channels
| Channel with a plurality of channels | Channel center frequency MHz | Channel frequency range MHz | Sum of C1+ Cp1 | Sum of C2+ Cp2 | Sum of |
| 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, wherein the first total capacitance value Cx is C1+ Cp1, the second total capacitance value Cy is C2+ Cp2, the third total capacitance value Cz is C3+ Cp3, 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 ═ 27pH, the second inductance L2 ═ 796nH, the third inductance L3 ═ 27pH, the first total capacitance Cx ═ C1+ Cp1 ═ 161.5pF, the second total capacitance Cy ═ C2+ Cp2 ═ 5.47fF, and the third total capacitance Cz ═ C3+ Cp3 ═ 161.5 pF. Referring to fig. 7, fig. 7 is a frequency response diagram of S12 (inverse transmission coefficient) of the LC band-pass filter when the 2.4G Wi-Fi channel is a 1 channel according to the present invention.
When the 2.4G Wi-Fi channel is a 6 channel, the first inductance L1 is 27pH, the second inductance L2 is 796nH, the third inductance L3 is 27pH, the first total capacitance Cx is C1+ Cp1 is 158.0pF, the second total capacitance Cy is C2+ Cp2 is 5.36fF, and the third total capacitance Cz is C3+ Cp3 is 158.0 pF. Referring to fig. 8, fig. 8 is a frequency response diagram of S12 of the LC band pass filter when a 2.4G Wi-Fi channel is 6 channels according to the present invention.
When the 2.4G Wi-Fi channel is an 11 channel, the first inductance L1 is 27pH, the second inductance L2 is 796nH, the third inductance L3 is 27pH, the first total capacitance Cx is C1+ Cp1 is 155.0pF, the second total capacitance Cy is C2+ Cp2 is 5.25fF, and the third total capacitance Cz is C3+ Cp3 is 155.0 pF. Referring to fig. 9, fig. 9 is a frequency response diagram of S12 of the LC band pass filter when a 2.4G Wi-Fi channel is 11 channels according to the present invention.
When the 2.4G Wi-Fi channel is 13 channels, the first inductance L1 is 27pH, the second inductance L2 is 796nH, the third inductance L3 is 27pH, the first total capacitance Cx is C1+ Cp1 is 153.5pF, the second total capacitance Cy is C2+ Cp2 is 5.21fF, and the third total capacitance Cz is C3+ Cp3 is 153.5 pF. Referring to fig. 10, fig. 10 is a frequency response diagram of S12 of the LC band pass filter when a 2.4G Wi-Fi channel is 13 channels according to the present invention.
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 application.
Therefore, the third-order Butterworth LC band-pass filter provided by the invention can adjust the capacitance value of the variable capacitance diode according to the control voltage, further adjust the center frequency of the third-order Butterworth LC band-pass filter, has a simple structure, does not need to be provided with devices with large switch volume and high cost, and is low in cost.
The above-described embodiment takes a third-order butterworth-type LC band-pass filter as an example, and can be extended to other higher-order or lower-order band-pass filters, and the principle is also applicable to other different types of band-pass filters such as a fixed-K type, an m-derived type, a chebyshev type, a bessel type, a gaussian type, an elliptic function type, and an inverse chebyshev type.
As a preferred embodiment, the wireless module 1 is an 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 more pins and can generate a control signal externally, the control module 2 can be integrated into the SoC chip at this time, so that the SoC chip can transmit a first wireless signal and/or receive a second wireless signal filtered by the LC band-pass filter, and can output the control signal 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 working channel of the wireless module 1 and/or there are not enough pins to output the control signal, the additionally added control module 2 outputs the control signal according to the current working 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 operating 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 operating 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 various channels, as shown in fig. 12, and after being filtered by the wireless communication device provided in the present application, a useful WiFi signal is obtained, as shown in fig. 13. On 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, out-of-band noise of other equipment received by the band-pass filter is reduced, the receiving anti-interference capability of the band-pass filter is improved, and the normal work of the wireless communication device is ensured; on the other hand, it can be adapted to a plurality of operating channels of the wireless communication apparatus.
The present invention also provides a wireless communication system, including the above wireless communication apparatus, 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.
For the introduction of the wireless communication system provided by the present invention, please refer to the introduction of the wireless communication apparatus, which is not described herein again.
It is to be noted that, in the present 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. Also, 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 an … …" does not exclude the presence of other identical 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 (10)
1. A wireless communications apparatus, comprising:
the wireless module is used for transmitting a first wireless signal and/or receiving a second wireless signal filtered by a 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.
2. The wireless communication apparatus of claim 1, wherein the band pass filter comprises a varactor-based LC band pass filter, the control signal comprising a control voltage;
the adjusting of the center frequency of the controller according to the control signal includes:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage, and further adjusting the center frequency of the variable capacitance diode.
3. The wireless communication apparatus according to claim 2, wherein the adjusting the capacitance value of the varactor diode according to the control voltage, and further adjusting the center frequency thereof, comprises:
and adjusting the capacitance value of the variable capacitance diode according to the control voltage so as to enable the difference value between the center frequency of the variable capacitance diode and the center frequency of the current working channel to be smaller than a set threshold value.
4. The wireless communication apparatus according to claim 3, wherein the set threshold is 0.
5. The wireless communication apparatus of claim 2, wherein 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 variable capacitance diode comprises a first capacitor, a second capacitor, a third capacitor, a first variable capacitance diode, a second variable capacitance diode, a third variable capacitance diode, 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 variable capacitance diode, one end of the first inductor, the anode of the second variable capacitance diode and one end of the second capacitor, the connected common end is connected with the first control voltage, and the anode of the first variable capacitance diode and the other end of the first inductor are both grounded; the cathode of the second variable capacitance diode is respectively connected with the other end of the second capacitor and one end of the second inductor, and the connected common end is connected with the second control voltage; the other end of the second inductor is connected with the cathode of the third variable capacitance diode, one end of the third capacitor and one end of the third inductor respectively, the connected common end of the second inductor is connected with the third control voltage, and the anode of the third variable capacitance diode, the other end of the third capacitor and the other end of the third inductor are all grounded.
6. The wireless communication apparatus of claim 5, wherein the wireless communication apparatus is a wireless communication apparatus with an operating frequency band of 2.4G;
the value range of the first capacitor and the total capacitance of the first variable capacitance diode is 145-170 pF;
the value range of the second capacitor and the total capacitance of the second variable capacitance diode is 5-5.6 pF;
the value of the total capacitance of the third capacitance and the third varactor is in the range of 145 to 170 pF.
7. The wireless communication apparatus of any of claims 1-6, wherein the wireless module is a SoC chip, and the control module is integrated in the SoC chip.
8. The wireless communication apparatus of any of claims 1-6, wherein the wireless module is a Wi-Fi module or a bluetooth module.
9. The wireless communication apparatus according to any of claims 1-6, wherein the wireless module is a WiFi module without a processor, and the control module is a WiFi Ap chip.
10. A wireless communication system, comprising the wireless communication apparatus according to any one of claims 1 to 9, 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.
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| CN202010223981.1A CN113453346B (en) | 2020-03-26 | 2020-03-26 | Wireless communication device and system |
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| 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 |
| US20100156562A1 (en) * | 2008-12-22 | 2010-06-24 | Electronics And Telecommunications Research Institute | Wideband variable frequency band pass filter |
| 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 |
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| 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 |
| US20100156562A1 (en) * | 2008-12-22 | 2010-06-24 | Electronics And Telecommunications Research Institute | Wideband variable frequency band pass filter |
| 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 |
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| CN113453346B (en) | 2023-04-21 |
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