CN220383052U

CN220383052U - Communication circuit and communication device

Info

Publication number: CN220383052U
Application number: CN202321926623.2U
Authority: CN
Inventors: 赵玉著
Original assignee: Luxshare Precision Technology Nanjing Co Ltd
Current assignee: Luxshare Precision Technology Nanjing Co Ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2024-01-23
Anticipated expiration: 2033-07-20

Abstract

The utility model provides a communication circuit and communication equipment, wherein the communication circuit comprises a WiFi antenna module, an LTE antenna module, a notch module and a low-pass filtering module; the notch module is connected to the WiFi signal receiving branch of the WiFi antenna module; the low-pass filter module is connected to an LTE signal transmitting branch of the LTE antenna module. The LTE antenna module is characterized in that the LTE antenna module is provided with a low-pass filtering module, the LTE antenna module is provided with a notch module, the notch module is arranged on the low-pass filtering module, the LTE antenna module is connected with the WiFi antenna module, and the notch module is connected with the LTE antenna module.

Description

Communication circuit and communication device

Technical Field

The present utility model relates to the field of communications, and in particular, to a communication circuit and a communication device.

Background

Communication terminals in the field of private network communication mostly use the form of an ad hoc network private network frequency band +WIFI of an LTE system; when the used LTE frequency band is 566-678 MHz frequency band, 4 times harmonic (2264-2712 MHz) of the LTE frequency band just falls in a passband (2400-2483.5 MHz) of 2.4GHz WIFI, and at the moment, an LTE main frequency signal and 4 times harmonic signals of the LTE main frequency signal are coupled to a receiving and transmitting path of the WIFI through an LTE antenna, so that a receiver of the WIFI is saturated, blocked and in-band wound, error codes are generated, and the throughput rate and coverage performance of the WIFI are seriously affected.

Disclosure of Invention

The utility model mainly aims to provide a communication circuit and communication equipment, and aims to solve the problem that WiFi performance is affected by coupling of LTE signals to a WiFi receiving and transmitting path in the prior art.

In order to achieve the above object, the present utility model provides a communication circuit, which includes a WiFi antenna module, an LTE antenna module, a notch module, and a low-pass filter module; the notch module is connected to a WiFi signal receiving branch of the WiFi antenna module; the low-pass filtering module is connected to an LTE signal transmitting branch of the LTE antenna module, wherein:

the low-pass filtering module is used for filtering high-frequency harmonic signals in LTE output signals of the LTE antenna module, wherein resonance points of the low-pass filtering module are matched with fundamental frequencies of the LTE output signals;

the notch module is used for filtering the LTE output signal in the WiFi receiving signal of the WiFi antenna module, wherein the resonance point of the notch module is matched with the fundamental frequency of the LTE output signal.

Optionally, the notch module includes a first inductor, a first capacitor, a second capacitor, and a third capacitor; wherein:

the first capacitor and the second capacitor are connected in series on a WiFi signal receiving branch of the WiFi antenna module, a first end of the third capacitor is connected between the first capacitor and the second capacitor, and a second end of the third capacitor is grounded through the first inductor.

Optionally, the low-pass filtering module includes a second inductor, a fourth capacitor and a fifth capacitor; wherein:

the second inductor is connected in series to the LTE signal transmitting branch of the LTE antenna module, the first end of the second inductor is grounded through the fourth capacitor, and the second end of the second inductor is grounded through the fifth capacitor.

Optionally, the WiFi antenna module includes a WiFi signal processing unit, a WiFi signal receiving branch, and a WiFi antenna; wherein:

and the WiFi signal processing unit is connected with the WiFi antenna through the WiFi signal receiving branch.

Optionally, the LTE antenna module includes an LTE signal processing unit, a branch selection unit, an LTE signal receiving branch, an LTE signal transmitting branch, and an LTE antenna; the signal end of the LTE signal processing unit is connected with the LTE antenna through the LTE signal receiving branch and the LTE signal transmitting branch respectively, and the branch selecting unit is arranged on the LTE signal receiving branch and the LTE signal transmitting branch; wherein:

the branch selection unit is configured to access the LTE signal receiving branch or the LTE signal transmitting branch to between the LTE signal processing unit and the LTE antenna.

Optionally, the LTE signal transmission branch includes a power amplifier; wherein:

the input end of the power amplifier is connected with the signal end of the LTE signal processing unit, and the output end of the power amplifier is connected with the LTE antenna through the low-pass filter module.

Optionally, the LTE signal receiving branch includes a low noise amplifier and a surface acoustic wave filter; wherein:

the input end of the low noise amplifier is connected with the LTE antenna, and the output end of the low noise amplifier is connected with the signal end of the LTE signal processing unit through the surface acoustic wave filter.

Optionally, the branch selection unit includes a first single-pole double-throw switch and a second single-pole double-throw switch; wherein:

the movable contact of the first single-pole double-throw switch is connected with the signal end of the LTE signal processing unit, the first fixed contact of the first single-pole double-throw switch is connected with the first fixed contact of the second single-pole double-throw switch through the LTE signal receiving branch, the second fixed contact of the first single-pole double-throw switch is connected with the second fixed contact of the second single-pole double-throw switch through the LTE signal transmitting branch, and the movable contact of the second single-pole double-throw switch is connected with the LTE antenna; the control end of the first single-pole double-throw switch is connected with the control signal output end of the LTE signal processing unit, and the control end of the second single-pole double-throw switch is connected with the control signal output end of the LTE signal processing unit; wherein:

the contact connection state of the first single-pole double-throw switch is consistent with that of the second single-pole double-throw switch.

Optionally, the fundamental frequency of the LTE output signal is 600MHz, and the fundamental frequency of the WiFi receive signal is 2.4GHz.

In addition, in order to achieve the above object, the present utility model also provides a communication apparatus including a housing and the communication circuit as described above, the communication circuit being provided in the housing.

The utility model provides a communication circuit and communication equipment, wherein the communication circuit comprises a WiFi antenna module, an LTE antenna module, a notch module and a low-pass filtering module; the notch module is connected to a WiFi signal receiving branch of the WiFi antenna module; the low-pass filtering module is connected to an LTE signal transmitting branch of the LTE antenna module, wherein: the low-pass filtering module is used for filtering high-frequency harmonic signals in LTE output signals of the LTE antenna module, wherein resonance points of the low-pass filtering module are matched with fundamental frequencies of the LTE output signals; the notch module is used for filtering the LTE output signal in the WiFi receiving signal of the WiFi antenna module, wherein the resonance point of the notch module is matched with the fundamental frequency of the LTE output signal. The LTE antenna module is characterized in that the LTE antenna module is provided with a low-pass filtering module, the LTE antenna module is provided with a notch module, the notch module is arranged on the low-pass filtering module, the LTE antenna module is connected with the WiFi antenna module, and the notch module is connected with the LTE antenna module.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a functional block diagram of an embodiment of a communication circuit according to the present utility model;

FIG. 2 is a circuit diagram of a communication circuit according to the present utility model applied to the embodiment of FIG. 1;

fig. 3 is a schematic diagram of a frequency response curve of an LTE antenna module in the communication circuit of the present utility model;

fig. 4 is a schematic diagram of a frequency response curve of a WiFi antenna module in the communication circuit of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	WiFi antenna module	ANT1	WiFi antenna
110	WiFi signal processing unit	ANT2	LTE antenna
				200	LTE antenna module	SPDT1	First single pole double throw switch
210	LTE signal processing unit	SPDT2	Second single pole double throw switch
				300	Notch module	SAW	Surface acoustic wave filter
400	Low-pass filtering module	LNA	Low noise amplifier
				PA	Power amplifier	I1	600M radio frequency signal terminal
L1～L2	First to second inductors	I2	2.4G radio frequency signal terminal
				C1～C5	First to fifth capacitors

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present utility model) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a communication circuit, which is applied to communication equipment, wherein the communication equipment can be a mobile phone, a tablet, a wearable device and the like, please refer to fig. 1, and fig. 1 is a functional block diagram of an embodiment of the communication circuit. In this embodiment, the communication circuit includes a WiFi antenna module 100, an LTE antenna module 200, a notch module 300, and a low-pass filtering module 400; the notch module 300 is connected to the WiFi signal receiving branch of the WiFi antenna module 100; the low-pass filtering module 400 is connected to an LTE signal transmitting branch of the LTE antenna module 200, wherein:

the low-pass filtering module 400 is configured to filter a high-frequency harmonic signal in an LTE output signal of the LTE antenna module 200, where a resonance point of the low-pass filtering module 400 is matched with a fundamental frequency of the LTE output signal;

and the notch module 300 is configured to filter the LTE output signal in the WiFi received signal of the WiFi antenna module 100, where a resonance point of the notch module 300 is matched with a fundamental frequency of the LTE output signal.

The low-pass filter module 400 has higher impedance for signals with frequency greater than the resonance point and lower impedance for signals with frequency less than the resonance point, so that signals with frequency less than the resonance point can be output through the low-pass filter module 400, while signals with frequency greater than the resonance point cannot pass through the low-pass filter module 400; it can be understood that the high-frequency harmonic signal generated by the LTE module is multiple harmonics of the fundamental frequency, that is, the frequency of the high-frequency harmonic signal is an integer multiple of the fundamental frequency greater than 1, and because the resonance point of the low-pass filter module 400 is matched with the fundamental frequency of the LTE output signal, the frequency of the high-frequency harmonic signal is necessarily greater than the resonance point of the low-pass filter module 400, the high-frequency harmonic signal cannot pass through the low-pass filter module 400, and the low-pass filter module 400 can effectively filter the high-frequency harmonic signal, thereby reducing the interference degree of the WiFi module by the high-frequency harmonic signal.

The notch module 300 has a higher impedance for signals having frequencies near the resonance point and a lower impedance for signals having frequencies that differ greatly from the resonance point, so that signals having frequencies that differ greatly from the resonance point can be input through the notch module 300, while signals having frequencies near the resonance point cannot pass through the notch module 300; the resonance point of the notch module 300 is matched with the fundamental frequency of the LTE output signal, so that the LTE output signal is filtered by the notch module 300, and the problem that the LTE antenna signal is saturated and blocked to the receiver of the WiFi antenna module 100 is avoided.

If the LTE output signal is 600M signal and the WiFi receiving signal is 2.4GHz signal, the fundamental frequency corresponding to the LTE output signal is 566-678 MHz, and the frequency corresponding to the 4 th harmonic is

2264-2712 MHz, at this time, the resonance point of the low-pass filtering module 400 is matched with the fundamental frequency of the LTE output signal, so that the fundamental wave of the LTE output signal can be normally output through the antenna, while the 4 th harmonic wave is filtered by the low-pass filtering module 400 and cannot be output; when the fundamental wave of the LTE output signal is coupled to the WiFi module, since the resonance point of the notch module 300 is matched with the fundamental frequency of the LTE output signal, the fundamental wave of the LTE output signal is filtered by the notch module 300, and since the 2.4GHz WiFi receiving signal can be smoothly input through the notch module 300.

The low-pass filtering module 400 is arranged to filter out high-frequency harmonic signals generated in the LTE antenna module 200, so that interference of the high-frequency harmonic signals to the WiFi antenna module 100 is avoided, meanwhile, the notch module 300 is arranged to filter out LTE antenna signals coupled to the WiFi antenna module 100, so that the problem of saturation and blockage of a receiver of the WiFi antenna module 100 caused by the fact that the LTE antenna signals enter the WiFi antenna module 100 is avoided, and the working performance of the WiFi antenna module 100 is guaranteed when the LTE antenna module 200 and the WiFi antenna module 100 are simultaneously arranged.

Further, referring to fig. 2, the notch module 300 includes a first inductor L1, a first capacitor C1, a second capacitor C2, and a third capacitor C3; wherein:

the first capacitor C1 and the second capacitor C2 are connected in series on the WiFi signal receiving branch of the WiFi antenna module 100, the first end of the third capacitor C3 is connected between the first capacitor C1 and the second capacitor C2, and the second end of the third capacitor C3 is grounded through the first inductor L1.

The first inductor L1, the first capacitor C1, the second capacitor C2, and the third capacitor C3 form a notch module 300; it can be appreciated that the resonance point of the notch module 300 may be determined by the inductance value of the first inductor L1, the capacitance values of the first capacitor C1, the second capacitor C2 and the third capacitor C3, and the specific setting mode may be selected based on the actual application scenario, which is not described herein.

The resonance point of the notch module 300 is matched with the fundamental frequency of the LTE signal, so that the impedance of the notch module 300 to the ground of the fundamental wave of the LTE signal is small and is close to 0 impedance, and therefore the fundamental wave of the LTE signal is transmitted to the ground through the third capacitor C3 and the first inductor L1, and the fundamental wave of the LTE signal is filtered; and the frequency of the 2.4GHz WiFi reception signal is greatly different from the resonance point of the notch module 300, so that the notch module 300 has a large impedance to ground for the 2.4GHz WiFi reception signal, and the impedance is infinite, and the 2.4GHz WiFi reception signal is input to the signal processing device of the WiFi antenna module 100.

Further, the low-pass filtering module 400 includes a second inductor L2, a fourth capacitor C4, and a fifth capacitor C5; wherein:

the second inductor L2 is connected in series to the LTE signal transmitting branch of the LTE antenna module 200, where a first end of the second inductor L2 is grounded through a fourth capacitor C4, and a second end of the second inductor L2 is grounded through a fifth capacitor C5.

The second inductor L2, the fourth capacitor C4, and the fifth capacitor C5 form a low-pass filter module 400; it can be appreciated that the resonance point of the low-pass filtering module 400 can be determined by the inductance value of the second inductor L2, the capacitance values of the fourth capacitor C4 and the fifth capacitor C5, and the specific setting mode can be selected based on the actual application scenario, which is not described herein.

The resonance point of the low-pass filter module 400 is matched with the fundamental frequency of the LTE signal, so that the impedance of the low-pass filter module 400 to the ground of the fundamental wave of the LTE signal is large, and the fundamental wave of the LTE signal can be output through the low-pass filter module 400; the harmonic frequency of the LTE signal is far higher than the resonance point of the low-pass filter module 400, the low-pass filter module 400 has small impedance to ground for the harmonic of the LTE signal, and the harmonic of the LTE signal is transmitted to ground through the fourth capacitor C4 and the fifth capacitor C5, so that the harmonic of the LTE signal is filtered.

Further, the WiFi antenna module 100 includes a WiFi signal processing unit 110, a WiFi signal receiving branch, and a WiFi antenna ANT1; wherein:

the WiFi signal processing unit 110 is connected to the WiFi antenna ANT1 through a WiFi signal receiving branch.

Specifically, the WiFi antenna module 100 further includes: 2.4G radio frequency signal terminal I2; the WiFi signal receiving branch is connected with a 2.4G radio frequency signal end I2, the 2.4G radio frequency signal end I2 is connected with a WiFi antenna ANT1, and the 2.4G radio frequency signal end I2 is also grounded; wherein, the 2.4G radio frequency signal end I2 is a radio frequency connector or an antenna shrapnel.

The WiFi antenna ANT1 is used for receiving the WiFi signal to obtain a WiFi receiving signal, the WiFi signal receiving branch is used for transmitting the WiFi receiving signal to the WiFi signal processing unit 110, and the WiFi signal processing unit 110 is used for performing signal processing on the WiFi receiving signal; the WiFi signal processing unit 110 may be set based on practical application requirements, for example, the WiFi signal processing unit 110 may include a low noise amplifier LNA and a receiver.

Further, the LTE antenna module 200 includes an LTE signal processing unit 210, a branch selection unit, an LTE signal receiving branch, an LTE signal transmitting branch, and an LTE antenna ANT2; the signal end of the LTE signal processing unit 210 is connected to the LTE antenna ANT2 through an LTE signal receiving branch and an LTE signal transmitting branch, respectively, and the branch selecting unit is disposed on the LTE signal receiving branch and the LTE signal transmitting branch; wherein:

the branch selection unit is configured to access the LTE signal receiving branch or the LTE signal transmitting branch between the LTE signal processing unit 210 and the LTE antenna ANT2.

Specifically, the LTE antenna module 200 further includes a 600M radio frequency signal end I1, the LTE signal receiving branch is connected to the 600M radio frequency signal end I1, the 600M radio frequency signal end I1 is connected to the LTE antenna ANT2, and the 600M radio frequency signal end I1 is further grounded; the 600M radio frequency signal end I1 is a radio frequency connector or an antenna shrapnel.

The LTE signal processing unit 210 is configured to output an LTE output signal to the LTE antenna ANT2 through the LTE signal transmitting branch when the branch selecting unit inserts the LTE signal transmitting branch between the LTE signal processing unit 210 and the LTE antenna ANT2;

the LTE signal processing unit 210 is further configured to receive, through the LTE signal receiving branch, the LTE reception signal output by the LTE antenna ANT2 when the branch selecting unit inserts the LTE signal receiving branch between the LTE signal processing unit 210 and the LTE antenna ANT2.

It can be appreciated that only one of the LTE signal receiving branch and the LTE signal transmitting branch is connected between the LTE signal processing unit 210 and the LTE antenna ANT2 at the same time.

In addition to the LTE signal transmitting branch, the LTE antenna module 200 is further provided with an LTE signal receiving branch, where in this embodiment, the low-pass filter module 400 is connected to the LTE signal transmitting branch, when the LTE signal transmitting branch works, the low-pass filter module 400 implements a filtering function, and when the LTE signal receiving branch works, the low-pass filter module is disconnected along with the LTE signal transmitting branch, and the LTE signal receiving branch is not affected by the low-pass filter module 400; compared with the mode of directly arranging the low-pass filtering module 400 on the line where the LTE antenna is arranged, the insertion loss of the LTE signal receiving branch is reduced, and the receiving sensitivity of the LTE signal receiving branch is ensured.

Further, the LTE signal transmitting branch includes a power amplifier PA; wherein:

the input end of the power amplifier PA is connected to the signal end of the LTE signal processing unit 210, and the output end of the power amplifier PA is connected to the LTE antenna ANT2 through the low-pass filter module 400.

The power amplifier PA amplifies the power of the LTE output signal output by the LTE signal processing unit 210, and outputs the power to the LTE antenna ANT2 through the low-pass filter module 400.

It should be noted that, the LTE signal processing unit 210 and the WiFi signal processing unit 110 may also be connected through communication between the serial port UART and the network port LAN, so as to implement signal transmission between the two.

Further, the LTE signal receiving branch includes a low noise amplifier LNA and a surface acoustic wave filter SAW; wherein:

the input end of the low noise amplifier LNA is connected to the LTE antenna ANT2, and the output end of the low noise amplifier LNA is connected to the signal end of the LTE signal processing unit 210 through the surface acoustic wave filter SAW.

The LTE antenna ANT2 outputs an LTE reception signal to the low noise amplifier LNA, amplifies the LTE reception signal, filters the LTE reception signal by the surface acoustic wave filter SAW, and outputs the filtered signal to the LTE signal processing unit 210.

Further, the branch selection unit comprises a first single-pole double-throw switch SPDT1 and a second single-pole double-throw switch SPDT2; wherein:

the movable contact of the first single-pole double-throw switch SPDT1 is connected with the signal end of the LTE signal processing unit 210, the first fixed contact of the first single-pole double-throw switch SPDT1 is connected with the first fixed contact of the second single-pole double-throw switch SPDT2 through an LTE signal receiving branch, the second fixed contact of the first single-pole double-throw switch SPDT1 is connected with the second fixed contact of the second single-pole double-throw switch SPDT2 through an LTE signal transmitting branch, and the movable contact of the second single-pole double-throw switch SPDT2 is connected with the LTE antenna ANT2; the control end of the first single-pole double-throw switch SPDT1 is connected with the control signal output end of the LTE signal processing unit 210, and the control end of the second single-pole double-throw switch SPDT2 is connected with the control signal output end of the LTE signal processing unit 210; wherein:

the contact connection states of the first single-pole double-throw switch SPDT1 and the second single-pole double-throw switch SPDT2 are consistent.

Specifically, the GPIO port of the LTE signal processing unit 210 is connected to the control terminal of the first single pole double throw switch SPDT1 and the control terminal of the second single pole double throw switch SPDT 2.

The LTE signal processing unit 210 outputs the same control signal to the first single pole double throw switch SPDT1 and the second single pole double throw switch SPDT2; namely, when the movable contact of the first single-pole double-throw switch SPDT1 is connected with the first stationary contact, the movable contact of the second single-pole double-throw switch SPDT2 is connected with the first stationary contact, and at this time, the LTE signal receiving branch is connected between the LTE signal processing unit 210 and the LTE antenna ANT2; when the movable contact of the first single-pole double-throw switch SPDT1 is connected to the second stationary contact, the movable contact of the second single-pole double-throw switch SPDT2 is connected to the second stationary contact, and at this time, the LTE signal transmitting branch is connected between the LTE signal processing unit 210 and the LTE antenna ANT2.

It should be noted that, in other embodiments, the branch selection unit may be disposed only at one end of the LTE signal receiving branch and the LTE signal transmitting branch, for example, only the first single pole double throw switch or only the second single pole double throw switch is disposed.

Referring to fig. 3, fig. 3 is a schematic diagram of a frequency response curve of an LTE antenna module 200 in the communication circuit of the present utility model; as can be seen from fig. 3, for the 4 th harmonic signal attenuation of 600M frequency band-32.9 dB (point M3 in the figure), the insertion loss of 600M frequency band is less than 0.1dB (points M1 and M2 in the figure), and the power of 600M frequency band is generally about 33dBm, and the antenna isolation is generally 18-20 dB; the WIFI antenna module 100 has the signal strength requirement of less than-50 dB for the same-frequency interference, so that the 2.4GHz frequency band can not be subjected to the same-frequency interference of the 600M frequency band 4-order harmonic signal; in the communication circuit, the coupling strength of 2.4 GHz= (600M frequency band 4 th harmonic signal strength) - (antenna isolation) - (attenuation of 4 th harmonic signal) - (SAW insertion loss inside a WIFI module) = -20-20-32.9-0.1= -73dB, and the coupling strength is smaller than-50 dB required by the WIFI antenna module 100, so that the wireless performance and coverage performance of 600M frequency band 4 th harmonic interference of 2.4GHz frequency band can be solved.

Referring to fig. 4, fig. 4 is a schematic diagram of a frequency response curve of the WiFi antenna module 100 in the communication circuit according to the present utility model; as can be seen from fig. 4, for the signal attenuation of the fundamental wave in the 600M frequency band < -30dB (M1, M2, M3 points in the figure), and the insertion loss in the 2.4G frequency band is less than 0.1dB (M4 and M5 points in the figure), the signal strength requirement of the WIFI antenna module 100 for the coupling of the 600M frequency band signal to the 2.4GHz frequency band is less than-30 dB, so that the 2.4GHz frequency band signal cannot be interfered by the non-same frequency of the 600M frequency band signal, in the communication circuit of the present utility model, the coupling strength of 2.4 ghz= (600M signal strength) - (antenna isolation) - (signal attenuation of the fundamental wave in the 600M frequency band) - (SAW insertion loss inside the WIFI module) = 33-20-30-30= -47dB, and the coupling strength is less than-30 dB required by the WIFI antenna module 100, so that the wireless performance and coverage performance of the 600M frequency band interference 2.4GHz frequency band can be solved; meanwhile, the components in the communication circuit adopt discrete capacitors and inductors, so that the cost is very low, the suppression degree can be properly adjusted according to the interference degree of the product, and the wireless throughput rate and coverage performance of the product during double-frequency operation are ensured.

The utility model also provides a communication device, which comprises a shell and a communication circuit, wherein the communication circuit is arranged in the shell, and the structure of the communication circuit can refer to the embodiment and is not repeated herein. It should be noted that, since the communication device of the present embodiment adopts the technical solution of the above-described communication circuit, the communication device has all the advantageous effects of the above-described communication circuit.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. 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 system that comprises the element. The foregoing embodiment numbers of the present utility model are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims

1. The communication circuit is characterized by comprising a WiFi antenna module, an LTE antenna module, a notch module and a low-pass filtering module; the notch module is connected to a WiFi signal receiving branch of the WiFi antenna module; the low-pass filtering module is connected to an LTE signal transmitting branch of the LTE antenna module, wherein:

2. The communication circuit of claim 1, wherein the notch module comprises a first inductance, a first capacitance, a second capacitance, and a third capacitance; wherein:

3. The communication circuit of claim 1, wherein the low pass filter module comprises a second inductor, a fourth capacitor, and a fifth capacitor; wherein:

4. The communication circuit of claim 1, wherein the WiFi antenna module comprises a WiFi signal processing unit, a WiFi signal receiving branch, and a WiFi antenna; wherein:

5. The communication circuit of claim 1, wherein the LTE antenna module comprises an LTE signal processing unit, a leg selection unit, an LTE signal receiving leg, an LTE signal transmitting leg, and an LTE antenna; the signal end of the LTE signal processing unit is connected with the LTE antenna through the LTE signal receiving branch and the LTE signal transmitting branch respectively, and the branch selecting unit is arranged on the LTE signal receiving branch and the LTE signal transmitting branch; wherein:

6. The communication circuit of claim 5, wherein the LTE signal transmitting branch comprises a power amplifier; wherein:

7. The communication circuit of claim 5, wherein the LTE signal receiving branch includes a low noise amplifier and a surface acoustic wave filter; wherein:

8. The communication circuit of claim 5, wherein the branch selection unit comprises a first single pole double throw switch and a second single pole double throw switch; wherein:

9. The communication circuit according to any one of claims 1 to 8, wherein a fundamental frequency of the LTE output signal is 600MHz and a fundamental frequency of the WiFi reception signal is 2.4GHz.

10. A communication device comprising a housing and a communication circuit according to any one of claims 1 to 9, the communication circuit being arranged within the housing.