CN112468094A - Antenna receiving system and electronic equipment - Google Patents
Antenna receiving system and electronic equipment Download PDFInfo
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- CN112468094A CN112468094A CN202011262491.9A CN202011262491A CN112468094A CN 112468094 A CN112468094 A CN 112468094A CN 202011262491 A CN202011262491 A CN 202011262491A CN 112468094 A CN112468094 A CN 112468094A
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- H—ELECTRICITY
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- H03F—AMPLIFIERS
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- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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Abstract
The embodiment of the application discloses an antenna receiving system and electronic equipment, wherein the system comprises an antenna, a filter, a low-noise amplifier, a transmission line and a wireless module; the antenna is used for receiving electromagnetic waves and converting the electromagnetic waves into antenna signals; the filter is used for receiving the antenna signal and filtering the antenna signal to obtain a filtered signal, and outputting the filtered signal to the low noise amplifier; the low-noise amplifier is used for amplifying the filtering signal to obtain an amplified signal and outputting the amplified signal through the transmission line; the transmission line is used for transmitting the amplified signal to the wireless module. Therefore, by disposing the low noise amplifier in front of the transmission line, it is possible to reduce the loss of the amplified signal on the transmission line, and at the same time, to prevent the noise of the transmission line from being amplified by the low noise amplifier, thereby reducing the interference noise of the antenna receiving system and increasing the sensitivity.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to an antenna receiving system and an electronic device.
Background
In the antenna signal receiving circuit, an antenna signal is received through an antenna, an unwanted signal is filtered by a filter, and then the antenna signal is transmitted to a Low Noise Amplifier (LNA) through a transmission line for Low Noise amplification, and then the antenna signal is transmitted to a wireless module for demodulation and subsequent processing.
In the process of transmitting the filtered antenna signal to the low noise amplifier through the transmission line, the weak antenna signal is seriously lost on the transmission line. In addition, when the low noise amplifier amplifies the antenna signal with low noise, the noise of the transmission line is also amplified by the low noise amplifier, which increases the interference noise of the antenna reception system and deteriorates the sensitivity.
Disclosure of Invention
The embodiment of the application provides an antenna receiving system and electronic equipment, can reduce the loss of antenna signal on the transmission line, reduce the noise interference of transmission line simultaneously to make the interference noise of antenna receiving system reduce, sensitivity uprises. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an antenna receiving system, which includes an antenna, a filter, a low noise amplifier, a transmission line, and a wireless module, where:
the antenna is used for receiving electromagnetic waves and converting the electromagnetic waves into antenna signals;
the filter is respectively connected with the antenna and the low noise amplifier, and is used for receiving the antenna signal, filtering the antenna signal to obtain a filtered signal, and outputting the filtered signal to the low noise amplifier;
the low-noise amplifier is connected with the transmission line and used for amplifying the filtering signal to obtain an amplified signal and outputting the amplified signal through the transmission line;
the transmission line is connected with the wireless module and used for transmitting the amplified signal to the wireless module.
In a second aspect, an embodiment of the present application provides an electronic device, which includes the above antenna receiving system, where the antenna receiving system is disposed in the electronic device.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
in one or more embodiments of the present application, an antenna is connected to a filter, the filter is connected to a low noise amplifier, the low noise amplifier is connected to a transmission line, and the transmission line is connected to a wireless module, so as to form an antenna receiving system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an antenna receiving system according to an embodiment of the present application;
fig. 2 is an exemplary schematic diagram of an antenna receiving system according to an embodiment of the present application;
fig. 3 is an exemplary schematic diagram of a conventional antenna receiving system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another antenna receiving system provided in the embodiment of the present application;
FIG. 5 is a circuit diagram of a first circuit according to an embodiment of the present disclosure;
FIG. 6 is a circuit diagram of another first circuit topology provided by an embodiment of the present application;
FIG. 7 is a circuit diagram of a second circuit according to an embodiment of the present disclosure;
fig. 8 is a topological circuit diagram of a transmission line multiplexing circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
In the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present application, it is noted that, unless explicitly stated or limited otherwise, "including" and "having" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The present application will be described in detail with reference to specific examples.
In one embodiment, as shown in fig. 1, an antenna receiving system is proposed, where the antenna receiving system 1 includes an antenna 11, a filter 12, a low noise amplifier 13, a transmission line 14, and a wireless module 15, where:
an antenna 11 for receiving electromagnetic waves and converting the electromagnetic waves into antenna signals;
the filter 12 is connected to the antenna 11 and the low noise amplifier 13, and configured to receive the antenna signal, perform filtering processing on the antenna signal, obtain a filtered signal, and output the filtered signal to the low noise amplifier 13;
the low-noise amplifier 13 is connected with the transmission line 14 and is used for amplifying the filtered signal to obtain an amplified signal and outputting the amplified signal through the transmission line 14;
and a transmission line 14 connected to the wireless module 15 for transmitting the amplified signal to the wireless module 15.
The low noise amplifier is a small signal amplifier with excellent noise characteristics and high gain, and includes, but is not limited to, any one of a low temperature refrigeration parametric amplifier, a normal temperature and constant temperature parametric amplifier, a microwave field effect transistor amplifier, and a high electron mobility transistor amplifier.
The transmission line is a wave guide structure for transmitting computer or electric signals in a transverse electromagnetic mode and at least comprises one of a strip line, a coaxial line, a twisted pair line and a triaxial line.
Specifically, the relationship function between the sensitivity and the noise coefficient of the antenna receiving system is as follows:
S＝-174dBm+10lg(BW)+Eb/N0+NF
wherein dBm represents the power of the antenna signal, BW represents the bandwidth of the antenna signal, EbIs the power of the filtered signal, N0Representing the power spectral density, E, of the noise in the low noise amplifier 13b/N0The signal-to-noise ratio of the low noise amplifier 13 is indicated and NF the noise figure of the antenna reception system 1.
The bandwidth of the antenna signal refers to a frequency range occupied by different frequency components contained in the antenna signal. The Power Spectral Density (PSD) of noise refers to the Power carried by a unit frequency wave obtained by multiplying the Power Spectral Density of a noise sound wave by an appropriate coefficient, i.e., the Power Spectral Density of noise. The snr refers to the ratio of the signal to the noise in an electronic device or system, and in this embodiment, the snr of the lna 13 refers to the ratio of the power of the filtered signal received by the lna 13 to the power spectral density of the noise in the lna. The Noise Figure (NF) is a measure of the magnitude of the noise within the circuit or system, and the noise figure of the antenna reception system 1 is a measure of the magnitude of the noise within the antenna reception system.
In summary, it can be seen that the noise factor NF is smaller, the sensitivity S of the antenna receiving system is smaller, and the absolute value of the sensitivity S is larger when the sensitivity S is a negative value, that is, the smaller the noise factor is, the higher the sensitivity of the antenna receiving system is.
The magnitude of the Noise Factor is determined by the Noise Factor (Noise Factor, F), and the relationship between the Noise Factor NF and the Noise Factor F is as follows:
NF＝10lg(F)
wherein F represents the noise factor, and if the noise factor F becomes smaller, the noise factor NF becomes smaller, and the absolute value of the sensitivity S of the antenna receiving system becomes larger.
It should be noted that the noise factor F is a ratio of an input signal-to-noise ratio to an output signal-to-noise ratio in the antenna receiving system. Noise factor F in the present embodiment1The calculation formula of (a) is as follows:
where Si denotes the power of the antenna signal, Ni denotes the power of the input noise, G denotes the gain coefficient of the low noise amplifier, β denotes the attenuation coefficient of the transmission line, Ne denotes the power of the low noise amplifier output noise, and Nc denotes the power of the transmission line output noise.
As shown in fig. 2, an exemplary schematic diagram of an antenna receiving system in this embodiment is shown, in which the antenna receiving system 1 in this embodiment includes an antenna 11, a filter 12, a low noise amplifier 13, a transmission line 14, and a wireless module 15. As shown in fig. 3, an exemplary schematic diagram of an antenna receiving system in the prior art, an antenna receiving system 2 in the prior art includes an antenna 21, a filter 22, a transmission line 23, a low noise amplifier 24, and a wireless module 25, where:
the antenna 21, the filter 22, the transmission line 23, the low noise amplifier 24, and the wireless module 25 are connected in sequence to receive an antenna signal.
In the case where the antenna reception system 1 and the antenna reception system 2 have the same types and parameters of elements and the same received electromagnetic waves, the conventional antenna reception system has the same type and parameters of elements and the same received electromagnetic wavesNoise factor F in the art2The calculation formula of (a) is as follows:
noise factor F in the present embodiment1Is compared with the noise factor F in the prior art2Is distinguished by Ne · β + Nc and Ne + Nc · G, where the gain coefficient G of the low noise amplifier is greater than 1 and the attenuation coefficient β of the transmission line is less than 1, and therefore, the noise factor F is smaller in the present embodiment1Less than the noise factor F of the prior art2。
The noise factor NF is obtained from a function of a relationship between the noise factor F and the noise factor NF, and compared with the prior art, the noise factor of the antenna receiving system in the present embodiment is smaller and the sensitivity is higher. Meanwhile, the low-noise amplifier receives the filtering signal, performs low-noise amplification, and outputs the signal through the transmission line, so that the loss of the antenna signal on the transmission line can be compensated.
In this application embodiment, connect the antenna with the filter, the filter is connected with the low noise amplifier, the low noise amplifier is connected with the transmission line, the transmission line is connected with wireless module, constitute antenna receiving system, compared with prior art, can be through setting up the low noise amplifier before the transmission line for the filtering signal carries out low noise amplification via the low noise amplifier, again via transmission line transmission, thereby can reduce the loss of amplifying signal on the transmission line, avoid the noise of transmission line to be amplified by the low noise amplifier simultaneously, and then make antenna receiving system's interference noise reduce, sensitivity uprises.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of an antenna receiving system according to the present application. The antenna receiving system 1 includes the antenna 11, the filter 12, the low noise amplifier 13, the transmission line 14, and the wireless module 15 in the first embodiment, and in this embodiment, the antenna receiving system 1 further includes a transmission line multiplexing circuit 16, where:
the connection relationship between the antenna 11, the filter 12, the low noise amplifier 13, the transmission line 14 and the wireless module 15 is the same as that of the first embodiment, and reference may be made to the first embodiment for details, which are not described herein again.
The transmission line multiplexing circuit 16 includes a first circuit 161 and a second circuit 162, in which:
as shown in fig. 5, the first circuit 162 includes a first inductor L1A second inductor L2And a transmission line 14. First inductance L1Is connected to the power supply terminal of the wireless module 15, a first inductance L1And the other end of which is connected to one end of the transmission line 14; second inductance L2Is connected to the other end of the transmission line 14, a second inductance L2And the other end thereof is connected to a power supply terminal of the low noise amplifier 13 for blocking the antenna signal and supplying a dc power to the low noise amplifier 13.
Optionally, as shown in fig. 6, the first circuit further includes a first capacitor C1. A first capacitor C1One end of and the second inductance L2Is connected to the other end of the first capacitor C1And the other end of which is connected to one end of a low noise amplifier 13 for decoupling the first circuit.
The decoupling means that parasitic coupling between the circuit networks is eliminated, and the influence of current impact formed in the power supply circuit due to the change of the current of the front and rear circuit networks on the normal operation of the network can be eliminated.
As shown in FIG. 7, the second circuit includes a second capacitor C2A third capacitor C3And a transmission line 14. Second capacitor C2Is connected to the other end of the low noise amplifier 13, and a second capacitor C2And the other end of the transmission line 14 and the second inductor C, respectively2One end of the two ends are connected; third capacitor C3One end of which is connected to one end of the transmission line 14 and the first inductor L, respectively1Is connected to the other end of the third capacitor C3And the other end of the same is connected to the input end of the wireless module 15, for blocking the dc power supply and transmitting the antenna signal.
Optionally, as shown in fig. 8, the transmission line multiplexing circuit 16 further includes a grounding circuit 163, and the grounding circuit 163 is connected to the low noise amplifier 13 and the transmission line 14, respectively, and is configured to ground the low noise amplifier 13 and the transmission line 14.
In the embodiment of the application, the antenna is connected with the filter, the filter is connected with the low-noise amplifier, the low-noise amplifier is connected with the transmission line, the transmission line is connected with the wireless module, and the transmission line multiplexing circuit is respectively connected with the low-noise amplifier and the wireless module to form the antenna receiving system, so that the power end of the low-noise amplifier is connected with the power end of the wireless module by adding the transmission line multiplexing circuit under the condition of not influencing the signal transmission of the antenna, thereby providing a direct-current power supply for the low-noise amplifier, avoiding adding an extra direct-current connecting wire for the low-noise amplifier, and reducing the complexity of the antenna receiving system.
An embodiment of the present application further provides an electronic device, which includes the above antenna receiving system, where the antenna receiving system is disposed in the electronic device. The electronic device can be a smart phone, a tablet computer, a tracker and the like. The electronic equipment with the antenna receiving system can reduce the loss of the amplified signal on the transmission line and reduce the noise interference of the transmission line, thereby reducing the interference noise of the antenna receiving system and increasing the sensitivity. Furthermore, the electronic device with the antenna receiving system can be further provided with a transmission line multiplexing circuit, so that the power end of the low-noise amplifier is connected with the power end of the wireless module under the condition that the transmission of antenna signals is not influenced, a direct-current power supply is provided for the low-noise amplifier, an additional direct-current connecting line is prevented from being added for the low-noise amplifier, and the complexity of the antenna receiving system is reduced.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.
Claims (10)
1. An antenna receiving system comprising an antenna, a filter, a low noise amplifier, a transmission line, and a radio module, wherein:
the antenna is used for receiving electromagnetic waves and converting the electromagnetic waves into antenna signals;
the filter is respectively connected with the antenna and the low noise amplifier, and is used for receiving the antenna signal, filtering the antenna signal to obtain a filtered signal, and outputting the filtered signal to the low noise amplifier;
the low-noise amplifier is connected with the transmission line and used for amplifying the filtering signal to obtain an amplified signal and outputting the amplified signal through the transmission line;
the transmission line is connected with the wireless module and used for transmitting the amplified signal to the wireless module.
2. The system of claim 1, wherein the antenna reception system further comprises a transmission line multiplexing circuit comprising a first circuit and a second circuit, wherein:
the first circuit is respectively connected with the low noise amplifier and the wireless module, and is used for blocking the antenna signal and providing a direct current power supply for the low noise amplifier;
the second circuit is respectively connected with the low noise amplifier and the wireless module and used for blocking the direct current power supply and transmitting the antenna signal.
3. The system of claim 2, wherein the first circuit comprises a first inductor, a second inductor, and the transmission line, wherein:
one end of the first inductor is connected with a power supply end of the wireless module, and the other end of the first inductor is connected with one end of the transmission line;
one end of the second inductor is connected with the other end of the transmission line, and the other end of the second inductor is connected with a power supply end of the low-noise amplifier, and is used for blocking the antenna signal and providing a direct-current power supply for the low-noise amplifier.
4. The system of claim 3, wherein the first circuit further comprises a first capacitance, wherein:
one end of the first capacitor is connected with the other end of the second inductor, and the other end of the first capacitor is connected with one end of the low-noise amplifier and used for decoupling the first circuit.
5. The system of claim 3, wherein the second circuit comprises a second capacitance, a third capacitance, and the transmission line, wherein:
one end of the second capacitor is connected with the other end of the low-noise amplifier, and the other end of the second capacitor is respectively connected with the other end of the transmission line and one end of the second inductor;
one end of the third capacitor is connected with one end of the transmission line and the other end of the first inductor respectively, and the other end of the third capacitor is connected with the input end of the wireless module and used for blocking the direct-current power supply and transmitting the antenna signal.
6. The system of claim 2, wherein the transmission line multiplexing circuit further comprises a ground circuit, wherein:
the grounding circuit is respectively connected with the low noise amplifier and the transmission line and is used for grounding the low noise amplifier and the transmission line.
7. The system of claim 1, wherein the transmission line comprises at least one of a stripline, a coaxial line, a twisted pair, and a triaxial line.
8. The system of claim 1, wherein the sensitivity of the antenna reception system as a function of noise figure is as follows:
S＝-174dBm+10lg(BW)+Eb/N0+NF
wherein dBm represents the power of the antenna signal, BW represents the bandwidth of the antenna signal, Eb is the power of the filtered signal, N0 is the power spectral density of the noise in the low noise amplifier, NF represents the noise figure of the antenna reception system;
and if the noise coefficient NF is smaller, the absolute value of the sensitivity S of the antenna receiving system is larger.
9. The system of claim 8, wherein the noise figure versus noise factor function is as follows:
NF＝10lg(F)
wherein F represents the noise factor, and if the noise factor F becomes smaller, the noise factor NF becomes smaller, and the absolute value of the sensitivity S of the antenna receiving system becomes larger.
10. An electronic device comprising an antenna receiving system according to any one of claims 1 to 9, the antenna receiving system being provided in the electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262491.9A CN112468094A (en) | 2020-11-12 | 2020-11-12 | Antenna receiving system and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262491.9A CN112468094A (en) | 2020-11-12 | 2020-11-12 | Antenna receiving system and electronic equipment |
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| Publication Number | Publication Date |
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| CN112468094A true CN112468094A (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011262491.9A Pending CN112468094A (en) | 2020-11-12 | 2020-11-12 | Antenna receiving system and electronic equipment |
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| CN (1) | CN112468094A (en) |
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- 2020-11-12 CN CN202011262491.9A patent/CN112468094A/en active Pending
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