Satellite communication dual frequency receiving circuit

Abstract

The embodiment of the specification provides a satellite communication dual-frequency receiving circuit, wherein the satellite communication dual-frequency receiving circuit comprises a first receiving link and a second receiving link; the first receiving link and the second receiving link are connected in series, an input end of the first receiving link serves as an input end of the satellite communication dual-frequency circuit, and an output end of the second receiving link serves as an output end of the satellite communication dual-frequency circuit; the first receiving link comprises a first dual-frequency filter and a first amplifier, the first dual-frequency filter is connected to the first amplifier, the second receiving link comprises a second dual-frequency filter and a second amplifier, and the second dual-frequency filter is connected to the second amplifier.

Description

Technical Field

[0001] The embodiments in this specification relate to the field of space transmission system technology, and in particular to dual-frequency satellite communication receiving circuits. Background Technology

[0002] With the development of 6G integrated space-air-ground networks, direct mobile phone connections to low-Earth orbit satellites are rapidly evolving. To meet the demand for full-area coverage, phased array antennas, with their rapid beam tracking capabilities, are crucial for terminals to achieve stable satellite-to-ground links. To improve system capacity and link robustness, dual-frequency reception has become an important design direction for phased array systems. However, existing dual-frequency RF front-ends often employ two independent filters and low-noise amplifiers to process signals in different frequency bands, switching the paths via switches. This architecture involves a large number of components and a large module size, making it difficult to meet the stringent requirements of phased arrays for high integration and miniaturization. This limits the implementation of advanced functions such as carrier aggregation and hinders further performance improvements. Therefore, a dual-frequency satellite communication receiver circuit is urgently needed to solve these problems. Summary of the Invention

[0003] In view of this, the embodiments of this specification provide a dual-frequency satellite communication receiving circuit.

[0004] According to a first aspect of the embodiments of this specification, a dual-frequency satellite communication receiving circuit is provided, comprising: a first receiving link and a second receiving link; The first receiving link and the second receiving link are connected in series. The input terminal of the first receiving link serves as the input terminal of the satellite communication dual-frequency circuit, and the output terminal of the second receiving link serves as the output terminal of the satellite communication dual-frequency circuit. The first receiving link includes a first dual-band filter and a first amplifier, with the first dual-band filter connected to the first amplifier. The second receiving link includes a second dual-band filter and a second amplifier, with the second dual-band filter connected to the second amplifier.

[0005] Optionally, the input signal is input to the first dual-frequency filter through the input terminal of the first receiving link to filter out non-operating frequency band signals in the input signal, obtain a first operating frequency band signal and a second operating frequency band signal, and output through the output terminal of the first receiving link.

[0006] Optionally, the first operating frequency band signal and the second operating frequency band signal are input to the first amplifier to enhance the signal strength corresponding to the first operating frequency band signal and the second operating frequency band signal, respectively, to obtain a first radio frequency signal corresponding to the first operating frequency band signal and a second radio frequency signal corresponding to the second operating frequency band signal.

[0007] Optionally, the input signal is input to the first dual-band filter through the input terminal of the first receiving link, and the first input signal in the input signal is processed by the first filter of the first dual-band filter to obtain the first operating frequency band signal, and the second input signal in the input signal is processed by the second filter of the first dual-band filter to obtain the second operating frequency band signal.

[0008] Optionally, both the first amplifier and the second amplifier are broadband amplifiers.

[0009] Optionally, the first radio frequency signal and the second radio frequency signal are input to the second dual-band filter of the second receiving link to suppress the frequency band signals of the first radio frequency signal and the second radio frequency signal, thereby obtaining the third radio frequency signal and the fourth radio frequency signal.

[0010] Optionally, the third radio frequency signal and the fourth radio frequency signal are input to the second amplifier to amplify the signal strengths corresponding to the third radio frequency signal and the fourth radio frequency signal, respectively, to obtain a fifth radio frequency signal corresponding to the third radio frequency signal and a sixth radio frequency signal corresponding to the fourth radio frequency signal.

[0011] Optionally, the first radio frequency signal and the second radio frequency signal are input to the second dual-band filter of the second receiving link, the first radio frequency signal is processed by the third filter of the second dual-band filter to obtain the third radio frequency signal, and the second radio frequency signal is processed by the fourth filter of the second dual-band filter to obtain the fourth radio frequency signal.

[0012] Optionally, the frequency range of the first input signal is 1710MHz to 1780MHz; the frequency range of the second input signal is 1920MHz to 2010MHz.

[0013] Optionally, the power gain of the first amplifier is a first power gain value; and the power gain of the second amplifier is a second power gain value.

[0014] According to a second aspect of the embodiments of this specification, a dual-frequency satellite communication receiver is provided, comprising: The first receiving link, the input end of the first receiving link serves as the input end of the satellite communication dual-frequency device, and is used to perform first filtering and first amplification processing on the input signal; The second receiving link, whose output terminal serves as the output terminal of the satellite communication dual-frequency device, is used to perform second filtering and second amplification processing on the input signal processed by the first receiving link.

[0015] The satellite communication dual-frequency receiving circuit provided in this specification includes a first receiving link and a second receiving link. The first receiving link and the second receiving link are connected in series. The input terminal of the first receiving link serves as the input terminal of the satellite communication dual-frequency circuit, and the output terminal of the second receiving link serves as the output terminal of the satellite communication dual-frequency circuit. The first receiving link includes a first dual-frequency filter and a first amplifier, with the first dual-frequency filter connected to the first amplifier. The second receiving link includes a second dual-frequency filter and a second amplifier, with the second dual-frequency filter connected to the second amplifier. The use of the dual-frequency filter supports the requirement of processing two operating frequency bands simultaneously, enabling simultaneous dual-frequency operation and providing a carrier aggregation working mode. The use of the first and second dual-frequency filters in the satellite communication dual-frequency receiving circuit can suppress signals in non-operating frequency bands, improving the circuit's interference suppression capability. Both the first and second amplifiers have broadband amplification capabilities, supporting the amplification requirements of two operating frequency bands while reducing the number of components, achieving high integration of the RF front-end module, resulting in a smaller front-end module size and lower power consumption for the satellite communication dual-frequency receiving circuit. Attached Figure Description

[0016] Figure 1 This is a connection diagram of a dual-frequency satellite communication receiving circuit provided in one embodiment of this specification; Figure 2 This is a schematic diagram of the structure of a dual-frequency satellite communication receiving circuit provided in one embodiment of this specification; Figure 3 This is a gain curve diagram of a dual-frequency satellite communication receiving circuit provided in one embodiment of this specification; Figure 4 This is a schematic diagram of the structure of a dual-frequency satellite communication receiver provided in one embodiment of this specification. Detailed Implementation

[0017] The specific embodiments of this application are described below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0019] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0021] In this application, terms such as "upper", "lower", "front", "back", "left", and "right" are used only to indicate the relative positional relationship between related parts, rather than to limit the absolute position of these related parts.

[0022] In this application, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0023] In this application, terms such as "equal" and "identical" are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0024] Unless otherwise stated, the numerical range in this application includes not only the entire range within its two endpoints, but also several subranges contained therein.

[0025] First, the terms and concepts used in one or more embodiments of this specification will be explained.

[0026] Non-terrestrial networks: These are communication networks that do not rely on traditional terrestrial base stations.

[0027] 6G refers to the sixth generation of mobile communication standards. Its core vision is to build a global three-dimensional network that integrates air, land, sea, and communication, and deeply integrates sensing, computing, and intelligence, so as to achieve seamless connection and real-time interaction between the physical and digital worlds.

[0028] In recent years, the deep integration of low-Earth orbit (LEO) satellite internet and terrestrial mobile communications has become a core development direction for 6G integrated space-air-ground networks. Direct connection between mobile phones and LEO satellites, with its advantages of full coverage, low latency, and wide access, has rapidly moved from technology verification to practical deployment. Globally, the large-scale networking of LEO satellite constellations continues to advance, and the gradual improvement of non-terrestrial network (NTN) standards is enabling ordinary smartphones to provide emergency communication, wide-area IoT, and broadband data services in areas without terrestrial cellular coverage. Due to high link loss, high dynamic satellite motion, and strict constraints on terminal size and power consumption, phased array antennas have become a key technological path to improve signal acquisition capabilities and achieve rapid beam tracking and multi-satellite coordination.

[0029] To ensure compatibility with multi-spectral resources and enhance link redundancy and system capacity, dual-frequency operation has become the mainstream design requirement for phased array systems. However, existing dual-frequency RF front-ends use two low-noise amplifiers and filters to cover two different frequency bands, which presents significant bottlenecks in terms of integration, noise performance, frequency band isolation, and batch adaptability. This makes it difficult to simultaneously meet comprehensive performance indicators such as dual-band coordination, low noise, high gain, miniaturization, low power consumption, and phased array multi-channel consistency, thus hindering the lightweighting and widespread adoption of direct mobile phone-to-satellite phased array communication. Therefore, a dual-frequency receiving RF front-end module for direct mobile phone-to-satellite phased array communication in low-Earth orbit has become an urgent need to overcome link performance and integration bottlenecks and support large-scale applications of integrated air-space-ground communication.

[0030] In view of this, an embodiment of this specification provides a dual-frequency satellite communication receiving circuit, including a first receiving link and a second receiving link. The first receiving link and the second receiving link are connected in series. The input terminal of the first receiving link serves as the input terminal of the dual-frequency satellite communication circuit, and the output terminal of the second receiving link serves as the output terminal of the dual-frequency satellite communication circuit. The first receiving link includes a first dual-frequency filter and a first amplifier. The first dual-frequency filter is connected to the first amplifier. The second receiving link includes a second dual-frequency filter and a second amplifier. The second dual-frequency filter is connected to the second amplifier. The use of the dual-frequency filter can support the requirement of processing two operating frequency bands simultaneously, enabling simultaneous dual-frequency operation and providing a carrier aggregation working mode. The use of the first and second dual-frequency filters in the dual-frequency satellite communication receiving circuit can suppress signals in non-operating frequency bands, improving the circuit's interference suppression capability. Both the first and second amplifiers have broadband amplification capabilities, supporting the amplification requirements of two operating frequency bands while reducing the number of components, achieving high integration of the RF front-end module, resulting in a smaller front-end module size and lower power consumption for the dual-frequency satellite communication receiving circuit.

[0031] See Figure 1 , Figure 1A schematic diagram of a satellite communication dual-frequency receiving circuit according to an embodiment of this specification is shown. The satellite communication dual-frequency receiving circuit includes a first receiving link and a second receiving link; the first receiving link and the second receiving link are connected in series, the input terminal of the first receiving link serves as the input terminal of the satellite communication dual-frequency circuit, and the output terminal of the second receiving link serves as the output terminal of the satellite communication dual-frequency circuit; the first receiving link includes a first dual-frequency filter and a first amplifier, the first dual-frequency filter being connected to the first amplifier; the second receiving link includes a second dual-frequency filter and a second amplifier, the second dual-frequency filter being connected to the second amplifier.

[0032] The satellite communication dual-frequency receiving circuit provided in this embodiment is integrated into a dual-frequency receiving RF front-end module and applied to a phased array on a low-Earth orbit mobile phone directly connected satellite. The satellite communication dual-frequency receiving circuit includes a first receiving link and a second receiving link. The output terminal of the first receiving link is connected to the input terminal of the second receiving link; that is, the first and second receiving links are connected in series. The operating frequency band signal output from the output terminal of the first receiving link is directly input to the second receiving link through its input terminal. The input terminal of the first receiving link serves as the operating frequency band signal input terminal of the satellite communication dual-frequency circuit, and the output terminal of the second receiving link serves as the operating frequency band signal output terminal of the satellite communication dual-frequency circuit. The first receiving link is used to suppress non-operating frequency band signals and amplify the operating frequency band signal from the input operating frequency band signal. The second receiving link is used to suppress non-operating frequency band signals and amplify the operating frequency band signal from the operating frequency band signal processed by the first receiving link and input to the second receiving link. The first dual-frequency filter and the second dual-frequency filter can be dual-frequency filters with the same structure and the same signal processing principle. Both the first dual-frequency filter and the second dual-frequency filter have the function of suppressing non-working frequency band signals in the input working frequency band signal and ensuring that the working frequency band signal passes through.

[0033] In practical applications, within integrated air-space-ground network scenarios, the dual-frequency satellite communication receiver circuit corresponds to a dual-frequency receiver RF front-end module for phased arrays on satellites directly connected to low-Earth orbit (LEO) mobile phones. It is applied to the phased arrays on these satellites to achieve dual-band signal reception. While meeting performance requirements such as dual-band coverage, low noise, and high out-of-band rejection, it simultaneously achieves high integration, miniaturization, and low power consumption, contributing to the lightweighting of phased arrays for direct mobile phone connections to satellites. The use of dual-frequency filters supports the simultaneous processing of two operating frequency bands, enabling simultaneous dual-frequency operation and providing a carrier aggregation working mode. The satellite communication dual-frequency receiver circuit uses a first and a second dual-frequency filter to suppress signals in non-operating frequency bands, improving the circuit's interference suppression capability. Both the first and second amplifiers have wideband amplification capabilities, supporting the amplification requirements of two operating frequency bands while reducing the number of components. This achieves high integration of the RF front-end module, resulting in a smaller size and lower power consumption for the corresponding front-end module of the satellite communication dual-frequency receiver circuit.

[0034] In specific implementation, such as Figure 2 As shown, the satellite communication dual-frequency receiving circuit includes a first receiving link consisting of a low-noise amplifier and a dual-frequency filter 1, and a second receiving link consisting of an amplifier and a dual-frequency filter 2. The low-noise amplifier is the first amplifier, and the amplifier in the second receiving link is the second amplifier. The first and second receiving links are connected in parallel. The input terminal of the first receiving link is the signal input terminal of the satellite communication dual-frequency receiving circuit, and the output terminal of the second receiving link is the signal output terminal of the satellite communication dual-frequency receiving circuit.

[0035] Furthermore, after receiving the radio frequency signal, the radio frequency signal can be used as an input signal from the input terminal of the first dual-band filter to the first receiving link. The first dual-band filter suppresses non-operating frequency band signals in the input signal, allowing the first and second operating frequency band signals to pass through, and outputs from the first dual-band filter. In specific implementation, the input signal is input to the first dual-band filter through the input terminal of the first receiving link, filtering out non-operating frequency band signals in the input signal to obtain the first and second operating frequency band signals, and outputting them through the output terminal of the first receiving link.

[0036] In practical applications, the input signal to the first dual-frequency filter can originate from a mobile terminal directly connected to a low-Earth orbit (LEO) satellite. The input of the dual-frequency filter can be connected to a phased array antenna element to receive the uplink radio frequency (RF) signal from the mobile terminal sensed by the phased array antenna element; this uplink RF signal is the input signal. The uplink RF signal from the mobile terminal can be received by the phased array on the LEO satellite equipped with the phased array antenna element and input to the first dual-frequency filter in the first receiving link. The mobile terminal can be a handheld smartphone, a tablet computer with satellite communication capabilities, a wearable device, or a satellite communication accessory such as a phone case. The first dual-frequency filter in the first receiving link has the function of processing two operating frequency bands, enabling simultaneous dual-frequency operation and carrier aggregation. The first operating frequency band signal and the second operating frequency band signal output by the first dual-frequency filter are the signals corresponding to the preset frequency bands of the first dual-frequency filter. The first and second operating frequency band signals correspond to different operating frequency bands, with the first operating frequency band signal operating at a frequency lower than the second operating frequency band signal.

[0037] Furthermore, considering that the first and second operating frequency band signals output by the first filter both originate from low-Earth orbit satellites, the signal loss during transmission results in relatively weak signals for both the first and second operating frequency band signals. Additionally, the processing by the first dual-frequency filter causes some loss to the input signal, leading to a decrease in signal strength. Therefore, in order to identify and process the signal subsequently, the first and second operating frequency band signals need to be input into the first amplifier in the first receiving link for signal strength enhancement, i.e., signal amplification. Specifically, the first and second operating frequency band signals are input into the first amplifier to enhance the signal strength corresponding to the first and second operating frequency band signals respectively, thereby obtaining the first radio frequency signal corresponding to the first operating frequency band signal and the second radio frequency signal corresponding to the second operating frequency band signal.

[0038] In practical applications, the signal strength of the first and second operating frequency band signals output by the first dual-frequency filter will be further reduced after processing by the filter; that is, the first dual-frequency filter will cause insertion loss for both signals. Furthermore, since the input signal source is a low-Earth orbit satellite, the spatial path loss of the first and second operating frequency band signals is significant due to the distance between the satellite and the mobile terminal. Limited by the antenna gain of the mobile terminal, the first and second operating frequency band signals output by the first dual-frequency filter are relatively weak. The first and second operating frequency band signals can be input together to a first amplifier for processing, thereby enhancing their signal strengths. The first amplifier can be a low-noise amplifier. Compared to the first radio frequency signal, the first operating frequency band signal has the same frequency band but enhanced signal strength; similarly, compared to the second radio frequency signal, the second operating frequency band signal has the same frequency band but enhanced signal strength.

[0039] Furthermore, the first dual-frequency filter is used to simultaneously process signals of two different frequency bands in the input signal. In order to process the first input signal and the second input signal in the input signal simultaneously, the first dual-frequency filter can be an integrated filter that integrates the first filter and the second filter. In specific implementation, the input signal is input to the first dual-frequency filter through the input terminal of the first receiving link. The first input signal in the input signal is processed by the first filter of the first dual-frequency filter to obtain the first operating frequency band signal, and the second input signal in the input signal is processed by the second filter of the first dual-frequency filter to obtain the second operating frequency band signal.

[0040] In practical applications, all signals in the input signal other than the first and second input signals are non-operating frequency band signals. That is, signals of any frequency band or frequency other than the operating frequency bands corresponding to the first and second input signals are non-operating frequency band signals. The first dual-band filter integrates a first filter and a second filter; that is, it integrates two independent filter elements. The first filter is responsible for passing the first input signal, and the second filter is responsible for passing the second input signal. The input and output terminals of the first and second filters are connected together, sharing one input interface and one output interface. When the input signal enters the first dual-band filter, the first and second filters work simultaneously, each filtering out the frequency band signal it is responsible for (the first operating frequency band signal and the second operating frequency band signal), which finally converge at the output terminal of the first dual-band filter. Figure 2As shown, the first dual-frequency filter is also known as dual-frequency filter 1. The first input signal corresponds to the operating frequency band 1, and the second input signal corresponds to the operating frequency band 2. The first input signal and the first operating frequency band signal both correspond to the same frequency band, and the second input signal and the second operating frequency band signal both correspond to the same frequency band.

[0041] Furthermore, both the first amplifier and the second amplifier are broadband amplifiers. The first amplifier is a broadband low-noise amplifier, capable of providing gain across all frequencies within the frequency range corresponding to the first and second operating frequency band signals, while simultaneously replenishing energy for both signals. The first and second operating frequency band signals, when input to the first amplifier, are two independent signal components that are simultaneously amplified. The second amplifier, also a broadband amplifier, is used to simultaneously amplify frequency band signal 1 and frequency band signal 2 output from the second dual-band filter, i.e., signal enhancement.

[0042] Furthermore, in order to improve the interference suppression capability of the dual-frequency receiving circuit for satellite communication, the first radio frequency signal and the second radio frequency signal output from the first receiving link can be input to the second receiving link to continue to suppress non-operating frequency band signals using the second dual-frequency filter. In specific implementation, the first radio frequency signal and the second radio frequency signal are input to the second dual-frequency filter of the second receiving link to suppress the frequency band signals of the first radio frequency signal and the second radio frequency signal, thereby obtaining the third radio frequency signal and the fourth radio frequency signal.

[0043] In practical applications, the first radio frequency (RF) signal corresponds to the third RF signal, and the second RF signal corresponds to the fourth RF signal. When the first RF signal corresponds to the third RF signal, it is input to the second dual-band filter for suppression of non-operating frequency band signals, and then outputs the third RF signal. The frequency band remains unchanged between the first and third RF signals. Similarly, when the second RF signal corresponds to the fourth RF signal, it is input to the second dual-band filter for suppression of non-operating frequency band signals, and then outputs the fourth RF signal. The frequency band remains unchanged between the second and fourth RF signals.

[0044] Furthermore, considering that the third and fourth radio frequency signals output by the second filter both originate from low-Earth orbit satellites, the signal loss during transmission results in relatively weak signals for the third and fourth radio frequency signals. Additionally, the processing by the second dual-frequency filter causes some loss to the input signal, leading to a decrease in signal strength. Therefore, in order to subsequently identify and process the signals, the third and fourth radio frequency signals need to be input to the second amplifier in the second receiving link for signal strength enhancement, i.e., signal amplification. Specifically, the third and fourth radio frequency signals are input to the second amplifier to amplify the signal strength corresponding to each signal, thereby obtaining the fifth radio frequency signal corresponding to the third radio frequency signal and the sixth radio frequency signal corresponding to the fourth radio frequency signal.

[0045] In practical applications, the signal strength of the third and fourth radio frequency (RF) signals output from the second dual-band filter will further decrease after processing by the filter; that is, the second dual-band filter will cause insertion loss for the third and fourth RF signals. Furthermore, since the input signal source is a low-Earth orbit (LEO) satellite, the spatial path loss of the third and fourth RF signals is significant due to the distance between the LEO satellite and the mobile terminal. Limited by the antenna gain of the mobile terminal, the third and fourth RF signals output from the second dual-band filter are relatively weak. The third and fourth RF signals can be input together to a second amplifier for processing, thereby enhancing their signal strength. The second amplifier can be a broadband amplifier. Compared to the fifth RF signal, the third RF signal has the same frequency band but enhanced signal strength; similarly, compared to the sixth RF signal, the fourth RF signal has the same frequency band but enhanced signal strength.

[0046] Furthermore, the second dual-band filter is used to simultaneously process the first radio frequency signal and the second radio frequency signal, which are two signals from different frequency bands. In order to process the first radio frequency signal and the second radio frequency signal simultaneously, the second dual-band filter can be an integrated filter that integrates a third filter and a fourth filter. In specific implementation, the first radio frequency signal and the second radio frequency signal are input to the second dual-band filter of the second receiving link. The first radio frequency signal is processed by the third filter of the second dual-band filter to obtain the third radio frequency signal, and the second radio frequency signal is processed by the fourth filter of the second dual-band filter to obtain the fourth radio frequency signal.

[0047] In practical implementation, the signal input to the second dual-band filter also includes signals other than the first and second radio frequency (RF) signals. These other signals are all non-operating frequency band signals; that is, signals of other frequency bands or frequencies input to the second dual-band filter besides the first and second RF signals are non-operating frequency band signals. The second dual-band filter integrates a third and a fourth filter, meaning it internally integrates two independent filter elements. The third filter is responsible for passing the first RF signal, and the fourth filter is responsible for passing the second RF signal. The input and output terminals of the third and fourth filters are connected together, sharing a single input interface and an output interface. When the input signal, which combines the first and second RF signals, enters the second dual-band filter, the third and fourth filters operate simultaneously, each filtering out the responsible frequency band signal (the third RF signal and the fourth RF signal), which ultimately converges at the output terminal of the second dual-band filter. Figure 2 As shown, the second dual-band filter is also known as dual-band filter 2. The first radio frequency signal corresponds to the operating frequency band 1, and the second radio frequency signal corresponds to the operating frequency band 2. The first radio frequency signal and the third radio frequency signal both correspond to the same frequency band, and the second radio frequency signal and the fourth radio frequency signal both correspond to the same frequency band.

[0048] In practical applications, such as Figure 3 As shown, the S-parameter gain curve of the dual-band receiver RF front-end module is plotted, with the vertical axis representing S... 21 The horizontal axis represents frequency f (Hz), and the graph shows the curve of the forward transmission coefficient (gain) as a function of frequency. Operating frequency band 1 and operating frequency band 2 are... Figure 3 The two distinct "plateau" regions indicate that the dual-frequency satellite communication receiver circuit has good signal transmission capability (i.e., flat gain and low insertion loss) within these two frequency bands. This is precisely the manifestation of the "dual-frequency" characteristic. 21 The "height" of the curve represents the gain. Within the operating frequency band, S 21 A high and flat value indicates that the dual-frequency receiving circuit for satellite communication has good amplification or low-loss transmission capability for signals in these two frequency bands. Outside the operating frequency band, S... 21 The value drops sharply, forming a low-value region resembling "noise," indicating that the dual-frequency satellite communication receiving circuit has a strong ability to suppress out-of-band interference signals.

[0049] Furthermore, the frequency range of the first input signal is 1710MHz to 1780MHz; the frequency range of the second input signal is 1920MHz to 2010MHz.

[0050] In practical applications, such as Figure 2As shown, the frequency range of the first input signal in the input signal to dual-frequency filter 1 is 1710MHz to 1780MHz; the frequency range of the second input signal in the input signal to dual-frequency filter 1 is 1920MHz to 2010MHz. During the sequential processing of the first and second input signals by dual-frequency filter 1, dual-frequency filter 2, low-noise amplifier, and amplifier, the frequency range of the first input signal remains unchanged, and the frequency range of the second input signal also remains unchanged. Since both the first and second dual-band filters allow two types of signals—one with a frequency range of 1710MHz to 1780MHz and the other with a frequency range of 1920MHz to 2010MHz—to pass through simultaneously, the frequency ranges of these two types of signals remain unchanged during processing. Specifically, the first operating frequency band signal output by dual-band filter 1, the first radio frequency signal output by the low-noise amplifier, the third radio frequency signal output by dual-band filter 2, and the fifth radio frequency signal output by the amplifier all have a frequency range of 1710MHz to 1780MHz; the second operating frequency band signal output by dual-band filter 1, the second radio frequency signal output by the low-noise amplifier, the fourth radio frequency signal output by dual-band filter 2, and the sixth radio frequency signal output by the amplifier all have a frequency range of 1920MHz to 2010MHz.

[0051] Furthermore, the signal strength of the input signal is -120dBm; the power gain of the first amplifier is a first power gain value; and the power gain of the second amplifier is a second power gain value.

[0052] In practical applications, the power gain of the first and second RF signals output by the low-noise amplifier is the first power gain value, which can be 27dB. The power gain of the fifth and sixth RF signals output by the amplifier is the second power gain value, which can be 21dB. When both the first and second operating frequency band signals are -120dBm, after simultaneous processing by the first amplifier, the output first and second RF signals can both be -99dBm. After processing by the second dual-band filter, the first and second RF signals are still -99dBm, meaning the third and fourth RF signals are both -99dBm. After simultaneous processing by the second amplifier, the third and fourth RF signals are both -72dBm.

[0053] In summary, the satellite communication dual-frequency receiving circuit provided in this specification includes a first receiving link and a second receiving link. The first receiving link and the second receiving link are connected in series. The input terminal of the first receiving link serves as the input terminal of the satellite communication dual-frequency circuit, and the output terminal of the second receiving link serves as the output terminal of the satellite communication dual-frequency circuit. The first receiving link includes a first dual-frequency filter and a first amplifier, with the first dual-frequency filter connected to the first amplifier. The second receiving link includes a second dual-frequency filter and a second amplifier, with the second dual-frequency filter connected to the second amplifier. The use of the dual-frequency filter supports the requirement of processing two operating frequency bands simultaneously, enabling simultaneous dual-frequency operation and providing a carrier aggregation working mode. The use of the first and second dual-frequency filters in the satellite communication dual-frequency receiving circuit can suppress signals in non-operating frequency bands, improving the circuit's interference suppression capability. Both the first and second amplifiers have broadband amplification capabilities, supporting the amplification requirements of two operating frequency bands while reducing the number of components, achieving high integration of the RF front-end module, resulting in a smaller front-end module size and lower power consumption for the satellite communication dual-frequency receiving circuit.

[0054] Corresponding to the above method embodiments, this specification also provides embodiments of a dual-frequency satellite communication receiver. Figure 4 A schematic diagram of a dual-frequency satellite communication receiver according to one embodiment of this specification is shown. Figure 4 As shown, the device includes: The first receiving link, the input end of the first receiving link serves as the input end of the satellite communication dual-frequency device, and is used to perform first filtering and first amplification processing on the input signal; The second receiving link, whose output terminal serves as the output terminal of the satellite communication dual-frequency device, is used to perform second filtering and second amplification processing on the input signal processed by the first receiving link.

[0055] The dual-frequency satellite communication receiver provided in this specification includes a first receiving link and a second receiving link. An input signal is input to the first receiving link. The input terminal of the first receiving link serves as the input terminal of the dual-frequency satellite communication receiver, used to perform a first filtering and amplification processing on the input signal. The first receiving link includes a first dual-frequency filter and a first amplifier, with the first dual-frequency filter connected to the first amplifier. The input signal processed by the first receiving link is input to the second receiving link. The output terminal of the second receiving link serves as the output terminal of the dual-frequency satellite communication receiver, used to perform a second filtering and amplification processing on the input signal processed by the first receiving link. The second receiving link includes a second dual-frequency filter and a second amplifier, with the second dual-frequency filter connected to the second amplifier.

[0056] The above is a schematic scheme of a dual-frequency satellite communication receiving device according to this embodiment. It should be noted that the technical solution of this dual-frequency satellite communication receiving device and the technical solution of the dual-frequency satellite communication receiving circuit described above belong to the same concept. For details not described in detail in the technical solution of the dual-frequency satellite communication receiving device, please refer to the description of the technical solution of the dual-frequency satellite communication receiving circuit described above.

[0057] The preferred embodiments and examples of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the concept of this application.

[0058] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0059] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0061] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A dual-frequency satellite communication receiver circuit, characterized in that, Including the first receiving link and the second receiving link; The first receiving link and the second receiving link are connected in series. The input terminal of the first receiving link serves as the input terminal of the satellite communication dual-frequency circuit, and the output terminal of the second receiving link serves as the output terminal of the satellite communication dual-frequency circuit. The first receiving link includes a first dual-band filter and a first amplifier, with the first dual-band filter connected to the first amplifier. The second receiving link includes a second dual-band filter and a second amplifier, with the second dual-band filter connected to the second amplifier.

2. The satellite communication dual-frequency receiving circuit according to claim 1, characterized in that, The input signal is input to the first dual-frequency filter through the input terminal of the first receiving link, filtering out non-operating frequency band signals in the input signal to obtain a first operating frequency band signal and a second operating frequency band signal, and output through the output terminal of the first receiving link.

3. The satellite communication dual-frequency receiving circuit according to claim 2, characterized in that, The first operating frequency band signal and the second operating frequency band signal are input to the first amplifier to enhance the signal strength corresponding to the first operating frequency band signal and the second operating frequency band signal, respectively, to obtain a first radio frequency signal corresponding to the first operating frequency band signal and a second radio frequency signal corresponding to the second operating frequency band signal.

4. The satellite communication dual-frequency receiving circuit according to claim 2, characterized in that, The input signal is input to the first dual-frequency filter through the input terminal of the first receiving link. The first input signal in the input signal is processed by the first filter of the first dual-frequency filter to obtain the first operating frequency band signal, and the second input signal in the input signal is processed by the second filter of the first dual-frequency filter to obtain the second operating frequency band signal.

5. The satellite communication dual-frequency receiving circuit according to claim 4, characterized in that, Both the first amplifier and the second amplifier are broadband amplifiers.

6. The satellite communication dual-frequency receiving circuit according to claim 3, characterized in that, The first radio frequency signal and the second radio frequency signal are input to the second dual-band filter of the second receiving link to suppress the frequency band signals of the first radio frequency signal and the second radio frequency signal, thereby obtaining the third radio frequency signal and the fourth radio frequency signal.

7. The satellite communication dual-frequency receiving circuit according to claim 6, characterized in that, The third radio frequency signal and the fourth radio frequency signal are input to the second amplifier to amplify the signal strengths corresponding to the third radio frequency signal and the fourth radio frequency signal, respectively, to obtain the fifth radio frequency signal corresponding to the third radio frequency signal and the sixth radio frequency signal corresponding to the fourth radio frequency signal.

8. The satellite communication dual-frequency receiving circuit according to claim 6, characterized in that, The first radio frequency signal and the second radio frequency signal are input to the second dual-band filter of the second receiving link. The first radio frequency signal is processed by the third filter of the second dual-band filter to obtain the third radio frequency signal, and the second radio frequency signal is processed by the fourth filter of the second dual-band filter to obtain the fourth radio frequency signal.

9. The satellite communication dual-frequency receiving circuit according to claim 4, characterized in that, The frequency range of the first input signal is 1710MHz to 1780MHz; the frequency range of the second input signal is 1920MHz to 2010MHz.

10. The satellite communication dual-frequency receiving circuit according to claim 1, characterized in that, The power gain of the first amplifier is a first power gain value; the power gain of the second amplifier is a second power gain value.

11. A dual-frequency satellite communication receiver, characterized in that, include: The first receiving link, the input end of the first receiving link serves as the input end of the satellite communication dual-frequency device, and is used to perform first filtering and first amplification processing on the input signal; The second receiving link, whose output terminal serves as the output terminal of the satellite communication dual-frequency device, is used to perform second filtering and second amplification processing on the input signal processed by the first receiving link.

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