Integrated KaKu dual-frequency transceiver

Abstract

The invention belongs to the technical field of satellite communication, and particularly discloses an integrated KaKu dual-frequency transceiver, which comprises an all-in-one machine main body, and is characterized in that the all-in-one machine main body is internally provided with an intermediate frequency selection network used for selecting and separating intermediate frequency signals with different frequencies; the KaKu dual-band BUC module is used for performing up-conversion on the intermediate-frequency signal and amplifying the intermediate-frequency signal into a radio-frequency signal of a Ka or Ku band; the KaKu dual-band LNB module is used for down-converting the radio frequency signal of the Ka or Ku band to an intermediate frequency; and the KaKu dual-band feed network is used for separating and synthesizing the radio frequency signals of the Ka or Ku band which are down-converted to the intermediate frequency. According to the invention, receiving and transmitting duplex of Ka and Ku dual-band signals in one device can be realized, and the problems of single-frequency work, complex device and heavy weight of a traditional terminal can be solved.

Description

Technical Field

[0001] This application belongs to the field of satellite communication technology, specifically relating to an integrated KaKu dual-frequency transceiver. Background Technology

[0002] Satellite communication, as a crucial means of communication, is indispensable in daily business operations, especially in special fields such as emergency communications, where it plays an irreplaceable role. Therefore, the performance of its terminal equipment directly affects the timeliness of communication under special needs. Considering that satellite communication is generally used in geographically complex areas, traditional satellite communication terminals typically only support operation on a single frequency band. In actual use, malfunctions may occur, affecting the timeliness of emergency communications.

[0003] Traditional satellite communication terminals mainly consist of two types: reflector antennas and planar array antennas. Reflectors naturally support dual-band operation; the only challenge lies in whether the radio frequency (RF) front-end can support dual-band operation. Existing RF front-ends consist of a duplexer, an up-conversion power amplifier (BUC), and a low-noise down-converter (LNB), such as... Figure 1 As shown, it can only work on one frequency band. If you want to achieve dual-band operation, you need to install two BUCs and two LNBs, which will significantly increase the weight of the whole machine and make the overall structure more complex, and the operation of switching frequency bands will be complicated. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this application is to provide an integrated Ka-Ku dual-band transceiver. This application, through highly integrated Ka-Ku dual-band BUC, LNB, and power supply network, enables full-duplex transmission and reception of Ka and Ku dual-band signals within a single device, solving the problems of traditional single-frequency operation, complex equipment, and heavy weight.

[0005] To achieve the above objectives, this application provides the following technical solution: An integrated Ka-Ku dual-band transceiver includes: a main body, within which are: an intermediate frequency (IF) selection network for selecting and separating IF signals of different frequencies; a Ka-Ku dual-band BUC module for up-converting and amplifying the IF signals into Ka or Ku band radio frequency (RF) signals; a Ka-Ku dual-band LNB module for down-converting the Ka or Ku band RF signals to the IF; and a Ka-Ku dual-band power supply network for separating and synthesizing the down-converted Ka or Ku band RF signals to the IF.

[0006] Optionally, the KaKu dual-band BUC module includes: a gain control and signal conditioning unit, the output of which is electrically connected to a first up-conversion branch and a first power amplification branch connected in series, and a second up-conversion branch and a second power amplification branch connected in series. The gain control and signal conditioning unit is used to condition the intermediate frequency (IF) signal from the IF selection network; the first up-conversion branch is used to up-convert the conditioned IF signal to a Ku-band radio frequency (RF) signal; the first power amplification branch is used to amplify the power of the up-converted Ku-band RF signal; the second up-conversion branch is used to up-convert the conditioned IF signal to a Ka-band RF signal; and the second power amplification branch is used to amplify the power of the up-converted Ka-band RF signal.

[0007] Optionally, the gain control and signal conditioning unit includes: a first π-type attenuator, a digitally controlled attenuator, and a high-pass filter connected in sequence. The output terminal of the high-pass filter is connected to the first terminal of a first switching switch, and the second terminal of the first switching switch is connected to the first up-conversion branch and the second up-conversion branch, respectively. The input terminal of the first π-type attenuator is connected to the output terminal of the intermediate frequency (IF) selection network to provide fixed signal attenuation to the IF signal. The data attenuator controls the amplitude of the IF signal to achieve automatic gain controllability. The high-pass filter filters out low-frequency components and out-of-band noise from the IF signal, retaining and shaping the required IF signal. The first switching switch routes the shaped IF signal to the first up-conversion branch or the second up-conversion branch.

[0008] Optionally, the first up-conversion branch and the second up-conversion branch have the same structure. The first up-conversion branch includes: a second π-type attenuator, a first operational amplifier, a third π-type attenuator, an analog multiplier, a first filter, a second operational amplifier, and a second filter connected in sequence. The input terminal of the second π-type attenuator serves as the input terminal of the first up-conversion branch and is connected to the output terminal of the gain control and signal conditioning unit. The output terminal of the second filter serves as the output terminal of the first up-conversion branch and is connected to the input terminal of the first power amplifier branch.

[0009] Optionally, the first power amplification branch and the second power amplification branch have the same structure. The first power amplification branch includes a cascaded third operational amplifier and a fourth operational amplifier, wherein the input terminal of the third operational amplifier serves as the input terminal of the first power amplification branch, and the output terminal of the third operational amplifier is connected to the input terminal of the fourth operational amplifier.

[0010] Optionally, the KaKu dual-band BUC module further includes: a frequency source, a first amplifier, and a second switching switch, wherein the output terminal of the frequency source is connected to the first terminal of the second switching switch via the amplifier, and the second terminal of the second switching switch is connected to the first up-conversion branch and the second up-conversion branch respectively.

[0011] Optionally, the KaKu dual-band LNB module includes: a first down-conversion branch and a second down-conversion branch. The output terminals of the first down-conversion branch and the second down-conversion branch are electrically connected to an intermediate frequency signal conditioning unit. The first down-conversion branch is used to down-convert the Ku-band radio frequency signal to the intermediate frequency, and the second down-conversion branch is used to down-convert the Ka-band radio frequency signal to the intermediate frequency.

[0012] Optionally, the first down-conversion branch and the second down-conversion branch have the same structure. The first down-conversion branch includes: a first microstrip filter, an analog multiplier, a fourth π-type attenuator, a fifth operational amplifier, a bandpass filter, and a sixth operational amplifier connected in sequence. The input terminal of the first microstrip filter is connected to the output terminal of the first low-noise amplification branch as the input terminal of the first down-conversion branch, and the output terminal of the sixth operational amplifier is connected to the input terminal of the intermediate frequency signal conditioning unit as the output terminal of the first down-conversion branch.

[0013] Optionally, the intermediate frequency signal conditioning unit includes a low-pass filter and a fifth π-type attenuator; wherein, the input terminal of the low-pass filter is connected to the input terminal of the intermediate frequency signal conditioning unit and the input terminal of the fifth π-type attenuator, and the output terminal of the fifth π-type attenuator is output to the intermediate frequency signal conditioning unit to output a Ka or Ku band radio frequency signal down-converted to the intermediate frequency.

[0014] Optionally, the KaKu dual-band power supply network includes: an integrated Ku-band duplexer and a Ka-band dual-channel filter.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This application achieves an integrated design by highly integrating the transmission (BUC), reception (LNB), and signal routing (feed network) functions of the Ka and Ku dual-band into a single compact module. This greatly simplifies the structure of the satellite communication terminal, significantly reduces the size and weight of the equipment, and solves the problem of bulkiness and complexity caused by the need to install multiple independent BUCs and LNBs in traditional solutions.

[0016] This application adopts an architecture with shared signal conditioning, a common local oscillator (PLL), and a shared intermediate frequency conditioning unit, which not only reduces hardware complexity and manufacturing costs, but also ensures the consistency and high reliability of signal performance in both Ka and Ku bands during transmission and reception. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an integrated KaKu dual-frequency transceiver provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a KaKu dual-band BUC module provided in another embodiment of this application; Figure 3 This is a schematic diagram of the structure of a KaKu dual-band LNB module provided in another embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] Figure 1 This is a schematic diagram of the structure of an integrated KaKu dual-band transceiver provided in one embodiment of this application, as shown below. Figure 1 As shown, the all-in-one machine includes: an all-in-one machine body, within which are disposed: an intermediate frequency (IF) selection network for selecting and separating IF signals of different frequencies; a Ka-Ku dual-band BUC module for up-converting and amplifying the IF signals into Ka or Ku-band radio frequency (RF) signals; a Ka-Ku dual-band LNB module for down-converting the Ka or Ku-band RF signals to the IF frequency; and a Ka-Ku dual-band power supply network for separating and synthesizing the down-converted Ka or Ku-band RF signals to the IF frequency.

[0023] In this embodiment, the integrated Ka-Ku dual-band transceiver achieves complete dual-band full-duplex communication through the coordinated operation of its internal modules. In the transmission path, the intermediate frequency (IF) selection network first selects and separates the input IF signal, feeding the processed signal into the Ka-Ku dual-band BUC module. According to system instructions, the BUC module, through its internal gain control and signal conditioning unit, adjusts the amplitude and shapes the spectrum of the IF signal before routing it to the corresponding Ka or Ku band processing channel. This process sequentially performs up-conversion and power amplification, ultimately outputting a high-power Ka or Ku band RF signal. In the reception path, the composite Ka / Ku band RF signal from the antenna is first separated by the Ka-Ku dual-band feed network. The separated signals are then fed into the corresponding channels of the Ka-Ku dual-band LNB module. The LNB module, through its internal low-noise amplification and down-conversion branches, amplifies the weak Ka or Ku band RF signal and down-converts it to the IF.

[0024] In summary, the entire system achieves signal synthesis and separation at the shared antenna end through the feed network, thus efficiently completing signal transmission and reception in both Ka and Ku bands within an integrated structure, realizing dual-band duplex operation in a compact structure.

[0025] In another exemplary embodiment, such as Figure 2 As shown, the KaKu dual-band BUC module includes: a gain control and signal conditioning unit. The output of the gain control and signal conditioning unit is electrically connected to a first up-conversion branch and a first power amplification branch arranged in series, and is also electrically connected to a second up-conversion branch and a second power amplification branch arranged in series. The gain control and signal conditioning unit is used to condition the intermediate frequency (IF) signal from the IF selection network. The first up-conversion branch is used to up-convert the conditioned IF signal to a Ku-band radio frequency (RF) signal. The first power amplification branch is used to amplify the power of the up-converted Ku-band RF signal. The second up-conversion branch is used to up-convert the conditioned IF signal to a Ka-band RF signal. The second power amplification branch is used to amplify the power of the up-converted Ka-band RF signal.

[0026] In this embodiment, the KaKu dual-band BUC module adopts a split-parallel processing architecture to realize the dual-band transmission function. Its core workflow begins with the gain control and signal conditioning unit. This unit performs precise amplitude control (including fixed attenuation and numerically controlled AGC adjustment) and spectrum purification (high-pass filtering) on ​​the intermediate frequency signal from the intermediate frequency selection network to form a high-quality reference intermediate frequency signal. Then, it routes the signal to the processing channel of the specified frequency band through a built-in switching switch. When the Ku band is selected, the signal enters the series channel composed of the first up-conversion branch and the first power amplification branch, and sequentially completes the frequency conversion and power enhancement from intermediate frequency to Ku radio frequency. When the Ka band is selected, the signal enters the second up-conversion branch and the second power amplification branch, which are completely symmetrical with the Ku channel, to perform frequency conversion and amplification from intermediate frequency to Ka radio frequency. The two channels share key resources such as the gain control and signal conditioning unit and frequency source at the front end, and achieve time-division multiplexing through switching.

[0027] The technical benefits of this module can be seen in the following three aspects: First, the module supports Ka / Ku dual-band transmission simultaneously through a highly integrated hardware architecture, effectively solving the problem of increased equipment size and weight and structural complexity caused by the need to install two independent BUCs in traditional solutions; Second, the design of shared signal conditioning and frequency source significantly reduces system complexity and the number of components, while ensuring the consistency of dual-band transmission signal quality through a common reference; Finally, this modular parallel structure enables the device to maintain excellent RF performance (including excellent spectral purity and power efficiency) while achieving compactness, lightweight design, and high reliability, greatly improving the frequency band adaptability and deployment flexibility of satellite communication terminals in complex environments.

[0028] In another exemplary embodiment, the gain control and signal conditioning unit includes: a first π-type attenuator, a digitally controlled attenuator, and a high-pass filter connected in sequence. The output terminal of the high-pass filter is connected to the first terminal of a first switching switch, and the second terminal of the first switching switch is connected to the first up-conversion branch and the second up-conversion branch, respectively. The input terminal of the first π-type attenuator is connected to the output terminal of the intermediate frequency (IF) selection network to provide fixed signal attenuation to the IF signal. The data attenuator controls the amplitude of the IF signal to achieve automatic gain controllability. The high-pass filter filters out low-frequency components and out-of-band noise from the IF signal, retaining and shaping the required IF signal. The first switching switch routes the shaped IF signal to either the first up-conversion branch or the second up-conversion branch.

[0029] In this embodiment, the gain control and signal conditioning unit achieves precise control of the intermediate frequency (IF) signal through three-stage cascaded processing and path selection: the IF signal from the IF selection network first undergoes a fixed amount of signal attenuation through the first π-type attenuator, establishing a suitable signal base for subsequent dynamic adjustment; then the signal enters the digitally controlled attenuator, which achieves dynamic and precise control of the signal amplitude through its programmable attenuation amount, constituting the core execution link of automatic gain control (AGC) to ensure the stability of the output level under different input conditions; the amplitude-modulated signal then passes through a high-pass filter to effectively filter out low-frequency interference components and out-of-band noise in the signal, completing the spectrum shaping and purification of the IF signal; finally, the processed pure IF signal is sent to the first switching switch, which accurately routes the signal to the corresponding first upconversion branch (Ku band) or second upconversion branch (Ka band) according to the system frequency band selection command.

[0030] This unit, through its integrated design of fixed attenuation, digitally controlled attenuation, filtering, and path switching, not only achieves precise and automated management of the amplitude and spectral quality of the intermediate frequency signal, significantly improving the system's adaptability to different input signals and output consistency, but also efficiently serves two independent upconversion channels through a shared front-end conditioning link and a switching switch. This replaces the traditional design that requires two independent conditioning circuits, thereby significantly optimizing the system structure and reducing hardware complexity and cost while ensuring excellent signal quality.

[0031] In another exemplary embodiment, the first upconversion branch and the second upconversion branch have the same structure. The first upconversion branch includes: a second π-type attenuator, a first operational amplifier, a third π-type attenuator, an analog multiplier, a first filter, a second operational amplifier, and a second filter connected in sequence. The input terminal of the second π-type attenuator serves as the input terminal of the first upconversion branch and is connected to the output terminal of the gain control and signal conditioning unit. The output terminal of the second filter serves as the output terminal of the first upconversion branch and is connected to the input terminal of the first power amplifier branch.

[0032] In this embodiment, the working principle of the first upconversion branch is as follows: The intermediate frequency signal from the gain control and signal conditioning unit is first matched and regulated by the second π-type attenuator to prevent overload of subsequent circuits; then the signal enters the first operational amplifier for preliminary amplification to compensate for path loss and provide sufficient gain; the amplified signal is then precisely amplitude-controlled by the third π-type attenuator to provide the optimal drive level for the mixer; thereafter, the signal enters the core analog multiplier and is mixed with the local oscillator signal from the frequency source to complete the frequency upconversion from intermediate frequency to Ku-band radio frequency; the high-frequency output generated by the mixing contains the required radio frequency signal and various harmonics and spurious components, which are first initially selected by the first filter to suppress most of the out-of-band noise and spurious components; the radio frequency signal after preliminary filtering is then amplified by the second operational amplifier to compensate for the signal loss during mixing and filtering; finally, the signal is finally purified by the second filter to accurately filter out residual out-of-band spurious components and useless sidebands, and outputs a clean and stable Ku-band radio frequency signal to the subsequent first power amplification branch.

[0033] The first upconversion branch, through a cascaded design of "attenuation-amplification-mixing-filtering-re-amplification-re-filtering", achieves fine management of signal level, high-efficiency frequency conversion, and strict spectrum shaping, ensuring that the upconversion process has high linearity, low spurious output, and excellent spectral purity. The introduction of multi-stage attenuators enhances the circuit's anti-interference capability and dynamic range, while the segmented setting of the filters effectively guarantees the quality of the final output RF signal, meeting the stringent requirements of satellite communication for transmitted signals.

[0034] Furthermore, since the second up-conversion branch and the first up-conversion branch have the same structure, their working principles are also the same, so they will not be described again here.

[0035] In another exemplary embodiment, the first power amplification branch and the second power amplification branch have the same structure. The first power amplification branch includes a cascaded third operational amplifier and a fourth operational amplifier, wherein the input terminal of the third operational amplifier serves as the input terminal of the first power amplification branch, and the output terminal of the third operational amplifier is connected to the input terminal of the fourth operational amplifier.

[0036] In this embodiment, the frequency-converted radio frequency signal from the first up-conversion branch is first input to the third operational amplifier. This amplifier, acting as a driver stage, performs a preliminary power boost on the radio frequency signal to provide sufficient gain to drive subsequent stages. Subsequently, the pre-amplified signal is directly fed into the fourth operational amplifier, which, acting as a power output stage, further amplifies the signal, aiming to increase the output power of the signal to the final transmission level required by the system. Through the cascaded amplification of these two operational amplifier stages, this branch achieves a high-gain, linear amplification process for the radio frequency signal, ensuring that the signal maintains good spectral characteristics and low distortion during amplification, thereby meeting the stringent requirements for transmission signal power and quality in satellite communication.

[0037] In another exemplary embodiment, the KaKu dual-band BUC module further includes: a frequency source, a first amplifier, and a second switching switch, wherein the output terminal of the frequency source is connected to the first terminal of the second switching switch via the first amplifier, and the second terminal of the second switching switch is connected to the first up-conversion branch and the second up-conversion branch respectively.

[0038] In this embodiment, the frequency source can generate a highly stable and high-precision local oscillator signal. This signal is first amplified by a first amplifier to provide sufficient driving capability. Subsequently, the amplified local oscillator signal is sent to a second switching switch. This switch can accurately route the local oscillator signal to the corresponding first up-conversion branch (for the Ku band) or second up-conversion branch (for the Ka band) according to the system's operating frequency band command (Ka or Ku), providing the local oscillation necessary for frequency conversion for each mixer.

[0039] The above structure, by sharing a high-performance common frequency source and combining it with a switching switch for signal distribution, replaces the traditional approach of configuring a separate frequency source for each upconversion branch. This significantly simplifies the hardware architecture and reduces the system's size, weight, complexity, and manufacturing cost. At the same time, it ensures that the Ka and Ku transmission channels have local oscillator references with the same source and consistent characteristics, fundamentally avoiding system performance instability caused by frequency drift or phase noise differences between multiple independent frequency sources, and greatly improving the consistency and reliability of the integrated machine when operating in dual frequency bands.

[0040] In another exemplary embodiment, such as Figure 3 As shown, the KaKu dual-band LNB module includes: a first downconversion branch and a second downconversion branch. The output terminals of the first downconversion branch and the second downconversion branch are electrically connected to an intermediate frequency signal conditioning unit. The first downconversion branch is used to downconvert the Ku-band radio frequency signal to the intermediate frequency, and the second downconversion branch is used to downconvert the Ka-band radio frequency signal to the intermediate frequency.

[0041] In this embodiment, a first low-noise amplification branch is provided before the first down-conversion branch, and a second low-noise amplification branch is provided before the second down-conversion branch. The first low-noise amplification branch and the second low-noise amplification branch have the same structure, each consisting of two cascaded amplifiers.

[0042] The Ka-Ku dual-band LNB module achieves dual-band reception through two integrated independent branches. The Ku-band RF signal is processed sequentially through a first low-noise amplification branch and a first down-conversion branch, while the Ka-band signal is processed through a second low-noise amplification branch and a second down-conversion branch. Its core working principle is that the low-noise amplification branch at the entrance of each channel first amplifies the extremely weak satellite received signal to improve the signal level and ensure a very low noise figure, laying the foundation for the signal-to-noise ratio in subsequent processing. The amplified RF signal then enters its corresponding down-conversion branch, where the Ka or Ku-band RF signal is down-converted to a standard intermediate frequency (IF) through mixing. It then undergoes filtering and multi-stage amplification to remove spurious signals and optimize signal quality. Finally, the IF signals output from both branches are merged into a shared IF signal conditioning unit for unified gain calibration and filtering before being output.

[0043] The above architecture not only enables high-sensitivity, low-noise parallel reception of signals in both Ka and Ku bands, ensuring excellent reception performance, but also greatly optimizes the internal structure of the module and reduces the number of components by sharing a back-end conditioning circuit. This achieves miniaturization, lightweighting, and low cost of the device, while simplifying system design and improving the overall reliability.

[0044] In another exemplary embodiment, the first down-conversion branch and the second down-conversion branch have the same structure, wherein the first down-conversion branch includes: a first microstrip filter, an analog multiplier, a fourth π-type attenuator, a fifth operational amplifier, a bandpass filter, and a sixth operational amplifier connected in sequence; wherein, The input terminal of the first microstrip filter is connected to the output terminal of the first low-noise amplification branch as the input terminal of the first down-conversion branch, and the output terminal of the sixth operational amplifier is connected to the input terminal of the intermediate frequency signal conditioning unit as the output terminal of the first down-conversion branch.

[0045] In this embodiment, the Ku-band RF signal from the first low-noise amplification branch first enters the first microstrip filter, which performs preliminary frequency selection to effectively suppress out-of-band interference and image frequencies. Subsequently, the signal is fed into an analog multiplier and mixed with the local oscillator signal from the frequency source, completing the down-conversion process from RF to IF. The resulting mixed output signal undergoes amplitude adjustment via a fourth π-type attenuator to optimize the signal level and prevent overload of subsequent circuits. Afterward, the signal is initially amplified by a fifth operational amplifier to compensate for conversion losses. The amplified signal is then filtered by a bandpass filter to remove high-order harmonics and spurious components generated during mixing, accurately extracting the target IF signal. Finally, the clean IF signal is amplified again by a sixth operational amplifier to reach the required level for subsequent IF signal conditioning units, thus completing the entire down-conversion and signal conditioning process. This branch, through the coordinated design of filtering, mixing, attenuation, and multi-stage amplification, achieves efficient and clean down-conversion of the RF signal, ensuring that the IF output signal has a high signal-to-noise ratio, excellent frequency purity, and stable gain characteristics.

[0046] In another exemplary embodiment, the KaKu dual-band LNB module further includes a phase-locked loop, a second microstrip filter, and a second amplifier, wherein the output terminal of the phase-locked loop is connected to the input terminal of the second amplifier through the second microstrip filter, and the output terminal of the second amplifier is connected to the first down-conversion branch and the second down-conversion branch respectively.

[0047] In this embodiment, the KaKu dual-band LNB module constructs a high-performance, high-stability common local oscillator signal source through a phase-locked loop (PLL), a second microstrip filter, and a second amplifier, providing core assurance for the dual-band reception function. The module's working principle is as follows: the PLL integrates a voltage-controlled oscillator (VCO), which generates a highly stable, low-phase-noise raw local oscillator signal. This signal is first filtered by the second microstrip filter to remove harmonics and out-of-band spurious signals, purifying the spectrum. Subsequently, the filtered, clean local oscillator signal is sent to the second amplifier for power amplification to provide sufficient driving capability. Finally, the amplified local oscillator signal is simultaneously distributed to the mixers of the first and second down-conversion branches, respectively, to down-convert the Ku-band and Ka-band RF signals to intermediate frequencies.

[0048] This module achieves the following technical effects: First, by sharing a high-performance common local oscillator source for the two down-conversion branches, it fundamentally ensures that the local oscillator signals of the Ka and Ku receiving channels have completely consistent frequency and phase characteristics, greatly improving the consistency of dual-band receiving performance and system reliability. Second, this integrated design avoids configuring a local oscillator source independently for each frequency band, thereby effectively simplifying the circuit structure, reducing the number of components and costs, and facilitating the miniaturization and weight reduction of the module. Finally, the highly stable local oscillator signal ensures the accuracy of the down-conversion process, helping to obtain a high signal-to-noise ratio and low-distortion intermediate frequency output, meeting the stringent requirements of satellite communication for receiving sensitivity and signal quality.

[0049] In another exemplary embodiment, the intermediate frequency signal conditioning unit includes a low-pass filter and a fifth π-type attenuator; wherein the input terminal of the low-pass filter is connected to the input terminal of the intermediate frequency signal conditioning unit and the input terminal of the fifth π-type attenuator, and the output terminal of the fifth π-type attenuator is output to the intermediate frequency signal conditioning unit to output a Ka or Ku band radio frequency signal down-converted to the intermediate frequency.

[0050] In this embodiment, the intermediate frequency (IF) signal conditioning unit operates as follows: IF signals from the first and second down-conversion branches first enter a low-pass filter. This filter removes high-order harmonics, mixing products, and other high-frequency noise generated during the IF signal conversion process, retaining the required IF signal components. This achieves preliminary purification and spectrum shaping of the IF signal, ensuring its in-band purity. After processing by the low-pass filter, the IF signal is fed into a fifth π-type attenuator. This attenuator precisely controls the amplitude of the IF signal, serving two purposes: first, it matches the input level requirements of subsequent circuits, preventing overload or distortion of subsequent modules due to excessively strong IF signals; second, by adjusting the attenuation, it fine-tunes the gain of the output IF signal, ensuring the stability and consistency of the output IF level under different operating conditions (such as when switching between Ka and Ku bands). Finally, the conditioned IF signal is output from the output of the fifth π-type attenuator, completing the conditioning and output preparation of the Ka or Ku band RF signal down-converted to IF.

[0051] In another exemplary embodiment, the KaKu dual-band feed network includes an integrated Ku-band duplexer and a Ka-band dual-channel filter.

[0052] In this embodiment, the Ka / Ku dual-band feed network integrates both a Ku-band duplexer and a Ka-band dual-channel filter, forming a compact dual-band signal routing system. The network operates as follows: On the receiving path, from the composite Ka / Ku band RF signal received from the shared antenna, the network first uses the Ku-band duplexer to separate the Ku-band received signal and directs it to the Ku LNB module. Simultaneously, the Ka-band portion of the composite signal enters the Ka-band dual-channel filter, which further isolates the Ka-band received signal from the transmitted signal, ensuring that the receiving branch only processes the Ka downlink signal from the antenna and feeds it into the Ka LNB module. On the transmitting path, the transmitted signals from the Ka BUC module and the Ku BUC module are input to the feed network. Through the frequency selection and combining effects of the Ka-band dual-channel filter and the Ku-band duplexer, the two transmitted signals are combined and guided to the shared antenna for radiation.

[0053] In summary, this power supply network efficiently achieves the separation, synthesis, and coexistence of transmit and receive signals in the Ka and Ku frequency bands at the shared antenna end through the coordinated frequency selection and signal routing of internal components, thereby supporting the dual-frequency duplex operation of the integrated device.

[0054] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An integrated KaKu dual-frequency transceiver, characterized in that, The all-in-one machine includes: The main body of the all-in-one machine, wherein the main body of the all-in-one machine contains: Intermediate frequency (IF) selective networks are used to select and separate intermediate frequency (IF) signals of different frequencies. The KaKu dual-band BUC module is used to upconvert and amplify the intermediate frequency signal into a Ka or Ku band radio frequency signal. Ka-Ku dual-band LNB module, used to downconvert Ka or Ku band RF signals to intermediate frequency; Ka-Ku dual-band feed network is used to separate and synthesize Ka or Ku band radio frequency signals down-converted to intermediate frequency.

2. The integrated KaKu dual-frequency transceiver according to claim 1, characterized in that, The KaKu dual-band BUC module includes: The gain control and signal conditioning unit has its output terminal electrically connected to a first up-conversion branch and a first power amplifier branch connected in series, and also electrically connected to a second up-conversion branch and a second power amplifier branch connected in series. The gain control and signal conditioning unit is used to condition the intermediate frequency signal from the intermediate frequency selection network; The first upconversion branch is used to upconvert the conditioned intermediate frequency signal to a Ku-band radio frequency signal; The first power amplifier branch is used to amplify the power of the up-converted RF signal to the Ku band; The second upconversion branch is used to upconvert the conditioned intermediate frequency signal to a Ka-band radio frequency signal; The second power amplifier branch is used to amplify the power of the up-converted RF signal to the Ka band.

3. The integrated KaKu dual-frequency transceiver according to claim 2, characterized in that, The gain control and signal conditioning unit includes: The first π-type attenuator, the digitally controlled attenuator, and the high-pass filter are connected in sequence. The output terminal of the high-pass filter is connected to the first terminal of the first switching switch, and the second terminal of the first switching switch is connected to the first up-conversion branch and the second up-conversion branch, respectively. in, The input of the first π-type attenuator is connected to the output of the intermediate frequency selection network to provide a fixed signal attenuation for the intermediate frequency signal; The data attenuator is used to control the amplitude of the intermediate frequency signal to achieve automatic gain controllability; A high-pass filter is used to filter out low-frequency components and out-of-band noise in the intermediate frequency signal, while retaining and shaping the desired intermediate frequency signal. The first switching switch is used to route the intermediate frequency signal required for shaping to the first upconverter branch or the second upconverter branch.

4. The integrated KaKu dual-frequency transceiver according to claim 2, characterized in that, The first up-conversion branch and the second up-conversion branch have the same structure, wherein, The first up-conversion branch includes: The second π-type attenuator, the first operational amplifier, the third π-type attenuator, the analog multiplier, the first filter, the second operational amplifier, and the second filter are connected in sequence. The input terminal of the second π-type attenuator is connected to the output terminal of the first up-conversion branch as the input terminal of the gain control and signal conditioning unit. The output of the second filter is connected to the input of the first power amplifier branch as the output of the first up-conversion branch.

5. The integrated KaKu dual-frequency transceiver according to claim 2, characterized in that, The first power amplification branch and the second power amplification branch have the same structure. The first power amplification branch includes: A third operational amplifier and a fourth operational amplifier are cascaded, wherein the input terminal of the third operational amplifier serves as the input terminal of the first power amplifier branch, and the output terminal of the third operational amplifier is connected to the input terminal of the fourth operational amplifier.

6. The integrated KaKu dual-frequency transceiver according to claim 1, characterized in that, The KaKu dual-band BUC module also includes: Frequency source, first amplifier and second switching switch, in, The output of the frequency source is connected to the first terminal of the second switching switch via an amplifier, and the second terminal of the second switching switch is connected to the first up-conversion branch and the second up-conversion branch respectively.

7. The integrated Ka-Ku dual-frequency transceiver according to claim 1, characterized in that, The KaKu dual-band LNB module includes: The output terminals of the first and second down-conversion branches are simultaneously electrically connected to an intermediate frequency signal conditioning unit. in, The first downconversion branch is used to downconvert Ku-band radio frequency signals to intermediate frequency, and the second downconversion branch is used to downconvert Ka-band radio frequency signals to intermediate frequency.

8. The integrated KaKu dual-frequency transceiver according to claim 7, characterized in that, The first down-converter branch and the second down-converter branch have the same structure. The first down-converter branch includes: The first microstrip filter, the analog multiplier, the fourth π-type attenuator, the fifth operational amplifier, the bandpass filter, and the sixth operational amplifier are connected in sequence. in, The input terminal of the first microstrip filter is connected to the output terminal of the first low-noise amplification branch as the input terminal of the first down-conversion branch, and the output terminal of the sixth operational amplifier is connected to the input terminal of the intermediate frequency signal conditioning unit as the output terminal of the first down-conversion branch.

9. The integrated KaKu dual-frequency transceiver according to claim 8, characterized in that, The intermediate frequency signal conditioning unit includes: Low-pass filter and fifth π-type attenuator; in, The input terminal of the low-pass filter is connected to the input terminal of the intermediate frequency signal conditioning unit and the input terminal of the fifth π-type attenuator. The output terminal of the fifth π-type attenuator is connected to the output terminal of the intermediate frequency signal conditioning unit to output the Ka or Ku band radio frequency signal down-converted to the intermediate frequency.

10. The integrated Ka-Ku dual-frequency transceiver according to claim 1, characterized in that, The KaKu dual-band power supply network includes: Integrated Ku-band duplexer and Ka-band dual-channel filter.

Images