A 3-channel, small-volume KA frequency converter module

Abstract

This utility model discloses a 3-channel, small-volume Ka-band frequency converter module, relating to the field of microwave signal transmission technology. It includes: a Ka-band multi-stage up-conversion unit, a Ka-band multi-stage down-conversion unit, a first local oscillator unit, and a second local oscillator unit. Both the Ka-band multi-stage up-conversion unit and the Ka-band multi-stage down-conversion unit are three-channel structures, with each channel being a multi-stage mixing structure. The first local oscillator unit includes three up-conversion local oscillator frequency channels, all connected to the multi-stage mixing structure of the Ka-band multi-stage up-conversion unit. The second local oscillator unit includes three down-conversion local oscillator frequency channels, all connected to the multi-stage mixing structure of the Ka-band multi-stage down-conversion unit. This utility model, through its multi-stage mixing structure and local oscillator unit, solves the problems of uneven signal distribution, poor stability, and insufficient frequency synthesis accuracy in traditional frequency converter modules during Ka-band multi-channel operation.

Description

Technical Field

[0001] This utility model relates to the field of microwave signal transmission technology, specifically to a 3-channel small-volume KA frequency converter module. Background Technology

[0002] The KA band typically ranges from 26.5 GHz to 40 GHz, offering a wide bandwidth that supports high-speed data transmission and high-resolution signal processing. As a key electronic component, the KA band frequency converter module has broad application prospects in fields such as satellite communication, millimeter-wave communication, and advanced radar systems. It converts KA band radio frequency signals into signals of other frequencies, or vice versa, thereby achieving signal frequency conversion to meet the signal transmission and processing needs between different system components.

[0003] Existing Ka-band frequency converter modules often face problems such as uneven signal distribution, poor local oscillator signal stability, and insufficient frequency synthesis accuracy when operating in multi-channel mode. Current technologies struggle to balance signal processing accuracy and stability in the high-frequency range of the Ka band, easily leading to high phase noise, long lock-in time, and frequency drift, thus limiting the performance improvement of communication systems in multi-channel and wideband coverage applications. Summary of the Invention

[0004] This invention provides a 3-channel, small-volume KA frequency converter module. By optimizing the multi-stage frequency converter unit, local oscillator unit, and signal processing circuit, it solves the problems of uneven signal distribution, poor local oscillator signal stability, and insufficient frequency synthesis accuracy in the prior art, thus meeting the needs of modern communication systems for miniaturization, multi-channel, and high-precision signal processing.

[0005] This utility model provides a 3-channel small-volume KA frequency converter module, including: a Ka-band multi-level up-conversion unit, a Ka-band multi-level down-conversion unit, a first local oscillator unit and a second local oscillator unit; the first local oscillator unit is connected to the Ka-band multi-level up-conversion unit, and the second local oscillator unit is connected to the Ka-band multi-level down-conversion unit.

[0006] Both the Ka-band multi-stage upconversion unit and the Ka-band multi-stage downconversion unit are three-channel structures, and each channel in the three-channel structure is a multi-stage mixing structure.

[0007] The first local oscillator unit includes three up-conversion local oscillator frequency channels, and all three up-conversion local oscillator frequency channels are connected to the multi-stage mixing structure of the Ka-band multi-stage up-conversion unit;

[0008] The second local oscillator unit includes three down-conversion local oscillator frequency channels, all of which are connected to the multi-stage mixing structure of the Ka-band multi-stage down-conversion unit.

[0009] This invention addresses the problems of large size, uneven signal distribution across multiple channels, poor local oscillator signal stability, and insufficient frequency synthesis accuracy in traditional Ka-band frequency converter modules. It proposes a 3-channel, compact Ka-band frequency converter module that integrates multi-stage up-conversion units, multi-stage down-conversion units, and a local oscillator unit, enabling independent operation of the three channels. The multi-stage up-conversion and down-conversion units, each with three channels and employing a multi-stage mixing structure, perform up-conversion and down-conversion of the signal step-by-step, improving signal conversion accuracy and stability. The first local oscillator unit is used for multi-stage up-conversion, and the second for multi-stage down-conversion. Through a multi-stage phase-locked loop circuit design, an independent and stable local oscillator signal is provided for each stage of up-conversion and down-conversion mixing, supporting wide bandwidth coverage and flexible frequency synthesis. This solves the problems of large size, uneven signal distribution across multiple channels, poor local oscillator signal stability, and insufficient frequency synthesis accuracy in traditional Ka-band frequency converter modules.

[0010] Furthermore: Each upconversion channel of the Ka-band multi-stage upconversion unit includes an intermediate frequency amplifier, an intermediate frequency filter, a first mixer, a first intermediate frequency processing circuit, a second mixer, a second intermediate frequency processing circuit, a third mixer, and an RF output processing circuit connected in sequence.

[0011] Each downconversion channel of the Ka-band multi-stage downconversion unit includes, in sequence, an RF amplifier, an RF filter, a fourth mixer, a first RF processing circuit, a fifth mixer, a second RF processing circuit, a sixth mixer, and an intermediate frequency output processing circuit.

[0012] This invention designs a Ka-band multi-stage upconversion unit and a Ka-band multi-stage downconversion unit using a step-by-step mixing method. Through multi-stage mixing, it gradually realizes the conversion of intermediate frequency signals to Ka-band signals and Ka-band signals to intermediate frequency signals. Through multi-stage amplification, filtering, and mixing, it improves the accuracy and stability of signal conversion, ensuring high-quality output of the signal after multiple frequency conversions, and adapting to the frequency requirements of different application scenarios. The Ka-band multi-stage upconversion unit and Ka-band multi-stage downconversion unit of this application can solve the problems of signal distortion, interference, and insufficient frequency conversion flexibility in the multi-stage frequency conversion process of traditional frequency conversion modules, and meet the high precision and high stability requirements of modern communication systems for high-frequency signal conversion.

[0013] Further: the first intermediate frequency (IF) processing circuit and the second IF processing circuit include an IF amplifier, a bandpass filter, an impedance matching network, and an isolator connected in sequence; the radio frequency (RF) processing circuit includes an RF amplifier, an RF bandpass filter, an RF impedance matching network, an RF isolator, and an RF output port connected in sequence;

[0014] The first and second radio frequency processing circuits include an impedance matching network, a low-noise amplifier, and a bandpass filter connected in sequence; the intermediate frequency processing circuit includes a bandpass filter, an intermediate frequency impedance matching network, and a radio frequency output port connected in sequence.

[0015] This invention addresses the problems of low efficiency, poor quality, and weak anti-interference capability in signal processing of traditional frequency converter modules. It designs the circuit connection between mixers based on amplifiers, filters, impedance matching networks, and isolators, ensuring high-fidelity signal propagation between mixers, improving signal quality and stability. Simultaneously, impedance matching and isolators reduce the impact of reflections between mixer signals on the signal itself, as well as the impact of external noise on mixing quality, improving the anti-interference capability of up-conversion and down-conversion, and meeting the demands of modern communication systems for high efficiency and reliability in signal processing.

[0016] Furthermore, both the first local oscillator unit and the second local oscillator unit include a clock signal generation unit, a first phase-locked loop unit, a second phase-locked loop unit, and a third phase-locked loop unit respectively connected to the clock signal generation unit, a first local oscillator signal processing circuit connected to the first phase-locked loop unit, a second local oscillator signal processing circuit connected to the second phase-locked loop unit, and a third local oscillator signal processing circuit connected to the third phase-locked loop unit.

[0017] This application integrates a clock signal generation unit, three phase-locked loop (PLL) units, and a local oscillator (LO) signal processing circuit corresponding to each PLL unit. It achieves high-precision generation and stable output of multi-channel LO signals, meets the frequency requirements of different channels, solves the problems of poor signal stability and insufficient frequency flexibility of traditional LO source units in multi-channel applications, and meets the requirements of modern communication systems for high-frequency multi-channel operation.

[0018] Furthermore, the clock signal generation unit includes a crystal oscillator, a power supply filter circuit, a temperature compensation circuit, and a signal distributor connected in sequence.

[0019] This application uses a power supply filtering circuit to remove power supply noise and ensure the purity of the clock signal. A temperature compensation circuit reduces the impact of temperature fluctuations on the stability of the clock signal and improves the system's adaptability to different temperature environments. The signal distributor evenly distributes the clock signal and transmits it to different phase-locked loop units to ensure the signal synchronization of the multi-channel local oscillator signal, solving the problems of low stability, weak anti-interference ability and insufficient consistency of multi-channel signals in traditional clock signal generation units.

[0020] Further: The first phase-locked loop unit includes a frequency divider, a first phase detector, a loop filter, an automatic gain control circuit, and a first voltage-controlled oscillator connected in sequence. The output terminal of the first voltage-controlled oscillator is connected to the first local oscillator signal processing circuit and the input terminal of the frequency divider, respectively. The output terminal of the frequency divider is connected to the first phase detector.

[0021] The first phase-locked loop unit of this invention introduces an automatic gain control circuit, which can automatically adjust the loop gain to ensure a stable gain level under different operating conditions, thereby improving the accuracy and stability of frequency synthesis. The coordinated operation of the frequency divider, phase detector, loop filter and voltage-controlled oscillator can reduce phase noise, improve signal quality, enhance the performance of the phase-locked loop in the high-frequency band, and solve the problems of slow frequency switching speed and long locking time of traditional phase-locked loops in multi-channel applications.

[0022] Further: The second phase-locked loop unit includes a prescaler and a main scaler connected in sequence, a second phase detector, a loop filter, an automatic gain control circuit, and a Ku-band dielectric oscillator connected in sequence. The output terminal of the Ku-band dielectric oscillator is connected to the input terminal of the second local oscillator signal processing circuit and the prescaler, respectively, and the output terminal of the main scaler is connected to the second phase detector.

[0023] This invention addresses the problems of low frequency synthesis accuracy, high phase noise, and long locking time in traditional phase-locked loops (PLLs) used in high-frequency applications by proposing a second PLL unit. A large division ratio is achieved through a combination of a prescaler and a main scaler. Combined with a phase detector, loop filter, automatic gain control circuit, and Ku-band dielectric oscillator, this improves the accuracy and stability of frequency synthesis, reduces phase noise, and accelerates locking speed, thus solving the performance deficiencies of traditional PLLs in high-frequency applications.

[0024] Furthermore, the third phase-locked loop unit includes a dual-mode prescaler and an A / B timer connected in sequence, a third phase detector, an active proportional-integral filter, an automatic gain control circuit, and a second voltage-controlled oscillator connected in sequence. The output terminal of the second voltage-controlled oscillator is connected to the input terminal of the third local oscillator signal processing circuit and the dual-mode prescaler, respectively. The output terminal of the A / B timer is connected to the third phase detector.

[0025] This invention addresses the requirements of Ka-band signals by designing a third phase-locked loop (PLL) unit based on a dual-mode prescaler, an A / B timer, a phase detector, an active proportional-integral (AIO) filter, an automatic gain control (AGC) circuit, and a voltage-controlled oscillator (VCO). Through the coordinated operation of the dual-mode prescaler and the A / B timer, flexible frequency division and accurate phase detection are ensured, widening the frequency synthesis range. The AIO filter reduces phase noise, and the AGC circuit ensures stable signal gain within the loop. This solves the problems of low frequency synthesis accuracy, high phase noise, and insufficient stability that traditional PLLs suffer from when applied to scenarios with extremely high frequency synthesis requirements.

[0026] Furthermore: both the first and second local oscillator signal processing circuits include a buffer amplifier and an isolator that amplify the signal in sequence; the third local oscillator signal processing circuit includes a buffer amplifier, a ×3 frequency multiplier, a Ka bandpass filter, a power amplifier, and an isolator connected in sequence.

[0027] The first and second local oscillator signal processing circuits use buffer amplifiers and isolators to amplify and isolate the signal, ensuring high-fidelity transmission. The third local oscillator signal processing circuit, designed for the Ka band, employs a combination of a buffer amplifier, a ×3 frequency multiplier, a Ka bandpass filter, a power amplifier, and an isolator. The ×3 frequency multiplier and Ka bandpass filter ensure the purity and stability of the signal in the Ka band, reducing phase noise and interference. This solves the problems of poor signal quality, limited frequency band adaptability, and high interference inherent in traditional local oscillator signal processing circuits in Ka band applications.

[0028] Furthermore: the first local oscillator unit is connected to the three channels of the Ka-band multi-stage up-converter unit through a three-way power divider; the second local oscillator unit is connected to the three channels of the Ka-band multi-stage down-converter unit through a three-way power divider.

[0029] By connecting the first local oscillator unit to the Ka-band multi-stage up-conversion unit and the second local oscillator unit to the Ka-band multi-stage down-conversion unit through a three-way power divider, the local oscillator signal is evenly distributed and stably transmitted, ensuring the consistency of the amplitude and phase of the signal in each channel and improving the stability and reliability of the multi-channel system.

[0030] The technical solution provided by this utility model has at least the following technical effects or advantages:

[0031] This utility model presents a 3-channel, compact Ka-band frequency converter module. Through multi-stage frequency conversion units, local oscillator units, and signal processing circuits, it achieves miniaturization and a multi-channel structure, improving the accuracy and stability of signal conversion. The design of multi-stage mixing and processing circuits reduces signal distortion and interference, ensuring high-quality signal transmission after multiple frequency conversions. The phase-locked loop unit and local oscillator signal processing circuit provide the system with a stable and low-phase-noise local oscillator signal, supporting wide bandwidth coverage and flexible frequency synthesis. It solves the problems of uneven signal distribution, poor local oscillator signal stability, and insufficient frequency synthesis accuracy in traditional Ka-band frequency converter modules during multi-channel operation, meeting the needs of modern communication systems for miniaturization, multi-channel operation, and high-precision signal processing. Attached Figure Description

[0032] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0033] Figure 1 This is a schematic diagram of the structure of the 3-channel small-volume KA frequency converter module in this utility model;

[0034] Figure 2 This is a schematic diagram of the upconversion channel in the Ka-band multi-stage upconversion unit of this utility model;

[0035] Figure 3 This is a schematic diagram of the downconversion channel in the Ka-band multi-stage downconversion unit of this utility model;

[0036] Figure 4 This is a schematic diagram of the structure of the first and second local vibration source units in this utility model. Detailed Implementation

[0037] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] Example 1

[0040] like Figure 1As shown, this utility model provides a 3-channel small-volume KA frequency converter module, including: a Ka-band multi-level up-conversion unit, a Ka-band multi-level down-conversion unit, a first local oscillator unit and a second local oscillator unit; the first local oscillator unit is connected to the Ka-band multi-level up-conversion unit, and the second local oscillator unit is connected to the Ka-band multi-level down-conversion unit.

[0041] Among them, the Ka-band multi-stage upconversion unit and the Ka-band multi-stage downconversion unit are both three-channel structures, which can be referred to as the first upconversion channel, the second upconversion channel, the third upconversion channel, the first downconversion channel, the second downconversion channel and the third downconversion channel. Each channel in the three-channel structure is a multi-stage mixing structure.

[0042] The first local oscillator unit includes three up-conversion local oscillator frequency channels. All three up-conversion local oscillator frequency channels are connected to the multi-stage mixing structure of the Ka-band multi-stage up-conversion unit. Specifically, the three up-conversion local oscillator frequency channels of the first local oscillator unit are connected to the three channels of the Ka-band multi-stage up-conversion unit through three power dividers.

[0043] The second local oscillator unit includes three down-conversion local oscillator frequency channels. All three down-conversion local oscillator frequency channels are connected to the multi-stage mixing structure of the Ka-band multi-stage down-conversion unit. Specifically, the three down-conversion local oscillator frequency channels of the second local oscillator unit are connected to the three channels of the Ka-band multi-stage down-conversion unit through a three-way power divider.

[0044] In this invention, the three up-conversion channels of the first local oscillator unit are respectively connected to the three mixers in the Ka-band multi-stage up-conversion unit, and the three up-conversion channels of the second local oscillator unit are respectively connected to the three mixers in the Ka-band multi-stage down-conversion unit. This achieves uniform distribution and stable transmission of the local oscillator signal, ensures the consistency of the amplitude and phase of the channel signals in the Ka-band multi-stage up-conversion unit and the Ka-band multi-stage down-conversion unit, and improves the stability and reliability of the multi-channel system.

[0045] To address the problems of large size, uneven signal distribution across multiple channels, poor local oscillator signal stability, and insufficient frequency synthesis accuracy in traditional Ka-band frequency converter modules, this invention proposes a 3-channel, compact Ka-band frequency converter module. This module includes a multi-stage Ka-band up-conversion unit, a multi-stage Ka-band down-conversion unit, a first local oscillator unit, and a second local oscillator unit, enabling independent operation of all three channels. The multi-stage up-conversion and down-conversion units, with their three-channel design and multi-stage mixing structure, progressively up-convert and down-convert the signal, improving efficiency. High signal conversion accuracy and stability; the three phase-locked loop units in the first local oscillator unit provide independent and stable local oscillator signals for each stage of the mixer in each channel of the Ka-band multi-stage up-conversion unit, and the three phase-locked loop units in the second local oscillator unit provide independent and stable local oscillator signals for each stage of the mixer in each channel of the Ka-band multi-stage down-conversion unit. It supports wide bandwidth coverage and flexible frequency synthesis, solving the problems of uneven multi-channel signal distribution, poor local oscillator signal stability, and insufficient frequency synthesis accuracy in traditional Ka-band frequency converter modules.

[0046] In this utility model, such as Figure 2 As shown, each upconversion channel of the Ka-band multi-stage upconversion unit includes, in sequence, an intermediate frequency amplifier, an intermediate frequency filter, a first mixer, a first intermediate frequency processing circuit, a second mixer, a second intermediate frequency processing circuit, a third mixer, and an RF output processing circuit; as shown... Figure 3 As shown, each downconversion channel of the Ka-band multi-stage downconversion unit includes a radio frequency amplifier, a radio frequency filter, a fourth mixer, a first radio frequency processing circuit, a fifth mixer, a second radio frequency processing circuit, a sixth mixer, and an intermediate frequency output processing circuit connected in sequence.

[0047] The first and second intermediate frequency (IF) processing circuits include an IF amplifier, a bandpass filter, an impedance matching network, and an isolator connected in sequence; the radio frequency (RF) processing circuit includes an RF amplifier, an RF bandpass filter, an RF impedance matching network, an RF isolator, and an RF output port connected in sequence; the first and second RF processing circuits include an impedance matching network, a low-noise amplifier, and a bandpass filter connected in sequence; and the IF processing circuit includes a bandpass filter, an IF impedance matching network, and an RF output port connected in sequence.

[0048] The design of Ka-band multi-stage upconversion and downconversion units utilizes a step-by-step mixing approach. Through multi-stage mixing, a 100MHz intermediate frequency signal can be progressively upconverted to 2GHz, 8GHz, and 30GHz, ultimately transforming into a Ka-band signal, and vice versa. The multi-stage amplification, filtering, and mixing of the mixer circuitry enhances signal conversion accuracy and stability, ensuring high-quality output after multiple conversions and adapting to the frequency requirements of various applications. Impedance matching and isolators reduce the impact of signal reflections between mixer signals and external noise on mixing quality, improving the anti-interference capabilities of upconversion and downconversion. This addresses the issues of signal distortion, interference, and insufficient frequency conversion flexibility inherent in traditional frequency conversion modules during multi-stage conversion.

[0049] In this utility model, such as Figure 4 The diagram shows the structure of the first local oscillator unit and the second local oscillator unit. Both the first local oscillator unit and the second local oscillator unit include a clock signal generation unit, a first phase-locked loop unit, a second phase-locked loop unit and a third phase-locked loop unit respectively connected to the clock signal generation unit, a first local oscillator signal processing circuit connected to the first phase-locked loop unit, a second local oscillator signal processing circuit connected to the second phase-locked loop unit, and a third local oscillator signal processing circuit connected to the third phase-locked loop unit.

[0050] This application integrates a clock signal generation unit, three phase-locked loop (PLL) units, and a local oscillator (LO) signal processing circuit corresponding to each PLL unit. It achieves high-precision generation and stable output of multi-channel LO signals, meets the frequency requirements of different channels, solves the problems of poor signal stability and insufficient frequency flexibility of traditional LO source units in multi-channel applications, and meets the requirements of modern communication systems for high-frequency multi-channel operation.

[0051] The clock signal generation unit includes a crystal oscillator, a power supply filter circuit, a temperature compensation circuit, and a signal distributor connected in sequence.

[0052] Power supply noise is removed by a power supply filter circuit to ensure the purity of the clock signal; the temperature compensation circuit reduces the impact of temperature fluctuations on the stability of the clock signal and improves the system's adaptability to different temperature environments; the signal distributor evenly distributes the clock signal and transmits it to different phase-locked loop units to ensure the signal synchronization of multi-channel local oscillator signals.

[0053] The first phase-locked loop unit includes a frequency divider, a first phase detector, a loop filter, an automatic gain control circuit, and a first voltage-controlled oscillator connected in sequence. The output of the first voltage-controlled oscillator is connected to the input of the first local oscillator signal processing circuit and the frequency divider, respectively. The output of the frequency divider is connected to the first phase detector.

[0054] The local oscillator signal generated by the first phase-locked loop in the first local oscillator unit is used for the first mixing in the step-by-step mixing structure of the Ka-band upconversion unit, enabling upconversion of the intermediate frequency signal to the 2GHz band. The local oscillator signal generated by the first phase-locked loop in the second local oscillator unit is used for the third mixing in the step-by-step mixing structure of the Ka-band downconversion unit, enabling downconversion of the 2GHz radio frequency signal to the intermediate frequency signal. A loop filter and frequency divider are used in the 2GHz band design to remove noise and stabilize the voltage. The automatic gain control circuit adjusts the gain according to the signal strength, ensuring that the phase-locked loop operates normally without affecting performance when the signal strength changes. This solves the problem of performance degradation of phase-locked loops caused by traditional noise interference.

[0055] In this invention, the second phase-locked loop unit includes a prescaler and a main scaler connected in sequence, a second phase detector, a loop filter, an automatic gain control circuit, and a Ku-band dielectric oscillator connected in sequence. The output terminal of the Ku-band dielectric oscillator is connected to the input terminal of the second local oscillator signal processing circuit and the prescaler, respectively, and the output terminal of the main scaler is connected to the second phase detector.

[0056] The local oscillator signal generated by the second phase-locked loop in the first local oscillator unit is used for the second mixing in the step-by-step mixing structure of the Ka-band upconversion unit, which can upconvert the intermediate frequency signal to the 8GHz band. The local oscillator signal generated by the second phase-locked loop in the second local oscillator unit is used for the second mixing in the step-by-step mixing structure of the Ka-band downconversion unit, which can downconvert the 8GHz radio frequency signal to the 2GHz band. A Ku-band dielectric oscillator is used to generate a frequency that conforms to 8GHz. At the same time, the automatic gain control circuit can stabilize the performance of the phase-locked loop by changing the signal strength. The combined design of the main frequency divider and the pre-frequency divider can process high-frequency signals, achieve a large frequency division ratio, reduce the operating frequency of the subsequent phase detector, and improve the accuracy of frequency synthesis. The second phase-locked loop unit achieves higher frequency synthesis accuracy and better stability in the high-frequency band, solving the problems of high phase noise, long locking time and poor frequency stability of traditional phase-locked loops in the high-frequency band.

[0057] In this invention, the third phase-locked loop unit includes a dual-mode prescaler and an A / B timer connected in sequence, a third phase detector, an active proportional-integral filter, an automatic gain control circuit, and a second voltage-controlled oscillator connected in sequence. The output terminal of the second voltage-controlled oscillator is connected to the input terminal of the third local oscillator signal processing circuit and the dual-mode prescaler, respectively. The output terminal of the A / B timer is connected to the third phase detector.

[0058] This invention addresses the requirements of Ka-band signals by designing a third phase-locked loop (PLL) unit based on a dual-mode prescaler, an A / B timer, a phase detector, an active proportional-integral (AIO) filter, an automatic gain control (AGC) circuit, and a voltage-controlled oscillator (VCO). Through the coordinated operation of the dual-mode prescaler and the A / B timer, flexible frequency division and accurate phase detection are ensured, widening the frequency synthesis range. The AIO filter reduces phase noise, and the AGC circuit ensures stable signal gain within the loop. This solves the problems of low frequency synthesis accuracy, high phase noise, and insufficient stability that traditional PLLs suffer from when applied to scenarios with extremely high frequency synthesis requirements.

[0059] The local oscillator signal generated by the third phase-locked loop in the first local oscillator unit is used for the third mixing in the step-by-step mixing structure of the Ka-band upconversion unit, which can upconvert the intermediate frequency signal to the 30GHz band. The local oscillator signal generated by the third phase-locked loop in the second local oscillator unit is used for the first mixing in the step-by-step mixing structure of the Ka-band downconversion unit, which can downconvert the 30GHz radio frequency signal to the 8GHz band. The third phase-locked loop unit uses a dual-mode prescaler to provide a flexible division ratio, which can handle a wide range of input frequencies. An A / B timer ensures accurate phase comparison, an active proportional-integral filter reduces phase noise, an automatic gain control circuit maintains the stability of the phase-locked loop gain, and a second voltage-controlled oscillator provides a highly stable output signal. This solves the problems of low frequency synthesis accuracy, high phase noise, and insufficient stability that traditional phase-locked loops encounter when applied to scenarios with extremely high frequency synthesis requirements.

[0060] In this invention, the first local oscillator signal processing circuit and the second local oscillator signal processing circuit both include a buffer amplifier and an isolator that amplify the signal in sequence; the third local oscillator signal processing circuit includes a buffer amplifier, a ×3 frequency multiplier, a Ka bandpass filter, a power amplifier, and an isolator connected in sequence.

[0061] The first and second local oscillator signal processing circuits use buffer amplifiers and isolators to amplify and isolate the signal, ensuring high-fidelity transmission. The third local oscillator signal processing circuit, designed for the Ka band, employs a combination of a buffer amplifier, a ×3 frequency multiplier, a Ka bandpass filter, a power amplifier, and an isolator. The ×3 frequency multiplier and Ka bandpass filter ensure the purity and stability of the signal in the Ka band, reducing phase noise and interference. This solves the problems of poor signal quality, limited frequency band adaptability, and high interference inherent in traditional local oscillator signal processing circuits in Ka band applications.

[0062] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0063] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A 3-channel, compact KA frequency converter module, characterized in that, include: Ka-band multi-stage up-conversion unit, Ka-band multi-stage down-conversion unit, first local oscillator unit and second local oscillator unit; The first local oscillator unit is connected to the Ka-band multi-stage up-conversion unit, and the second local oscillator unit is connected to the Ka-band multi-stage down-conversion unit. Both the Ka-band multi-stage upconversion unit and the Ka-band multi-stage downconversion unit are three-channel structures, and each channel in the three-channel structure is a multi-stage mixing structure. The first local oscillator unit includes three up-conversion local oscillator frequency channels, and all three up-conversion local oscillator frequency channels are connected to the multi-stage mixing structure of the Ka-band multi-stage up-conversion unit; The second local oscillator unit includes three down-conversion local oscillator frequency channels, all of which are connected to the multi-stage mixing structure of the Ka-band multi-stage down-conversion unit.

2. The 3-channel small-volume KA frequency converter module according to claim 1, characterized in that, Each upconversion channel of the Ka-band multi-stage upconversion unit includes an intermediate frequency amplifier, an intermediate frequency filter, a first mixer, a first intermediate frequency processing circuit, a second mixer, a second intermediate frequency processing circuit, a third mixer, and an RF output processing circuit connected in sequence. Each downconversion channel of the Ka-band multi-stage downconversion unit includes, in sequence, an RF amplifier, an RF filter, a fourth mixer, a first RF processing circuit, a fifth mixer, a second RF processing circuit, a sixth mixer, and an intermediate frequency output processing circuit.

3. A 3-channel, small-volume KA frequency converter module according to claim 2, characterized in that, The first and second intermediate frequency (IF) processing circuits include an IF amplifier, a bandpass filter, an impedance matching network, and an isolator connected in sequence; the radio frequency (RF) processing circuit includes an RF amplifier, an RF bandpass filter, an RF impedance matching network, an RF isolator, and an RF output port connected in sequence. The first and second radio frequency processing circuits include an impedance matching network, a low-noise amplifier, and a bandpass filter connected in sequence; the intermediate frequency processing circuit includes a bandpass filter, an intermediate frequency impedance matching network, and a radio frequency output port connected in sequence.

4. A 3-channel, small-volume KA frequency converter module according to claim 1, characterized in that, The first local oscillator unit and the second local oscillator unit each include a clock signal generation unit, a first phase-locked loop unit, a second phase-locked loop unit and a third phase-locked loop unit respectively connected to the clock signal generation unit, a first local oscillator signal processing circuit connected to the first phase-locked loop unit, a second local oscillator signal processing circuit connected to the second phase-locked loop unit, and a third local oscillator signal processing circuit connected to the third phase-locked loop unit.

5. A 3-channel, small-volume KA frequency converter module according to claim 4, characterized in that, The clock signal generation unit includes a crystal oscillator, a power supply filter circuit, a temperature compensation circuit, and a signal distributor connected in sequence.

6. A 3-channel, small-volume KA frequency converter module according to claim 4, characterized in that, The first phase-locked loop unit includes a frequency divider, a first phase detector, a loop filter, an automatic gain control circuit, and a first voltage-controlled oscillator connected in sequence. The output terminal of the first voltage-controlled oscillator is connected to the first local oscillator signal processing circuit and the input terminal of the frequency divider, respectively. The output terminal of the frequency divider is connected to the first phase detector.

7. A 3-channel small-volume KA frequency converter module according to claim 4, characterized in that, The second phase-locked loop unit includes a prescaler and a main scaler connected in sequence, a second phase detector, a loop filter, an automatic gain control circuit, and a Ku-band dielectric oscillator connected in sequence. The output terminal of the Ku-band dielectric oscillator is connected to the input terminal of the second local oscillator signal processing circuit and the prescaler, respectively, and the output terminal of the main scaler is connected to the second phase detector.

8. A 3-channel, small-volume KA frequency converter module according to claim 4, characterized in that, The third phase-locked loop unit includes a dual-mode prescaler and an A / B timer connected in sequence, a third phase detector, an active proportional-integral filter, an automatic gain control circuit, and a second voltage-controlled oscillator connected in sequence. The output terminal of the second voltage-controlled oscillator is connected to the input terminal of the third local oscillator signal processing circuit and the dual-mode prescaler, respectively. The output terminal of the A / B timer is connected to the third phase detector.

9. A 3-channel, small-volume KA frequency converter module according to claim 4, characterized in that, The first and second local oscillator signal processing circuits each include a buffer amplifier and an isolator that amplify the signal in sequence; the third local oscillator signal processing circuit includes a buffer amplifier, a ×3 frequency multiplier, a Ka bandpass filter, a power amplifier, and an isolator connected in sequence.

10. A 3-channel, small-volume KA frequency converter module according to claim 1, characterized in that, The first local oscillator unit is connected to the three channels of the Ka-band multi-stage up-conversion unit via a three-way power divider; the second local oscillator unit is connected to the three channels of the Ka-band multi-stage down-conversion unit via a three-way power divider.

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