Broadband millimeter wave frequency agile source

Abstract

The application discloses a millimeter wave frequency agile source, comprising a phase-locked source module, a five-frequency division module, a primary frequency conversion filtering module, a four-frequency multiplication module, a secondary frequency conversion filtering module, a clock module and a control module. The phase-locked source module outputs three signals, the first output is connected with the primary frequency conversion module, the second output is connected with the five-frequency division module, and the third output is connected with the four-frequency multiplication module. The five-frequency division module output is connected with the primary frequency conversion module, the clock module output is connected with the four-frequency multiplication module, the four-frequency multiplication module and the primary frequency conversion module output are connected with the secondary frequency conversion module, and the secondary frequency conversion module outputs millimeter wave signals. The application overcomes the shortcomings of complex layout design, large debugging difficulty, large volume and inadaptability to miniaturization and integration of the conventional millimeter wave frequency agile source.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of frequency source design, and particularly relates to a wideband millimeter wave frequency agile source. BACKGROUND

[0002] With the rapid development of electronic countermeasures, microwave communication remote sensing, radar and guidance, etc., the millimeter wave frequency source has been widely applied to microwave systems, and as a core component, the performance directly affects the overall performance of the system.

[0003] The traditional millimeter wave frequency agile source is often realized by using a comb spectrum generator, and a variety of filters are needed to obtain the local oscillator signal and the intermediate frequency signal in the realization process. The circuit structure layout is complex, the module volume is large, the debugging difficulty is large, and it cannot be widely used. SUMMARY

[0004] The application aims to provide a wideband millimeter wave frequency agile source, which overcomes the shortcomings of the traditional millimeter wave frequency agile source, such as complex layout design, large debugging difficulty, large volume, and inadaptation to the miniaturization and integration requirements of missile-borne electronic jamming equipment.

[0005] The technical solution of the application is as follows: a millimeter wave frequency agile source, comprising a phase-locked source module, a five-frequency division module, a primary frequency conversion filter module, a four-frequency multiplication module, a secondary frequency conversion filter module, a clock module and a control module. The phase-locked source module outputs three signals, the first output is connected to the primary frequency conversion module, the second output is connected to the five-frequency division module, and the third output is connected to the four-frequency multiplication module. The five-frequency division module output is connected to the primary frequency conversion module, the clock module output is connected to the four-frequency multiplication module, and the four-frequency multiplication module and the primary frequency conversion module output are connected to the secondary frequency conversion module to output a millimeter wave signal.

[0006] The phase-locked source module outputs three signals. One signal is used as the local oscillator signal of the primary frequency conversion module, and the other signal is input to the frequency division module and filtered to be used as the intermediate frequency signal of the primary frequency conversion module. The Ku band radio frequency signal output by the primary frequency conversion is used as the intermediate frequency signal of the secondary frequency conversion. The third signal of the phase-locked source module is input to the frequency multiplication module. The clock module outputs two signals, one of which is directly output as a clock signal after being divided by two, and the other signal is input to the frequency multiplication module. The signal input to the frequency multiplication module is quadrupled to be used as the local oscillator signal of the secondary frequency conversion filter module, so that a millimeter wave signal is output after secondary frequency conversion. The control module provides power, reference signal and control signal. The layout of the application is realized by using front micro-assembly chip integration technology and back PCB multilayer board technology. Different microwave signals are isolated in different cavities, and signal interconnection is realized by microwave insulator or radio frequency connector.

[0007] Compared with the prior art, the present application has the following advantages: the present application directly outputs a single frequency point signal by using a phase-locked source circuit unit, no comb spectrum generator is used, the use of multiple narrow-band band-pass filters is avoided, the flexibility of circuit layout is increased, the difficulty of circuit layout is reduced, the volume of the module is reduced, and in particular, a frequency conversion scheme is reasonably designed, an intermediate frequency signal of primary frequency conversion is provided by five frequency division, a local oscillator signal of secondary frequency conversion is provided by frequency multiplication filtering, the multiplexing of all phase-locked sources is realized, the number of phase-locked source circuit units is reduced, the interference between different signals is reduced, the circuit layout is further simplified, the volume is further reduced, and the power consumption and cost of the module are reduced; and finally, a wideband, small-volume, fast-frequency hopping high-reliability millimeter wave frequency source is realized. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a scheme block diagram of the millimeter wave frequency hopping frequency source.

[0009] Figure 2 is a schematic diagram of the millimeter wave frequency hopping frequency source.

[0010] Figure 3 is a front view layout of the millimeter wave frequency hopping frequency source.

[0011] Figure 4 is a back view layout of the millimeter wave frequency hopping frequency source. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0013] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0014] In addition, the description of “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first”, “second” can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of “multiple” is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0015] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; "connection" can be mechanical connection, or electrical connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0016] In addition, the technical solutions among various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0017] The specific embodiments, technical difficulties and points of the present application will be further introduced below in combination with the design examples.

[0018] In combination Figure 1 , the millimeter wave frequency source described in the present application includes a phase-locked source module, a five-frequency module, a primary frequency conversion filter module, a four-frequency module, a secondary frequency conversion filter module, a clock module and a control module. The phase-locked source module outputs three signals, the first output is connected to the primary frequency conversion module, the second output is connected to the five-frequency module, and the third output is connected to the four-frequency module. The five-frequency module output is connected to the primary frequency conversion module, the clock module output is connected to the four-frequency module, and the four-frequency module and the primary frequency conversion module output are connected to the secondary frequency conversion module to output millimeter wave signals.

[0019] In combination Figure 2 , the phase-locked source module includes five phase-locked source circuit units, eleven single-pole double-throw switches, six power dividers, an amplifier and a filter. The five phase-locked source circuit units are sequentially first phase-locked source circuit unit to fifth phase-locked source circuit unit. The first phase-locked source circuit unit to the fourth phase-locked source circuit unit are the same in structure, and each includes a phase-locked source, a power divider and two single-pole single-throw switches. The fifth phase-locked loop circuit unit includes a fifth phase-locked source, two power dividers and three single-pole single-throw switches.

[0020] The first four phase-locked sources each output one frequency point, including 10GHz, 11GHz, 13GHz and 14GHz, and the power division outputs two paths, and so on, the fourth phase-locked source is divided into two paths by the fourth power divider, the first phase-locked source is divided into two paths by the first power divider, each path uses a single-pole single-throw switch to control the on-off of a signal, the fifth phase-locked source outputs 12GHz, and the fifth power divider and the sixth power divider divide the signal into three paths, each path uses a single-pole single-throw switch to control the on-off of a signal. One path of each of the above five frequency points is selected through four single-pole double-throw switches, and the on-off of the signal is selected through the linkage of the single-pole single-throw switch, and one frequency point is selected and output each time, and the signal is amplified and filtered to serve as a local oscillator signal of a frequency conversion filter module; meanwhile, another path of the signal is selected through four single-pole double-throw switches, and the on-off of the signal is selected through the linkage of the single-pole single-throw switch, and one frequency point is selected and output each time to a frequency division module. The third path of the signal divided by the fifth phase-locked source serves as a third path output of the phase-locked source module.

[0021] The frequency division module is composed of a frequency divider and a low-pass filter, and the local oscillator signal output by the phase-locked source module is filtered by the frequency division to obtain five frequency points including 2GHz, 2.2GHz, 2.4GHz, 2.6GHz and 2.8GHz as intermediate frequency signals.

[0022] In this way, the local oscillator signals and the intermediate frequency signals of different frequency points are selected and input to a frequency conversion module, the frequency conversion module is composed of a mixer, an amplifier and a first switch filter group, the switch filter group is divided into eight sections, each section has a passband bandwidth of 1GHz, and the intermodulation signals of the mixer are filtered out. After the mixer mixes the local oscillator signals and the intermediate frequency signals of different frequency points, a radio frequency signal with a frequency range of 8-16GHz and a step of 0.2GHz is obtained, and the radio frequency signal is input to a secondary frequency conversion module as a secondary frequency conversion intermediate frequency signal.

[0023] The key point of the above design is the selected frequency conversion scheme, the selected local oscillator signal frequency points are divided by five to obtain exactly five frequency points required by the intermediate frequency signals, and all the required radio frequency signal frequency points can be obtained through frequency conversion. In this way, five phase-locked sources are avoided to serve as intermediate frequency signals. From the implementation effect, on the one hand, the signal types are reduced, the mutual interference in the case of multiple signals is avoided, the debugging difficulty is reduced, the overall performance of the module is improved, on the other hand, the use of devices is reduced, the circuit layout difficulty is reduced, the module size is reduced, the power consumption is reduced, and the cost is saved.

[0024] The clock source module is composed of a phase-locked source circuit, a seventh power divider, a single-pole single-throw switch and a frequency divider. The phase-locked source circuit outputs a 10GHz signal, the seventh power divider divides the signal into two paths, one path of the signal is filtered by the frequency divider to output a 5GHz signal as a clock signal, and the other path of the signal is controlled by the single-pole single-throw switch to be turned on and off and output to a frequency multiplication module.

[0025] The quadruple frequency module is composed of single-pole double-throw switch, frequency multiplier, filter and amplifier. The 10GHz signal output by the clock source module and the 12GHz signal output by the fifth phase-locked loop source are input to the quadruple frequency module. A frequency point is selected through the linkage of the single-pole single-throw switch of the phase-locked loop source module and the clock source module and the single-pole double-throw switch of the quadruple frequency module. After quadruple frequency filtering and amplification, the local oscillator signals of 40GHz and 48GHz are obtained. After amplification, they are input to the secondary frequency conversion filtering module.

[0026] The above design selects a reasonable secondary frequency conversion scheme. The clock source and the fifth phase-locked loop source are quadrupled as the local oscillator signals of secondary frequency conversion, and the phase-locked loop source multiplexing is realized again.

[0027] The secondary frequency conversion module is composed of a millimeter wave mixer and a second switch filter group. The intermediate frequency signal of 8-16GHz is up-converted to obtain a millimeter wave signal with a frequency range of 24-40GHz and a step of 200MHz. After filtering by the switch filter group, the signal is output.

[0028] The control module includes a voltage stabilizing filter circuit, a reference power division circuit and a control circuit. The voltage stabilizing filter circuit realizes power supply for the entire assembly. The reference power division circuit is composed of inductors, capacitors and resistors to form a 100MHz reference power division circuit, which provides a reference signal to the phase-locked loop source module and the clock module. The control circuit realizes the control of each switch of the entire assembly and the selection of the frequency band of the switch filter group through CPLD decoding.

[0029] In combination with Figure 3 and Figure 4 , the assembly adopts a hybrid assembly process of electrical assembly and micro-assembly. The phase-locked loop source adopts an electrical assembly process and is arranged on the front surface of the assembly. It shields interference through a cavity. Other microwave devices adopt a micro-assembly process to realize chip integration. The voltage stabilizing filter circuit, the control circuit and the reference power division circuit are arranged on the back surface of the assembly. Through reasonable layout, mutual interference of the three functional circuits is avoided, and the interconnection with the front circuit is realized through a pin insulator.

[0030] The size of the millimeter wave agile frequency source assembly is 155mm×66mm×10mm, which fully meets the miniaturization requirements of missile-borne equipment and has been widely used in multiple projects.

[0031] The embodiment of the application guarantees the isolation between each frequency point and the frequency hopping time control within 100ns through linkage selection of single-pole single-throw switch and single-pole double-throw switch; the five frequency points of 10GHz, 11GHz, 12GH, 13GHz and 14GHz are power-divided and output, one way is divided by five as an intermediate frequency signal, so that the number of phase-locked sources is halved; the 10GHz clock signal and the local oscillator 12GHz signal are power-divided and one way is quadrupled as a local oscillator signal of secondary frequency conversion, so as to further reduce the number of phase-locked sources. The millimeter wave frequency agile frequency source skillfully selects the frequency points required for frequency conversion and the frequency division and frequency multiplication times to realize the multiplexing of all phase-locked sources, on the one hand, reduces the signal types to avoid mutual interference, simplifies the design and debugging difficulty, improves the overall performance of the module, on the other hand, simplifies the circuit design layout, saves the layout space, reduces the module volume and reduces the module research and development cost.

Claims

1. A millimeter wave frequency agile source, characterized by: The phase-locked source module, the five division module, the primary frequency conversion filter module, the four times frequency module, the secondary frequency conversion filter module, the clock module and the control module are included. The phase-locked source module outputs three signals, the first output is connected with the primary frequency conversion module, the second output is connected with the five division module, and the third output is connected with the four times frequency module. The five division module outputs are connected with the primary frequency conversion module, the clock module outputs are connected with the four times frequency module, and the four times frequency module and the primary frequency conversion module outputs are connected with the secondary frequency conversion module to output the millimeter wave signal through secondary frequency conversion. The phase-locked source module includes an amplifier, a filter, five phase-locked source circuit units, eleven single-pole double-throw switches and six power dividers. The five phase-locked source circuit units are sequentially the first phase-locked source circuit unit to the fifth phase-locked source circuit unit. The first phase-locked source circuit unit to the fourth phase-locked source circuit unit are the same in structure and each includes a phase-locked source, one power divider and two single-pole single-throw switches. The fifth phase-locked source circuit unit includes a fifth phase-locked source, two power dividers and three single-pole single-throw switches. The first four phase-locked sources each output one frequency point, including 10GHz, 11GHz, 13GHz and 14GHz. The power divider outputs two signals. In this way, the fourth phase-locked source outputs two signals through the fourth power divider. The first phase-locked source outputs two signals through the first power divider. Each signal is controlled by a single-pole single-throw switch. The fifth phase-locked source outputs 12GHz, which is output through the fifth power divider and the sixth power divider twice to output three signals. Each signal is controlled by a single-pole single-throw switch. One signal of each of the five frequency points is selected through four single-pole double-throw switches to form one signal. The signal is selected by the single-pole single-throw switch. Each time one frequency point is selected and output as the local oscillator signal of the primary frequency conversion filter module after amplification and filtering. Another signal is selected through four single-pole double-throw switches to form one signal. The signal is selected by the single-pole single-throw switch. Each time one frequency point is selected and output to the five division module. The third signal of the fifth phase-locked source is output as the third output of the phase-locked source module. The five division module includes a five division chip and a low pass filter. The local oscillator signal output by the phase-locked source module is filtered by the five division module to obtain one of the five frequency points, including 2GHz, 2.2GHz, 2.4GHz, 2.6GHz and 2.8GHz, as the intermediate frequency signal. The control module includes a stabilized filter circuit, a reference power divider circuit and a control circuit. The stabilized filter circuit supplies power to the phase-locked source and the microwave active chip. The reference power divider circuit is composed of inductors, capacitors and resistors to provide a 100MHz reference signal to the phase-locked source. The control circuit decodes the selection of each switch and the switch filter group frequency band through CPLD.

2. The millimeter-wave frequency-agile source of claim 1, wherein: The local oscillator signal and the intermediate frequency signal of different frequency points are selected and input to the primary frequency conversion module. The primary frequency conversion module includes a mixer chip and a switch filter group chip. The switch filter group is divided into eight segments, each with a passband bandwidth of 1GHz, filtering out the intermodulation signal of the mixer. The frequency range of the radio frequency signal obtained by mixing the local oscillator signal and the intermediate frequency signal in different combinations is 8-16GHz, with a step of 0.2GHz. The radio frequency signal is input to the secondary frequency conversion module as the intermediate frequency signal of the secondary frequency conversion.

3. The millimeter-wave frequency-agile source of claim 2, wherein: The clock source module outputs a 10GHz signal, which is split into two paths by the seventh power divider. One path is filtered by a frequency divider to output a 5GHz signal as a clock signal. The other path is directly outputted.

4. The millimeter-wave frequency-agile source of claim 3, wherein: The 10GHz signal outputted by the clock source module and the 12GHz signal outputted by the fifth phase-locked source are inputted into a frequency multiplication module. The frequency multiplication module selects a frequency point through the linkage of a single-pole single-throw switch and a single-pole double-throw switch, and obtains 40GHz and 48GHz local oscillator signals through a frequency quadrupler and a wave filter, which are inputted into a twice frequency conversion filter module. The clock source and the fifth phase-locked source are frequency quadrupled to serve as the local oscillator signals for twice frequency conversion, and the phase-locked source multiplexing is realized again.

5. The millimeter-wave frequency-agile source of claim 4, wherein: The components are assembled by a hybrid assembly process of electric assembly and micro-assembly. The phase-locked source module is electrically assembled, and is arranged on the front surface of the component to shield interference through a cavity. The power divider and the mixing filter are micro-assembled to realize chip integration. The back surface of the component is arranged with a voltage stabilizing filter circuit, a control circuit and a reference power dividing circuit to avoid mutual interference of the three functional circuits through reasonable arrangement, and the front surface circuit is interconnected through a pin insulator.

6. The millimeter-wave frequency-agile source of claim 5, wherein: The size of the millimeter wave frequency agile frequency source component is 155mm×66mm×10mm.

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