CN118191744B - Terahertz front end - Google Patents
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- CN118191744B CN118191744B CN202410594910.0A CN202410594910A CN118191744B CN 118191744 B CN118191744 B CN 118191744B CN 202410594910 A CN202410594910 A CN 202410594910A CN 118191744 B CN118191744 B CN 118191744B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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Abstract
The invention discloses a terahertz front end, and relates to the technical field of radar communication. The invention comprises a plurality of receiving channels, a plurality of transmitting channels, a first frequency multiplication amplifier for providing local oscillation signals for the plurality of receiving channels, and a second frequency multiplication amplifier for providing local oscillation signals for the plurality of transmitting channels; the first frequency multiplication amplifier is connected with each receiving channel through a first power divider, and the second frequency multiplication amplifier is connected with each transmitting channel through a second power divider; one end of the receiving feed sources is respectively connected with the receiving channels, the other end forms a receiving port; one end of the plurality of transmitting feed sources is respectively connected with a plurality of transmitting channels, the other end forms an emission port; each receiving channel is provided with an isomerism flange which is simultaneously connected with the first power divider and the corresponding receiving feed source, and each transmitting channel is provided with an isomerism flange which is simultaneously connected with the second power divider and the corresponding transmitting feed source. The terahertz front end miniature integration method can achieve terahertz front end miniature integration.
Description
Technical Field
The invention relates to the technical field of radar communication, in particular to a terahertz front end.
Background
Compared with other microwave millimeter wave frequency bands, the terahertz frequency band is more sensitive to Doppler change caused by target micro-motion due to the short wavelength, can effectively detect target micro-Doppler information which is difficult to be perceived by a conventional microwave radar, and is more beneficial to high-resolution detection and identification of micro targets and micro-motion targets. Therefore, terahertz radar detection and imaging are one of important application directions, and resolution and acting distance are important indexes for measuring radar performance. The resolution in the range direction is determined by the radar bandwidth, while the resolution in the azimuth direction is related to the antenna array aperture size. In order to improve the aperture of an antenna array of a traditional radar system and further ensure good azimuth resolution, a multiple-input multiple-output synthetic aperture radar (Multiple Input Multiple Output Synthetic Aperture Radar, MIMO-SAR) is commonly adopted at present.
The terahertz high-resolution MIMO-SAR system needs a plurality of radio frequency channels for target detection, so that the Nyquist sampling law is satisfied, the aliasing of azimuth signals is avoided, the high-resolution characteristic is realized, and the radio frequency front end needs to satisfy half-wavelength integration and miniaturization and low power consumption. And a traditional cascade circuit mode is adopted to realize a Multiple Input Multiple Output (MIMO) system, each circuit is provided with an independent module and a flange, and then the independent modules and the flanges are connected with each other based on the traditional flange, and the traditional flange structure only has one waveguide port for transmission. If multiple flanges are needed for transmission, and the connection ports of the flanges are of standard structures, the volume and connection loss of the radio frequency front end are greatly increased, and the half-wavelength integrated layout cannot be met. Both of these bottlenecks are detrimental to the implementation of miniaturized MIMO-SAR systems.
Disclosure of Invention
The invention aims to provide a terahertz front end so as to solve the technical problems. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention provides a terahertz front end, which comprises a plurality of receiving channels, a plurality of transmitting channels, a first frequency multiplication amplifier for providing local oscillation signals for the receiving channels, a second frequency multiplication amplifier for providing local oscillation signals for the transmitting channels and a heterogeneous waveguide connector, wherein the first frequency multiplication amplifier is connected with the first frequency multiplication amplifier;
The heterogeneous waveguide connector comprises a first power divider, a second power divider, a plurality of receiving feed sources and a plurality of transmitting feed sources, wherein the first frequency multiplication amplifier is connected with each receiving channel through the first power divider, and the second frequency multiplication amplifier is connected with each transmitting channel through the second power divider; one end of each of the receiving feed sources is connected with the corresponding receiving channel, and the other end of each of the receiving feed sources forms a receiving port; one end of each of the emission feed sources is connected with the emission channels, and the other end of each emission feed source forms an emission port;
Each receiving channel is provided with an isomerism flange which is simultaneously connected with the first power divider and the corresponding receiving feed source, each transmitting channel is provided with an isomerism flange which is simultaneously connected with the second power divider and the corresponding transmitting feed source, and a receiving port and a transmitting port are concentrated in the same direction through the isomerism flange.
Preferably, each receiving channel comprises a first isomerism flange connector, a 340GHz mixer, a 170GHz frequency multiplier, a first local oscillator drive frequency multiplier amplifier and an X-band frequency multiplier; the first isomerism flange connector, the 340GHz mixer, the 170GHz frequency multiplier, the first local oscillator drive frequency multiplier amplifier and the X-band frequency multiplier are sequentially interconnected along the vertical section of the flange plate of the isomerism flange of the receiving channel to form a terahertz vertical interconnection integrated receiving channel.
Preferably, the receiving feed source is connected with the 340GHz mixer through a half-wavelength connecting waveguide arranged on a corresponding isomerism flange of the first isomerism flange connector; the first power divider is connected with the first local oscillator driving frequency multiplication amplifier through an isomerism flange corresponding to the first isomerism flange connector.
Preferably, the 340GHz mixer and the 170GHz frequency multiplier are connected through a transition waveguide; the 170GHz frequency multiplier, the first local oscillator driving frequency multiplier amplifier and the X-band frequency multiplier are sequentially connected through the low-power-consumption probe.
Preferably, each transmitting channel comprises a second isomerism flange connector, a 340GHz frequency multiplier, a D wave band frequency multiplier, a second local oscillator drive frequency multiplier amplifier and an X wave band frequency multiplier and amplifier; the second isomerism flange connector, the 340GHz frequency multiplier, the D wave band frequency multiplier, the second local oscillator drive frequency multiplier amplifier, the X wave band frequency multiplier and the amplifier are sequentially interconnected along the vertical section of the flange plate of the isomerism flange of the transmitting channel to form a terahertz vertical interconnection integrated transmitting channel.
Preferably, the transmitting feed source is connected with the 340GHz frequency multiplier through a half-wavelength connecting waveguide arranged on the corresponding isomerism flange of the second isomerism flange connector; and the second power divider is connected with the second local oscillator driving frequency multiplication amplifier through an isomerism flange corresponding to the second isomerism flange connector.
Preferably, the D-band frequency multiplier, the second local oscillator driving frequency multiplier amplifier, the X-band frequency multiplier and the amplifier are connected in sequence through a low-power probe; the 340GHz frequency multiplier and the D wave band frequency multiplier are connected through transition waveguides.
Preferably, the first power divider and the second power divider are one-division multi-Y-shaped power dividers, a Y-shaped root end of the first power divider is connected with the first frequency doubling amplifier, and Y-shaped matching branch ends are respectively connected with the receiving channel through an isomerism flange of the receiving channel; and the Y-shaped root end of the second power divider is connected with the second frequency multiplication amplifier, and the Y-shaped matching branch ends are respectively connected with the transmitting channel through the heterogeneous flange of the transmitting channel.
Preferably, the first frequency multiplication amplifier is provided with a standard flange, and the standard flange of the first frequency multiplication amplifier is connected with the Y-shaped root end of the first power divider; the second frequency multiplication amplifier is provided with a standard flange, and the standard flange of the second frequency multiplication amplifier is connected with the Y-shaped root end of the second power divider.
Preferably, the receiving feed source and the transmitting feed source are half-wavelength feed sources with bent waveguide structures, and a plurality of the receiving feed sources and the transmitting feed sources form a half-wavelength feed source array; the integrated layout of the half-wavelength feed source array can be realized through the heterogeneous flange.
By implementing one of the technical schemes, the invention has the following advantages or beneficial effects:
According to the invention, two waveguide transmission ports are concentrated on one flange plate through the isomerism flange, one waveguide transmission port is connected with a feed source, and the other waveguide transmission port is connected with a power divider, so that an isomerism flange structure is formed. The two waveguide transmission ports are arranged on the same flange plate, so that the volume of the whole circuit of the terahertz front end is greatly reduced. In addition, on one hand, input and output ports of the terahertz front end are concentrated in the same direction through the isomerism flange so as to be connected with a feed source and a power divider; on the other hand, the number of the external interfaces of the whole cavity of the terahertz front end can be reduced.
According to the invention, the related circuits of the channels are effectively integrated in one module through the direct-interconnection integrated receiving channel and the direct-interconnection integrated transmitting channel, and are connected with the feed source and the power divider through the same heterogeneous flange, so that the miniaturization of the radio frequency front-end circuit of the terahertz radar system and the compact integration of the feed source are further realized. Meanwhile, a multi-layer circuit is adopted, the probe is used for connection in the vertical direction, the transmission line is much shorter, and low loss of connection can be realized.
The invention can provide more than 20dB of inter-channel isolation while realizing broadband matching through the one-to-many Y-branch matching power divider, and effectively reduces the electromagnetic interference among channels.
Drawings
For a clearer description of the technical solutions of embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, in which:
FIG. 1 is a perspective view of a terahertz front end in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of the internal structure of a terahertz front end according to an embodiment of the present invention;
FIG. 3 is a split schematic diagram of a receive channel structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the separation of the transmit channel structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a receive channel circuit configuration connection in accordance with an embodiment of the present invention;
fig. 6 is a schematic diagram of a transmission channel circuit structure connection according to an embodiment of the present invention.
In the figure:
100. A receiving channel; 101. a first receiving channel; 102. a second receiving channel; 103. a third receive channel; 104. a fourth receive channel; 105. a first heterogeneous flange connector; 106. a 340GHz mixer; 107. 170GHz frequency multiplier; 108. the first local oscillator drives a frequency multiplication amplifier; 109. an X-band frequency multiplier; 200. a transmit channel; 201. a first emission channel; 202. a second transmit channel; 203. a second heterogeneous flange connector; 204. 340GHz frequency multiplier; 205. a D band frequency multiplier; 206. the second local oscillator drives a frequency multiplication amplifier; 207. x-band frequency multiplication and amplification device; 300. a first frequency multiplication amplifier; 400. a second frequency multiplication amplifier; 500. a heterogeneous waveguide connector; 510. a first power divider; 520. a second power divider; 530. receiving a feed source; 531. a first receive feed; 532. a second receive feed; 533. a third receiving feed, 534, a fourth receiving feed; 540. a transmitting feed source; 541. a first transmission feed; 542. a second transmission feed; 550. a receiving port and a transmitting port; 600. an isoparaffinic flange; 700. a standard flange.
Detailed Description
For a better understanding of the objects, technical solutions and advantages of the present invention, reference should be made to the various exemplary embodiments described hereinafter with reference to the accompanying drawings, which form a part hereof, and in which are described various exemplary embodiments which may be employed in practicing the present invention. The same reference numbers in different drawings identify the same or similar elements unless expressly stated otherwise. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatuses, etc. that are consistent with certain aspects of the present disclosure as detailed in the appended claims, other embodiments may be utilized, or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the present disclosure.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," and the like are used in an orientation or positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and to simplify the description, rather than to indicate or imply that the elements referred to must have a particular orientation, be constructed and operate in a particular orientation. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected," "coupled" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, communicatively connected, directly connected, indirectly connected via intermediaries, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The term "and/or" includes any and all combinations of one or more of the associated listed items. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In order to illustrate the technical solutions of the present invention, the following description is made by specific embodiments, only the portions related to the embodiments of the present invention are shown.
As shown in fig. 1-2, the present invention provides a terahertz front end, which includes a plurality of receiving channels 100, a plurality of transmitting channels 200, a first frequency multiplier amplifier 300 for providing local oscillation signals to the plurality of receiving channels 100, a second frequency multiplier amplifier 400 for providing local oscillation signals to the plurality of transmitting channels 200, and a heterogeneous waveguide connector 500. The heterogeneous waveguide connector 500 comprises a first power divider 510, a second power divider 520, a plurality of receiving feeds 530 and a plurality of transmitting feeds 540, wherein the first frequency doubling amplifier 300 is connected with each receiving channel 100 through the first power divider 510, and the second frequency doubling amplifier 400 is connected with each transmitting channel 200 through the second power divider 520; one end of each of the plurality of receiving feed sources 530 is connected to the plurality of receiving channels 100, and the other end forms a receiving port; one end of the plurality of transmitting feed sources 540 is respectively connected with the plurality of transmitting channels 200, and the other end forms a transmitting port. Each receiving channel 100 is provided with a heterogeneous flange 600 simultaneously connecting the first power divider 510 and the corresponding receiving feed 530, and each transmitting channel is provided with a heterogeneous flange 600 simultaneously connecting the second power divider 520 and the corresponding transmitting feed 540, and the receiving port and the transmitting port 550 are concentrated in the same direction through the heterogeneous flange 600.
It should be noted that the number of receiving feed sources is consistent with the number of receiving channels, each receiving channel is connected with one receiving feed source in a one-to-one correspondence, the number of transmitting feed sources is consistent with the number of transmitting channels, and each transmitting channel is connected with one transmitting feed source in a one-to-one correspondence. The receiving port and the transmitting port formed by the receiving feed source and the transmitting feed source can be arranged on the end face of the heterogeneous waveguide connector and communicated with the outside (namely, the end face of the heterogeneous waveguide connector is provided with a hole structure for the receiving port and the transmitting port to be arranged outside, and each port can correspond to one hole structure) so as to prevent signal shielding.
The invention discloses an isomerism flange which is formed by concentrating two waveguide transmission ports on a flange plate, wherein one waveguide transmission port is connected with a feed source, and the other waveguide transmission port is connected with a power divider. The isomerism flange is different from the traditional flange in that: the traditional flange structure only has one waveguide port for transmission, and is arranged at the most middle part of the flange. If two waveguide ports are required for transmission, two flanges are required, and the connection ports of the flanges are of standard structures, so that the volume of the whole circuit of the terahertz front end is increased. The two waveguide transmission ports are arranged on the same flange plate, so that the volume of the whole circuit of the terahertz front end is greatly reduced. In addition, on one hand, input and output ports of the terahertz front end are concentrated in the same direction through the isomerism flange so as to be connected with a feed source and a power divider; on the other hand, the number of the external interfaces of the whole cavity of the terahertz front end can be reduced (the invention can realize that a plurality of ports correspond to one flange, and the prior art is that one port corresponds to one flange).
It should be noted that, the conventional flange has only one port in the middle portion, and two flanges are required for two ports, so that the conventional circuit has a simple structure, and the two flanges are separately arranged, but the volume is increased. It is difficult to achieve focusing of the receive port and the transmit port in the same direction under the limitations of multiple channels and volumes. If the concentration of the receiving port and the transmitting port 550 in the same direction is to be achieved, the volume of the terahertz front end needs to be sacrificed, which is disadvantageous for miniaturization of the terahertz front end. Therefore, the terahertz front end of the example can be miniaturized, and meanwhile, the receiving port and the transmitting port are concentrated in the same direction, so that the signal detection and the compact integration of the feed source are facilitated.
As shown in fig. 3 and 5, as an alternative embodiment, each receiving channel 100 includes a first heterogeneous flange connector 105, a 340GHz mixer 106, a 170GHz frequency multiplier 107, a first local oscillator drive frequency multiplier 108, and an X-band frequency multiplier 109. Specifically, the first isomerism flange connector 105, the 340GHz mixer 106, the 170GHz frequency multiplier 107, the first local oscillator driving frequency multiplier 108, and the X-band frequency multiplier 109 are sequentially interconnected along the flange vertical section of the isomerism flange 600 of the receiving channel 100, so as to form a terahertz vertical interconnection integrated receiving channel.
It should be noted that, the circuits such as the first isomerism flange connector 105, the 340GHz mixer 106, the 170GHz frequency multiplier 107, the first local oscillator driving frequency multiplier 108, the X-band frequency multiplier 109 and the like are effectively integrated in a module through the direct interconnection integrated receiving channel, and are connected with the receiving feed source and the power divider through the same isomerism flange, so that the miniaturization of the terahertz system radio frequency front-end circuit and the integration of the feed source (such as a half-wavelength feed source) are further facilitated. In the prior art, the receiving channel circuits (such as a 340GHz mixer, a 170GHz frequency multiplier, a local oscillator driving frequency multiplier amplifier, an X-band frequency multiplier, etc.) are often integrated in a cascade manner, and each circuit has an independent module and a flange and is then connected with each other based on the flange. The method is simple and effective, but greatly increases the volume and connection loss of the radio frequency front end, and cannot meet the integrated layout of the half-wavelength feed source. Therefore, the invention adopts a vertical interconnection mode, further integrates the first isomerism flange connector 105, the 340GHz mixer 106, the 170GHz frequency multiplier 107, the first local oscillator drive frequency multiplier amplifier 108 and the X-band frequency multiplier 109 in a small module, shares one isomerism flange 600, further reduces the volume of a plurality of receiving channels, and further greatly reduces the volume of the whole terahertz front end.
As an alternative embodiment, the receiving feed 530 and 340GHz mixer 106 are connected by a half-wavelength connecting waveguide disposed on the corresponding heterogeneous flange 600 of the first heterogeneous flange connector 105; the first power divider 510 is connected to the first local oscillator-driven frequency multiplier amplifier 108 through a corresponding isomerization flange 600 of the first isomerization flange connector 105.
As an alternative embodiment, the 340GHz mixer 106, 170GHz frequency doubler 107 is connected by transition waveguides. It should be noted that, the use of transition waveguide can reduce the transmission loss of electromagnetic wave and improve the circuit performance.
As an alternative embodiment, the 170GHz frequency multiplier 107, the first local oscillator drive frequency multiplier 108, and the X-band frequency multiplier 109 are sequentially connected through a low power probe. It should be noted that, based on the interconnection of the low-loss probes in the vertical direction, the connection loss between the multi-layer circuits is reduced, and the miniaturized high-performance radio frequency front end is realized. The traditional circuit is single-layered, and then a plurality of circuit modules are cascaded in the horizontal direction, so that the connection loss is high. The invention adopts a multilayer circuit, and is connected by probes in the vertical direction, so that the transmission line is much shorter, and the connection loss can be low.
As shown in fig. 4 and 6, as an alternative embodiment, each transmit channel 200 includes a second heterogeneous flange connector 203, a 340GHz frequency multiplier 204, a D-band frequency multiplier 205, a second local oscillator drive frequency multiplier amplifier 206, and an X-band frequency multiplier and amplifier 207. Specifically, the second isomerism flange connector 203, the 340GHz frequency multiplier 204, the D-band frequency multiplier 205, the second local oscillator drive frequency multiplier amplifier 206, the X-band frequency multiplier and the amplifier 207 are sequentially interconnected along the vertical cross section of the flange of the isomerism flange 600 of the transmitting channel 200, so as to form a terahertz vertical interconnection integrated transmitting channel.
It should be noted that, the circuits such as the second isomerism flange connector 203, the 340GHz frequency multiplier 204, the D-band frequency multiplier 205, the second local oscillator driving frequency multiplier amplifier 206, the X-band frequency multiplier and amplifier 207 are effectively integrated in a module through the direct interconnection integrated transmitting channel, and are connected with the transmitting feed source and the power divider through the same isomerism flange, so that the miniaturization of the radio frequency front-end circuit of the radar system and the feed source (such as a half-wavelength feed source) are further realized. In the prior art, the transmitting channel circuits (such as a 340GHz frequency multiplier, a D band frequency multiplier, a local oscillator driving frequency multiplier amplifier, an X band frequency multiplier and an amplifier) are often integrated in a cascading manner, each circuit is provided with an independent module and a flange, and then are connected with each other based on the flange, and the method is simple and effective, but greatly increases the volume and connection loss of the radio frequency front end, and cannot meet the integration layout of a feed source (half wavelength). Therefore, the invention adopts a vertical interconnection mode, further integrates the second isomerism flange connector 203, the 340GHz frequency multiplier 204, the D-band frequency multiplier 205, the second local oscillator drive frequency multiplier amplifier 206 and the X-band frequency multiplier and amplifier 207 in a small module, shares one isomerism flange 600, further reduces the volume of a plurality of transmitting channels, and further greatly reduces the whole volume of the whole terahertz front end.
As an alternative embodiment, the transmitting feed 540 and 340GHz frequency doubler 204 are connected by a half wavelength connecting waveguide disposed on the corresponding heterogeneous flange 600 of the second heterogeneous flange connector 203. Further, the second power divider 520 is connected to the second local oscillator-driven frequency multiplier amplifier 206 through a corresponding isomerism flange 600 of the second isomerism flange connector 203.
As an alternative embodiment, the D-band frequency multiplier 205, the second local oscillator drive frequency multiplier amplifier 206, and the X-band frequency multiplier and amplifier 207 are sequentially connected through a low power probe. It should be noted that, based on the interconnection of the low-loss probes in the vertical direction, the connection loss between the multi-layer circuits is reduced, and the miniaturized high-performance radio frequency front end is realized. The traditional circuit is single-layered, and then a plurality of circuit modules are cascaded in the horizontal direction, so that the connection loss is high. The invention adopts a multilayer circuit, and is connected by probes in the vertical direction, so that the transmission line is much shorter, and the connection loss can be low.
As an alternative embodiment, a transition waveguide connection is provided between 340GHz frequency doubler 204 and D band frequency doubler 205. It should be noted that, the use of transition waveguide can reduce the transmission loss of electromagnetic wave and improve the circuit performance.
As an alternative embodiment, the first power divider 510 and the second power divider 520 are all one-division-multiple-Y-type power dividers; the Y-shaped root end of the first power divider 510 is connected with the first frequency doubling amplifier 300, and the Y-shaped matching branch ends are respectively connected with the receiving channel 100; the Y-shaped root end of the second power divider 520 is connected to the second frequency multiplier amplifier 400, and the Y-shaped matching branch ends are respectively connected to the transmitting channels 200. Wherein the number of the Y-shaped matching branches of the first power divider 510 is identical to the number of the receiving channels 100, and the number of the Y-shaped matching branches of the second power divider 520 is identical to the number of the transmitting channels 200.
It should be noted that, in order to solve the problem of inter-channel interference caused by poor isolation of the traditional Y-shaped junction power divider, the invention adopts a one-to-many Y-shaped power divider, namely the Y-shaped junction power divider is matched by branches, so that the broadband matching is realized, and meanwhile, the inter-channel isolation of more than 20dB can be provided, and the problem of inter-channel electromagnetic interference is solved.
As an alternative embodiment, the first frequency doubling amplifier 300 is provided with a standard flange 700, and the standard flange of the first frequency doubling amplifier 300 is connected to the Y-shaped root end of the first power divider 510. The second frequency multiplier amplifier 400 is provided with a standard flange 700, and the standard flange of the second frequency multiplier amplifier 400 is connected with the Y-shaped root end of the second power divider 520.
As an alternative implementation manner, the receiving feed source 530 and the transmitting feed source 540 are half-wavelength feed sources with curved waveguide structures, and a plurality of receiving feed sources 530 and transmitting feed sources 540 form a half-wavelength feed source array; the integrated layout of the half-wavelength feed source array can be realized through the heterogeneous flange. The feed source of the invention adopts a bent waveguide structure, and further realizes the semi-wavelength feed source integrated layout by extending the waveguide, thereby being beneficial to the terahertz front end miniaturized integrated layout.
As an example, as shown in fig. 1 and 2, a 2-transmit 4-receive terahertz front end is provided with 2 transmit channels and 4 receive channels. Compared with single-shot receiving, the target Doppler information captured by different channels improves the perception fine granularity of the moving target characteristics, and finally, accurate target identification is realized.
The 2-transmit 4-receive terahertz front end includes a first receiving channel 101, a second receiving channel 102, a third receiving channel 103, a fourth receiving channel 104, a first transmitting channel 201, a second transmitting channel 202, a first frequency multiplier 300 for providing local oscillation signals to the 4 receiving channels 100, and a second frequency multiplier 400 for providing local oscillation signals to the 2 transmitting channels 200.
Specifically, the first frequency multiplier amplifier 300 is connected to the first receiving channel 101, the second receiving channel 102, the third receiving channel 103, and the fourth receiving channel 104 through a divide-by-four Y-type power divider. The Y-shaped root end of the one-to-four Y-shaped power divider is connected with the first frequency doubling amplifier 300 through a standard flange 700, and the four Y-shaped matching branch ends of the one-to-four Y-shaped power divider are respectively connected with the isomerism flange of the first receiving channel 101, the isomerism flange of the second receiving channel 102, the isomerism flange of the third receiving channel 103 and the isomerism flange of the fourth receiving channel 104; the second frequency multiplication amplifier 400 is connected with the first transmitting channel 201 and the second transmitting channel 202 through a one-to-two Y-shaped power divider. The Y-shaped root end of the one-to-two Y-shaped power divider is connected with the second frequency multiplier amplifier 400 through the standard flange 700, and the two Y-shaped matching branch ends of the one-to-two Y-shaped power divider are respectively connected with the isomerism flange of the first transmitting channel 201 and the isomerism flange of the second transmitting channel 202.
The isomerism flange of the first receiving channel 101, the isomerism flange of the second receiving channel 102, the isomerism flange of the third receiving channel 103 and the isomerism flange of the fourth receiving channel 104 are respectively connected with one end of a first receiving feed 531, one end of a second receiving feed 532, one end of a third receiving feed 533 and one end of a fourth receiving feed 534, and the isomerism flange of the first transmitting channel 201 and the isomerism flange of the second transmitting channel 202 are respectively connected with one end of a first transmitting feed 541 and one end of a second transmitting feed 542; the other end of the first receiving feed 531, the other end of the second receiving feed 532, the other end of the third receiving feed 533, the other end of the fourth receiving feed 534, the other end of the first transmitting feed 541 and the other end of the second transmitting feed 542 are concentrated in the same direction through the heterogeneous flange, so that a receiving port and a transmitting port 550 of the terahertz front end with 2-transmission and 4-reception are formed.
The first receiving feed 531, the second receiving feed 532, the third receiving feed 533, the fourth receiving feed 534, the first transmitting feed 541 and the second transmitting feed 542 are half-wavelength feeds with bent waveguide structures. The internal structures of the 2 transmitting channels and the 4 receiving channels and their connection relationships are described above, and are not described here again.
It should be noted that, the one-to-four Y-shaped power divider, the one-to-two Y-shaped power divider, the first receiving feed 531, the second receiving feed 532, the third receiving feed 533, the fourth receiving feed 534, the first transmitting feed 541, and the second transmitting feed 542 may be processed by 3D printing to obtain the heterogeneous waveguide connector 500, where the heterogeneous waveguide connector 500 is provided with a receiving port and a transmitting port 550 corresponding to the terahertz front end.
The foregoing is only illustrative of the preferred embodiments of the application, and it will be appreciated by those skilled in the art that various changes in the features and embodiments may be made and equivalents may be substituted without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. The terahertz front end is characterized by comprising a plurality of receiving channels, a plurality of transmitting channels, a first frequency multiplication amplifier for providing local oscillation signals for the receiving channels, a second frequency multiplication amplifier for providing local oscillation signals for the transmitting channels and a heterogeneous waveguide connector;
The heterogeneous waveguide connector comprises a first power divider, a second power divider, a plurality of receiving feed sources and a plurality of transmitting feed sources, wherein the first frequency multiplication amplifier is connected with each receiving channel through the first power divider, and the second frequency multiplication amplifier is connected with each transmitting channel through the second power divider; one end of each of the receiving feed sources is connected with the corresponding receiving channel, and the other end of each of the receiving feed sources forms a receiving port; one end of each of the emission feed sources is connected with the emission channels, and the other end of each emission feed source forms an emission port;
Each receiving channel is provided with an isomerism flange which is simultaneously connected with the first power divider and the corresponding receiving feed source, each transmitting channel is provided with an isomerism flange which is simultaneously connected with the second power divider and the corresponding transmitting feed source, and a receiving port and a transmitting port are concentrated in the same direction through the isomerism flange;
The first power divider and the second power divider are one-division-multiple-Y-shaped power dividers, the Y-shaped root end of the first power divider is connected with the first frequency doubling amplifier, and the Y-shaped matching branch ends are respectively connected with the receiving channel through the heterogeneous flange of the receiving channel; the Y-shaped root end of the second power divider is connected with the second frequency doubling amplifier, and the Y-shaped matching branch ends are respectively connected with the transmitting channel through the heterogeneous flange of the transmitting channel;
the first frequency multiplication amplifier is provided with a standard flange, and the standard flange of the first frequency multiplication amplifier is connected with the Y-shaped root end of the first power divider; the second frequency multiplication amplifier is provided with a standard flange, and the standard flange of the second frequency multiplication amplifier is connected with the Y-shaped root end of the second power divider;
The receiving feed source and the transmitting feed source are half-wavelength feed sources with bent waveguide structures, and a plurality of the receiving feed sources and the transmitting feed sources form a half-wavelength feed source array; the integrated layout of the half-wavelength feed source array can be realized through the heterogeneous flange.
2. The terahertz front end of claim 1, wherein each of the receive channels includes a first heterogeneous flange connector, a 340GHz mixer, a 170GHz frequency multiplier, a first local oscillator drive frequency multiplier amplifier, and an X-band frequency multiplier;
the first isomerism flange connector, the 340GHz mixer, the 170GHz frequency multiplier, the first local oscillator drive frequency multiplier amplifier and the X-band frequency multiplier are sequentially interconnected along the vertical section of the flange plate of the isomerism flange of the receiving channel to form a terahertz vertical interconnection integrated receiving channel.
3. The terahertz front end of claim 2, wherein the receiving feed and the 340GHz mixer are connected by a half-wavelength connecting waveguide disposed on a corresponding heterogeneous flange of the first heterogeneous flange connector;
The first power divider is connected with the first local oscillator driving frequency multiplication amplifier through an isomerism flange corresponding to the first isomerism flange connector.
4. The terahertz front end of claim 2, wherein the 340GHz mixer, 170GHz frequency multiplier are connected by transition waveguides;
The 170GHz frequency multiplier, the first local oscillator driving frequency multiplier amplifier and the X-band frequency multiplier are sequentially connected through the low-power-consumption probe.
5. The terahertz front end of claim 1, wherein each of the transmit channels includes a second heterogeneous flange connector, a 340GHz frequency multiplier, a D band frequency multiplier, a second local oscillator drive frequency multiplier amplifier, an X band frequency multiplier and amplifier;
the second isomerism flange connector, the 340GHz frequency multiplier, the D wave band frequency multiplier, the second local oscillator drive frequency multiplier amplifier, the X wave band frequency multiplier and the amplifier are sequentially interconnected along the vertical section of the flange plate of the isomerism flange of the transmitting channel to form a terahertz vertical interconnection integrated transmitting channel.
6. The terahertz front end of claim 5, wherein the transmission feed source and the 340GHz frequency multiplier are connected by a half-wavelength connection waveguide disposed on a corresponding isomerism flange of the second isomerism flange connector;
and the second power divider is connected with the second local oscillator driving frequency multiplication amplifier through an isomerism flange corresponding to the second isomerism flange connector.
7. The terahertz front end of claim 5, wherein the D-band frequency multiplier, the second local oscillator drive frequency multiplier amplifier, the X-band frequency multiplier and the amplifier are connected in sequence by a low-power probe;
The 340GHz frequency multiplier and the D wave band frequency multiplier are connected through transition waveguides.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109085539A (en) * | 2018-08-10 | 2018-12-25 | 湖南航天环宇通信科技股份有限公司 | A kind of double-reflecting face radar imagery antenna |
| CN115421105A (en) * | 2022-09-21 | 2022-12-02 | 苏州华域祥电子科技有限公司 | Terahertz integrated radar system front end and radar system |
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| DE102008015160B4 (en) * | 2008-03-20 | 2010-03-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Detector device and corresponding method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085539A (en) * | 2018-08-10 | 2018-12-25 | 湖南航天环宇通信科技股份有限公司 | A kind of double-reflecting face radar imagery antenna |
| CN115421105A (en) * | 2022-09-21 | 2022-12-02 | 苏州华域祥电子科技有限公司 | Terahertz integrated radar system front end and radar system |
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