A feed network for implementing subarray multiplexing

Abstract

The application relates to a feed network for realizing subarray multiplexing and belongs to the technical field of antennas, and solves the problems of low antenna aperture utilization and large antenna size in the prior art. The transmitting network comprises one transmitting channel and an HT power divider, the HT power divider divides the transmitting channel into four paths; the receiving network comprises a plurality of receiving channels and HT power dividers; the receiving channels are divided into four paths through the HT power dividers. Second ET power dividers are arranged at the ends of the receiving network, and the second ET power dividers are used for being combined with a circulator. Odd receiving channels and even receiving channels of the receiving channels are arranged at intervals; the even receiving channels and the odd receiving channels on the two sides share the second ET power dividers. The receiving channels and the transmitting channels share antenna units, the transmitting and receiving multiplexing of the subarrays is realized, and the efficiency of the antenna is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna, in particular to a feed network for realizing subarray multiplexing. BACKGROUND

[0002] When the missile enters the terminal attack stage, in order to achieve accurate attack on the target, the method of active imaging homing terminal guidance is needed, that is, the target in the area in front of the flight direction of the missile body is imaged by using a detection sensor, the target is identified by extracting the target features from the radar image, and finally the measurement information is obtained and the guidance quantity information is output to the missile to guide the missile to achieve accurate tracking of the target and complete accurate attack on the target.

[0003] Antenna technology brings great convenience to the guidance control of the terminal attack stage of the missile, and is mainly applied to forward-looking imaging radar technology. The radar imaging is realized by transmitting a designed microwave signal through the radar antenna. When the microwave signal contacts the scene target, a scattering field is generated, and the scattering signal containing the scene target information is received by the radar antenna after propagation. The direction of the radar beam irradiation and the flight direction of the carrier need to have a certain angle to obtain the azimuth Doppler bandwidth. The target is distinguished by the pulse compression technology of the linear frequency modulation signal and the azimuth Doppler generated by the relative motion between the radar and the scene target, and finally a ground scene image with high resolution in the range direction and high resolution in the azimuth direction is obtained.

[0004] The forward-looking imaging radar technology brings great convenience to the guidance control of the terminal attack stage of the missile. The realization of the forward-looking imaging radar technology mainly depends on the antenna technology. The imaging of the target is realized by transmitting and receiving signals through the antenna. The existing antenna has the problems of low aperture utilization rate and large antenna size. In order to obtain a ground scene image with high resolution in the range direction and high resolution in the azimuth direction, a multi-phase central array antenna needs to be designed. SUMMARY

[0005] In view of the above analysis, the present application aims to provide a feed network for realizing subarray multiplexing, in order to solve the problems of low aperture utilization rate and large antenna size of the existing antenna.

[0006] The main purpose of the present application is realized by the following technical scheme:

[0007] A feed network for realizing subarray multiplexing, comprising: a transmitting network and a receiving network; the transmitting network comprises: one transmitting channel and a first HT power divider, the first HT power divider is used for dividing the transmitting channel into four paths; the receiving network comprises: a plurality of receiving channels and a second HT power divider; the second HT power divider divides the receiving channels into four paths.

[0008] Further, the shunt end of the receiving network is provided with a second ET power divider, which is used in combination with a circulator.

[0009] Further, the receiving channels are divided into odd receiving channels and even receiving channels, and the odd receiving channels and the even receiving channels are arranged alternately; the even receiving channels and the odd receiving channels on both sides share a second ET power divider.

[0010] Further, the receiving channels include a first receiving channel, a second receiving channel, a third receiving channel, a fourth receiving channel and a fifth receiving channel.

[0011] Further, the end of the second receiving channel is provided with four second ET power dividers, and the left two ET power dividers share two second ET power dividers of the first receiving channel; the right two ET power dividers share two second ET power dividers of the third receiving channel.

[0012] Further, the end of the fourth receiving channel is provided with four second ET power dividers, and the left two ET power dividers share two second ET power dividers of the third receiving channel; the right two ET power dividers share two second ET power dividers of the fifth receiving channel.

[0013] Further, one HT power divider can divide the signal of the transmitting channel or the receiving channel into two paths; three first HT power dividers in two levels in series can divide the signal of the transmitting channel into four paths; three second HT power dividers in two levels in series can divide the signal of the receiving channel into four paths.

[0014] Further, the receiving channels are provided with 12 second ET power dividers.

[0015] Further, the end of the transmitting channel is provided with two first HT power dividers.

[0016] Further, the interfaces of the second ET power dividers of the receiving channels and the interfaces of the first HT power dividers of the transmitting channels are located in the same plane.

[0017] The technical scheme of the present application can at least achieve one of the following effects:

[0018] In view of the requirements of the current carrier platform for anti-interference and lightness, the antenna is required to have a wideband and low profile, and the antenna of the present application adopts a waveguide resonant cavity type unit form, which can effectively improve the working bandwidth of the antenna, and through a waveguide coupling slot series feeding mode, 5 subarrays are integrated into one port surface, and a low profile common aperture design is realized.

[0019] The length of the power supply network is equalized, the five sub-arrays can be used for transmitting and receiving alone or in array, the appropriate aperture can be selected according to different application scenarios, the application scenarios of the radar are enriched, the multi-phase center sub-array receiving can realize the Doppler bandwidth in the azimuth direction, and the possibility of forward-looking imaging is provided, and the antenna has the characteristics of high gain, low profile, high polarization isolation and the like.

[0020] In the present application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained from the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the embodiments, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain the principles of the application. In the drawings:

[0022] Figure 1 It is a schematic diagram of a wideband low-profile common-aperture multi-phase center array antenna structure.

[0023] Figure 2 It is a schematic diagram of a wideband low-profile common-aperture multi-phase center array antenna principle diagram.

[0024] Figure 3 It is a schematic diagram of a 2x24 waveguide sub-array antenna unit structure.

[0025] Figure 4 It is a schematic diagram of a circulator combination structure.

[0026] Figure 5 It is a schematic diagram of a feed network structure.

[0027] Figure 6 It is a schematic diagram of a transmitting network structure.

[0028] Figure 7 It is a schematic diagram of a receiving network structure.

[0029] REFERENCE NUMERALS:

[0030] 101-waveguide sub-array antenna unit; 102-circulator combination; 103-transmitting channel; 104-first receiving channel; 105-second receiving channel; 106-third receiving channel; 107-fourth receiving channel; 108-fifth receiving channel; 301-radiating unit; 302-feed waveguide; 303-first ET power divider; 401-circulator one port; 402-circulator two port; 403-circulator three port; 501-HT power divider; 502-second ET power divider. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components are denoted by the same reference numerals, for the purpose of illustrating the principles of the present application, and are not intended to limit the scope of the present application.

[0032] Embodiment 1

[0033] In one embodiment of the present application, a feed network for implementing subarray multiplexing is provided, and specifically, as shown in FIG. 1, the feed network comprises a transmitting network and a receiving network. Figures 5-7

[0034] The transmitting network comprises one transmitting channel 103 and three HT power dividers 501, and the HT power dividers 501 are used to divide the transmitting channel 103 into four paths.

[0035] The receiving network comprises a plurality of receiving channels and HT power dividers 501, and the receiving channels are divided into four paths by the HT power dividers 501. Further, in order to realize the connection between the receiving channels and the circulators, the second ET power dividers 502 are arranged at the ends of the branches of the receiving network, and the second ET power dividers 502 are used to connect with the circulator combination 102. There are 12 second ET power dividers 502 arranged in the receiving channels.

[0036] Further, one HT power divider 501 can divide the signal of the transmitting channel 103 or the receiving channel into two paths, and three HT power dividers 501 in two levels in series can divide the signal of the transmitting channel 103 or the receiving channel into four paths.

[0037] Further, as shown in FIG. 1, the receiving channels are divided into odd receiving channels and even receiving channels, the odd receiving channels and the even receiving channels are arranged alternately, and the even receiving channels share the second ET power dividers 502 with the odd receiving channels on both sides. Figure 6

[0038] In one embodiment of the present application, the receiving channels comprise a first receiving channel 104, a second receiving channel 105, a third receiving channel 106, a fourth receiving channel 107, and a fifth receiving channel 108.

[0039] Specifically, four second ET power dividers 502 are arranged at the end of the second receiving channel 105, and the left two ET power dividers 502 are shared with the two second ET power dividers 502 of the first receiving channel 104, and the right two ET power dividers 502 are shared with the two second ET power dividers 502 of the third receiving channel 106.

[0040] ​​The fourth receiving channel 107 is equipped with four second ET power dividers 502 at its end. The two ET power dividers 502 on the left are shared with the two second ET power dividers 502 of the third receiving channel 106; the two ET power dividers 502 on the right are shared with the two second ET power dividers 502 of the fifth receiving channel 108. Figure 6 As shown.

[0041] In this invention, by setting the second receiving channel 105 to share four ET power dividers 502 with the first receiving channel 104 and the third receiving channel 106, the second receiving channel 105 and the first receiving channel 104 are simultaneously connected to waveguide subarray antenna elements 101 numbered 3 and 4, and the second receiving channel 105 and the third receiving channel 106 are simultaneously connected to waveguide subarray antenna elements 101 numbered 5 and 6, thereby realizing the receiving multiplexing of waveguide subarray antenna elements 101 numbered 3-6.

[0042] In this invention, by setting the fourth receiving channel 107 to share four ET power dividers 502 with the third receiving channel 106 and the fifth receiving channel 108, the fourth receiving channel 107 and the third receiving channel 106 share waveguide subarray antenna elements 101 numbered 7 and 8, and the fourth receiving channel 107 and the fifth receiving channel 108 share waveguide subarray antenna elements 101 numbered 9 and 10, thereby realizing the receiving multiplexing of waveguide subarray antenna elements 101 numbered 6-10.

[0043] In this invention, two HT power dividers 501 are provided at the end of the transmission channel 103, providing a total of four output ports. The transmission channel 103 is connected to circulator port 2 402, which is in forward communication with circulator port 3 403. Circulator port 3 403 is connected to waveguide subarray antenna elements 101 numbered 5-8, thus realizing transmit-receive multiplexing of waveguide subarray antenna elements 101 numbered 5-8.

[0044] Furthermore, such as Figure 5 As shown, the interfaces of the multiple second ET power dividers 502 of the receiving channel and the interfaces of the HT power dividers 501 of the transmitting channel 103 are located on the same plane.

[0045] Furthermore, the interfaces of the multiple second ET power dividers 52 connected to the circulator port 401 are located on the same straight line.

[0046] Furthermore, the three HT power dividers 501 of the second receiving channel 105 and the three HT power dividers 501 of the first receiving channel 104 are respectively disposed on both sides of the ET power divider 502 and are located on the same plane. The three HT power dividers 501 of the second receiving channel 105 and the three HT power dividers 501 of the third receiving channel 106 are respectively disposed on both sides of the ET power divider 502 and are located on the same plane.

[0047] Similarly, the HT power divider 501 of the fourth receiving channel 107 is arranged on the same plane and on the two sides of the ET power divider 502 with the HT power dividers 501 of the third receiving channel 106 and the fifth receiving channel 108, respectively. Figure 6 As shown.

[0048] By arranging the HT power dividers 501 of the even receiving channels and the odd receiving channels on the two sides of the ET power divider 502 and staggered, the multiplexing of the ET power divider 502 is realized, and then the multiplexing of the antenna subarray is realized, the aperture utilization of the antenna is improved, and the volume and weight of the antenna are reduced.

[0049] Embodiment 2

[0050] In one specific embodiment of the present application, a broadband low-profile common-aperture multi-phase center array antenna using the feed network of embodiment 1 is provided, which comprises: the feed network for realizing subarray multiplexing in embodiment 1, the circulator combination 102, and a plurality of waveguide subarray antenna units 101. The circulator combination 102 comprises a plurality of linearly arranged circulators. The transmitting channel 103 and the plurality of receiving channels of the feed network are connected with the circulator combination 102 through the feed network, and the plurality of circulators of the circulator combination 102 are connected with the plurality of waveguide subarray antenna units 101, respectively. Each waveguide subarray antenna unit 101 forms a subarray, and each subarray is arranged at equal intervals to form a multi-phase center array antenna.

[0051] As shown in the specific embodiment of the present application, Figure 4 The circulator combination 102 comprises 12 groups of circulators. Each circulator comprises three interfaces, namely circulator one port 401, circulator two port 402, and circulator three port 403. The working principle of the circulator is as follows: a complete closed loop is formed in the direction of circulator one port 401→circulator two port 402→circulator three port 403→circulator one port 401, and the circulator closed loop is connected in the forward direction and cut off in the reverse direction.

[0052] In the present application, the plurality of waveguide subarray antenna units 101 are arranged at equal intervals to form a radiation array.

[0053] Further, each waveguide subarray antenna unit 101 comprises: a plurality of radiation units 301, a feed waveguide 302, and a first ET power divider 303. The plurality of radiation units 301 are arranged on one side of the feed waveguide 302, and the first ET power divider 303 is arranged on the other side of the feed waveguide 302. Specifically, the radiation unit 301 is in the form of a resonant cavity waveguide antenna, each radiation unit 301 comprises four radiation slots that share one resonant cavity, and the radiation unit 301 can realize electromagnetic wave radiation function. The antenna has the characteristics of wide working bandwidth, simple structure, low overall profile, and the feed waveguide 302 feeds the radiation unit 301 in the form of open slotted series feeding, thereby realizing the wideband and low profile design of the antenna.

[0054] In one specific embodiment of the present application, as shown in Figure 3 , the waveguide subarray antenna unit 101 comprises 12 radiation units 301, each radiation unit 301 comprises four radiation slots, the electromagnetic wave enters the feed waveguide 302 through the first ET power divider 303, the electromagnetic wave is fed into the radiation unit 301 through the coupling slot of the feed waveguide 302, and then the energy is radiated into space through the radiation slot.

[0055] Further, after the plurality of waveguide subarray antenna units 101 are combined with the circulator, the circulator is connected with the receiving channel and the transmitting channel 103 at the same time, thereby realizing the transceiving sharing of the waveguide subarray antenna unit 101.

[0056] In one specific embodiment of the present application, the feed network comprises: one transmitting channel 103 and five receiving channels; the transmitting channel 103 is used for radiating electromagnetic wave signals into the external space; and the receiving channels are used for accepting the electromagnetic waves propagating from the space and inputting the electromagnetic waves into the receiver of the radar.

[0057] The five receiving channels are respectively: a first receiving channel 104, a second receiving channel 105, a third receiving channel 106, a fourth receiving channel 107, and a fifth receiving channel 108.

[0058] After the five receiving channels are divided into 12 paths through the HT power divider 501, the 12 circulators of the circulator combination 102 are connected with the 12 waveguide subarray antenna units 101 respectively, and each receiving channel is connected with four waveguide subarray antenna units 101, as shown in Figure 1 . The transmitting channel 103, the first receiving channel 104, the second receiving channel 105, the third receiving channel 106, the fourth receiving channel 107, and the fifth receiving channel 108 are all realized by two levels of three HT power dividers 501 to divide one path into four paths, as shown in Figure 1 , Figure 5 , Figure 6 , Figure 7 .

[0059] Specifically, each channel is connected with four waveguide subarray antenna units 101, which are distinguished by different numbers of the connected waveguide subarray antenna units 101.

[0060] Specifically, as shown in the figure, 12 waveguide subarray antenna units 101 are numbered in sequence, in which: Figure 2

[0061] The four waveguide subarray antenna units 101 numbered 1-4 are connected with the first receiving channel 104 through a circulator;

[0062] The four waveguide subarray antenna units 101 numbered 3-6 are connected with the second receiving channel 105 through a circulator;

[0063] The four waveguide subarray antenna units 101 numbered 5-8 are connected with the third receiving channel 106 through a circulator;

[0064] The four waveguide subarray antenna units 101 numbered 6-10 are connected with the fourth receiving channel 107 through a circulator;

[0065] The four waveguide subarray antenna units 101 numbered 8-12 are connected with the fifth receiving channel 108 through a circulator;

[0066] And, the four waveguide subarray antenna units 101 numbered 4-8 are connected with the transmitting channel 103 through a circulator, as shown in the figure. Figure 1 Figure 2

[0067] In the present application, the four waveguide subarray antenna units 101 numbered 4-8 realize transceiving multiplexing, that is, simultaneously connecting the receiving channel and the transmitting channel 103. The eight waveguide subarray antenna units 101 numbered 3-10 realize receiving multiplexing, that is, simultaneously connecting two receiving channels. Specifically, the waveguide subarray antenna units 101 numbered 3 and 4 simultaneously connect the first receiving channel 104 and the second receiving channel 105; the waveguide subarray antenna units 101 numbered 5 and 6 simultaneously connect the second receiving channel 105 and the third receiving channel 106; the waveguide subarray antenna units 101 numbered 7 and 8 simultaneously connect the third receiving channel 106 and the fourth receiving channel 107; the waveguide subarray antenna units 101 numbered 9 and 10 simultaneously connect the fourth receiving channel 107 and the fifth receiving channel 108.

[0068] Further, the first ET power divider 303 output port of each waveguide subarray antenna unit 101 is connected with the circulator three port 403 of the circulator combination 102;

[0069] The transmitting channel 103 is connected with the circulator two port 402 of the circulator combination 102 through an HT power divider 501. ​​​

[0070] The receiving channel is connected to the circulator of the circulator combination 102 through the second ET power divider 502 and the circulator one port 401.

[0071] Further, the transmitting channel 103 is connected to the circulator combination 102 through the circulator two port 402, and the circulator combination 102 is connected to the four waveguide subarray antenna units 101 through the circulator three port 403, which form a transmitting subarray.

[0072] The receiving channel is connected to the circulator combination 102 through the circulator one port 401, and the circulator combination 102 is connected to the waveguide subarray antenna units 101 through the circulator three port 403, forming a receiving subarray.

[0073] Since the working principle of the circulator is: a complete closed loop is formed in the direction of circulator one port 401→circulator two port 402→circulator three port 403→circulator one port 401, and the circulator closed loop is connected in the forward direction, and is cut off in the reverse direction.

[0074] Therefore, the signal transmitting process of the low-profile common-aperture multi-phase center array antenna is: the electromagnetic signal is fed into the transmitting network from the port of the transmitting channel 103; and is divided into four paths by the two-stage three HT power dividers 501 of the transmitting network; the electromagnetic signal is transmitted to the circulator two port 402 through the HT power divider 501 of the transmitting network; and is transmitted from the circulator two port 402 to the circulator three port 403 in the circulator; and finally is transmitted to the waveguide subarray antenna units 101 from the circulator three port 403 and the first ET power divider 303 to radiate electromagnetic waves to the outside.

[0075] The signal receiving process of the low-profile common-aperture multi-phase center array antenna is: the waveguide subarray antenna units 101 receive the electromagnetic signal in space, and transmit it to the circulator three port 403 through the first ET power divider 303; the electromagnetic signal is transmitted from the circulator three port 403 to the circulator one port 401 in the circulator; the circulator one port 401 is connected to the second ET power divider 502 of the receiving network; and then the electromagnetic signal is transmitted to the receiving channel through the receiving network for signal reception.

[0076] The transmitting channel 103 is connected to the four waveguide subarray antenna units 101 through the circulator two port 402 of the circulator combination 102, which form a transmitting subarray, and the function of the transmitting channel 103 is to radiate the electromagnetic wave energy transmitted by the transmitter to space.

[0077] The four sub-channels of the third receiving channel 106 are connected to the ring one 401 of the ring group 102, and then connected to the four waveguide sub-array antenna units 101 through the ring three 403, forming a receiving sub-array; at the same time, the four sub-channels of the transmitting channel 103 are connected to the ring two 402 of the ring group 102, and then connected to the same four waveguide sub-array antenna units 101 through the ring three 403, forming a transmitting sub-array; the sub-array formed by the four waveguide sub-array antenna units 101 simultaneously serves as the receiving sub-array of the third receiving channel 106 and the transmitting sub-array of the transmitting channel 103, that is, the transceiving sharing is realized, and the key to realization is the forward connection and reverse cut-off of the ring.

[0078] Further, the first receiving channel 104, the second receiving channel 105, the fourth receiving channel 107 and the fifth receiving channel 108 are all connected to the waveguide sub-array antenna unit 101 through the ring one 401, and form four receiving sub-arrays respectively, and finally form a five-receiving multi-phase center array antenna.

[0079] The low-profile common-aperture multi-phase center array antenna of the application realizes six-channel function, each channel contains four waveguide sub-array antenna units 101, and theoretically, 24 waveguide sub-array antenna units 101 are needed for transceiving sharing, and the number of the waveguide sub-array antenna units 101 is reduced to 12 by setting the ring and the feed network, wherein the waveguide sub-array antenna units 101 numbered 5-8 realize transceiving multiplexing (simultaneously serving as receiving and transmitting units), and the eight waveguide sub-array antenna units 101 numbered 3-10 realize the multiplexing of the receiving sub-array (simultaneously serving as the receiving units of two receiving channels); the multiplexing design of the antenna sub-array is realized, and the volume of the antenna is reduced.

[0080] When implemented:

[0081] The multiplexing implementation mode of the low-profile common-aperture multi-phase center array antenna is as shown in the figure: Figure 2 There are 12 waveguide sub-array antenna units 101.

[0082] The correspondence between the numbers of the waveguide sub-array antenna units 101 and the feed network channels is as follows:

[0083] The first sub-array (receiving sub-array): the waveguide sub-array antenna units 101 numbered 1-4 correspond to the first receiving channel 104; the waveguide sub-array antenna units 101 numbered 3-6 correspond to the second receiving channel 105.

[0084] The second sub-array (transceiving multiplexing sub-array): the waveguide sub-array antenna units 101 numbered 5-8 correspond to the transceiving sharing channel, that is, the waveguide sub-array antenna units 101 numbered 5-8 simultaneously communicate with the transmitting channel 103 and the third receiving channel 106.

[0085] The third subarray (receiving subarray): the waveguide subarray antenna units 101 numbered 5-8 numbered 7-10 correspond to the fourth receiving channel 107.

[0086] The third subarray (receiving subarray): the waveguide subarray antenna units 101 numbered 5-8 numbered 9-12 correspond to the fifth receiving channel 108.

[0087] Among them, the waveguide subarray antenna units 101 numbered 5-8 are in communication with the transmitting channel 103 and the third receiving channel 106 at the same time; the transceiving multiplexing of the subarray is realized, and the efficiency of the antenna is improved.

[0088] Further, the first receiving channel 104, the second receiving channel 105, the third receiving channel 106, the fourth receiving channel 107 and the fifth receiving channel 108 are divided into four paths by the secondary three HT power dividers 501, a total of 20 paths. The second ET power divider 502 at the end of the receiving channel branch is connected with the circulator 401 of the circulator, and then connected with the waveguide subarray antenna unit 101.

[0089] Among them, the second receiving channel 105 shares the second ET power divider 502 with the first receiving channel 104 and the third receiving channel 106 on both sides, and the fourth receiving channel 107 shares the second ET power divider 502 with the third receiving channel 106 and the fifth receiving channel 108 on both sides, so that the end of the receiving channel of the feeding network is only provided with 12 second ET power dividers 502 to realize the connection between the receiving channel and the waveguide subarray antenna unit 101, realize the multiplexing of the antenna subarray, and at the same time reduce the number of waveguide subarray antenna units 101 and circulators, thereby reducing the volume of the array antenna.

[0090] In one specific embodiment of the application, the spacing between adjacent receiving channels is 30mm, as shown in Figure 5 .

[0091] Further, the 12 waveguide subarray antenna units 101 are arranged at equal intervals with a spacing of 15mm to form a radiation array, and the array structure is shown in the accompanying Figure 1 .

[0092] Compared with the prior art, the technical scheme provided by the embodiment has at least one of the following beneficial effects:

[0093] 1. The embodiment of the present application provides a broadband low profile co-polarized multi-phase center array antenna, which adopts a resonant cavity type antenna unit form, has the characteristics of wideband and low profile, simultaneously adopts a slant slit series feeding mode, saves the space of a feeding network, can conveniently realize subarray multiplexing, improves the aperture utilization rate of the antenna, and realizes the demand of a traditional antenna layout by using only half of the aperture. The present application is designed to be full waveguide, has a simple structure, a mature and reliable process, all materials are selected from aluminum substrates, and is machined and formed by vacuum brazing, and is realized by domestic products, so that dependence on imported materials can be eliminated.

[0094] 2. The present application adopts a new unit form, four slits of a resonant cavity type waveguide antenna share one resonant cavity, the antenna unit form has a wide bandwidth, and the low profile design of the antenna is realized by surrounding the resonant cavity.

[0095] 3. The slant slit series feeding mode is used for feeding the waveguide antenna, replaces the parallel feeding mode, saves the space of a feeding network, utilizes the characteristics of a circulator combination, skillfully realizes the multiplexing of multiple subarrays, and realizes the sharing of a receiving and transmitting channel.

[0096] 4. Five receiving subarrays are arranged at equal intervals to form a multi-phase center array antenna. The present application adopts a resonant cavity type antenna unit slant slit series feeding mode, can realize the wideband and low profile design of the antenna, facilitates the layout of a feeding network to form multi-phase center subarray multiplexing, improves the utilization rate of the antenna, realizes the demand of a traditional antenna layout by using only half of the aperture, and more importantly, provides a smaller size length for a forward-looking imaging radar, can effectively improve the resolution of the forward-looking imaging radar, and the Doppler shift generated by the multi-phase center provides the possibility for the realization of the forward-looking imaging technology.

[0097] The above only describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, and should be covered in the protection scope of the present application.

Claims

1. A feed network for implementing subarray multiplexing, characterized by, The application relates to a transmission network and a receiving network. The transmission network comprises one transmission channel and a first HT power divider, the first HT power divider is used for dividing the transmission channel into four paths; the receiving network comprises a plurality of receiving channels and a second HT power divider; the second HT power divider is used for dividing the receiving channel into four paths; one HT power divider can divide the signal of the transmission channel or the receiving channel into two paths; three first HT power dividers in two levels in series can divide the transmission channel into four paths; three second HT power dividers in two levels in series can divide the signal of the receiving channel into four paths; the end of the receiving network is provided with a second ET power divider, the second ET power divider is used for being combined with a circulator; the receiving channel comprises a first receiving channel, a second receiving channel, a third receiving channel, a fourth receiving channel and a fifth receiving channel; the end of the second receiving channel is provided with four second ET power dividers, the left two second ET power dividers are shared by two second ET power dividers of the first receiving channel; the right two ET power dividers are shared by two second ET power dividers of the third receiving channel; the end of the fourth receiving channel is provided with four second ET power dividers, the left two ET power dividers are shared by two second ET power dividers of the third receiving channel; the right two ET power dividers are shared by two second ET power dividers of the fifth receiving channel; three HT power dividers of the second receiving channel and three HT power dividers of the first receiving channel are respectively arranged on the two sides of the ET power dividers and are located in the same plane; similarly, the HT power dividers of the fourth receiving channel, the third receiving channel and the fifth receiving channel are respectively arranged on the two sides of the ET power dividers and are located in the same plane; the HT power dividers of the even receiving channel and the odd receiving channel are arranged on the two sides of the ET power dividers and are staggered, so that the ET power dividers are multiplexed. The receiving channel is provided with 12 second ET power dividers.

2. The feed network for implementing subarray multiplexing of claim 1, wherein, The end of the transmission channel is provided with two first HT power dividers.

3. The feed network for implementing subarray multiplexing of claim 2, wherein, The interfaces of the second ET power dividers of the receiving channel and the interfaces of the first HT power dividers of the transmission channel are located in the same plane.

4. The feed network for implementing subarray multiplexing of claim 3, wherein, The end of the transmission channel is provided with two first HT power dividers.

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