A broadband low-profile co-aperture multi-phase center array antenna

Abstract

The present invention relates to a broadband, low-profile, co-aperture, multi-phase center array antenna, which belongs to the field of antenna technology and solves the problems of low antenna aperture utilization and excessive antenna size in the prior art. The present invention comprises: a waveguide sub-array antenna unit, a circulator combination, and a feeding network; the feeding network is connected to a plurality of the waveguide sub-array antenna units via the circulator combination, a transmitting channel and a plurality of receiving channels are provided on the feeding network, and the receiving sub-arrays are arranged at equal intervals to form a multi-phase center array antenna. The present invention can realize a broadband, low-profile design of the antenna, facilitate the layout of the feeding network to form multi-phase center sub-array multiplexing, improve antenna utilization, and reduce antenna volume.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to a broadband low-profile co-aperture multi-phase center array antenna. Background Art

[0002] When the missile enters the terminal attack phase, in order to achieve precise strikes on the target, it is necessary to adopt the method of active imaging homing terminal guidance, that is, to use detection sensors to image sensitive targets in the area directly in front of the missile's flight path, extract target features through radar images for target identification, and finally obtain measurement information, and output guidance information to the missile to guide the missile to achieve precise tracking of the target and complete precise strikes on the target.

[0003] Antenna technology greatly facilitates guidance and control during the terminal attack phase of a missile, primarily used in forward-looking imaging radar technology. Radar imaging involves transmitting a designed microwave signal through a radar antenna. When the microwave signal contacts a target, it generates a scattered field. The scattered signal, containing information about the target, propagates and is received by the radar antenna. The radar beam must be aligned at a certain angle to the vehicle's flight direction to achieve the desired azimuth Doppler bandwidth. Target resolution is achieved through the use of linear frequency modulation (LFM) pulse compression technology and the azimuth Doppler generated by the relative motion between the radar and the target, ultimately yielding a high-resolution image of the ground scene in both range and azimuth.

[0004] Forward-looking imaging radar technology greatly facilitates guidance and control during the terminal attack phase of missiles. Its implementation relies primarily on antenna technology, which transmits and receives signals to image the target. Existing antennas suffer from low aperture utilization and excessive size. To obtain high-resolution images of the ground scene in both range and azimuth, a multi-phase central array antenna is required. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a broadband low-profile co-aperture multi-phase center array antenna to solve the problems of low aperture utilization and excessive antenna size in existing antennas.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] A broadband, low-profile, co-aperture, multi-phase center array antenna comprises: a waveguide sub-array antenna unit, a circulator assembly, and a feed network; the feed network is connected to a plurality of the waveguide sub-array antenna units via the circulator assembly, and a transmission channel and a plurality of reception channels are provided on the feed network.

[0008] Furthermore, there are 12 waveguide sub-array antenna units.

[0009] Furthermore, the circulator assembly is provided with a circulator port one, a circulator port two and a circulator port three.

[0010] Furthermore, the waveguide subarray antenna unit includes: a radiating unit, a feeding waveguide and a first ET power splitter; a plurality of radiating units are arranged on one side of the feeding waveguide, and the first ET power splitter is arranged on the other side of the feeding waveguide.

[0011] Furthermore, the output port of the first ET power splitter is connected to the circulator port 3 of the circulator combination;

[0012] Furthermore, the feeding network includes: a transmitting network and a receiving network.

[0013] Furthermore, a transmission channel and an HT power splitter are provided on the transmission network; the HT power splitter splits the transmission channel from one path into four paths and is connected to two ports of the circulator.

[0014] Furthermore, a plurality of second ET power splitters are provided on the receiving network; and one of the circulators is connected to the second ET power splitters.

[0015] Furthermore, the receiving network includes: a first receiving channel, a second receiving channel, a third receiving channel, a fourth receiving channel and a fifth receiving channel.

[0016] Furthermore, the first receiving channel, the second receiving channel, the third receiving channel, the fourth receiving channel and the fifth receiving channel are all divided into four channels by two stages of series connection of three HT power dividers, and are respectively connected to four waveguide sub-array antenna units.

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

[0018] Given the current requirements for anti-interference and lightweight carrier platforms, antennas are required to be broadband and low-profile. The antenna of the present invention adopts a waveguide resonant cavity unit form, which can effectively improve the antenna operating bandwidth. Through the waveguide coupling slot series feeding method, the five sub-arrays are integrated into a single aperture, realizing a low-profile common aperture design.

[0019] The length of the feed network is designed to be equal path, and the five sub-arrays can transmit and receive individually or in groups. The appropriate aperture can be selected for different application scenarios, enriching the application scenarios of the radar. At the same time, the multi-phase central sub-array reception can achieve Doppler bandwidth in azimuth, thus providing the possibility for forward-looking imaging. The antenna has the characteristics of high gain, low profile, and high polarization isolation.

[0020] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a broadband low-profile co-aperture multi-phase center array antenna;

[0023] Figure 2 This is a schematic diagram of a broadband low-profile co-aperture multi-phase center array antenna;

[0024] Figure 3 Schematic diagram of the 2×24 waveguide subarray antenna unit structure;

[0025] Figure 4 Schematic diagram of the circulator assembly structure;

[0026] Figure 5 Schematic diagram of the feeding network structure;

[0027] Figure 6 This is a schematic diagram of the transmission network structure;

[0028] Figure 7 Schematic diagram of the receiving network structure.

[0029] Reference numerals:

[0030] 101-waveguide subarray 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-feeding waveguide; 303-first ET power splitter; 401-circulator one port; 402-circulator two port; 403-circulator three port; 501-HT power splitter; 502-second ET power splitter. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0032] Example 1

[0033] A specific embodiment of the present invention provides a broadband, low-profile, co-aperture, multi-phase center array antenna, comprising: a waveguide sub-array antenna unit 101, a circulator assembly 102, and a feed network; the feed network is connected to multiple waveguide sub-array antenna units 101 via the circulator assembly 102, and a transmit channel 103 and multiple receive channels are provided on the feed network.

[0034] In a specific embodiment of the present invention, the feed network is provided with a transmitting channel 103 and five receiving channels; the transmitting channel 103 is used to radiate electromagnetic wave signals into the external space; the receiving channel is used to receive electromagnetic waves propagated in space and input them into the radar receiver.

[0035] Furthermore, there are 12 waveguide sub-array antenna units 101.

[0036] In one embodiment of the present invention, the circulator assembly 102 includes a plurality of circulators arranged linearly. The circulator assembly 102 includes 12 groups of circulators. Furthermore, each circulator includes three interfaces, namely, circulator port 1 401, circulator port 2 402, and circulator port 3 403. Figure 4 shown.

[0037] The working mode of the circulator is to form a complete closed loop in the direction of circulator port 401 → circulator port 2 402 → circulator port 3 403 → circulator port 1 401, and the circulator closed loop is connected in the forward direction and cut off in the reverse direction.

[0038] In the present invention, a plurality of waveguide sub-array antenna units 101 are arranged at equal intervals to form a radiation array.

[0039] Furthermore, each waveguide subarray antenna unit 101 includes: multiple radiating elements 301, a feeding waveguide 302, and a first ET power divider 303. Multiple radiating elements 301 are arranged on one side of the feeding waveguide 302, and the first ET power divider is arranged on the other side. Specifically, the radiating elements 301 adopt the form of a resonant cavity waveguide antenna. Each radiating element 301 includes four radiating slots, and the four radiating slots share a resonant cavity; the radiating elements 301 can realize electromagnetic wave radiation function. The characteristics of this type of antenna are wide operating bandwidth, simple structure, and low overall profile. The feeding waveguide 302 feeds the radiating elements 301 through a series feed method with inclined slots, which together constitute the broadband low-profile design of the antenna.

[0040] In a specific embodiment of the present invention, Figure 3As shown, the waveguide subarray antenna unit 101 includes 12 radiating elements 301, each radiating element 301 includes 4 radiating slots, and the electromagnetic wave enters the feeding waveguide 302 through the first ET power splitter 303. The feeding waveguide 302 feeds the electromagnetic wave into the radiating element 301 through the coupling slot, and then radiates the energy into space through the radiating slot.

[0041] In one specific embodiment of the present invention, the transmit channel 103 and multiple receive channels are connected to a circulator assembly 102 via a feed network. The multiple circulators in circulator assembly 102 are each connected to multiple waveguide subarray antenna units 101. 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. After the multiple waveguide subarray antenna units 101 are combined with the circulators, the circulators are simultaneously connected to both the receive channel and the transmit channel 103, enabling the waveguide subarray antenna units 101 to share both transmit and receive functions.

[0042] The receiving channels are: 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. The five receiving channels are respectively connected to the 12 waveguide sub-array antenna units 101 through the 12 circulators of the circulator assembly 102, and each receiving channel is connected to four waveguide sub-array antenna units 101.

[0043] In a specific embodiment of the present invention, 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 connected in two stages of three HT power dividers 501 to realize one-way division into four channels; Figure 1 The transmitting channel 103 is connected to the four waveguide sub-array antenna units 101 through the HT power splitter 501 and the circulator; a second ET power splitter 502 is set at the branch end of each receiving channel, and is respectively connected to the four waveguide sub-array antenna units 101 through the second ET power splitter 502.

[0044] Furthermore, the receiving channel is provided with a total of 12 second ET power splitters 502. Correspondingly, the circulator assembly 102 includes 12 circulators, and the waveguide sub-array antenna units 101 also have 12.

[0045] Specifically, each channel is connected to four waveguide sub-array antenna units 101 , the difference being that the numbers of the connected specific waveguide sub-array antenna units 101 are different.

[0046] Specifically, if Figure 2 As shown, the 12 waveguide sub-array antenna units 101 are numbered in sequence, where:

[0047] The four waveguide sub-array antenna units 101 numbered 1-4 are connected to the first receiving channel 104 via a circulator;

[0048] The four waveguide sub-array antenna units 101 numbered 3-6 are connected to the second receiving channel 105 via a circulator;

[0049] The four waveguide sub-array antenna units 101 numbered 5-8 are connected to the third receiving channel 106 via a circulator;

[0050] The four waveguide sub-array antenna units 101 numbered 6-10 are connected to the fourth receiving channel 107 via a circulator;

[0051] The four waveguide sub-array antenna units 101 numbered 8-12 are connected to the fifth receiving channel 108 via a circulator;

[0052] Furthermore, the four waveguide sub-array antenna units 101 numbered 4-8 are connected to the transmission channel 103 via a circulator, as shown in FIG. Figure 1 、 Figure 2 shown.

[0053] In the present invention, the four waveguide subarray antenna units 101 numbered 4-8 implement transmit-receive multiplexing, ie, simultaneously connect the receive channel and the transmit channel 103. The eight waveguide subarray antenna units 101 numbered 3-10 implement receive multiplexing, ie, simultaneously connect the two receive channels.

[0054] Specifically, the waveguide sub-array antenna units 101 numbered 3 and 4 are connected to the first receiving channel 104 and the second receiving channel 105 at the same time;

[0055] The waveguide sub-array antenna units 101 numbered 5 and 6 are connected to the second receiving channel 105 and the third receiving channel 106 at the same time;

[0056] The waveguide sub-array antenna units 101 numbered 7 and 8 are connected to the third receiving channel 106 and the fourth receiving channel 107 at the same time;

[0057] The waveguide sub-array antenna units 101 numbered 9 and 10 are connected to the fourth receiving channel 107 and the fifth receiving channel 108 at the same time.

[0058] Furthermore, in order to realize the receiving multiplexing and transmitting multiplexing of the two waveguide sub-array antenna units 101, the present invention designs the following Figure 5 、 Figure 6 、 Figure 7 The feeding network is shown.

[0059] Specifically, if Figure 5-7 As shown, the feeding network includes: a transmitting network and a receiving network.

[0060] The transmitting network includes a transmitting channel 103 and three HT power splitters 501. The HT power splitters 501 are used to split the transmitting channel 103 into four channels. The receiving network includes multiple receiving channels and HT power splitters 501. The receiving channels are split into four channels by the HT power splitters 501. Furthermore, to connect the receiving channels to the circulator, a second ET power splitter 502 is provided at each end of the receiving network. The second ET power splitter 502 is used to connect to the circulator assembly 102.

[0061] Furthermore, one HT power splitter 501 can split the signal of the transmitting channel 103 or the receiving channel into two paths; three HT power splitters 501 connected in series in two stages can split the signal of the transmitting channel 103 or the receiving channel into four paths.

[0062] Furthermore, if Figure 6 As shown, the receiving channels are divided into odd receiving channels and even receiving channels; the odd receiving channels and even receiving channels are arranged at intervals; the even receiving channels and the odd receiving channels on both sides share the second ET power splitter 502.

[0063] In a specific embodiment of the present invention, the receiving channels include: 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 .

[0064] Specifically, four second ET power splitters 502 are provided at the end of the second receiving channel 105, the two ET power splitters 502 on the left side are shared with the two second ET power splitters 502 of the first receiving channel 104; the two ET power splitters 502 on the right side are shared with the two second ET power splitters 502 of the third receiving channel 106. Four second ET power splitters 502 are provided at the end of the fourth receiving channel 107, the two ET power splitters 502 on the left side are shared with the two second ET power splitters 502 of the third receiving channel 106; the two ET power splitters 502 on the right side are shared with the two second ET power splitters 502 of the fifth receiving channel 108. Figure 6 shown.

[0065] In the present invention, by setting the second receiving channel 105 to share four ET power splitters 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 the waveguide sub-array antenna units 101 numbered 3 and 4, and the second receiving channel 105 and the third receiving channel 106 are simultaneously connected to the waveguide sub-array antenna units 101 numbered 5 and 6, thereby achieving reception multiplexing of the waveguide sub-array antenna units 101 numbered 3-6.

[0066] In the present invention, by setting the fourth receiving channel 107 to share four ET power splitters 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 the waveguide sub-array antenna units 101 numbered 7 and 8, and the fourth receiving channel 107 and the fifth receiving channel 108 share the waveguide sub-array antenna units 101 numbered 9 and 10, thereby achieving reception multiplexing of the waveguide sub-array antenna units 101 numbered 6-10.

[0067] In the present invention, two HT power splitters 501 are provided at the end of the transmit channel 103, for a total of four output ports. Transmit channel 103 is connected to circulator port 2 402, which is forward-connected to circulator port 3 403. Circulator port 3 403 is connected to waveguide sub-array antenna units 101 numbered 5-8, thus achieving transmit and receive multiplexing for these waveguide sub-array antenna units 101.

[0068] Furthermore, if Figure 5 As shown, the interfaces of the multiple second ET power splitters 502 of the receiving channel and the interface of the HT power splitter 501 of the transmitting channel 103 are located on the same plane.

[0069] Furthermore, the three HT power splitters 501 of the second receiving channel 105 and the three HT power splitters 501 of the first receiving channel 104 are respectively arranged on both sides of the ET power splitter 502 and are located in the same plane. The three HT power splitters 501 of the second receiving channel 105 and the three HT power splitters 501 of the third receiving channel 104 are respectively arranged on both sides of the ET power splitter 502 and are located in the same plane. Similarly, the HT power splitter 501 of the fourth receiving channel 107 and the HT power splitters 501 of the third receiving channel 106 and the fifth receiving channel 108 are respectively arranged on both sides of the ET power splitter 502 and are located in the same plane; Figure 6 By staggering the HT power splitters 501 for the even and odd receiving channels on both sides of the ET power splitter 502, multiplexing of the ET power splitter 502 is achieved, thereby enabling multiplexing of antenna subarrays, improving antenna aperture utilization, and reducing antenna size and weight.

[0070] Furthermore, the output port of the first ET power splitter 303 of each waveguide sub-array antenna unit 101 is connected to the circulator third port 403 of the circulator assembly 102 .

[0071] The transmitting channel 103 is connected to the circulator port 402 of the circulator assembly 102 through the HT power splitter 501 .

[0072] The receiving channel is connected to the circulator port 401 of the circulator assembly 102 via the second ET power splitter 502 .

[0073] Furthermore, the transmitting channel 103 is connected to the circulator assembly 102 via the circulator port 2 402 , and the circulator assembly 102 is connected to the four waveguide sub-array antenna units 101 via the circulator port 3 403 . The circulator port 2 402 is forwardly connected to the circulator port 3 403 , and the four waveguide sub-array antenna units 101 constitute a transmitting sub-array.

[0074] The receiving channel is connected to the circulator assembly 102 through the circulator port 401, and the circulator assembly 102 is connected to the waveguide sub-array antenna unit 101 through the circulator port 3 403. The circulator port 3 403 is forwardly connected to the circulator port 401 to form a receiving sub-array.

[0075] The working mode of the circulator is to form a complete closed loop in the direction of circulator port 401 → circulator port 2 402 → circulator port 3 403 → circulator port 1 401 , and the circulator closed loop is connected in the forward direction and cut off in the reverse direction.

[0076] The signal transmission process of the low-profile co-aperture multi-phase center array antenna is as follows:

[0077] The electromagnetic signal is fed into the transmitting network from the port of the transmitting channel 103; and is divided into four paths through the three HT power splitters 501 of the transmitting network in two stages connected in series; the electromagnetic signal is transmitted to the circulator second port 402 through the HT power splitter 501 of the transmitting network; and is transmitted in the circulator from the circulator second port 402 to the circulator third port 403 in the forward direction; finally, it is transmitted to the waveguide sub-array antenna unit 101 through the circulator third port 403 and the first ET power splitter 303 to radiate electromagnetic waves to the outside.

[0078] The signal reception process of the low-profile co-aperture multi-phase center array antenna is as follows:

[0079] The waveguide subarray antenna unit 101 receives an electromagnetic signal in space and transmits it to the circulator's third port 403 via the first ET power splitter 303. Within the circulator, the electromagnetic signal is transmitted from the circulator's third port 403 to the circulator's first port 401. The circulator's first port 401 is connected to the second ET power splitter 502 of the receiving network. The electromagnetic signal is then transmitted to the receiving channel via the receiving network for signal reception.

[0080] When implementing:

[0081] The transmitting channel 103 is connected to the circulator assembly 102 through the circulator port 402, and further connected to the four waveguide sub-array antenna units 101. The four waveguide sub-array antenna units 101 constitute a transmitting sub-array. The function of the transmitting channel 103 is to radiate the electromagnetic wave energy emitted by the transmitter into space.

[0082] The four branches of the third receiving channel 106 are connected to the circulator port 1 401 of the circulator assembly 102, and then connected to the four waveguide sub-array antenna units 101 through the circulator port 3 403. Circulator port 3 403 is forward-connected to the circulator port 1 401, forming a receiving sub-array. Simultaneously, the four branches of the transmitting channel 103 are connected to the circulator port 2 402, and then connected to the same four waveguide sub-array antenna units 101 through the circulator port 3 403. Circulator port 2 402 is forward-connected to the circulator port 3 403, forming a transmitting sub-array. The sub-array formed by the four waveguide sub-array antenna units 101 serves as both the receiving sub-array of the third receiving channel 106 and the transmitting sub-array of the transmitting channel 103, thus achieving shared transmission and reception. The key to this is the forward connection of the circulator and the reverse blocking.

[0083] Furthermore, 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 a circulator port 401, forming four receiving sub-arrays respectively, and ultimately forming a one-transmit-five-receive multi-phase center array antenna.

[0084] The reuse of low-profile co-aperture multi-phase center array antenna is achieved by Figure 2 As shown: there are 12 waveguide sub-array antenna units 101.

[0085] The corresponding relationship between the numbering of the waveguide subarray antenna unit 101 and the feed network channel is:

[0086] First sub-array (receiving sub-array): the waveguide sub-array antenna units 101 numbered 1 to 4 correspond to the first receiving channel 104 ; the waveguide sub-array antenna units 101 numbered 3 to 6 correspond to the second receiving channel 105 .

[0087] Second subarray (transmit / receive multiplexing subarray): The waveguide subarray antenna units 101 numbered 5 to 8 correspond to the transmit / receive shared channel, that is, the waveguide subarray antenna units 101 numbered 5 to 8 are connected to both the transmit channel 103 and the third receive channel 106 .

[0088] Third sub-array (receiving sub-array): The waveguide sub-array antenna units 101 numbered 5 to 8 and numbered 7 to 10 correspond to the fourth receiving channel 107 .

[0089] Third sub-array (receiving sub-array): The waveguide sub-array antenna units 101 numbered 5 to 8 and numbered 9 to 12 correspond to the fifth receiving channel 108 .

[0090] The waveguide sub-array antenna units 101 numbered 5 to 8 are simultaneously connected to the transmitting channel 103 and the third receiving channel 106 , thereby realizing the sub-array transmission and reception multiplexing and improving the efficiency of the antenna.

[0091] Furthermore, 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 split into four channels through three secondary HT power splitters 501, for a total of 20 channels. A second ET power splitter 502 is provided at the end of each receiving channel branch to connect to the circulator port 401 of the circulator, and further to the waveguide subarray antenna unit 101.

[0092] The second receiving channel 105 shares the second ET power splitter 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 splitter 502 with the third receiving channel 106 and the fifth receiving channel 108 on both sides. This allows the end branch of the receiving channel of the feed network to be connected to the waveguide subarray antenna unit 101 by only having 12 second ET power splitters 502, thereby achieving antenna subarray multiplexing and reducing the number of waveguide subarray antenna units 101 and circulators, thereby reducing the volume of the array antenna.

[0093] In a specific embodiment of the present invention, the spacing between adjacent receiving channels is 30 mm. Figure 5 shown.

[0094] Furthermore, 12 waveguide sub-array antenna units 101 are arranged at equal intervals of 15 mm to form a radiation array. The array structure is shown in the attached figure. Figure 1 shown.

[0095] Compared with the prior art, the technical solution provided by this embodiment has at least one of the following beneficial effects:

[0096] 1. Embodiments of the present invention provide a broadband, low-profile, co-aperture, multi-phase center array antenna. This antenna utilizes resonant cavity antenna elements, offering broadband, low-profile characteristics. It also employs a slanted slot series feed method, which saves feed network space, facilitates subarray reuse, and improves antenna aperture utilization, meeting the requirements of traditional antenna layouts using only half the aperture area. This fully waveguide design boasts a simple structure and mature, reliable manufacturing processes. All materials are domestically manufactured, using aluminum substrates machined and vacuum brazed, eliminating dependence on imported materials.

[0097] 2. The present invention adopts a new unit form. The four slots of the resonant cavity waveguide antenna share a resonant cavity. The antenna unit bandwidth of this form is relatively wide, and the low-profile design of the antenna is achieved by surrounding the resonant cavity. The present invention provides a broadband co-aperture multi-phase center array antenna with high gain, low profile, and high polarization isolation. The low-profile co-aperture multi-phase center array antenna of the present invention realizes six-channel function. Each channel contains 4 waveguide sub-array antenna units 101. Theoretically, a total of 24 waveguide sub-array antenna units 101 are required for transmission and reception. The present invention reduces the number of the waveguide sub-array antenna units 101 to 12 by setting a circulator and a feeding network. Among them, the waveguide sub-array antenna units 101 numbered 5-8 realize transceiver multiplexing (serving as receiving and transmitting units at the same time), and the 8 waveguide sub-array antenna units 101 numbered 3-10 realize the multiplexing of the receiving sub-array (serving as receiving units of two receiving channels at the same time); thus, the multiplexing design of the antenna sub-array is realized, and the volume of the antenna is reduced.

[0098] 3. The present invention adopts the slanted slot series feeding method to feed the waveguide antenna, replacing the parallel feeding method, saving the feeding network space, and utilizing the characteristics of the circulator combination to cleverly realize the multiplexing of multiple sub-arrays and realize the sharing of transmitting and receiving channels.

[0099] 4. The five receiving subarrays of the present invention are arranged at equal intervals, forming a multi-phase center array antenna. This invention utilizes a resonant cavity antenna unit with slanted slots in series feeding, enabling a broadband, low-profile antenna design. This facilitates feed network layout to multiplex multi-phase center subarrays, improving antenna utilization. This achieves the requirements of a traditional antenna layout using only half the aperture area. More importantly, it provides a smaller length for forward-looking imaging radar, effectively improving its directional resolution. The Doppler shift generated by the multi-phase center enables the implementation of forward-looking imaging technology.

[0100] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A broadband low-profile co-aperture multi-phase center array antenna, characterized in that: include: A waveguide subarray antenna unit (101), a circulator assembly (102) and a feed network; The feed network is connected to the plurality of waveguide sub-array antenna units (101) via the circulator assembly (102), and a transmission channel (103) and a plurality of receiving channels are provided on the feed network; The circulator assembly (102) is provided with a circulator port one (401), a circulator port two (402) and a circulator port three (403); The waveguide subarray antenna unit (101) comprises: a radiation unit (301), a feeding waveguide (302) and a first ET power splitter (303); a plurality of radiation units (301) are arranged on one side of the feeding waveguide (302), and a first ET power splitter (303) is arranged on the other side of the feeding waveguide (302); an output port of the first ET power splitter (303) is connected to the circulator three ports (403) of the circulator assembly (102); The feeding network includes: a transmitting network and a receiving network; A transmission channel (103) and an HT power splitter (501) are provided on the transmission network; the HT power splitter (501) splits the transmission channel (103) from one channel into four channels and is connected to the second port (402) of the circulator; a plurality of second ET power splitters (502) are provided on the receiving network; the first port (401) of the circulator is connected to the second ET power splitter (502); The receiving network comprises: 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); 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 connected in two stages in series through three HT power dividers (501) to realize one-way division into four-way divisions; a second ET power divider (502) is provided at the branch end of each receiving channel, and each is connected to the waveguide sub-array antenna unit (101) through the second ET power divider (502); the second receiving channel (105) is provided to share four second ET power dividers (502) with the first receiving channel (104) and the third receiving channel (106); and the fourth receiving channel (107) is provided to share four second ET power dividers (502) with the third receiving channel (106) and the fifth receiving channel (108).

2. The broadband low-profile co-aperture multi-phase center array antenna according to claim 1, characterized in that: There are 12 waveguide sub-array antenna units (101).

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