A broadband low-profile cosecant-squared phased array antenna

Abstract

The application discloses a broadband low-profile cotangent square phased array antenna, which comprises a feed network and a radiation network. The feed network is used for converting an input excitation signal into an electromagnetic wave with a required amplitude distribution and phase distribution and then transmitting the electromagnetic wave to the radiation network. The radiation network is used for radiating the electromagnetic wave transmitted by the feed network to free space. The feed network is a hybrid feed network based on a waveguide structure and a coaxial structure. The cotangent square phased array antenna has the advantages of wide bandwidth, high efficiency, low loss and low profile.

Description

Technical Field

[0001] The present invention relates to a cosecant square phased array antenna, in particular to a broadband low-profile cosecant square phased array antenna. Background Art

[0002] Phased array radar is a radar system that integrates communication and perception capabilities. It can achieve wireless communication and radar perception functions by adjusting parameters such as the beam direction, shape and power of wireless signals.

[0003] Phased array radar antennas can use a typical beamforming method, the cosecant square distribution, to increase their gain. Existing cosecant square beamforming antennas are a commonly used type of beamforming antenna. Their radiation beam shape in the elevation direction resembles a squared cosine function. The cosecant square equation is used to modify the antenna gain based on the target's angle of incidence, improving the radar's detection and tracking capabilities.

[0004] To achieve cosecant squared shaping for phased array antennas, a series or parallel feeding network is typically used to achieve the required envelope characteristics in the elevation plane. Using series feeding helps reduce antenna complexity. For example, the paper "Proactive conformal waveguide slot array antenna to synthesize cosecant squared pattern based on 3-D printing manufacturing process" describes an active conformal air waveguide slot array antenna based on a 3D printing manufacturing process. This antenna actively bends the shape of the array elements to control their phase, creating the desired cosecant squared far-field pattern. However, this air waveguide slot array antenna uses a series-fed standing wave propagation method, which limits its operating bandwidth to only near the center frequency, resulting in a narrow bandwidth. The feed network has a high profile, resulting in a high overall structural profile. Furthermore, it requires the installation of an additional feed source for excitation, resulting in high losses and low efficiency. Currently, some cosecant-squared antennas based on parallel feeding to control the output amplitude and phase parameters of each stage have been proposed. The feeding network structure of the document "Design and fabrication of an efficient metallic phased array for TACAN application" is composed of a cascade of multiple stages of all-metal Wilkins power dividers, realizing a cosecant-squared beam in the range of 950-1250 MHz (relative bandwidth 27%). Its feeding network structure is complex and occupies a large space. The antenna radiation is directly connected to the vertical feeding network. The overall cross-section height exceeds the center frequency 1.4λ0, the overall cross-section is high, the efficiency is low, and the loss is high. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide a broadband, low-profile cosecant square phased array antenna with wide bandwidth, high efficiency, low loss and low profile.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a broadband, low-profile cosecant square phased array antenna, including a feeding network and a radiating network, wherein the feeding network is used to convert the input excitation signal into an electromagnetic wave with the required amplitude distribution and phase distribution and then transmit it to the radiating network, and the radiating network is used to radiate the electromagnetic wave transmitted thereto by the feeding network into free space, and the feeding network is a hybrid feeding network based on a waveguide structure and a coaxial structure.

[0007] The feeding network includes a first waveguide feeding network, a second waveguide feeding network and a third waveguide feeding network. The first waveguide feeding network is used to access the excitation signal input from the outside, and perform beam coupling and phase shift shaping processing on the excitation signal before transmitting it to the second waveguide feeding network. The second waveguide feeding network is used to further perform beam coupling and phase shift shaping processing on the excitation signal transmitted thereto and then transmit it to the third waveguide feeding network. The third waveguide feeding network is used to transmit the excitation signal transmitted thereto to the radiation network.

[0008] The first waveguide feeding network includes a first metal plate, three couplers, three phase shifters, three absorbing devices, three short-circuit blocks and eight double-ridged waveguide adapters. The first metal plate is a rectangular parallelepiped structure. The length direction of the first metal plate is used as the left-right direction, the width direction is used as the front-back direction, and the height direction is used as the up-down direction. The three couplers, three phase shifters, three absorbing devices, three short-circuit blocks and eight double-ridged waveguide adapters of the first waveguide feeding network are respectively arranged on the first metal plate; the three couplers in the first waveguide feeding network each have four ports, which are respectively referred to as the first port, the second port, the third port and the fourth port. The three couplers in the first waveguide feeding network are respectively referred to as the first port, the second port, the third port and the fourth port. The couplers are respectively referred to as the first coupler, the second coupler and the third coupler, the three phase shifters in the first waveguide feeding network each have two ports, the two ports are respectively referred to as the first port and the second port, the three phase shifters in the first waveguide feeding network are respectively referred to as the first phase shifter, the second phase shifter and the third phase shifter, the three absorbing devices in the first waveguide feeding network each have two ports, the two ports are respectively referred to as the first port and the second port, the three absorbing devices in the first waveguide feeding network are respectively referred to as the first absorbing device, the second absorbing device and the third absorbing device, the three short-circuit blocks in the first waveguide feeding network are respectively referred to as the first short-circuit block, the second short-circuit block and the third short-circuit block. The eight double-ridged waveguide adapters in the first waveguide feeding network each have an input port and an output port. The eight double-ridged waveguide adapters in the first waveguide feeding network are respectively referred to as a first double-ridged waveguide adapter, a second double-ridged waveguide adapter, a third double-ridged waveguide adapter, a fourth double-ridged waveguide adapter, a fifth double-ridged waveguide adapter, a sixth double-ridged waveguide adapter, a seventh double-ridged waveguide adapter, and an eighth double-ridged waveguide adapter. The input port of the first double-ridged waveguide adapter is connected to the first port of the first phase shifter, the second port of the first phase shifter is connected to the fourth port of the first coupler, the third port of the first coupler is connected to the first port of the first absorber, and the first absorber The device is used to absorb energy from the third port of the first coupler. The second port of the first absorbing device is connected to the first short-circuit block. The first short-circuit block is used to isolate energy from the second port of the first absorbing device. The output port of the third double-ridged waveguide adapter is connected to the second port of the first coupler. The input port of the second double-ridged waveguide adapter is connected to the first port of the first coupler. The output port of the fourth double-ridged waveguide adapter is connected to the input port of the third double-ridged waveguide adapter. The fourth port of the second coupler is connected to the input port of the fourth double-ridged waveguide adapter. The first port of the second absorbing device is connected to the second port of the second coupler.The second absorbing device is used to absorb energy from the second port of the second coupler. The second port of the second absorbing device is connected to the second short-circuit block. The second short-circuit block is used to isolate energy from the second port of the second absorbing device. The second port of the second phase shifter is connected to the first port of the second coupler. The first port of the second phase shifter is connected to the input port of the fifth double-ridged waveguide adapter. The output port of the fifth double-ridged waveguide adapter is connected to the input port of the sixth double-ridged waveguide adapter. The output port of the sixth double-ridged waveguide adapter is connected to the first port of the third coupler. The input port of the seventh double-ridged waveguide adapter is connected to the second port of the third coupler. The first port of the third phase shifter is connected to the third port of the third coupler. The fourth port of the third coupler is connected to the second port of the third absorbing device. The third wave absorbing device is used to absorb energy from the fourth port of the third coupler. The first port of the third wave absorbing device is connected to the third short-circuit block, which is used to isolate energy from the first port of the third wave absorbing device. The input port of the eighth double-ridged waveguide adapter is connected to the second port of the third phase shifter. The output port of the first double-ridged waveguide adapter is the first output port of the first waveguide feeding network. The output port of the second double-ridged waveguide adapter is the second output port of the first waveguide feeding network. The output port of the seventh double-ridged waveguide adapter is the third output port of the first waveguide feeding network. The output port of the eighth double-ridged waveguide adapter is the fourth output port of the first waveguide feeding network. The four output ports of the first waveguide feeding network are used to transmit signals to the second waveguide feeding network.

[0009] The second waveguide feeding network includes a second metal plate, four short-circuit blocks, four absorbing devices, four couplers, four phase shifters and fourteen double-ridge waveguide adapters. The second metal plate is a rectangular parallelepiped structure, and its length direction is along the left-right direction, the width direction is along the front-back direction, and the height direction is along the up-down direction. The second metal plate is located on the rear side of the first metal plate, the front end face of the second metal plate is in contact with the rear end face of the first metal plate, the left end face of the second metal plate is in the same plane as the left end face of the first metal plate, and the right end face of the second metal plate is in the same plane as the right end face of the first metal plate. The upper end surface of the second metal plate and the upper end surface of the first metal plate are located in the same plane, and the lower end surface of the second metal plate and the lower end surface of the first metal plate are located in the same plane; the four couplers in the second waveguide feeding network each have four ports, and the four ports are respectively referred to as the first port, the second port, the third port and the fourth port; the four couplers in the second waveguide feeding network are respectively referred to as the fourth coupler, the fifth coupler, the sixth coupler and the seventh coupler; the four phase shifters in the second waveguide feeding network each have two ports, and the two ports are respectively referred to as the first The four phase shifters in the second waveguide feeding network are respectively referred to as the fourth phase shifter, the fifth phase shifter, the sixth phase shifter and the seventh phase shifter. The four absorbing devices in the second waveguide feeding network each have two ports, which are respectively referred to as the first port and the second port. The four absorbing devices in the second waveguide feeding network are respectively referred to as the fourth absorbing device, the fifth absorbing device, the sixth absorbing device and the seventh absorbing device. The four short-circuit blocks in the second waveguide feeding network are respectively referred to as the fourth short-circuit block, the fifth short-circuit block, the sixth short-circuit block and the seventh short-circuit block. The fourteen double-ridged waveguide adapters in the electrical network each have an input port and an output port; the fourteen double-ridged waveguide adapters in the second waveguide feeding network are respectively referred to as the ninth double-ridged waveguide adapter, the tenth double-ridged waveguide adapter, the eleventh double-ridged waveguide adapter, the twelfth double-ridged waveguide adapter, the thirteenth double-ridged waveguide adapter, the fourteenth double-ridged waveguide adapter, the fifteenth double-ridged waveguide adapter, the sixteenth double-ridged waveguide adapter, the seventeenth double-ridged waveguide adapter, the eighteenth double-ridged waveguide adapter, the nineteenth double-ridged waveguide adapter, the twentieth double-ridged waveguide adapter, the twenty-first ridged waveguide adapter, and the twenty-second double-ridged waveguide adapter;The fourth short-circuit block is connected to the first port of the fourth absorbing device to isolate energy from the first port of the fourth absorbing device. The second port of the fourth absorbing device is connected to the first port of the fourth coupler to absorb energy from the first port of the fourth coupler. The output port of the ninth double-ridged waveguide adapter is connected to the fourth port of the fourth coupler. The input port of the tenth double-ridged waveguide adapter and the input port of the twelfth double-ridged waveguide adapter are both connected to the third port of the fourth coupler. The first port of the fourth phase shifter is connected to the second port of the fourth coupler. The second port of the fourth phase shifter is connected to the input port of the thirteenth double-ridged waveguide adapter. The input port of the eleventh double-ridged waveguide adapter is connected to the fourth port of the fifth coupler. The input port of the fourteenth double-ridged waveguide adapter is connected to the third port of the fifth coupler. The fifth short-circuit block is connected to the first port of the fifth absorbing device to isolate energy from the first port of the fifth absorbing device. The first port of the fifth phase shifter is connected to the second port of the fifth coupler. The second port of the fifth absorbing device is connected to the third port of the fifth coupler. The first port is connected to absorb energy from the first port of the fifth coupler, the sixth short-circuit block is connected to the second port of the sixth absorbing device to isolate energy from the second port of the sixth absorbing device, the second port of the sixth phase shifter is connected to the first port of the sixth coupler, the first port of the sixth absorbing device is connected to the second port of the sixth coupler to absorb energy from the second port of the sixth coupler, the input port of the nineteenth double-ridged waveguide adapter is connected to the third port of the sixth coupler, the input port of the seventeenth double-ridged waveguide adapter is connected to the fourth port of the sixth coupler, the input port of the sixteenth double-ridged waveguide adapter is connected to the first port of the sixth phase shifter, the input port of the eighteenth double-ridged waveguide adapter is connected to the first port of the seventh phase shifter, the second port of the seventh phase shifter is connected to the first port of the seventh coupler, the first port of the seventh absorbing device is connected to the second port of the seventh coupler to absorb energy from the second port of the seventh coupler, and the seventh short-circuit block is connected to the second port of the seventh absorbing device to isolate energy from the second port of the seventh absorbing device;The input port of the twenty-first double-ridge waveguide adapter is connected to the third port of the seventh coupler, the input port of the twentieth double-ridge waveguide adapter and the input port of the twenty-second double-ridge waveguide adapter are connected to the fourth port of the seventh coupler, the input port of the ninth double-ridge waveguide adapter is the first input port of the second waveguide feeding network, and is connected to the first output port of the first waveguide feeding network, the input port of the eleventh double-ridge waveguide adapter is the second input port of the second waveguide feeding network, and is connected to the second output port of the first waveguide feeding network, the input port of the nineteenth double-ridge waveguide adapter is the third input port of the second waveguide feeding network, and is connected to the third output port of the first waveguide feeding network, the input port of the twenty-first double-ridge waveguide adapter is the fourth input port of the second waveguide feeding network, and is connected to the fourth output port of the first waveguide feeding network; the output port of the tenth double-ridge waveguide adapter is the first output port of the second waveguide feeding network, and the output port of the twelfth double-ridge waveguide adapter is the The output port is the second output port of the second waveguide feeding network, the output port of the thirteenth double-ridge waveguide adapter is the third output port of the second waveguide feeding network, the output port of the fourteenth double-ridge waveguide adapter is the fourth output port of the second waveguide feeding network, the output port of the fifteenth double-ridge waveguide adapter is the fifth output port of the second waveguide feeding network, the output port of the sixteenth double-ridge waveguide adapter is the sixth output port of the second waveguide feeding network, the output port of the seventeenth double-ridge waveguide adapter is the seventh output port of the second waveguide feeding network, the output port of the eighteenth double-ridge waveguide adapter is the eighth output port of the second waveguide feeding network, the output port of the twentieth double-ridge waveguide adapter is the ninth output port of the second waveguide feeding network, and the output port of the twenty-second double-ridge waveguide adapter is the tenth output port of the second waveguide feeding network. The first output port to the tenth output port of the second waveguide feeding network are used to transmit signals to the third waveguide feeding network.

[0010] The third waveguide feeding network includes a third metal plate, two one-to-nine power splitters, six one-to-three power splitters, two one-to-two power splitters and ten double-ridge waveguide adapters. The third metal plate is a rectangular parallelepiped structure, and its length direction is along the left-right direction, the width direction is along the front-to-back direction, and the height direction is along the up-down direction. The third metal plate is located on the rear side of the second metal plate, and the front end face of the third metal plate is fixed to the rear end face of the second metal plate and is in a bonded state. The left end face of the third metal plate is located in the same plane as the left end face of the second metal plate, the right end face of the third metal plate is located in the same plane as the right end face of the second metal plate, the upper end face of the third metal plate is located in the same plane as the upper end face of the second metal plate, and the lower end face of the third metal plate is located in the same plane as the lower end face of the second metal plate; two one-to-nine power splitters, six one-to-three power splitters, two one-to-two power splitters, and ten double-ridge waveguide adapters are all arranged on the third metal plate, and two one-to-nine power splitters each have a input port and nine output ports, the two one-to-nine power splitters are called the first one-to-nine power splitter and the second one-to-nine power splitter respectively, the two one-to-two power splitters each have one input port and two output ports, the two one-to-two power splitters are called the first one-to-two power splitter and the second one-to-two power splitter respectively, the six one-to-three power splitters each have one input port and three output ports, the six one-to-three power splitters are called the first one-to-three power splitter, the second one-to-three power splitter, the third one-to-three power splitter, the fourth one-to-three power splitter, and the fifth one-to-three power splitter respectively. a three-way power splitter and a sixty-one-way three-way power splitter, the ten double-ridged waveguide adapters each having an input port and an output port, and the ten double-ridged waveguide adapters are respectively referred to as a twenty-third double-ridged waveguide adapter, a twenty-fourth double-ridged waveguide adapter, a twenty-fifth double-ridged waveguide adapter, a twenty-sixth double-ridged waveguide adapter, a twenty-seventh double-ridged waveguide adapter, a twenty-eighth double-ridged waveguide adapter, a twenty-ninth double-ridged waveguide adapter, a thirtieth double-ridged waveguide adapter, a thirty-first double-ridged waveguide adapter, and a thirty-second double-ridged waveguide adapter;The output port of the twenty-third dual-ridge waveguide adapter is connected to the input port of the first one-to-nine power splitter, the output port of the twenty-fourth dual-ridge waveguide adapter is connected to the input port of the first one-to-three power splitter, the output port of the twenty-fifth dual-ridge waveguide adapter is connected to the input port of the second one-to-three power splitter, the output port of the twenty-sixth dual-ridge waveguide adapter is connected to the input port of the third one-to-three power splitter, the output port of the twenty-seventh dual-ridge waveguide adapter is connected to the input port of the first one-to-two power splitter, the output port of the thirty-second dual-ridge waveguide adapter is connected to the input port of the second one-to-nine power splitter, the output port of the thirty-first dual-ridge waveguide adapter is connected to the input port of the sixth one-to-three power splitter, the output port of the thirtieth dual-ridge waveguide adapter is connected to the input port of the fifth one-to-three power splitter, the output port of the thirty-first dual-ridge waveguide adapter is connected to the input port of the fourth one-to-three power splitter, and the output port of the thirty-second dual-ridge waveguide adapter is connected to the input port of the second one-to-two power splitter.The input port of the twenty-third double-ridge waveguide adapter is the first input port of the third waveguide feeding network, the input port of the twenty-fourth double-ridge waveguide adapter is the second input port of the third waveguide feeding network, the input port of the twenty-fifth double-ridge waveguide adapter is the third input port of the third waveguide feeding network, the input port of the twenty-sixth double-ridge waveguide adapter is the fourth input port of the third waveguide feeding network, the input port of the twenty-seventh double-ridge waveguide adapter is the fifth input port of the third waveguide feeding network, and the The input port of the twenty-eighth double-ridge waveguide adapter is the sixth input port of the third waveguide feeding network, the input port of the twenty-ninth double-ridge waveguide adapter is the seventh input port of the third waveguide feeding network, the input port of the thirtieth double-ridge waveguide adapter is the eighth input port of the third waveguide feeding network, the input port of the thirty-first double-ridge waveguide adapter is the ninth input port of the third waveguide feeding network, the input port of the thirty-second double-ridge waveguide adapter is the tenth input port of the third waveguide feeding network, and the input port of the third a first input port of the waveguide feeding network connected to the first output port of the second waveguide feeding network, a second input port of the third waveguide feeding network connected to the second output port of the second waveguide feeding network, a third input port of the third waveguide feeding network connected to the third output port of the second waveguide feeding network, a fourth input port of the third waveguide feeding network connected to the fourth output port of the second waveguide feeding network, a fifth input port of the third waveguide feeding network connected to the fifth output port of the second waveguide feeding network, a sixth input port of the third waveguide feeding network connected to the sixth output port of the second waveguide feeding network, a seventh input port of the third waveguide feeding network connected to the seventh output port of the second waveguide feeding network, an eighth input port of the third waveguide feeding network connected to the eighth output port of the second waveguide feeding network, a ninth input port of the third waveguide feeding network connected to the ninth output port of the second waveguide feeding network, and a tenth input port of the third waveguide feeding network connected to the tenth output port of the second waveguide feeding network;The nine output ports of the first one-to-nine power splitter, the three output ports of the first one-to-three power splitter, the three output ports of the second one-to-three power splitter, the three output ports of the third one-to-three power splitter, the two output ports of the first one-to-two power splitter, the two output ports of the second one-to-two power splitter, the three output ports of the fourth one-to-three power splitter, the three output ports of the fifth one-to-three power splitter, the three output ports of the sixth one-to-three power splitter, and the nine output ports of the second one-to-nine power splitter, totaling forty output ports, serve as the forty output ports of the third waveguide feeding network, for outputting signals to the radiating network.

[0011] The radiation network includes a fourth metal plate and forty radiation units arranged on the fourth metal plate. The fourth metal plate is a rectangular parallelepiped structure. The length direction of the fourth metal plate is along the left-right direction, the width direction is along the front-back direction, and the height direction is along the up-down direction. The fourth metal plate is located above the first metal plate, the second metal plate and the third metal plate. The front end face of the fourth metal plate is flush with the front end face of the first metal plate, the rear end face of the fourth metal plate is flush with the rear end face of the first metal plate, the front end face of the fourth metal plate is flush with the front end face of the first metal plate, and the rear end face of the fourth metal plate is flush with the rear end face of the third metal plate. The lower end surface of the fourth metal plate is fixedly connected to the upper end surface of the first metal plate, the upper end surface of the second metal plate and the upper end surface of the third metal plate, and is in a fitted state. Forty radiation units are evenly spaced along a row from left to right; each of the radiation units includes a first cavity, a second cavity, a first metal block, a second metal block, a third metal block, a fourth metal block, a fifth metal block, a sixth metal block, a seventh metal block, an eighth metal block and an input cavity, the first cavity, the second cavity, the first metal block, the second metal block, the third metal block, the fourth metal block, the fifth metal block, the sixth metal block, the seventh metal block, the eighth metal block and the input cavity. The input cavities are all rectangular structures, and the length directions of the first cavity, the second cavity, the first metal block, the second metal block, the third metal block, the fourth metal block, the fifth metal block, the sixth metal block, the seventh metal block, the eighth metal block and the input cavity are all along the left-right direction, the width directions are all along the front-back direction, and the height directions are all along the up-down direction; the first cavity and the second cavity are respectively opened on the fourth metal plate, the first cavity is located above the second cavity, the upper end surface of the first cavity is flush with the upper end surface of the fourth metal plate, and the lower end surface of the first cavity is connected to the upper end surface of the second cavity and is in contact with it. In the closed state, the front end face of the first cavity is flush with the front end face of the fourth metal plate, the rear end face of the first cavity is flush with the rear end face of the fourth metal plate, the lower end face of the second cavity is located above the lower end face of the fourth metal plate, the length of the second cavity is smaller than the length of the first cavity, the width of the second cavity is smaller than the width of the first cavity, the plane that makes the first cavity bilaterally symmetrical is called the first symmetry plane, the second cavity is bilaterally symmetrical with respect to the first symmetry plane, the plane that makes the first cavity front-to-back symmetry is called the second symmetry plane, the second cavity is front-to-back symmetry with respect to the second symmetry plane, and the first metal block is located in the first cavity.The upper end face of the first metal block is located below the upper end face of the first cavity, the lower end face of the first metal block and the lower end face of the first cavity are located in the same plane, the width of the first metal block is smaller than the width of the second cavity, the right end face of the first metal block and the right end face of the first cavity are located in the same plane, the left end face of the first metal block is located on the left side of the plane where the right end face of the second cavity is located and on the right side of the first symmetry plane, the first metal block is symmetrical front to back about the second symmetry plane, the second metal block is located in the first cavity, the second metal block is located on the left side of the first metal block, and the upper end face of the second metal block is located on the left side of the first symmetry plane. The upper end face of the first metal block is below the plane where the lower end face of the second metal block is located, the lower end face of the second metal block is located in the same plane as the lower end face of the first metal block, the right end face of the second metal block is connected to the left end face of the first metal block, and is in a fitted state, the width of the second metal block is equal to the width of the first metal block, the second metal block is symmetrical front to back about the second symmetry plane, and the right end face of the second metal block is located on the left side of the first symmetry plane; the third metal block is located in the second cavity, the upper end face of the third metal block is flush with the upper end face of the second cavity, the upper end face of the third metal block is flush with the lower end face of the first metal block and the second metal block The lower end surfaces are all connected and in a fitted state, the front end surface of the third metal block is located in the same plane as the front end surface of the first metal block, the rear end surface of the third metal block is located in the same plane as the rear end surface of the first metal block, the right end surface of the third metal block is located in the same plane as the right end surface of the second cavity, the left end surface of the third metal block is located on the left side of the plane where the left end surface of the second metal block is located and on the right side of the first symmetry plane, the fourth metal block is located in the second cavity, the fourth metal block is located below the third metal block, the upper end surface of the fourth metal block is connected to the lower end surface of the third metal block and in a fitted state, the right end of the fourth metal block The surface of the fourth metal block is located in the same plane as the right end surface of the second metal block, the left end surface of the fourth metal block is located in the same plane as the left end surface of the third metal block, the rear end surface of the fourth metal block is flush with the rear end surface of the third metal block, the front end surface of the fourth metal block is flush with the front end surface of the third metal block, the lower end surface of the fourth metal block is located above the lower end surface of the second cavity, the fifth metal block is located in the second cavity, the fifth metal block is located below the fourth metal block, the upper end surface of the fifth metal block is connected to the lower end surface of the fourth metal block, and is in a fitted state, and the lower end surface of the fifth metal block is located in the same plane as the lower end surface of the second cavity.The right end face of the fifth metal block is located in the same plane as the right end face of the fourth metal block, the left end face of the fifth metal block is located in the same plane as the left end face of the fourth metal block, the rear end face of the fifth metal block is located in the same plane as the rear end face of the fourth metal block, the front end face of the fifth metal block is located on the rear side of the front end face of the second cavity and on the front side of the plane where the front end face of the fourth metal block is located, the input cavity is located below the fifth metal block, the upper end face of the input cavity is located in the same plane as the lower end face of the second cavity, the lower end face of the input cavity is located in the same plane as the lower end face of the fourth metal plate, and the front end face of the input cavity is located in the The rear side of the front end face and the front side of the plane where the front end face of the fifth metal block is located, the right end face of the input cavity is located on the left side of the right end face of the second cavity and on the right side of the plane where the right end face of the fifth metal block is located, the left end face of the input cavity is located on the left side of the plane where the left end face of the fifth metal block is located and on the right side of the first symmetry plane, the rear end face of the input cavity is located on the front side of the plane where the front end face of the fourth metal block is located and on the rear side of the plane where the front end face of the fifth metal block is located, the lower end face of the input cavity is the input port of the radiation unit; the sixth metal block is located in the first cavity, and the upper end face of the sixth metal block is located below the upper end face of the first cavity. , the lower end face of the sixth metal block and the lower end face of the first cavity are located in the same plane, the width of the sixth metal block is equal to the width of the first metal block, the left end face of the sixth metal block and the left end face of the first cavity are located in the same plane, the right end face of the sixth metal block is located on the right side of the plane where the left end face of the second cavity is located and on the left side of the first symmetry plane, the sixth metal block is symmetrical front to back about the second symmetry plane, the seventh metal block is located in the first cavity, the seventh metal block is located on the right side of the sixth metal block, the upper end face of the seventh metal block is located below the upper end face of the first cavity, and the lower end face of the seventh metal block is located on the left side of the first symmetry plane. The lower end face of the first cavity is located in the same plane, the left end face of the seventh metal block is connected to the right end face of the sixth metal block, and are in a fitted state, the right end face of the seventh metal block is located to the right of the left end face of the second cavity and to the left of the first symmetry plane, the width of the seventh metal block is equal to the front end face of the sixth metal block and is located in the same plane, the seventh metal block is symmetrical front to back about the second symmetry plane, the eighth metal block is located in the second cavity, the upper end face of the eighth metal block is flush with the upper end face of the second cavity, the upper end face of the eighth metal block is respectively connected to the lower end face of the sixth metal block and the lower end face of the seventh metal block, and are in a fitted state,The front end face of the eighth metal block is located in the same plane as the front end face of the sixth metal block, the rear end face of the eighth metal block is located in the same plane as the rear end face of the sixth metal block, the lower end face of the eighth metal block is located in the same plane as the lower end face of the second cavity, the left end face of the eighth metal block is located in the same plane as the left end face of the second cavity, and the right end face of the eighth metal block is located to the left of the plane where the right end face of the second cavity is located and to the left of the first symmetry plane; the input ports of the forty radiating units, a total of forty input ports, are the forty input ports of the radiating network, which are connected one-to-one with the forty output ports of the third waveguide feeding network and are used to receive signals transmitted by the third waveguide feeding network.

[0012] Compared with the existing technology, the advantage of the present invention is that a broadband, low-profile cosecant square phased array antenna is constructed through a feeding network and a radiating network. The feeding network converts the input excitation signal into an electromagnetic wave with the required amplitude distribution and phase distribution and transmits it to the radiating network. The radiating network radiates the electromagnetic wave transmitted to it by the feeding network into free space. The feeding network is a hybrid feeding network based on a waveguide structure and a coaxial structure. The hybrid feeding network can realize a compact all-metal parallel feeding network topology with broadband stable output amplitude and phase. Therefore, the present invention has a wide bandwidth, high efficiency, low loss and low profile. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A perspective view of a broadband, low-profile, cosecant-squared phased array antenna according to the present invention;

[0014] Figure 2 A front view of the left half of the structure of the first waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0015] Figure 3 A front view of the right half of the structure of the first waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0016] Figure 4 A perspective view of the left half of the structure of the first waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0017] Figure 5 A perspective view of the right half of the structure of the first waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0018] Figure 6 A front view of the left half of the structure of the second waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0019] Figure 7 A front view of the right half of the structure of the second waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0020] Figure 8 A perspective view of the left half of the structure of the second waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0021] Figure 9 A perspective view of the right half of the structure of the second waveguide feeding network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0022] Figure 10 A front view of the left portion of the third waveguide feed network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0023] Figure 11 A front view of a middle portion of a third waveguide feed network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0024] Figure 12 A front view of the right portion of the third waveguide feed network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0025] Figure 13 A perspective view of the left half of the third waveguide feed network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0026] Figure 14 A perspective view of the right half of the third waveguide feed network of the broadband low-profile cosecant square phased array antenna of the present invention;

[0027] Figure 15 The three-dimensional structure of the radiating element of the broadband low-profile cosecant square phased array antenna of the present invention Figure 1 ;

[0028] Figure 16 The three-dimensional structure of the radiating element of the broadband low-profile cosecant square phased array antenna of the present invention Figure 2 ;

[0029] Figure 17 A top view of a radiating element of the broadband low-profile cosecant square phased array antenna of the present invention;

[0030] Figure 18 A reflection coefficient diagram of the simulation results of the broadband low-profile cosecant square phased array antenna of the present invention;

[0031] Figure 19 This is the radiation pattern of the radiation unit of the broadband low-profile cosecant square phased array antenna of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0033] Embodiment 1: A broadband, low-profile cosecant square phased array antenna includes a feeding network and a radiating network. The feeding network is used to convert the input excitation signal into an electromagnetic wave with the required amplitude distribution and phase distribution and then transmit it to the radiating network. The radiating network is used to radiate the electromagnetic wave transmitted to it by the feeding network into free space. The feeding network is a hybrid feeding network based on a waveguide structure and a coaxial structure.

[0034] In this embodiment, the feeding network converts the input excitation signal into an electromagnetic wave with the required amplitude distribution and phase distribution and transmits it to the radiating network. The radiating network radiates the electromagnetic wave transmitted to it by the feeding network into free space. The feeding network is a hybrid feeding network based on waveguide structure and coaxial structure. The hybrid feeding network can realize a compact all-metal parallel feeding network topology with broadband stable output amplitude and phase, thereby achieving wide bandwidth, high efficiency, low loss and low profile.

[0035] Example 2: This example is basically the same as Example 1, except that: Figure 1 As shown, the feeding network includes a first waveguide feeding network 1, a second waveguide feeding network 2 and a third waveguide feeding network 3. The first waveguide feeding network 1 is used to access the excitation signal input from the outside, and perform beam coupling and phase shift shaping on the excitation signal before transmitting it to the second waveguide feeding network 2. The second waveguide feeding network 2 is used to further perform beam coupling and phase shift shaping on the excitation signal transmitted thereto and then transmit it to the third waveguide feeding network 3. The third waveguide feeding network 3 is used to transmit the excitation signal transmitted thereto to the radiation network.

[0036] In this embodiment, the feeding network is composed of a first waveguide feeding network 1, a second waveguide feeding network 2 and a third waveguide feeding network 3, which can be folded twice. The cross-section is only 1 / 3 of the traditional vertical parallel feeding network, with a compact structure and stable output.

[0037] Example 3: This example is basically the same as Example 2, except that: in this example, Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown, the first waveguide feeding network 1 includes a first metal plate 4, three couplers, three phase shifters, three absorbers, three short-circuit blocks and eight double-ridged waveguide adapters. The first metal plate 4 is a rectangular parallelepiped structure. The length direction of the first metal plate 4 is used as the left-right direction, the width direction is used as the front-back direction, and the height direction is used as the up-down direction. The three couplers, three phase shifters, three absorbers, three short-circuit blocks and eight double-ridged waveguide adapters of the first waveguide feeding network 1 are respectively arranged on the first metal plate 4; the three couplers in the first waveguide feeding network 1 have four ports, and the four ports are respectively referred to as the first port, the second port, the third port and the fourth port. The three couplers in the first waveguide feeding network 1 are respectively referred to as the first coupler 5 , the second coupler 6 and the third coupler 7, the three phase shifters in the first waveguide feeding network 1 each have two ports, the two ports are referred to as the first port and the second port respectively, the three phase shifters in the first waveguide feeding network 1 are referred to as the first phase shifter 8, the second phase shifter 9 and the third phase shifter 10 respectively, the three absorbing devices in the first waveguide feeding network each have two ports, the two ports are referred to as the first port and the second port respectively, the three absorbing devices in the first waveguide feeding network 1 are referred to as the first absorbing device 11, the second absorbing device 12 and the third absorbing device 13 respectively, the three short-circuit blocks in the first waveguide feeding network 1 are referred to as the first short-circuit block 14, the second short-circuit block 15 and the third short-circuit block 16 respectively, the first wave The eight double-ridged waveguide adapters in the first waveguide feeding network 1 all have an input port and an output port. The eight double-ridged waveguide adapters in the first waveguide feeding network 1 are respectively referred to as a first double-ridged waveguide adapter 17, a second double-ridged waveguide adapter 18, a third double-ridged waveguide adapter 19, a fourth double-ridged waveguide adapter 20, a fifth double-ridged waveguide adapter 21, a sixth double-ridged waveguide adapter 22, a seventh double-ridged waveguide adapter 23, and an eighth double-ridged waveguide adapter 24. The input port of the first double-ridged waveguide adapter 17 is connected to the first port of the first phase shifter 8, the second port of the first phase shifter 8 is connected to the fourth port of the first coupler 5, and the third port of the first coupler 5 is connected to the first port of the first absorber 11. The first absorber 11 is used to absorb the first absorber 11. The energy of the third port of the first coupler 5 is connected. The second port of the first absorbing device 11 is connected to the first short-circuit block 14. The first short-circuit block 14 is used to isolate the energy of the second port of the first absorbing device 11. The output port of the third double-ridged waveguide adapter 19 is connected to the second port of the first coupler 5. The input port of the second double-ridged waveguide adapter 18 is connected to the first port of the first coupler 5. The output port of the fourth double-ridged waveguide adapter 20 is connected to the input port of the third double-ridged waveguide adapter 19. The fourth port of the second coupler 6 is connected to the input port of the fourth double-ridged waveguide adapter 20. The first port of the second absorbing device 12 is connected to the second port of the second coupler 6. The second absorbing device 12 is used to absorb the energy of the second port of the second coupler 6.The second port of the second absorbing device 12 is connected to the second short-circuit block 15, which is used to isolate the energy of the second port of the second absorbing device 12. The second port of the second phase shifter 9 is connected to the first port of the second coupler 6. The first port of the second phase shifter 9 is connected to the input port of the fifth double-ridged waveguide adapter 21. The output port of the fifth double-ridged waveguide adapter 21 is connected to the input port of the sixth double-ridged waveguide adapter 22. The output port of the sixth double-ridged waveguide adapter 22 is connected to the first port of the third coupler 7. The input port of the seventh double-ridged waveguide adapter 23 is connected to the second port of the third coupler 7. The first port of the third phase shifter 10 is connected to the third port of the third coupler 7. The fourth port of the third coupler 7 is connected to the second port of the third absorbing device 13. The third absorbing device 13 is used The first port of the third absorber 13 is connected to the third short-circuit block 16 to absorb energy from the fourth port of the third coupler 7. The third short-circuit block 16 is used to isolate energy from the first port of the third absorber 13. The input port of the eighth double-ridged waveguide adapter 24 is connected to the second port of the third phase shifter 10. The output port of the first double-ridged waveguide adapter 17 is the first output port of the first waveguide feeding network 1. The output port of the second double-ridged waveguide adapter 18 is the second output port of the first waveguide feeding network 1. The output port of the seventh double-ridged waveguide adapter 23 is the third output port of the first waveguide feeding network 1. The output port of the eighth double-ridged waveguide adapter 24 is the fourth output port of the first waveguide feeding network 1. The four output ports of the first waveguide feeding network 1 are used to transmit signals to the second waveguide feeding network 2.

[0038] In this embodiment, when the external excitation signal is output to the third port of the second coupler 6, the second coupler 6 divides the excitation signal received at its third port into three parts, wherein the first part is directly transmitted to the input port of the fourth double-ridged waveguide adapter 20 through the fourth port of the second coupler 6, the fourth double-ridged waveguide adapter 20 directly transmits the excitation signal received at its input port to the input port of the third double-ridged waveguide adapter 19 through its output port, and the third double-ridged waveguide adapter 19 directly transmits the excitation signal received at its input port to the output port of the first coupler 5 through its output port. At the second port, the first coupler 5 first couples the excitation signal received at its second port, and then transmits the coupled excitation signal to the second port of the first phase shifter 8 through its fourth port. The first phase shifter 8 outputs the excitation signal received at its second port to the second port of the first phase shifter 8. The first phase shifter 8 first shifts the phase of the excitation signal received at its second port, and then transmits the phase-shifted excitation signal to the input port of the first double-ridged waveguide adapter 17 through its first port. The first double-ridged waveguide adapter 17 outputs the excitation signal received at its input port through its output port. , that is, the first output port of the first waveguide feeding network 1 is transmitted to the second waveguide feeding network 2; the second part is directly input to the first port of the first coupler 5 through the second port of the second coupler 6, and the first coupler 5 directly inputs the excitation signal received by its first port to the input port of the second double-ridged waveguide adapter 18 through its second port, and the second double-ridged waveguide adapter 18 transmits the excitation signal received by its input port to the second waveguide feeding network 2 through its output port, that is, the second output port of the first waveguide feeding network 1; the third part is coupled by the second coupler 6 and then transmitted to the The excitation signal is transmitted to the second port of the second phase shifter 9 through the first port of the second coupler 6. The second phase shifter 9 first shifts the phase of the excitation signal received at its second port, and then inputs the phase-shifted excitation signal to the input port of the fifth double-ridged waveguide adapter 21 through its first port. The fifth double-ridged waveguide adapter 21 transmits the excitation signal received at its input port directly to the input port of the sixth double-ridged waveguide adapter 22 through its output port. The sixth double-ridged waveguide adapter 22 outputs the excitation signal received at its input port directly to the first port of the third coupler 7 through its output port.The third coupler 7 splits the excitation signal received at its first port into two parts. The first part is directly input to the first port of the third coupler 7 through the first port of the third coupler 7. The third coupler 7 first couples the excitation signal received at its first port and then inputs the coupled excitation signal to the first port of the third phase shifter 10 through its fourth port. The third phase shifter 10 first phase-shifts the excitation signal received at its first port and then transmits the phase-shifted excitation signal to the input port of the eighth double-ridged waveguide adapter 24 through its second port. The eighth double-ridged waveguide adapter 24 transmits the excitation signal received at its input port to the second waveguide feed network 2 through its output port, i.e., the fourth output port of the first waveguide feed network 1. The second part is directly input to the input port of the seventh double-ridged waveguide adapter 23 through the second port of the third coupler 7. The seventh double-ridged waveguide adapter 23 transmits the excitation signal received at its input port to the second waveguide feed network 2 through its output port, i.e., the third output port of the first waveguide feed network 1.

[0039] Example 4: This example is basically the same as Example 3, except that: in this example, Figure 6 、 Figure 7 、 Figure 8 、 Figure 9As shown, the second waveguide feeding network 2 includes a second metal plate 25, four short-circuit blocks, four absorbing devices, four couplers, four phase shifters and fourteen double-ridge waveguide adapters. The second metal plate 25 is a rectangular parallelepiped structure, and its length direction is along the left-right direction, the width direction is along the front-back direction, and the height direction is along the up-down direction. The second metal plate 25 is located on the rear side of the first metal plate 4, the front end face of the second metal plate 25 is in contact with the rear end face of the first metal plate 4, the left end face of the second metal plate 25 is in the same plane as the left end face of the first metal plate 4, the right end face of the second metal plate 25 is in the same plane as the right end face of the first metal plate 4, and the upper end face of the second metal plate 25 is in contact with the left end face of the first metal plate 4. The upper end surface of the first metal plate 4 is located in the same plane, and the lower end surface of the second metal plate 25 is located in the same plane as the lower end surface of the first metal plate 4; the four couplers in the second waveguide feeding network 2 each have four ports, and the four ports are respectively referred to as the first port, the second port, the third port and the fourth port; the four couplers in the second waveguide feeding network 2 are respectively referred to as the fourth coupler 26, the fifth coupler 27, the sixth coupler 28 and the seventh coupler 29; the four phase shifters in the second waveguide feeding network 2 each have two ports, and the two ports are respectively referred to as the first port and the second port; the four phase shifters in the second waveguide feeding network 2 are respectively referred to as the fourth coupler 26, the fifth coupler 27, the sixth coupler 28 and the seventh coupler 29. The four absorbing devices in the second waveguide feeding network 2 are respectively referred to as the fourth absorbing device 34, the fifth absorbing device 35, the sixth absorbing device 36 and the seventh absorbing device 37. The four short-circuit blocks in the second waveguide feeding network 2 are respectively referred to as the fourth short-circuit block 38, the fifth short-circuit block 39, the sixth short-circuit block 40 and the seventh short-circuit block 41. The fourteen double-ridge waveguide adapters in the second waveguide feeding network 2 each have a an input port and an output port; the fourteen double-ridged waveguide adapters in the second waveguide feeding network 2 are respectively referred to as a ninth double-ridged waveguide adapter 42, a tenth double-ridged waveguide adapter 43, an eleventh double-ridged waveguide adapter 44, a twelfth double-ridged waveguide adapter 45, a thirteenth double-ridged waveguide adapter 46, a fourteenth double-ridged waveguide adapter 47, a fifteenth double-ridged waveguide adapter 48, a sixteenth double-ridged waveguide adapter 49, a seventeenth double-ridged waveguide adapter 50, an eighteenth double-ridged waveguide adapter 51, a nineteenth double-ridged waveguide adapter 52, a twentieth double-ridged waveguide adapter 53, a twenty-first ridged waveguide adapter 54 and a twenty-second double-ridged waveguide adapter 55;The fourth short-circuit block 38 is connected to the first port of the fourth absorber 34 to isolate the energy of the first port of the fourth absorber 34. The second port of the fourth absorber 34 is connected to the first port of the fourth coupler 26 to absorb the energy of the first port of the fourth coupler 26. The output port of the ninth double-ridged waveguide adapter 42 is connected to the fourth port of the fourth coupler 26. The input port of the tenth double-ridged waveguide adapter 43 and the input port of the twelfth double-ridged waveguide adapter 45 are both connected to the third port of the fourth coupler 26. The first port of the fourth phase shifter 30 is connected to the second port of the fourth coupler 26. The first port of the fifth phase shifter 31 is connected to the second port of the fifth coupler 27, the second port of the fifth absorber 35 is connected to the second port of the fifth coupler 27, the second port of the fifth absorber 35 is connected to the first port of the fifth coupler 27, and the second port of the fifth absorber 35 is connected to the first port of the fifth coupler 27. The first port of the sixth wave absorbing device 36 is connected to the second port of the sixth coupler 28, and is used to absorb the energy of the second port of the sixth wave absorbing device 36. The second port of the sixth phase shifter 32 is connected to the first port of the sixth coupler 28, and the first port of the sixth wave absorbing device 36 is connected to the second port of the sixth coupler 28, and is used to absorb the energy of the second port of the sixth coupler 28. The input port of the nineteenth double-ridged waveguide adapter 52 is connected to the third port of the sixth coupler 28, and the input port of the seventeenth double-ridged waveguide adapter 50 is connected to the sixth coupler. The fourth port of the coupler 28 is connected, the input port of the sixteenth double-ridged waveguide adapter 49 is connected to the first port of the sixth phase shifter 32, the input port of the eighteenth double-ridged waveguide adapter 51 is connected to the first port of the seventh phase shifter 33, the second port of the seventh phase shifter 33 is connected to the first port of the seventh coupler 29, the first port of the seventh absorber 37 is connected to the second port of the seventh coupler 29, and is used to absorb energy at the second port of the seventh coupler 29, and the seventh short-circuit block 41 is connected to the second port of the seventh absorber 37, and is used to isolate energy from the second port of the seventh absorber 37;The input port of the twenty-first double-ridged waveguide adapter 54 is connected to the third port of the seventh coupler 29. The input port of the twentieth double-ridged waveguide adapter 53 and the input port of the twenty-second double-ridged waveguide adapter 55 are connected to the fourth port of the seventh coupler 29. The input port of the ninth double-ridged waveguide adapter 42 is the first input port of the second waveguide feeding network 2 and is connected to the first output port of the first waveguide feeding network 1. The input port of the eleventh double-ridged waveguide adapter 44 is the second input port of the second waveguide feeding network 2. , connected to the second output port of the first waveguide feeding network 1, the input port of the nineteenth double-ridge waveguide adapter 52 is the third input port of the second waveguide feeding network 2, connected to the third output port of the first waveguide feeding network 1, the input port of the twenty-first double-ridge waveguide adapter 54 is the fourth input port of the second waveguide feeding network 2, connected to the fourth output port of the first waveguide feeding network 1; the output port of the tenth double-ridge waveguide adapter 43 is the first output port of the second waveguide feeding network 2, the output port of the twelfth double-ridge waveguide adapter 54 is the fourth input port of the second waveguide feeding network 2, connected to the fourth output port of the first waveguide feeding network 1; The output port of the head 45 is the second output port of the second waveguide feeding network 2, the output port of the thirteenth double-ridge waveguide adapter 46 is the third output port of the second waveguide feeding network 2, the output port of the fourteenth double-ridge waveguide adapter 47 is the fourth output port of the second waveguide feeding network 2, the output port of the fifteenth double-ridge waveguide adapter 48 is the fifth output port of the second waveguide feeding network 2, the output port of the sixteenth double-ridge waveguide adapter 49 is the sixth output port of the second waveguide feeding network 2, and the output port of the seventeenth double-ridge waveguide adapter 47 is the sixth output port of the second waveguide feeding network 2. The output port of the header 50 is the seventh output port of the second waveguide feed network 2. The output port of the eighteenth double-ridged waveguide adapter 51 is the eighth output port of the second waveguide feed network 2. The output port of the twentieth double-ridged waveguide adapter 53 is the ninth output port of the second waveguide feed network 2. The output port of the twenty-second double-ridged waveguide adapter 55 is the tenth output port of the second waveguide feed network 2. The first to tenth output ports of the second waveguide feed network 2 are used to transmit signals to the third waveguide feed network 3.

[0040] In this embodiment, when the excitation signal output from the first output port of the first waveguide feeding network 1 is transmitted to the first input port of the second waveguide feeding network 2, the excitation signal enters the ninth double-ridged waveguide adapter 42 through the input port of the ninth double-ridged waveguide adapter 42. The ninth double-ridged waveguide adapter 42 transmits the excitation signal through its output port to the fourth port of the fourth coupler 26. The fourth coupler 26 divides the excitation signal received at its fourth port into two parts, and first couples the first part of the excitation signal. Then, the coupled excitation signal is transmitted to the first port of the fourth phase shifter 30 through its second port. The second part of the excitation signal is directly transmitted to the third port of the fourth coupler 26. The excitation signal transmitted to the third port of the fourth coupler 26 is also divided into two parts. The first part of the excitation signal is transmitted to the tenth double-ridged waveguide adapter 43 through the third port of the fourth coupler 26. The first part of the excitation signal is transmitted to the input port of the twelfth double-ridged waveguide adapter 45 through its third port. The tenth double-ridged waveguide adapter 43 transmits the first part of the excitation signal received at its input port to the third waveguide feeding network 3 through its output port, that is, the first output port of the second waveguide feeding network 2. The twelfth double-ridged waveguide adapter 45 transmits the excitation signal received at its input port to the third waveguide feeding network 3 through its output port, that is, the second output port of the second waveguide feeding network 2. The fourth phase shifter 30 first shifts the phase of the excitation signal received at its first port, and then transmits the phase-shifted excitation signal to the input port of the thirteenth double-ridged waveguide adapter 46 through its second port. The thirteenth double-ridged waveguide adapter 46 transmits the excitation signal received at its input port to the third waveguide feeding network 3 through its output port, that is, the third output port of the second waveguide feeding network 2.When the signal output from the second output end of the first waveguide feeding network 1 is input to the second input port of the second waveguide feeding network 2, i.e., the input port of the eleventh double-ridged waveguide adapter 44, the eleventh double-ridged waveguide adapter 44 transmits the received excitation signal through its output port to the fourth port of the fifth coupler 27. The fifth coupler 27 divides the excitation signal received at its fourth port into two parts, and transmits the first part of the excitation signal directly through its third port to the input port of the fourteenth double-ridged waveguide adapter 47. The fourteenth double-ridged waveguide adapter 47 transmits the excitation signal received at its input port through its output port. , that is, the fourth output port of the second waveguide feeding network 2 is transmitted to the third waveguide feeding network 3, the second part of the excitation signal is first coupled, and then the coupled excitation signal is transmitted to the first port of the fifth phase shifter 31 through its second port, the fifth phase shifter 31 first shifts the phase of the excitation signal received at its first port, and then directly transmits the phase-shifted excitation signal to the input port of the fifteenth double-ridged waveguide adapter 48 through its second port, the fifteenth double-ridged waveguide adapter 48 transmits the excitation signal received at its input port through its output port, that is, the fifth output port of the second waveguide feeding network 2, to the third waveguide feeding network When the signal output from the third output port of the first waveguide feeding network 1 is input to the third input port of the second waveguide feeding network 2, i.e., the input port of the nineteenth double-ridged waveguide adapter 52, the nineteenth double-ridged waveguide adapter 52 inputs the excitation signal it receives to the third port of the sixth coupler 28 through its output port. The sixth coupler 28 divides the signal received from its third port into two parts, and transmits the first part of the excitation signal directly to the input port of the seventeenth double-ridged waveguide adapter 50 through its fourth port. The seventeenth double-ridged waveguide adapter 50 transmits the excitation signal received from its input port to the third port of the sixth coupler 28 through its output port. The seventh output port of the second waveguide feeding network 2 is transmitted to the third waveguide feeding network 3, the second part of the excitation signal is first coupled, and then the coupled excitation signal is transmitted to the second port of the sixth phase shifter 32 through its first port. The sixth phase shifter 32 first shifts the phase of the excitation signal received at its second port, and then transmits the phase-shifted excitation signal to the input port of the sixteenth double-ridged waveguide adapter 49 through its first port. The sixteenth double-ridged waveguide adapter 49 transmits the excitation signal received at its input port to the third feeding network through its output port, that is, the sixth output port of the second waveguide feeding network 2;When the signal output from the fourth output port of the first waveguide feeding network 1 is input to the fourth input port of the second waveguide feeding network 2, i.e., the input port of the twenty-first double-ridged waveguide adapter, the twenty-first double-ridged waveguide adapter transmits the excitation signal it receives to the third port of the seventh coupler 29 through its output port. The seventh coupler 29 divides the excitation signal received at its third port into two parts, and transmits the first part of the excitation signal to the input port of the twenty-second double-ridged waveguide adapter 55 and the input port of the twentieth double-ridged waveguide adapter 53 through its fourth port. The twenty-second double-ridged waveguide adapter 55 transmits the excitation signal received at its input port and the excitation signal received at its input port to the twenty-second double-ridged waveguide adapter 53 through its output port, i.e., the tenth output port of the second waveguide feeding network 2. The twentieth double-ridged waveguide adapter 53 transmits the excitation signal received at its input port to the third waveguide feed network 3 through its output port, i.e., the ninth output port of the second waveguide feed network 2. It first couples the second portion of the excitation signal and then transmits the coupled excitation signal to the second port of the seventh phase shifter 33 through its first port. The seventh phase shifter 33 first phase-shifts the excitation signal received at its second port and then transmits the phase-shifted excitation signal to the input port of the eighteenth double-ridged waveguide adapter 51 through its first port. The eighteenth double-ridged waveguide adapter 51 transmits the excitation signal received at its input port to the third waveguide feed network 3 through its output port, i.e., the eighth output port of the second waveguide feed network 2.

[0041] Example 5: This example is basically the same as Example 4, except that: in this example, Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14As shown, the third waveguide feeding network 3 includes a third metal plate 56, two one-to-nine power splitters, six one-to-three power splitters, two one-to-two power splitters and ten double-ridge waveguide adapters. The third metal plate 56 is a rectangular parallelepiped structure, and its length direction is along the left-right direction, the width direction is along the front-to-back direction, and the height direction is along the up-down direction. The third metal plate 56 is located on the rear side of the second metal plate 25, and the front end surface of the third metal plate 56 is fixed to the rear end surface of the second metal plate 25 and is in a bonded state. The left end surface of the third metal plate 56 is located at the left end surface of the second metal plate 25. The right end surface of the third metal plate 56 and the right end surface of the second metal plate 25 are located in the same plane, the upper end surface of the third metal plate 56 and the upper end surface of the second metal plate 25 are located in the same plane, and the lower end surface of the third metal plate 56 and the lower end surface of the second metal plate 25 are located in the same plane; two one-to-nine power splitters, six one-to-three power splitters, two one-to-two power splitters, and ten double-ridge waveguide adapters are all arranged on the third metal plate 56. Each of the two one-to-nine power splitters has one input port and nine output ports. The two one-to-nine power splitters are respectively referred to as The first one-to-nine power splitter 57 and the second one-to-nine power splitter 58, the two one-to-two power splitters each have one input port and two output ports, the two one-to-two power splitters are respectively referred to as the first one-to-two power splitter 59 and the second one-to-two power splitter 60, the six one-to-three power splitters each have one input port and three output ports, the six one-to-three power splitters are respectively referred to as the first one-to-three power splitter 61, the second one-to-three power splitter 62, the third one-to-three power splitter 63, the fourth one-to-three power splitter 64, the fifth one-to-three power splitter 65 and the sixth one-to-three power splitter 66. 6. Each of the ten double-ridged waveguide adapters has an input port and an output port. The ten double-ridged waveguide adapters are referred to as a twenty-third double-ridged waveguide adapter 67, a twenty-fourth double-ridged waveguide adapter 68, a twenty-fifth double-ridged waveguide adapter 69, a twenty-sixth double-ridged waveguide adapter 70, a twenty-seventh double-ridged waveguide adapter 71, a twenty-eighth double-ridged waveguide adapter 72, a twenty-ninth double-ridged waveguide adapter 73, a thirtieth double-ridged waveguide adapter 74, a thirty-first double-ridged waveguide adapter 75, and a thirty-second double-ridged waveguide adapter 76.The output port of the twenty-third double-ridged waveguide adapter 67 is connected to the input port of the first one-to-nine power splitter 57, the output port of the twenty-fourth double-ridged waveguide adapter 68 is connected to the input port of the first one-to-three power splitter 61, the output port of the twenty-fifth double-ridged waveguide adapter 69 is connected to the input port of the second one-to-three power splitter 62, the output port of the twenty-sixth double-ridged waveguide adapter 70 is connected to the input port of the third one-to-three power splitter 63, and the output port of the twenty-seventh double-ridged waveguide adapter 71 is connected to the input port of the first one-to-two power splitter 59. The output port of the thirty-second double-ridged waveguide adapter 76 is connected to the input port of the second one-to-nine power splitter 58, the output port of the thirty-first double-ridged waveguide adapter 75 is connected to the input port of the sixth one-to-three power splitter 66, the output port of the thirtieth double-ridged waveguide adapter 74 is connected to the input port of the fifth one-to-three power splitter 65, the output port of the thirty-first double-ridged waveguide adapter 75 is connected to the input port of the fourth one-to-three power splitter 64, and the output port of the thirty-second double-ridged waveguide adapter 76 is connected to the input port of the second one-to-two power splitter 60;The input port of the twenty-third double-ridge waveguide adapter 67 is the first input port of the third waveguide feeding network 3, the input port of the twenty-fourth double-ridge waveguide adapter 68 is the second input port of the third waveguide feeding network 3, the input port of the twenty-fifth double-ridge waveguide adapter 69 is the third input port of the third waveguide feeding network 3, the input port of the twenty-sixth double-ridge waveguide adapter 70 is the fourth input port of the third waveguide feeding network 3, the input port of the twenty-seventh double-ridge waveguide adapter 71 is the fifth input port of the third waveguide feeding network 3, the input port of the twenty-eighth double-ridge waveguide adapter 72 is the sixth input port of the third waveguide feeding network 3, and the input port of the twenty-ninth double-ridge waveguide adapter 73 is The seventh input port of the third waveguide feeding network 3, the input port of the 30th double-ridged waveguide adapter 74 is the eighth input port of the third waveguide feeding network 3, the input port of the 31st double-ridged waveguide adapter 75 is the ninth input port of the third waveguide feeding network 3, the input port of the 32nd double-ridged waveguide adapter 76 is the tenth input port of the third waveguide feeding network 3, the first input port of the third waveguide feeding network 3 is connected to the first output port of the second waveguide feeding network 2, the second input port of the third waveguide feeding network 3 is connected to the second output port of the second waveguide feeding network 2, the third input port of the third waveguide feeding network 3 is connected to the third output port of the second waveguide feeding network 2, and the third waveguide The fourth input port of the third waveguide feeding network 3 is connected to the fourth output port of the second waveguide feeding network 2, the fifth input port of the third waveguide feeding network 3 is connected to the fifth output port of the second waveguide feeding network 2, the sixth input port of the third waveguide feeding network 3 is connected to the sixth output port of the second waveguide feeding network 2, the seventh input port of the third waveguide feeding network 3 is connected to the seventh output port of the second waveguide feeding network 2, the eighth input port of the third waveguide feeding network 3 is connected to the eighth output port of the second waveguide feeding network 2, the ninth input port of the third waveguide feeding network 3 is connected to the ninth output port of the second waveguide feeding network 2, and the tenth input port of the third waveguide feeding network 3 is connected to the second waveguide feeding network 2. The tenth output port of network 2 is connected to the nine output ports of the first one-to-nine power splitter 57, the three output ports of the first one-to-three power splitter 61, the three output ports of the second one-to-three power splitter 62, the three output ports of the third one-to-three power splitter 63, the two output ports of the first one-to-two power splitter 59, the two output ports of the second one-to-two power splitter 60, the three output ports of the fourth one-to-three power splitter 64, the three output ports of the fifth one-to-three power splitter 65, the three output ports of the sixth one-to-three power splitter 66, and the nine output ports of the second one-to-nine power splitter 58, for a total of forty output ports, serving as the forty output ports of the third waveguide feeding network 3, for outputting signals to the radiating network.

[0042] In this embodiment, when the first output port to the tenth output port of the second waveguide feeding network 2 transmit the excitation signal to the first input port to the tenth input port of the third waveguide feeding network 3 in a one-to-one correspondence, the input port of the twenty-third double-ridged waveguide adapter 67 transmits the excitation signal it receives to the input port of the first one-to-nine power splitter 57 through its output port, the twenty-fourth double-ridged waveguide adapter 68 transmits the excitation signal it receives to the input port of the first one-to-three power splitter 61 through its output port, the twenty-fifth double-ridged waveguide adapter 69 transmits the excitation signal it receives to the input port of the second one-to-three power splitter 62 through its output port, the twenty-sixth double-ridged waveguide adapter 70 transmits the excitation signal it receives to the input port of the third one-to-three power splitter 63 through its output port, and the twenty-seventh double-ridged waveguide adapter 7 1 transmits the excitation signal it receives through its output port to the input port of the first one-to-two power splitter 59, the twenty-eighth double-ridged waveguide adapter 72 transmits the excitation signal it receives through its output port to the input port of the second one-to-two power splitter 60, the twenty-ninth double-ridged waveguide adapter 73 transmits the excitation signal it receives through its output port to the input port of the fourth one-to-three power splitter 64, the thirtieth double-ridged waveguide adapter 74 transmits the excitation signal it receives through its output port to the input port of the fifth one-to-three power splitter 65, the thirty-first double-ridged waveguide adapter 75 transmits the excitation signal it receives through its output port to the input port of the sixth one-to-three power splitter 66, and the thirty-second double-ridged waveguide adapter 76 transmits the excitation signal it receives through its output port to the input port of the second one-to-nine power splitter 58;The second one-to-nine power splitter 58 divides the signal received by its input port into nine paths, which are output to the radiation network through its nine output ports in a one-to-one correspondence. The first one-to-three power splitter 61 divides the signal received by its input port into three paths, which are output to the radiation network through its three output ports in a one-to-one correspondence. The second one-to-three power splitter 62 divides the signal received by its input port into three paths, which are output to the radiation network through its three output ports in a one-to-one correspondence. The third one-to-three power splitter 63 divides the signal received by its input port into three paths, which are output to the radiation network through its three output ports in a one-to-one correspondence. The first one-to-two power splitter 59 divides the signal received by its input port into two paths, which are output to the radiation network through its two output ports in a one-to-one correspondence. The second one-to-two power splitter 60 splits the signal received at its input port into two paths, which are output to the radiating network through its two output ports in a one-to-one correspondence. The fourth one-to-three power splitter 64 splits the signal received at its input port into three paths, which are output to the radiating network through its three output ports in a one-to-one correspondence. The fifth one-to-three power splitter 65 splits the signal received at its input port into three paths, which are output to the radiating network through its three output ports in a one-to-one correspondence. The sixth one-to-three power splitter 66 splits the signal received at its input port into three paths, which are output to the radiating network through its three output ports in a one-to-one correspondence. The second one-to-nine power splitter 58 splits the signal received at its input port into nine paths, which are output to the radiating network through its nine output ports in a one-to-one correspondence.

[0043] Example 6: This example is basically the same as Example 5, except that: in this example, Figure 15 、 Figure 16 、 Figure 17As shown, the radiation network includes a fourth metal plate 77 and forty radiation units 78 arranged on the fourth metal plate 77. The fourth metal plate 77 is a rectangular structure. The length direction of the fourth metal plate 77 is along the left-right direction, the width direction is along the front-back direction, and the height direction is along the up-down direction. The fourth metal plate 77 is located above the first metal plate 4, the second metal plate 25 and the third metal plate 56. The front end face of the fourth metal plate 77 is flush with the front end face of the first metal plate 4, the rear end face of the fourth metal plate 77 is flush with the rear end face of the first metal plate 4, the front end face of the fourth metal plate 77 is flush with the front end face of the first metal plate 4, the rear end face of the fourth metal plate 77 is flush with the rear end face of the third metal plate 56, the lower end face of the fourth metal plate 77 is fixedly connected to the upper end face of the first metal plate 4, the upper end face of the second metal plate 25 and the upper end face of the third metal plate 56, and is in a fitted state. The forty radiation units 78 are evenly spaced along a row from left to right. Distribution; Each radiation unit 78 includes a first cavity 79, a second cavity 80, a first metal block 81, a second metal block 82, a third metal block 83, a fourth metal block 84, a fifth metal block 85, a sixth metal block 86, a seventh metal block 87, an eighth metal block 88 and an input cavity 89. The first cavity 79, the second cavity 80, the first metal block 81, the second metal block 82, the third metal block 83, the fourth metal block 84, the fifth metal block 85, the sixth metal block 86, the seventh metal block 87, the eighth metal block 88 and the input cavity 89 are all rectangular parallelepiped structures. The length directions of the first cavity 79, the second cavity 80, the first metal block 81, the second metal block 82, the third metal block 83, the fourth metal block 84, the fifth metal block 85, the sixth metal block 86, the seventh metal block 87, the eighth metal block 88 and the input cavity 89 are all along the left-right direction, the width directions are all along the front-to-back direction, and the height directions are all along the up-down direction;The first cavity 79 and the second cavity 80 are respectively opened on the fourth metal plate 77. The first cavity 79 is located above the second cavity 80. The upper end surface of the first cavity 79 is flush with the upper end surface of the fourth metal plate 77. The lower end surface of the first cavity 79 is connected to the upper end surface of the second cavity 80 and is in a fitted state. The front end surface of the first cavity 79 is flush with the front end surface of the fourth metal plate 77, and the rear end surface of the first cavity 79 is flush with the rear end surface of the fourth metal plate 77. The lower end surface of the second cavity 80 is located at the lower end surface of the fourth metal plate 77. Above, the length of the second cavity 80 is smaller than the length of the first cavity 79, and the width of the second cavity 80 is smaller than the width of the first cavity 79. The plane that makes the first cavity 79 bilaterally symmetrical is called the first symmetry plane. The second cavity 80 is bilaterally symmetrical about the first symmetry plane. The plane that makes the first cavity 79 front-to-back symmetry is called the second symmetry plane. The second cavity 80 is front-to-back symmetry about the second symmetry plane. The first metal block 81 is located in the first cavity 79, and the upper end surface of the first metal block 81 is located at the upper end surface of the first cavity 79. Below, the lower end surface of the first metal block 81 and the lower end surface of the first cavity 79 are located in the same plane, the width of the first metal block 81 is smaller than the width of the second cavity 80, the right end surface of the first metal block 81 and the right end surface of the first cavity 79 are located in the same plane, the left end surface of the first metal block 81 is located on the left side of the plane where the right end surface of the second cavity 80 is located and on the right side of the first symmetry plane, the first metal block 81 is symmetrical about the second symmetry plane, the second metal block 82 is located in the first cavity 79, and the second metal block 82 is located at the position On the left side of the first metal block 81, the upper end surface of the second metal block 82 is located below the plane where the upper end surface of the first metal block 81 is located, the lower end surface of the second metal block 82 is located in the same plane as the lower end surface of the first metal block 81, the right end surface of the second metal block 82 is connected to the left end surface of the first metal block 81, and is in a bonded state. The width of the second metal block 82 is equal to the width of the first metal block 81. The second metal block 82 is symmetrical front-to-back about the second symmetry plane, and the right end surface of the second metal block 82 is located to the left of the first symmetry plane.The third metal block 83 is located in the second cavity 80, the upper end surface of the third metal block 83 is flush with the upper end surface of the second cavity 80, the upper end surface of the third metal block 83 is connected to the lower end surface of the first metal block 81 and the lower end surface of the second metal block 82, and is in a fitted state, the front end surface of the third metal block 83 is located in the same plane as the front end surface of the first metal block 81, the rear end surface of the third metal block 83 is located in the same plane as the rear end surface of the first metal block 81, the right end surface of the third metal block 83 is located in the same plane as the right end surface of the second cavity 80, the left end surface of the third metal block 83 is located on the left side of the plane where the left end surface of the second metal block 82 is located and on the right side of the first symmetry plane, and the fourth metal block 84 is located in the second cavity 80. 0, the fourth metal block 84 is located below the third metal block 83, the upper end surface of the fourth metal block 84 is connected to the lower end surface of the third metal block 83, and is in a fitted state, the right end surface of the fourth metal block 84 is located in the same plane as the right end surface of the second metal block 82, the left end surface of the fourth metal block 84 is located in the same plane as the left end surface of the third metal block 83, the rear end surface of the fourth metal block 84 is flush with the rear end surface of the third metal block 83, the front end surface of the fourth metal block 84 is flush with the front end surface of the third metal block 83, the lower end surface of the fourth metal block 84 is located above the lower end surface of the second cavity 80, the fifth metal block 85 is located in the second cavity 80, the fifth metal block 85 is located below the fourth metal block 84, the fifth metal block 85 is located below the fourth metal block 84, The upper end face of the block 85 is connected to the lower end face of the fourth metal block 84 and is in a fitted state. The lower end face of the fifth metal block 85 is located in the same plane as the lower end face of the second cavity 80. The right end face of the fifth metal block 85 is located in the same plane as the right end face of the fourth metal block 84. The left end face of the fifth metal block 85 is located in the same plane as the left end face of the fourth metal block 84. The rear end face of the fifth metal block 85 is located in the same plane as the rear end face of the fourth metal block 84. The front end face of the fifth metal block 85 is located on the rear side of the front end face of the second cavity 80 and on the front side of the plane where the front end face of the fourth metal block 84 is located. The input cavity 89 is located below the fifth metal block 85. The upper end face of the input cavity 89 is located on the lower end face of the second cavity 80. The lower end face of the input cavity 89 and the lower end face of the fourth metal plate 77 are located in the same plane. The front end face of the input cavity 89 is located on the rear side of the front end face of the second cavity 80 and in front of the plane where the front end face of the fifth metal block 85 is located. The right end face of the input cavity 89 is located on the left side of the right end face of the second cavity 80 and on the right side of the plane where the right end face of the fifth metal block 85 is located. The left end face of the input cavity 89 is located on the left side of the plane where the left end face of the fifth metal block 85 is located and on the right side of the first symmetry plane. The rear end face of the input cavity 89 is located in front of the plane where the front end face of the fourth metal block 84 is located and on the rear side of the plane where the front end face of the fifth metal block 85 is located. The lower end face of the input cavity 89 is the input port of the radiation unit 78.The sixth metal block 86 is located in the first cavity 79, the upper end surface of the sixth metal block 86 is located below the upper end surface of the first cavity 79, the lower end surface of the sixth metal block 86 and the lower end surface of the first cavity 79 are located in the same plane, the width of the sixth metal block 86 is equal to the width of the first metal block 81, the left end surface of the sixth metal block 86 and the left end surface of the first cavity 79 are located in the same plane, the right end surface of the sixth metal block 86 is located to the right of the plane where the left end surface of the second cavity 80 is located and to the left of the first symmetry plane, and the sixth metal block 86 is forward with respect to the second symmetry plane. The seventh metal block 87 is located in the first cavity 79 and is located on the right side of the sixth metal block 86. The upper end surface of the seventh metal block 87 is located below the upper end surface of the first cavity 79. The lower end surface of the seventh metal block 87 and the lower end surface of the first cavity 79 are located in the same plane. The left end surface of the seventh metal block 87 is connected to the right end surface of the sixth metal block 86 and is in a fitted state. The right end surface of the seventh metal block 87 is located to the right of the left end surface of the second cavity 80 and to the left of the first symmetry plane. The width of the seventh metal block 87 is equal to that of the sixth metal block 86. The front end faces of the block 86 are located in the same plane, the seventh metal block 87 is symmetrical about the second symmetry plane, the eighth metal block 88 is located in the second cavity 80, the upper end face of the eighth metal block 88 is flush with the upper end face of the second cavity 80, the upper end face of the eighth metal block 88 is connected to the lower end face of the sixth metal block 86 and the lower end face of the seventh metal block 87, and is in a fitted state, the front end face of the eighth metal block 88 and the front end face of the sixth metal block 86 are located in the same plane, and the rear end face of the eighth metal block 88 and the rear end face of the sixth metal block 86 are located in the same plane The lower end surface of the eighth metal block 88 is coplanar with the lower end surface of the second cavity 80. The left end surface of the eighth metal block 88 is coplanar with the left end surface of the second cavity 80. The right end surface of the eighth metal block 88 is to the left of the plane containing the right end surface of the second cavity 80 and to the left of the first symmetry plane. The input ports of the forty radiating elements 78, totaling forty input ports, constitute the forty input ports of the radiating network and are connected one-to-one with the forty output ports of the third waveguide feeding network 3 to receive signals transmitted by the third waveguide feeding network 3.

[0044] In this embodiment, when the forty output ports of the third waveguide feeding network 3 transmit signals to the input port of each radiating unit 78, in each radiating unit 78, the signal will freely radiate along the space formed between the left end face of the fourth metal block 84, the left end face of the fifth metal block 85, and the right end face of the eighth metal block 88 to the space formed between the left end face of the third metal block 83 and the right end face of the eighth metal block 88, and then freely radiate to the space formed between the left end face of the second metal block 82 and the right end face of the seventh metal block 87, and then freely radiate to the space formed between the left end face of the first metal block 81 and the right end face of the sixth metal block 86, and finally radiate to the free space. In the process of radiating the signal by each radiating unit 78, the first metal block 81, the second metal block 82, the third metal block 83, the fourth metal block 84, the fifth metal block 85, the sixth metal block 86, the seventh metal block 87, and the eighth metal block 88 fix the direction of the free radiation of the signal, so that the signal has maximum energy when radiated to the free space.

[0045] To verify the performance of the broadband low-profile cosecant square phased array antenna of the present invention, the broadband low-profile cosecant square phased array antenna of the present invention was simulated using ANSYS HFSS simulation software. The simulation results of the broadband low-profile cosecant square phased array antenna of the present invention are shown in the reflection coefficient diagram. Figure 18 As shown, the radiation pattern of the radiation unit of the broadband low-profile cosecant square phased array antenna of the present invention is as follows Figure 19 Analysis Figure 18 and Figure 19 It can be seen that the design bandwidth of the broadband low-profile cosecant square phased array antenna of the present invention is 6-7.5 GHz, and the actual -10 dB impedance bandwidth exceeds 29.6%, which is due to the structure of the wide radiation network and feeding network; the total port simulation reflection coefficient is controlled to be less than -16.8 dB within the bandwidth, indicating that the overall matching of the broadband low-profile cosecant square phased array antenna of the present invention is good; the realized cosecant square beams all meet the starting angle of 0° and the ending angle of 25°, and the amplitude fluctuation value of the shaping area within the 25° wide beam coverage range is less than 1.7 dB, and the side lobe level is less than 25 dB, so the envelope is stable and close to the target radiation pattern; in addition, it can be observed that the zero point on the left side of the shaping area is shifted to the left by about 4°. The envelope of the beam and Figure 19 It is maintained well, indicating that the amplitude of the feed network output is relatively stable; and the small amplitude offset of the zero point is mainly caused by a certain error between the phase value of the feed network output and the target value.

[0046] In summary, the broadband low-profile cosecant square phased array antenna of the present invention has wide bandwidth, high efficiency, low loss and low profile.

Claims

1. A broadband, low-profile cosecant square phased array antenna, characterized in that The invention comprises a feeding network and a radiating network, wherein the feeding network is used to convert the input excitation signal into an electromagnetic wave with the required amplitude distribution and phase distribution and then transmit it to the radiating network, and the radiating network is used to radiate the electromagnetic wave transmitted to it by the feeding network into free space, and the feeding network is a hybrid feeding network based on a waveguide structure and a coaxial structure; the feeding network comprises a first waveguide feeding network, a second waveguide feeding network and a third waveguide feeding network, the first waveguide feeding network is used to access the external input excitation signal, and perform beam coupling and phase shift shaping on the excitation signal and then transmit it to the second waveguide feeding network, the second waveguide feeding network is used to continue beam coupling and phase shift shaping on the excitation signal transmitted thereto and then transmit it to the third waveguide feeding network, and the third waveguide feeding network is used to transmit the electromagnetic wave transmitted thereto to the third waveguide feeding network. The waveguide feeding network is used to transmit the excitation signal transmitted thereto to the radiation network; the first waveguide feeding network includes a first metal plate, three couplers, three phase shifters, three absorbing devices, three short-circuit blocks and eight double-ridged waveguide adapters, the first metal plate is a rectangular parallelepiped structure, the length direction of the first metal plate is used as the left-right direction, the width direction is used as the front-back direction, and the height direction is used as the up-down direction. The three couplers, three phase shifters, three absorbing devices, three short-circuit blocks and eight double-ridged waveguide adapters of the first waveguide feeding network are respectively arranged on the first metal plate; the three couplers in the first waveguide feeding network each have four ports, and the four ports are respectively referred to as the first port, the second port, the third port and the fourth port thereof, and the first waveguide feeding network is used as the second port, the third port and the fourth port thereof. The three couplers are respectively referred to as the first coupler, the second coupler and the third coupler, the three phase shifters in the first waveguide feeding network each have two ports, the two ports are respectively referred to as the first port and the second port, the three phase shifters in the first waveguide feeding network are respectively referred to as the first phase shifter, the second phase shifter and the third phase shifter, the three absorbing devices in the first waveguide feeding network each have two ports, the two ports are respectively referred to as the first port and the second port, the three absorbing devices in the first waveguide feeding network are respectively referred to as the first absorbing device, the second absorbing device and the third absorbing device, the three short-circuit blocks in the first waveguide feeding network are respectively referred to as the first short-circuit block, the second short-circuit block and the third short-circuit block, the first waveguide feeding network The eight double-ridged waveguide adapters each have an input port and an output port. The eight double-ridged waveguide adapters in the first waveguide feeding network are respectively referred to as a first double-ridged waveguide adapter, a second double-ridged waveguide adapter, a third double-ridged waveguide adapter, a fourth double-ridged waveguide adapter, a fifth double-ridged waveguide adapter, a sixth double-ridged waveguide adapter, a seventh double-ridged waveguide adapter, and an eighth double-ridged waveguide adapter. The input port of the first double-ridged waveguide adapter is connected to the first port of the first phase shifter, the second port of the first phase shifter is connected to the fourth port of the first coupler, the third port of the first coupler is connected to the first port of the first absorbing device, the first absorbing device is used to absorb energy from the third port of the first coupler, and the second port of the first absorbing device is connected to the first short-circuit block.The first short-circuit block is used to isolate energy from the second port of the first absorbing device. The output port of the third double-ridged waveguide adapter is connected to the second port of the first coupler. The input port of the second double-ridged waveguide adapter is connected to the first port of the first coupler. The output port of the fourth double-ridged waveguide adapter is connected to the input port of the third double-ridged waveguide adapter. The fourth port of the second coupler is connected to the input port of the fourth double-ridged waveguide adapter. The first port of the second absorbing device is connected to the second port of the second coupler. The second absorbing device is used to absorb energy from the second port of the second coupler. The second port of the second absorbing device is connected to the second short-circuit block. The second short-circuit block is used to isolate energy from the second port of the second absorbing device. The second port of the second phase shifter is connected to the first port of the second coupler. The first port of the second phase shifter is connected to the input port of the fifth double-ridged waveguide adapter. The output port of the fifth double-ridged waveguide adapter is connected to the input port of the sixth double-ridged waveguide adapter. The output port of the sixth double-ridged waveguide adapter is connected to the third coupler. The first port of the double-ridged waveguide adapter is connected to the first port of the third coupler, the input port of the seventh double-ridged waveguide adapter is connected to the second port of the third coupler, the first port of the third phase shifter is connected to the third port of the third coupler, the fourth port of the third coupler is connected to the second port of the third absorber, the third absorber is used to absorb energy from the fourth port of the third coupler, the first port of the third absorber is connected to the third short-circuit block, the third short-circuit block is used to isolate energy from the first port of the third absorber, the input port of the eighth double-ridged waveguide adapter is connected to the second port of the third phase shifter, the output port of the first double-ridged waveguide adapter is the first output port of the first waveguide feeding network, the output port of the second double-ridged waveguide adapter is the second output port of the first waveguide feeding network, the output port of the seventh double-ridged waveguide adapter is the third output port of the first waveguide feeding network, and the output port of the eighth double-ridged waveguide adapter is the fourth output port of the first waveguide feeding network. The four output ports of the first waveguide feeding network are used to transmit signals to the second waveguide feeding network.

2. The broadband, low-profile cosecant square phased array antenna according to claim 1, characterized in that The second waveguide feeding network includes a second metal plate, four short-circuit blocks, four absorbing devices, four couplers, four phase shifters and fourteen double-ridge waveguide adapters. The second metal plate is a rectangular parallelepiped structure, and its length direction is along the left-right direction, the width direction is along the front-back direction, and the height direction is along the up-down direction. The second metal plate is located on the rear side of the first metal plate, the front end face of the second metal plate is in contact with the rear end face of the first metal plate, the left end face of the second metal plate is in the same plane as the left end face of the first metal plate, the right end face of the second metal plate is in the same plane as the right end face of the first metal plate, and the upper end of the second metal plate is in contact with the left end face of the first metal plate. The upper end surface of the second metal plate is in the same plane as the upper end surface of the first metal plate, and the lower end surface of the second metal plate is in the same plane as the lower end surface of the first metal plate; the four couplers in the second waveguide feeding network each have four ports, and the four ports are respectively referred to as the first port, the second port, the third port and the fourth port; the four couplers in the second waveguide feeding network are respectively referred to as the fourth coupler, the fifth coupler, the sixth coupler and the seventh coupler; the four phase shifters in the second waveguide feeding network each have two ports, and the two ports are respectively referred to as the first port and the second port; the second waveguide feeding network The four phase shifters in the second waveguide feeding network are respectively referred to as the fourth phase shifter, the fifth phase shifter, the sixth phase shifter and the seventh phase shifter. The four absorbing devices in the second waveguide feeding network each have two ports, which are respectively referred to as the first port and the second port. The four absorbing devices in the second waveguide feeding network are respectively referred to as the fourth absorbing device, the fifth absorbing device, the sixth absorbing device and the seventh absorbing device. The four short-circuit blocks in the second waveguide feeding network are respectively referred to as the fourth short-circuit block, the fifth short-circuit block, the sixth short-circuit block and the seventh short-circuit block. The fourteen double-ridge waveguide transitions in the second waveguide feeding network are respectively referred to as the fourth short-circuit block, the fifth short-circuit block, the sixth short-circuit block and the seventh short-circuit block. Each head has an input port and an output port; the fourteen double-ridge waveguide adapters in the second waveguide feeding network are respectively referred to as the ninth double-ridge waveguide adapter, the tenth double-ridge waveguide adapter, the eleventh double-ridge waveguide adapter, the twelfth double-ridge waveguide adapter, the thirteenth double-ridge waveguide adapter, the fourteenth double-ridge waveguide adapter, the fifteenth double-ridge waveguide adapter, the sixteenth double-ridge waveguide adapter, the seventeenth double-ridge waveguide adapter, the eighteenth double-ridge waveguide adapter, the nineteenth double-ridge waveguide adapter, the twentieth double-ridge waveguide adapter, the twenty-first ridge waveguide adapter and the twenty-second double-ridge waveguide adapter;The fourth short-circuit block is connected to the first port of the fourth absorbing device to isolate the energy of the first port of the fourth absorbing device. The second port of the fourth absorbing device is connected to the first port of the fourth coupler to absorb the energy of the first port of the fourth coupler. The output port of the ninth double-ridged waveguide adapter is connected to the fourth port of the fourth coupler. The input port of the tenth double-ridged waveguide adapter and the input port of the twelfth double-ridged waveguide adapter are both connected to the third port of the fourth coupler. The first port of the fourth phase shifter is connected to the second port of the fourth coupler. The second port of the fourth phase shifter is connected to the input port of the thirteenth double-ridged waveguide adapter. The input port of the eleventh double-ridged waveguide adapter is connected to the fourth port of the fifth coupler. The fourteenth double-ridged waveguide adapter is connected to the fourth port of the fifth coupler. The input port of the connector is connected to the third port of the fifth coupler, the fifth short-circuit block is connected to the first port of the fifth absorbing device, for isolating the energy of the first port of the fifth absorbing device, the first port of the fifth phase shifter is connected to the second port of the fifth coupler, the second port of the fifth absorbing device is connected to the first port of the fifth coupler, for absorbing the energy of the first port of the fifth coupler, the sixth short-circuit block is connected to the second port of the sixth absorbing device, for isolating the energy of the second port of the sixth absorbing device, the second port of the sixth phase shifter is connected to the first port of the sixth coupler, the first port of the sixth absorbing device is connected to the second port of the sixth coupler, for absorbing the energy of the second port of the sixth coupler, and the input port of the nineteenth double-ridge waveguide adapter. The input port of the seventeenth double-ridged waveguide adapter is connected to the third port of the sixth coupler, the input port of the seventeenth double-ridged waveguide adapter is connected to the fourth port of the sixth coupler, the input port of the sixteenth double-ridged waveguide adapter is connected to the first port of the sixth phase shifter, the input port of the eighteenth double-ridged waveguide adapter is connected to the first port of the seventh phase shifter, the second port of the seventh phase shifter is connected to the first port of the seventh coupler, the first port of the seventh absorber is connected to the second port of the seventh coupler, and is used to absorb energy from the second port of the seventh coupler, the seventh short-circuit block is connected to the second port of the seventh absorber, and is used to isolate energy from the second port of the seventh absorber; the input port of the twenty-first double-ridged waveguide adapter is connected to the third port of the seventh coupler, and the twentieth double-ridged waveguide adapter is connected to the third port of the seventh coupler. The input port of the adapter and the input port of the twenty-second double-ridged waveguide adapter are connected to the fourth port of the seventh coupler. The input port of the ninth double-ridged waveguide adapter is the first input port of the second waveguide feeding network and is connected to the first output port of the first waveguide feeding network. The input port of the eleventh double-ridged waveguide adapter is the second input port of the second waveguide feeding network and is connected to the second output port of the first waveguide feeding network. The input port of the nineteenth double-ridged waveguide adapter is the third input port of the second waveguide feeding network and is connected to the third output port of the first waveguide feeding network. The input port of the twenty-first double-ridged waveguide adapter is the fourth input port of the second waveguide feeding network and is connected to the fourth output port of the first waveguide feeding network. The output port of the tenth double-ridge waveguide adapter is the first output port of the second waveguide feeding network, the output port of the twelfth double-ridge waveguide adapter is the second output port of the second waveguide feeding network, the output port of the thirteenth double-ridge waveguide adapter is the third output port of the second waveguide feeding network, the output port of the fourteenth double-ridge waveguide adapter is the fourth output port of the second waveguide feeding network, the output port of the fifteenth double-ridge waveguide adapter is the fifth output port of the second waveguide feeding network, the output port of the sixteenth double-ridge waveguide adapter is the sixth output port of the second waveguide feeding network, the output port of the seventeenth double-ridge waveguide adapter is the seventh output port of the second waveguide feeding network, the output port of the eighteenth double-ridge waveguide adapter is the eighth output port of the second waveguide feeding network, the output port of the twentieth double-ridge waveguide adapter is the ninth output port of the second waveguide feeding network, and the output port of the twenty-second double-ridge waveguide adapter is the tenth output port of the second waveguide feeding network. The first output port to the tenth output port of the second waveguide feeding network are used to transmit signals to the third waveguide feeding network.

3. The broadband low-profile cosecant square phased array antenna according to claim 2, characterized in that The third waveguide feeding network includes a third metal plate, two one-to-nine power splitters, six one-to-three power splitters, two one-to-two power splitters and ten double-ridge waveguide adapters. The third metal plate is a rectangular structure, and its length direction is divided along the left-right direction, the width direction is along the front-to-back direction, and the height direction is along the up-down direction. The third metal plate is located on the rear side of the second metal plate, the front end face of the third metal plate is fixed to the rear end face of the second metal plate, and is in a bonded state. The left end face of the third metal plate and the left end face of the second metal plate are located in the same plane, the right end face of the third metal plate and the right end face of the second metal plate are located in the same plane, the upper end face of the third metal plate and the upper end face of the second metal plate are located in the same plane, and the lower end face of the third metal plate and the lower end face of the second metal plate are located in the same plane; two one-to-nine power splitters, six one-to-three power splitters, two one-to-two power splitters, and ten double-ridge waveguide adapters are all arranged on the third metal plate. The two one-to-nine power splitters each have an input port and nine output ports, which divide the two one-to-nine power splitters into Also known as the first one-to-nine power splitter and the second one-to-nine power splitter, the two one-to-two power splitters each have one input port and two output ports, the two one-to-two power splitters are respectively referred to as the first one-to-two power splitter and the second one-to-two power splitter, the six one-to-three power splitters each have one input port and three output ports, the six one-to-three power splitters are respectively referred to as the first one-to-three power splitter, the second one-to-three power splitter, the third one-to-three power splitter, the fourth one-to-three power splitter, the fifth one-to-three power splitter and the sixth one-to-three A power divider, wherein each of the ten double-ridged waveguide adapters has an input port and an output port, and the ten double-ridged waveguide adapters are respectively referred to as a twenty-third double-ridged waveguide adapter, a twenty-fourth double-ridged waveguide adapter, a twenty-fifth double-ridged waveguide adapter, a twenty-sixth double-ridged waveguide adapter, a twenty-seventh double-ridged waveguide adapter, a twenty-eighth double-ridged waveguide adapter, a twenty-ninth double-ridged waveguide adapter, a thirtieth double-ridged waveguide adapter, a thirty-first double-ridged waveguide adapter, and a thirty-second double-ridged waveguide adapter; The output port of the twenty-third double-ridged waveguide adapter is connected to the input port of the first one-to-nine power splitter, the output port of the twenty-fourth double-ridged waveguide adapter is connected to the input port of the first one-to-three power splitter, the output port of the twenty-fifth double-ridged waveguide adapter is connected to the input port of the second one-to-three power splitter, the output port of the twenty-sixth double-ridged waveguide adapter is connected to the input port of the third one-to-three power splitter, the output port of the twenty-seventh double-ridged waveguide adapter is connected to the input port of the first one-to-two power splitter, the output port of the thirty-second double-ridged waveguide adapter is connected to the input port of the second one-to-nine power splitter, the output port of the thirty-first double-ridged waveguide adapter is connected to the input port of the sixth one-to-three power splitter, and the output port of the thirtieth double-ridged waveguide adapter is connected to the input port of the fifth The input port of the one-to-three power splitter is connected, the output port of the thirty-first double-ridge waveguide adapter is connected to the input port of the fourth one-to-three power splitter, and the output port of the thirty-second double-ridge waveguide adapter is connected to the input port of the second one-to-two power splitter; the input port of the twenty-third double-ridge waveguide adapter is the first input port of the third waveguide feeding network, the input port of the twenty-fourth double-ridge waveguide adapter is the second input port of the third waveguide feeding network, the input port of the twenty-fifth double-ridge waveguide adapter is the third input port of the third waveguide feeding network, the input port of the twenty-sixth double-ridge waveguide adapter is the fourth input port of the third waveguide feeding network, the input port of the twenty-seventh double-ridge waveguide adapter is the fifth input port of the third waveguide feeding network, and the twenty-eighth double-ridge waveguide adapter is the fifth input port of the third waveguide feeding network. The input port of the ridge waveguide adapter is the sixth input port of the third waveguide feeding network, the input port of the twenty-ninth double-ridge waveguide adapter is the seventh input port of the third waveguide feeding network, the input port of the thirtieth double-ridge waveguide adapter is the eighth input port of the third waveguide feeding network, the input port of the thirty-first double-ridge waveguide adapter is the ninth input port of the third waveguide feeding network, the input port of the thirty-second double-ridge waveguide adapter is the tenth input port of the third waveguide feeding network, the first input port of the third waveguide feeding network is connected to the first output port of the second waveguide feeding network, the second input port of the third waveguide feeding network is connected to the second output port of the second waveguide feeding network, and the third input port of the third waveguide feeding network is connected to the second waveguide feeding network. the third output port of the third waveguide feed network being connected to the fourth output port of the second waveguide feed network, the fourth input port of the third waveguide feed network being connected to the fourth output port of the second waveguide feed network, the fifth input port of the third waveguide feed network being connected to the fifth output port of the second waveguide feed network, the sixth input port of the third waveguide feed network being connected to the sixth output port of the second waveguide feed network, the seventh input port of the third waveguide feed network being connected to the seventh output port of the second waveguide feed network, the eighth input port of the third waveguide feed network being connected to the eighth output port of the second waveguide feed network, the ninth input port of the third waveguide feed network being connected to the ninth output port of the second waveguide feed network, and the tenth input port of the third waveguide feed network being connected to the tenth output port of the second waveguide feed network;The nine output ports of the first one-to-nine power splitter, the three output ports of the first one-to-three power splitter, the three output ports of the second one-to-three power splitter, the three output ports of the third one-to-three power splitter, the two output ports of the first one-to-two power splitter, the two output ports of the second one-to-two power splitter, the three output ports of the fourth one-to-three power splitter, the three output ports of the fifth one-to-three power splitter, the three output ports of the sixth one-to-three power splitter, and the nine output ports of the second one-to-nine power splitter, totaling forty output ports, serve as the forty output ports of the third waveguide feeding network, for outputting signals to the radiating network.

4. The broadband, low-profile cosecant square phased array antenna according to claim 3, characterized in that The radiation network includes a fourth metal plate and forty radiation units arranged on the fourth metal plate. The fourth metal plate is a rectangular structure. The length direction of the fourth metal plate is along the left-right direction, the width direction is along the front-back direction, and the height direction is along the up-down direction. The fourth metal plate is located above the first metal plate, the second metal plate and the third metal plate. The front end face of the fourth metal plate is flush with the front end face of the first metal plate, the rear end face of the fourth metal plate is flush with the rear end face of the first metal plate, the front end face of the fourth metal plate is flush with the front end face of the first metal plate, the rear end face of the fourth metal plate is flush with the rear end face of the third metal plate, the lower end face of the fourth metal plate is fixedly connected to the upper end face of the first metal plate, the upper end face of the second metal plate and the upper end face of the third metal plate, and are in a fitted state. The forty radiation units The units are evenly spaced along a row from left to right; each radiation unit includes a first cavity, a second cavity, a first metal block, a second metal block, a third metal block, a fourth metal block, a fifth metal block, a sixth metal block, a seventh metal block, an eighth metal block and an input cavity; the first cavity, the second cavity, the first metal block, the second metal block, the third metal block, the fourth metal block, the fifth metal block, the sixth metal block, the seventh metal block, the eighth metal block and the input cavity are all rectangular parallelepiped structures; the length directions of the first cavity, the second cavity, the first metal block, the second metal block, the third metal block, the fourth metal block, the fifth metal block, the sixth metal block, the seventh metal block, the eighth metal block and the input cavity are all along the left-right direction, the width directions are all along the front-to-back direction, and the height directions are all along the up-down direction;The first cavity and the second cavity are respectively opened on the fourth metal plate, the first cavity is located above the second cavity, the upper end face of the first cavity is flush with the upper end face of the fourth metal plate, the lower end face of the first cavity is connected to the upper end face of the second cavity and are in a fitted state, the front end face of the first cavity is flush with the front end face of the fourth metal plate, the rear end face of the first cavity is flush with the rear end face of the fourth metal plate, the lower end face of the second cavity is located above the lower end face of the fourth metal plate, the length of the second cavity is smaller than the length of the first cavity, the width of the second cavity is smaller than the width of the first cavity, the plane that makes the first cavity bilaterally symmetrical is called the first symmetrical plane, the second cavity is bilaterally symmetrical about the first symmetrical plane, the plane that makes the first cavity front-to-back symmetrical is called the second symmetrical plane, the second cavity is front-to-back symmetrical about the second symmetrical plane, the first metal block is located in the first cavity, the upper end face of the first metal block is located below the upper end face of the first cavity, the The lower end face of a metal block is located in the same plane as the lower end face of the first cavity, the width of the first metal block is smaller than the width of the second cavity, the right end face of the first metal block is located in the same plane as the right end face of the first cavity, the left end face of the first metal block is located to the left of the plane where the right end face of the second cavity is located and to the right of the first symmetry plane, the first metal block is symmetrical front-to-back about the second symmetry plane, the second metal block is located in the first cavity, the second metal block is located to the left of the first metal block, the upper end face of the second metal block is located below the plane where the upper end face of the first metal block is located, the lower end face of the second metal block is located in the same plane as the lower end face of the first metal block, the right end face of the second metal block is connected to the left end face of the first metal block and is in a fitted state, the width of the second metal block is equal to the width of the first metal block, the second metal block is symmetrical front-to-back about the second symmetry plane, and the right end face of the second metal block is located to the left of the first symmetry plane;The third metal block is located in the second cavity, the upper end face of the third metal block is flush with the upper end face of the second cavity, the upper end face of the third metal block is connected to the lower end face of the first metal block and the lower end face of the second metal block, and is in a fitted state, the front end face of the third metal block is located in the same plane as the front end face of the first metal block, the rear end face of the third metal block is located in the same plane as the rear end face of the first metal block, the right end face of the third metal block is located in the same plane as the right end face of the second cavity, the left end face of the third metal block is located to the left of the plane where the left end face of the second metal block is located and to the right of the first symmetry plane, the fourth metal block is located in the second cavity The fourth metal block is located below the third metal block in the cavity, the upper end face of the fourth metal block is connected to the lower end face of the third metal block and is in a fitted state, the right end face of the fourth metal block is located in the same plane as the right end face of the second metal block, the left end face of the fourth metal block is located in the same plane as the left end face of the third metal block, the rear end face of the fourth metal block is flush with the rear end face of the third metal block, the front end face of the fourth metal block is flush with the front end face of the third metal block, the lower end face of the fourth metal block is located above the lower end face of the second cavity, the fifth metal block is located in the second cavity, the fifth metal block is located below the fourth metal block, the upper end face of the fifth metal block The end face is connected to the lower end face of the fourth metal block and is in a fitted state. The lower end face of the fifth metal block and the lower end face of the second cavity are located in the same plane. The right end face of the fifth metal block and the right end face of the fourth metal block are located in the same plane. The left end face of the fifth metal block and the left end face of the fourth metal block are located in the same plane. The rear end face of the fifth metal block and the rear end face of the fourth metal block are located in the same plane. The front end face of the fifth metal block is located on the rear side of the front end face of the second cavity and in front of the plane where the front end face of the fourth metal block is located. The input cavity is located below the fifth metal block, and the upper end face of the input cavity and the lower end face of the second cavity are located in the same plane. , the lower end face of the input cavity and the lower end face of the fourth metal plate are located in the same plane, the front end face of the input cavity is located on the rear side of the front end face of the second cavity and on the front side of the plane where the front end face of the fifth metal block is located, the right end face of the input cavity is located on the left side of the right end face of the second cavity and on the right side of the plane where the right end face of the fifth metal block is located, the left end face of the input cavity is located on the left side of the plane where the left end face of the fifth metal block is located and on the right side of the first symmetry plane, the rear end face of the input cavity is located on the front side of the plane where the front end face of the fourth metal block is located and on the rear side of the plane where the front end face of the fifth metal block is located, and the lower end face of the input cavity is the input port of the radiation unit;The sixth metal block is located in the first cavity, the upper end face of the sixth metal block is located below the upper end face of the first cavity, the lower end face of the sixth metal block and the lower end face of the first cavity are located in the same plane, the width of the sixth metal block is equal to the width of the first metal block, the left end face of the sixth metal block and the left end face of the first cavity are located in the same plane, the right end face of the sixth metal block is located to the right of the plane where the left end face of the second cavity is located and to the left of the first symmetry plane, the sixth metal block is symmetrical front to back about the second symmetry plane, the seventh metal block is located in the first cavity, the seventh metal block is located to the right of the sixth metal block, the upper end face of the seventh metal block is located below the upper end face of the first cavity, the lower end face of the seventh metal block and the lower end face of the first cavity are located in the same plane, the left end face of the seventh metal block is connected to the right end face of the sixth metal block and is in a fitted state, the right end face of the seventh metal block is located to the right of the left end face of the second cavity and to the left of the first symmetry plane, and the width of the seventh metal block is equal to the front end face of the sixth metal block. The seventh metal block is located in the same plane, and is symmetrical front-to-back about the second symmetry plane. The eighth metal block is located in the second cavity. The upper end surface of the eighth metal block is flush with the upper end surface of the second cavity. The upper end surface of the eighth metal block is connected to the lower end surface of the sixth metal block and the lower end surface of the seventh metal block, respectively, and is in a bonded state. The front end surface of the eighth metal block is located in the same plane as the front end surface of the sixth metal block, the rear end surface of the eighth metal block is located in the same plane as the rear end surface of the sixth metal block, the lower end surface of the eighth metal block is located in the same plane as the lower end surface of the second cavity, the left end surface of the eighth metal block is located in the same plane as the left end surface of the second cavity, and the right end surface of the eighth metal block is located to the left of the plane containing the right end surface of the second cavity and to the left of the first symmetry plane. The input ports of the forty radiating units, a total of forty input ports, are forty input ports of the radiating network, which are connected one-to-one with the forty output ports of the third waveguide feeding network and are used to receive signals transmitted by the third waveguide feeding network.

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