Beam broadening device, wide-beam fuze antenna module and guided weapon

Abstract

The invention relates to the technical field of antennas, and provides a beam broadening device which comprises a corner reflector and a supporting structure which can be arranged on a fuze antenna, an electromagnetic metamaterial plate used for increasing the beam width is erected on the supporting structure, and the corner reflector is located in an interval defined by the electromagnetic metamaterial plate and the supporting structure. The invention further provides a wide-beam fuze antenna module, the wide-beam fuze antenna module comprises a fuze antenna and the beam broadening device, the fuze antenna comprises a groove waveguide, a radiation slot is formed in the upper surface of the groove waveguide, and the beam broadening device is arranged on the upper surface of the groove waveguide. The invention further provides a guided weapon which is characterized by comprising the wide-beam fuze antenna module. According to the invention, the corner reflector is adopted to improve the gain of the fuze antenna, and then the wave beam width of the azimuth plane is improved through the electromagnetic wave metamaterial plate, so that the non-blind area design is realized.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a beam broadening device, a wide-beam fuze antenna module and a guided weapon. Background Art

[0002] The radio fuze is a proximity fuze that is widely used in tactical and strategic missiles. It uses electromagnetic waves to sense and acquire target information, and detonates the warhead at the optimal explosion point between the fuze and the target. The target is detected by the emitted electromagnetic waves. After the antenna receives the signal reflected by the target, the system processes the signal to obtain relevant information such as the target's position, speed, and distance. When this information meets the preset conditions, a start signal is output to start the execution level, detonate the warhead to kill the target, and thus obtain the best fuze-war coordination efficiency.

[0003] Millimeter-wave proximity fuzes have strict requirements for the antennas of various electronic devices such as communications and radars mounted on them. Not only do they need to meet electrical properties such as antenna gain and lobe width, but they also require the antenna to be small in size and light in weight, and have special requirements for assembly position and assembly space. There are two types of antennas that meet these requirements, namely waveguide slot antennas and microstrip antennas. Since waveguide slot antennas have higher radiation efficiency than microstrip antennas, and have advantages such as convenient feeding, strong structure, and high reliability, they have been widely used in millimeter-wave proximity fuzes and other fields.

[0004] Fuze antennas are usually installed in a side-fire or end-fire mode, but when the missile head is the installation location for systems such as the seeker and laser guidance, end-fire or side-fire arrays will not meet the requirements. According to the technical requirements of the fuze, when the antenna is installed on the surface of the cabin, the radiation pattern should form a conical beam:

[0005] (a) The main lobe beam in the elevation plane should be tilted at a certain angle to detect the target in advance and detonate the warhead at the best position. At the same time, the narrower the elevation plane antenna beam is, the more conducive it is to improving the fuze spatial resolution and explosion point control accuracy, and also to improving the fuze's anti-interference ability. However, the antenna beam width must also meet the requirements of the fuze's target detection and signal processing time, requiring the antenna beam to have sufficient width.

[0006] (b) The azimuth beam should achieve high gain in the omnidirectional range to avoid detection blind spots.

[0007] In the prior art, a waveguide slot antenna is used as a fuze antenna to achieve a wide beam antenna with a beam tilt angle of 65°, and a wide roll surface with a high beam width of >120°. However, there is still a blind spot in the beam range above >60°, and the problem of beam notch needs to be solved.

[0008] At present, most fuze antennas use six to ten array antennas arranged around the bulkhead to achieve omnidirectional high-gain conical beams in the azimuth plane. This method also requires an increase in the number of RF front-end power amplifiers, which increases the cost and complexity; the mutual coupling between antennas is serious, which also greatly affects the radiation pattern;

[0009] With the development of air-to-air combat technology, millimeter wave fuzes need to be suitable for application scenarios with high-speed missile-target intersection speed. In this application environment, the main lobe width of the pitch plane cannot be too narrow to ensure sufficient time for fuze-warfare coordination design, that is, the number of antenna array elements is limited. Therefore, the method of increasing the gain by increasing the number of antenna array elements is not applicable in fuze antenna design, and realizing a wide-beam, high-gain tilted beam fuze antenna is still a problem to be solved. Summary of the invention

[0010] The object of the present invention is to provide a beam broadening device, a wide beam fuze antenna module and a guided weapon, which can at least solve some of the defects in the prior art.

[0011] To achieve the above-mentioned purpose, an embodiment of the present invention provides the following technical solution: a beam broadening device, comprising a corner reflector and a support structure that can be arranged on a fuze antenna, an electromagnetic metamaterial plate for increasing the beam width is mounted on the support structure, and the corner reflector is located in an area enclosed by the electromagnetic metamaterial plate and the support structure.

[0012] Furthermore, the corner reflector is in a prism shape, the electromagnetic metamaterial plate is arranged on the top surface of the corner reflector, the bottom surface of the corner reflector falls on the fuze antenna, and the surface of the corner emitter for receiving the electromagnetic waves output by the fuze antenna is an inclined surface.

[0013] Furthermore, the angle between the inclined surface and the vertical direction is controlled between 45° and 55°.

[0014] Furthermore, the electromagnetic metamaterial plate is provided with a plurality of slits, each of which penetrates the electromagnetic metamaterial plate, and each of which is arranged in a straight line and spaced apart in sequence.

[0015] Furthermore, the interval d between adjacent gaps satisfies the following range: 2π(β0+k0)<d<4π(β0+k0), and the length of the gap is not greater than

[0016] Furthermore, the upper surface of the electromagnetic metamaterial plate is covered with a copper layer, and each of the gaps is located on the copper layer.

[0017] Furthermore, the support structure includes two dielectric support plates, the two dielectric support plates are arranged at an interval, the corner reflector is located in the interval, and the dielectric constant of each dielectric support plate is between 2 and 2.4.

[0018] An embodiment of the present invention provides another technical solution: a wide-beam fuze antenna module, comprising a fuze antenna and the above-mentioned beam widening device, wherein the fuze antenna comprises a slot waveguide, a radiation slot is opened on the upper surface of the slot waveguide, and the beam widening device is arranged on the upper surface of the slot waveguide.

[0019] Furthermore, the slot waveguide includes a first conductor plate and a second conductor plate, the first conductor plate has a flat portion and a protruding portion arranged within the flat portion, the protruding portion and the flat portion form a stepped structure, the protruding portion is provided with an open slot, the opening of the open slot is located on the side of the protruding portion away from the flat portion, and the second conductor plate blocks the open slot to form a resonant cavity.

[0020] An embodiment of the present invention provides another technical solution: a guided weapon, characterized in that it includes the above-mentioned wide-beam fuze antenna module.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Use corner reflectors to increase the gain of the fuze antenna, and then use the electromagnetic wave metamaterial plate to increase the beam width in the azimuth plane, thereby achieving a design without blind spots.

[0023] 2. The impedance of the fuze antenna can be adjusted by controlling the beam widening device, thereby achieving impedance matching within an ultra-wide frequency band and improving antenna performance.

[0024] 3. The first waveguide plate is designed to be a stepped structure to facilitate assembly in a military missile-carrying environment.

[0025] 4. The vertical section height of the fuze antenna is low, which allows for miniaturization and ease of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram (perspective diagram) of a wide beam fuze antenna module provided by an embodiment of the present invention;

[0027] Figure 2 for Figure 1 The schematic diagram of the electromagnetic metamaterial plate has been removed;

[0028] Figure 3 for Figure 1 A schematic vertical cross-sectional view of the main viewing angle;

[0029] Figure 4 for Figure 1 A vertical cross-sectional schematic diagram from a side view perspective;

[0030] Figure 5The figure is a schematic diagram of the matching performance (VSWR) of a beam widening device of the present invention within the working frequency band.

[0031] Figure 6 It is a comparison diagram of the antenna gain of a beam widening device of the present invention at the working frequency and the antenna gain of an antenna without the beam widening device loaded;

[0032] Figure 7 It is a comparison diagram of the antenna gain of the elevation plane of a beam widening device of the present invention at the working frequency point and the antenna gain without the beam widening device loaded;

[0033] Figure 8 It is a three-dimensional diagram of the antenna gain of a beam broadening device of the present invention at the working frequency point;

[0034] Fig. 9 It is a transmit-receive isolation curve of a beam broadening device in the working frequency range of the present invention;

[0035] In the figure numbers: 1-corner reflector; 10-inclined surface; 2-dielectric support plate; 3-electromagnetic metamaterial plate; 30-copper layer; 31-gap; 4-slot waveguide; 40-first conductor plate; 400-flat plate portion; 401-protruding portion; 402-resonant cavity; 403-radiation gap; 41-second conductor plate; 5-feeding connector; 6-absorption load; 7-fixing hole. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figures 1 to 4, an embodiment of the present invention provides a beam broadening device for Ka band. It includes a corner reflector 1 and a support structure that can be arranged on the fuze antenna, an electromagnetic metamaterial plate 3 for increasing the beam width is mounted on the support structure, and the corner reflector 1 is located in the interval formed by the electromagnetic metamaterial plate 3 and the support structure. In this embodiment, the corner reflector 1 is used to increase the gain of the fuze antenna, and then the beam width of the azimuth plane is increased by the electromagnetic wave metamaterial plate, so as to achieve a blind spot-free design. Specifically, the device can be directly used on the fuze antenna, and it specifically includes a corner reflector 1, a support structure, an electromagnetic metamaterial plate 3 and other components. Among them, the corner reflector 1 can produce concentrated reflection on the metal surface, concentrate the gain of the fuze antenna in a certain radiation area, and then increase the beam width of the azimuth plane by the electromagnetic metamaterial plate 3, so as to achieve a blind spot-free design. In addition, the support structure can support the electromagnetic metamaterial plate 3, and at the same time, the electromagnetic metamaterial plate 3 can be put aside to create a gap between the fuze antenna, so that the corner reflector 1 can be set in the interval. After the device is applied to the fuze antenna, it can be used for millimeter-wave proximity fuzes in high-speed missile-target intersection scenarios to increase the detectable range and solve the problem of blind spots in the detection range. Preferably, a single fuze antenna with the beam widening device can achieve a high-gain surround signal in a 180° direction. Usually, a fuze antenna with the beam widening device is installed on each side of the missile to achieve a 360° high-gain surround signal.

[0038] See also Figures 1 to 4 , refine the above-mentioned corner reflector 1, which is generally in the shape of a prism. Its top and bottom surfaces are both quadrilaterals, wherein the electromagnetic metamaterial plate 3 can be arranged on the top surface, and the bottom surface can fall on the fuze antenna. By designing the inclined surface 10, the electromagnetic waves output by the fuze antenna can be reflected, thereby improving the gain. Preferably, the angle between the inclined surface 10 and the vertical direction is controlled between 45 and 55 degrees. When the angle of the inclined surface 10 of the corner reflector 1 changes, the field intensity at the same point of the stimulated antenna is Different, after simulation experiments, the closer the angle is to 55°, the better the gain effect. Preferably, the side of the corner reflector 1 relative to the inclined plane 10 is a vertical plane, so that the corner reflector 1 will not exceed the edge when it is arranged between the electromagnetic metamaterial plate 3 and the fuze antenna, thereby improving the overall consistency of the device. Preferably, the corner reflector 1 is installed on a single side of the waveguide slot 31 array, and is installed at a position of 5 to 6 mm from the center of the resonant cavity 402 of the fuze antenna. In addition, the corner reflector 1, as a metal reflective surface, effectively reflects electromagnetic waves, which can change the lobe pattern of the radiation unit, obtain a higher gain and a sharper radiation direction, thereby reducing the side lobe energy and concentrating the radiation energy in the target area. For the λ / 2 stimulated antenna without the corner reflector 1, its field strength at the same point is E(φ)=2kI1|[cos(S r cosφ)-cos(S rsinφ)], where the angle between the excited unit and point P in the far field is φ, S r is the electrical distance from the vertex of the angle to each unit, S r =2π(S / λ). Current distribution of the excited unit after applying a certain angle of the corner reflector 4 Where R 11 and R 1L is the self-impedance loss, R 14 and R 12 is the mutual impedance loss after taking the image of the excitation source. The power value applied to the excited unit is P. The field strength of the excited antenna unit is E H (φ) can be obtained. The angle of the corner reflector and the distance from the surface gap jointly determine the excitation field E H (φ).

[0039] See also Figures 1 to 4 , refine the above-mentioned electromagnetic metamaterial plate 3. The electromagnetic metamaterial plate 3 is provided with a plurality of slits 31, each of the slits 31 penetrates the electromagnetic metamaterial plate 3, and each of the slits 31 is arranged in a straight line in sequence. In this embodiment, the design of the slits 31 can facilitate the radiation of the broadened electromagnetic waves. Preferably, in order to ensure that the spatial harmonics formed after the reflector can be radiated through the electromagnetic metamaterial, the range of the spacing d between adjacent slits 31 satisfies: 2π(β0+k0)<d<4π(β0+k0), wherein β0 and k0 are the phase constant and propagation constant of the main mode propagating in the waveguide, respectively. Moreover, the length of the slit 31 is not greater than Where λ0 is the wavelength in free space, ε r is the relative dielectric constant of the electromagnetic metamaterial substrate in the beam broadening device. Preferably, the upper surface of the electromagnetic metamaterial plate 3 is covered with a copper layer 30, and each of the slits 31 is located on the copper layer 30. The copper layer 30 is provided on the substrate of the electromagnetic metamaterial plate 3. Preferably, the thickness of the electromagnetic metamaterial plate 3 is preferably 0.5 to 1 mm. The value range of the spacing p is preferably 4.7 to 5.3 mm. In addition, the determination of the window sizes a and b of the slits 31 of the electromagnetic metamaterial determines the radiation field E after beam broadening. obj and Establish a corresponding relationship. After optimization, a and b are 2.9 mm and 1.5 mm respectively. The slot 31 window corresponds to the N waveguide slot 31 array elements one by one. Calculate the phase modulation parameters required to achieve beam broadening The phase modulation value is mainly achieved by adjusting the length and width of the slot 31 window, and the radiation field function E after beam broadening is established. obj and , and then the phase compensation required for the target pattern can be deduced. Preferably, the length and width parameters a of each slot 31 are 2.85-2.95 mm, and b is 1.45-1.55 mm. In order to achieve the broadening of the radiation beam, on the one hand, the corner reflector 1 is required to focus the energy of the beams in other directions, and at the same time, the electromagnetic metamaterial needs to introduce a certain phase shift, that is, phase modulation, to change the phase characteristics of the electromagnetic wave, thereby achieving the target beam radiation characteristics. Assuming the radiation field after beam broadening: θ0 is the incident wave angle, is the incident wave phase value, j is the imaginary part sign, and k0 is the phase propagation constant. To change the radiation field, the phase modulation parameter where φ p (x) represents the complex x phase, is the phase constant, m, n, and p are the number and period of electromagnetic metamaterial array elements in the x and y directions respectively, and E H (φ) is the conjugate of the radiation field incident on the metamaterial. The phase modulation parameters can be flexibly adjusted by the electromagnetic metamaterial 6. According to the radiation field function E obj and The corresponding relationship is achieved by optimizing the window value of slot 31 to obtain the phase compensation required for the target pattern, and the offset center position range of slot 31 is 0 to 0.8 mm.

[0040] See also Figures 1 to 4 , the above-mentioned support structure is refined, the support structure includes two dielectric support plates 2, the two dielectric support plates 2 are arranged at intervals, the corner reflector 1 is located in the interval, and the dielectric constant of each dielectric support plate 2 is between 2 and 2.4. In this embodiment, two dielectric support plates 2 are used to support the electromagnetic metamaterial plate 3, and the two dielectric support plates 2 can be arranged at both ends of the fuze antenna, so that a hollow space will be formed under the electromagnetic metamaterial plate 3, and the corner reflector 1 can be arranged in the space. The dielectric support plate 2 preferably uses Rogers RT / 5880 substrate, which is a substrate, and the dielectric constant is preferably 2.2.

[0041] See also Figures 1 to 4 The embodiment of the present invention provides a wide beam fuze antenna module, including a fuze antenna and the above-mentioned beam widening device, wherein the fuze antenna includes a slot waveguide 4, a radiation slot 403 is provided on the upper surface of the slot waveguide 4, and the beam widening device is arranged on the upper surface of the slot waveguide 4. In this embodiment, the above-mentioned beam widening device is used on the lead antenna to play a role in beam widening. The radiation slot 403 provided on the upper surface of the slot waveguide 4 facilitates the radiation of electromagnetic waves to the corner reflector 1.

[0042] See also Figures 1 to 4, the slot waveguide 4 is refined, which is composed of two conductor plates. For the convenience of description, the two conductor plates are defined as a first conductor plate 40 and a second conductor plate 41, wherein the first conductor plate 40 has a concave open slot, and when the second conductor plate 41 blocks the open slot, a resonant cavity 402 can be formed in the slot. The first conductor plate 40 can be refined into a flat plate portion 400 and a protruding portion 401. The flat plate portion 400 has a larger area than the protruding portion 401. The protruding portion 401 can be a cubic structure. The structure of the first conductor plate 40 presented at last is similar to a convex structure when viewed from the side. The flat plate portion 400 is preferably a quadrilateral, and the edges of its four sides must extend beyond the protruding portion 401, thus forming a step structure. The step form can be conveniently installed on the side wall of missiles and drone-mounted missiles, and is convenient for use in military missile-mounted environments.

[0043] See also Figures 1 to 4 , refine the radiation slots 403 opened on the upper surface of the slot waveguide 4. The number of the radiation slots 403 is consistent with the number of the slots 31 starting from the electromagnetic metamaterial plate 3. The radiation slots 403 can be arranged in a straight line. The offset position of the radiation slot 403 is synthesized by the PSO optimization algorithm, and the optimal solution is found with low side lobe as the adaptability function.

[0044] See also Figures 1 to 4 , the above-mentioned slot waveguide 4 is refined, a through hole is provided on the conductor plate of the waveguide slot for the feed connector 5 to extend into the resonant cavity 402, the other end of the feed connector 5 is outside the waveguide slot, and a load terminal is provided in the resonant cavity 402. The feed connector 5 and the load terminal are arranged at intervals and are respectively located at both ends of the resonant cavity 402. The feed connector 5 can be connected to an external RF front-end circuit, and the RF front-end circuit outputs power. After receiving the signal, the feed connector 5 generates electromagnetic waves through the resonant cavity 402 and radiates from the radiation gap 403. This is the first radiation, and then it is widened by the beam widening device, which is the second radiation. The resonant cavity 402 is used to transmit electromagnetic waves. Preferably, the upper conductor plate and the lower conductor plate of the waveguide slot are fixed by fixing holes 7, and the fixing holes 7 can be threaded holes, which are fixed with screws. The electromagnetic metamaterial plate 3 is also fixedly connected to the dielectric support plate 2 through the fixing holes 7. The spacing between two adjacent fixing holes 7 in the waveguide slot is controlled to be between 8 and 10 mm. Preferably, the first conductor plate 40 and the second conductor plate 41 are both made of copper, and the inner surface is silver-plated to improve the transmission efficiency and reduce the transmission loss. Figure 1 and Figure 2The arrangement is carried out in the direction shown, and the second conductor plate 41 can also be on the top and the first conductor plate 40 can be on the bottom, but it should be noted that the radiation gap 403 is designed on the upper conductor plate. Preferably, the feed connector 5 preferably adopts the SMP feeding form, and its insulating material can be PTFE material. The probe caliber is controlled between 0.3 and 0.5 mm. The feed probe needs to be inserted into the resonant cavity 402 to a certain depth and then fixed by laser sealing. Preferably, the absorption load 6 is preferably made of epoxy absorbing material to absorb the residual power of the traveling wave antenna and avoid reflection. The absorption coefficient of the epoxy absorbing material is greater than 10dB in DC to 40GHz. The terminal load can be designed into a variety of structural forms, such as a single-pointed wedge shape, a pointed cone shape, etc. Preferably, the resonant cavity 402 is a rectangular parallelepiped structure, and the selection of the cross-sectional dimensions length a and width b is the same as that of the traditional rectangular waveguide, which is related to the operating frequency; at the same time, in order to generate a beam with an angle of φ deviating from the normal direction of the array, the relationship between the beam width and the beam inclination is: a=λ0 / 2sinθ.

[0045] See also Figures 1 to 4 , the installation method of this wide beam fuze antenna module is as follows:

[0046] a. Install the SMP feed connector 5: screw the SMP feed connector into the lower conductor plate feed end of the rectangular slot waveguide, and fix the connector by laser sealing;

[0047] b. Install the terminal absorption load 6: Use the slot designed in the rectangular slot waveguide to fix the terminal absorption load 64 to the lower conductor plate, and then align the slot of the upper conductor plate with the load for assembly;

[0048] c. Assembling and fixing the fuze antenna: The upper conductor plate and the lower conductor plate of the rectangular slot waveguide are assembled by a circle of countersunk screws. The threaded holes should be as many as possible to ensure the fit between the upper conductor plate and the lower conductor. When assembling, place the corner reflector 1 in the corresponding position and fix it using the countersunk hole on one side of the lower conductor plate;

[0049] d. Assemble the cover layer device: Place the electromagnetic metamaterial on top of the support blocks on both sides and fix it with four countersunk screws.

[0050] The antenna matching performance (voltage standing wave ratio) of this embodiment is simulated using the three-dimensional electromagnetic simulation software HFSS. Figure 5 As shown, within the operating frequency range, the voltage standing wave ratio is less than 1.09, indicating that the high-gain wide-beam millimeter-wave fuze antenna is well matched within a wider operating frequency band. In the design, the thickness of the electromagnetic metamaterial substrate in the cover layer device can be adjusted according to the application, and the coupling coefficient can be changed to achieve the effect of adjusting to the best impedance matching.

[0051] As an optimization solution of the embodiment of the present invention, the antenna azimuth gain before and after the beam broadening device is loaded at the working frequency point of the present embodiment is as follows: Figure 6 As shown, the 3dB beam covers the range of -77° to 106°, and the beam width can reach 183°, which meets the design without blind spots. For the case where the beam widening device is not loaded, the 3dB beam covers the range of -71° to 70°, and the beam width reaches 141°. Therefore, by loading the beam width device, the beam can be widened by 30%. Therefore, this embodiment can effectively solve the problem of omnidirectional detection failure caused by the presence of antenna notches. The design of the embodiment not only raises the gain at each angle, but also widens the radiation range of the effective beam, forming an ultra-wide beam, and the radiation performance of the antenna is greatly improved.

[0052] As an optimization solution of the embodiment of the present invention, the two-dimensional diagram of the antenna elevation gain before and after the beam broadening device is loaded at the working frequency point of this embodiment is as follows: Figure 7 As shown in the figure, when the beam widening device is loaded, the angle of the antenna along the loading direction is the plane where theta is located as the main radiation direction, the gain reaches a value of >10dB, and the 3dB beam width can meet the angle range required for the fuze spatial resolution and explosion point control accuracy. Sufficient beam width ensures that the minimum fuze crossing time should be 3 to 5 times the time required for signal processing. Therefore, compared with the case where the beam widening device is not loaded, the elevation plane pattern is basically unaffected, ensuring that the antenna has good radiation capability.

[0053] As an optimization solution of the embodiment of the present invention, the three-dimensional gain of the antenna at the working frequency point of the present embodiment is as follows: Figure 8 As shown, the radiation pattern of the designed beam widening device presents a forward conical beam, which satisfies the fuze antenna radiation effect of having a narrow beam with a specific angle and low side lobes in the elevation plane and an ultra-wide beam in the azimuth plane, thus achieving the expected technical indicators.

[0054] As an optimization solution of the embodiment of the present invention, the isolation between the transmitting and receiving antennas of the embodiment is as follows: Fig. 9 As shown, when the present invention is placed as a transceiver antenna on two sides of the cabin perpendicular to each other, the transceiver isolation is greater than 58dB, that is, the mutual coupling and interference between the transceiver antennas are weak, and the transceiver system is stable.

[0055] As an optimization scheme of the embodiment of the present invention, the above-mentioned beam widening device is adopted. Through three-dimensional electromagnetic simulation, it can be known that the loading widening device can widen the azimuth plane beam by 30%, and the beam coverage range of the antenna is greater than 180°, which can meet the requirements of the fuze antenna for the no-blind-area design, and the matching performance is also improved. Thus, the purpose of high gain and wide beam is achieved, and the detection blind area problem of the fuze antenna is solved.

[0056] As an optimization scheme of the embodiment of the present invention, changing the spacing of the electromagnetic wave emitting slot array elements, or changing the distance from the electromagnetic wave emitting slot to the closed terminal, and the angle between the slot and the axis will affect the radiation direction and radiation intensity of the electromagnetic wave. The present invention can be applied to other frequency bands of millimeter waves and submillimeter waves. If the frequency is changed, the size of the rectangular slot waveguide can be changed accordingly, and the size and position of the electromagnetic wave emitting slot can also be adjusted according to application needs.

[0057] See also Figures 1 to 4 The embodiment of the present invention also provides a guided weapon, which uses the above-mentioned wide-beam fuze antenna module to increase the detectable distance of the guided weapon and solve the problem of blind spots in the detection range.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A beam broadening device, characterized in that: It comprises a corner reflector and a support structure which can be arranged on a fuze antenna. An electromagnetic metamaterial plate for increasing the beam width is mounted on the support structure. The corner reflector is located in an area enclosed by the electromagnetic metamaterial plate and the support structure.

2. The beam broadening device according to claim 1, characterized in that: The corner reflector is in the shape of a prism, the electromagnetic metamaterial plate is arranged on the top surface of the corner reflector, the bottom surface of the corner reflector falls on the fuze antenna, and the surface of the corner emitter for receiving the electromagnetic waves output by the fuze antenna is an inclined surface.

3. The beam broadening device according to claim 2, characterized in that: The angle between the inclined surface and the vertical direction is controlled between 45° and 55°.

4. The beam broadening device according to claim 1, characterized in that: The electromagnetic metamaterial plate is provided with a plurality of slots, each of which penetrates the electromagnetic metamaterial plate, and each of which is arranged in a straight line at intervals.

5. The beam broadening device according to claim 4, characterized in that: The range of the spacing d between adjacent gaps satisfies: 2π(β0+k0)<d<4π(β0+k0), and the length of the gap is not greater than 6. The beam broadening device according to claim 1, characterized in that: The upper surface of the electromagnetic metamaterial plate is covered with a copper layer, and each of the gaps is located on the copper layer.

7. The beam broadening device according to claim 1, characterized in that: The support structure comprises two dielectric support plates, the two dielectric support plates are arranged at an interval, the corner reflector is located in the interval, and the dielectric constant of each dielectric support plate is between 2 and 2.

4.

8. A wide beam fuze antenna module, characterized in that: It comprises a fuze antenna and a beam widening device as described in any one of claims 1 to 7, wherein the fuze antenna comprises a slot waveguide, a radiation slot is provided on the upper surface of the slot waveguide, and the beam widening device is arranged on the upper surface of the slot waveguide.

9. The wide beam fuze antenna module according to claim 8, characterized in that: The slot waveguide includes a first conductor plate and a second conductor plate, the first conductor plate has a flat plate portion and a protruding portion arranged within the flat plate portion, the protruding portion and the flat plate portion form a stepped structure, an open slot is provided on the protruding portion, the opening of the open slot is located on the side of the protruding portion away from the flat plate portion, and the second conductor plate blocks the open slot to form a resonant cavity.

10. A guided weapon, characterized in that: Comprising the wide beam fuze antenna module as claimed in claim 8 or 9.

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