CN-122026072-A - Radiation scattering integrated microstrip antenna based on artificial magnetic conductor

Abstract

The invention discloses a radiation scattering integrated microstrip antenna based on an artificial magnetic conductor, and belongs to the technical field of microwave antennas. The antenna comprises a microstrip antenna, four first artificial magnetic conductor AMC arrays and four second AMC arrays, wherein the microstrip antenna is positioned in the center, and the four first AMC arrays and the four second AMC arrays are distributed on the periphery and are distributed in a chessboard structure mode. Compared with the original microstrip antenna, the radiation scattering integrated microstrip antenna based on the artificial magnetic conductor has the advantages that the bandwidth of the antenna is basically unchanged, the gain of the antenna is improved, the radiation performance of the original radiation antenna is not affected, the RCS of the antenna is effectively reduced in a wide frequency band, the overall section is low, and the antenna can be used in the fields of modern wireless communication systems, electronic reconnaissance, countermeasure and the like.

Inventors

• CHEN ZHIFU
• SHAO WEI
• XIAO LIYE

Assignees

• 电子科技大学

Dates

Publication Date

20260512

Application Date

20260303

Claims (6)

1. 1. The radiation scattering integrated microstrip antenna based on the artificial magnetic conductor is characterized by comprising a microstrip antenna, four first artificial magnetic conductor AMC arrays and four second AMC arrays, wherein the microstrip antenna is positioned in the center, and the four first AMC arrays and the four second AMC arrays are distributed on the periphery and are distributed in a chessboard structure mode; the microstrip antenna comprises a radiation microstrip patch, an antenna medium substrate, a grounding plate and a feed structure, wherein the radiation microstrip patch is positioned at the center of the upper surface of the antenna medium substrate, and the grounding plate is positioned on the lower surface of the antenna medium substrate; The first AMC array is a first AMC unit which is 4 multiplied by 4 and is closely attached to and arranged, the first AMC unit comprises a first medium substrate, a first metal pattern printed on the upper surface of the first medium substrate and a first metal ground positioned on the lower surface of the first medium substrate, the first metal pattern is in a 180-degree rotationally symmetrical structure and comprises four circular patches, the four circular patches are divided into two groups with different radiuses, and the four circular patches are positioned on a +/-45-degree diagonal line of the upper surface of the square first medium substrate; The second AMC array is a 4 multiplied by 4 second AMC unit closely attached and arranged, and comprises a second dielectric substrate, a second metal pattern printed on the upper surface of the second dielectric substrate and a second metal ground positioned on the lower surface of the second dielectric substrate, wherein the first metal pattern is in a 90-degree rotationally symmetrical structure and is in a cross-shaped annular patch structure; The antenna dielectric substrate, the first dielectric substrate and the second dielectric substrate form a complete dielectric substrate, and the grounding plate, the first metal ground and the second metal ground form a complete metal floor.
2. 2. The radiation scattering integrated microstrip antenna based on artificial magnetic conductor according to claim 1, wherein the combined simulation of the structural dimensions of two AMC units is performed by using full-wave electromagnetic simulation software CST, VBA and genetic algorithm, and the process is: step 1, utilizing a VBA script environment built in a CST, establishing a function library for controlling CST operation in a Matlab, and then calling a function in the Matlab to realize parameterized modeling, automatic simulation and phase result export of two AMC units; Step 2, by utilizing a genetic algorithm, the phase difference of two AMC units in the fitness function is larger than 143 degrees and smaller than 217 degrees in the range of 9GHz-17GHz by optimizing the structural sizes of the two AMC units, and can be satisfied under TE and TM polarization; And 3, saving the optimized structural size parameters of the two AMC units and performing simulation verification.
3. 3. The integrated radiation scattering microstrip antenna based on artificial magnetic conductor according to claim 2, wherein both AMC units are of periodic structure, and the solution is performed in the CST type using Floquet mode.
4. 4. The integrated microstrip antenna based on radiation scattering of artificial magnetic conductor according to claim 1, wherein the period P is less than or equal to λ/(1+sin (θ)), θ being an incident angle of electromagnetic wave, and λ being a wavelength.
5. 5. The integrated microstrip antenna of radiation scattering based on artificial magnetic conductor according to claim 2, wherein the reflected radiation value of the two AMC units is above 0.82 at different angles of incidence of 0-30 °.
6. 6. The integrated microstrip antenna of claim 1, wherein the antenna dielectric substrate, the first dielectric substrate and the second dielectric substrate are FR-4 (lossy) with a relative permittivity of 4.3 and a loss tangent of 0.025.

Description

Radiation scattering integrated microstrip antenna based on artificial magnetic conductor Technical Field The invention belongs to the technical field of microwave antennas, and particularly relates to a radiation scattering integrated microstrip antenna based on an artificial magnetic conductor. Background The radar system realizes remote detection by capturing electromagnetic echoes reflected by a target, and the core of the stealth technology is to effectively inhibit the intensity of echo signals. Radar Cross Section (RCS) is a key physical parameter that measures the strength of scattering ability of a target. Microstrip antennas are widely used in modern military equipment such as aircrafts, missiles, etc. due to their advantages of low profile, low manufacturing cost, easy processing and conformal surface with carriers. With the increasing maturity of low detectable profile designs and the application of high performance radar absorbing materials, the RCS of aircraft bodies has fallen to lower levels and antenna systems have therefore become a major contributor to overall electromagnetic scattering. The research on the RCS reduction technology aiming at the antenna itself has become an important direction for improving the comprehensive stealth performance of the platform. However, antennas have both radiation and scattering characteristics. Conventional RCS suppression means, such as coating with a wave-absorbing material or shape masking, often come at the expense of the radiation efficiency, pattern characteristics, or operating bandwidth of the antenna. Thus, the core challenge faced by current stealth antenna designs is how to effectively reduce their in-band and out-of-band RCS while substantially maintaining or even optimizing antenna radiation performance. In order to solve the contradiction, a new method and a new structure capable of cooperatively optimizing radiation and scattering performance are developed through continuous technical innovation, so that the development of a next-generation antenna system with high performance and truly realizing stealth is promoted. Under the same radar wave irradiation condition, the reflection characteristics of the Artificial Magnetic Conductor (AMC) and the ideal electric conductor (PEC) show complementary relation, wherein the AMC generates a reflection wave with the phase of 0 DEG, the PEC generates a reflection wave with the phase of 180 DEG, and the reflection amplitude of the two reflection waves is 1. Based on the characteristic, the two materials are alternately arranged according to a checkerboard mode, and the characteristic that the phases of reflected waves are opposite can be utilized to realize mutual cancellation of far-field scattering energy, so that the RCS of the target is reduced. With the development of AMC design theory, researchers have been able to achieve precise regulation of the unit reflection phase. The current solution is no longer limited to PEC/AMC combinations, but two AMC units with a reflection phase difference of 180 ° can be arranged in a checkerboard structure. The design can form a phase cancellation effect in the normal direction, has functions similar to those of the wave absorbing material, but has better comprehensive performance in the aspect of reducing the RCS of the antenna, so that the structural integrity of the antenna is maintained, and the negative influence of the traditional wave absorbing material on the radiation performance is avoided. However, the conventional AMC design process needs a lot of simulation, then calculates the phase difference, and the phase result has uncertainty and is complex. The prior art 'A Low RCS microstrip antenna based on chessboard AMC structure in Ku-band' discloses a microstrip antenna based on artificial magnetic conductor reduced in Ku band RCS, which has narrower reduced bandwidth and does not describe specific optimization design process. In the prior art, the design optimization process lacks specific description, and the reduction of more than 5dB is realized at 8.6GHz-18.2GHz, so that the reduction value is smaller. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a radiation scattering integrated microstrip antenna based on an artificial magnetic conductor, which relates to a specific unit optimization design process, has no deterioration of bandwidth and gain of the antenna, has a reduction value of more than 8dB at 8.7-19.6GHz, and has an average RCS reduction value of 14.3dB at 8GHz-18 GHz. The technical problems proposed by the invention are solved as follows: The radiation scattering integrated microstrip antenna based on the artificial magnetic conductor comprises a microstrip antenna, four first artificial magnetic conductor AMC arrays and four second AMC arrays, wherein the microstrip antenna is positioned in the center, and the four first AMC arrays and the four second AMC arrays are distributed on the