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Research On Array Synthesis And Control Of Antenna Radar Cross Section

Posted on:2015-12-29Degree:DoctorType:Dissertation
Country:ChinaCandidate:F W WangFull Text:PDF
GTID:1108330482453163Subject:Electromagnetic field and microwave technology
Abstract/Summary:PDF Full Text Request
With the detection and stealth technology developing rapidly, modern detected equipment and weapons systems into the intelligent era, its accuracy and strength more and more increasing, the survival and combat capability of traditional weapon suffered serious threat. The radar cross section(RCS) reduction has been a serious problem in military applications. Meanwhile, more and more attention has been paid to antenna scattering since it is the main contribution to the total radar cross section(RCS) of low observable platforms. Therefore, effectively control the antenna RCS and reasonably relieve the contradictions between the radiation demands and the scattering requirements have great guiding significance for the stealth design of a target. Being associated with the research project, this dissertation is mainly concerned with the antenna RCS analysis and control methods, the author’s major contributions are outlined as follows:1. In the optimization process, the differential evolution(DE) algorithm and particle swarm optimization(PSO) algorithm are investigated. The secondary development of HFSS software is proposed and used to the MIMO antenna optimization. To achieve the antenna RCS control. To improve the design efficiency of the antenna array, this dissertation discusses the space mapping(SM) method, and combines the implicit space mapping(ISM) strategy with particle swarm optimization algorithm. At last, the optimization speed and calculation accuracy are improved together.2. The radar absorbing structure is analyzed. Some RASs has been designed. We concentrate on reducing the in-band RCS of patch array antenna with a special RAS. The RAS mainly consists of two parts, square patch and lumped resistances. The simulated and measured results show that the radiation performance of the array antenna is preserved when RAS is used. At operating frequency, the RCS of array antenna with RAS has been considerably reduced. A novel method of microstrip antenna RCS reduction is proposed by hold the basic antenna sturcture and the profile.3. Defected ground sturcture is introduced, the RCSSR dual-band DGS has been designed. This dual-band DGS structure consists of two rectangular codirectional split rings resonator and locates between two patches, the parameters of the DGS is analyzed, and the dimension of each ring controls the corresponding resonant frequency. A novel method to improve the mutual coupling on the operation of a dual-band antenna is proposed.4. For resolving the RCS reduction of the wideband antenna on currently. A novel wideband radar absorbing materials(RAM) with frequency selective surfaces(FSS) is proposed. The wideband RAM is integrated as the ground plane of antenna for the in-band RCS reduction. Due to the selective reflection and resonant cancellation of FSS, the wideband absorption of multilayer RAM can be obtained. The simulated and measured results show that the radiation performance of antennas has preserved when the wideband RAM is used. The RCS of the antenna with RAM ground plane has been considerably reduced at operating band.5. Many of existing methods could reduce the RCS of antenna well when the incident wave is perpendicular to antenna, the maximum angle rang is less than ±45°. In actual application, oblique incidence even the incident wave is parallel to antenna emerges sometimes. It is hard to reduce the RCS of antenna under the condition of oblique incidence by conventional methods or materials. For these reasons, the properties of Left-handed material(LHM) have been researched, which is a promising way to solve this kind of problem. The RCS reduction theory based on LHM, and the two steps for analyzing the theory have been propoesd.6. Under the RCS reduction theory based on LHM, two applications for RCS reduction of micostrip antenna by LHM have been presented. Aim at the problem of the antenna profile increasing, a low-profile superstrate is designed. The simulated and experimental results show that, 5dB-20 dB RCS reduction under the condition of oblique incidence is obtained when LHM superstrate is used. The RCS reduction angle range can be changed by adjusting the profile of the LHM superstrate.
Keywords/Search Tags:Reduction of radar cross section, Differential evolution algorithm, Space mapping, Array synthesis, Microstrip antenna, Radar absorbing structure, Defected ground structure, Wideband radar absorbing material, Left-Handed material, Superstrate
PDF Full Text Request
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