Design Of Frequency Selective Absorber With Double-sided Absorption In Transmission Passban

Radar detection technology is still the most effective detection method because it has the advantage of maintaining excellent performance under adverse conditions.As a key component of radar system,radome’s reliability requirements also increase.Due to its integrated absorption and transmission characteristics,frequency selective rasorber(FSR)can be used in radar stealth radomes to reduce the scattering cross section of multi-static radar.The improvement and expansion of its various performances have been the focus of scholars at home and abroad in recent years.However,at present,there is little research on the frequency-selective absorber for absorbing waves on both sides of the passband.Most of the existing designs avoid the loss of the transmission passband caused by the circuit simulation absorber by designing the passband beyond a certain interval from the absorbing band.However,the transmission band and the absorbing band of the FSR obtained by such designs are not continuous,that is,there will be a reflection band between the transmission band and the absorbing band,it will cause the decline of radar stealth performance.Based on this situation,this paper proposes an FSR with both the upper and lower side frequencies of the passband to absorb waves,and completes the corresponding design on the premise that both sides of the passband absorb waves and ensure the coherence of the absorption band and the transmission band.The specific research content includes three parts:1.The method of absorbing wave on both sides of the passband by loading resonators is analyzed,and a circular resonant structure is designed.Based on this,a dual-pass FSR with absorption bands on both sides of the passband is designed.By adding a slot ring on the designed arc,two passbands can be inserted between the absorption bands at the same time,and its performance is verified by simulation.2.A miniaturized FSR with absorption bands on both sides of the passband is proposed.By placing circular resonators and square rings compactly,the size of the overall structure is reduced while increasing the passband between the absorption bands.Based on the simulation test,the real object is processed and verified by experiments,and the test results are consistent with the simulation results.3.A switchable FSR absorbing waves on both sides of the passband is proposed.By controlling the state of the PIN tube,the on-off of the passband and the absorption band between the absorption bands can be controlled.Finally,a bias feed network is designed for the PIN tube,and the performance of FSR is verified by simulation.The FSRs proposed in this paper maintain good angular stability,polarization insensitivity and other characteristics.In the last chapter,the full text is summarized.