Design Theory And Technology Research Of The FSS For Ka/W Dual-band Surface Antennas

Frequency selective surface(FSS)is a two-dimensional periodic array structure.It has the characteristics of frequency-selective transmission or reflection for electromagnetic waves of different frequency bands,which is equivalent to a spatial stereo filter.With the development of science and technology,the application of FSS in the microwave,millimeter wave,infrared and visible light has been received great attention.At present,making the best of FSS with spatial filtering characteristics in practical electronic and photons systems has already become a research hotspot.In this thesis,we mainly study the application of FSS in the millimeter wave surface antenna system,design and realize the multi-frequency multiplexing of the surface antenna,which effectively improves the utilization rate of the antenna.(1)We made thorough analysis of FSS including the theory of electromagnetic transmission characteristics,main factors affecting the transmission and reflection,the grating lobe phenomenon and design method.On this basis,a new fan loop FSS and a convoluted hexagonal ring FSS were designed and studied,respectively.The simulation results show that the designed structures realize transmission in Ka-band,and reflection in W-band,and possess high stability in different conditions of the incident wave.(2)The geometric structure,working principle and general design method of the parabolic antenna and Cassegrain antenna are briefly introduced.The relevant design theory of the dual-mode conical horn antenna is given.And then we studied simulation analysis of the hyperboloid FSS in the design of Ka/W millimeter wave dual-band surface antenna.In the study,we carried out the joint simulation experiments of the designed FSS,Ka-band and W-band feed horns,and the collaborative simulation of the dual-band antenna using HFSS and HFSS-IE.The simulation results confirm the effective application of FSS in Ka/W millimeter wave surface antenna.(3)To verify the performance of the designed FSS in practical engineering,we designed and tested a Ka/W millimeter wave dual-band offset parabolic antenna.The comparison experiments show that the designed FSS has very good filtering characteristics in the Ka/W dual-band millimeter-wave parabolic antenna system and can be applied in the antenna engineering design.