Analysis And Design Of Frequency Selection Surface Based On Equivalent Circuit

The traditional design methods of Frequency Selective Surface(FSS)depend more on the designers' experience and their multiple attempts of full wave simulation.According to the equivalent circuit of FSS,this article will explore an effective design method of FSS,combining lumped inductors,lumped capacitors,interdigital capacitors,meander line inductors and other construction cycle units.Specific content is as follows.1.FSS design based on lumped inductance and capacitanceBased on the equivalent circuit of single-frequency and double-frequency FSS,and the use of lumped inductance and capacitance to build FSS unit,this author completes the design,processing and test of the single-frequency FSS with resonant frequency of 4.37 GHz and the double-frequency FSS with resonant frequencies of 2.5 GHz and 5.25 GHz.The cell sizes of these two kinds of FSS respectively are 1/14 wavelength and 1/12 wavelength,with good polarization and tilt angle stability.2.FSS design based on quasi-lumped inductance and capacitanceWhen lumped inductance and capacitance loads FSS,it needs welding and is of high cost.In order to solve this problem,this author bases the design on the equivalent circuit of single-frequency and double-frequency FSS,uses the interdigital capacitor and meander line inductor to build a full-plane FSS resonant unit,and completes the design,processing and test of double-frequency FSS with resonant frequencies of 2.6GHz and 5GHz.The test results are consistent with the simulation results.3.FSS absorber design research based on equivalent circuitThe working principle and equivalent circuit of FSS absorber are studied.The lumped patch resistance is used to do design research on absorber of 8-20 GHz waveband,and good bandwidth and absorption property are obtained.The unit size is 1/12 wavelength and the reflection coefficient of 8-20 GHz waveband is less than-10 db.