International Journal of Infrared and Millimeter Waves

, Volume 7, Issue 2, pp 237-243

First online:

Study on the fir bandpass filters consisting of two resonant grids

  • Zhang GuangzhaoAffiliated withElectronics Department, Zhongshan University
  • , Hu JingluAffiliated withElectronics Department, Zhongshan University
  • , Zhao JinfuAffiliated withElectronics Department, Zhongshan University

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A series of interference filters composed of two resonant grids, with resonant wavelengths λm <200μm, were constructed, and the dependence of the spectral characteristics on the separation of the two grids was studied experimentally in detail. The multiple-beam interference theory was applied to analyse the experimental results. The theoretical calculations and the experimental results are in good agreement. A method is presented, by which double-grid interference filters can be designed with the computer aid.