Design and improvement high pass filters for microwave region

In the present work theoretically optimization design of wide and narrow band pass filters have beensuggested over the range (8.5-11.5) nm.) within Microwave region to use in modern optical laser system.These design based on quarterwave stack, for the numerical calculation, we used Sio2 as the substrate, Zinc oxide(Zno) and Silicon Si) as low and high refractive index respectively. For the normal incidence at the wavelengthdesign 10 nm, the results shows that the transmittance for the suggested design, (A/(HL)ZHH(LH)Z/Sio2), was(99.99 %). Also the number of order and the effect of incidence angle were investigated. The results shows that thetransmittance maximum value at Z=2 and the full width at half maximum decreases in the normal incident .whilewhen the angle of incidence increase the transmittance of Electric polarization(TE) will decreases and thetransmittance of Magntic polarization(TM) increase with shifting of wavelength design toward shorter wavelengthsof electromagnetic spectrum.