Realization of a Dual Stop Band for ‘S’ and ‘X’ Bands From the Complimentary Geometry of the Dual Pass Band (S and X Band Application) FSSs

Interference from the nearby wireless communication bands may weaken the desire frequency signals. Hence, to overcome or minimize the problem of interference from nearby wireless communication bands, a dual stop band unit cell structure of FSS that realized from the pass band geometry of FSSs, is proposed. Complimentary structure of the FSS unit cell offers transmission characteristics which are complimentary of the original transmission characteristics. For example orignal FSS unit cell have single square shaped structure that imprinted on substrate offers stop band transmission characteristics. In addition complimentary of the square loop that is square shaped slot in substrate offers pass band transmission characteristics. Therefore, the stop band transmission characteristics from pass band can be realized by simply replacing the metal elements of FSS unit cell structure by slots/aperture of the same size and geometry (i.e. complimentary of the original FSS unit cell structure). But here, it is important to mention that the resultant frequency response of the complimentary structure will not be exactly opposite to that of frequency response of original structure. Therefore, the FSS unit cell is optimized to get the desired stop band response for S and X bands.