Novel frequency selective surfaces designing by modification of Jerusalem cross slot

This research introduces an efficient method to obtain three novel frequency selective surface (FSS) slots. The method is based on the modification of Jerusalem cross (JC) slot which is called modified Jerusalem cross (MJC). The modifications of JC slot consist of the element type and geometry, the substrate and superstrate parameters, and inter-element spacing; however the FSSs have same dimension of unit cells and periodicity(Ltlambda). The array of slots which acts as a bandpass filter, were positioned normal to incidence plane wave. The array of metallic patches constitutes a capacitive surface and the inductive surface, which together act as a resonant structure in the path of an incident plane wave. The Si- parameters, resonance frequency, bandwidth and null between two adjacent resonance frequencies for each structure have been compared with the JC FSS. Three type of MJC have been designed and compared with JC slot. The result shows MJC1 has higher resonance frequency and higher bandwidth, MJC2 in the first resonance frequency works at higher resonance frequency and higher bandwidth but in second resonance frequency the bandwidth is lower and resonance frequency is higher than JC, and MJC3 has approximately same resonance frequency and higher band. This work provides new viewpoints to design novel structures for special purposes.