An equivalent circuit model for predicting the frequency response of a square ring slot frequency selective surface (SRS-FSS) for normal incidence is described. The proposed FSS consists of an array of square patches centered within a wire grid. The presented circuit model is formed by the impedance of the wire grid that is parallel with the impedance of the patch array, also the mutual couplin...

This paper deals with the theoretical investigation on a reduced sized Frequency Selective Surface (FSS). The FSS is designed by cutting a unique shaped slot into square patch. It has been shown, how the variation of the dimension of the slot and periodicity results in shifting of resonant frequency . Compared to conventional square patch FSS the designed FSS can provide reduction in resonant f...

In this paper, fractal FSS has been designed using recursive technology and this frequency selective surface (FSS) acts like a multi band-reject filter. The proposed design has been investigated theoretically using Ansoft Designer® software in which the reflection and transmission band has been predicted by the method known as Method of Moment. In comparison to the reference square patched Freq...

This paper deals with theoretical investigation on a compact frequency selective surface with multiple resonant frequencies. In this paper the FSS is designed by modifying square patch nearly similar as ‘H’ shaped patch and then cutting hexagon shaped slot within it. 94.93% size reduction is achieved in this design. Three resonant frequencies have been obtained in this design. Theoretical inves...

─ In this study, we present an UltraWideband (UWB) monopole antenna with bandnotched function. The proposed antenna is fed by a microstrip line. By using two modified forkshaped slots in the ground plane, bandwidth is increased that provides a wide usable fractional bandwidth of more than 135% (2.82-15.63). In order to achieve band-rejected performance, a cross-ring slot was inserted at the squ...

This paper deals with the theoretical investigation on size reduction and wideband operation of Frequency Selective Surface (FSS). The modified FSS has an excellent angular stability performance. The compactness has been achieved by etching out unique types of slot from Square shaped patch. Gradually the dimensions of the slots are modified. At last, in Proposed FSS the size reduction is achiev...