Submillimeter Wave Frequency Selective Surface With Polarization Independent Spectral Responses

A Simple Synthesis Technique of Single-Square-Loop Frequency Selective Surface

“…From Figure 3, it is revealed that at every incidence angle used in this calculation, except for θ = 0 • , the SSLFSS resonates between 3 to 3.5 GHz and it shows the convergence of the result. In the case of θ = 0 • , the resonance occurs at 2.87 GHz which is lower than the intended frequency (3 GHz) as it does not satisfy Equation (12). Further, from Figure 3, it is observed that with different value of the incident angle, the periodicity of the FSS, dimension of the loop and the width of the loop changes and it causes the shift in the resonance frequency and its bandwidth also.…”

“…From Figures 2(a), (b) and (c), it is seen that the maximum relative error between intended and achieved operating frequency is about 10% which can be further reduced by reducing the value of θ in Equation (12). When this value is set equal to zero, the value of p is equal to λ and Equation (12) is not satisfied which calls for the addition of the correction factor in the Marcuvitz Equation [16].…”

“…For example, when we need the S 11 = 10% at 3 GHz, it indicates that the FSS corresponding to the resonance of 30 GHz to be designed as 3 GHz must be scaled up by 3 GHz/0.1. Further, to maintain the linearity of the curve, we select the design parameter as shown in the last row of Table 4 as the value at 3 GHz that is θ = 90 • and p = 0.5λ from Equation (12). On this way, to achieve 10% reflection at 3 GHz, SSLFSS must be designed to resonate at 30 GHz.…”

“…It is noted that the square loop FSS (SLFSS) offers the better performance in terms of angular stability, cross polarization, bandwidth and band separation [1]. Due to these unique properties, single square loop frequency selective surface (SSLFSS) and double square loop frequency selective surface (DSLFSS) have been investigated by several researchers [10][11][12][13]. Moreover, to analyze the FSS, various numerical techniques have been developed where each one is associated with its own merits and demerits [14].…”

Low-Pass FSS for 50–230 GHz Quasi-Optical Demultiplexing for the MetOp Second-Generation Microwave Sounder Instrument

“…In previously published work, several different low-pass, polarization independent, slot FSS suitable for use in Earth observation instrumentation have been reported [9,10]. These structures were designed to meet the conflicting requirements of low-loss and fast spectral rolloff above resonance [11], to provide signal separation of two closely spaced narrow band frequency channels.…”