A compact angularly‐stable frequency selective surface for GSM 900/1800‐MHz shielding using cascaded 2.5‐dimension structure

Abstract

In this article, a novel compact dual-band frequency selective surface (FSS) with stable response is proposed for GSM shielding. This FSS is designed using 2-layer cascaded 2.5-dimension structure of which element is composed of two via-based modified swastika unit cells. The proposed structure has created two stop bands around frequency 900 and 1800 MHz, respectively, with maximum attenuation value close to 70 dB. Besides, this FSS performs an excellent miniaturization characteristic with overall size of 0.048λ 0 × 0.048λ 0 , where the λ 0 represents the free space wavelength of the lower resonance frequency. More important, this FSS exhibits a very stable frequency response up to 80 for TE and TM polarization. To understand the structure better, the design procedure of this FSS is introduced in detail. Since the proposed FSS has an excellent comprehensive performance, this FSS has great potential in shielding GSM signal for small electronic devices. Finally, a prototype of proposed FSS is fabricated and measured. The measurement results prove the validity of simulation results. K E Y W O R D Sfrequency selective surfaces (FSSs), angular stability, dual-band filters, GSM shielding, 2.5-D structure

Miniaturized dual stop band frequency selective surface with broadband linear co to cross polarization conversion ability

“…Performances of the proposed dual stopband FSS is compared with recent state-of-the-art works as presented in Table 1. The proposed FSS shows lower frequency ratio in compare with 17,25,26,28,30,33 and for the remaining work frequency ratio is comparable except. 32 Moreover, angular stability is also better than the Reference 32,33.…”

“…Also the proposed FSS exhibits lower unit cell periodicity than. 25,32,33 Although unit cells in 17,[28][29][30] have miniaturized dimension but those geometries incur more design and fabrication complexity due to either convoluted pattern or dual layer metal via loaded configuration. These two reasons restrain the ease of tuning the filter response at different frequency band.…”

“…Different miniaturized FSS unit cells are reported that allow stable filter response at high oblique incident angles and also shift the grating lobes away from the operating band towards high frequency. [13][14][15][16][17][18][19][20] Unit cell size can be reduced to a fraction of wavelength using methods like lumped reactive element loading, 13 convoluted geometry [14][15][16] or 2.5D multilayer via loaded configuration. [17][18][19] Miniaturized FSS with periodic metal patches and wire mesh grids as nonresonant constituent elements for single passband first order 20 and high order 21 filter resonances are realized.…”

“…[13][14][15][16][17][18][19][20] Unit cell size can be reduced to a fraction of wavelength using methods like lumped reactive element loading, 13 convoluted geometry [14][15][16] or 2.5D multilayer via loaded configuration. [17][18][19] Miniaturized FSS with periodic metal patches and wire mesh grids as nonresonant constituent elements for single passband first order 20 and high order 21 filter resonances are realized. Instead of single passband or stopband, FSS with multiple resonances is preferred for multifunctional situation [22][23][24][25][26][27][28][29][30][31][32][33] Single and multilayer based dual band passband FSS with first order 22,23 and third order 24 filter responses are proposed in recent years.…”

Design of a triple band notched polarization independent compact FSS at UWB frequency range

“…Some other applications where FSS is intensively used are absorbers, antenna reflectors, radomes to reduce radar cross-section, polarizer, beam switching and antenna performance enhancement. [6][7][8][9][10] Owing to the space constraint in practical applications, compact FSS are required to incorporate large number of unit cells in a particular area to strongly resemble an ideal filtering behavior. 11 Further, the rapid development of multi-functional devices has led to great demand for FSSs with multi-band performances, in particular, where the bands are closely located.…”