Characterization of the koch fractal hexagonal loop frequency selective surface for X-band application

<p>This paper presented the bandstop Koch fractal hexagonal loop frequency selective surface (FSS) for the X-band application. The simulated transmission coefficient response (S_21) had been obtained by using CST software. The proposed Koch fractal hexagonal loop FSS structure is highly insensitive towards angular stability and also incident polarization up to 60 degree , with deviation of resonant frequency, f_r below than 1%. The parametric analysis on the effect of the periodicity, width, and height of the fractal FSS structure on the S_21 has been illustrated and discussed thoroughly.</p>

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C-Band and X-Band Switchable Frequency-Selective Surface

Electronics ◽

10.3390/electronics10040476 ◽

2021 ◽

Vol 10 (4) ◽

pp. 476

Author(s):

Umer Farooq ◽

Adnan Iftikhar ◽

Muhammad Farhan Shafique ◽

Muhammad Saeed Khan ◽

Adnan Fida ◽

...

Keyword(s):

Bottom Layer ◽

Frequency Selective Surface ◽

Transverse Magnetic ◽

Unit Element ◽

Angular Stability ◽

Band Spectrum ◽

Pin Diode ◽

Pin Diodes ◽

X Band ◽

Frequency Selective

This paper presents a highly compact frequency-selective surface (FSS) that has the potential to switch between the X-band (8 GHz–12 GHz) and C-band (4 GHz–8 GHz) for RF shielding applications. The proposed FSS is composed of a square conducting loop with inward-extended arms loaded with curved extensions. The symmetric geometry allows the RF shield to perform equally for transverse electric (TE), transverse magnetic (TM), and 45° polarizations. The unit cell has a dimension of 0.176 λ0 and has excellent angular stability up to 60°. The resonance mechanism was investigated using equivalent circuit models of the shield. The design of the unit element allowed incorporation of PIN diodes between adjacent elements for switching to a lower C-band spectrum at 6.6 GHz. The biasing network is on the bottom layer of the substrate to avoid effects on the shielding performance. A PIN diode configuration for the switching operation was also proposed. In simulations, the PIN diode model was incorporated to observe the switchable operation. Two prototypes were fabricated, and the switchable operation was demonstrated by etching copper strips on one fabricated prototype between adjacent unit cells (in lieu of PIN diodes) as a proof of the design prototypes. Comparisons among the results confirmed that the design offers high angular stability and excellent performance in both bands.

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Miniaturized frequency selective surface with high angular stability

Frequenz ◽

10.1515/freq-2021-0116 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Zain Ul Abidin ◽

Qunsheng Cao ◽

Gulab Shah ◽

Zaheer Ahmed Dayo ◽

Muhammad Ejaz

Keyword(s):

Resonant Frequency ◽

Electric Field Distribution ◽

Equivalent Circuit Model ◽

Surface Current ◽

Frequency Selective Surface ◽

Angular Stability ◽

Working Mechanism ◽

Low Profile ◽

Simple Geometry ◽

Frequency Selective

Abstract In this paper, a miniaturized bandstop frequency selective surface (FSS) with high angular stability is presented. Each FSS element consists of four sets each consisting eight octagonal concentric interconnected loops. The four sets are connected with each other through outermost octagonal loop. The unit size is miniaturized to 0.066 λ0 at the resonant frequency of 1.79 GHz. The proposed configuration achieves excellent angular stability (only 0.025 GHz resonant frequency deviation is observed upto 83° oblique angles). The working mechanism of FSS is explained with the help of equivalent circuit model (ECM), electric field distribution, and corresponding surface current distribution. A prototype of the designed bandstop FSS is fabricated to verify the simulated frequency response. The experimental results are consistent with the simulation results. Simple geometry, low profile, high angular stability, and compact cell size are prominent features of the proposed structure.

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Dual-Band Band-Pass Frequency Selective Surface Based on the Matryoshka Geometry with Angular Stability and Polarization Independence

2020 14th European Conference on Antennas and Propagation (EuCAP) ◽

10.23919/eucap48036.2020.9135542 ◽

2020 ◽

Author(s):

Alfredo Gomes Neto ◽

Jefferson Costa e Silva ◽

Alexandre Jean Rene Serres ◽

Marina de Oliveira Alencar ◽

Ianes Barbosa Grecia Coutinho ◽

...

Keyword(s):

Frequency Selective Surface ◽

Angular Stability ◽

Dual Band ◽

Band Pass ◽

Frequency Selective

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Design of a Novel Miniaturized Frequency Selective Surface Based on 2.5-Dimensional Jerusalem Cross for 5G Applications

Wireless Communications and Mobile Computing ◽

10.1155/2018/3485208 ◽

2018 ◽

Vol 2018 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Peng Zhao ◽

Yihang Zhang ◽

Rongrong Sun ◽

Wen-Sheng Zhao ◽

Yue Hu ◽

...

Keyword(s):

Resonant Frequency ◽

Equivalent Circuit ◽

Equivalent Circuit Model ◽

Frequency Selective Surface ◽

Size Reduction ◽

Two Dimensional ◽

Physical Insight ◽

Frequency Selective ◽

Significant Size ◽

Insight Into

A compact frequency selective surface (FSS) for 5G applications has been designed based on 2.5-dimensional Jerusalem cross. The proposed element consists of two main parts: the successive segments of the metal traces placed alternately on the two surfaces of the substrate and the vertical vias connecting traces. Compared with previous published two-dimensional miniaturized elements, the transmission curves indicate a significant size reduction (1/26 wavelengths at the resonant frequency) and exhibit good angular and polarization stabilities. Furthermore, a general equivalent circuit model is established to provide direct physical insight into the operating principle of this FSS. A prototype of the proposed FSS has been fabricated and measured, and the results validate this design.

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