An Asymmetric Meandered Line Based Dual-Band ENG-TL Antenna Loaded with Complementary Closed Ring Resonators for Gain Enhancement

2023

Circuit Theory & Apps

Self Cite

SummaryThis paper presents a novel, compact, and highly selective metamaterial inspired filter with low insertion loss, lowpass, and triple‐band bandpass characteristics. The presence of five transmission zeros and seven poles facilitates highly selective filtering performance. The improved impedance matching and transmission characteristics have been achieved by embedding complementary split ring resonator as defected ground structure. The filter circuit area excluding 50 Ω feed lines is merely 0.17λg × 0.05λg at 3‐dB cut‐off frequency of lowpass passband (1.11 GHz). The 3‐dB fractional bandwidths of the three bandpass regions are 39.50% (1.3–1.94 GHz), 21.20% (3.12–3.86 GHz), and 21.06% (4.04–4.99 GHz) at the center frequencies of 1.62, 3.49, and 4.51 GHz, respectively. Intended filter also offers a wide stopband extending from 2.15 to 2.96 GHz at close to 20 dB attenuation level. Further, position of transmission zeros and 3‐dB passband bandwidths can be adjusted by carefully choosing structural design parameters. The metamaterial effect of the proposed filter has been demonstrated by plotting refractive index followed by validating the performance with the help of experimental measurements. No filter shows lowpass characteristic along with three bandpass performances as found by the authors exploring literature, which presents the novelty of the proposed work.

show abstract

“…Using Bloch‐Floquet theorem, the dispersion relation of the designed filter can be obtained from Equation (3). 20

β ((), ω) d goodbreak= \cos^{- 1} ((), 1 goodbreak+ italicZY) goodbreak= \cos^{- 1} ((), A)

β ((), ω) d goodbreak= italicnπ, ((),,,,, n goodbreak= 0, goodbreak\pm 1, goodbreak\pm 2, \dots \dots \dots, goodbreak\pm ((), N goodbreak- 1)),

where n = resonant mode number and N = periodicity of the unit cell.…”

Section: Geometrical Configuration Of the Filter And Theorymentioning

confidence: 99%

A miniaturized highly selective MTM‐inspired filter for lowpass and triple‐band bandpass performance with configurable transmission zeros and bandwidth

2023

Circuit Theory & Apps

Self Cite

show abstract

“…Metamaterials (MTMs) are class of artificially engineered structures that provides negative permittivity and permeability simultaneously. Researchers have exploited these peculiar attributes to develop devices like antennas, 1,2 absorbers, 3,4 filters, 5,6 and so forth. The metamaterial absorbers (MMAs) provide hindrance to undesirable reflection and transmission of electromagnetic (EM) radiations.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of angle independent conformal tri‐band metamaterial absorber design for industrial and defense applications

Int J RF Mic Comp-Aid Eng

2022

Self Cite

In this paper, a novel ultra-thin, conformal, triple band metamaterial absorber (MMA) which provides polarization insensitivity along with wide angle stability for C, X, and Ku frequency band applications is presented. The proposed MMA comprises of the modified square ring, circular ring, and two combined identical swastik shaped structures. The calculation reveals that the suggested MMA is capable of providing triple band operations with near unity absorptions of 99.81, 99.77, and 99.68% at 5.20 GHz (C-band), 9.99 GHz (X-band), and 14.56 GHz (Ku-band), respectively. The corresponding full width at half maximum (FWHM) bandwidths are 180 MHz (5.11-5.29 GHz), 320 MHz (9.83-10.15 GHz), and 560 MHz (14.28-14.84 GHz) respectively. The intended unit-cell is very compact (0.135λ 0 Â 0.135λ 0 ) and showing ultra-thin (0.0104λ 0 ) feature.Polarization insensitivity is ensured by means of quadruple symmetry of the proposed unit cell. It is found that the absorptivity greater than 80% is maintained up to 60 for transverse electric (TE) modes and 75 for transverse magnetic (TM) modes. Therefore, it can be stated that it provides excellent wide incidence angle stability. Moreover, adoption of 0.6 mm thick substrate makes it suitable to be employable in defense applications where conformability is a crucial issue.

show abstract

An asymmetric CPW-fed ultra miniaturized epsilon negative triple-band antenna with improved gain using complimentary closed ring resonators

Journal of Electromagnetic Waves and Applications

2022