Fractal-based triangular bandpass filter with a notched band for interference rejection in wideband applications

Karthie, S.; Salivahanan, S.

doi:10.1108/cw-06-2018-0045

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The transmission response over the passband is achieved by increasing the inductance value of Lvia. The designed SIW bandpass filter exhibits steep rejection skirts at the upper side frequency range with reduced spur level (Karthie and Salivahanan, 2019). The transmission response of the equivalent circuit model is presented in Figure 14.…”

Section: Analysis Of Dual-mode Substrate-integrated Waveguide Bandpass Filter For Three Stagesmentioning

confidence: 99%

Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Sandhya

Ali

Chenniappan

2020

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Purpose This paper aims to design a dual mode X-band substrate integrated waveguide (SIW) bandpass filter in the conventional SIW structure. A pair of back-to-back square and split ring resonator is introduced in the single-layer SIW bandpass filter. The various coupling configurations of SIW bandpass filter using split square ring slot resonator is designed to obtain dual resonant mode in the passband. It is shown that the measured results agree with the simulated results to meet compact size, lower the transmission coefficient, better reflection coefficient, sharp sideband rejection and minimal group delay. Design/methodology/approach A spurious suppression of wideband response is suppressed using an open stub in the transmission line. The width and length of the stub are tuned to suppress the wideband spurs in the stopband. The measured 3 dB bandwidth is from 8.76 to 14.24 GHz with a fractional bandwidth of 48.04% at a center frequency of 11.63 GHz, 12.59 GHz. The structure is analyzed using the equivalent circuit model, and the simulated analysis is based on an advanced design system software. Findings This paper discusses the characteristics of resonator below the waveguide cut-off frequency with their working principles and applications. Considering the difficulties in combining the resonators with a metallic waveguide, a new guided wave structure – the SIW is designed, which is synthesized on a planar substrate with linear periodic arrays of metallized via based on the printed circuit board. Originality/value This study has investigated the wave propagation problem of the SIW loaded by square ring slot-loaded resonator. The electric dipole nature of the resonator has been used to achieve a forward passband in a waveguide environment. The proposed filters have numerous advantages such as high-quality factor, low insertion loss, easy to integrate with the other planar circuits and, most importantly, compact size.

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Section: Analysis Of Dual-mode Substrate-integrated Waveguide Bandpass Filter For Three Stagesmentioning

confidence: 99%

Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Sandhya

Ali

Chenniappan

2020

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“…In recent years, compact BPFs are built with the help of coupled lines along with other structures (Li and Xu, 2021; Sangam et al , 2021; Xu et al , 2022; Shi et al , 2022). Fractal-based BPF with interference rejection (Karthie and Salivahanan, 2019) was designed, fabricated and tested. From the survey, BPFs were also built by hairpin line resonators in (Naser-Moghadasi et al , 2011; Tunc et al , 2011).…”

Section: Introductionmentioning

confidence: 99%

Quasi-elliptic band pass filter using resonators based on coupling theory for ultra-wide band applications

M.,

Inabathini

2024

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Purpose This paper aims to present the simulation, fabrication and testing of a novel ultra-wide band (UWB) band-pass filters (BPFs) with better transmission and rejection characteristics on a low-loss Taconic substrate and analyze using the coupled theory of resonators for UWB range covering L, S, C and X bands for radars, global positioning system (GPS) and satellite communication applications. Design/methodology/approach The filter is designed with a bent coupled transmission line on the top copper layer. Defected ground structures (DGSs) like complementary split ring resonators (CSRRs), V-shaped resonators, rectangular slots and quad circle slots (positioned inwards and outwards) are etched in the ground layer of the filter. The circular orientation of V-shaped resonators adds compactness when linearly placed. By arranging the quad circle slots outwards and inwards at the corner and core of the ground plane, respectively, two filters (Filters I and II) are designed, fabricated and measured. These two filters feature a quasi-elliptic response with transmission zeros (TZs) on either side of the bandpass response, making it highly selective and reflection poles (RPs), resulting in a low-loss filter response. The transmission line model and coupled line theory are implemented to analyze the proposed filters. Findings Two filters by placing the quad circle slots outwards (Filter I) and inwards (Filter II) were designed, fabricated and tested. The fabricated model (Filter I) provides transmission with a maximum insertion loss of 2.65 dB from 1.5 GHz to 9.2 GHz. Four TZs and five RPs are observed in the frequency response. The lower and upper stopband band width (BW) of the measured Filter I are 1.2 GHz and 5.5 GHz of upper stopband BW with rejection level greater than 10 dB, respectively. Filter II (inward quad circle slots) operates from 1.4 GHz to 9.05 GHz with 1.65 dB maximum insertion loss inside the passband with four TZs and four RPs, which, in turn, enhances the filter characteristics in terms of selectivity, flatness and stopband. Moreover, 1 GHz BW of lower and upper stopbands are observed. Thus, the fabricated filters (Filters I and II) are therefore evaluated, and the outcomes show good agreement with the electromagnetic simulation response. Research limitations/implications The limitation of this work is the back radiation caused by DGS, which can be eradicated by placing the filter in the cavity and retaining its performance. Practical implications The proposed UWB BPFs with novel resonators find their role in the UWB range covering L, S, C and X bands for radars, GPS and satellite communication applications. Originality/value To the best of the authors’ knowledge, for the first time, the authors develop a compact UWB BPFs (Filters I and II) with BW greater than 7.5 GHz by combining reformed coupled lines and DGS resonators (CSRRs, V-shaped resonators [modified hairpin resonators], rectangular slots and quad circle slots [inwards and outwards]) for radars, GPS and satellite communication applications.

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“…Recently, investigation of fractals has attracted increasing attention. Fractal geometries have been introduced in the development of various devices and components, such as frequency selective surfaces (FSSs) [29], antennas [30], and bandpass filters [31]. Meanwhile, many different fractal geometries such as Cantor- [32], T- [33], Minkowski-island- [34], Koch- [35], Moore curve- [36,37], Sierpinski carpet-shaped geometry [38] have also been demonstrated to further improve the performances of such devices and components.…”

Section: Introductionmentioning

confidence: 99%

High-performance spoof surface plasmon polariton waveguides and splitters based on Greek-cross fractal units

Ye¹,

Chen²,

Zhou³

et al. 2020

J. Phys. D: Appl. Phys.

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In this paper, we introduce the fractal geometry into the spoof surface plasmon polariton (SSPP) waveguide and splitter design. We propose a novel SSPP waveguide consisting of periodic corrugated Greek-cross fractal units (GCFUs) connected to a microstrip line. The generation process of periodic corrugated GCFUs is described and the dispersion characteristics are studied. We find we can engineer the property of the waveguide at will by tuning the parameters of the GCFU. To validate the proposed design, a wideband lowpass filter based on double-sided DCFUs with ultra-sharp roll-offs is fabricated and tested. Based on this waveguide concept, we design a wideband Y-splitter including an SSPP waveguide with double-sided GCFUs and two SSPP waveguide branches with single-sided GCFUs. To improve isolations and reduce the reflections between output ports of the Y-splitter, a 100 Ω resistor is loaded in the middle of two symmetrical branches to construct Wilkinson splitter to equally and efficiently split the energy of the SSPPs into two parts. The simulated and measured results show that the SSPP splitter possesses excellent performance in a passband of 1.5–4.0 GHz with low insertion loss (S21, S31 > −4 dB), high reflection loss (S11, S22, S33 < −10 dB), and high isolation (S32 < −10 dB). This work may open up a new door for the development of various plasmonic integrated functional devices.

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Fractal-based triangular bandpass filter with a notched band for interference rejection in wideband applications

Cited by 4 publications

References 18 publications

Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Compact dual mode X-band SIW bandpass filter with wide spurious suppression using split square ring slot resonator

Quasi-elliptic band pass filter using resonators based on coupling theory for ultra-wide band applications

High-performance spoof surface plasmon polariton waveguides and splitters based on Greek-cross fractal units

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