Absorptive Bandstop Filter With Prescribed Negative Group Delay and Bandwidth

Qiu, Liang-Feng; Wu, Lin‐Sheng; Mao, Jun‐Fa

doi:10.1109/lmwc.2017.2711572

Cited by 66 publications

(71 citation statements)

References 8 publications

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“…To alleviate the issues related to the signal delay [2,14], equalization techniques using NGD circuits were introduced [15][16][17][18]. Behind this NGD tentative application, the NGD circuits were implemented differently.…”

Section: Introductionmentioning

confidence: 99%

“…It can analytically be identified by transfer function (TF) and topological analysis that the fundamental classification of this RF and microwave NGD circuits, available in the literature, belongs to the BP NGD category [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. It can also be remarked that these diverse BP NGD circuits [17][18][19][20][21][22][23][24][25][26][27][28][29][30] operate, generally, with use of resonant RLC-networks. The theoretical approaches proposed in the most of NGD theory state that NGD center frequencies are equal to the resonance frequency.…”

Section: Introductionmentioning

confidence: 99%

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Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Ravelo

Ngoho²,

Fontgalland

et al. 2020

IEEE Access

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This paper aims to develop an original circuit theory of inductorless NGD topology. The considered passive cell comprised of resistor and capacitor elements without inductor operates as a bandpass (BP) NGD function. The specifications of NGD functions are defined. Generally, the BP NGD fully lumped circuits available in the literature operate with resonant RLC-network. In the introduced research work, a lumped circuit was first time identified to exhibit the BP behavior without the presence of inductive component. The inductorless BP NGD topology is inspired from the combination of low-pass (LP) and high-pass (HP) NGD passive cells. Therefore, an original LP-HP NGD composite topology is obtained. The identified BP NGD topology is constituted only by passive RC-networks. Then, theoretical development of BP NGD analysis is explored. The inductorless circuit theory starts with the identification of BP NGD canonical form. Then, the expressions of NGD value, center frequency and attenuation in function of RC-network parameters are established. The synthesis equations allowing to determine the resistor and capacitor elements are derived. Proofs-of-concept are designed and prototypes are fabricated to verify the effectiveness of the developed LP-HP NGD composite theory. To validate the developed original circuit theory, two prototypes of RC-network based LP-HP NGD composite were designed, fabricated, simulated and tested. The two prototypes were synthesized with respect to two different NGD center frequencies 13.5 MHz and 22 MHz. As expected, the calculated, simulated and measurement results are in very good agreement with NGD value of about some negative nanoseconds. In the future, the characterized inductorless topology enable to overcome the traditional limitations of RLC-network based BP NGD circuits because of inductance self-effect limitation. INDEX TERMS Bandpass (BP) negative group delay (NGD), Low-pass/high-pass (LP-HP) NGD composite, Circuit theory, Inductorless passive topology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Ravelo

Ngoho²,

Fontgalland

et al. 2020

IEEE Access

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“…Nevertheless, the available NGD circuit topologies are either implemented with passive complex structure or with lossy lumped elements. Therefore, the design of simpler NGD microwave circuits remains an attractive challenging research topic for NGD circuit researchers [28][29][30][31][32][33]. Acting as an unfamiliar research topic, it is always interesting to investigate more deeply the NGD circuits with any topologies.…”

Section: Introductionmentioning

confidence: 99%

“…A resistive lossy left-handed transmission line structure exhibiting NGD function was proposed in [28]. An NGD circuit built with absorptive band-stop filter was presented in [29]. To reduce the complexity and the limitation with the lossy lumped elements, a simple NGD bandpass topology comprised of fully distributed cell constituted by an open-ended microstrip stub was also proposed [31].…”

Section: Introductionmentioning

confidence: 99%

Radial stub based negative group delay circuit theory

Wan

Ravelo

2020

IET Microwaves, Antennas & Propagation

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This study addresses a negative group delay (NGD) circuit theory regarding a distributed passive topology consisted of an open‐ended radial stub. The equivalent circuit composed of the lumped R, L and C elements is proposed. Then, the S‐parameter model of the passive topology is established. The NGD analysis is described from the S‐parameter model. The synthesis method enabling to determine the stub parameters as a function of the targeted NGD level, frequency centre and reflection coefficient is formulated. The radial stub topology limit is explained with an analytical condition from the synthesis relation. The developed NGD theory feasibility is validated with two cases of proof‐of‐concept (POC). First, ideal POC circuit with NGD value varied from −2 to −1 ns around the centre frequency 1.3 GHz is confirmed with ideal optimised circuit presenting figure‐of‐merit of approximately −0.27. Then, the theoretical prediction is verified numerically and experimentally by designing and fabricating an actual microstrip radial stub circuit. The calculated model, simulation and measurements are in very good correlation. The prototype test results confirm that the NGD circuit exhibits an NGD of approximately −1.2 ns level at approximately 0.85 GHz centre frequency.

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“…The NGD characteristics have been demonstrated in various systems. In the microwave area, NGD circuits are used to compensate for group delays usually caused by the use of filters or amplifiers [3,4]. Many studies have been conducted to utilize the NGD phenomenon by employing various structures, such as a defected microstrip structure and a defected ground structure [5].…”

Section: Introductionmentioning

confidence: 99%

Design Method for Negative Group Delay Circuits Based on Relations among Signal Attenuation, Group Delay, and Bandwidth

Jung

Lee

2019

J Electromagn Eng Sci

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Typical negative group delay circuits (NGDC) are analyzed in terms of signal attenuation, group delay, and bandwidth using S-parameters. By inverting these formulations, we derive and present the design equations (for NGD circuit elements) for a desired specification of the two among the three parameters. The proposed design method is validated through simulation examples for narrow-and wide-band pulse inputs in the time and frequency domains. Moreover, an NGDC composed of lumped elements is fabricated at 1 GHz for measurement. As a function of frequency, the circuit-/EM-simulated and measured group delays are in good agreement. The provided simple NGDC design equations may be useful for many applications that require compensations of some signal delays. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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Absorptive Bandstop Filter With Prescribed Negative Group Delay and Bandwidth

Cited by 66 publications

References 8 publications

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Original Theory of NGD Low Pass-High Pass Composite Function for Designing Inductorless BP NGD Lumped Circuit

Radial stub based negative group delay circuit theory

Design Method for Negative Group Delay Circuits Based on Relations among Signal Attenuation, Group Delay, and Bandwidth

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