A Compact Transmission-Line Self-Matched Negative Group Delay Microwave Circuit

Shao, Te; Wang, Zhongbao; Fang, Shaojun; Fu, Shiqiang

doi:10.1109/access.2017.2761890

Cited by 51 publications

(78 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to the established theory and validation results, it would be necessary to situate the achievement of the presented li prototype compared to the published NGD circuits in the literature. Therefore, comparative study between the notable performances of the NGD li topology under investigation and the existing ones available in the literature [26], [31]- [35] are indicated here below in Table 4.…”

Section: Discussion On Ngd Performancesmentioning

confidence: 99%

Negative Group Delay Theory on Li Topology

Ravelo

Wan

et al. 2020

IEEE Access

View full text Add to dashboard Cite

This paper investigates an innovative negative group delay (NGD) theory of ''li'' geometrical shape topology. The li-topology is an outstandingly simple and fully distributed circuit comprised of a coupled line (CL). The li S-parameter model taking into account the CL coupling coefficient, delay and attenuation is established. The NGD analysis showing the possibility to generate NGD condition with respect to the li topology parameters is developed. The NGD characteristics as NGD value, center frequency, bandwidth, transmission and reflection coefficient are expressed. The li-NGD theory is validated with two proofs-of-concept implemented in microstrip technology. Calculated models, simulations and measurements are in good correlation. As expected, bandpass NGD presenting center frequency at approximately 2.56 GHz and 0.92 GHz with NGD level of approximately −0.9 ns and −3.7 ns were realized with the small and large li prototypes. Outstanding time-domain analyses explaining the bandpass NGD meaning, with innovatively low attenuation output, were also presented. The time-domain results highlight li-output pulse signal envelopes in time advance without violating the causality. INDEX TERMS Distributed circuit, li-topology, microwave theory, negative group delay (NGD), S-matrix modelling.

show abstract

Section: Discussion On Ngd Performancesmentioning

confidence: 99%

Negative Group Delay Theory on Li Topology

Ravelo

Wan

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Despite these initiative applications, further research work for understanding and interpretation of the NGD function is necessary. It was emphasized that the NGD function can be generated with various aspects as the NRI metamaterials [10][11], interference technique [23][24], active resonator-based distributed circuits [25], microwave transversal filter approach [26], and microstrip circuits [27][28][29][30]. Mostly research work on the NGD circuit design in last decade was essentially focused on the low-loss and compact passive circuits [8-9, 20-24, 27-30].…”

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%

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

View full text Add to dashboard Cite

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.

show abstract

“…In recent years, some new methods to obtain the NGD effect have been presented, such as feedback loop technique [11], [12], finite unloaded qualityfactor resonators [13], and signal interference techniques [14]. In addition, to obtain port matching without external matching networks, matched NGDCs using the coupled line doublet structure [15] and self-matched NGDCs [16] have been discussed. However, all of these NGDCs only operate in one frequency band.…”

Section: Introductionmentioning

confidence: 99%

A Compact Dual-Band Negative Group Delay Microwave Circuit

Shao¹,

Fang²,

Wang³

et al. 2018

RADIOENGINEERING

110

View full text Add to dashboard Cite

A compact dual-band negative group delay circuit (NGDC) is proposed. The proposed NGDC is composed of an open-circuited transmission line and two resistors connected by two transmission lines. The frequency ratio is controlled by the characteristic impedance of the transmission lines. To verify the design concept, a dualband NGDC with the frequency ratio of n = 2 (Circuit A) and a broadband NGDC with n = 1.16 (Circuit B) are designed and fabricated. The measured group delay value of the Circuit A is-1.19 ns at the center frequencies of lower and upper bands. And the measured NGD bandwidth is 34.6% for the lower band and 16.5% for the upper band, in which the return loss and insertion loss are better than 16.9 dB and 18.2 dB, respectively. From the measurement results of Circuit B, a flat fractional NGD bandwidth of 19.8% with GD of (-1.58 ± 0.13) ns is obtained, in which the return loss and insertion loss are better than 23 dB and 32.5 dB, respectively.

show abstract

A Compact Transmission-Line Self-Matched Negative Group Delay Microwave Circuit

Cited by 51 publications

References 21 publications

Negative Group Delay Theory on Li Topology

Negative Group Delay Theory on Li Topology

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

A Compact Dual-Band Negative Group Delay Microwave Circuit

Contact Info

Product

Resources

About