A Compact Dual-Band Negative Group Delay Microwave Circuit

Shao, Te; Fang, Shyh‐Tirng; Wang, Z.; Liu, H.

doi:10.13164/re.2018.1070

Cited by 45 publications

(115 citation statements)

References 24 publications

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“…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%

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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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“…When dealing with coupling scenarios involving ''01O'' structures, it is of utmost importance for the EMC designer to ensure the system functioning taking into account NGD effects. Compared with the existing singleband NGD circuits [12]- [19], [21]- [23], the design of dualband NGD circuits [24]- [27] remains a challenging task. In order to enable the NGD circuit to operate in different frequency bands, few studies are focused on the design of dual-band NGD circuits.…”

Section: Introductionmentioning

confidence: 99%

0IO-Shape PCB Trace Negative Group-Delay Analysis

et al. 2020

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This paper elaborates a negative group delay (NGD) analysis of 0IO-shape printed circuit board (PCB) traces. This circuit topology is originally implemented with a tri-coupled line (3CL) six-port element with the lateral side connected through lossy transmission lines (TLs). After description of the electrical equivalent diagram, the S-matrix model is established. The group delay (GD) is formulated from the transmission coefficient as a function of the 0IO topological parameters. The effectiveness of the GD modelling is verified with a microstrip circuit proof-of-concept (POC). Simulations and measurements, which are in good agreement, confirm the dual-band bandpass NGD behavior of the 0IO POC. The fabricated prototype generates NGD levels better than −1 ns at NGD center frequencies of about 2.2 GHz and 3 GHz. In addition, to this good NGD performance, the 0IO POC operates with a low insertion loss better than 2.5 dB and reflection losses better than 12 dB in the NGD bandwidths. INDEX TERMS Microwave theory, distributed topology, negative group delay (NGD), tri-coupled line (3CL), modeling.

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“…[3][4][5][6] Since NGD occurs when signal attenuation is maximum; conventional approaches to realize NGD circuits are based on RLC resonators, which have smaller NGD bandwidth and magnitude (S 21 ) flatness. [7][8][9][10][11][12][13] To mitigate these problems, researchers have attempted to design NGD circuits using different methods such as crosscoupling between resonators, 14 increasing the number of resonators, 15 and transversal-filter topologies. 16 Except for the work in Reference 16, these NGD circuits also used resistor R for generating NGD, which prevented fully distributed circuit realization.…”

Section: Introductionmentioning

confidence: 99%

Arbitrary terminated negative group delay circuit using signal interference concept

Chaudhary

Jeong

2020

Int J RF Microw Comput Aided Eng

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In this article, we demonstrate signal interference concept based wideband negative group delay (NGD) circuit with an arbitrary termination port impedance. The proposed circuit consists of unequal power division ratio 180° hybrid and in‐phase combiner. The NGD can be generated by controlling power division ratios of 180° hybrid and combiner. For experimental verification, the circuit is designed and fabricated at a center frequency of 2 GHz. The experiment results show that the proposed NGD circuit can provide 460 MHz NGD bandwidth (bandwidth of group delay <0 ns) with group delay of −0.8 ns at 2 GHz.

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A Compact Dual-Band Negative Group Delay Microwave Circuit

Cited by 45 publications

References 24 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

0IO-Shape PCB Trace Negative Group-Delay Analysis

Arbitrary terminated negative group delay circuit using signal interference concept

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