A Negative Group Delay Microwave Circuit Based on Signal Interference Techniques

Wang, Zhongbao; Cao, Yuan; Shao, Te; Fang, Shaojun; Liu, Yuanan

doi:10.1109/lmwc.2018.2811254

Cited by 71 publications

(85 citation statements)

References 11 publications

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“…Although signal attenuation of work Reference 16 is smaller, the proposed NGD circuit provides the widest NGD bandwidth and magnitude flatness compared with the state of the art. 4,17,18 In addition, the magnitude of |S 11 | is very poor (< 0.2 dB) in case of Reference 18 as depicted in Figure 4B therefore, this circuit is not suitable for integrating with other circuits in practical applications.…”

Section: Circuit Implementationmentioning

confidence: 99%

“…Recently, signal interference technique has been adopted to realize NGD circuit. 17,18 In Reference 17, unequal power divider/combiner and coupled-line phase shifter are utilized to generate NGD, however, circuit can only grant narrow NGD bandwidth (group delay <0) as well as group delay (GD) and magnitude flatness bandwidth. Similarly, two transmission lines along with resistors arranged in parallel creating two paths have been used to generate NGD in Reference [18], which has poor return losses.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Circuit Implementationmentioning

confidence: 99%

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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“…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%

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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“…The conventional NGDCs are usually implemented by RLC resonators [6][7][8][9][10]. 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.…”

Section: Introductionmentioning

confidence: 99%

A Compact Dual-Band Negative Group Delay Microwave Circuit

Shao¹,

Fang²,

Wang³

et al. 2018

RADIOENGINEERING

110

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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.

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A Negative Group Delay Microwave Circuit Based on Signal Interference Techniques

Cited by 71 publications

References 11 publications

Arbitrary terminated negative group delay circuit using signal interference concept

Arbitrary terminated negative group delay circuit using signal interference concept

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

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