Analytical modeling of H‐shape distributed topology with bandpass negative group delay behavior

Li, Ningdong; Wan, Fang; Ravelo, Blaise

doi:10.1002/mmce.22295

Cited by 4 publications

(7 citation statements)

References 27 publications

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“…By curiosity, we would like to study the design feasibility of tri-port NGD topologies with electrical interconnect circuits [28,29]. Some rare research works on multi-port LP-NGD topologies [30][31][32][33] were recently investigated. Typical three- [30,31] and four-port [31][32][33] topologies of bandpass (BP) NGD circuit were proposed.…”

Section: Introductionmentioning

confidence: 99%

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Low-Pass Negative Group Delay Modelling and Experimentation With Tri-Port Resistorless Passive Cross-Circuit

Sambatra¹,

Jaomiary²,

Ngoho³

et al. 2022

PIER M

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This paper introduces an original study of low-pass (LP) negative group delay (NGD) circuit. The family of the proposed passive network cross-topology was rarely investigated in the literature. It acts as a tri-port passive circuit presenting a cross-shaped topology. The present study of tri-port passive circuit is originally based on S-matrix modelling. The identification method of LP-NGD function type is established. The considered passive tri-port topology is innovatively constituted by a resistorless LC-passive network. Thanks to the impedance 3-D matrix modelling, the cross-circuit S-parameters are analytically expressed. Then, the NGD analysis at very low-frequencies is presented. The LP-NGD behavior existence condition of the cross-circuit in function of the L and C components is established. The relevance of the tri-port NGD circuit theory is verified by a proof-of-concept of resistorless cross-circuit. Analytical modelling, simulation, and experimentation confirmed the LP-NGD design feasibility with NGD value of about −2 ns and 6.67 MHz cut-off frequency.

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Section: Introductionmentioning

confidence: 99%

“…Some rare research works on multi-port LP-NGD topologies [30][31][32][33] were recently investigated. Typical three- [30,31] and four-port [31][32][33] topologies of bandpass (BP) NGD circuit were proposed. However, the LP-NGD circuit study with resistorless topology remains a challenging and original task.…”

Section: Introductionmentioning

confidence: 99%

Low-Pass Negative Group Delay Modelling and Experimentation With Tri-Port Resistorless Passive Cross-Circuit

Sambatra¹,

Jaomiary²,

Ngoho³

et al. 2022

PIER M

Self Cite

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“…All of these NGDCs in References [1–16] can provide only a fixed negative group delay (NGD) time and cannot satisfy the applications on tunable delay shifter 17 and reconfigurable non‐Foster elements for squint‐free beamforming networks 18 . To obtain the reconfigurable NGDCs, several circuits have been designed 19–27 .…”

Section: Introductionmentioning

confidence: 99%

“…7 However, the circuits in References [5][6][7] suffer from large signal attenuation. To reduce the loss of the signal, the NGDCs containing amplifiers, 8,9 the selfpackaged multi-layer suspended lines, 10 and the lossy transmission lines [11][12][13][14] were proposed. In References [11][12][13][14], the layout of the circuit is more flexible without lumped elements and can be designed for many different shapes.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the loss of the signal, the NGDCs containing amplifiers, 8,9 the selfpackaged multi-layer suspended lines, 10 and the lossy transmission lines [11][12][13][14] were proposed. In References [11][12][13][14], the layout of the circuit is more flexible without lumped elements and can be designed for many different shapes. Besides, the lossy NGD circuit with bandpass characteristic has been analyzed 15 and verified by a timedomain experimental test.…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable negative group delay circuit with tunable group delay flatness

Meng

Wang

Fang

2022

Int J RF Mic Comp-Aid Eng

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A reconfigurable negative group delay circuit (NGDC) with tunable group delay flatness is presented. The proposed NGDC is composed of an amplifier, three series resistors connecting with two transmission lines, two varactors, and a diode. By shorting different resistors through the diode, different negative group delay (NGD) times can be obtained. Two varactors are utilized to tune the flatness of the group delay. For verification, an NGDC is designed, fabricated, and measured at the center frequency of 1.0 GHz. The measured NGD time is tuned from −2.0 to −5.8 ns. The flat‐NGD bandwidth varies from 2.2% to 8.8% with ±8% group‐delay fluctuation. And the insertion loss varies from 6.5 to 13.8 dB.

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NGD investigation on medusa‐shape interconnect structure

Wan

Lalléchère

et al. 2021

Int J RF Microw Comput Aided Eng

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This paper explains why the electromagnetic coupling between interconnect main Ω-shape and straight I-lines of printed circuit board (PCB) can be source of bandpass (BP) negative group delay (NGD) behavior. The investigation on the NGD effect is established from an innovative microstrip circuit having medusa shape. The medusa topology analytical description is based on the equivalent circuit and S-matrix model. Then, the group delay (GD) response enabling to explain the existence of the BP NGD function is defined. As proofof-concept (POC), the influences of the medusa circuit constituting interconnect line (IL) lengths and interspaces on the BP NGD behavior are illustrated by parametric study. The NGD behavior is explained by the variations of the NGD value and NGD center frequency. More importantly, two NGD medusa prototypes were designed, fabricated, simulated and tested. The BP NGD responses of the two-medusa circuit POCs are validated by a very good agreement between the calculations, simulations and experimentations. The test results confirm that the medusa circuit POCs generate BP NGD responses with NGD level and center frequency of about À1.6 ns and 2.76 GHz respectively.

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Analytical modeling of H‐shape distributed topology with bandpass negative group delay behavior

Cited by 4 publications

References 27 publications

Low-Pass Negative Group Delay Modelling and Experimentation With Tri-Port Resistorless Passive Cross-Circuit

Low-Pass Negative Group Delay Modelling and Experimentation With Tri-Port Resistorless Passive Cross-Circuit

Reconfigurable negative group delay circuit with tunable group delay flatness

NGD investigation on medusa‐shape interconnect structure

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