A Full-Passband Linear-Phase Band-Pass Filter Equalized With Negative Group Delay Circuits

Shao, Te; Wang, Zhongbao; Fang, Shaojun; Liu, Hongmei; Chen, Zhi Ning

doi:10.1109/access.2020.2977100

Cited by 30 publications

(34 citation statements)

References 27 publications

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“…The frequency domain experimental test was realized with a VNA Rohde & Schwarz® referenced ZVA 24 working from 10 MHz to 24 GHz. The measured GD of the tested circuit was extracted from transmission parameter following equation (5). The measured results are discussed in the following paragraphs.…”

Section: ) Experimental Setup With S-parameter Measurementmentioning

confidence: 99%

“…Recent studies featured some tentative RF and microwave applications of unfamiliar negative group delay (NGD) circuits [1][2][3][4][5]. The NGD circuits are expected to be useful for the improvement of certain microwave devices as antenna [1], for the design of non-Foster reactive elements [2][3], and group delay (GD) equalization techniques [4][5]. But these NGD circuits applications are still less exploited compared to the other classical microwave circuits as filters, antennas, amplifiers and so one.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Time-Domain Study for Bandpass Negative Group Delay Analysis With Lill-Shape Microstrip Circuit

et al. 2021

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This paper focuses on the time-domain analysis of bandpass (BP) negative group delay (NGD) function. The innovative NGD investigation is based on the time-domain experimentation of an innovative topology of "lill"-shape passive microstrip circuit. The design principle of the proof of concept (POC) constituted by particular microstrip shapes is described. The NGD circuit is inspired from a recent fully distributed "li"-topology. Before the time-domain investigation, the BP NGD specifications of the circuit under study are academically defined. As practical application of the basic definition, a frequency domain validation of "lill"-circuit is presented in the first section of the paper. The POC circuit is specified by a -8 ns NGD value at 2.31 GHz NGD center frequency and a 27 MHz NGD bandwidth. The "lill"-circuit exhibits an attenuation loss of about -6.2 dB at the NGD center frequency. Then, the two-port black box model of "lill"-NGD-circuit represented by touchstone data of the measured S-parameters is exploited for the transient simulation. The measured group delay (GD) illustrates that the tested "lill"-circuit operates as a BP function regarding the NGD with NGD equal to -8.1 ns at the NGD center frequency. The timedomain demonstration of the BP NGD function was performed using a gaussian pulse modulating sine carrier. The innovative experimental setup with the possibility to plot simultaneously well synchronized input and output signals is explained. The BP NGD time-domain response is understood from commercial tool simulation using the touchstone S-parameters of the measured "lill"-circuit by using a Gaussian upconverted pulse having a 27 MHz frequency bandwidth. It was observed that the output signals are delayed when the sine carrier is out of NGD-band. However, the output signal envelope is in advanced of about -8 ns when the carrier is tuned to be approximately equal to the 2.31 GHz NGD center frequency. To confirm the time-domain typical behavior of BP NGD response, an input pulse signal having Gaussian waveform were considered during the test. However, the input signal spectrum must be determined in function of the NGD bandwidth. After tests, measured output signal envelopes presenting leading edge, trailing edge and peak in time-advance compared to the input ones are observed experimentally. The results of the present feasibility study open a potential microwave communication application of BP NGD function notably for systems operating with ISM and IEEE 802.11 standards.

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Section: ) Experimental Setup With S-parameter Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Time-Domain Study for Bandpass Negative Group Delay Analysis With Lill-Shape Microstrip Circuit

et al. 2021

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“…Furthermore, NGDC has attracted much attention because of its abnormal electromagnetic wave propagation characters and wide application prospects. Nowadays, the NGDCs have been applied to group delay equalization of ultra-wideband amplifiers [3,4], linear-phase filters [5,6], efficiency enhancement of feed-forward amplifiers [7], and elimination of phase variation with frequency in phase shifter [8].…”

Section: Introductionmentioning

confidence: 99%

A Tri-Band Negative Group Delay Circuit for Multiband Wireless Applications

Meng¹,

Wang²,

Fang³

et al. 2021

PIER C

Self Cite

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A tri-band negative group delay (NGD) microwave circuit for multiband wireless applications is proposed and self-matched without the need for external matching networks. The frequency range can be influenced by the characteristic impedance of the microstrip lines. Under the condition that the microstrip circuit can be implemented with the common printed circuit board (PCB) fabrication technology, the frequency ratio of the highest NGD band to the lowest NGD band can vary between 3.8 and 10.9. For verification, a 1.2/3.5/5.8-GHz tri-band NGD circuit for Beidou B2, WiMax, and WLAN applications is designed, fabricated, and measured. From the measured results, the NGD times are −1.08 ns, −1.19 ns, and −1.09 ns at three NGD central frequencies with insertion losses of 16.4 dB, 24.6 dB, and 18.9 dB, respectively. And the measured NGD bandwidths are 12.40% for the lower band, 8.60% for the center band, and 3.59% for the upper band, in which the return losses are greater than 16 dB.

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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%

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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A Full-Passband Linear-Phase Band-Pass Filter Equalized With Negative Group Delay Circuits

Cited by 30 publications

References 27 publications

Experimental Time-Domain Study for Bandpass Negative Group Delay Analysis With Lill-Shape Microstrip Circuit

Experimental Time-Domain Study for Bandpass Negative Group Delay Analysis With Lill-Shape Microstrip Circuit

A Tri-Band Negative Group Delay Circuit for Multiband Wireless Applications

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

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