Application of negative group delay active circuits to the design of broadband and constant phase shifters

Ravelo, Blaise; Roy, Matthieu; Pérennec, André

doi:10.1002/mop.23883

Cited by 69 publications

(58 citation statements)

References 7 publications

(19 reference statements)

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“…Therefore, conventional approaches to realize the NGD circuits are based on bandstop structures using either series or shunt RLC resonators [4][5][6][7][8][9][10][11]. The NGD circuits have been used in various practical applications in communication systems, such as shortening or reducing delay lines [11], enhancing the efficiency of feedforward linear amplifiers [12,13], designing broadband and constant phase shifters [14], realization of non-Foster reactive elements [15], and minimizing beam-squint in series-fed antenna arrays [16].…”

Section: Introductionmentioning

confidence: 99%

Negative Group Delay Phenomenon Analysis Using Finite Unloaded Quality Factor Resonators

Chaudhary¹,

Jeong²

2016

PIER

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Abstract-This paper presents a comprehensive method to analyze negative group delay (NGD) phenomenon at microwave frequency. This method is based on a coupling matrix with finite unloaded quality factor resonators. Unlike conventional NGD circuit topologies that use a lumped resistor R along with bandstop resonators, the proposed topology does not require any R for generating NGD and therefore, provides fully distributed circuit realization. The proposed topology has both source to load and inter-resonator coupling structures. Analytical design equations are provided to obtain predefined NGD with matched input/output ports; the proposed structure therefore does not require any extra matching networks. From analytical analysis, it is also found that the NGD bandwidth as well as magnitude flatness can be controlled by inter-resonator couplings. The proposed design theory is proven through fabrications of NGD circuit at a center frequency of 2.14 GHz. The measurement results are in good agreement with simulations and predicted theoretical results.

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Section: Introductionmentioning

confidence: 99%

Negative Group Delay Phenomenon Analysis Using Finite Unloaded Quality Factor Resonators

Chaudhary¹,

Jeong²

2016

PIER

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“…In addition, microwave application for the design of independent-frequency phase shifter is also introduced in [44][45].…”

Section: Fig 1 Ngd Microwave Active Circuitmentioning

confidence: 99%

Demonstration of negative signal delay with short-duration transient pulse

Ravelo

2011

Eur. Phys. J. Appl. Phys.

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“…Then, in [15], a broadband NGD circuit with loss compensation was designed through the use of a specified synthesis method and implemented; this first verification in microwave domain proved to be promising. Indeed, the investigations briefly introduced in [16,17] were about the application of such NGD cells in the design of phase shifter (PS) that exhibits a frequency-independent transmission-phase value, u(x) ¼ C te . Then, the corresponding group delay, s(x) ¼ Àqu(x)/qx is mathematically equal to zero.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of frequency-independent phase shifters using negative group delay active circuit

Ravelo

Pérennec

Roy

2010

Int J RF and Microwave Comp Aid Eng

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This article describes a synthesis method dedicated to the design of frequency-independent phase shifters (PSs). This innovative PS structure consists in a transmission line cascaded with a negative group delay (NGD) active circuit so that the absolute constant group delays generated by both of them are identical but of opposite signs. So, in principle, it exhibits a constant overall phase and a group delay close to zero. Broadband linear positive phase slopes are obtained through use of an NGD active circuit whose characteristics are recalled prior to the extraction of the PS synthesis relations. The design and simulations of a PS of compact size are reported. The experimental results confirm the expected frequency-independent transmission-phase value of 145 6 10 with an insertion gain of 2 6 2 dB over a 160% relative frequency band. At last, future prospects allowed by the specific properties of this PS are presented.

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Application of negative group delay active circuits to the design of broadband and constant phase shifters

Abstract: ABSTRACT:The new phase-shifter configuration described in this report uses a negative group delay (NGD)

Cited by 69 publications

References 7 publications

Negative Group Delay Phenomenon Analysis Using Finite Unloaded Quality Factor Resonators

Negative Group Delay Phenomenon Analysis Using Finite Unloaded Quality Factor Resonators

Demonstration of negative signal delay with short-duration transient pulse

Synthesis of frequency-independent phase shifters using negative group delay active circuit

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