Negative group delay circuit with independently tunable center frequency and group delay

Jeong, Junhyung; Mok, Kolet; Kim, Jeayeon; Jeong, Yongchae; Lim, Jongsik

doi:10.1109/apmc.2013.6695092

Cited by 9 publications

(14 citation statements)

References 8 publications

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“…As shown in Table 1, the proposed work has an IL of 3.60 dB when the GD is equal to -2 ns. However, the ILs-28.60 dB in [18], 19.50 dB in [19], and 4.50 dB in [20]-are higher than that of the proposed work for the same GD (e.g., GD = -2 ns). Therefore, the proposed circuit provides a reconfigurable NGD with a low IL compared with the state-of-the-art [18][19][20].…”

Section: Simulation and Measurementcontrasting

confidence: 61%

“…However, these conventional circuits have a fixed NGD. Efforts have been made to design a reflective-type reconfigurable NGD circuit using a 3-dB hybrid and RLC resonator [18][19][20], which suffers from high insertion loss (IL). The IL in these works can be improved by increasing the characteristic impedance of the resonators and decreasing the value of R for the required NGD.…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable Negative Group Delay Circuit with a Low Insertion Loss Using a Coupled Line

Chaudhary

Jeong

2020

J Electromagn Eng Sci

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This paper presents a design of a transmissive-type, low insertion loss (IL) negative group delay (NGD) circuit with a reconfigurable NGD. The proposed circuit consists of a series transmission lines (TLs) and shunt short-circuited coupled lines where an isolation port is terminated with a parasitic compensated PIN diode. Analytical design equations are derived to obtain the circuit parameters for the predefined NGD and IL. The low IL can be achieved because of the very high characteristic impedance of the short-circuited coupled lines. The TL terminated with a PIN diode is used to achieve the constant center frequency of reconfigurable NGD circuit. For experimental validation, the NGD circuit is designed and fabricated at a center frequency (f0) of 2.14 GHz. In the measurement, the NGD varies from -0.5 ns to -2 ns with an IL variation of 2.08 to 3.60 dB at f0 = 2.14 GHz. The NGD bandwidth (bandwidth of GD less than 0 ns) varies from 90 MHz to 50 MHz. The minimum input/output return losses are higher than 10 dB for the overall tuning range.

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Section: Simulation and Measurementcontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Reconfigurable Negative Group Delay Circuit with a Low Insertion Loss Using a Coupled Line

Chaudhary

Jeong

2020

J Electromagn Eng Sci

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“…It is noteworthy that most of previous works related to NGDC can provide only a fixed negative group delay . To obtain a reconfigurable NGD, the circuits presented in realize the RNGDC based on the reflection‐type networks. These circuits show the group delays variation of −2 ns to −10 ns with signal attenuation variation of −20 dB to −40 dB at designed center frequency.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable negative group delay circuit with low signal attenuation

Liu

2017

Micro & Optical Tech Letters

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A novel circuit scheme is presented for the design of reconfigurable negative group delay circuit (RNGDC) with very low signal attenuation (SA), which is based on a lossy coupled‐line Microstrip (MS) resonator. Theoretical analysis indicates that reconfigurable characteristics in the proposed circuits can be obtained by tuning the resistance of the variable resistor, which is loaded at a specific point on the MS resonator. Based on the study of one‐stage RNGDC, a two‐stage RNGDC arranged in an anti‐symmetrical manner is designed to provide an extended reconfigurable negative group delay range. To validate the performance of the proposed circuit scheme, the prototypes of one‐stage and two‐stage RNGDC have been designed working at a center frequency of 1.73 GHz. Measured results of the two‐stage RNGDC exhibit a group delays variation of −2 ns to −10 ns with signal attenuation variation of −4.5 dB to −9.3 dB at the center frequency, which demonstrates much lower SA compared to the previously‐reported RNGDCs.

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“…It is noteworthy that most of NGD microwave circuits were built on Lumped RLC networks [1,2]. To overcome the problem of parasitic performance of lumped elements in RF and microwave frequencies, the NGD circuits (NGDCs) using distributed elements have been proposed in literatures [3][4][5][6][7]. Basically, the distributed elements NGD networks can be divided into two categories: reflection-type and transmission-type.…”

mentioning

confidence: 99%

“…Basically, the distributed elements NGD networks can be divided into two categories: reflection-type and transmission-type. The NGD characteristics of the reflection-type networks can be obtained from the reflected signal of the lossy band-stop structures [3,4], which have excellent reflection coefficients with the expense of extra components (such as a hybrid coupler). Similarly, in the transmission-type NGD networks, the NGD phenomena are determined from the transmitting signal of lossy bandstop structures [5][6][7].…”

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confidence: 99%

Compact transmission‐type negative group delay circuit with low attenuation

Liu

2017

Electron. lett.

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A novel circuit is presented for the design of transmission-type negative group delay circuit (NGDC) with low signal attenuation. By loading a lumped resistor at a specific point on the loose-coupling microstrip (MS) resonator, a lossy coupled-line resonator is proposed, the size of which is effectively reduced by employing an open radial patch. A cascaded two-stage NGDC scheme is presented to realise an enhanced negative group delay (NGD) value and better reflection coefficients. The layout of the two-stage NGDC is designed in an anti-symmetrical back-to-back manner. To validate the performance of the proposed circuit scheme, a prototype of the two-stage NGDC has been designed, the working bandwidth of which is 35 MHz with a centre frequency of 1.79 GHz. This circuit is fabricated on Rogers RO4350B substrate with a thickness of 20 mil. A measured maximum NGD of −7.7 ns and a corresponding signal attenuation of as low as 8.6 dB have been obtained. Reflection coefficients are better than −20 dB. This NGDC occupies a compact size of 0.3λ g × 0.18λ g , which is much smaller compared to the previously reported NGDCs with distributed elements.

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Negative group delay circuit with independently tunable center frequency and group delay

Cited by 9 publications

References 8 publications

Reconfigurable Negative Group Delay Circuit with a Low Insertion Loss Using a Coupled Line

Reconfigurable Negative Group Delay Circuit with a Low Insertion Loss Using a Coupled Line

Reconfigurable negative group delay circuit with low signal attenuation

Compact transmission‐type negative group delay circuit with low attenuation

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