NDLI: X-band negative group-delay lossy stub line

Content Provider	IET Digital Library
Author	Ravelo, Blaise
Abstract	This study investigates the negative group delay (NGD) passive circuit constituted by a fully distributed parallel stub line. The proposed S-parameter modelling is developed. The transmission parameter band-pass NGD function identification is described. The NGD characterisation is established by determination of the NGD level and bandwidth in function of the stub line parameters. It was analytically found that with a basic cell consisted of single stub line, the insertion loss is usually degraded to reach significant figure-of-merit which is obtained with the NGD level-bandwidth product. As a solution, it is shown that this insertion loss can be improved with the consideration of matching network. As proof-of-concept (POC), microstrip distributed circuits printed on the flexible Kapton substrate without lumped element were synthesised, designed and fabricated. The theoretical, simulated and measured results are in good correlation. As expected, band-pass NGD behaviours centred beyond 10 GHz were observed. The POC generates NGD level of about −1.5 ns over the NGD bandwidth 0.65 GHz. In the future, thanks to the theoretical approach simplicity and the topology integrability, the NGD principle can be potentially useful for the improvement of RF/microwave circuits.
Starting Page	137
Ending Page	143
Page Count	7
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 1, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2017.0024
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2017-09-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Band-pass NGD Behaviour Bandwidth 0.65 GHz Flexible Kapton Substrate Frequency 10 GHz Fully-distributed Parallel Stub Line Insertion Loss Microstrip Circuit Microstrip Distributed Circuit Microwave Circuit And Device NGD Bandwidth NGD Characterisation NGD Level-bandwidth Product NGD Passive Circuit NGD Principle Passive Filter Passive Network RF-microwave Circuit S Parameter S-parameter Modelling Single-stub Line Topology Integrability Transmission Parameter Band-pass NGD Function Identification Waveguide And Microwave Transmission Line Component X-band Negative Group-delay Lossy Stub Line
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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