0IO-Shape PCB Trace Negative Group-Delay Analysis

A new shape retrieval method using the Group delay of the Fourier descriptors

In this paper, we introduced a new way to analyze the shape using a new Fourier based descriptor, which is the smoothed derivative of the phase of the Fourier descriptors. It is extracted from the complex boundary of the shape, and is called the smoothed group delay (SGD). The usage of SGD on the Fourier phase descriptors, allows a compact representation of the shape boundaries which is robust ...

Negative group velocity and group delay in left-handed media.

The dynamics of wave propagation in media with negative index of refraction is analyzed through analytical calculations, simulations, and experiments. Using a free space setup, the transmission characteristics of two split ring resonator and strip wire left-handed media (LHM), designed for operation at K -band frequencies (18-26 GHz), are measured. The first LHM, which is 3 unit cells long in t...

Shape Analogies via Group Shape Difference Analysis

In this project, we proposed a novel framework to solve the shape analogies problem between 3D shape collections. Instead of using geometric features based on individuals to describe each shape, we leveraged the idea that fine grained characteristic of a shape can be defined by other similar shapes, and used relationship within collections to depict shapes. To capture the abstract relationship,...

Low Correlation Mimo Antennas with Negative Group Delay

Abstract—A key feature of upcoming 4G wireless communication systems is multiple-input-multiple-output (MIMO) technology. To make the best use of MIMO, the antenna correlation between adjacent antennas should be low (< 0.5). In this context, we propose a correlation reduction technique suitable for closely spaced antennas (distance, d < λ/40). This technique reduces mutual coupling between ante...

Broadband Microwave Negative Group Delay Transmission Line Phase Shifters