Home > All Issues > PIER B
ISSN: 1937-6472

Vol. 91

Latest Volume
All Volumes
All Issues

2021-03-01 PIER B Vol. 91, 59-77, 2021. doi:10.2528/PIERB20102108

Reflection Budgeting Methodology for High-Speed Serial Link Signal Integrity Design

Richard J. Allred and Cynthia Furse

Reflective interference caused by impedance discontinuities in the interconnect is a serious impediment to high speed serial link designs. The reflections can be addressed either through expensive equalization circuits or through interconnect redesign. Here a new technique for determining the most significant places to make changes in an interconnect design is presented. Through linearizing the S-parameter cascading process three unique reflection budgets are created based on 1) frequency domain insertion loss deviation, 2) time domain peak distortion analysis and 3) time domain reflectometry. Example analysis of a 25.8 Gb/s NRZ system identifies the connectors as the primary contributors to reflective interference and estimates that the interactions with the rest of the interconnect with the connector impedance discontinuities reduces the system eye height by 84 mV.

2021-03-01 PIER B Vol. 91, 39-57, 2021. doi:10.2528/PIERB21011301

A Framework for Peak Power Exceedances of High Power Microwave Radiators Applied to a Vircator Surrogate Model

Mae AlMansoori, Ernesto Neira, Sebastien Lallechere, Jose Felix Vega Stavro, Lars Ole Fichte, Zouhair Nezhi, Chaouki Kasmi, and Marcus Stiemer

Uncertainty quantification and variability analysis are two domains of interest when looking at the efficiency of HPEM sources. Vircator is known to be a low efficiency high power microwave source subject to several generally volatile phenomena such as plasma expansion and shot-to-shot variability. In this study, a computationally low cost framework combining the Extreme Value Theory (EVT) and the Generalised Design of Experiments is proposed in order to study the peak power distribution of a Vircator obtained with a surrogate model. Following the pre-screening of random variables, the optimised parameters are introduced in 2.5D and 3D simulation tools, namely XOOPIC and CST-PS. It has been confirmed that the peak power output can reach a 40% increase. This shows that the EVT proves to be successful in classifying and quantifying random variables to influence the distribution tails.

2021-02-14 PIER B Vol. 91, 19-37, 2021. doi:10.2528/PIERB20122205

Isolation Improvement Using Asymmetric Radiators and Ground Plane Diversity Mechanism in a Six-Element UWB MIMO Antenna Design

Aicha Mchbal, Naima Amar Touhami, Hanae Elftouh, and Aziz Dkiouak

A compact six elements MIMO antenna is presented for UWB applications. The proposed MIMO array consists of non-identical monopole antennas with distinctive ground planes so as to nullify mutual coupling amid side-by-side elements. Also, by properly placing the antenna elements exploiting cross polarization diversity, a good isolation throughout the operating bandwidth is achieved. Moreover, two parasitic inverted L stubs in combination with small rectangular stubs are employed near the middle-placed radiators and corner placed radiators, respectively, in order to extend the frequency band and enhance the impedance matching. Results show a good reflection coefficient about -10 dB, a high isolation >20 dB, an envelope correlation coefficients <0.15, a high diversity gain equal to 9.3, and finally, a maximum value of efficiency for both used antenna elements which is about 78% and 60% with 6 and 5 dBi of gain, respectively. They validate the proposed MIMO antenna efficiency for UWB diversity applications.

2021-02-06 PIER B Vol. 91, 9-17, 2021. doi:10.2528/PIERB20110106

Diffraction Radiation Generated by a Density-Modulated Electron Beam Flying Over the Periodic Boundary of the Medium Section. II. Impact of True Eigen Waves

Yuriy Sirenko, Seil S. Sautbekov, Nataliya Yashina, and Kostyantyn Sirenko

This paper is the continuation and development of the discussion started in our previous work with the same title. For the first time, eigen waves of the plane boundary separating vacuum and an artificial plasma-like medium are considered in reasonably substantiated way and in a sufficiently extensive and profound volume. The possibility of extending the results obtained for a plane boundary to the case of a weakly profiled periodically uneven boundary is shown. This paper demonstrates the potential and urge to use the analytical results in the studies of the resonant transformation of the field of a plane, density modulated electron beam flying over a periodically uneven boundary of a natural or artificial medium in the field of bulk outgoing waves.

2021-02-09 PIER B Vol. 91, 1-8, 2021. doi:10.2528/PIERB20110105

Diffraction Radiation Generated by a Density-Modulated Electron Beam Flying Over the Periodic Boundary of the Medium Section. I. Analytical Basis

Yuriy Sirenko, Seil S. Sautbekov, Nataliya Yashina, and Kostyantyn Sirenko

The paper is focused on reliable modeling of the effects associated with the resonant transformation of the field of a plane, density modulated electron beam, flying over the periodically uneven boundary of a natural or artificial medium, in the field of volume outgoing waves. Here, the general information (analytical basis) is presented on the peculiarities and principal characteristics of electromagnetic fields arising in the situations under consideration, on the procedures for regularization of model boundary value problems describing these situations, and on possible eigenmodes of periodic structures. Without relying on this information, it is impossible to advance considerably effectively in solving numerous urgent physical problems(establishing the conditions providing anomalously high levels of Vavilov-Cherenkov and/or Smith-Purcell radiation; diagnostics of beams of charged particles, artificial materials and media) and in practical implementation of new knowledge aboutthe effects of diffraction radiation and their wave analogues in new devices and instruments of optoelectronics, high-power electronics, antenna, and accelerator technology.