2COMU Inc.

State College, PA, United States

2COMU Inc.

State College, PA, United States
Time filter
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Li S.,Harbin Engineering University | Li W.,Harbin Engineering University | Mao Y.,Harbin Engineering University | Yu W.,2COMU INC. | Elsherbeni A.Z.,Colorado School of Mines
2017 International Applied Computational Electromagnetics Society Symposium - Italy, ACES 2017 | Year: 2017

In this paper, we propose a tunable dual-band left-handed metamaterial (LHM) implemented by embedding a variable capacitor to a single-band LHM. The proposed LHM is analyzed with equivalent circuits from both the aspects of magnetic and electric resonators. From the simulated results and the retrieved effective parameters, it is figured out that double negative characteristics are achieved at two frequency ranges, one is stable while the other one sweeps most of the desired frequencies with the change of the capacitor. Hence, this LHM is able to adjust its negative index frequency ranges according to different requirements. © 2017 ACES.

Yu W.,Jiangsu University | Yu W.,2COMU Inc. | Zhao L.,Jiangsu University | Chen G.,Jiangsu University
Proceedings of the 2016 18th International Conference on Electromagnetics in Advanced Applications, ICEAA 2016 | Year: 2016

Discontinuous Galerkin time domain (DGTD) offers attractive properties when it is applied to solve Maxwell's equations. The DGTD method is originated from the finite volume time domain (FVTD) and finite element method (FEM), and has the advantages of the two methods; furthermore, it is more flexible and accurate, and provides an embarrassingly parallel characteristic than FVTD and FEM. In this chapter, we introduce the basic concept of parallel DGTD method based on message passing interface (MPI) and graphics processing unit (GPU) based thread and memory access coalesced. The parallel DGTD method is then applied to solve the typical engineering problems. The numerical results demonstrate that the DGTD method is accurate and efficient for general electromagnetic problems. © 2016 IEEE.

Li S.,Harbin Engineering University | Yu W.,2COMU Inc. | Elsherbeni A.Z.,Colorado School of Mines | Li W.,Harbin Engineering University | Mao Y.,Harbin Engineering University
International Journal of Antennas and Propagation | Year: 2017

A novel dual-band left-handed metamaterial (LHM) design method is proposed in this paper. Unlike other methods, where the designers focused their attentions on designing single LHM unit with multiple electric/magnetic resonances or combining multiple different LHM units together, the proposed method in this paper introduces an additional magnetic resonance to extract negative permeability, taking advantage of the areas between neighboring units. In this paper, we first designed a single-band single negative metamaterial (μ<0) and then connected neighboring units with metallic wires. This connection introduces a magnetic resonance that extracts another frequency band with negative permeability. With the help of arrayed metallic wires printed on the other side of the substrate, we successfully get a dual-band LHM. The proposed structures are analyzed with equivalent circuits and verified with simulations. © 2017 Si Li et al.

Livesey M.,Accenturem Kingsley Hall | Costen F.,University of Manchester | Yang X.,2COMU Inc.
IEEE Antennas and Propagation Magazine | Year: 2012

The utilization of vector-arithmetic logic units is a promising way to speed up FDTD computations from the viewpoint of hardware acceleration. This paper studies how a streaming SIMD extensions (SSE) implementation can be effi ciently developed, and the situation where SSE is benefi cial for FDTD computations. © 1990-2011 IEEE.

Li Y.,Harbin Engineering University | Li W.,Harbin Engineering University | Yu W.,2COMU Inc.
Microwave and Optical Technology Letters | Year: 2014

A compact coplanar waveguide (CPW)-fed circular slot ultrawideband (UWB) antenna with dual-band filtering characteristic is presented in this article. The dual-band filtering characteristic is achieved by inserting an arc-rectangle-shaped stepped impedance resonator in the circular ring radiation patch and etching a spiral stepped impedance resonator in the CPW-fed transmission line. The numerical and experimental results demonstrate that the proposed antenna can operate on a frequency band between 2.7 and 12 GHz with voltage standing wave ratio less than 2, except for that two filtering bands between 4.8 and 6 GHz and between 7.6 and 8.6 GHz are used to prevent the potential interference from WLAN band and X-band. In addition, the proposed antenna has a compact size and omnidirectional radiation pattern, which is suitable for UWB communication applications. © 2014 Wiley Periodicals, Inc.

Li Y.,Harbin Engineering University | Li W.,2COMU Inc. | Yu W.,Harbin Engineering University | Yu W.,2COMU Inc.
Microwave and Optical Technology Letters | Year: 2013

In this article, a coplanar waveguide (CPW)-fed ultrawideband (UWB) antenna with two sharp frequency rejection functions is proposed. The dual band-notched characteristic is realized by etching a stepped impedance split-ring resonator (SISRR) and a stepped impedance resonator (SIR) in a circular radiating patch and a CPW transmission stripline, respectively. The central frequency of the two notch bands can be controlled by adjusting the SISRR and the SIR parameters. Simulation and experimental results obtained for this antenna show that it exhibits a good radiation behavior within the UWB frequency range and it also has the dual band-notched characteristics in the wireless local-area networks band and X-band, which can mitigate the potential interference between UWB systems and the designated existing narrow-band systems. Copyright © 2013 Wiley Periodicals, Inc.

Li Y.,Harbin Engineering University | Li W.,Harbin Engineering University | Yu W.,Harbin Engineering University | Yu W.,2COMU Inc.
Applied Computational Electromagnetics Society Journal | Year: 2013

In this paper a multi-band/Ultra- Wideband (UWB) Multiple Input Multiple Output (MIMO) antenna, which is composed of two identical microstrip fed triple notch band UWB antennas and a Radial Stub Loaded Resonator (RSLR), is proposed and verified numerically and experimentally. The antenna is designed to meet the requirement of multi-band/UWB communication applications. A Defected Microstrip Structure (DMS) Band-Stop Filter (BSF) and an invert π-shaped slot are employed to design the triple notch band UWB antenna. The resonance characteristics of the DMS-BSF and the band notch functions are presented to realize the proposed triple notch band UWB antenna. The isolation of the multi-band/UWB-MIMO antenna has been enhanced by inserting an RSLR loaded T-shaped stub between two identical triple notch band antennas. Both simulation and measurement results are presented to illustrate the performances of the proposed multi-band/UWB-MIMO antenna. © 2013 ACES.

2COMU Inc. | Date: 2012-04-10

Computer software and hardware for use providing electro-magnetic simulation for general electromagnetic problem simulation.

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