ACES Publication Search
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| Title: | ACES Express Journal July 2016 Cover |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1208 KB |
| Title: | ACES Express Journal July 2016 Front/Back Matter |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 36 KB |
| Title: | ACES Express Journal July 2016 Full |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 5150 KB |
| Title: | Non-uniform Surface Impedance Absorbing Boundary Condition for FDTD Method |
| Abstract: | Recently, we reported a novel absorbing boundary condition (ABC), surface impedance absorbing boundary (SIABC). SIABC has a comparable absorbing performance compared to CPML, but requires a sufficient long distance between the boundary and the scatter. In this paper, we focus on this issue and introduce the non-uniform SIABC. Non-uniform SIABC archives a similar absorbing performance as the uniform SIABC at a same distance, while the number of the air buffer cells is much smaller. Therefore, it is possible for us to make it more efficient relative to uniform SIABC or CPML. An example of a patch antenna is discussed to explore the accuracy and efficiency of non-uniform SIABC. We also compare the memory usage for uniform SIABC, non-uniform SIABC, and 10-layers CPML. All the results indicate that non-uniform SIABC requires much less memory, needs much less time for simulations, which makes it a potential of being one of the most popular ABCs in FDTD method. |
| Author(s): | Y. Mao, A. Z. Elsherbeni, S. Li, T. Jiang |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1516 KB |
| Title: | Time-Dependent Adjoint Formulation for Metamaterial Optimization using Petrov-Galerkin Methods |
| Abstract: | A time-dependent discrete adjoint algorithm for electromagnetic problems is presented. The governing equations are discretized with a semi-discrete Petrov-Galerkin method. Time advancement is accomplished using an implicit, second-order backward differentiation formula (BDF2). An all-dielectric metamaterial is proposed and gradient-based shape design optimization is conducted. Hicks-Henne functions are utilized for shape parameterization to ensure smooth surfaces, and linear elasticity employed to adapt interior mesh points to boundary modifications. The cost function used in the design optimization attempts to widen the bandwidth of the metamaterial over a desired frequency range. Optimization results demonstrate an increase of the full width at half maximum (FWHM) of reflection from 111 THz to 303 THz. |
| Author(s): | X. Zhang, J. C. Newman III, W. Lin, W. K. Anderson |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1751 KB |
| Title: | A Non-Focal Rotman Lens Design to Support Cylindrically Conformal Array Antenna |
| Abstract: | Rotman lenses offer broad bandwidth, and render to planar structures making them ideal for a variety of applications. However, a limitation of the Rotman lens is that it is based on the assumption of supporting linear arrays. In this paper, we develop a new design technique to enable the lens to feed a conformal array antenna. |
| Author(s): | T. K. Vo Dai, T. Nguyen, O. Kilic |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1746 KB |
| Title: | Efficient MCF Evaluation in a Turbulent Atmosphere over Large Structure Constant Interval |
| Abstract: | A fast and accurate method is derived and simulated to compute the mutual coherence function (MCF) of an electromagnetic beam wave propagating through atmospheric turbulence over a large interval of structure constant. This method is based on expanding the integral equation solution for one value of structure constant into its Pade’ approximation to cover large fluctuation interval. The expansion is compared with numerical results, and a very good agreement was obtained. Such computations are important in practical fields as remote sensing, imaging systems, and optical communications. |
| Author(s): | N. A. Abu-Zaid |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 2196 KB |
| Title: | Multi-Frequency T-Slot Loaded Elliptical Patch Antenna for Wireless Applications |
| Abstract: | In this paper, a multi frequency microstrip antenna (MSA) for wireless applications is designed. The proposed MSA comprised of elliptical patch antenna with T-slot. This antenna is fed by coaxial probe. The designparameters are major and minor axis of elliptical patch,length and width of T-slot and feeding point of probe. Theproposed antenna can provide optimized multi frequencyby varying the above design parameters. FR-4 substratewith dielectric constant 4.4 is chosen. The multifrequencies are 1.57 GHz, 1.96 GHz and 3.4 GHz, whichcovers the applications such as GPS and 4G LTE.The simulation of the antenna is performed using theANSOFT HFSS and it is analyzed for S11 (dB) andradiation pattern. The prototype antenna is fabricated foroptimized dimensions and tested using vector networkanalyzer. Simulation and experimental results arecompared with each other. |
| Author(s): | S. Murugan, B. Rohini, P. Muthumari, M. P. Priya |
| File Type: | Express Journal Paper |
| Issue: | Volume: 1 Number: 7 Year: 2016 |
| Download Link: | Click here to download PDF File Size: 1758 KB |