ACES Publication Search
There are 12 search results for:
| Title: | ACES March 2012 Full Journal |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 4510 KB |
| Title: | ACES March 2012 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 601 KB |
| Title: | Cepstral Analysis of Photonic Nanojet-Illuminated Biological Cells |
| Abstract: | It is currently believed that nanometerscale internal refractive index fluctuations within biological cells change significantly during the initial stages of ultra early-stage cancer development well in advance of these changes becoming more pronounced and histologically detectable. Here, backscattered cepstral results of photonic nanojet-illuminated cells are investigated as a means to offer unique advantages for determining the internal structure and composition of cells at sub-diffraction (nanometer) scales. Specifically, the finite-difference time-domain (FDTD) method is employed to obtain the backscattered cepstrum of photonic-nanojet illuminated human colorectal HT-29 cells. Analysis of the backscattered cepstrum of the HT- 29 cells indicates a clear means to distinguish between cells having larger and smaller levels of internal refractive index fluctuations before these changes are histologically detectable. Further, we find that the surface reflection is reduced for the case of nanojet-illuminated cells compared to flat surfaces. |
| Author(s): | C. M. Ruiz, J. J. Simpson |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1077 KB |
| Title: | An Efficient Laguerre-FDTD Algorithm for Exact Parameter Extraction of Lossy Transmission Lines |
| Abstract: | This paper introduces a hybrid finitedifference time-domain (FDTD) method with weighted Laguerre polynomials to extract attenuation constants of lossy transmission lines. In the case of uniform lossy transmission lines, the complex variable compact two-dimensional (2-D) Laguerre-FDTD method is suitable for extracting attenuation constants exactly. To reduce memory requirements in this method, the divergence theorem is used to obtain a memory-efficient matrix equation. A lossy coplanar waveguide (CPW) example is presented to validate the accuracy and efficiency of the hybrid algorith |
| Author(s): | W. Shao, J. L. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 843 KB |
| Title: | Smoothed Particle Electromagnetics Modelling on HPC-GRID Environment |
| Abstract: | In this paper a meshless approach on a high performance grid computing environment to run fast onerous electromagnetic numerical simulations, is presented. The grid computing and the message passing interface standard have been employed to improve the computational efficiency of the Smoothed Particle Electromagnetics meshless solver adopted. Applications involving an high number of particles can run on a grid computational environment simulating complex domains not accessible before and offer a promising approach for the coupling of particle models to continuous models. The used meshless solver is straightforward to program and fully parallelizable. The results of the parallel numerical scheme are reported and tested on a transverse electric propagation case study taken into account to assess the computational performance. |
| Author(s): | G. Ala, E. Francomano |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 804 KB |
| Title: | Transient Analysis of Thin-Wire Antennas over Debye Media |
| Abstract: | This paper presents a numerical procedure to calculate the time-domain response of thin-wire antennas over Debye media. The method is based in an expansion of the electricfield integral-equation in the time-domain (EFIETD), which accounts for the Debye media by using a reflection-coefficient approach. Resulting extended integral equation is subsequently solved by the method of moments. Numerical examples including Debye soils show not only the accuracy of the method but also a higher computational efficiency in comparison with other hybrid numerical techniques. |
| Author(s): | M. F. Pantoja, A. R. Bretones, S. G. García, X. L. Travassos, R. G. Martín |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 1010 KB |
| Title: | Design and Analysis of Multi-Frequency Unequal-Split Wilkinson Power Divider using Non-Uniform Transmission Lines |
| Abstract: | In this paper, the design of miniaturized multi-frequency unequal-split Wilkinson power divider (WPD) using nonuniform transmission lines (NTLs) is presented. To achieve compactness, the uniform transmission lines of the conventional WPD are substituted by their equivalent NTLs. Moreover, two extra compact NTLs transformers are incorporated in each arm of the divider for output ports matching purposes. To prove the validity of the design procedure, two examples of single band and triple band NTL-based WPDs, with 2:1 split ratio, are presented. Both dividers are simulated using fullwave simulators. Furthermore, the proposed single band divider is fabricated and tested. Both simulation and measurements results are in good agreement. Besides the rejection of the odd harmonics over the band 1-5 GHz to a level lower than -15 dB, a total length reduction of 37%, and 16% in the single and triple band WPDs, respectively, is achieved. |
| Author(s): | D. Hawatmeh, K. A. Shamaileh, N. Dib |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 827 KB |
| Title: | Switched Band-Notched UWB/ WLAN Monopole Antenna |
| Abstract: | A switched band antenna that has a capability to operate in tri-band WLAN frequency band (2.4–2.485 GHz, 5.15-5.35 GHz and 5.725- 5.825 GHz) and a band-notched UWB frequency band (the stop-band covers the frequency range from 5.15 GHz to 5.825 GHz) is presented. The antenna uses a switchable ground and a switchable monopole patch to provide a switched band property. To the authors’ knowledge, the proposed antenna represents a feature that is unique to this paper. |
| Author(s): | G. Zhang, J. S. Hong, B. Z. Wang, G. Song |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 969 KB |
| Title: | Dipole Antenna Miniaturization using Single-Cell Metamaterial |
| Abstract: | Miniaturized printed dipole antenna loaded with reactive elements is proposed. The reactive loading of the dipole is inspired by the epsilon-negative (ENG) and double negative (DNG) metamaterial (MTM) inclusions, which enable the loaded dipole to be compacted. The reactive loads are realized by two rake-shaped split ring resonators (SRRs) facing each other. Investigations reveal that the loaded dipole radiates at two separated bands depending on load locations. The new resonance frequencies are lower than the natural resonance frequency of the conventional half wavelength dipole. In this range of frequencies, the radiation efficiency of the composite antenna is high. In order to validate the simulation results, a prototype of the proposed printed dipole is fabricated and tested. The agreement between the simulated and measured results is quite good. |
| Author(s): | A. Jafargholi, M. Kamyab |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 902 KB |
| Title: | A Simple Synthesis of a High Gain Planar Array Antenna for Volume Scanning Radars |
| Abstract: | This paper describes a simple method of designing a rectangular planar array antenna with a flat top characteristic within the given 0o ?? ? ? max region in the 90? = o principal plane to be used in the volume scanning radars. In the method, the main beam of each ingredient linear array antenna is collimated to a predetermined direction with a permissible beamwidth within the total coverage region so that the superposition of the far field ingredient phasors can result in the required overall pattern with the flat top characteristic in the region of max 0o ?? ? ? the principle plane. The main beamwidth requirements of the sub-arrays are met by the excitation amplitudes determined by Dolph-Chebyshev analytical method. Furthermore, the overall main beam characteristic is improved by optimizing the excitation amplitudes using the genetic algorithm. The far field patterns resulted from the half-wave dipole and patch arrays are verified by using the full-wave simulation software, computer simulation technology (CST). |
| Author(s): | F. Tokan, F. Gunes, B. Turetken, K. Surmeli |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 828 KB |
| Title: | Scattering by a 2D Crack: The Meshfree Collocation Approach |
| Abstract: | In this paper, the meshfree collocation method is applied to the problem of EM scattering by a 2D crack in a PEC plane. The hybrid PDE-IE formulation is the mathematical statement of the problem. Consequently, the geometry and the filling material of the cavity is arbitrary. Validations are based on convergence analysis, modal solution and measurement results. Furthermore, elliminating numerical integrations has lead to a fast, accurate, and general meshfree solution. |
| Author(s): | B. Honarbakhsh, A. Tavakoli |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 787 KB |
| Title: | Efficient Analysis of Switchable FSS Structure using the WCIP Method |
| Abstract: | A precise technique based on the wave concept iterative procedure (WCIP) and a fast mode transformation (FMT) is used to adjust the frequency selective surface (FSS) response. This adjustment is achieved by integrating RF-MEMS switches. These systems use the manufacturing processes of integrated circuits. In order to initialize the iterative procedure, an incident wave is defined in spectral domain. The numerical results are compared to those obtained with the finite element method (FEM). The good agreement between simulated and published data justifies the design procedure. |
| Author(s): | N. Sboui, A. Salouha, L. Latrach, A. Gharsallah, A. Gharbi, H. Baudrand |
| File Type: | Journal Paper |
| Issue: | Volume: 27 Number: 3 Year: 2012 |
| Download Link: | Click here to download PDF File Size: 751 KB |