The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A wireless power transfer system with three coils has some characters different from two-coil WPTs. In this paper, a two-coil/three-coil hybrid WPT system is proposed to obtain better performances. The hybrid system is constructed through adding the third coil to the frame of the sending coil of the traditional two-coil WPT system. The dimension of the additional coil is smaller than the original...
Current technology requires diabetics to undergo painful, inconvenient, and discontinuous measurement processes several times a day. Thus, more convenient ways of measuring glucose by utilizing surface enhanced Raman spectroscopy (SERS) technique can be highly desirable. To accomplish commercially viable SERS technologies for glucose detection, an optimal substrate must be designed with higher electromagnetic...
Near range microwave three-dimensional (3D) imaging system, which is based on the principle of synthetic aperture radar, can reconstruct the 3D complex image of observing object and obtain object information including shape, structure and scattering characteristics. The system has advantages of high precision, penetrating, non-ionizing radiation. Therefore, it is widely applied in the fields of hidden...
Metallic nanostructures constitute one of the most important building blocks of contemporary nanoscience and nanotechnology because they support localized surface plasmon resonances (LSPRs) that dramatically enhance light-matter interactions. However, LSPRs are strongly dependent on nanostructure sizes, shapes, orientations and interparticle distances. The plasmonic properties of individual metal...
We present a novel approach to non-uniformly spaced array of radiating elements and evaluate its performance and its application potential. In general non-uniformly spaced array elements are difficult if not impossible to analyze. It is often not possible to derive analytically a closed form expression for its radiating pattern. In addition radiating elements of the array are just the primary radiating...
Compact 2-way and 4-way high-power microwave (HPM) waveguide combiners to realize coherent microwave combination were theoretically designed and proof-of-principle experimentally tested. Symmetry boundary is used to simplify the optimization course and design the structure. A central spherical crown with special spatial position and radius was used to realize the low return loss of each port and high...
A shaped power pattern synthesis with reduction of dynamic range ratio (DRR) is presented in this paper. Controlling the DRR of the excitations for the shaped power pattern synthesis is very useful since it can reduce the output power loss and also simplifies the complexity of the feeding network design. The synthesis of shaped pattern is typically a nonconvex optimization problem. To solve this problem...
We present an electromagnetic optimization environment based on full-wave solutions via surface integral equations and the multilevel fast multipole algorithm (MLFMA). Optimizations are performed by using genetic algorithms, while the required trials are performed accurately via MLFMA. The developed mechanism can handle many different operations, such as portion moving/removing, rotation, and gap...
Downward looking sparse linear array three-dimensional synthetic aperture radar (DLSLA 3-D SAR) can obtain the 3-D image of the true scene, and compressive sensing (CS) provide the solution for cross-track super-resolution reconstruction. This paper concerns the issue of optimizing the measurement matrix, which affects the reconstruction performance. Two mutual coherence based criteria are proposed...
This work presents an analysis and optimization of a microstrip wideband switching system for a 16×16 three-dimensional microwave imaging sensor array. Microwave switching system, or RF multiplexer, is necessary for microwave imaging system because of the limited transmitting/receiving port and multiple antenna elements. Using compact RF switches, a switching system selects and connects each of the...
The optimized metasurface layer is introduced into antenna design, which is generated by dividing a 2-D rectangular area into some grids, then the initial 2-D chromosome population is produced randomly. The size of population is the number of grids, “1” represent the metallized areas and “0” represent the areas without metal. Based on this model, we optimized two parasitic metasurface layer under...
There have been many research publications on the topic of optical network survivability where the networks is modeled as a graph with a given topology composed of nodes and links. Such modeling does not enable the consideration and optimization of the shape of cables. One glaring example is the 2006 Hengchun earthquake that occurred on December 26 near the south coast of Taiwan and caused catastrophic...
The synthesis of reconfigurable array antennas with as few members as possible has become a hot topic in recent years. With the reduced number of the array weights and the cost of whole hardware systems, it has been used in many practical applications, such as air traffic control radars, wireless communications and so on. The synthesis methods include the analytical technique, genetic algorithm (GA),...
Optimization methods can be mainly divided into two categories: deterministic and heuristic methods. Traditional loaded antenna optimization technique is used heuristic methods. Space mapping (SM) was introduced by J. W. Bandler as a surrogate-based optimization technique It converts the complex and time-consuming optimization of the fine model into a simple and efficient optimization of the coarse...
It is hard to choose one appropriate sparse reconstruction algorithm from multiple existing algorithms in different occasions. Being aware of this difficulty, four typical sparse reconstruction algorithms are studied to present comprehensive performance evaluations in terms of reconstruction accuracy, super-resolution ability and noise immunity, and it is found that the BCS algorithm performs best...
In this talk, we will propose a new optimization scheme for solving electromagnetic inverse scattering problems. In the inverse scattering problemthe physical properties of hidden targets, i.e., the permittivity and/or permeability can be retrieve from the measured scattering data excited by several incidences. In [1], by the MR-FFT-TSOM, the almost perfect ‘Austria’ profile, with permittivity εr...
A pattern synthesis method based on the genetic algorithm and convex algorithm is presented for featuring a minimum side-lobe level of the planar thinned antenna array. The genetic algorithm focuses on the selection of the planar array elements excitation to accomplish the array thinning. The convex optimization is applied to assign the weight coefficient of array elements for the lower side-lobe...
Sensitive transduction of bio-molecular binding events on chip carries profound implications to the outcome of a range of in vitro sensors. This includes biosensors that address research as well as diagnostic questions of clinical relevance, e.g., profiling of biomarkers, protein expression, drug and toxicity screening, drug-efficacy monitoring, among others. Nanostructured biosensors in general,...
Some major global optimization algorithms, which involves all the optimized variables in one problem, were used to synthesize time-modulated linear antenna arrays (TMLAs) in the existing literature. In this work, a hybrid approach, combining differential evolution (DE) algorithm and convex optimization, is proposed. This hybrid method is performed to optimize the static excitations amplitude and the...
The Ultra-Wideband (UWB) antenna, as core device in high-speed wireless communication, is widely applied to cell phones, wireless internet, internet of things, and almost all kinds of hand-held and wearable mobile communication equipments. Faced with a plethora of constraints, such as compact size, low power consumption, high bandwidth, and cost-effective manufacture, etc., the design of UWB antenna...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.