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Mode division multiplexing is a promising technique that enables highly parallel and compact on-chip optical communications, but its scalability has been hampered by the crosstalk so far. By exploiting supermodes in closely packed waveguide arrays, low crosstalk between waveguides can be achieved when phase mismatch condition is met. This paper considers two techniques to achieve phase mismatch: waveguide...
This paper presents the design and accurate simulation of two small and medium-sized antenna arrays working in Ka-band (20 GHz). Feeding networks and radiating panels are studied separately and two methods for extracting the scattering matrices of the radiating panels are presented and compared. These developments are an important step of the further modelling of larger arrays.
Today's caches tightly couple data with metadata (Address Tags) at the cache line granularity. The co-location of data and its identifying metadata means that they require multiple approaches to locate data (associative way searches and level-by-level searches), evict data (coherent writebacks buffers and associative level-by-level searches) and keep data coherent (directory indirections and associative...
Contact analysis of mechanical interface has been an important engineering problem. Based on the interaction principle between ultrasonic wave and imperfect interface, experimental method on contact area and distribution of steel-steel interface with pulse-echo technique is presented in this paper. In the method, ultrasonic echo signal being denoised and transformed with Fourier transform to get amplitude...
Wireless power transfer (WPT) could revolutionize global transportation and accelerate growth in the Electric Vehicle (EV) market, offering an attractive alternative to cabled charging. Coil misalignment is inevitable due to driver parking behaviour and has a detrimental effect on power transfer efficiency (PTE). This paper proposes a novel coil design and adaptive hardware to improve PTE in magnetic...
We present an iterative method for joint antenna-array calibration and direction of arrival estimation using millimeter-wave (mm-Wave) radar operating at 77 GHz. The calibration compensates for antennaarray coupling, and phase and gain errors, and does not require any training data. This method is well suited for applications, such as automotive radars, where multiple antenna elements are packaged...
In this paper we provide a method that can be used to analyze power distribution networks with electromagnetic accuracy. The method is applicable to any power distribution network in the chip, package or printed circuit board (PCB). The method can also be used to compute the interaction of the power distribution network between various domains. We provide examples to validate this approach.
Coarse-Grained Reconfigurable Architectures (CGRA) promise both low power and high performance coupled with flexibility, however automatic mapping of applications to such platforms remains a great research challenge. Efficient manual mapping of the data-centric kernels of applications yields great results, however these contain internally control-flow specific tasks, which introduce mapping irregularities...
This paper covers the theory, measurement and analysis of a constructed reference system to capture and acoustically reconstruct a spatial soundfield for device testing. Using a rigid sphere microphone array, a framework is presented for numeric and visual representation of the multidimensional system performance. This is used to compare the measured acoustic spatial recreation of a practical 30 channel...
A non-contact TSV fault detection method is proposed using capacitive coupled probing. The proposed method detects TSV faults by eye-pattern diagrams of extracted EM-modeled transfer characteristics. The TSV and a capacitive coupling is modeled using full wave analysis. Because the measurement is conducted by moving one top probe without contact alignment, it can achieve the fast detection. Moreover,...
Analysis of the accuracy of EM simulations of antenna arrays and arrays in vicinity of complex structures, where array elements are modeled by using far field sources, is presented in this paper. Antenna arrays with strong mutual coupling between the elements are the main problem under consideration. It is shown that if the antenna elements are minimum scattering antennas fed by current generators,...
Through-Silicon-Via (TSV) has been considered as a promising technology in 3D integration. However, it has several challenges such as thermal issues, mechanical stress, etc. Contactless interconnect techniques such as inductive coupling and capacitive coupling have been investigated as alternative solutions. In this paper, we present several capacitive coupled interconnect structures. Various challenges...
High-speed vertical-cavity surface-emitting lasers (VCSELs) are important for optical data transmission applications. Modulation bandwidth for free-running VCSELs typically ranges from few to twenty GHz. An interesting discovery is that modulation bandwidth may be appreciably improved with coherently coupled arrays [1,2]. Recently we reported the ability to tune 2–1 phased, photonic crystal VCSEL...
Wall-climbing robot research is increasingly popular for cleaning, painting, and repairing high-rise buildings. In this study, a compliant wall-climbing robotic platform for various curvatures is presented. In order to adapt to flat and curved surfaces with a single configuration, the robotic platform uses a compliance mechanism with eight legs. A parallel four-bar linkage connects the inner frame...
A novel aperiodic phased array for space-borne synthetic aperture Radar (SAR) is presented which has fewer active chains than a corresponding periodic phased array while maintains comparable radiation performance. The design of proposed aperiodic phased array is based on equal amplitude sparse array. Compare to other aperiodic sparse phased array antennas for space-borne SAR which have been reported...
Present paper describes the design of an iris excited centered slot as coupler in an iris excited center fed slotted array antenna. The design at 10GHz shows a better field and power flow symmetry around the junction of coupling slot. Thus mutual coupling due to soft and hard coupling can be addressed in a better way over inclined slot type coupler.
A multi-beam antenna system fed by a dual-layer Rotman lens is presented in multi-layer SIW (substrate integrated waveguide) technology. The lens is folded in two layers using a new transition based on several star-shaped coupling slots and a SIW integrated reflector along the array port contour. This original transition is broadband and maximizes power transfer between the two layers of the lens...
A practical high-performance waveguide slot array antenna in millimeter wave for monopulse tracking application is presented. At first, a novel compact architecture is developed to lessen the mechanical layers of the array. Several design parameters, including waveguide dimensions, wall thickness and slot width, are chosen to be helpful in dip-brazing process. Then the slot admittance, which taken...
In this article we present an approach to couple model-based testing with static analysis based on a tool coupling between Astrée and EmbeddedTester. Astrée reports all potential run-time errors in C programs. This makes it possible to prove the absence of run-time errors, but users may have to deal with false alarms, i.e. spurious notifications about potential run-time errors. Investigating alarms...
The complementary strip-slot element is a broadly-matched microstrip radiator that has been used to design innovative series-fed arrays. It consists of a microstrip series-fed slot that have its complementary stub on the layer of the microstrip and aligned to the slot. In this contribution, the influence of the strip and slot geometry on its performance is studied through the analysis of four different...
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