Vikram Jandhyala

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—A new technique, the steepest descent-fast multipole method (SDFMM), is developed to efficiently analyze scattering from perfectly conducting random rough surfaces. Unlike other prevailing methods, this algorithm has linear computational complexity and memory requirements, making it a suitable candidate for analyzing scattering from large rough surfaces as(More)
A programmable wireless identification and sensing device is powered through energy harvesting and a software-defined RFID reader provides the means to investigate optimization approaches for RFID systems. ABSTRACT | The next generation internet will be the internet of things (and not just of computing devices like PCs, PDAs); this is presumed to be enabled(More)
—Passive RFID tags are traditionally assumed to be downlink limited since typical tag sensitivity is considerably poorer than reader sensitivity, due to stringent power limitations. On the other hand, semi-passive tags are generally uplink limited since tag and reader sensitivity are comparable. In this paper, it is demonstrated that judicious choice and(More)
Boundary element methods are being successfully used for modeling parasitic effects in cutting-edge circuit design. The dense system matrix generated therein presents a time and memory bottleneck. Fast iterative solver techniques, developed to address the problem, suffer from convergence issues which become pronounced for large number of right hand sides as(More)
the radiating-basis triangular element, is introduced on this antenna (Fig. 5). The goal here is to combine the matching frequencies of the two created antennas (one with h 1 ϭ 7.5 mm, and the other h 2 ϭ 15 mm) and thus to widen the resultant bandwidth of the structure. This results in a VSWR of about 1.5 (Fig. 6) and a much better adaptation from 3 to 7(More)
The Partial-Element-Equivalent-Circuit (PEEC) approach is an effective method to convert three-dimensional on-chip multi-conductor structures to circuit-level descriptions. In this paper, a triangular-mesh-based PEEC approach is described, wherein the surfaces of arbitrarily-shaped conducting structures are represented by triangular mesh tesselations. A(More)