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Time-reversal radar imaging takes advantage of concepts based on time-reversed wave propagation to improve object resolution when these objects are located in a complex environment. There exists a multitude of propagation paths, making their imaging difficult. However, multipath can also be used to enhance the object location and shape. In the case of synthetic aperture radar (SAR) imaging, multipath...
We present a modified diversity evaluation method for body-worn antennas. The novelty introduced in this method amounts to considering the human body channel separately from the surrounding environment. This formulation can therefore be easily adapted to different environments via post-processing. Our study for antenna diversity includes three human postures (standing, kneeling, and prone) to increase...
In this paper, we present a modified diversity evaluation method for body-worn antenna systems. The novelty introduced in this method amounts to considering only the human body interactions and indirectly assessing the environment effects. Thus, this formulation can be adapted easily to any environment. The environment is modelled through the polarization and incident angle of the incoming and outgoing...
Through-wall radar imaging is a challenging area of research due to the complex multi-layer and inhomogeneous structure of building walls. The wall distorts and attenuates the radar signal in a way that is not easy to predict, except in the most simple of cases. In this paper a general periodic model is developed and applied to the imaging algorithm. Periodic dielectric wall models for microwave transmission...
In this paper a parallelization process to take advantage of idle CPU resources is discussed. Also the feasibility of utilizing Windows-based desktop computers within an organization to perform EM design optimization is demonstrated. As part of the demonstration, a wideband antenna array was designed and shown to obtain remarkable bandwidth using a textured FSS-like antenna element in a large array.
This paper proposes 4/6-port lumped element printed microstrip circuits composed of dual and coupled transmission lines to realize higher order dispersion behaviors emulating the (degenerate band edge) DBE crystals and magnetic photonic crystals (MPC). Harnessing the maximally flat dispersion of DBE unit cells resulted in a miniature printed antenna with a lambda0/9 times lambda0/9 footprint, 3% bandwidth...
Wideband antennas that can operate over a frequency range from 10psilas of MHz up to several GHz is highly desirable, yet a challenge (Kramer et al., 2006). As expected, a major challenge is to keep the size small while maintaining bandwidth. Another and key challenge is the need for a ground plane that does not deteriorate the UWB performance for conformal installations (Kramer et al., 2006). This...
A body-worn, meandered flare dipole was presented for operation at UHF frequencies. Measurements and simulations provided reference for its performance and applicability. Some mounting options were discussed and additional configurations will be discussed at the conference. As is evident from the given patterns, the body-worn antenna is highly sensitive to its location and mounting. Moreover, considering...
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