Fast Estimation of Field in the Shadow Zone for Finite Cylindrical Structures by Modified Edge Representation (MER) in Compact Range Communication

Maifuz ALI  Makoto ANDO  

IEICE TRANSACTIONS on Communications   Vol.E99-B   No.7   pp.1541-1549
Publication Date: 2016/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015EBP3405
Type of Manuscript: PAPER
Category: Antennas and Propagation
circular plate,  cylinder,  compact range communication,  equivalent edge currents (EECs),  Fresnel zone number,  millimeter wave,  modified edge representation (MER),  

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The 60 GHz band compact-range communication is very promising for short-time, short distance communication. Unfortunately, due to the short wavelengths in this frequency band the shadowing effects caused by human bodies, furniture, etc are severe and need to be modeled properly. The numerical methods like the finite-difference time-domain method (FDTD), the finite-element method (FEM), the method of moments (MoM) are unable to compute the field scattered by large objects due to their excessive time and memory requirements. Ray-based approaches like the geometrical theory of diffraction (GTD), uniform geometrical theory of diffraction (UTD), uniform asymptotic theory of diffraction (UAT) are effective and popular solutions but suffer from computation of corner-diffracted field, field at the caustics. Fresnel zone number (FZN) adopted modified edge representation (MER) equivalent edge current (EEC) is an accurate and fast high frequency diffraction technique which expresses the fields in terms of line integration. It adopts distances, rather than the angles used in GTD, UTD or UAT but still provides uniform and highly accurate fields everywhere including geometrical boundaries. Previous work verified this method for planar scatterers. In this work, FZN MER EEC is used to compute field distribution in the millimeter-wave compact range communication in the presence of three dimensional scatterers, where shadowing effects rather than multi-path dominate the radio environments. First, circular cylinder is disintegrated into rectangular plate and circular disks and then FZN MER is applied along with geodesic path loss. The dipole wave scattering from perfectly conducting circular cylinder is discussed as numerical examples.