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Presents a finite-difference time-domain (FDTD) subgridding technique for modeling dielectric devices that allows for increased resolution in regions of interest without increasing the overall computational requirements beyond the available resources. Concept of the method; Procedures involved; Formulation; Sample application.

Calculates the specific absorption rate (SAR) distributions in human head exposed to radiation from handheld devices using multigrid finite difference time domain (FDTD) code. Effects of human body and antennas and polarization conditions on SAR values; Dominance of human body effect at lower frequencies.

A new coaxial continuous transverse stub (CTS) array is proposed, designed, constructed, and tested. It is an omni-directional low cost antenna array which provides good impedance matching characteristics and good tolerance to manufacturing errors. It can be simply fed by a coaxial connector and is particularly suitable for millimeter wave personal communication systems (PCS). It is shown that this type of radiating element provides high percentage of radiation, and for the simulated design of single- and multiple-element arrays, S11 was below -10 dB across a 6 GHz frequency span at the Ka band. A three-element prototype coaxial CTS antenna array was designed, constructed, and tested in the X-band. Experimental results were in good agreement with the simulated performance. Potential application of this new antenna array in multiband operation is also described [ABSTRACT FROM PUBLISHER]