Title :
The effects of a nearby biological body on the parameters of a small hand-held transmitter operating in the HF band (3 MHz-30 MHz)
Author :
Cooper, Richard M. ; Radcliff, Roger
Author_Institution :
Dept. of Electr. & Comput. Eng., Ohio Univ., Athens, OH, USA
fDate :
6/1/1994 12:00:00 AM
Abstract :
The effects of a nearby biological body on the efficiency and radiation patterns of a small hand-held radio operating in the HF band are determined by computer modelling. The close proximity of the radio operator´s body results in the scattered field from the body reradiating and perturbing the known free-space current distribution on the antenna to some extent. However, due to the extremely small electrical size of the radiating system, this body-to-radio coupling is assumed to be minimal and henceforth neglected. Thus, a direct moment method is used to solve a volumetric electric field integral equation with the near field of the radio used as the excitation field. Once the equivalent volumetric currents are determined, the efficiency and radiation patterns are found using these currents and the unperturbed free space current of the radio antenna
Keywords :
antenna radiation patterns; biological effects of fields; dipole antennas; integral equations; numerical analysis; radio transmitters; 3 to 30 MHz; HF band; biological body; computer modelling; dipole antenna; efficiency; equivalent volumetric currents; excitation field; free-space current distribution; hand-held radio; hand-held transmitter; moment method; radiating system; radiation patterns; radio antenna; scattered field; small electrical size; unperturbed free space current; volumetric electric field integral equation; Biological system modeling; Biology computing; Closed-form solution; Computational Intelligence Society; Current distribution; Dipole antennas; Moment methods; National electric code; Radio transmitters; Scattering;
Journal_Title :
Broadcasting, IEEE Transactions on
