Abstract
The advancement of antenna technology in personal wireless communication systems has been encouraged by the increasingly stringent demands placed upon these systems to provide low-power and highly reliable information transfer. The antenna designer must not only consider the cost, manufacturability, compactness, and system integrability of the radiator but also generate a product which satisfies rigid specifications concerning return loss, bandwidth, and gain while operating in a complex radiating environment. Successful, cost-effective approaches to the design of antennas for communication devices rely upon the implementation of sophisticated analysis tools, such as the finite-difference time-domain (FDTD) method, capable of predicting the electromagnetic behavior of complicated topologies. In this work, the behavior of planar inverted F, monopole, and loop antennas is investigated using tools based upon the FDTD approach. Such factors as the effects of the conducting chassis, plastic casing, and biological tissue on the antenna performance are investigated. Experimental measurements are used to validate the results obtained from computations and to provide further insight into the behavior of the different geometries. The use of antenna diversity to reduce the effects of multipath fading is discussed, and several examples of antenna diversity configurations are provided.
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References
K. S. Yee, Numerical solution of initial boundary value problems involving Maxwell's equations in isotropic media,IEEE Transactions on Antennas and Propagation, Vol. AP-14, pp. 302–307, 1966.
A. Taflove and M. E. Brodwin, Numerical solution of steady-state electromagnetic scattering problems using the time-dependent Maxwell's equations,IEEE Transaction on Microwave Theory and Techniques, Vol. MTT-23, pp. 623–630, 1975.
R. Luebbers, L. Chen, T. Uno, and S. Adachi, FDTD calculation of radiation patterns, impedance, and gain for a monopole antenna on a conducting box,IEEE Transactions on Antennas and Propagation, Vol. 40, pp. 1577–1583, 1992.
J. Toftgard, S. N. Hornsleth, and J. B. Andersen, Effects on portable antennas of the presence of a person,IEEE Transactions on Antennas and Propagation, Vol. 41, pp. 739–746, 1993.
R. J. Luebbers and J. Beggs, FDTD calculation of wide-band antenna gain and efficiency,IEEE Transactions on Antennas and Propagation, Vol. 40, pp. 1403–1407, 1992.
J. G. Maloney, G. S. Smith, and W. R. Scott, Jr., Accurate computation of the radiation from simple antennas using the finite-difference time-domain method,IEEE Transactions on Antennas and Propagation, Vol. 38, pp. 1059–1068, 1990.
P. A. Tirkas and C. A. Balanis, Finite-difference time-domain method for antenna radiation,IEEE Transactions on Antennas and Propagation, Vol. 40, pp. 334–340, 1992.
M. A. Jensen and Y. Rahmat-Samii, FDTD analysis of PIFA diversity antennas on a hand-held transceiver unit,1993 IEEE AP-S International Symposium Digest, Ann Arbor, MI, vol. 2, pp. 814–817, 1993.
M. A. Jensen and Y. Rahmat-Samii, Isolated and coupled superquadric loop ant'ennas for mobile communications applications,Proceedings of the 3rd International Mobile Satellite Conference IMSC93, Pasadena, CA, pp. 581–586, 1993.
M. A. Jensen and Y. Rahmat-Samii, Characterization of electromagnetically coupled superquadric loop antennas for mobile communications applications,IEE Proceedings H. Vol. 141, pp. 85–93, 1994.
R. G. Vaughan and J. B. Andersen, Antenna diversity in mobile communications,IEEE Transactions on Vehicular Technology, Vol. VT-36, pp. 149–172, 1987.
W. C. Jakes, Jr.,Microwave Mobile Communications, Wiley, New York, 1974.
K. Hirasawa and M. Haneishi, eds.,Analysis, Design, and Measurement of Small and Low Profile Antennas, Artech House, Boston, 1992.
T. Taga and K. Tsunekawa, Performance analysis of a built-in planar inverted F antenna for 800 MHz band portable radio units,IEEE Journal on Selected Areas in Communications, Vol. SAC-35, pp. 921–929, 1987.
K. Kagoshima, K. Tsunekawa, and A. Ando, Analysis of a planar inverted F antenna fed by electromagnetic coupling,1992 IEEE AP-S International Symposium Digest, Chicago, pp. 1702–1705, 1992.
G. Mur, Absorbing boundary conditions for the finite-difference approximation of the time-domain electromagnetic field equations,IEEE Transactions on Electromagnetic Compatibility, Vol. EMC-23, pp. 377–382, 1981.
D. M. Sullivan, Frequency-dependent FDTD methods using Z-transforms,IEEE Transactions on Antennas and Propagation, Vol. 40, pp. 1223–1230, 1992.
K. Cho and K. Kagoshima, Monopole loaded small loop antennas eliminating a matching circuit,1993 IEEE AP-S International Symposium Digest, Ann Arbor, MI, vol. 3, pp. 1862–1865, 1993.
Y. Yamada, Y. Ebine, and N. Nakajima, Base station/vehicular antenna design techniques employed in high-capacity land mobile communications system,Review of the ECL, vol. 35, pp. 115–121, 1987.
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Rahmat-Samii, Y., Jensen, M.A. Characterization of antennas for personal wireless communications applications. Int J Wireless Inf Networks 1, 165–176 (1994). https://doi.org/10.1007/BF02107416
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DOI: https://doi.org/10.1007/BF02107416