Antennas for VHF/UHF personal radio: A theoretical and experimental study of characteristics and performance
- 1 November 1977
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Vehicular Technology
- Vol. 26 (4) , 349-357
- https://doi.org/10.1109/t-vt.1977.23707
Abstract
A theoretical analysis of the characteristics of small personal radio antennas for the 68- to 470-MHz frequency range is given. Representing the human body by a simplified lossy dielectric structure, the influence of the body on the performance of the antenna is investigated in detail, and it is shown how antenna impedance, gain, and radiation patterns can be calculated taking the presence of the body into account. For very short antennas the results indicate that radiation from the body may dominate over the radiation contributed by the antenna itself, and that the presence of the body can increase the antenna efficiency considerably, indicating that even very short antennas may provide acceptable radiation efficiencies. The results of the theoretical work are supported by measurements on practical antennas. Quarter-wave and short antennas of the helical type are compared with respect to efficiency and radiation patterns at 80, 160, and 450 MHz, and it is demonstrated how the physical length of the antenna affects the antenna performance. The design of a very short and compact personal radio antenna is described.Keywords
This publication has 4 references indexed in Scilit:
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- Admittance and radiation efficiency of the human body in the resonance regionProceedings of the IEEE, 1972
- The effect of the human body on radiation properties of small-sized communication systemsIEEE Transactions on Antennas and Propagation, 1968
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