RESEARCH ON ELECTRICALLY SMALL ANTENNAS
Summary rept. no. 2
TECHNISCHE HOCHSCHULE MUNICH (GERMANY F R)
Pagination or Media Count:
This report concerns the improvement of the impedance relationships of dipoles whose actual length is small as compared to the wave length in free space. This improvement should be obtained as a result of directly surrounding the dipole with dielectric or magnetic medium. The surrounding shape should not have too large a volume since the resulting increase of antenna size should be kept small. Sect. I states exactly those characteristics of impedance behaviour which should be improved, especially efficiency and bandwidth of the dipole. The value of the radiation resistance itself is not very important. Sect. II gives a summary of the physical effects introduced by a surrounding dielectric. Two different effects exists 1 An altered impedance transformation since the wave impedance in the region of the radiator has been changed. 2 A stronger formation of space waves since the wave length in the dielectric is smaller than in air causing a larger ratio of radiator length to wavelength within the dielectric. Sect. III, IV and V contain the fundamental theory.
- Electrical and Electronic Equipment