Abstract.
The research of ultra-broadband
emitters is of great importance due to the development of ultra-broadband radio
communication and radio monitoring systems. One of the most common ultra-broadband antennas is a
biconical vibration antenna. The paper deals with the investigation of
polyconic vibration antenna mounted on the metallic rod
holder. Primary numerical simulations showed that the metallic rod holder has a
strong influence on the antenna radiation pattern at the working frequency band
from 250 to 1000 MHz. It was proposed to apply to the metallic rod holder a
layer of radar absorbing material (RAM), which filled with coarse-grained magnetic
soft powder, with high magnetic losses in the range of meter and decimeter
wavelengths. It was shown that the application of new RAM decreases the level
of electric current on the metallic rod holder that leads to improvement of antenna
characteristics. The research of the polyconic antenna was performed for the
configurations when a single-layer and a two-layer RAMs are applied. The single-layer
RAM consists of the only coarse-grained magnetic soft powder RAM and the two-layer
RAM consists of the coarse-grained magnetic soft powder RAM as well as a traditional
magnetic RAM based on modified carbonyl iron powder. The antenna characteristics
was optimized by the calculation of thicknesses of the layers using the computational
electromagnetics software FEKO. The optimization has been reached using both
the single-layer RAM of 5 mm and the two-layer RAM of 10 mm, where the
thickness of the first layer of coarse-grained magnetic soft powder RAM is 4,5
mm, the second layer of modified carbonyl iron powder RAM is 5,5 mm. Also the
application of RAMs allows us to decrease standing wave ratio of the polyconic
antenna that extends the working frequency band.
Key words:
polyconic antenna,
broadband antenna, radiation-absorbent material, radiation pattern, standing
wave ratio.
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For citation:
V. N.
Semenenko, K.M. Baskov, D.I. Akimov, A.A.
Politiko, V.A. Chistyaev, N.I. Bobkov. Wideband polyconic antenna with magnetic radar
absorbing material.
Zhurnal Radioelektroniki - Journal of
Radio Electronics. 2018. No. 9. Available at
http://jre.cplire.ru/jre/sep18/12/text.pdf
DOI
10.30898/1684-1719.2018.9.12