Transceiver antenna of decimetric wavelength range
M. A. Laptev
Special Design Bureau,
Kotelnikov Institute of Radioengineering and Electronics of Russian Academy
of sciences,
sqare acad. Vvedenskogo, 4, Fryazino
Moscow region 141190, Russia
The
paper is received on January 30, 2019
Abstract.
In this article, a method for broadband matching of a
shortened symmetrical dipole antenna with a 50-ohm feeder line is presented.
The method is based on the use of a two-link Chebyshev bandpass filter scheme
for matching the reactive component of the antenna input impedance. With this
type of matching, the capacitance of the series circuit of the bandpass filter
is formed by the input capacity of the antenna. At the same time, the antenna
radiation resistance is the load resistance of the filter of the shortened
dipole. Results of calculations of the matching device of the reduced antenna
model are presented. Calculations are performed and graphs of the dependences
of the efficiency and the operating frequency band of the antenna on the values
of the shunt resistors are presented. The results of full-scale measurements of
the S11 parameters of the lessened model and the full-size antenna are presented.
It is shown that the developed matching method allows to extend the antenna
bandwidth up to ≈35% in terms of the reflected signal level minus 10 dB, which
corresponds to the VSWR ≈ 2. At the same time, the antenna dimensions are
reduced by 2.5 times in comparison with the half-wave dipole. The developed
matching method can be used to match symmetrical dipole antennas, which are
used in conditions of limited installation space and to reduce mass-dimensional
characteristics.
Keywords:
symmetrical dipole antenna, matching device.
1. Goshin G. G. Ustroistva SVCh I Antenny [Microwave
Devices and Antennas: Tutorial]. In 2 part.Tomsk, Tomsk Interuniversity Center
for Distance Education, 2003. Part 2: Antennas. pp. 65 - 69. (In Russian)
2. Chernyshev B.V. Broadband matching shortened antennas.
Zhurnal Radio Electroniki – Journal of
Radio Electronics. 2017. No.
7. Available at:
http://jre.cplire.ru/jre/jul17/1/text.pdf (In Russian)
3. Grechikhin A. Electrically small antennas: opportunities and
delusions. Radio, 1992, No. 11, p. 9 (In Russian)
4. Laptev M. A. (SDB IRE RAS)Symmetric dipole antenna. Patent RF, pubished.
06.12.17, Bull. No. 34., submitted 07.04.2017, Pat. ¹ 175491 (In Russian)
5. Voitovich N. I., Ershov A. V., Sokolov A. N. UKV vibratornye antenny
[VHF dipole antennas]. Chelyabinsk, Published by South Ural State University,
2001. 49 p. (In Russian)
For citation:
M. A. Laptev.