THE VARIATIONS OF OMINIDIRECTIONAL CIRCULARLY POLARIZED ANTENNAS FOR SATELLITE TELEMETRY/TELECOMMAND APPLICATIONS

Year 2017, Volume: 17 Issue: 2, 3351 - 3359, 27.07.2017

Ceyhan Turkmen , Mustafa Secmen

Abstract

In this paper, the design, production and results of different
types of omnidirectional and circularly polarized antennas for satellite
communication applications such as telemetry or telecommand, are explained. These
antennas consist of identical inclined slots placed on a circular waveguide and
two radially outward parallel cylindrical plates in order to provide circular
polarization. The feeding of the antenna is provided by a special transition
structure between rectangular waveguide to circular waveguide with slots. The
first type of antenna contains eight identical slots on the circular waveguide,
which gives about 3 percent frequency (impedance) bandwidth for 10 dB return
loss. This antenna provides gain
variation of about 0.7 dBi and axial ratio lower than 1 dB in the azimuth plane
at the center frequency. The second type, which is designed to enhance the
frequency bandwidth, includes nonidentical slots on the circular waveguide
where the length of four among eight slots is reduced. This enhanced version
increases impedance bandwidth to 5.8 percent. The gain variation and axial
ratio performances of the second type antenna are slightly lower as compared to
first version at the expense of improvement in bandwidth; however, the results
of both types are still satisfactory for satellite applications.

Keywords

Slotted Array, Circular Polarization, Omnidirectional Antenna, Satellite Communication

References

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