Aerospace and Electronic Systems - October 2018 - 37
Fallahzadeh et al.
Figure 8.
Directive gain patterns in ϕ = 0° and ϕ = 90° planes for the antenna
installed on the satellite mock-up.
Figure 9.
AR in ϕ = 0° and ϕ = 90° planes for the antenna installed on the satellite
mock-up.
Figure 7.
Antenna on the mock-up under test in the anechoic chamber.
MEASUREMENT RESULTS
The fabricated antenna, shown in Figure 1b, has been tested in
the antenna measurement chamber of the University of Tehran.
Figure 10 illustrates that the simulated and measured Voltage
Standing Wave Ratio VSWR of the antenna are both better than
1.25 and are in acceptable agreement. The radiation pattern of the
isolated antenna is also measured, as shown in Figures 11 and 12.
The agreement in the main beam is acceptable, while the main difference starts from elevation angle θ of more than 80°. The antenna
is then placed on the satellites mock-up, seen in Figure 7b, and
the radiation pattern measurements are repeated. The noticeable
effect of the body in the presence of the open solar panels in the
measurement of the radiation pattern of the ϕ = 0° plane, shown in
OCTOBER 2018
Figure 10.
Measurement and simulation results for the VSWR of the antenna.
Figure 13, is the sudden decrease of gain in 66°, due to the open solar panels. This has been verified by the simulations of Figure 14,
where the simulations are compared for the three cases of the antenna standing alone, with the presence of a satellite body with
solar panels closed, and with the presence of a satellite body with
solar panels open. As can be seen, it is only because of closeness
IEEE A&E SYSTEMS MAGAZINE
37
Aerospace and Electronic Systems - October 2018
Table of Contents for the Digital Edition of Aerospace and Electronic Systems - October 2018
Contents
Aerospace and Electronic Systems - October 2018 - Cover1
Aerospace and Electronic Systems - October 2018 - Cover2
Aerospace and Electronic Systems - October 2018 - Contents
Aerospace and Electronic Systems - October 2018 - 2
Aerospace and Electronic Systems - October 2018 - 3
Aerospace and Electronic Systems - October 2018 - 4
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Aerospace and Electronic Systems - October 2018 - 6
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Aerospace and Electronic Systems - October 2018 - 8
Aerospace and Electronic Systems - October 2018 - 9
Aerospace and Electronic Systems - October 2018 - 10
Aerospace and Electronic Systems - October 2018 - 11
Aerospace and Electronic Systems - October 2018 - 12
Aerospace and Electronic Systems - October 2018 - 13
Aerospace and Electronic Systems - October 2018 - 14
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Aerospace and Electronic Systems - October 2018 - Cover3
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