The radar uses an open frame truncated parabolic antenna with a stacked antenna feed.
2.
For fine attitude control, the S-band antenna feed was mounted slightly off-axis.
3.
In front feed, the antenna feed, the small focus, in front of the dish.
4.
A large loading coil is required at the antenna feed point to cancel the capacitive reactance of the antenna to make it resonant.
5.
Most often this is used close to an antenna feed horn in order to allow transmit and receive signals to operate on separate polarizations.
6.
Particularly with a transmitting antenna, the antenna feed is a critical component that must be adjusted to work correctly with the antenna and transmitter.
7.
Any anomaly or fault with the antenna or antenna feed cable will reflect transmitter power back into the receiver, possibly causing the receiver to be overloaded.
8.
In measuring the impedance or radiation pattern of a balanced antenna using a coaxial cable, it is important to place a balun between the cable and the antenna feed.
9.
In this frequency range their realization is very difficult because of the very high voltages that occur in the huge tuned loading coils that are used in the antenna feed.
10.
The delta RF signals are created by pairs of antenna feed-horns located adjacent to the sum feed-horn ( sum feed-horn not shown in the figure ).
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