Projects Document 282-v1

Directivity of a Parabolic Cylinder Antenna

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Document Created:
03 Mar 2008, 13:13
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03 Mar 2008, 13:13
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05 May 2008, 15:24
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The 21 cm project is based on a parabolic cylinder antenna with receivers placed
periodically along the focus line of the antenna. This note calculates the directivity of a parabolic
cylinder antenna fed to a single feed point on focus line of the antenna. The note uses the
physical optics approach. Even though the 21 cm antenna is a receiver, this note will calculate
the directivity of the antenna using the antenna as a transmitter. The far field in the transmitter
mode is easier to calculate and the directivity of the antenna in the receiver mode is equal to the
directivity in the transmit mode because of Lorentz reciprocity.
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