Monday, 28 October 2013

KAIRA HBA polarisation orientation

Within each High-Band Antenna (HBA) tile there are sixteen elements comprising a crossed bowtie antenna. These are in "cells" which can be rotated to different orientations depending on the layout of the array and its location in the world. Following some requests from observers we have drawn up the layout of the elements in our tile and made it available for distribution. The result is as follows:

The circle represents the rotating part of the cell. In the centre of that circle is a representation of the printed-circuit board with the amplifiers, etc. The four "blades" of the antennas are connected to this. Two F-type connectors at the bottom of the boards take the signal out to the tile summators (but also bring power and control into the unit).

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