The Multiband Quad

摘要

The advantage of the quad antenna is that it can be made into a high performance multi-band antenna by nesting quad loops for the different bands on a common support structure as shown in Figure 1. The total area is no larger than that required by the largest beam of the group - normally a 14MHz beam for upper HF applications. The arrangement shown is for a three-band quad, but how do you feed it?