The two most popular configurations are the Diamond, and Square. From a performance perspective there is no difference, in fact the element configuration may have many different shapes, Circular, Triangle (Delta Loop), or Rectangular. The key criteria is that the loop length must be nominally one wave length, and the elements have to be symmetrical about a line through the feed point and bisecting the structure. Polarity is determined by were the feed point is located; on the bottom it is Horizontal, and on the side (90deg away) it is Vertical.
|There is one other important consideration where the Square configuration is a must. In many multi-band arrays it is possible to feed all 3 or 5 bands at one common location using the Cubex Matching transformer. Only the "BOX" allows this feed method with minimum element distortion.|
of the Cubical Quad Antenna
In the design of Cubical Quad antennas there are several competing goals or constraints that control the final results. Three important ones are Forward Gain, Front to Back ratio, and Source Impedance. Other factors are material related - Boom Length, and number of elements. Variations in the above parameters are modified by the choice of the number of elements, their dimensions, and element spacing.
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