    AN-SOF ANTENNA SIMULATOR
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The Four-Square Array

A versatile array is one that consists of four elements, each measuring 1/4-wavelength in height and arranged in a square configuration. This configuration is commonly referred to as the four-square array.

The feeding system of this array comprises six transmission lines, carefully set in terms of length and interconnections, in order to achieve a directional radiation pattern. This design boasts several attractive properties, which include:

1) 3.3 dBi forward gain, considering an average ground.
2) 3 dB beamwidth of 100.
3) 20 dB or better front-to-back (F/B) ratio maintained over a 130 angular range.
4) Symmetry that allows for directional switching in 90 increments.

By employing the feed system presented in this model, the antenna demonstrates excellent performance, with limitations primarily determined by environmental factors. Furthermore, a method for remotely switching the direction of this array can be implemented.
