    AN-SOF ANTENNA SIMULATOR
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A Vertical Array for 2m Band.

The antenna consists of four half-wave dipoles, spaced approximately 0.8 of the wavelength apart, and oriented horizontally with respect to the ground plane. By employing transmission lines to control the phase of the dipoles, this design aims to achieve a desired radiation pattern.

To feed the antenna, a 25 Ohm transmission line is connected to the lower dipole. From this dipole, successive 50 Ohm transmission lines are employed to propagate the power to the remaining dipoles.

In this particular design, the radiation pattern is bidirectional. The maximum radiation is obtained near the soil level, indicating a low-angle radiation characteristic. This characteristic is often desirable for long-range communications, as it enables better propagation in the desired direction.

The vertical array demonstrates a gain of 15.3 dBi. The input impedance of the antenna is almost resonant (VSWR = 1.3). This implies that the impedance at the feeding point is closely matched to the characteristic impedance of the transmission line, eliminating the need for a matching network.