Field Patterns of Cylindrical and Biconical Antennas

We measured the field patterns by broadcasting a continuous wave (CW) signal from the roof of one building to set up a stationary field. Then we could rotate the antenna (on the roof of an adjacent building) and record the transmitted power as a function of the angle. The data were taken in three different ways to compare not only orientation, but also polarization. The results are below. Note the polarization charts. There is a torroidial pattern due completely to the effect of the polarization. Both the cylindrical-slotted and biconical antenna demonstrate this, but they are 90 degrees out of phase. That is, one has vertical polarization and the other has horizontal polarization. Compare the following charts.


Index of Patterns

Slotted-Cylindrical Antenna Patterns

Biconical Antenna Patterns


Slotted Cylindrical Antenna

Vertical Field Pattern

Horizontal Field Pattern

Horizontal to Vertical Orientation (Polarization)


Biconical Antenna

Vertical Field Pattern

Horizontal Field Pattern

Horizontal to Vertical Orientation (Polarization)


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