Säteetyssuhde

Säteetyssuhde refers to the ratio of radiated power to the total input power in an antenna. It is a measure of how efficiently an antenna converts electrical power into electromagnetic radiation. A high säteetyssuhde indicates that most of the input power is being radiated, while a low säteetyssuhde suggests that a significant portion of the power is being lost due to factors like resistance in the antenna elements or impedance mismatch.

This ratio is crucial in antenna design and performance evaluation. For instance, in transmitting antennas, a high säteetyssuhde is desired to maximize the range and effectiveness of the signal. Conversely, in receiving antennas, the concept is less directly applied, but understanding the antenna's efficiency is still important for maximizing signal reception.

The säteetyssuhde is often expressed as a percentage. It is influenced by various factors, including the antenna's physical construction, the materials used, its operating frequency, and its environment. Losses within the antenna structure itself, such as ohmic losses in the conductors, contribute to a lower säteetyssuhde. Similarly, if the antenna is not properly matched to the transmission line, power can be reflected back, reducing the amount of power that is actually radiated. Therefore, careful design and tuning are essential to achieve an optimal säteetyssuhde for a given application.