Conference paper
A new method to reduce truncation errors in partial spherical near-field measurements
A new and effective method for reduction of truncation errors in partial spherical near-field (SNF) measurements is proposed. The method is useful when measuring electrically large antennas, where the measurement time with the classical SNF technique is prohibitively long and an acquisition over the whole spherical surface is not practical.
Therefore, to reduce the data acquisition time, partial sphere measurement is usually made, taking samples over a portion of the spherical surface in the direction of the main beam. But in this case, the radiation pattern is not known outside the measured angular sector as well as a truncation error is present in the calculated far-field pattern within this sector.
The method is based on the Gerchberg-Papoulis algorithm used to extrapolate functions and it is able to extend the valid region of the calculated far-field pattern up to the whole forward hemisphere. To verify the effectiveness of the method, several examples are presented using both simulated and measured truncated near-field data.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2011 |
| Pages: | 3259-3263 |
| Proceedings: | 5th European Conference on Antennas and Propagation |
| ISBN: | 1457702509 , 8882020746 , 9781457702501 and 9788882020743 |
| Types: | Conference paper |
Antenna measurements Apertures Finite wordlength effects Gerchberg-Papoulis algorithm Iterative methods Measurement uncertainty Reliability theory Time measurement antenna radiation pattern antenna radiation patterns classical SNF technique data acquisition electrically large antenna measurement extrapolate functions extrapolation far-field pattern partial spherical near-field measurements truncation error reduction method
