Abstract
An improved measurement method of circularly-polarized (CP) antennas based on linear-component amplitudes is proposed in this paper. By utilizing two sets of orthogonal linear polarization (LP) amplitudes, measurement on axial ratio (AR) of CP antennas can be realized without phase information. However, the rotation sense of the co-polarization cannot be determined due to the absence of the phase information. Above problem is discussed here for the first time, and a solution is presented to determine the rotation sense of the co-polarization by using common auxiliary CP antennas. In addition, there will be some particular cases with large errors in actual measurement. Here a corresponding solution method is given. Finally, co-polarization and cross-polarization patterns can be further obtained from AR results. To verify this improved method, a self-developed CP microstrip array was measured. The measured results are in agreement with the simulated results, which prove this method is correct, effective and practical.
Highlights
Circularly-polarized (CP) antennas have many advantages such as insensitivity to polarization locations, elimination of the signal Faraday rotation effect caused by the ionosphere, and strong anti-interference ability
By utilizing two sets of orthogonal linear polarization (LP) amplitudes, measurement on axial ratio (AR) of CP antennas can be realized without phase information
In patterns, when the LP case occurs, the co-polarization component is approximately equal to the cross-polarization component, which causes that two components cannot be distinguished
Summary
Circularly-polarized (CP) antennas have many advantages such as insensitivity to polarization locations, elimination of the signal Faraday rotation effect caused by the ionosphere, and strong anti-interference ability. They are widely used in satellite communication, radar, GPS and other systems. The first method is to measure one set of orthogonal LP amplitudes and phases by utilizing linearly-polarized auxiliary antennas. The measuring accuracy of AR is improved This method has a problem that the rotation sense of the co-polarization cannot be determined due to the absence of the phase information. Copolarization and cross-polarization patterns are further obtained from AR results To verify this improved method, a self-developed CP microstrip array was measured repeatedly. The measured results are in agreement with the simulated results, which prove the correction method is correct, effective and practical
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