研究目的
To accurately evaluate the axial ratio of a circularly polarized feed circuit in a primary radiator of a reflector antenna by proposing a method to measure the axial ratio from the reflection coefficient only.
研究成果
The proposed method to measure the axial ratio from the reflection coefficients only has been validated by numerical simulation, showing that it can accurately calculate the axial ratio in a wide frequency range.
研究不足
The method is limited to measuring the axial ratio of a circularly polarized wave feeding circuit and requires accurate phase measurement, which can be challenging at high frequencies.
1：Experimental Design and Method Selection:
The authors propose a method to measure the axial ratio from the reflection characteristic in which the output port on the horn side is short-terminated without measuring the transmission characteristic.
2：Sample Selection and Data Sources:
The method involves measuring the reflection coefficients while changing the distance to the short position.
3：List of Experimental Equipment and Materials:
A circularly polarized feed circuit with two linearly polarized input ports and two circularly polarized output ports is used.
4：Experimental Procedures and Operational Workflow:
The reflection coefficients are measured at different short positions, and the axial ratio is obtained from these measurements.
5：Data Analysis Methods:
The axial ratio is calculated from the reflection coefficients using three different methods, including averaging and solving simultaneous equations.
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