Article ID: 2021XBL0001
A spinning linear pattern is often used to measure the axial ratio of circularly polarized antennas. The maximum and minimum envelopes of the spinning linear pattern indicate the semi-major and semi-minor axes, respectively, of an elliptically polarized wave. However, there is large volume of sampled data between the maximum and minimum envelopes, which is not useful. Therefore, an envelope extraction method for a spinning linear pattern using a diode detector algorithm was proposed in this study. The diode detector algorithm was applied by solving the circuit equation using the calculus of finite differences. Through numerical verification, envelopes could be successfully extracted. An averaging method was applied to obtain smoother envelopes.
