IEICE Communications Express
Online ISSN : 2187-0136
ISSN-L : 2187-0136
Envelope detection of a spinning linear radiation pattern based on diode detector algorithm for amplitude modulation
Takuichi HiranoAtsuki Yada
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2021 Volume 10 Issue 5 Pages 219-224


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.

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