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In this article, we have proposed a multilayer bidirectional circularly polarized antenna for underground communications. The proposed antenna consists of two slot‐coupled back‐to‐back arranged rotated patches and a microstrip feed‐line. Identical left‐hand circular polarization is achieved in both front and back directions to avoid the undesired polarization mismatch for point‐to‐point connection. A prototype of the proposed antenna is built to validate the design strategy. The measured data, including S‐parameter, axial ratio, radiation pattern, and gain, agree well with the simulation results.
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Deng et al. (2013) studied this question.
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