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Circularly polarised antenna with wide harmonics suppression by two angled C-shaped structures

Circularly polarised antenna with wide harmonics suppression by two angled C-shaped structures

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In this Letter, a circularly polarised (CP) antenna is proposed. The proposed antenna is realised by combining two angled C-shaped structures. By setting different widths (W L and W R) for the left and right angled C-shaped structures, respectively, an asymmetric structure is obtained. Therefore, the proposed antenna exhibits CP characteristics. From repeated simulation results, the authors find that the optimum ratio W L: W R to make the proposed structure operate as a CP antenna is 5: 8. Moreover, the measured reflection coefficient is lower than −2.4 dB within a stopband up to 12 GHz. This means that wide harmonics suppression (up to the fifth harmonic) is successfully achieved.

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.7407
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