Design of Capacitive Slit for Improving Antenna Bandwidth of Binomial Double-Strip Hexacula Omnidirectional Broadband Antenna
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DOI: https://doi.org/10.15866/irecap.v13i4.22839
Abstract
Bandwidth is one of the most significant parameters for antenna. Specifically, binomial double-strip hexacula omnidirectional broadband antenna exhibits an impressive bandwidth of 2.15 GHz, spanning from 0.85 GHz to 3 GHz in frequency. However, this bandwidth fails to meet the target of 2.7 GHz within the 0.3 GHz to 3 GHz frequency range set for binomial double-strip hexacula omnidirectional broadband antenna. In order to address this limitation and improve bandwidth, a technique known as the "capacitive slit" has been employed. This method has aimed to method the input impedance of antenna to a resistive state, thereby maximizing power transfer and increasing bandwidth. Since binomial double-strip hexacula omnidirectional broadband antenna has showed a more inductive input impedance value, the implementation of capacitive slit technique has become crucial in rendering it more resistive. Consequently, several experiments have been conducted, applying capacitive slit to binomial double-strip hexacula omnidirectional broadband antenna on four separate occasions to enhance its bandwidth. The effect of each capacitive slit on bandwidth has been individually analyzed after being placed on each antenna strip. Ultimately, the most favourable results have been obtained during the fourth experiment, yielding bandwidth of 2.68 GHz within the range of 0.32 GHz to 3 GHz. It should be noted that the increase in bandwidth has showed a linear correlation with the number of capacitive slits applied. Overall, the use of capacitive slit technique had proven instrumental in improving bandwidth performance of binomial double-strip hexacula omnidirectional broadband antenna, paving the way for further enhancements in the field of antenna design.
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