The broadband design of a metamaterials-based zeroth-order resonance (ZOR) mushroom antenna with an I-shaped slit is presented and experimentally studied. The presented metamaterials-based antenna uses a unit cell based on a composite right/left handed (CRLH) transmission line and can provide a ZOR frequency. By designing the I-shaped slot resonance frequency adjacently to the ZOR frequency, the presented antenna can achieve a 10-dB bandwidth enhancement of roughly 7 times with respect to a conventional rectangular-shaped mushroom structure.
C. . Lee and J. . Lee, "Characteristics of a single i-shaped slitted zeroth-order resonance mushroom antenna based on metamaterials," Computers, Materials & Continua, vol. 39, no.3, pp. 289–299, 2014.
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