Bandwidth enhancement of dual-band bi-directional microstrip antenna using complementary split ring resonator with defected structure for 3/5 GHz applications

<span>This paper presents a bandwidth enhancement of dual-band bi-directional rectangular microstrip patch antenna. The novelty this work lies in the modification conventional microstip antenna by using combination two techniques: complementary split ring resonator (CSRR) and defected structure (DPS). was studied investigated via computer </span><span>simulation technology (CST). dimension position CSRR on ground plane optimized to achieve dual radiation pattern characteristics. In addition, bandwidths were enhanced defecting suitable shape incorporated patch. A prototype with overall 70.45×63.73 mm<sup>2</sup> has been fabricated FR-4 substrate. To verify proposed design, impedance bandwidth, gain, patterns carried out measurements. measured respectively 560 MHz (3.08-3.64 GHz) 950 GHz (4.64-5.59 while gains each 4.28 dBi 4.63 dBi. good agreement simulated ones. achieves wide performances. Consequently, it is promising candidate for Wi-Fi or 5G communications specific areas such as tunnel, corridor, transit rail.</span>