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Bandwidth Enhancement for Half Mode Substrate Integrated Waveguide Antenna using Defected Ground Structures

Astuti Dian Widi, Rivayanto, Muslim, Simanjuntak Imelda, Firmansyah Teguh, Cahyasiwi Dwi Astuti, Natali Yus

International Journal of Electronics and Telecommunications

2023

Vol. 69, No. 3

449--454

The SIW antenna suffers from the narrow bandwidth for a single cavity and single resonant. Defected ground structure (DGS) with a dual cavity was the solution to solve narrow bandwidth by resulting in hybrid resonance. The hybrid resonance with 14.83% impedance bandwidth is proposed in this antenna design. The first resonance resulted from the combination of the TE101 modes from inner and outer HMSIW cavities while the second resonance resulted from the combination of the strong TE101 and the weak TE102 mode from the inner HMSIW cavity and the addition of the weak TE101 from the outer HMSIW cavity. The measurement antenna design has a broadband antenna with a 14.31% (5.71 – 6.59 GHz) impedance bandwidth by using substrate Rogers RO 5880.