Characteristic Mode Analysis of SIR Coupled Dual Band Dipole Antenna

Characteristic mode analysis of a stepped impedance resonator (SIR) coupled dual-band dipole antenna is presented in this paper. Characteristic mode theory is effectively used to understand the resonant mechanism of the antenna. The antenna prototype is realized on the double-sided FR4 substrate of dielectric constant 4.4 and loss tangent 0.025. The proposed dual-band antenna resonates at 2.45 GHz and 5.5 GHz with an impedance bandwidth of 90 MHz and 1.6 GHz, respectively.