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In this paper, a palisade-type defected ground structure(DGS) is proposed for decoupling a miniaturized lowprofile dual-polarized antenna array. The palisade-type DGS loaded between the array elements can achieve both TE decoupling and TM decoupling simultaneously. The decoupling mechanism is elucidated via analyzing and calculating the equivalent capacitance and inductance values of the parallel resonant circuit of the palisade-type DGS when the antenna array is under TE coupling as well as TM coupling. For verification, a dual-polarized antenna array loaded with palisade-type DGS is designed, whose profile is 0.006λ0 and the center-to-center distance between antenna elements is 0.36λ0 at the working frequency of 8.1 GHz. The coupled current analysis of the array loaded with DGS reveals that the palisade-type DGS has the spatial band-stop characteristic, changing the direction of the partially coupled current and thereby reducing coupling. Consequently, the simulated and measured results indicate that TE coupling and TM coupling are reduced about 11 dB and 33 dB respectively.
Li et al. (Mon,) studied this question.