The cross-band mutual coupling of antennas collocated on a finite-sized ground plane smaller than one operating wavelength is studied. As an example, two thin monopole-type antennas are designed at the 900-MHz and 2.4-GHz bands, respectively. The study reveals that the finite-size ground plane greatly affects the 900-MHz cross-band mutual coupling of the collocated monopole-type antennas, which is significant and cannot be ignored. The information derived suggests the possible cross-band interference between antennas with a finite-sized ground plane.
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Chen et al. (2013) studied this question.