In multi-band base station antennas. interference toward neighboring cells at low operating frequency in-creases since tilting angle is frequency-independent and beamwidth in the vertical plane increases as de-creasing the operating frequency. In this paper. the realization of the different phase shifts at each frequency is proposed by using the dispersion relation of the composite ri... https://thegreensjunglebeautyshops.shop/product-category/hoodie/