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In this work, a new base station antenna is proposed. Two separate frequency bands with separate radiating elements are used in each band. The frequency band separation ratio is about 1.3:1. These elements are arranged with different spacing (wider spacing for the lower frequency band, and narrower spacing for the higher frequency band). Isolation between bands inherently exists in this approach. This avoids the grating lobe effect, and mitigates the beam narrowing (dispersion) seen with fixed element spacing covering the whole wide bandwidth. A new low-profile cross dipole is designed, which is integrated in the array with an EBG/AMC structure for reducing the size of low band elements and decreasing coupling at high band.I.

A new low power and low cost techn i que is proposed for designing agile antennas by using a reconfigurable radial waveguide excited by a central probe and feeding multiple radiating elements. The power distribution of the radiating elements is controlled by a cylindrical Electromagnetic Band Gap structure with PIN diodes allowing azimuth beam steering and multiple-beams. The proposed technique permits any polarization and it can be used for beam steering in both azimuth and elevation by adding control circuits in the radiating elements.Numerical and experimental results are presented for validation.

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