A Simple Dual Wideband Shared-Aperture Antenna Array with Wide Scanning Angle

A simple dual wideband shared-aperture antenna array with wide 2D angle scanning is proposed in this paper. One printed dipole antenna element operating in X-band and four microstrip Quasi-Yagi antenna elements operating in Ku-band are combined to construct a shared-aperture super cell for the phased array. Gaps are cut on the substrate to reduce the mutual coupling between the adjacent elements. Both the X-band and Ku-band elements are printed on one-layer substrate to realize dual wide bands with the same polarization, meanwhile exhibiting a simple structure. A large array topology composed of 14×12 X-band units and 16×16 Ku-band units is fabricated for verification. Measured results show that the proposed antenna array has wide bandwidths of 11.8% in X-band and 25% in Ku-band, meanwhile it has a relatively wide scanning angle ranging from -60° to +60° with the gain decrease less than 5.1 dB