Microstrip-Fed Crossed Dipole Antenna Having Remote Electrical Tilt

A panel antenna includes a microstrip-fed radiator array, each radiator being a crossed dipole, with the monopoles of the dipole being loops that are electrically closed and hybrid coupled to the adjacent loops within the radiator. The loops are spaced away from a ground plane. Each four loops and four support straps and a base can be cast as a single piece, for example, since the shorted ends of the support straps are a quarter wavelength away from the loops. The feed system uses asymmetric microstrip power dividers to provide branch feed to the dipoles. Coupling between the feed and the loops uses the support straps and terminates in a stub at the characteristic impedance. Each feed terminates so as to provide roughly a half wavelength of delay for the second monopole, making a differentially-driven dipole. The internal feed permits remote adjustment of phase.