Abstract: A microstrip linear array of dipoles is disclosed wherein the dipoles are phased in alternate directions thereby enabling them to be spaced at approximately one-half wavelength intervals along or across a microstrip line instead of the typical one wavelength interval. An additional embodiment includes two linear arrays of oppositely polarized dipoles fed by tributary lines located at either side of a main microstrip line. Alternatively, first and second linear arrays of dipoles are disposed on opposite sides of a circuit board and the dipoles fed by microstrip line that evolves into a balanced two wire line. The ground plane on one side of the circuit board is made to gradually taper to a width equal to the microstrip line on the opposite side at which point the latter is called a two-wire line.

Abstract: Herein disclosed are antenna elements comprised of a dipole reactively coupled to a feed line on a microstrip board; and linearly and circularly polarized arrays of such elements.

Abstract: A broadband 180.degree. 3 db hybrid coupler useful in mixing, combining and/or splitting circuits, the hybrid including slot line and microstrip hybrid components disposed on opposite planar surfaces of a dielectric substrate, one of the components having three ports and associated arms while the other component having a single port and arm, the hybrid providing signal coupling between the hybrid components except where the plane of symmetry of one of the hybrid components bisects the other hybrid component.