Endfire slotline antennas excited by a coplanar waveguide

A novel concept for the excitation of endfire slotline antennas is presented. A channel is cut perpendicular to the slot. The coplanar waveguide that excites the slots is inserted into the channel. Both the endfire slotline antenna structure and the feeder are etched on the same side of the printed circuit board. The concept is experimentally verified on a model. The proposed concept has two advantages over the conventional solution: broader bandwidth and uniplanar realization, which is a great advantage, especially in MMIC (monolithic microwave integrated circuit) technology.<>