The paper presents a brief overview of the development of so calledcollinear types of antenna arrays. A new type of this structure inmicrostrip technology is further introduced. The principle of theantenna operation is explained via surface current distribution ofexcited modes. Such distribution is reached via geometricalperturbation of a radiating element by slots introduced in such a waythat they e liminate radiation from even half current wavelengths . Theinitial design and optimization of the prototype operating in RFID band(869 MHz) has been performed in planar simulator Zeland IE3D. Aprototype has been realized and measured. The reached results show thatthe presented antenna has directional character as it can be expecteddue to the proposed technology and the presence of a planar groundplane.