Design of an omnidirectional line array with SIW longitudinal slot antenna

An omnidirectional slot array antenna based on Substrate Integrated Waveguide (SIW) technology is developed in this letter, which inherits the merits of small size, low profile, and low cost etc. form SIW. Omnidirectional SIW slot array antennas are realized by etching longitudinal slots on both sides of the top and bottom metallic planes of a SIW. The experiment results for 6GHz wireless access applications show that 3% bandwidth (VSWR ⩽ 1.5) and a very good omnidirectional radiation pattern are achieved.