Design of millimeter-wave microstrip comb-line antenna array beam-tilting in perpendicular plane of feeding line

Millimeter-wave sensor applications require antennas which can be easily designed for beams with various shapes. Microstrip comb-line antenna is one of the attractive candidates since feeding loss is relatively low rather than a parallel feeding. In the design for required radiation pattern in the plane perpendicular to the feeding line, the design flexibility is low when the number of the feeding line is small. We propose a design technique to extend a design flexibility of radiation pattern in the plane perpendicular to the feeding line. Designs for beam- tilting of several angles are implemented and feasibility of the proposed design is confirmed by experiments in this paper.