Patent ID: 8134514

Claim:
A coaxial line slot array antenna, comprising: a coaxial line including an inner conductor, an outer conductor provided so as to surround a circumference of the inner conductor, and both ends short-circuited; feeding means for exciting the coaxial line; and a plurality of slots which are formed on the outer conductor with a certain angle with respect to a tube axis direction of the coaxial line and have approximately a resonance length, wherein in a state where the coaxial line is excited by the feeding means to generate a standing wave in the coaxial line, the plurality of slots arranged in the tube axis direction are set to have intervals therebetween of substantially one wavelength in free space, and an interval between one short-circuited end of the coaxial line forming a single sub-array and the slot formed at the short-circuited end is set to be substantially a half-wavelength in the free space.