Coaxial line slot array antenna and method for manufacturing the same
AssigneeMitsubishi Electric Corporation
InventorsSatoshi Yamaguchi, Yukihiro Tahara, Kazushi Nishizawa, Hiroaki Miyashita, Hideyuki Oohashi
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Abstract
A planar antenna including slot arrays configured to set a narrow interval between elements so as to perform beam scanning in a wide angle range while keeping low loss and low profile. The planar antenna includes: 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; a feeding mechanism for exciting the coaxial line; and a plurality of slots formed on the outer conductor with a certain angle with respect to a tube direction of the coaxial line and having approximately a resonance length.
Claims12
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.
A method of manufacturing a coaxial line slot array antenna,
- the coaxial line slot array antenna being formed by:
- a square 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;
- a plurality of slots formed in an appropriate side surface of the outer conductor, which is parallel to a tube axis direction of the square coaxial line;
- and
- feeding means for exciting the square coaxial line,
- the square coaxial line, the plurality of slots, and the feeding means forming a single sub-array,
- a plurality of the sub-arrays being arranged on a plane to form a two-dimensional array antenna,
- the method comprising:
- individually cutting a plurality of metal conductor plates including respective plate-like portions divided and sliced so as to be parallel to the tube axis direction of the square coaxial line and also parallel to the side surface of the outer conductor including the plurality of slots formed therein;
- and
- laminating the plurality of metal conductor plates in which the respective portions are cut by contact bonding.
Dependencies are inferred from the claim text.