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    • 2. 发明专利
    • ES2088167T3
    • 1996-08-01
    • ES93100848
    • 1993-01-21
    • YOKOWO SEISAKUSHO KKNAKANO HISAMATSU
    • NAKANO HISAMATSUSEKINE MOTOSHIGEYOKOYAMA KAZUHIRONAKAGAWA YUKIOTANAKA EIICHIYOSHIDA SHIGERU
    • H01Q11/08H01Q21/00H01Q21/24
    • A plurality of insulators (18) are disposed in holes, respectively, defined in a metal plate (10) of a waveguide of a circularly-polarized-wave flat antenna. Each insulator (18) has a through-hole (18b; 31) and a protrusion (18d). The through-hole extends from the outside of the metal plate to the inside of the waveguide. The protrusion (18d) protrudes outward beyond the metal plate (10). The protrusion (18d) has a groove (18c) which is open to the outside. Curl antenna elements (22) each have a shaft portion (22a), an arm portion (22b), and a curl portion (22c). The shaft portion (22a) is fitted in the through-hole (18b; 31) of the insulator and partly protrudes outward from the metal plate (10). The arm portion (22b) extends from the protruded end of the shaft portion. The curl portion (22c) is in a substantially helical shape and connected to the top of the arm portion (22b). When the arm portion is engaged with the groove (18c) of the insulator, provided that the position of the groove of the insulator has been set in accordance with a desired orientation of the curl portion (22c) of the curl antenna element, the orientation of the curl portion is automatically set to a predetermined direction.
    • 5. 发明专利
    • DE19982430T1
    • 2001-03-22
    • DE19982430
    • 1999-01-11
    • MITSUMI ELECTRIC CONAKANO HISAMATSU
    • NAKANO HISAMATSUMIYATA MASAAKIFUJIMORI KOTAROMIMAKI HIROAKIYAMAUCHI JUNJI
    • H01Q7/00H01Q9/04H01Q13/08H01Q21/24H01Q3/24
    • A thin plane antenna that copes with the horizontally polarized waves and the vertically polarized waves, or the levo-rotary polarized waves and the dextro-rotary polarized waves, and in which a loop-shaped plane antenna element (12) is arranged in parallel with a ground plane (15), and a first feeder conductor (13) and a second feeder conductor (14) having feeding points displayed by 90 degrees are arranged between the plane antenna element and the ground plane. Central conductors (18a) and (19a) of the coaxial lines are connected to the first and second feeder conductors, and external conductors (18b) and (19b) thereof are connected to the ground plane to feed electric power to the antenna element through the electromagnetic coupling. When the electric power is fed from the first feeder conductor (13), the horizontally polarized waves are radiated and when the electric power is fed from the second feeder conductor (14), the vertically polarized waves are radiated. Upon changing over the first and second feeder conductors, the horizontally polarized waves and the vertically polarized waves can be transmitted and received. By providing the horizontal antenna element with slide elements, further, the levo-rotary polarized waves and the dextro-rotary polarized waves can be transmitted and received.