| 摘要 |
PROBLEM TO BE SOLVED: To provide an inverted-F type antenna that is suitable for the mount on a rocket where vibration resistance, resistance to shock and ease of frequency adjustment are made compatible. SOLUTION: A radiation element 1 is placed opposite to a ground plate 2 nearly in parallel. One end of the radiation element 1 is connected to the ground plate 2 by a short-circuit terminal 6. A feeding circuit including a center conductor 13 of a coaxial connector 11 supplies a high frequency signal to the radiation element 1. A dielectric material 3 is inserted to nearly an entire gap in an opposed space between the ground plate 2 and the radiation element 1. Machine screws 20, 21, 22 are used by fitting the dielectric material 3 to the ground plate 2. Machine screws 30, 31 are used to fix the dielectric material 3 to the radiation element 1. A capacitance between the radiation element 1 and the ground plate 2 is changed by changing an insertion length of the machine screws 20, 21, 22, 30, 31 to the dielectric material 3 so as to change the resonance frequency of the inverted-F type antenna.
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