| 摘要 |
PURPOSE:To efficiently supply the electric power from a sending-end antenna, to each receiving-end antenna, by attaching a lambda/4 impedance matching box to each branch point of a coaxial line so as to become a power distribution corresponding to necessity. CONSTITUTION:Impedance of coaxial lines 11S, 11A, 11B, 11C and 11C are all set to 50OMEGA. lambda/4 impedance matching boxes 12a, 12b are formed by a coaxial tube. Two kinds of impedance matching boxes 12a, 12b whose matching impedances are 79OMEGA, and 39.5OMEGA which has doubled 79OMEGA are used, an impedance ratio is 2, and a power distribution ratio is 2<2>, therefore, when sending-out power from an antenna S is 100%, the power distribution ratio to receiving-end antennas A-D becomes A:B:C:D=40%:40%:10%:10%, and much power is supplied to A whose radio wave attenuation is large. In such a way, the power can be supplied efficiently.
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