| 摘要 |
PURPOSE:To improve the isolation by arranging the mutual position of 1st and 2nd monopole antennas in a main waveguide so as to be T-shaped form subjected to equi-potential excitation electrically. CONSTITUTION:The 2nd monopole antenna 4 is arranged to a position of a length of nearly l/2 (l is the length of the 1st monopole antenna 3 projected in the main waveguide 2) so as to be orthogonal in T-shape without being in contact with the tip. Further, the 1st monopole antenna 3 is positioned to the main waveguide 1 so that the impedance toward both directions from a position of nearly l/2 long is made nearly equal to each other. Thus, even if the signal inputted from one monopole antenna is induced in the other monopole antenna, since the potential is the same in the level nearly in opposite direction, they are cancelled together and the isolation of both coaxial parts 5, 6 is improved.
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