| 摘要 |
PURPOSE:To obtain the satisfactory dispersion type delay characteristics, by using 4 reflection lattices for reflecting 2 reed screen type electrodes and a surface wave in the direction of right angles. CONSTITUTION:A surface wave radiated from an input transducer 22 is reflected in the direction of right angles by a reflection lattice 26, is further reflected in the direction of right angles by a reflection surface 27, and reaches an output transducer 23. Subsequently, when intervals of reflection elements constituting the reflection lattice are decreased gradually as they go away from the transducer 22, not only the frequency but also the delay time are increased. In the same way, the surface wave radiated from the transducer 22 is reflected in the direction of 180 deg. by reflected lattices 24, 25, and reaches the transducer 23, but in this case, on the contrary, intervals of reflection elements constituting the reflection lattice are increased gradually as they go away from the transducer 22, and the frequency is increased and the delay time is decreased. |
