| 摘要 |
PURPOSE: An isolator/circulator having a propeller-type resonator provided with plural symmetric magnetic field walls is provided to reduce the size by controlling an operation frequency of the isolator/circulator through the plural symmetric magnetic field walls. CONSTITUTION: A resonator(500) has three symmetric propellers to transmit an unidirectional signal. Slot forming units(507,508,509) are provided with plural slots(501) between the propellers in order to form a symmetric magnetic field wall. Band width expansion transmitting lines(506a,506b,506c) are formed on a side at every propeller to expand a bandwidth. The first electrode(505a), the second electrode(505b), and the third electrode(505c) are formed on every end of each of the transmitting lines(506a,506b,506c). The isolator includes a load resistor connected to one of the electrodes(505a,505b,505c).
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