| 摘要 |
PURPOSE:To miniaturize the frequency detecting circuit by connecting a tip open stub to one of two terminals being not isolation terminals viewed from an input terminal of a directional coupler, the 1st detector to the other via a band reflection type filter and the 2nd detector to the isolation terminal respectively. CONSTITUTION:The input terminal is connected to a terminal (1) of the directional coupler 11, the 1st detector 13 is connected to a terminal (2) via a dielectric resonator 12, the tip open stub 15 is connected to a terminal (3) and the 2nd detector 14 is connected to a terminal (4). The input signal fed to the input terminal is shared to the terminals (2), (3) from the terminal (1) of the directional coupler 11 and since the terminal (1) is the input terminal, the terminal (4) is the isolation terminal. Further, the signal shared to the terminal (3) is reflected in the tip open stub 15, shared from the terminal 93) to the terminals (1), (4). The signal distributed to the terminal (2) is reflected while not being fed to the detector 13 when the frequency is coincident with the resonance frequency of the dielectric resonator 12 and distributed from the terminal (2) to the terminals (1), (4).
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