| 摘要 |
PURPOSE:To reduce the cost and size of a monitoring and detecting circuit for a microwave signal by composing the circuit of one microwave directional coupler. CONSTITUTION:When the microwave signal is applied to a terminal, a microwave coupled by the directional coupler 5 appears at a terminal 3, and this signal while led to a microwave monitor output terminal 11 through an attenuator 10 is detected by a diode 7 and a capacitor 8 and led to a detection output terminal 9. Therefore, the detected DC signal is outputted to this terminal 9 and usable for monitoring transmit output power. Those output terminals 11 and 9 are isolated from each other by the attenuator 10, so the detection output signal at the output terminal 9 is not influenced by the termination condition of the microwave monitor output terminal 11.
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