| 摘要 |
PURPOSE:To simplify the shield construction of an intermediate frequency circuit, by separating and locating the intermediate frequency circuit from a high frequency circuit. CONSTITUTION:Transmission high-frequency circuit sections 11a, 11b and reception high-frequency circuit sections 12a, 12b using a dielectric substance oscillator and resonator are respectively connected to waveguides 3a and 3b of a branching filter 3 directly. An intermediate frequency circuit section is separated from the sections 11a, 11b, 12a and 12b and located as a unit 13. Thus, the shield construction of the intermediate frequency circuit can be simplified. The increment of the signal loss through the separation can be canceled with the output increment through the replacement of an oscillator and a resonator of the circuit sections 11a, 11b, 12a and 12b as the dielectric oscillator and the dielectric resonator. |
