| 摘要 |
PURPOSE:To realize a circuit connection with good impedance characteristics while preventing the coupling between the 1st and the 2nd local oscillators and improving shield effect by constituting a circuit part which operates in a high frequency band in a simple and easy-to-handle housing. CONSTITUTION:The housing 30a contains the 1st mixer part 13 and the 2nd mixer part 16, an opening part for connecting the input/output part of the band- pass filter of the 1st intermediate frequency amplifying circuit part is formed in one flank, and part of a printed wiring board 37a constituting said band-pass filter projects from the opening part. The printed wiring board 35a which is grounded in one surface and has the 1st mixer part 13 formed of a strip line including the 1st local oscillator 4 is stored in the housing 30a together with a shield plate 30c while facing a printed wiring board 36a which is grounded in one surface where the circuit is formed of a strip line across the 2nd mixer part 16' including the 2nd local oscillator 7, thereby clamping the input/output projection part 37a' of the printed wiring board 37a from both surfaces. |
