| 摘要 |
PURPOSE:To reduce manufacturing man-hours and the cost by arranging and fixing a transmission filter for a radio equipment in series while clipping a part to be a cut-off waveguide to a transmission frequency or a reception frequency to eliminate a partition wall of a case for a transmission and receiving branching filter and simplify the filter. CONSTITUTION:In order to take the isolation between a transmission filter 2 and a reception filter 3 arranged and fixed in parallel, e.g., 100dB or over, the partition wall sectioning the two filters is manufactured in incorporated structure with a case 15 containing the filters, and the case, the partition wall and a cover are fixed by lots of screws. For example, the transmission filter 2 and the reception filter 3 are arranged and fixed in series with a space of the case 15 cut out of an aluminum lamp. In this case, an aperture 16 is formed between an end opposite to a connector 7 of the reception filter 3 and an end of a space accommodating the reception filter. A transmission wave leaked from the transmission filter cannot be propagated toward the reception filter from the aperture 16 and the partition between the transmission filter and the reception filter is not required. |
