| 摘要 |
PURPOSE:To secure the duplex property only to the signal of specific frequency and the directional property to the TV signal respectively, by connecting the specific frequency duplex property generating element to one end of a transformer forming the branch element. CONSTITUTION:The sides (a) and (b) of the primary winding L1 of the transformer 11 forming a branching device are connected to the input and output terminals 8 and 9. The side (c) of the secondary winding L2 is connected to the branch terminal 10 with the side (d) earthed in a way of a high frequency. At the same time, the side (e) of the secondary winding L4 of the transformer 12 is connected to the terminal 8 with the side (f) earthed in a way of a high frequency. Furthermore the side (g) of the primary winding L3 is connected to the terminal 10 with the side (h) connected to the specific frequency duplex property generating element 16. The other end of the element 16 is earthed via the resistance element 13. In such constitution, the signal loss quantity of the terminal 10 is low regardless of the frequency in case when the signal is supplied through the terminal 8, and the signal loss of the terminal 10 is low only at the specific frequency band in case when the signal is supplied through the terminal 9 respectively. |
