SWITCHING FILTER MODULE FOR DYNAMICALLY SELECTING A MULTI-CHANNEL, SPECIALLY CONCERNED IN SIMULTANEOUSLY SELECTING CHANNELS HAVING GOOD RECEIVING SENSITIVITY

摘要

PURPOSE: A switching filter module for dynamically selecting a multi-channel is provided to reduce the number of filters necessary for selecting N channels by N, and to pass desired channels only while suppressing unnecessary frequency components, thereby reducing size of an RF module and maintaining a response performance. CONSTITUTION: An input signal of a switching module(212) is separated into the first path and the second path in the first node(218). A 2-way switch(214a) selects whether to pass a dual-channel selection filter(216a) for the first path signal, and connects the first path signal to an input portion or an output portion(second node 220) of the dual-channel selection filter(216a). The second node(220) is connected to a 3-way switch(214b). The 3-way switch(214b) selects whether to pass a dual-channel selection filter(216c) for a signal of the second node(220) or whether to supply the signal to a dual-channel selection filter(216d), and connects the signal of the second node(220) to an input portion(third node 222) or an output portion(first output node 226) of the dual-channel selection filter(216c) or an input portion(third node 224) of the dual-channel selection filter(216d). The dual-channel selection filter(216c) passes adjacent second channels and frequency bands only of the second channels, and outputs the signal to the first output node(226).