Adaptive Microwave Filters and Multiplexers for Communication Systems

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The use of multi-band microwave systems is increasing, especially for cellular networks. Many cell phones today can transmit different types of coded signals over multiple frequency bands. Radio frequency filters are essential devices in the communication of these signals. With a proper multi-band filter design, a two terminal device can be made that performs the needed filtering for the multiple frequency bands used by a cell phone or by base stations. This reduces the amount and total size of the filters and eliminates the need for switches and multiple chip sets for each type of transmitted signal.