Dual band bandpass filter with individual tuning of band pass frequencies

A dual band bandpass filter is presented with individual tuning of each bandpass center frequency. This feature offers a significant improvement over previous designs. The two center frequencies are 1.1 GHz and 2.3 GHz and the tuning ranges are 60 MHz and 90 MHz and the insertion loss of the lower and upper center frequencies are better than 2.1 dB and 3.5 dB respectively.