DESIGN AND SYNTHESIS OF CHAINED-RESPONSE MULTIBAND FILTERS

Given how important multiband filters are in the current era, little work seems to
have come up with methods that can produce multiband filters of more than two
passbands with flexibility in inner-band frequency selection, as well as specific
bandwidths for each passband. In this research, a novel method known as chainedresponse
for multiband filter is proposed. This method can produce multiband filters
with the flexibility to set the bandwidths for each passband as well as its inner-band
frequency selection. The theory of chained-response is developed where the filtering
function together with the coupling matrix is derived. Matrix rotation is then applied to
produce the suitable topology. In order to validate the feasibility of the approach, a
dual-band filter is designed, simulated and fabricated.