New filter type suitable for miniature printed bandpass filters at RF & microwave frequencies

The paper presents a new concept of bandpass filters with capacitive coupled resonators applied for realization of printed filters at various microwave and RF frequencies. The filter´s design process is very easy due to its simple configuration, while its compact size makes it suitable for integration within various RF and microwave subsystems. Four filters with center frequencies of 380 MHz, 1.270 GHz, 5.3 GHz, and 14 GHz were designed, realized, and measured. In all cases the agreement between the predicted and measured results is excellent.