Reconfigurable dual-band narrow bandpass filter using parallel two-section open stubs and z-domain technique

This paper proposes a z-domain technique to design a reconfigurable dual-band bandpass filter. An arbitrarily pre-defined bandpass filter is implemented by using parallel stubs. Switch circuits shunted with two-section stubs are employed to induce the narrow passbands on arbitrarily bandpass filters. The simulated results show that 3-dB bandwidths are 130 MHz and 70 MHz at the center frequencies of 1.55 GHz and 2.12 GHz, respectively.