A Relative Study on Half-Wavelength and Stepped Impedance Resonator based Microstrip Band-Pass Filter

In this paper an attempt is made to compare the electrical performance of two microstrip band-pass filters (BPF) designed using half-wavelength (λ/2) resonator and stepped impedance resonator (SIR). Coupled resonator-based design methodology is adopted to design the two BPFs. The BPFs have a fractional bandwidth of around 1.9 % at 4.195 GHz. The comparative study from simulated results shows that the BPF based on λ/2 resonator provides better insertion loss than the one based on SIR. On the other hand, SIR based BPF provides better spurious signal rejection and in-addition to miniaturization.