earticle

영어

A microstrip dual-band bandpass filter (DBPF) with controllable bandwith is designed and simulated at 3.08 GHz and 7.05 GHz. A step impedance resonator (SIR) with open stubs and the shunt open stub is employed that consists in a pair has advantage of having a compact and excellent transmission characteristics. The 3 dB bandwidth of a first band is 950 MHz with the insertion loss (S21) of -0.2dB and the second bandwidth is 1400 MHz with the insertion loss (S21) of -0.7dB. This bandpass filter can be applied to the domestic and international fixed and mobile satellite telecommunications, fixed meteorological satellite, ultra-wideband(UWB), and broadcast relay, The overall size of bandpass filter is 15 mm × 20 mm.