A Compact Dual-Mode Dual-Band BPF Based Meander Square Resonator

A tunable dual-band dual-mode microwave bandpass filter (BPF) with compact size is suggested using meander stepped impedance square loop resonator (SIR). A new scheme exhibited miniaturization more than 58 % compared to Euclidean microstrip loop resonator. A small patch was attached in one corner of a square loop resonator to degenerate dual mode configurations. On the other hand, a step impedance technique was utilized to tune the second band of the suggested BPF. Dual mode dual band responses are located at the medical applications (2.45 GHz) with -40 dB as a return loss and two transmission zeroes for sharp skirt response as a first band and also a tunable band from (4-5 GHz) for LTE applications with return loss less than -10 dB as a second band. To validate this structure design and analysis, CST computer simulation package was used. The dual mode simulation results have been extracted and compared with the literature which finding closed to each other. So that, CST simulator certified and can be adopted it for extracting a tunable dual-band results which have been achieved using a mentioned simulator.