Fig 1.
Schematic of the adopted SIR approach in this study.
Fig 2.
Microstrip resonator transformation; (a) The classical square loop resonator reported in [7] and (b) Stepped impedance square loop resonator that adopted in the planned filter of this study.
Fig 3.
The configuration of stepped impedance square loop resonator bandpass filter.
Fig 4.
The transmission and return loss responses of the designed bandpass filter.
Fig 5.
S21 responses of proposed bandpass filter as a function of d.
Fig 6.
S11 responses of the proposed bandpass filter as a function of d.
Table 1.
The electrical parameters of the proposed filter with respect to d magnitudes.
Fig 7.
The phase response of the proposed bandpass filter.
Fig 8.
Current intensity distribution of stepped impedance square loop resonator bandpass filter with perturbation element at 5.8 GHz.
Fig 9.
Current intensity distribution of stepped impedance square loop resonator bandpass filter without perturbation element at 5.8 GHz.
Fig 10.
The fabricated bandpass filter snapshot.
Fig 11.
Simulated and experimental S21 responses.
Fig 12.
Simulated and experimental S11 responses.
Table 2.
Comparison of the simulation and experimental results for the proposed filter.
Table 3.
Comparison of the experimental results for the proposed filter with reported filters in [20] and [21] at 5.8 GHz center frequency.