A miniaturized substrate integrated waveguide (SIW) bandpass filter using fractal open complementary split-ring resonators (FOCSRRs) unit-cell is proposed. The proposed structure is realized by etching the proposed FOCSRR unit-cells on the top metal surface of the SIW structure. The working principle of the proposed filter is based on the evanescent-mode propagation. The proposed FOCSRRs behave as an electric dipoles in condition of the appropriate stimulation, which are able to generate a forward-wave passband region below the cutoff frequency of the waveguide structure. Since, the electrical size of the proposed FOCSRRs unit-cell is larger than the conventional OCSRRs unit-cell; therefore, the FOCSRR unit-cell is a good candidate to miniaturize the SIW structure. The proposed filter represents high selectivity and compact size because of the utilization of the sub-wavelength resonators. The introduced filter is simulated by a 3D electromagnetic simulator. In order to validate the ability of the proposed topology in size reduction, 1- and 2-stage of the proposed filters have been fabricated based on the standard printed circuit board process. The measured S-parameters of the fabricated filters are in a good agreement with the simulated ones. The proposed SIW filters have many advantages in term of compact size, low insertion loss, high return loss, easy fabrication and integration with other circuits. It is the first time that the FOCSRR unit-cells were combined with the SIW structure for miniaturization of this structure. Furthermore, a wide upper-stopband with the attenuation >20 dB in the range of 3–8 GHz is achieved. The results show that, a miniaturization factor about 75.5% has been obtained.
کلید واژگان :electric dipoles, evanescent-mode, fractal open complementary split-ring resonators (FOCSRRs), miniaturization, substrate integrated waveguide
ارزش ریالی : 600000 ریال
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