volume | PIER Journals

Abstract

In this research, a simple design with a compact size of a triple-band bandpass filter (BPF) based on SIW is proposed. The proposed design consists of a main SIW cavity combined with two others-secondary SIW cavities. The three passbands of the proposed BPF are formed based on the center frequencies (CFs) of the four modes given by the main SIW cavity and two transmission poles (TP₁ and TP₂) achieved with the secondary SIW cavity. The SIW modes achieved with the main SIW cavity are TE₁₀₁, TE₂₀₁, and TE₃₀₁ addition to the suppressed mode, and those modes are realized by the perturbation of seven metallic vias. The coupling of the TP₁ with the suppressed mode realizes the first passband of the filter proposed with a bandwidth of 0.53 GHz. Vertical CPW slots are etched at the main SIW cavity for coupling TE₁₀₁ and TE₂₀₁ to form the second passband with a bandwidth of 1.3 GHz. Horizontal CPW slots are etched in the two rectangular secondary SIW cavities to join the TP₂ with TE₃₀₁ mode for realizing the third passband with a bandwidth of 1.2 GHz. Finally, an adjustable bandwidth filter with CFs of 6.9/10.1/13.3 GHz, respectively, has been achieved. Also, six transmission zeros (TZs) are achieved in the operation frequency range (6-16 GHz), which improves the selectivity of the filter. The proposed filter is modeled with an approximate equivalent circuit, and the prototype of the filter is fabricated and tested to demonstrate its excellent performance. A good agreement was realized among simulation, equivalent circuit LC model, and measurement S-parameters, which proves and validates the operation of the proposed triple-band BPF. The multiple advantages of the proposed filter, such as a simple structure, compactness (1.29λ_g × 1.62λ_g), selectivity, and high performance, make it a promising candidate for multi-tasking communication systems.

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Dr. Obaida Oulad Haddar

Prof. Mohammed Boulesbaa

Dr. Tarek Djerafi