volume | PIER Journals

Abstract

This work presents a quintuple-mode wideband bandpass filter utilizing a cylinder cavity loaded with a metallic perturbation on each base and a gap between them. The cylindrical cavity is fed with two inline disk-loaded feeding lines placed in the middle of the cavity wall. Two inline shorting pins are placed orthogonally in the same feeding lines plane. The five resonant modes are: TM₀₁₁, TE₁₁₁, the degenerate modes of TE₂₁₁ and quasi-TE₃₁₁ excited by the pair of disk-loaded feeding lines and shorting pins. This combination allows the generation of two transmission zeros (TZs) out of the passband. The mode analysis and geometric configuration are well studied and presented in this work. The results of the quintuple-mode filter demonstrated a fractional bandwidth of 66.87% at a central frequency of 3.69 GHz with insertion loss 0.18 dB and return loss higher than 19.4 dB. The coupling matrix of the proposed filter is synthesized as a five-pole Chebyshev filter showing close alignment with the simulated results. Finally, the proposed bandpass filter is fabricated and measured for comparison. Close agreement is achieved between the simulated and measured results.

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Dr. Maha H. Elfeshawy

Professor Hany Fathy Hammad

Dr. Yasmine Abdalla Zaghloul