volume | PIER Journals

2019-06-03

Synthesis and Design of MMR-Based Ultra-Wideband (UWB) Band Pass Filter (BPF) in Suspended Stripline (SSL) Technology

Mohamad Assaf,

Dr. Mohamad Assaf

Higher Institute for Applied Sciences and Technology (HIAST)

Syria

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Adnan Malki,

Dr. Adnan Malki

Higher Institute for Applied Sciences and Technology (HIAST)

Syria

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Alaa Aldin Sarhan

Dr. Alaa Aldin Sarhan

Department of Communication

Higher Institute for Applied Sciences and Technology

Syria

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Progress In Electromagnetics Research Letters, Vol. 84, 123-130, 2019

doi:10.2528/PIERL19031602

Abstract

This paper presents a direct synthesis approach for UWB BPFs. The modified Chebyshev filtering function is used to characterize the frequency response over the whole frequency range of the BPF. As for the filter's circuit, open circuited MMR capacitively coupled with I\O ports is used, and two shunt short-circuited stubs are placed at the two ends of the connecting line to sharpen the rejecting skirt of the passband. The equivalent circuit's transfer function is derived. By equating the filtering function to the transfer function of the circuit, the design parameters are obtained. The uniform connecting line is then replaced by nonuniform line to suppress spurious harmonics and achieve very wide stopband. In order to avoid critical precision requirement in the fabrication of the filter, we design the filter using suspended stripline (SSL) technology to replace the parallel-coupled microstrip lines (PCML) with very small coupling gaps. Finally, a filter prototype is designed and fabricated to experimentally validate the presented method. Experimental results show good agreement with EM-simulated and theoretical ones.

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Mohamad Assaf, Adnan Malki, and Alaa Aldin Sarhan, "Synthesis and Design of MMR-Based Ultra-Wideband (UWB) Band Pass Filter (BPF) in Suspended Stripline (SSL) Technology," Progress In Electromagnetics Research Letters, Vol. 84, 123-130, 2019.
doi:10.2528/PIERL19031602

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