volume | PIER Journals

Abstract

In this letter, a compact passband filter with dual desirable attenuation narrow bands is developed for ultra wideband application. Indeed, a grounded stepped impedance resonator in defected microstrip structure (GSIR-DMS) is realized with a specified high pass cutoff frequency of (f GSIR ). Next, two cells of the designed GSIR-DMSs are cascaded to perform the proposed ultra wide passband filter. In addition, four λ_g/4 open-circuited stubs are inserted beside the GSIR-DMSs to create two transmission zeros and improve the filter rejection performance. In order to suppress interference with some expected network channels, two desirable λ_g/4 short-circuited microstrip stubs are implemented and coupled to the body of the UWB filter. Finally, the filter is constructed, simulated, and measured using a Rogers-ceramic RO4360 substrate with a permittivity of ε_r = 6.15 and a thickness of h = 1.016 mm. The filter responses from measurement and simulation are compared and discussed. The produced filter is very small covering circuit area of about (0.433λ_g × 0.244λ_g) excluding the feeding ports.

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doi:10.2528/PIERL23010502

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Dr. Raaed Thaaban Hammed

Dr. Hassan Saad Abdullah