Vol. 104

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2022-05-11

Bandpass Filters Based on Hybrid Structure of Substrate Integrated Waveguide (SIW) and Hilbert Defected Ground Structure (HDGS)

By Mohammed El Amine Chaib, Mehadji Abri, Hadjira Abri Badaoui, and Nabil Cherif
Progress In Electromagnetics Research Letters, Vol. 104, 27-35, 2022
doi:10.2528/PIERL22032503

Abstract

In this article, two compact Substrate Integrated Waveguide (SIW) bandpass filters based on Defected Ground Structure (DGS) technology are proposed. Hilbert Cell of second orderis the resonator shape proposed for the DGS of both filters, where the first filter DGS consists of five pairs, and the second one uses only three pairs. The pair used in the first filter consists of two cells located side to side whereas they are placed face to face in the second filter. In order to enhance the performance of the second filter and based on the evanescent-mode technique, three other pairs of first order Hilbert cells are engraved on the top layer. Both band-pass filters are designed to operate in C band with a measured bandwidth of 1.8 GHz for the first filter and 0.86 GHz for the second one. The proposed structures have the same physical dimensions, which is 38.1 mm×16 mm with different measured insertion losses of -2.5 dB and -2.7 dB. Both structures exhibit an upper stopband rejection with attenuation around -20 dB and -29 dB, respectively. The filters operate in a transmission bandwidth of [5.5 GHz-7.3 GHz] and [5.27 GHz-6.13 GHz] with a fractional bandwidth (FBW) of 28.1% and 15.09% for the first filter and the second filter respectively. A good agreement is reported between the measured and simulated results.

Citation


Mohammed El Amine Chaib, Mehadji Abri, Hadjira Abri Badaoui, and Nabil Cherif, "Bandpass Filters Based on Hybrid Structure of Substrate Integrated Waveguide (SIW) and Hilbert Defected Ground Structure (HDGS)," Progress In Electromagnetics Research Letters, Vol. 104, 27-35, 2022.
doi:10.2528/PIERL22032503
http://www.jpier.org/PIERL/pier.php?paper=22032503

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