Dual band Stepped Impedance Interdigital Microstrip Filter for LTE Bands



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Submitted Jun 27, 2019
Published Jul 17, 2019
10.24018/ejeng.2019.4.7.1407

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In this paper, a dual band microstrip bandpass filter has been proposed utilizing three edge coupled resonators, interdigital stubs and DGS technique. To enhance the coupling degree, two interdigital coupled feed lines are employed in this filter. The suppressing cell consists of stepped impedance ladder type resonators, which provides a wide stopband. The proposed suppressing cell has clear advantages like low insertion loss in the passband and suitable roll off. The frequency response of the filter looks like a standard dual band band-pass filter. The filter exhibits a dual passband with resonant frequencies at 2.2GHz and 3.45GHz covers LTE1 and LTE22 bands.

Keywords: Microstrip, Stepped Impedance, Interdigital stubs, DGS, CSRR.

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