Dual band Stepped Impedance Interdigital Microstrip Filter for LTE Bands

Cavin Roger Nunes,Savio Sebastian Dias,Siddhi Suresh Parab,Varsha Shantaram Hatkar,William Johnson

doi:10.24018/ejers.2019.4.7.1407

Cavin Roger Nunes, Savio Sebastian Dias + Show 3 more

Open Access

https://doi.org/10.24018/ejers.2019.4.7.1407

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Abstract

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.

Highlights

Communication systems have developed tremendously since there was prompt development in the ultra-wideband systems, wireless internet like Wi-Fi and WiMAX, broadband personal communication systems and 3G, 4G technologies
defected ground structure (DGS) techniques have been implemented on a bandpass filter (BPF) structure to examine how the techniques impacts the result
Christopher James [10] developed a filter using single unit complementary split-ring resonators (CSRRs) and concluded that the band-pass frequency response is dependent on the physical dimensions of both the microstrip line and the CSRR structure

Summary

INTRODUCTION

Communication systems have developed tremendously since there was prompt development in the ultra-wideband systems, wireless internet like Wi-Fi and WiMAX, broadband personal communication systems and 3G, 4G technologies. Dual mode resonator usage allows to realize the compact high quality of bandpass filter (BPF) [1,2,3] Due to this rapid development, there was a need for more rigid and precise microwave components. Christopher James [10] developed a filter using single unit CSRR and concluded that the band-pass frequency response is dependent on the physical dimensions of both the microstrip line and the CSRR structure. Wei et al [12] presented a new design of multi-band bandpass filters employing stub loaded stepped-impedance resonator with defected microstrip structure (SL-SIR-DMS). In [13] an ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, to enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. This paper is organised as, Design of proposed filter is discussed in the section II, section III describes the structure of the filter, followed by discussion on results and analysis in section IV, and section V concludes the paper

DESIGN OF PROPOSED FILTER

STRUCTURAL DESCRIPTION

RESULTS AND DISCUSSION

CONCLUSION