A compact SIW bandpass filter using DMS-DGS structures for Ku-band applications
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Sådhanå (2020)45:244 https://doi.org/10.1007/s12046-020-01485-0
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A compact SIW bandpass filter using DMS-DGS structures for Ku-band applications BANU PRIYA ANNADURAI*
and UMMA HABIBA HYDER ALI
Department of Electronics and Communication Engineering, Sri Venkateswara College of Engineering, Anna University, Sriperumbudur 602117, India e-mail: [email protected] MS received 20 January 2020; revised 20 July 2020; accepted 16 August 2020 Abstract. This paper presents a design of compact SIW (substrate integrated waveguide) bandpass filter for application in Ku-band Transmit up-convert frequency (i.e., 13.7–14.1 GHz) used for satellite communications. Based on Defected Microstrip Structure-Defected Ground Structure combination (DMS-DGS), this SIW filter structure is designed to improve passband and stopband performance. By merging circular ring slot (CRS) with interdigital DGS, better passband characteristics with sharp stopband attenuation are obtained. To validate the design, the filter is fabricated using Rogers substrate. The size measures 23.8 mm 9 10 mm and operates at a center frequency of 13.9 GHz. Measured results of the filter agree well with the simulated results. Also, designed BPF filter has advantage of low insertion loss, better return loss, compact size and high stopband rejection. Keywords. Bandpass filter (BPF); defected ground structure (DGS); defected microstrip structure (DMS); substrate integrated waveguide (SIW); Ku-band.
1. Introduction Rectangular waveguides are used for transmitting signals between system modules with lower losses at high-frequency applications. Further, rectangular waveguides are huge and bulky. The technology gap between rectangular waveguides and other planar circuits is filled up by SIW (Substrate Integrated Waveguide). This has the benefit of mere integration into substrates and planar waveguide circuits specifically Printed Circuit Board process (PCB) and also SIW has the benefit of low-cost, low loss, compact and better quality factor. Literature has been reviewed for similar structures. Filter design for uplink path in Ku-band Up-Converter Block (BUC) is designed by traditional coupled waveguide cavities and different coupled line filter topologies [1]. A new SIW structure with better out of band rejection using a hollow substrate integrated coaxial line is reported [2]. However, the return loss is comparatively low. Hence, one side via hole SIW technique called Half-Mode Substrate Integrated Waveguide (HMSIW) is reported [3] to exhibit wide stopband, but the circuit size is extremely large. Circuit minimization can be achieved by another most important technique called Defected Ground Structure (DGS) has gained attractive attention among all other techniques to improve band-stop performance and to suppress higher order harmonics [4–6]. SIW filter utilizing *For correspondence
Complementary Split Ring Resonator (CSRRs) structure, which controls the passband of the filter over the dimensions of the split rin
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