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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2017-03-21
Design of Low-Pass Filter Using Meander Inductor and U-Form Hi-LO Topology with High Compactness Factor for L-Band Applications
By
Wael Abd Ellatif Ali,

    Dr. Wael Abd Ellatif Ali

    Department of Electronics and Communications Engineering, College of Engineering

    Arab Academy for Science, Technology and Maritime Transport (AASTMT)

    Egypt

    Homepage

Ahmed Boutejdar

    Dr. Ahmed Boutejdar

    Microwave and Communication Engineering

    German Research Fondation DFG

    Germany

    Homepage

Progress In Electromagnetics Research M, Vol. 55, 95-107, 2017
doi:10.2528/PIERM17013103 | Google Scholar

Abstract
In this paper, novel compact low-pass filters using Hi-Lo technique and meander method are proposed. Series of the proposed filters are designed by adding modifications along the microstrip line (meander inductor) and by using U-form topology. The size of the proposed filter can be reduced by 15% compaired to the conventional filter while maintaining the optimal low-pass features. The compact meander LPF consists of two thin microstrip lines, which are connected with 50Ω microstrip feed lines and a microstrip patch placed in the middle of the structure. The thin lines and the microstrip patch correspond to inductance and capacitance, respectively. The proposed meander Hi-Lo topology has been mounted on an RO4003 substrate with a relative dielectric constant εr = 3.38, thickness h = 0.813 mm and loss tangent 0.0027. The compact L-band low-pass structure has a size of (0.263λg×0.175λg) where λg = 57 mm is the wavelength at the cutoff frequency 2.85 GHz. In addition to a good compactness, the structure exhibits a simple design, very low insertion loss in the passband (L-band) of less than 0.3 dB, and it achieves a wide rejection bandwidth with a 20 dB attenuation from 5.3 to 6.3 GHz. The excellent LPF characteristics are verified through simulations and measurements where a good consistency can be observed. Such compact filter structures are expected to be used in various microwave system applications.
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Citation
Wael Abd Ellatif Ali, and Ahmed Boutejdar, "Design of Low-Pass Filter Using Meander Inductor and U-Form Hi-LO Topology with High Compactness Factor for L-Band Applications," Progress In Electromagnetics Research M, Vol. 55, 95-107, 2017.
doi:10.2528/PIERM17013103
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