Volume 7 Issue 1 - May 2016

  • 1. Design of defected ground low pass microstrip filters with enhanced performance characteristics

    Authors : Dheeraj Bhardwaj, Srishti Saraswat, Gitansh Gulati, Komal Sharma

    Pages : 736-741

    DOI : http://dx.doi.org/10.21172/1.71.105

    Keywords : DEFECTED GROUND STRUCTURE (DGS), STEPPED IMPEDANCE, LC LADDER, LOW PASS FILTER

    Abstract :

    Advancements in the field of RF/Microwave have triggered the designers to improve each and every component involved in microwave modern communication systems such as Low Noise Amplifier, Multiplier, Mixer, microwave filters, IF filters, antennas, power amplifier etc. In this paper we propose the design of microstrip lowpass filter using stepped-impedance (L-C ladder type) technique with the introduction of basic concept of defected ground structure (DGS) to achieve reduced size circuits. The designed prototype filter exhibits passband from frequency ranges, 0.1GHz-1.76 GHz which has been fabricated on 24.80 mm (L) X 16mm (W) FR4 substrate with 1.6m thickness The introduction of semi circular dumbbell shaped defected ground structure cell offers significant improvement of stopband attenuation and size reduction as can be seen. This lowpass filter can be used in wide variety of modern communication applications such as mobile broadcasting VHF band(174 MHz-240 MHz) and L band(1452 MHz-1492 MHz)GPS L1 band(1575 MHz) and L2 band(1227.6 MHz).

    Citing this Journal Article :

    Dheeraj Bhardwaj, Srishti Saraswat, Gitansh Gulati, Komal Sharma, "Design of defected ground low pass microstrip filters with enhanced performance characteristics", https://www.ijltet.org/journal_details.php?id=901&j_id=3124, Volume 7 Issue 1 - May 2016, 736-741, #ijltetorg