A Compact Hairpin Filter with Stepped Hairpin Defected Ground Structure

Sajjad H., Altaf A., Khan S., Jan L.

21st International Multi Topic Conference, INMIC 2018, Karachi, Pakistan, 1 - 02 November 2018 identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/inmic.2018.8595634
  • City: Karachi
  • Country: Pakistan
  • Keywords: Bandpass Filter, Defected Ground Structures, Hairpin Filter, Insertion Loss
  • Istanbul Medipol University Affiliated: Yes


A compact hairpin line bandpass filter is presented with two different defected ground structures (DGS). The DGS are used to reduce the distributive response of the microstrip filter. The harmonic at 2 fo is suppressed to below -20 dB. The filter has an insertion loss (IL) greater than -3 dB and return loss (RL) of 26 dB at the center frequency, 2.4 GHz. The designed filter has a sharp roll-off and a wide band of operation. The filter is fabricated using RO4350 substrate and measured results are compared with the simulations.