Design and analysis of novel DGS-loaded low-pass filter with wide stopband

Arican G. O., KANBAZ İ., Noamadeh Z., AKSOY E.

Frequenz, cilt.77, sa.7-8, ss.357-364, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 77 Sayı: 7-8
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1515/freq-2022-0168
  • Dergi Adı: Frequenz
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Applied Science & Technology Source, Compendex, INSPEC, RILM Abstracts of Music Literature
  • Sayfa Sayıları: ss.357-364
  • Anahtar Kelimeler: defected ground structure (DGS), interdigital resonators, microwave filters, wireless communication, Low pass filter (LPF)
  • Gazi Üniversitesi Adresli: Evet

Özet

© 2023 Walter de Gruyter GmbH, Berlin/Boston 2023.This article deals with design and development of a novel 7th order low-pass filter with defected ground structures for S-band applications. The proposed LPF structure was comprised of dumbbell shaped interdigital defected ground structures and open stubs as series inductor and shunt capacitor in the pass band. In addition, an equivalent circuit model was derived and optimized to achieve a 3-dB cut off frequency about 4 GHz with a reflection coefficient of better than -20 dB. Moreover, proposed low-pass filter was manufactured on a Rogers RO4003C substrate with a dielectric constant of 3.38, the dissipation factor of 0.0027. The developed LPF has a very flat pass-band with a transmission coefficient less than -0.5 dB and the measured transmission coefficient better than -18 dB in the passband (DC-3.6 GHz). Meanwhile, the prototype has a 20 dB harmonic suppression level in the frequency range from 5.54 GHz up to 43.5 GHz. Furthermore, the measured peak to peak group delay variation was less than 170 ps in the passband. The proposed filter has a very compact size of 195.3 mm2.