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H. Shaman and J.-S. Hong, “An Asymmetric Paral-lel Coupled Line for Notch Implementation in UWB Filters,” IEEE Microwave Theory and Wireless Component Letters, Vol. 17, No. 7, 2007, pp. 516-518. doi:10.1109/LMWC.2007.899314

has been cited by the following article:

• TITLE: Development of Hexagonal MMR Based UWB Bandpass Filter with 5 GHz Notch Band

  AUTHORS: Kaliyavarathan Thirumalaivasan, Rangaswamy Nakkeeran

  KEYWORDS: Ultra-Wideband, Mmr, Bandpass Filter, Notch Band, Narrowband, Microstrip

  JOURNAL NAME: Journal of Electromagnetic Analysis and Applications, Vol.3 No.8, August 2, 2011

  ABSTRACT: This paper presents an experimental verification of ultra-wideband bandpass filter (BPF) for UWB applications and notch filter in order to suppress 5 GHz narrowband service when it coexists with UWB radio system. The BPF consists of a hexagonal shaped multiple mode resonator (MMR) with interdigital coupling at both sides. Notch filter is derived from BPF by introducing four embedded open stubs near by the MMR. The developed BPF has insertion loss of –2 dB and the minimum return loss about –35 dB, while for the notch filter they are –3 dB and –40 dB respectively. The group delay obtained for bandpass filter is below 0.2 ns and for notch filter, it is about 0.3 ns. With the above structural features the overall dimensions of the filter is 38 mm (length) × 3.2 mm (breadth) × 1.6 mm (height) and the percentage fractional bandwidth (FBW) of the proposed filter is about 120.48%.