J.-K. Lee and Y. S. Kim, “Ultra-Wideband Bandpass Filter with Improved Upper Stopband Performance Using Defect Ground Structure,” IEEE Microwave and Wireless Components Letters, Vol. 20, No. 6, 2010, pp. 316-318. doi:10.1109/LMWC.2010.2047469

has been cited by the following article:

• TITLE: Development of Compact Ultra-Wideband (UWB) Microstrip Bandpass Filter

  AUTHORS: Kaliyavarathan Thirumalaivasan, Rangaswamy Nakkeeran

  KEYWORDS: Ultra-Wideband, Microstrip, Bandpass Filter, Multiple Mode Resonator, Group Delay

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

  ABSTRACT: Miniaturized Ultra-Wideband (UWB) microstrip bandpass filter with wide passband is presented. The filter is developed based on modified multiple mode resonator, which is formed by transversely attaching three pairs of non-uniform and folded stubs with lowpass and highpass sections. Both sides of high-impedance section are linked with two feed lines via direct coupled lines, resulting UWB bandpass filter. The designed filter provides 7 GHz passband between 2.5 and 9.5 GHz with approximately, –0.5 dB insertion loss, –35 dB minimum return loss at 6.85 GHz, linear phase over the passband and 110% of fractional bandwidth at –3 dB. The computed group delay variation in the passband for the filter is 0.02 ns. The overall dimension of the filter is 10.7 mm (length) × 3 mm (width) × 1.6 mm (thickness).