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S. R. Chandler, I. C. Hunter and J. G. Gardiner, “Active Varactor Tunable Bandpass Filter,” IEEE Microwave and Guided Wave Letters, Vol. 3, No. 3, 1993, pp. 70-71. doi:10.1109/75.205668

has been cited by the following article:

• TITLE: A Novel Compact Microstrip Elliptical Patch Resonator Filter with Tunable Bandwidth

  AUTHORS: Ruwaybih Alsulami, Heather Song

  KEYWORDS: Elliptical Patch; Bandpass Filter; Tunable Bandwidth; Microstrip Resonator; Flexible Filter

  JOURNAL NAME: Journal of Electromagnetic Analysis and Applications, Vol.5 No.2, February 28, 2013

  ABSTRACT: A novel elliptical patch resonator for a compact bandpass filter with tunable bandwidth is presented. This bandpass filter has the advantage of great flexibility in which the center frequency can be changed easily. The bandwidth of this filter can be modified by simply changing one variable, and this makes the proposed design unique. The order of the elliptical patch resonator can be increased, and three types of different orders of the same design are compared. The proposed filter can be used for future compact advanced wireless communication systems.