Abstract—This paper presents a novel approach for designing compact and ultra wideband filter with independently controlled central frequencies. The structure consists of a microstrip line and two defected ground structure cells that are imbedded together. Each of the cells results in respective passband, outer cell for the first passband and inner one for the second passband. By changing dimensions of the resonators the central frequency of two passbands can be independently regulated in a wide range. Several attenuation polls in the stopband are realized that improve the isolation between two passbands. A 1.8GHz, 3.3GHz dual band filter is designed and simulated with fractional bandwidth of 43% and 15%.
Index Terms—Dual band, defected ground structure, bandpass filter, microstrip, wideband
The authors are with the Department of Electrical Engineering of Iran University of Science and Technology, Narmak, Tehran, 16846-1311, Iran (e-mail: email@example.com, firstname.lastname@example.org).
Cite: Maryam Jaldi and Majid Tayarni, "Design of Ultra Wideband Bandpass Dual Band Filter Using Defected Ground Structures," International Journal of Information and Electronics Engineering vol. 3, no. 1, pp. 59-62, 2013.