论文信息 - A novel cross-shape DGS applied to design ultra-wide stopband low-pass filters

A novel cross-shape DGS applied to design ultra-wide stopband low-pass filters

This letter presents a novel low-pass filter with an ultra-wide stopband. The proposed filter is comprised of a new cross-shape defected ground structure (CSDGS). By using this structure, the filter not only supports conventional DGS performances with a sharp rejection, but also exhibits an ultra-wide stopband. For the deigned low-pass filter, an insertion loss of less than 2dB from dc to 3.5GHz and the rejection is better than 20dB from 4.3 to 15.8GHz. Predicted performances show widened and deepened stopband beyond the low passband. Furthermore, it is confirmed by measurement.

[1] Tatsuo Itoh,et al. Novel 2-D photonic bandgap structure for microstrip lines , 1998 .

[2] Carlos del Río Bocio,et al. EBG at microwave frequency range: Bragg and/or resonant effect? , 2004 .

[3] Kai Chang,et al. Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators , 2003 .

[4] Tatsuo Itoh,et al. Simulation and experiment of photonic band-gap structures for microstrip circuits , 1997, Proceedings of 1997 Asia-Pacific Microwave Conference.

[5] T. Lopetegi,et al. Analysis and design of periodic structures for microstrip lines by using the coupled mode theory , 2002, IEEE Microwave and Wireless Components Letters.

[6] Hai W. Liu,et al. A novel fractal defected ground structure and its application to the low‐pass filter , 2003 .

[7] Rong Qian,et al. A Wideband EBG Structure with 1D Compact Microstrip Resonant Cell , 2005 .

[8] Jae-Bong Lim,et al. A novel 1-D periodic defected ground structure for planar circuits , 2000 .

[9] Yee Hui Lee,et al. A tapered small‐size EBG microstrip bandstop filter design with triple EBG structures , 2005 .

[10] Jong-Chul Lee,et al. Compact microstrip stepped-impedance hairpin resonator low-pass filter with aperture , 2005 .

[11] Jen-Tsai Kuo,et al. Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth , 2003 .