NOVEL COMPACT ULTRA-WIDEBAND FILTER WITH WIDE STOP-BAND

作者：Hu Hong Hong^*; Xiao Zhong Yin; He Wen Qing; Gao Shan

来源：Microwave and Optical Technology Letters, 2009, 51(1): 53-55.

DOI：10.1002/mop.24014

• ultra-wideband
• dual-mode resonator
• stub-loaded resonator
• bandpass filter

One novel compact ultra-wideband having high-frequency selectivity and wide stopband is developed by, using microstrip, stub-loaded dual-mode resonator couples. Open stub-loaded and short stub-loaded are used to widen the passband of filter without aperture-enhanced coupled line structure. Five transmission poles in the passband are shown. Two sharp attenuation poles call be located close to either side of the desired pass band. And the other two attenuation poles call be located in the stopband of upper frequencies, so as to reject the third resonant modes of stub-loaded resonators. The passband of filter and the locations attenuation poles call be controlled by the Sizes of the open stub and short stub. The measured results demonstrate that the insertion loss is lower than 1.0 dB in the passband (3.9-11.6 . GHz), higher than 15.0 dB in the upper-stopband (12.0-19.5 GH,), whereas the group delay variation in the passband is less than 0.5 ns. The measured result agrees well with the EM simulation.

• 出版日期2009-1
• 单位上海大学