DESIGN OF TRIPLE-BAND MICROSTRIP FILTER WITH TRANSMISSION ZEROS USING OPEN STUBS

作者：Chen, J.; Chen, J. -Z.; Wu, B.; Zhang, Y. L.; Liang, C. -H.

来源：Journal of Electromagnetic Waves and Applications, 2012, 26(4): 525-534.

DOI：10.1163/156939312800030604

• COMPACT DUAL-BAND
• MICROWAVE FILTERS
• RESONATORS

In this paper, a novel triple-band microstrip filter with improved out-of-band suppression is presented. The theoretical design of triple-band filter is based on frequency transformation method, which is then realized by a group of triple-band resonators as the building block of the filter. Two open stubs with different lengths are loaded directly in the middle of two resonators to introduce a pair of transmission zeros, which achieves high out-of-band suppression filtering response with no need of cross-coupling. To validate the method, a practical triple-band filter with pass-bands at 3.3-3.4GHz, 3.5-3.6GHz, 3.7-3.8GHz and transmission zeros at 3.1GHz, 4GHz is designed and fabricated.

• 出版日期2012
• 单位西安电子科技大学