Abstract
Two compact low-temperature co-fired ceramic (LTCC) wideband bandpass filters using coupled lines with open/shorted stubs are proposed in this paper. Two conventional coupled lines with open/shorted stubs are used to increase the passband order for the wideband filters. Two independent transmission zeros realized by the open/shorted coupled lines are used to further improve the passband selectivity and harmonic suppression. Due to the 3-D LTCC circuit, the coupled lines and stubs can be located at different layers to overcome the large circuit size. Two fifth-order wideband LTCC bandpass filters centered at 3.1 GHz with multiple transmission zeros are designed and fabricated for verification. The theoretical and measured results are in good agreement and show good in-band performances.
| Original language | English |
|---|---|
| Article number | 7865973 |
| Pages (from-to) | 602-609 |
| Journal | IEEE Transactions on Components, Packaging and Manufacturing Technology |
| Volume | 7 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2017 |
Funding
This work was supported in part by the National Natural Science Foundation of China under Grant 6140010914 and Grant 61571231, in part by the Natural Science Foundation of Jiangsu Province under Grant BK20140791, and in part by the 2014 Zijin Intelligent Program of Nanjing University of Science and Technology. Recommended for publication by Associate Editor S. Roy upon evaluation of reviewers' comments.
Research Keywords
- Bandpass filter
- coupled lines
- low-temperature co-fired ceramic (LTCC)
- open/shorted stubs
- wideband
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