| Title |
Narrow Band Coupled Resonator Filter Based on LTCC Processing Technology |
| Authors |
조학래(Hak-Rae Cho) ; 서수덕(Soo-Duk Seo) ; 구경헌(Kyung Heon Koo) |
| DOI |
https://doi.org/10.5573/ieie.2019.56.5.17 |
| Keywords |
narrow band filter ; LTCC process technology ; high blocking ; low insertion loss ; cross coupling structure |
| Abstract |
This paper has presented the design of a narrow band filter with less than 3% bandwidth and the filter order of 5, using a relatively low permittivity LTCC material. The cross-coupling principle is applied to improve the function and performance of the narrow band filter, and the blocking characteristics of the adjacent band have been enhanced. High blocking and low insertion loss characteristics are obtained by adding coupling structures between resonators that are not adjacent to each other. By adding a small strip line patch with an electromagnetic cross-coupling structure between the coupled resonators constituting the filter, the LTCC band pass filter is realized which can reduce the resonator-order and improve the blocking characteristics. In the fabrication process, Namics' 7251S electrode was printed twice in the LTCC filter structure using NH20M4 dielectric powder, and the best filter characteristics have been obtained. In this case, the dielectric constant of the material used in the design is 21.5, and the implemented size is 6×5×3 [mm3] for the 0.8 GHz band. |