Summary
URSI Commission B 2013 International Symposium on Electromagnetic Theory EMTS 2013
2013
Session Number:21PM1F
Session:
Number:21PM1F-05
Design of miniaturized narrow band filter to consider with cross-coupling effect
Tamio Kawaguchi, Noritsugu Shiokawa, Kohei Nakayama, Mutsuki Yamazaki, Hiroyuki Kayano,
pp.234-237
Publication Date:2013/5/20
Online ISSN:2188-5079
DOI:10.34385/proc.30.21PM1F-05
Summary:
We have developed a high-temperature superconducting (HTS) receiving filter with narrow bandwidth characteristic for 2 GHz band mobile communication systems. To reduce the filter size and controlled unintended cross coupling, we proposed a stepped impedance resonator (SIR) and separation filter package. This resonator is possible to control the amount of electric coupling and magnetic coupling by changing the length or width the resonator structure. Therefore, the gap between the adjacent resonators can be achieved more compact size. The developed narrow band HTS filter with a fractional bandwidth of 0.25% has 10-pole quasi-elliptic function response for sharp skirt characteristic. This filter separated two packages to reduce unintended cross coupling, and mounted in the front end systems combining this filter together with low-noise amplifier. The measured frequency response agrees reasonably with the desired specifications.