TY - GEN
T1 - Topology and Rigorous Design Method for Reflectionless Bandstop Filter
AU - Lee, Jongheun
AU - Lee, Boyoung
AU - Nam, Seunggoo
AU - Lee, Juseop
N1 - Funding Information:
ACKNOWLEDGMENT This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2018R1A2B6006095).
Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. NRF-2018R1A2B6006095).
Publisher Copyright:
© 2019 European Microwave Association (EuMA).
PY - 2019/10
Y1 - 2019/10
N2 - A new filter topology for a second-order absorptive bandstop filter with Butterworth response is presented in this paper. Closed-form design equations for having a Butterworth transmission response and no reflection at all frequencies are also provided. Hence, an absorptive bandstop filter can be designed such that its transmission response is identical to the one of a conventional reflective filter. For verifying the presented filter topology and design formulas, an absorptive bandstop filter with 10% fractional bandwidth centered at 190 MHz has been designed, fabricated, and measured. The measurement shows that the fabricated filter has the return loss larger than 15 dB in the stopband and the Butterworth response in the power transmission.
AB - A new filter topology for a second-order absorptive bandstop filter with Butterworth response is presented in this paper. Closed-form design equations for having a Butterworth transmission response and no reflection at all frequencies are also provided. Hence, an absorptive bandstop filter can be designed such that its transmission response is identical to the one of a conventional reflective filter. For verifying the presented filter topology and design formulas, an absorptive bandstop filter with 10% fractional bandwidth centered at 190 MHz has been designed, fabricated, and measured. The measurement shows that the fabricated filter has the return loss larger than 15 dB in the stopband and the Butterworth response in the power transmission.
KW - Butterworth filter
KW - absorptive bandstop filter
KW - infinite return loss
UR - http://www.scopus.com/inward/record.url?scp=85076371951&partnerID=8YFLogxK
U2 - 10.23919/EuMC.2019.8910927
DO - 10.23919/EuMC.2019.8910927
M3 - Conference contribution
AN - SCOPUS:85076371951
T3 - 2019 49th European Microwave Conference, EuMC 2019
SP - 456
EP - 459
BT - 2019 49th European Microwave Conference, EuMC 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 49th European Microwave Conference, EuMC 2019
Y2 - 1 October 2019 through 3 October 2019
ER -