TY - JOUR
T1 - Arbitrary-order distributed-element narrowband reflectionless bandstop filter with canonical transmission response and broadband matching
AU - Lee, Jongheun
AU - Lee, Juseop
N1 - Funding Information:
Manuscript received June 10, 2020; accepted June 27, 2020. Date of publication July 31, 2020; date of current version October 5, 2020. This work was supported by the National Research Foundation of Korea (NRF) through the Korea Government (MSIT) under Grant NRF-2018R1A2B6006095. (Corresponding author: Juseop Lee.) The authors are with the Department of Computer and Radio Communications Engineering, Korea University, Seoul 02841, South Korea (e-mail: juseoplee@gmail.com).
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2020/10
Y1 - 2020/10
N2 - In this article, we present a rigorous design method for a symmetric reflectionless bandstop filter with coupled lines. Analytic design equations and the detailed procedure for formulating narrowband reflectionless bandstop filter structures are given in this article. The presented design theory allows us to design a symmetric reflectionless bandstop filter with a predefined transmission response and an excellent impedance matching performance over a wide frequency range. Using the circuit formulation process with the closed-form design equations presented in this article, all circuit element values and the detailed physical dimensions of a filter can be obtained in a straightforward manner. In order to verify the design equations and the filter structure, a third-order Butterworth filter example has been designed, fabricated, and measured. Overall, the return loss was measured to be larger than 10 dB over a wide frequency range from dc to 4f{0} ( f{0} : center frequency).
AB - In this article, we present a rigorous design method for a symmetric reflectionless bandstop filter with coupled lines. Analytic design equations and the detailed procedure for formulating narrowband reflectionless bandstop filter structures are given in this article. The presented design theory allows us to design a symmetric reflectionless bandstop filter with a predefined transmission response and an excellent impedance matching performance over a wide frequency range. Using the circuit formulation process with the closed-form design equations presented in this article, all circuit element values and the detailed physical dimensions of a filter can be obtained in a straightforward manner. In order to verify the design equations and the filter structure, a third-order Butterworth filter example has been designed, fabricated, and measured. Overall, the return loss was measured to be larger than 10 dB over a wide frequency range from dc to 4f{0} ( f{0} : center frequency).
KW - Absorptive filter
KW - reflectionless filter
UR - http://www.scopus.com/inward/record.url?scp=85092579873&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2020.3011164
DO - 10.1109/TMTT.2020.3011164
M3 - Article
AN - SCOPUS:85092579873
VL - 68
SP - 4381
EP - 4389
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
SN - 0018-9480
IS - 10
M1 - 9153911
ER -