Theory for Pseudo-Butterworth Filter Response and Its Application to Bandwidth Tuning
- Authors
- Nam, Seunggoo; Lee, Boyoung; Lee, Juseop
- Issue Date
- 8월-2017
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Bandpass filter; Butterworth; substrate-integrated waveguide (SIW)
- Citation
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.65, no.8, pp.2847 - 2856
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
- Volume
- 65
- Number
- 8
- Start Page
- 2847
- End Page
- 2856
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/82641
- DOI
- 10.1109/TMTT.2017.2684096
- ISSN
- 0018-9480
- Abstract
- This paper presents a new class of filter responses called pseudo-Butterworth filter response. A detailed mathematical analysis on the pseudo-Butterworth response has been carried out. In addition, the comparison between the typical complete Butterworth response and the new pseudo-Butterworth response is provided. The theory for the pseudo-Butterworth filter response indicates that bandwidth tuning maintaining excellent return loss performance can be executed adjusting not all coupling structures of a filter. As an example, a bandwidth tuning method for a second-order filter is presented. For verifying the presented bandwidth tuning theory, a second-order substrateintegrated waveguide (SIW) resonator filter has been designed, fabricated, and measured. As an example of applications to higher order filters, a theory for the fourth-order pseudo-Butterworth responses and a bandwidth tuning method for the fourth-order filters have been developed. A fourth-order filter has also been fabricated and measured for verifying the presented bandwidth tuning technique.
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