Bandwidth tuning of resonator filter using reduced number of tunable coupling structures

Boyoung Lee; Seunggoo Nam; Juseop Lee

doi:10.1109/TMTT.2019.2898860

Bandwidth tuning of resonator filter using reduced number of tunable coupling structures

Boyoung Lee, Seunggoo Nam, Juseop Lee

Department of Computer Science and Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

This paper presents a new bandwidth tuning theory for Butterworth-response resonator filters. The presented theory shows that the bandwidth of odd-order Butterworth filters can be varied by adjusting only two interresonator coupling structures while maintaining a perfect impedance matching at the center frequency. In other words, this paper presents an analytic approach to reduce the number of tunable coupling structures when designing a bandwidth-tunable resonator filter. Theories for third- A nd fifth-order direct-coupled filters are discussed in detail, and it is shown that only two interresonator coupling structures are required to be tunable. In addition, for verifying the new bandwidth tuning method, a fifth-order cylindrical cavity filter has been designed, fabricated, and measured. The fabricated filter has an 11:1 bandwidth tuning range.

Original language	English
Article number	8653495
Pages (from-to)	1496-1503
Number of pages	8
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	67
Issue number	4
DOIs	https://doi.org/10.1109/TMTT.2019.2898860
Publication status	Published - 2019 Apr

Keywords

Bandwidth tuning
cavity resonator
interresonator coupling
topology

ASJC Scopus subject areas

Radiation
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TMTT.2019.2898860

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title = "Bandwidth tuning of resonator filter using reduced number of tunable coupling structures",

abstract = "This paper presents a new bandwidth tuning theory for Butterworth-response resonator filters. The presented theory shows that the bandwidth of odd-order Butterworth filters can be varied by adjusting only two interresonator coupling structures while maintaining a perfect impedance matching at the center frequency. In other words, this paper presents an analytic approach to reduce the number of tunable coupling structures when designing a bandwidth-tunable resonator filter. Theories for third- A nd fifth-order direct-coupled filters are discussed in detail, and it is shown that only two interresonator coupling structures are required to be tunable. In addition, for verifying the new bandwidth tuning method, a fifth-order cylindrical cavity filter has been designed, fabricated, and measured. The fabricated filter has an 11:1 bandwidth tuning range.",

keywords = "Bandwidth tuning, cavity resonator, interresonator coupling, topology",

author = "Boyoung Lee and Seunggoo Nam and Juseop Lee",

note = "Funding Information: Manuscript received August 18, 2018; revised December 11, 2018; accepted January 2, 2019. Date of publication February 26, 2019; date of current version April 3, 2019. This work was supported by the Korea Government (Ministry of Science and ICT) through the National Research Foundation of Korea under Grant NRF-2018R1A2B6006095. (Corresponding author: Juseop Lee.) The authors are with the College of Informatics, Korea University, Seoul 02841, South Korea (e-mail: juseoplee@gmail.com). Publisher Copyright: {\textcopyright} 2019 IEEE.",

year = "2019",

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doi = "10.1109/TMTT.2019.2898860",

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AU - Lee, Boyoung

AU - Nam, Seunggoo

AU - Lee, Juseop

N1 - Funding Information: Manuscript received August 18, 2018; revised December 11, 2018; accepted January 2, 2019. Date of publication February 26, 2019; date of current version April 3, 2019. This work was supported by the Korea Government (Ministry of Science and ICT) through the National Research Foundation of Korea under Grant NRF-2018R1A2B6006095. (Corresponding author: Juseop Lee.) The authors are with the College of Informatics, Korea University, Seoul 02841, South Korea (e-mail: juseoplee@gmail.com). Publisher Copyright: © 2019 IEEE.

PY - 2019/4

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N2 - This paper presents a new bandwidth tuning theory for Butterworth-response resonator filters. The presented theory shows that the bandwidth of odd-order Butterworth filters can be varied by adjusting only two interresonator coupling structures while maintaining a perfect impedance matching at the center frequency. In other words, this paper presents an analytic approach to reduce the number of tunable coupling structures when designing a bandwidth-tunable resonator filter. Theories for third- A nd fifth-order direct-coupled filters are discussed in detail, and it is shown that only two interresonator coupling structures are required to be tunable. In addition, for verifying the new bandwidth tuning method, a fifth-order cylindrical cavity filter has been designed, fabricated, and measured. The fabricated filter has an 11:1 bandwidth tuning range.

AB - This paper presents a new bandwidth tuning theory for Butterworth-response resonator filters. The presented theory shows that the bandwidth of odd-order Butterworth filters can be varied by adjusting only two interresonator coupling structures while maintaining a perfect impedance matching at the center frequency. In other words, this paper presents an analytic approach to reduce the number of tunable coupling structures when designing a bandwidth-tunable resonator filter. Theories for third- A nd fifth-order direct-coupled filters are discussed in detail, and it is shown that only two interresonator coupling structures are required to be tunable. In addition, for verifying the new bandwidth tuning method, a fifth-order cylindrical cavity filter has been designed, fabricated, and measured. The fabricated filter has an 11:1 bandwidth tuning range.

KW - Bandwidth tuning

KW - cavity resonator

KW - interresonator coupling

KW - topology

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Bandwidth tuning of resonator filter using reduced number of tunable coupling structures

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Keywords

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