TY - JOUR
T1 - Contactless Tuning Plunger and its Application to K-Band Frequency-Tunable Cavity Filter
AU - Nam, Seunggoo
AU - Lee, Boyoung
AU - Kwak, Changsoo
AU - Lee, Juseop
N1 - Funding Information:
Manuscript received August 14, 2018; revised January 7, 2019; accepted March 21, 2019. Date of publication May 15, 2019; date of current version July 1, 2019. This work was supported in part by the Korea Government (MSIT) through the National Research Foundation of Korea under Grant NRF-2018R1A2B6006095 and in part by the Institute for Information and Communications Technology Promotion (IITP) through the Ministry of Science and ICT (Development of Flexible Payload Technologies for Next Satellite Broadcasting and Communications) under Grant 2014-0-00031. (Corresponding author: Juseop Lee.) S. Nam, B. Lee, and J. Lee are with Korea University, Seoul 02841, South Korea (e-mail: juseoplee@gmail.com).
Publisher Copyright:
© 1963-2012 IEEE.
PY - 2019/7
Y1 - 2019/7
N2 - In this paper, we present a frequency-tunable constant-bandwidth waveguide filter structure with contactless tuning plungers. For the purpose of adjusting the center frequency of the filter, we, for the first time, developed the contactless plungers of waveguide corrugation structure. The new plungers do not require any electrical and mechanical contacts with the waveguide circular resonators, and this allows the plungers to move freely. Although each plunger does not have electrical and mechanical contacts with each resonator, its {Q} -factor is comparable to a conventional resonator with no openings. We have also developed a design method for a frequency-tunable waveguide filter capable of having a constant absolute bandwidth. The tuning plungers are used only for the resonators, and the coupling structures are designed to be static in order to minimize the number of tuning devices. For demonstration, a fourth-order waveguide filter has been designed, fabricated, and measured. The measurement shows that it can be tuned from 19.00 to 19.48 GHz having the absolute bandwidth of 54.5 ± 2.5 MHz.
AB - In this paper, we present a frequency-tunable constant-bandwidth waveguide filter structure with contactless tuning plungers. For the purpose of adjusting the center frequency of the filter, we, for the first time, developed the contactless plungers of waveguide corrugation structure. The new plungers do not require any electrical and mechanical contacts with the waveguide circular resonators, and this allows the plungers to move freely. Although each plunger does not have electrical and mechanical contacts with each resonator, its {Q} -factor is comparable to a conventional resonator with no openings. We have also developed a design method for a frequency-tunable waveguide filter capable of having a constant absolute bandwidth. The tuning plungers are used only for the resonators, and the coupling structures are designed to be static in order to minimize the number of tuning devices. For demonstration, a fourth-order waveguide filter has been designed, fabricated, and measured. The measurement shows that it can be tuned from 19.00 to 19.48 GHz having the absolute bandwidth of 54.5 ± 2.5 MHz.
KW - Frequency tunable filter
KW - gap waveguide
UR - http://www.scopus.com/inward/record.url?scp=85068484082&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2019.2913931
DO - 10.1109/TMTT.2019.2913931
M3 - Article
AN - SCOPUS:85068484082
SN - 0018-9480
VL - 67
SP - 2713
EP - 2719
JO - IEEE Transactions on Microwave Theory and Techniques
JF - IEEE Transactions on Microwave Theory and Techniques
IS - 7
M1 - 8715808
ER -