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Lossy microwave filter synthesis technique
Changsoo Kwak,Manseok Uhm,Inbok Yom IET 2012 Electronics letters Vol.48 No.4
<P>An easy and straightforward technique for the synthesis of lossy coupled-resonator filters is presented. A lossy filter designed by attachment of attenuators is transformed into a realisable lossy filter through linear operations of its admittance matrix and optimisations. This technique can synthesise lossy symmetric filters, asymmetric filters and different loss level filters.</P>
Automated Microwave Filter Tuning Using Curve Similarity and Weighted Least Squares
Changsoo Kwak,Manseok Uhm,Inbok Yom,Hyo Joon Eom IEEE 2012 IEEE microwave and wireless components letters Vol.22 No.10
<P>This letter presents an automated microwave filter tuning algorithm that emulates manual tuning. Measured S-parameter curve's shape similarity and value similarity with a target one are utilized for coarse tuning. A sensitivity matrix of S-parameter curve's feature points and a weighted least squares method are used for fine tuning. The utility of algorithm is demonstrated with an X-band four-pole dual-mode cavity filter.</P>
Electrical Design for Noise Suppression of High-Speed Digital Communication Links
Myunghoi Kim,Hongyeal Lee,Inbok Yom 한국정보통신학회 2016 2016 INTERNATIONAL CONFERENCE Vol.8 No.1
We propose an electrical design technique for noise-tolerant digital channels carrying multi-gigabit data. In the electrical layer of recent multi-gigabit digital channels, electrical imbalances between data channels induce a serious problem of electrical noises, thus degrading overall system performances. To suppress an electrical noise and improve a system performance, an impedance-controlled channel design is presented. By using a circuit simulation, the noise suppression of the proposed technique is demonstrated.
Full-band transition from substrate integrated waveguide to rectangular waveguide
Hongyeal Lee,Sohyeun Yun,Manseok Uhm,Inbok Yom IET 2015 Electronics letters Vol.51 No.14
<P>A novel substrate integrated waveguide to rectangular waveguide (RWG) transition for effective power transfer is proposed. The substrate taper is inserted into a conventional height-stepped impedance transformer of the RWG region to improve transmission loss and bandwidth. The transition is designed to cover the entire K-band (18-26 GHz), showing a return loss of 20 dB. A back-to-back transition has been fabricated to verify the proposed transition. The experimental results show good agreement with the analysis. The transmission loss of the stand-alone transition is 0.22 dB at 21.7 GHz with a usable bandwidth of 36%.</P>