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Band-Switchable Substrate-Integrated Waveguide Resonator and Filter
Lee, Boyoung,Koh, Beyoungyoun,Nam, Seunggoo,Lee, Tae-Hak,Lee, Juseop Professional Technical Group on Microwace Theory a 2018 IEEE transactions on microwave theory and techniqu Vol.66 No.1
<P>In this paper, we present a new band-switchable substrate-integrated waveguide (SIW) filter structure and its design method. The filter can have a passband either in <TEX>${S}$</TEX>- or <TEX>${X}$</TEX>-band, or have two passbands—one in <TEX>${S}$</TEX>-band and the other one in <TEX>${X}$</TEX>-band—at the same time. The presented design method allows us to obtain the bandwidths of two passbands independently. To verify the presented filter structure and design method, we have designed, fabricated, and measured three bandpass filters having three different pairs of bandwidths using frequency-tunable SIW resonators. By virtue of the frequency-tunable resonators, the filter can be continuously tuned in both frequency bands.</P>
Frequency-Tunable Filtering Power Divider With New Topology
Boyoung Lee,Beyoungyoun Koh,Seunggoo Nam,Tae-Hak Lee,Juseop Lee IEEE 2017 IEEE transactions on components, packaging, and ma Vol.7 No.7
<P>In this paper, we present a new frequency-tunable filtering power divider structure and its design method. For achieving the frequency filtering characteristic, the power divider uses a single resonator or multiple resonators. One of the unique features of the presented structure is that the last resonator is coupled to the two outputs, and this allows for minimizing the number of the resonators used in the power divider design. For verifying the presented structure and design method, we have designed filtering power dividers using frequency-tunable substrate-integrated resonators. It is shown that the operating frequency of the divider can be adjusted maintaining excellent impedance matching performance.</P>
$K$ -Band Substrate-Integrated Waveguide Filter Using TM21 Mode With Enhanced Stopband Attenuation
Lee, Boyoung,Nam, Seunggoo,Koh, Beyoungyoun,Lee, Juseop THE INSTITUTE OF ELECTRICAL ENGINEERS 2017 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS Vol.27 No.8
<P>In this letter, we present a method for enhancing the stopband attenuation performance of a K-band TM21 mode filter using substrate-integrated waveguide resonators. To improve the stopband response, we suppress and move spurious resonant peaks and produce transmission zeros. The step-by-step procedure of the proposed three-step method is shown in detail. The measurements show that when using the presented method, the filters exhibit better stopband performances than those in which the presented steps are not followed.</P>
Reconfigurable Bandpass Filter With Resonators in Cul-De-Sacs for Producing Notches
Seunggoo Nam,Boyoung Lee,Beyoungyoun Koh,Juseop Lee IEEE 2017 IEEE transactions on components, packaging, and ma Vol.7 No.9
<P>We present a new design method for bandpass filters capable of adjusting center frequencies, bandwidths, and notches. For designing such filters, filter topologies employing frequency-tunable resonators in cul-de-sacs are developed. The cul-de-sac resonators are mainly responsible for constructing notches, while the resonators in main paths form passbands. For verifying the presented design method, we have designed two bandpass filters. Each filter consists of two different resonator types: microstrip-line resonators for forming passbands and substrate-integrated waveguide resonators for producing notches. The measured results of the two designed filters show that frequency-tunable notches can be placed next to the passbands without producing unwanted resonant peaks that are usually observed in bandpass-bandstop filter cascades. This indicates that the filters designed using the presented topologies can replace bandpass-bandstop filter cascades.</P>
Boyoung Lee,Seunggoo Nam,Beyoungyoun Koh,Changsoo Kwak,Juseop Lee Professional Technical Group on Microwace Theory a 2015 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>In this paper, we present a K-band substrate-integrated waveguide resonator bandpass filter structure. The filter uses an antisymmetric mode of the resonator for the first time. A design method for the external coupling structure of the resonator utilizing the antisymmetric mode is described. In addition, a methodology for suppressing neighboring resonances close to the passband is demonstrated. This method can enhance stopband attenuation performance without additional loss. The proposed filter can tune the center frequency by adjusting tuning components. In order to verify the proposed filter structure and design method, we have fabricated and measured a K-band filter and demonstrated higher order filter design.</P>