K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses
This work is to present a versatile K-band waveguide resonator bandpass filter structure capable of producing various responses with a pair of transmission zeros. One of the significant features of the presented filter structure is its ability to produce very dissimilar responses through fine adjust...
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IEEE
2025-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10835056/ |
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| author | Sanggu Lee Jongheun Lee Boyoung Lee Jaehwan Lim Jaesub Han Juseop Lee |
| author_facet | Sanggu Lee Jongheun Lee Boyoung Lee Jaehwan Lim Jaesub Han Juseop Lee |
| author_sort | Sanggu Lee |
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| description | This work is to present a versatile K-band waveguide resonator bandpass filter structure capable of producing various responses with a pair of transmission zeros. One of the significant features of the presented filter structure is its ability to produce very dissimilar responses through fine adjustment of tuning screws without changing the geometries of the resonators and coupling structures. The versatility of the filter includes the ability to adjust the proximity of a pair of transmission zeros to the passband. In addition, its asymmetric responses can be laterally inverted by simply changing the resonant frequencies of the resonators without altering the coupling values of the coupling structures. The versatility of the filter can be attributed to the waveguide filter structure using the same type of coupling structures, inductive irises, and avoiding both negative couplings and cross couplings. For filter designs, this work presents a direct synthesis approach to finding the normalized coupling values from a prescribed canonical power transfer function containing a pair of transmission zeros without using numerical methods. One interesting feature is that there is an infinite number of synthesis results corresponding to a predefined response. The filter synthesis approach is demonstrated using examples of third- and fourth-order filters, each featuring a pair of transmission zeros. The versatility of the presented filter is illustrated by a fabricated fourth-order waveguide filter, tuned to produce, for example, three symmetric and four asymmetric responses. |
| format | Article |
| id | doaj-art-8b3fecbfc0e14e7fa535469abe0fbd91 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-8b3fecbfc0e14e7fa535469abe0fbd912025-01-21T00:01:50ZengIEEEIEEE Access2169-35362025-01-01138664867510.1109/ACCESS.2025.352754510835056K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric ResponsesSanggu Lee0https://orcid.org/0000-0002-8578-2958Jongheun Lee1https://orcid.org/0000-0002-0626-2429Boyoung Lee2Jaehwan Lim3Jaesub Han4Juseop Lee5https://orcid.org/0000-0002-9358-7597LIG Nex1, Yongin, Gyeonggi, South KoreaDepartment of Computer and Radio Communications Engineering, Korea University, Seoul, South KoreaKorea Electronics Technology Institute (KETI), Seongnam-si, South KoreaLIG Nex1, Yongin, Gyeonggi, South KoreaLIG Nex1, Yongin, Gyeonggi, South KoreaDepartment of Computer and Radio Communications Engineering, Korea University, Seoul, South KoreaThis work is to present a versatile K-band waveguide resonator bandpass filter structure capable of producing various responses with a pair of transmission zeros. One of the significant features of the presented filter structure is its ability to produce very dissimilar responses through fine adjustment of tuning screws without changing the geometries of the resonators and coupling structures. The versatility of the filter includes the ability to adjust the proximity of a pair of transmission zeros to the passband. In addition, its asymmetric responses can be laterally inverted by simply changing the resonant frequencies of the resonators without altering the coupling values of the coupling structures. The versatility of the filter can be attributed to the waveguide filter structure using the same type of coupling structures, inductive irises, and avoiding both negative couplings and cross couplings. For filter designs, this work presents a direct synthesis approach to finding the normalized coupling values from a prescribed canonical power transfer function containing a pair of transmission zeros without using numerical methods. One interesting feature is that there is an infinite number of synthesis results corresponding to a predefined response. The filter synthesis approach is demonstrated using examples of third- and fourth-order filters, each featuring a pair of transmission zeros. The versatility of the presented filter is illustrated by a fabricated fourth-order waveguide filter, tuned to produce, for example, three symmetric and four asymmetric responses.https://ieeexplore.ieee.org/document/10835056/Filter synthesisfilter topologymicrowave filtertransmission zeroswaveguide resonator |
| spellingShingle | Sanggu Lee Jongheun Lee Boyoung Lee Jaehwan Lim Jaesub Han Juseop Lee K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses IEEE Access Filter synthesis filter topology microwave filter transmission zeros waveguide resonator |
| title | K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses |
| title_full | K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses |
| title_fullStr | K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses |
| title_full_unstemmed | K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses |
| title_short | K-Band Waveguide Resonator Bandpass Filter Structure With Adjustable Transmission Zeros for Producing Various Symmetric and Asymmetric Responses |
| title_sort | k band waveguide resonator bandpass filter structure with adjustable transmission zeros for producing various symmetric and asymmetric responses |
| topic | Filter synthesis filter topology microwave filter transmission zeros waveguide resonator |
| url | https://ieeexplore.ieee.org/document/10835056/ |
| work_keys_str_mv | AT sanggulee kbandwaveguideresonatorbandpassfilterstructurewithadjustabletransmissionzerosforproducingvarioussymmetricandasymmetricresponses AT jongheunlee kbandwaveguideresonatorbandpassfilterstructurewithadjustabletransmissionzerosforproducingvarioussymmetricandasymmetricresponses AT boyounglee kbandwaveguideresonatorbandpassfilterstructurewithadjustabletransmissionzerosforproducingvarioussymmetricandasymmetricresponses AT jaehwanlim kbandwaveguideresonatorbandpassfilterstructurewithadjustabletransmissionzerosforproducingvarioussymmetricandasymmetricresponses AT jaesubhan kbandwaveguideresonatorbandpassfilterstructurewithadjustabletransmissionzerosforproducingvarioussymmetricandasymmetricresponses AT juseoplee kbandwaveguideresonatorbandpassfilterstructurewithadjustabletransmissionzerosforproducingvarioussymmetricandasymmetricresponses |