| 000 | 00000nam c2200205 c 4500 | |
| 001 | 000046048441 | |
| 005 | 20200921091551 | |
| 007 | ta | |
| 008 | 200706s2020 ulkad bmAC 000c eng | |
| 040 | ▼a 211009 ▼c 211009 ▼d 211009 | |
| 085 | 0 | ▼a 0510 ▼2 KDCP |
| 090 | ▼a 0510 ▼b 6YD36 ▼c 382 | |
| 100 | 1 | ▼a 남승구, ▼g 南承球 |
| 245 | 1 0 | ▼a Reconfigurable waveguide filter structure / ▼d Seunggoo Nam |
| 260 | ▼a Seoul : ▼b Graduate School, Korea University, ▼c 2020 | |
| 300 | ▼a xii, 138장 : ▼b 삽화, 도표 ; ▼c 26 cm | |
| 500 | ▼a 지도교수: 이주섭 | |
| 502 | 1 | ▼a 학위논문(박사)-- ▼b 고려대학교 대학원: ▼c 컴퓨터·전파통신공학과, ▼d 2020. 8 |
| 504 | ▼a 참고문헌: 장 127-138 | |
| 530 | ▼a PDF 파일로도 이용가능; ▼c Requires PDF file reader(application/pdf) | |
| 653 | ▼a Frequency tunable bandpass filter | |
| 776 | 0 | ▼t Reconfigurable Waveguide Filter Structure ▼w (DCOLL211009)000000232139 |
| 900 | 1 0 | ▼a Nam, Seung-goo, ▼e 저 |
| 900 | 1 0 | ▼a 이주섭, ▼e 지도교수 |
| 900 | 1 0 | ▼a Lee, Ju-seop, ▼e 지도교수 |
| 945 | ▼a KLPA |
소장정보
| No. | 소장처 | 청구기호 | 등록번호 | 도서상태 | 반납예정일 | 예약 | 서비스 |
|---|---|---|---|---|---|---|---|
| No. 1 | 소장처 과학도서관/학위논문서고/ | 청구기호 0510 6YD36 382 | 등록번호 123064850 | 도서상태 대출가능 | 반납예정일 | 예약 | 서비스 |
| No. 2 | 소장처 과학도서관/학위논문서고/ | 청구기호 0510 6YD36 382 | 등록번호 123064851 | 도서상태 대출가능 | 반납예정일 | 예약 | 서비스 |
컨텐츠정보
초록
The resources of the frequency are limited, and the importance of the technology to flexibly use the frequency resources has been increasing. To use frequency resources efficiently, there is a need for tunable RF circuits that can change operating frequency or bandwidth. Therefore, recently, various types of tunable filters have been studied. A large portion of conventional tunable circuits use varactor diodes, MEMS(Microelectromechanical systems) switches, or tuning plungers. This dissertation focuses on solving various downsides (complexity, loss of varactor diodes, the stability of tuning, etc.) that exist in conventional tunable filters. A new approach for the bandwidth tuning that allows for using a smaller number of tunable coupling structures when compared to the traditional bandwidth tuning method is proposed. In addition, this dissertation shows a new method for designing filters having a tunable notches and tunable passband. This work also presents two new approaches for tuning waveguide filters. The tuningmethods use contactless dielectric plates and tuning plungers which do not necessitate electrical grounding. Hence. physical implementation can be significantly simplified. It is believed that the design methods and structures for reconfigurable waveguide filters presented in thesis make waveguide filters more practical in comparison with conventional ones.
목차
Abstract Contents i List of Figures iv List of Tables xii 1 Introduction 1 2 Pseudo-Butterworth Filter 3 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Theory and Filter Design . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 Conventional Method . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.2 Proposed Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Filter Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.4 Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.5 Application to a Higher-Order Filter . . . . . . . . . . . . . . . . . . . . . 29 i2.6 Measurement of the fourth order filter . . . . . . . . . . . . . . . . . . . . 34 2.7 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3 Reconfigurable Bandpass Filter with Resonators in Cul-De-Sacs 39 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.2 Filter Topology with Two Cul-de-sac Resonators . . . . . . . . . . . . . . 42 3.2.1 Notch in each side of the stopband . . . . . . . . . . . . . . . . . . 44 3.2.2 Notches in one side of the stopband . . . . . . . . . . . . . . . . . 48 3.3 Design and Measurement of Filter with Two Cul-de-Sac Resonators . . . 50 3.3.1 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 3.3.2 Fabrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 3.3.3 Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3.4 Filter with Four Cul-De-Sac Resonators . . . . . . . . . . . . . . . . . . . 63 3.4.1 Filter Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 3.4.2 Filter Design, Fabrication, and Measurement . . . . . . . . . . . . 68 3.5 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4 K-band High-Q Frequency-Tunable Circular Cavity Filter 77 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 4.2 Resonator Concept and Design . . . . . . . . . . . . . . . . . . . . . . . . 81 4.3 Coupling Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 4.4 Measurement and analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 4.5 Fourth-Order Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 ii4.6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 5 Contactless Tuning Plunger and Its Application to K-Band FrequencyTunable Cavity Filter 103 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 5.2 Contactless Tuning Device . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 5.3 Filter Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 5.4 Measurement and Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 122 5.5 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 6 Conclusions 126 References 127 감사의 글