상세정보
학술지
Multifunctional microstrip transmission lines integrated with defected ground structure for RF front-end application
- 저자
- Younkyu Chung, Seong-Sik Jeon, 김신호, Dal Ahn, 최재익, Tatsuo Itoh
- 발행일
- 200405
- 출처
- IEEE Transactions on Microwave Theory and Techniques, v.52 no.5, pp.1425-1432
- ISSN
- 0018-9480
- 출판사
- IEEE
- 협약과제
- 02MR4200, 전파적응형 안테나 부품 기술 개발, 표철식
- 초록
- This paper presents multifunctional microstrip transmission lines for designing a high port-isolation dual-frequency orthogonally polarized rectangular patch antenna and the antenna-integrated power amplifier. The proposed lines were realized through the integration of defected ground structures (DGSs) with conventional microstrip lines. A spiral-shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 2.0-GHz excitation to the antenna and filtering out the 2.5-GHz receiving signal from the other port. High-order harmonic signal suppression of the power amplifier at the 2.5-GHz port was accomplished by the dumbbell-shaped DGS, thereby improving the efficiency of the amplifier. Measurements show an improvement of 20 dB in port isolation and 3% in power-added efficiency relative to an identical RF front-end, but integrated with a conventional patch antenna. An image impedance of the DGS-integrated microstrip lines can be controlled by the integrated DGS geometries. Relatively high-impedances lines, i.e., 150 and 100 廓, are effectively implemented using microstrip lines with 75- and 50-廓 line widths by incorporating the spiral- and dumbbell-shaped DGSs, respectively.
- KSP 제안 키워드
- Dumbbell-shaped, Harmonic signal, High-order harmonics, Integrated Power Amplifier, Microstrip Line, Power added efficiency(PAE), RF front end, Transmission line, defected ground structure(DGS), dual-frequency, front-end application