http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 문승온 (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
문승온,김은경,류한철,이홍열,강광용,곽민환,이수재,김원정,김용태,박강호 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
To study the geometrical-factor-dependent microwave performance of a coplanar waveguide (CPW) phase shifter based on a (001)-oriented (Ba,Sr)TiO3 (BST) film, we fabricated CPW devices having various gaps and widths. The microwave dielectric properties of BST CPW phase shifter devices were examined by calculating the scattering parameter obtained using a HP 8510C vector network analyzer with a frequency range of 0.5 . 20 GHz at room temperature under dc bias fields of 0 . 40 V. The measured reflection loss and insertion loss at 10 GHz with no dc bias were about .18 .4 dB and .15 .2 dB, respectively, and mainly depended on the impedances of the CPW transmission lines. The measured differential phase shift values were about 30 120 at 10 GHz with a 40-V dc bias variation and depended on the gap size.
-
An Active Module Using a Ferroelectric CPW Phase Shifter for a Ku-Band APAA System
류한철,강광용,곽민환,박성욱,문승온,이수재,김용태 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
This paper presents the development of an active module using a ferroelectric coplanar waveguide (CPW) phase shifter for a Ku-band active phased array antenna (APAA). This active module performs roles such as amplifying an RF signal with low noise coming from an antenna and changing the phase of a received RF signal. This module is composed of a 3-stage low-noise amplifier (LNA), a high-voltage dc block with an RF choke (RFC), and a ferroelectric phase shifter, whose structure is a CPW transmission line based on a (Ba, Sr)TiO3 (BST) thin film. The ferroelectric BST thin film is deposited on an MgO substrate by using pulsed laser deposition. Both ends of the CPW are continuously tapered to obtain good impedance matching without degrading the phase tuning property of the ferroelectric CPW phase shifter. The active module using a ferroelectric CPW phase shifter attains a phase-controllable range of 360 while retaining a return loss of better than .15 dB at Ku-band. The measured gain of the active module increases from 2 dB to 16 dB corresponding to a change in the dc voltage from 0 to 150 V with a 3.6 dB maximum noise figure at 12 GHz.d
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
