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 : Wan Nasarudin Wan Jalal (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Characterization of TixZn(1−x)Al2O4 Thin Films by Sol-gel Method for GPS Patch antennae
Huda Abdullah,Wan Nasarudin Wan Jalal,Mohd Syafiq Zulfakar,Mohammad Tariqul Islam,Badariah Bais,Sahbudin Shaari 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1
The need for miniaturization and weight reduction of a GPS patch antennae has forced scientiststo search for new microwave dielectric materials. The sol-gel method was used to prepareTixZn(1−x)Al2O4-based microwave dielectric ceramic thin films (x = 0.00, 0.10, 0.20 and 0.30) andto fabricate a GPS patch antennae. The phases of ZnAl2O4 and TiO2 co-exist with each otherand form a two-phase system, which is confirmed by the X-ray diffraction (XRD) patterns andthe Fourier-transform infrared (FTIR) spectra analysis. The addition of titanium dioxide (TiO2)increased the crystallite size, grain size, surface roughness and apparent density. A material witha higher density tends to increase the dielectric constant ("r), which is suitable for miniaturizationof a GPS patch antenna. As the TiO2 content increased, the "r values increased linearly. Finally,GPS patch antennae were successfully fabricated using the ZnAl2O4 and Ti0.30Zn0.70Al2O4 material. The performances and the operating frequencies of the GPS patch antennae were measuredusing a PNA series network analyzer. The result showed that both patch antennae resonated atfrequency of 1.570 GHz and gave a return loss less than −10 dB. The optimal performance of theGPS patch antennae was obtained from the specimen using Ti0.30Zn0.70Al2O4 ("r 14.57, widebandwidth of 240 MHz and low return loss of −34.5 dB), which meets the requirements of GPSapplications.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
