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
- 주제어 : Handset Case (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Mulit Element를 이용한 PIFA 구조의 Intenna에 관한 연구
임요한,장기훈,윤영중,김용진,김영일,윤익재,Lim, Yo-Han,Chang, Ki-Hun,Yoon, Young-Joong,Kim, Yong-Jin,Kim, Young-Eil,Yoon, Ick-Jae 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.7
In this thesis, the Multi element antenna with wideband and enhanced gain characteristic is proposed to operate at both frequency range from 824 MHz to 896 11Hz for the CDMA and frequency range from 908.5 MHz to 914 MHz for the RFID band. The proposed antenna has tile size of $35{\times}15{\times}5mm^3$ in order to put it in the A model of S company and each element of the proposed antenna is folded to obtain the minimum size. To obtain the antenna with wideband and high gain characteristic, the radiator of the antenna is divided into 4 elements. As a result, bandwidth of the proposed antenna become broader and lower center frequency is appeared due to increased and lengthened current path. Moreover, the enhanced gain characteristic is verified because divided element structure that induct uniform current distribution can get increased antenna efficiency. To attain more uniform current distribution, modified structure of the feeding point that can deliver currents directly is designed. The antenna that alters the feeding structure has higher gain value. Each element is folded to increase the current paths considering the current directions to attain the miniaturization of the antenna. To measure the handset antenna, the handset case must be considered. Even though antenna is designed for predicted characteristic, the resonance frequency is shifted and antenna gain is deteriorated at predicted frequency while antenna is set in the handset case. 1.08 GHz of the resonant frequency is determined after frequency shift from 150 MHz to 200 MHz is confirmed and the maximum gain is measured as 3.1 dBi while antenna is not set in the handset. In case handset case is considered, the experimental results show that the impedance bandwidth for VSWR<2 is from 0.824 GHz to 0.936 GHz(110 MHz). This result appears that the proposed antenna can cover both CDMA and RFID band at once. The measured gain is from -3.4 dBi to -0.5 dBi and it has omni-directional pattern practically.
-
대역 저지 특성을 갖는 휴대 단말기용 초소형 UWB Intenna에 관한 연구
임요한(Yohan Lim),윤영중(Young Joong Yoon),호요철(Yo-Chuol Ho),정병운(Byungwoon Jung) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.12
본 논문에서는 대역 저지 특성을 갖는 휴대 단말기용 초소형 UWB 안테나를 제안하였다. 안테나를 소형화하면서 광대역 특성을 얻기 위해 안테나의 방사체와 밑면 및 옆면의 그라운드 간격을 조절하였다. 안테나의 PCB 뒷면으로 방사체를 연장하여 안테나 소형화를 구현하였으며, 안테나의 급전부를 tapered feeding structure로 변환하여 매칭 특성을 향상시켰다. 제안된 안테나의 주어진 공간은 14×14 ㎟로 설계되었으며, 안테나의 방사체 크기는 10×7 ㎟의 크기를 갖는다. 제안된 안테나는 VSWR<2 기준으로 저주파 UWB 대역인 3.15~4.75 ㎓와 고주파 UWB 대역인 7.2~10.2 ㎓를 모두 커버하고, 5.8 ㎓ 대역에서는 대역 저지 특성을 갖도록 하였다. 상용화된 케이스에 장착하여 측정된 반사 손실 역시 유사한 특성이 나타남을 확인하였다. 측정된 이득은 케이스를 고려하지 않는 경우, 최대 5.85 ㏈i의 높은 이득 값을 나타내었으며, 케이스를 고려하더라도 -2~-3 ㏈i의 최대 이득 값이 유지됨을 확인하였다. In this paper, small UWB antenna with band-stop function for mobile handsets is proposed. A gap between radiator and under and side ground is adjusted for small size and broa㏈and. A radiator is folded to the back side of PCB for miniaturization and tapered feeding structure is used to enhance matching characteristic. A antenna clearance has a size of 14×14 ㎟ and a size of radiator is 10×7 ㎟. It covers all UWB band from 3.15 ㎓ to 4.75 ㎓ and from 7.2 ㎓ to 10.2 GHz for VSWR<2 and has band stop characteristic at 5.8 ㎓. A maximum gain is measured as 5.85 ㎓. In case conventional handset case is considered, it also covers all UWB and a maximum gain is measured from -2 ㏈i to -2 ㏈i.
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
