• Title/Summary/Keyword: 900MHz Antenna

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Triple-band Compact Chip Antenna Using Coupled Meander-line Structure for Mobile RFID/PCS/WiBro (결합 미엔더 선로를 이용한 모바일 RFID/PCS/WiBro 삼중 대역 소형 칩 안테나)

  • Lim Hyoung-Jun;Lee Hong-Min
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.2 s.105
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    • pp.178-183
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    • 2006
  • The proposed triple-band compact chip antenna using coupled meander line and stacked meander structure for mobile RFID/PCS/WiBro. The proposed antenna is designed to operate at 900, 1,800, and 2,350 MHz, and is realized by parasitic coupled and stacked a meander line. Meander lines are using extend length of effective current path more than monopole and contribute miniaturization. The coupled meander line controls the excitations of the mobile RFID and PCS, stacked meander line controls the excitation of the WiBro. The fabricated antenna size is $10.98{\times}22.3{\times}0.98\;mm$. The resonance frequencies are 905 MHz, 1.77 GHz and 2.32 GHz. The impedance bandwidths are 24 MHz, 140 MHz and 92 MHz. The maximum gains of antenna are 0.34 dBi, 2.58 dBi and 0.4 dBi at resonance frequencies.

The Design of the Broadband Sleeve Monopole Antenna using Loading Coil (로딩 코일을 이용한 광대역 슬리브 모노폴 안테나의 설계)

  • 최광제
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.3
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    • pp.250-256
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    • 2002
  • In this paper, a broadband sleeve monopole antenna using a loading coil in sleeve is proposed. The center frequency of the proposed antenna is 1,990MHz. The antenna of the proposed structure has the same of the single sleeve monopole antenna, except for using the coil instead of the inner conductor in sleeve. As a result, it is found that the bandwidth is 1.239~2.154 GHz(above 53.9 %) for $S_{11}=-10\;d B$(VSWR<2), and the antenna impedance is good for a communication system and feeder which the impedance has 50 Ω.

Design and Implementation of WWAN Antenna with Metal Structure for Increasing Frequency Bandwidth and Gain (안테나 대역폭과 이득 향상을 위한 금속 구조체가 적용된 WWAN 안테나의 설계 및 구현)

  • Lee, Keon-Myung;Cho, Il-Hoon;Cho, Young-Hee;Lee, In-Young;Kim, Young-Sik
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.9
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    • pp.940-946
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    • 2010
  • In this paper, we proposed the internal antenna on PCB(Planar Circuit Board) for achieving WWAN(Wireless Wide Area Network) operation in the laptop computer. The proposed antenna has a metal structure instead of printed pattern on PCB to improve the antenna characteristics for GSM850/900 bands. Compared to PCB embedded antenna without metal structure, the proposed antenna occupies similar area of $74{\times}11{\times}0.5\;mm^3$ with before and the bandwidth of the proposed one for GSM850/900 bands is increased 13 MHz than before. Further we confirmed that the proposed antenna has higher radiation gain of -4.45~-2.29 dBi for GSM850/900 bands than PCB embedded antenna without metal structure.

Design of the Linked Patch Monopole Antenna and Its SAR Analysis along with Antenna Direction (연결된 패치 형태의 모노폴 안테나 설계 및 안테나 탑재 방향에 따른 SAR 분석)

  • Yang, Joo-Hun;Lee, Seungwoo;Kim, Nam
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.10
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    • pp.1117-1127
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    • 2012
  • In this paper, the monopole antenna for satisfying GSM900/DCS1800/PCS1900/UMTS2100 services is designed. We can get the characteristic of the low frequency bands by connecting the front patch to the back patch of the antenna and get the low frequency resonance band using a front patch slit. The proposed antenna total volume is $40{\times}98{\times}1.6\;mm^3$, and it is designed on the FR-4 substrate having a relative dielectric constant of 4.4. As measurement result after fabrication, showed that the resonant frequency bandwidths are 156 MHz(828~984 MHz), 708 MHz(1.476~2.184 GHz) based on the return loss of 10 dB, and the radiation patterns show as the omnidirectional shapes for the E-field and H-field. For analyzing the human effects, the proposed antenna is mounted on the mobile-phone case. The averaged peak SAR over 1 g and 10 g is simulated and measured when the input power is 0.25 W. We have checked the variation of the SAR values when the antenna is mounted 4 different directions, then checked the direction having a relatively higher SAR. The results also satisfied the limiting SAR values which are 1.6 W/kg and 2.0 W/kg averaged over 1 g and 10 g tissues respectively.

Design and Fabrication of Dual Band Antenna using Skeleton Slot Radiator (Skeleton Slot 구조를 이용한 이중 대역 안테나의 설계 및 제작)

  • 김운필;이범선
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.1
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    • pp.40-46
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    • 2002
  • In this paper we design and fabricate the Skeleton slot antenna which operates dually in GSM 900 and 1800 bands. Its simulation results are also compared with the measured ones. The original Skeleton slot antennas had the problems of unsatisfactory VSWR characteristics and considerably changing horizontal radiation patterns at high frequencies, but the proposed design improves these problems using multi-path feeding network and folding structure. The size of the radiator is 154 $\times$ 106(mm), and its height is 33(mm), and the reflector of 190$\times$190(mm) is used. The material of the radiator and reflector is 1mm-thick aluminum. Using NTC process reduces the mass production cost significantly. The measured return losses are 13.7 % at 900 MHz band and 16.4 % at 1800 MHz band, respectively. The horizontal radiation beam width is stable within $\pm$ 1$^{\circ}$ at both frequency bands.

A Study on the RFID system in the Ubiquitous Home Network (유비쿼터스 홈 네트워크에서 RFID 시스템에 관한 연구)

  • Kim, Jun-Ju;Park, Sang-Uh;Lee, Ju-Hyun;Kim, Yong-Hwan;Ko, Duck-Young
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.1247-1252
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    • 2005
  • Recently, Ubiquitous Computing is being actively researched and one of the main technology in ubiquitous computing environment is recognized as RFID system. The RFID system is automatic recognition technique using radio frequency that attached a tag to product read information and able to record without physical contact. In this paper, classification of tag, an operation, structure and etc of the RFID system and described on the 900MHz region radio antenna radiation characteristics.

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Design of the Crab label tag with a loop matching feed and a modified dipole structure at 900 MHz

  • Choi, Eui-Sun;Lee, Hak-Yong;Lee, Jin-Seong;Lee, Kyoung-Hwan;Lee, Sa-Won;Lee, Young-Hie
    • Journal of Electrical Engineering and Technology
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    • v.6 no.4
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    • pp.551-555
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    • 2011
  • The Crab label tag with a loop matching feed and a modified dipole antenna structure was proposed. The antenna impedance is conjugated easily to a radio frequency identification IC chip impedance by a loop matching feed. The reading range of the crab structure tag is 0.9-1.0 m from the upper side of the formula milk can lid. The fabricated label tag size is $44.0{\times}44.0mm^2$. The operating frequency at -3 dB return loss is 861.0-929.0 MHz, and the maximum reading range at the anechoic chamber is 1.5 m.

Electromagnetic Interactions between Handset Antennas and Human Head: Anatomical Head vs. Multi-layered Spherical Head (휴대폰 안테나와 사용자 머리와의 전자기 상호작용: 해부학적 머리와 다층구형 머리 결과비교)

  • 김강욱
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.319-324
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    • 2001
  • An anatomical head and a multi-layered spherical head with a half-wave handset antenna have been analysed and compared using the Finite-Difference Time-Domain (FDTD) and the Eigenfuntion Expansion Method (EEM), respectively. The analysis shows that results from a simple spherical head with a half-wave antenna can be used to predict the main antenna radiation patters as well as estimates of the peak SAR in a handset user's head. Various representative design data are presented using a six-layered spherical head with a half-wave antenna at 900 MHz

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Design of a Planar Antenna for Wireless Communication Isolation Detector (무선 통신용 아이솔레이션 디텍터에 사용되는 평면형 안테나 설계)

  • Park, K.U.;Heo, Y.K.;Lee, J.K.;Mun, S.Y.;Cho, Y.K.
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.454-458
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    • 2003
  • It is well known that the antenna for wireless Tx/Rx isolation detector should have the broadband characteristics. Such antennas can be applied in all the frequency ranges such as Cellular, PCS, IMT-2000. In this paper, using the Finite-Difference Time-Domain(FDTD) method, one design example is given for the antenna operating in the frequency ranges of $800MHz{\sim}900 MHz$, $1.7GHz{\sim}2.2GHz$.

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A Study on Design of Dual-Polarized Microstrip Patch Antenna Using RFID (RFID용 이중편파 마이크로스트립 패치 안테나 설계에 관한 연구)

  • Park, Sang-Joo;Choi, Yong-Seok;Park, Byeong-Ho;Park, Chan-Hong;Seong, Hyeon-Kyeong
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2010.07a
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    • pp.229-232
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    • 2010
  • 본 논문에서는 900MHz대역의 대각선 슬롯형 마이크로스트립 패치 안테나를 설계하였다. 제안한 마이크로스트립 패치안테나는 안테나 크기, 절단 길이, 급전위치, 공기층의 높이 등과 같은 중요 파라미터를 고려하여 설계하였다. 설계한 마이크로스트립 패치안테나는 915MHz에서 최소의 반사손실을 가지며, 반사손실을 -16dB 이하에서 정재파비가 1.2이하일 경우, 약 26MHz의 대역폭을 확보함을 알 수 있다. 또한, 설계한 대각선 슬롯형 마이크로스트립 패치 안테나는 915MHz 중심주파수 대역에서 이득이 6dB이고, 축비가 2.8dB 되어 우수한 특성을 갖는다.

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