• 제목/요약/키워드: Microstrip Antennas

검색결과 275건 처리시간 0.035초

A Small Size Broadband MEMS Antenna for 5 GHz WLAN Applications

  • Kim, Ji-Hyuk;Kim, Hyeon-Cheol;Chun, Kuk-Jin
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • 제5권3호
    • /
    • pp.204-209
    • /
    • 2005
  • A small size broadband microstrip patch antenna with small ground plane has been fabricated using MEMS. Multiple layer substrates are used to realize small size and broadband characteristics. The microstrip patch is divided into 3 pieces and each patch is connected to each other using a metal microstrip line. The fabrication process is simple and only one mask is needed. Two types of microtrip antennas are fabricated. Type A is the micros trip antenna with metal lines and type B is the microstrip antenna without metal lines. The size of proposed microstip antenna is $8^{*}12^{*}2mm^{3}$ and the experimental results show that the antenna type A and type B have the bandwidth of 420 MHz at 5.3 GHz and 480 MHz at 5.66 GHz, respectively.

5GHz 무선랜 응용을 위한 소형 광대역 MEMS 안테나 (A Small Size Broadband MEMS Antenna for 5 GHz WLAN Applications)

  • 김지혁;김현철;전국진
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2006년도 하계종합학술대회
    • /
    • pp.603-604
    • /
    • 2006
  • A small size broadband microstrip patch antenna with small ground plane has been fabricated using MEMS. Multiple layer of high and low dielectric substrates are used to realize small size and broadband characteristics. The microstrip patch is divided into 4 pieces and each patch is connected to each other using a metal microstrip line. The fabrication process is very simple and only one mask is needed. Two types of microtrip antennas are fabricated. Type A is the microstrip antenna with metal lines and type B is the microstrip antenna without metal lines. The size of proposed microstip antenna is $8*12*2mm^3$ and the experimental results show that the antenna type A and type B have the bandwidth of 420MHz at 5.3 GHz and 480MHz at 5.66 GHz, respectively.

  • PDF

X-cut quartz를 이용한 마이크로스트립 안테나의 해석 (Analysis of resonant frequency in microstrip antennas using X-cut Quartz plates)

  • 강현일;황현석;이규일;이태용;승준태
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
    • /
    • pp.380-381
    • /
    • 2006
  • A technique to control the operating frequency of microstrip antenna by using the X-cut quartz substrate has been investigated experimentally and theoretically. We consider 6, 8 and 10 GHz resonance frequency in three dimensional quartz plates. Equation of linear piezoelectricity are solved for the thickness-shear approximation of X-cut quartz plates. At X-band frequencies, the microstrip antenna was voltage-controllable using the dc electric field dependence of the piezoelectric constant of X-cut quartz. This work demonstrates advantageous application for X-cut quartz plate in microstrip antenna substrates.

  • PDF

Optimum Return Loss of Right-Angle Triangular Slot Antenna

  • Tangkaphiphop, K.;Anantrasirichai, N.;Wakabayashi, T.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2004년도 ICCAS
    • /
    • pp.466-469
    • /
    • 2004
  • In this paper, we improve the matching impedance of antennas by inserting parasitic slots on the ground plane of right-angle triangular slot antennas. The designed antennas characteristics are analyzed by using Finite Different Time Domain (FDTD) method, the specific design frequency is 10 GHz and match impedance is 50 ohms. Simulation results show that the efficient of return loss and radiation patterns are improved and enhance. In this case, the right-angle triangular slot antennas with parasitic slots have matching impedance better than antennas without parasitic slots.

  • PDF

위성방송 수신용 배열안테나에 관한 연구 (A Study on the Array Antenna for Satellite Broadcasting Receiver)

  • 신용주;강기조;이학용;김종규;김종헌;이종철;김남영;박면주;이병제
    • 한국전자파학회논문지
    • /
    • 제14권8호
    • /
    • pp.787-795
    • /
    • 2003
  • 본 논문에서는 무궁화 3호 위성방송을 수신하기 위한 3종류의 배열 안테나가 제작되었다. 먼저 무궁화 3호 위성을 수신하기 위한 설계규격을 결정하였다. 두 번째로 위성 수신을 위한 다양한 종류의 안테나 중 radial waveguide의 특성을 이용한 안테나의 특성과 장점을 알아보았다. 세 번째로 3 종류의 안테나의 설계 방법을 연구하고, 각각의 특성을 고찰한 다음 설계규격을 만족하는 안테나를 제작, 측정하였다. 마지막으로 기존 parabola 안테나와 마이크로스트립 배열 안테나와 비교하여 제한된 크기에서 최대의 이득과 효율을 나타내는 안테나에 대해 결론을 내렸다.

An Orthogonally Polarized Negative Resonance CRLH Patch Antenna

  • Kahng, Sungtek;Jeon, Jinsu;Park, Taejoon
    • Journal of Electrical Engineering and Technology
    • /
    • 제10권1호
    • /
    • pp.331-337
    • /
    • 2015
  • A novel fully-printed microstrip antenna with negative first resonance and dual polarization is proposed. The radiator is printed on the 1-layer substrate instead of multilayers. The -1st resonance results from a composite right- and left-handed(CRLH) structure that has a circumferentially interlocked gap capacitively coupling a patch with a shorted-ring. This compact antenna is provided with a dual-polarization capability by creating two orthogonal linear polarizations in one body with coaxial feeds. The design is carried out by doing full-wave EM field simulation which is compared with the measurement of the fabricated antenna prototype. The measured results give the gain of 5 dBi and the efficiency of 78% at the -1st resonance mode as the center frequency of a downlink channel of the bandwidth over 20 MHz with 29 dB polarization isolation for mobile communication.

직사각형 도파관 속으로 전파하는 초고주파 전력 수신용 사각형 마이크로스트립 패치 안테나 설계 (Design of rectangular microstrip patch antenna for receiving a microwave power propagating in a rectangular waveguide)

  • 박동국
    • 한국정보통신학회논문지
    • /
    • 제1권2호
    • /
    • pp.131-136
    • /
    • 1997
  • 본 논문에서는 직사각형 도파관내에 놓여 있는 동축선으로 급전되는 사각형 마이크로스트립 패치 안테나의 입력 임피던스를 공진기 모델 및 안테나에 의해 여기되는 도파관내의 전송 모드로부터 이론적으로 계산하였다. 자유공간과 도파관내에서 패치 안테나의 급전 위치에 따른 return loss 및 효율을 계산하여 비교하였으며 최대 효율을 얻을 수 있는 급전점이 자유공간과 도파관에서 차이가 있음을 보였다.

  • PDF

Determination of Surface Currents on Circular Microstrip Antennas

  • Godaymi, Wa'il A.;Mohammed, Abdul-Kareem Abd Ali;Ahmed, Zeki A.
    • Journal of electromagnetic engineering and science
    • /
    • 제12권4호
    • /
    • pp.260-270
    • /
    • 2012
  • This work aims to present a theoretical analysis of the electric and magnetic surface current densities of a circular microstrip antenna (CMSA) as a body of revolution. The rigorous analysis of these problems begins with the application of the equivalence principle, which introduces an unknown electric current density on the conducting surface and both unknown equivalent electric and magnetic surface current densities on the dielectric surface. These current densities satisfy the integral equations (IEs) obtained by canceling the tangential components of the electric field on the conducting surface and enforcing the continuity of the tangential components of the fields across the dielectric surface. The formulation of the radiation problems is based on the combined field integral equation. This formulation is coupled with the method of moments (MoMs) as a numerical solution for this equation. The numerical results of the electric and magnetic surface current densities on the outside boundary of a CMSA excited by $TM_{11^-}$ and $TM_{21^-}$ modes are presented. The radiation pattern is calculated numerically in the two principle planes for a CMSA and gives a good results compared with measured results published by other research workers.

상호결합 특성이 고려된 기생소자를 갖는 구형 마이크로스트립 안테나 해석 (Analysis of the Rectangular Microstrip Antenna with Parasitic Elements Considering the Mutual Coupling Characteristics)

  • 손건호;윤리호;홍재표;조영기;손현
    • 전자공학회논문지A
    • /
    • 제28A권12호
    • /
    • pp.12-17
    • /
    • 1991
  • In this paper, E-plane gap-coupled rectangular microstrip antennas with parasitic elements are analyzed. The mutual coupling between the radiating edges is represented as the voltage-dependent current source. The gap coupling between the patch and parasitic element is characterized with the REC(Radiating Edges-Coupling) model, and the conventional transmission line model is used to obtain the equivalent circuit of the antenna. The return loss of the rectangular microstrip antennas with short-and open-circuit parasitic elements are calculated and compared with the measured values. The theoretical values including the mutual coupling are more in agreement with the measured values than the calculated values without the mutual coupling.

  • PDF

L자 형태의 급전구조를 갖는 광대역 마이크로스트립 패치 안테나 (Broad-Band Microstrip Patch Antenna with an L-Shaped Strip)

  • 김종규;이호준;오환술
    • 한국전자파학회논문지
    • /
    • 제12권5호
    • /
    • pp.827-836
    • /
    • 2001
  • L자 형태의 스트립 급전 구조는 두꺼운 유전체 기판 (두께=0.1λ)을 갖는 마이크로 스트립 안테나에 있어 적합한 구조이다. L자 형태의 스트립 급전 구조는 방사 패치와 결합하여 캐패시턴스 성분을 발생시켜 스트립 자체에 의해 발생되는 인덕턴스 성분을 억제시킨다. 본 논문에서는 PCS대역(1,750~1,870 MHz)과 IMT-2000대역(1,920~2,170MHz)의 광대역 주파수(420 MHz)를 모두 만족시킬 수 있는 L자 형태로 급전되는 안테나를 두 개 배열한 형태의 안테나도 소개한다. 이들 두 안테나는 모두 패스밴드에서 안정된 방사패턴을 가지며 임피던스 대역폭은 중심주파수 (1,960 MHz)의 31%(VSWR<1.5, 615 MHz) 이상을 가지고 약 7 dBi의 평균 이득을 갖는다.

  • PDF