• Title/Summary/Keyword: Microstrip Antenna

Search Result 415, Processing Time 0.349 seconds

A circular microstrip antenna with a parasitic element (비여진 소자를 추가한 원형 마이크로스트립 안테나)

  • 구인모;이상설
    • Journal of the Korean Institute of Telematics and Electronics D
    • /
    • v.34D no.1
    • /
    • pp.1-7
    • /
    • 1997
  • In this paper, several parasitic elements are added to the circular microstrip antenna in order to increase its bandwidth. Three kinds of parasitic elements such as cone, circular plate, and ring types are applied and input VSWRs, radiation patterns, and input impedances are measured. The optimal sizes of each parasitic element are obtianed and the variations of the bandwidth according to the height from the patch are also measured. In thid case of the ring type, the optimum bandwidth is obtained at the height of 10mm from the patch to the parasitic element. In the cases of conical and circular plate types, the maximum bandwidth is obtained at the hight of 45mm form the patch to the parasitic elements.

  • PDF

The Effect of a High Temperature Superconducting Patch on a Rectangular Microstrip Antenna

  • Chebbara, Fouad;Amir, Mounir;Fortaki, Tarek
    • Journal of Electrical Engineering and Technology
    • /
    • v.4 no.2
    • /
    • pp.277-281
    • /
    • 2009
  • The complex resonant frequency problem of a superconductor patch is formulated in terms of an integral equation which is the kernel of a dyadic Green's function. To include the effect of the superconductivity of the microstrip patch, the surface complex impedance of the superconductor film is introduced using the two fluids model of Gorter and Casimir. The Galerkin procedure is used in the resolution of the electric field integral equation. Numerical results concerning the effect of the operating temperature of a superconductor patch on the characteristics of the antenna are presented.

Design of CP Antenna with a Fenced Ground for a Handheld RFID Reader

  • Hong, Seok-Jin;Yu, Yeon-Sik;Lee, Dong-Hyun;Kahng, Sung-Tek;Choi, Jae-Hoon
    • Journal of electromagnetic engineering and science
    • /
    • v.7 no.2
    • /
    • pp.96-101
    • /
    • 2007
  • A design of circular polarized(CP) microstrip antenna with a fenced ground is proposed and the equivalent circuit is derived. The antenna consists of a square radiating patch with a pair of truncated comers, a bottom ground and a fenced ground. From conducted experiments, a patch size reduction using the metal fence as large as 25% from the conventional patch structure, has been obtained. The input admittance of the extracted equivalent circuit is shown to agree with that of the measurement. And the design parameters and performance of the proposed antenna are examined by analyzing the fields and circuit behaviors.

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
    • /
    • v.5 no.3
    • /
    • 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.

Electromagnetic Coupling Mechanism in the Aperture-Coupled and Feedline Gap-Coupled Microstrip Patch Antenna (Aperture와 Feedline Gap 결합으로 급전되는 마이크로스트립 패치 안테나의 전자기 결합 메커니즘)

  • Kim, Jong-Kyu;Yoon, Lee-Geun;Cho, Young-Ki
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.38 no.1
    • /
    • pp.27-33
    • /
    • 2001
  • This article describes an observation that the aperture coupling mechanisms in the aperture coupled microstrip antenna can be divided into two categories, cavity and parasitic types, depending on the separation between the microstrip patch and the ground plane. The similar phenomenon was observed in the relatively simple gap coupled microstrip antenna. The specific characteristics between two coupling mechanisms is discussed.

  • PDF

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

  • Kim, Ji-Hyuk;Kim, Hyeon-Cheol;Chun, Kuk-Jin
    • Proceedings of the IEEK Conference
    • /
    • /
    • 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

Trapezoidal Monopole Microstrip Antenna for UWB (UWB용 사다리꼴 모노폴 마이크로스트립 안테나)

  • Joo, Chang-Bok
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.46 no.2
    • /
    • pp.134-140
    • /
    • 2009
  • In this paper, we discussed the trapezoidal antenna model in the microstrip structure for UWB communications in the frequency band of $3.1{\times}10.6GHz$. Through the computer simulations for the difference size of trapezoidal monopole microstrip antenna model, the good impedance matching characteristic of return loss less than -10dB(VSWR<2) in all the band of UWB showed. The optimized antenna of this paper also showed the quasi-isotropic radiation characteristics in the horizontal plane and linear phase characteristic of nondispersive property.

Design of Composite Multilayer Surface Antenna Structure and Its Bending Fatigue Characteristics

  • Moon, Tae-Chul;Hwang, Woon-Bong
    • Advanced Composite Materials
    • /
    • v.17 no.3
    • /
    • pp.215-224
    • /
    • 2008
  • The present study aims to design a multilayer microstrip antenna with composite sandwich construction and investigate fatigue behavior of this multilayer SAS (surface antenna structure) that was asymmetric sandwich structure for the next generation of structural surface technology. This term, SAS, indicates that the structural surface becomes an antenna. Constituent materials were selected considering electrical properties, dielectric constant and tangent loss as well as mechanical properties. For the antenna performance, antenna elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.2 GHz. From electrical measurements, it was shown that antenna performances were in good agreement with design requirements. In cyclic 4-point bending, flexure behavior was investigated by static and fatigue test. Fatigue life curve of the SAS was obtained. The experimental results of bending fatigue were compared with single load level fatigue life prediction equations and in good agreement. The SAS concept is can be extended to give a useful guide for manufacturers of structural body panels as well as antenna designers.

Gain Analysis of the Radome Circular Microstrip Antenna using the Attachment Mode (어태치먼트 모드를 적용한 레이돔 원형 마이크로스트립 안테나 이득 해석)

  • 최동혁;박경빈;정영배;박성욱;문영찬;전순익
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.12 no.4
    • /
    • pp.532-541
    • /
    • 2001
  • In the case of the microstrip antenna with the coaxial probe-feeding, there is rapidly-varying patch current near the point where the probe feed is connected to the patch. We represent this current distribution using the attachment mode that insures continuity of currents from the feed to the patch. In this paper, we can accurately analyze the effect of a cover layer or radome for an antenna with the attachment which model rigorous probe feed.

  • PDF

Compact Size Wideband Microstrip Antenna Element for Repeater and Base Stations at 2 GHz

  • Choi, Young-Min;Lee, Bom-son
    • Journal of electromagnetic engineering and science
    • /
    • v.1 no.1
    • /
    • pp.43-47
    • /
    • 2001
  • A compact size microstrip antenna element using FR-4 substrate is proposed for use in repeater and base stations. Two stacked patches are aperture-coupled by two split feedlines. Rectangular stubs on the split feedlines are laid under the aperture and have the effect of considerably lowing the magnitude of $S_{11}$ [dB] and broadening impedance bandwidth. The designed structure has been fabricated and measured. Based on 20 dB, the return loss bandwidth is about 16.8% (1.86 GHz~2.20 GHz), which covers the frequency range assigned for IMT-2000 with a large margin. The overall dimension of the proposed antenna structure is 37 mm$\times$41 mm$\times$19mm (very compact). The antenna gain is more than 7.5 dBi over the required frequency range.

  • PDF