• Title/Summary/Keyword: 안테나 급전 구조

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Stacked Microstrip Antenna Design for PCS Base Station (개인휴대통신 기지국용 적층된 마이크로스트립 안테나 설계)

  • Park, Jong-Sung;Jeon, Joo-Seong;Kim, Hyung-Bum;Kim, Dong-Won;Jin, Sung-Woo;Lee, Jin;Lee, Yun-Hyun
    • Journal of Advanced Navigation Technology
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    • v.4 no.1
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    • pp.23-35
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    • 2000
  • In this paper, the design for a PCS base station antenna which is using broadband method by a stacked structure has been studied. The sensitive parameters, such as the parasitic elements, the height of air layer between the upper and lower patch, and the variation of feed point, of the microstrip antenna that has stacked structure in a characteristics variation situation are classified and the characteristics has been investigated through the simulations. A designed antenna has following characters. Impedance bandwidth is Z57.5MHz(VSWR${\leq}$2), horizontal beamwidth is $64.1^{\circ}$, and gain is 14.7dBi. Therefore, it is confirmed the characteristics is good. In this paper, through the designing of a stacked microstrip antenna, we has investigated the availability for Korea PCS base station antenna.

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Design of a Modified Half Wavelength Loaded Line Antenna Controllable Resonant Frequency and Input Impedance (공진 주파수와 입력 임피던스를 조절할 수 있는 변형된 반파장 로디드 라인 안테나 설계)

  • Jung Woo-Jae;Jung Byungwoon;Kang Gi-Cho;Park Myun-Joo;Lee Byungje
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.10 s.101
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    • pp.973-981
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    • 2005
  • A modified half wavelength loaded line antenna is designed and implemented for mobile terminal applications. The antenna is constructed with a radiating element of half wavelength loaded line structure, dielectric substrate, feeding post and two shorting posts on the experimental PCB. The shorting posts are located at each side of the radiating element and lumped inductance elements are on between each shorting post and ground of PCB. By controlling value of inductors, one can adjust resonant frequency and input impedance respectively. Within inductance value of 12 nH, the antenna can have wide operating range of $1,470\~2,660\;MHz$ and good impedance matching. The measured peak gains are between -0.45 dBi and 2.03 dBi for the operating band.

Design and Fabrication of the H-Type Slot Antenna with Bazooka Balun for a WiBro Repeater (WiBro 중계기용 Bazooka 발룬이 내장된 H형 슬롯 안테나의 설계 및 제작)

  • Choi, Won-Jun;Kim, Che-Young
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.5
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    • pp.515-522
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    • 2008
  • In this paper, a slot antenna with built-in Bazooka balun aimed for a WiBro repeater was designed and fabricated. The return loss and radiation pattern of the slot antenna were improved due to the introduced Bazooka balun. This balun brings about even radiation pattern and keeps the stabilized coverage of repeater And it is easy to unite this balun with the antenna body by providing the terminal of Bazooka balun with screw shape. H-type slot was used to reduce the size of the antenna, and the slot antenna was fabricated in the structural symmetry with respect to a feeding point to afford the omni-directional radiation pattern. The simulated results were obtained by MWS(Microwave Studio Simulator) of CST company, and the measurement on the proposed antenna was conducted in an anechoic chamber equipped with a network analyzer and a far field measurement system. The measured peak gain shows 5.75 dBi and the average gain is above -0.8 dBi. The return loss remains below -12.35 dB for all frequency bands in WiBro regarded as a good performance.

Design of a Broadband Quasi-Yagi Antenna for UHF Band (UHF 대역 광대역 준-야기 안테나 설계)

  • Yang, Myung-Gyu;Lee, Yun-Joo;Kwon, Jun-Hyoek;Lee, Chang-Kyun;Lee, Jong-Ig;Yeo, Junho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.939-940
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    • 2015
  • In this paper, a design method for a quasi-Yagi antenna (QYA) suitable for UHF band is studied. Due to the mutual coupling between a coplanar strip (CPS)-fed planar dipole and a conducting strip director placed close to the dipole, the dipole obtains broadband characteristics. A ground reflector improves gain in the lower frequency band, and the antenna size might be reduced by employing a bent reflector. The balun between the CPS line and the microstrip(MS) line is constructed by connecting the end of MS line and the CPS line through a shorting pin. In addition, a ring-type conductor connects the CPS line and reflector. The effects of various geometrical parameters and balun on the antenna characteristics are examined. An antenna, as an design example for the proposed antenna, is designed for the operation in the frequency band of 470-806 MHz for terrestrial DTV.

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(Design of RFID Reader Antenna Using Two Orthogonally Oriented 1x2 Sub-Arrays at 433 MHz) (직교형으로 배열된 2개의 1x2서브-어레이를 이용한 433MHz에서 동작하는 RFID 리더용 안테나 설계)

  • Kim Jong-Sung;Park Seung-Mo;Choi Won-Kyu;Seong Nak-Seon
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.9 s.339
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    • pp.97-100
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    • 2005
  • An orthogonal antenna is presented for reader application of radio frequency identification (RFID) at 433 MHz. Two 1x2 sub-arrays are orthogonally placed on a ground plane and two different feeding networks are applied to control horizontal and vertical radiation current flows for each sub-array, respectively. Inverted-F structures are used as radiation elements and can generate two linear polarizations by relative current distribution of radiators forming sub-arrays. Antenna gains are 2.7 and 0.4 dBi and isolation between two input ports is less than 25dB.

Design of a U-Type Planar UWB Antenna Composed of Monopole Pair (모노폴 쌍으로 구성된 U자형 평면 UWB 안테나 설계)

  • Lee, Ho-Sang;Jang, Jae-Sam;Jung, Young-Ho;Kim, Cheol-Bok;Kim, Jae-Hoon;Park, Seung-Bae;Lee, Mun-Soo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.9
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    • pp.60-66
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    • 2008
  • In this paper, the CPW-fed Ultra-wideband antenna is designed and fabricated for UWB communications. To achieve ultra-wide bandwidth of the antenna, we propose the mutual coupling of two planar monopole antennas. The mutual coupling of monopole pair of the proposed antenna is optimized by adjusting the parameters, the widths of the planar monopoles and the space between two monopoles. Two UWB antennas with different horizontal sections of the CPW-fed monopole antenna are fabricated and measured to examine the mutual coupling effects on the monopole pair antenna. The measured result show that two antennas are satisfied with UWB communication band(3.1$\sim$10.6Ghz).

Design of a Dual-Band Loop-Type Ground Antenna Using Lumped-Elements (집중 소자를 사용한 이중 대역 루프형 그라운드 안테나 설계)

  • Lee, Hyung-Jin;Liu, Yang;Lee, Jae-Seok;Kim, Hyung-Hoon;Kim, Hyeong-Dong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.5
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    • pp.551-558
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    • 2012
  • This paper presents a dual band loop-type ground antenna using lumped-elements that control the impedance bandwidth and resonant frequency. The dual-band operation of the proposed antenna is realized by inserting an additional resonated loop feed structure into the reference ground antenna. As the proper value of the capacitor and the inductor are chosen, the impedance bandwidth of our antenna with voltage standing wave ratio(VSWR) equal to 3 is 85 MHz and 725 MHz at the 2.45 and 5.5 GHz frequency band, respectively. Its validity is demonstrated via both the computed and measured results. Good antenna patterns and efficiencies are achieved at the dual frequency bands, as well as the physically small antenna element size($10{\times}5mm^2$).

Numerically Efficient Analysis of a Coaxial-fed Microstrip Patch Antenna (동축선으로 급전되는 마이크로스트립 패치 안테나의 효율적인 수치해석)

  • 이강렬;이영순
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.1
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    • pp.124-135
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    • 2000
  • In this study, a numerically efficient method for the analysis of microstrip structures is considered in conjunction with the use of closed-form spatial Green's functions. As is well-known, the use of the closed-form Green's functions can reduce the evaluation time of impedance matrix elements. However the problematic aspect that in general the evaluation results of diagonal elements of the matrix converge slowly, has been observed. The main cause of the slow convergence has been due to the terms of closed-form Green's functions with small exponent. In other to resolve the problematic aspect, a method of numerical integration based on the change of variable is considered in evaluating matrix elements. The present method is applied for the analysis of a coaxial-fed microstrip antenna. When the present results are compared with the previous results in order to check the validity of the present method, fairly good agreements between them are observed.

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Analysis of Perfectly Conducting Body of Revolution (BOR 구조 완전도체의 해석)

  • 이직열;정구철
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.2
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    • pp.225-230
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    • 1994
  • EFIE`s(Electric Field Integral Equations) are widely used in formulation of electric field problems and these equations are analyzed by several numerical method. In formulation of EFIF by forcing the tangential component of electric field on the perfect conducting body be zero, we can obtain equation with a kernel that has a logarithmic singularities. In this paper, an integral equation is presented which can be used for perfect BOR(Body of Revolution) objects and this can be more simplified for straight wire problem. As examples, monopole antenna which is driven by coaxial cable and scattering problems are considered.

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Analysis of Rectangular Microstrip Patch Antennas with the Multilayered Structure and the Electromagnetically Coupled Feed Structure (다층구조와 전자장결합 급전구조를 갖는 사각형 마이크로스트립 패치안테나의 해석)

  • 정문희;남상욱
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.2
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    • pp.18-25
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    • 1994
  • In this papaer, the input impedance of the rectangular microstrip patch antennas with the multilayered structure is analysed by using the moment method technique in the spectral domain. The analysis is carried out for two different feeding structures : directfeeding structure and electromagnetic-feeding structure. In order to obtain the accurate input impedance, the current distribution on the microstrip feed line is modeled by the quasi-TEM travelling wave and the PWS(piecewise sinusoidal) mode. The input impedances of the designed microstrip antennas are measured and compared with the calculation. which shows a good agreement.

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