• Title/Summary/Keyword: Microstrip Antenna

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A Study on Inset Fed Microstrip Antenna Loaded with Complementary Single Loop Resonator (CSLR을 갖는 인셋 급전 마이크로스트립 안테나에 관한 연구)

  • Hong, Jae-Pyo;Kim, Byung-Mun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.8
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    • pp.921-926
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    • 2014
  • In this paper, the characteristics of inset fed microstrip antenna loaded with CSLR(complementary single loop resonator) are studied. Effective permeability parameters of the SLR unit cell is retrieved from simulated scattering parameters, and structure parameters of the SLR unit cell are selected so that effective permeability is negative value at the operating frequency. The optimized inset fed microstrip antenna loaded with SLR for a $3{\times}3$ array in the ground plane of a conventional patch antenna is designed and simulation results of return loss and radiation pattern are shown. At resonant frequency 2.82 GHz, the overall dimension of the proposed antenna is reduced by approximately 56.8% compared to the conventional inset fed antenna. Simulation results are obtained by 3D FEM solver(Ansoft's HFSS).

High Tc Superconducting Microstrip Patch antenna ; Characterization of Superconducting Antenna using Non-Radiating Edge Feeding Technique (고온 초전도 마이크로스트립 패치 안테나; 비방사면 급전방식을 이용한 초전도 안테나 특성)

  • Chung, Dong-Chul;Park, Sung-Jin;Hwang, Jong-Sun;Park, Jong-Kwang;Han, Byoung-Sung
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.7
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    • pp.375-381
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    • 2000
  • In this paper, we described the characterization of High-Tc Superconducting(HTS) microstrip antenna using non-radiating edge feeding technique and reported the microwave properties of HTS antennas with temperature. To do this, we prepared the $YBa_2Cu_3O_{7-x}$ superconducting thin film on MgO substrate using pulse-laser deposition techniques. The HTS microstrip antenna using non-radiating feeding technique was fabricated using chemical wet-etching. Then it was compared with identical antenna patterned with evaporated gold. The diverse measured results have been reported in terms of the input impedance, resonant frequency and return loss. In additional, at around the critical temperature, the effect of kinetic inductance which affect the resonant characteristic of the HTS microstrip antenna was reported.

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Parammeter Optimization of the Electromagnetically Coupled Broadband Microstrip Antenna by Finite Difference Time Domain Method (시간영역 유한차분법을 이용한 전자기 결합 광대역 마이크로스트립 안테나의 파라메타 최적화)

  • 김정렬;윤현보
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.6 no.1
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    • pp.17-27
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    • 1995
  • In this paper, Finite Difference Time Domain (FDTD) method is used to analyze characteristics of the electromagnetically coupled broadband microstrip antenna, and to optimize the antenna parameters. By using short tuning stub in feedline, electromagnetically coupled microstrip antenna shows broadband (approximatcly equal 13%) characteristics, and the characteristics are varied as a function of length, width, and position of the tuning stub. Operating frequency, return loss, VSWR and input impedance are calculated by Fourier transforming the time domain results. Measurement data from fabricated electromagnetically coupled microstrip antenna are compared with FDTD results and are shown to be in good agreement. After optimization of the parameters, maximum bandwidth of about 15% is achieved.

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U-shaped Wideband Microstrip Antenna on Air Substrate (Air 기판을 이용한 U형 슬롯을 갖는 광대역 마이크로스트립 안테나)

  • Ceong, Hyi-Thaek;Kang, Young-Man;Rhee, Seung-Yeop
    • The Journal of the Korea institute of electronic communication sciences
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    • v.13 no.5
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    • pp.937-942
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    • 2018
  • This paper maximizes the research on broadband characteristics by using air layer instead of using microstrip structure of radiation part with U-shaped slot patched inside and microstrip antenna in order to make the microstrip antenna to have broadband characteristics. Experimental results show that the VSWR is 1.4 or less than the mobile communication frequency band(820~950MHz) and the gain of the antenna is 8.2dBd. This means that the antenna can be miniaturized, and it can be used in the wireless communication fields, and the mobile communication fields for other frequency bands in the future.

Design of a Small Loop Microstrip Antenna to load Capacitors (용량을 장하한 미소 루프 마이크로스트립 안테나 설계)

  • Park Seong-Il;Ko Young-Hyuk
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.637-640
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    • 2006
  • In this paper, a microstrip antenna with a small loop consisting of the left and right parallel plate to load capacitor is proposed. It is obtained the improved small size than the antenna of the transformed Uh and the antenna of the left and right parallel plate to load capacitor on QMSA. Equivalent circuit of transmission line model is designed to find more accurate resonant frequency. Also, the designed and fabricated antenna can receive both vertically and horizontally polarized waves to operating frequency of 1.5GHz. Therefore proposed antenna is available as a small antenna for wireless communication and will be quite useful for indoor communication

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Triangular Microstrip Antenna with T-type Slot (T형 Slot을 삽입한 삼각형 안테나)

  • Park, Byoung-Woo;Shin, Hye-Jung
    • The Journal of the Korea Contents Association
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    • v.7 no.7
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    • pp.24-30
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    • 2007
  • This paper observed characteristics of a triangular microstrip patch antenna with T-slot. When a narrow horizontal slot or vertical slot is embedded in a triangular microstrip antenna, we investigated variations of dual resonant frequency according to slot lengths and then we could make a triangular microstrip antenna with T-type slot suitable to a very low dielectric substrate. The proposed antennas used a dielectric substrate which has relative dielectric constant ${\epsilon}_r=3.38$ and a height of 8 [mils] (=0.2032mm) and antenna characteristics of horizontal or vertical slot antennas are compared by a ensemble 8.0 simulator. Theoretical and experimental results of manufactured antennas are compared.

A Study on the Antenna for Mobile Communication (이동체 통신용 안테나에 관한 연구)

  • 고영혁;김재민;이종악
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.7 no.2
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    • pp.139-146
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    • 1996
  • In this paper, the total electric field antenna in the small loop and aperture plane structure to load a capacitance on transformed QMSA(Quarter-wavelength Microstrip Antenna) from MSA(Microstrip Antenna) is proposed, and the total electric field is shown that the calculated value is agreed resonably with experimental value. Itis a smalled antenna of the radiation element and ground plane with equal width. The designed and manufactured antenna can receive borth vertically and horizontally polarised waves to operating frequency of 1.5GHz; therefore this is available as a smalled antenna for wireless telephones and will be quit useful for indoor communication. Also, antenna's equivalent circuit with transmission line model is designed to find more accurate resonant frequency and is calculated return loss value. The calculated value is agreed resonably with experimental value.

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A Superconducting $Y_1Ba_2Cu_3O_{7-\delta}$ Square Spiral Microstrip Antenna

  • Jung, Sung-H.;Song, Ki-Y.
    • Progress in Superconductivity
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    • v.2 no.1
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    • pp.51-55
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    • 2000
  • A $Y_1Ba_2Cu_3O_{7-\delta}$ square spiral microstrip antenna (YBCO antenna) was epitaxially grown on a $LaAlO_3$ substrate by laser ablation. Also fabricated was a gold square spiral microstrip antenna (gold antenna) having the same structure as that of the YBCO antenna in order to compare the properties of both antennas. Both the YBCO antenna and the gold antenna were operated in Ku (12-18 GHz) band, and their properties such as the return loss, SWR, power gain, and radiation patterns were investigated at 77 K. The return loss below -10 dB was obtained in two frequency ranges, i.e., 14.05-14.90 GHz, and 16-18 GHz for the YBCO antenna at 77 K (YBCO superconducting antenna), and in the frequency range of 15.05-17.60 GHz for the gold antenna at 77 K. The SWR bandwidths are 0.85 GHz and 2 GHz for the YBCO superconducting antenna, and 2.55 GHz for the gold antenna at 77 K. The gain improvement of the superconducting YBCO antenna over the gold antenna at 77 K was about 10 dB in the frequency range of 16 GHz to 18 GHz. The radiation patterns show the YBCO superconducting antenna has the omni-directional property of a spiral antenna.

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A Corner-Truncated Equilateral-Triangular Microstrip Antenna and Its Applications for Reconfigurable Antennas with Polarization Diversity (모서리가 잘린(Corner-cut) 구조를 가진 정삼각형 마이크로스트립 안테나와 편파 변환 재구성 안테나로의 응용)

  • Sung, Young-Je
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.10
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    • pp.1159-1165
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    • 2008
  • In this paper, a single-feed equilateral-triangular microstrip antenna with truncated corners is used for achieving diverse radiation polarization. The proposed antenna is excited by a microstrip line, which is place parallel to an oblique side of the equilateral-triangular patch. Depending on whether the three identically-sized comers of the triangular patch are cut or not, the equilateral-triangular microstrip antenna shows linear polarization(LP) or left-hand circular polarization(LHCP) or Tight-hand circular polarization(RHCP). Based on the equilateral-triangular microstrip antenna with truncated corners, a novel reconfigurable microstrip antenna with switchable polarization sense is also proposed. The proposed reconfigurable antenna has a simple structure, consisting of a corner-truncated triangular patch, a small triangular conductor, and a microstrip line. Using a biased PIN diode between the patch and the small triangular conductor, it can produce LP or RHCP according to bias voltages. From the measured results, low cross polarization level when operated in the linear state and good axial ratio in the circular state are observed.

Design of Microstrip Antenna for Satellite Navigation System Jamming

  • Shin, Jae Yoon;Park, Chong Hwan;Woo, Jong Myung
    • Journal of Positioning, Navigation, and Timing
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    • v.7 no.1
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    • pp.37-42
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    • 2018
  • This paper proposed a microstrip antenna that can perform jamming of satellite signals from the GPS L5, GLONASS G3, BDS B2 frequency bands (1164 - 1217 MHz) that are employed mainly for military purposes among the GNSS frequencies using unmanned aircrafts over the enemy's sky in time of emergency. The single element in the proposed antenna can be easily mounted to unmanned aircrafts. This study analyzed the characteristics of miniaturization and beam of radiating elements by applying the image theories and perturbation effect to satisfy the uniform level at ${\pm}45^{\circ}$ of beam steering goal due to the phase delay after antenna array. The designed microstrip antenna had a miniaturized radiating element area (x-y plane), which was reduced by 76.3% compared to that of basic microstrip antenna, and its beam width was $190^{\circ}$ in the E-plane and $140^{\circ}$ in the H plane. In addition, the simulation was conducted to determine the characteristics due to the phase delay by arranging the designed single microstrip antenna by $1{\times}4$ array and the results showed that beam steering of ${\pm}45^{\circ}$ is possible in the H-plane on the basis of $0^{\circ}$. Thus, the proposed antenna was verified to be effective in satellite signal jamming in the air as it was attached to the lower end of unmanned aircrafts.