• Title/Summary/Keyword: patch

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Design and Analysis of Gap Coupled Microstrip Patch Antenna using the FDTD method (유한차분 시간영역법을 이용한 갭 결합 마이크로 스트립 패치안테나의 설계 및 해석)

  • Shin, Ho-Sub
    • Journal of Digital Contents Society
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    • v.10 no.3
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    • pp.389-393
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    • 2009
  • In this paper, the single patch microstrip antenna and gap coupled broadband microstrip patch antenna using FDTD(Finite Difference Time Domain method) are analyzed. Mur's 2nd absorbing boundary condition to minimize reflected wave is applied. Return loss, voltage standing wave ratio, and input impedance by the length and width of driving patch, the length and width of parasitic patch, and the distance between driving patch and parasitic patch have been analyzed. Design parameters and radiation patterns of broadband antenna have been also shown.

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The Design of Tx 30GHz/ Rx 20GHz Dual Feeding Circular Polarized Patch Antenna Using LTCC Process (LTCC 공정을 이용한 송신 30GHz/수신 20GHz 이중급전 원형편파 패치 안테나 설계)

  • 김성남;오민석;천영민;최재익;표철식;이종문;천창율
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.8
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    • pp.448-454
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    • 2004
  • In this paper, circular polarized antennas of Tx 30GHz and Rx 20GHz are implemented in LTCC process. Tx antenna has a circular patch structure and Rx antenna has a ring patch structure. The feeding line of Tx antenna is placed in the center hole of Rx ring patch antenna which is printed under Tx circular patch antenna layer. It makes antenna size smaller. Tx antenna's return loss in under -l0dB level from 30GHz to 31GHz and Rx antenna is under -10 dB from 20GHz to 21GHz. The isolation between two antennas is less than -20dB. Axial ratio is less than 3dB thoughout each band.

Radiation properties of Flush mounted Circular Patch Antenna (접지면과 높이가 같은 원형 패치 안테나의 복사 특성 해석)

  • Song, Jae-Young;Bang, Hyo-Je;Lee, Haeng-Seon
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.343-346
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    • 2005
  • Radiation properties of flush mounted circular patch antenna are investigated. The patch is fed axis-symmetrically by a coaxial cable. Rigorous analysis is given using integral transform and mode matching techniques. The presented method accommodates radiating patch, and integrated matching sections and band pass filter.

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Transmission Line Model for an Edge-Coupled Patch Antenna

  • Saksiri, Wiset;Chongcheawchamnan, Mitchai;Krairiksh, Monai
    • ETRI Journal
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    • v.30 no.5
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    • pp.723-728
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    • 2008
  • In this paper, a simple transmission line model for an edge-coupled patch antenna is presented. The coupled section is modeled with a lump network which represents the mutual admittance between patches and from patch to ground. Theoretical analysis of two edge-coupled patch antenna models are compared by simulation and experiment in antennas designed to operate at the 2 GHz band. The proposed model predicts the return loss of the antenna accurately.

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Design and Fabrication of Microstrip Patch Antenna for GPS (GPS용 마이크로스트립 패치 안테나 설계 및 제작)

  • 이은진;강부식;홍성욱;김홍수
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.183-186
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    • 2002
  • In this paper, a microstrip Patch antenna with the T-shaped slits, which are employed to reduce the patch size. is proposed for GPS In order to analyze characteristics of the antennas are defined green function of the moment method. The microstrip Patch antenna and microstrip Patch with the T-shaped slits are fabricated. The numerical result of return loss and -10d13 bandwidth are compared with measured results.

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Motion blur analysis by Gabor patch

  • Oka, Koichi;Oka, Daisuke
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.1039-1042
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    • 2007
  • Motion blur of LCD displays has been measured subjectively by using Gabor patch radiusese. Gabor radiuses at a normalized scroll speed, Scroll speed times Fc, to be unity, indicate motion blur strengths, which are named a perceived motion blur strength measured by a Gabor patch. The results are compared with eye perception, PBET and EBET.

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Soil Mineral Nutrients and Microbes Are Responsible for Large Patch Disease Caused by Rhizoctonia solani AG2-2 in Zoysiagrass Turf (골프장 한국잔디의 Rhizoctonia solani AG2-2에 의한 Large Patch 발생 토양에서 근권 미생물과 무기영양 평가)

  • Chang, Tae-Hyun;Ru, Yeon-Ju;Lee, Yong-Se
    • Asian Journal of Turfgrass Science
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    • v.21 no.2
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    • pp.113-126
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    • 2007
  • Mineral nutrients and population dynamics of soil microbes in the root zones of zoysiagrass infected by Rhizoctonia solani AG2-2 and that of healthy plants were sampled from ten golf courses using a cup cutter(diameter $10\;cm\;{\times}\;8\;cm$ deep). Analysis of variance(ANOVA) showed significant differences in content of $NO_3$-N(P = 0.05), $NH_4$-N(P = 0.1), and K(P = 0.1) between infected and healthy samples. The content of $NO_3$-N in the soils of large patch was 9.49 mg/kg and that in soil of healthγ plants was 7.02 mg/kg. However, the content of $NH_4$-N in the soil of large patch was 12.02 mg/kg whereas 14.40 mg/kg for the soil under the healthy plants. The content of K in the soil of large patch was lower than that of soil of healthy plants. There was few numbers of Pseudomonas colonies In the soils of large patch compared to that of healthy plants. These results indicated that the content of $NO_3$-N, NH4-N, and K and the microbial population dynamics in root zones correlated to occurrence of large patch.

Evaluation of Scopolamine Patch Pharmacotherapy for Motion Sickness in S. Korean

  • Lim, Sung-Cil;Lee, Myung-Koo;Lee, Chong-Kil;Lee, Bo-Reum
    • Biomolecules & Therapeutics
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    • v.16 no.2
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    • pp.161-167
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    • 2008
  • Scopolamine patch is an effective anticholinergic and antiemetic agent for motion sickness in S. Korea. Since this medication is Over The Counter (OTC) medication and may cause serious side effects when misused. Therefore, we evaluate the safety and efficacy for scopolamine patch in this study. We selected and surveyed total 43 patients who purchased scopolamine patch from three different pharmacies located at S and C Express Bus terminals and P Port at Seoul, Cheongju, and Busan. In the result, 11 patients (8${\sim}$15 year old:25.6%) were correctly used scopolamine patch with a children dose and 2 patients were misused. 26 (15${\sim}$60 year old: 60.4%) and 4 (over 6o year old: 9.3%) patients were correctly used with a adult dose. 33 patients (69.9%)answered that they knew the directions well how to use scopolamine patch correctly. Only 24.2% (n=8) patients learned the directions by pharmacist's consultation. Most patients (45 frequencies with duplicate counts) had some experienced side effects and among those drowsiness is the most common one. In conclusion, scopolamine patch as a non-prescription drug (OTC) should be monitored by pharmacist with correct drug consultation.

The Actuation and Measurement of plate Structures at a Specific Direction by a Magnetostrictive Transducer (자기변형 트랜스듀서를 이용한 평판구조물의 특정방향 가진 및 측정)

  • 이주승;조승현;선경호;김윤영
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.153-158
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    • 2004
  • The coupling phenomenon between stress and magnetic induction, known as magnetostriction, has been successfully applied to generate and measure elastic waves. Most applications of this phenomenon thus far, however, are rather limited to cylindrical ferromagnetic waveguides. The main objective of this work is to develop a new patch-type, orientation-adjustable magnetostrictive transducer that is applicable for non-cylindrical, non-ferromagnetic waveguides. The existing patch-type transducer consisting of a ferromagnetic patch and a racetrack coil is useful to generate elastic waves only in one specific direction once the patch is bonded to a test specimen. However, the proposed transducer can transmit and receive elastic waves in any direction only with one patch at a given location. The proposed magnetostrictive transducer consists of a circular nickel patch, a figure-of-eight coil, and a couple of bias permanent magnets. Because of the unique configuration of the transducer, the propagating direction of the generated waves can be freely controlled since the set of bias magnets and the coil is not bonded to the magnetostrictive patch. In this work, the characteristics of the proposed transducer were investigated experimentally.

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Design of "ㄷ"-Shaped Folded Microstrip Patch Antenna ("ㄷ" 자형 폴디드 마이크로스트립 패치 안테나 설계)

  • Heo, Hee-Moo;Seo, Jeong-Sik;Heo, Jin-Young;Woo, Jong-Myung
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.464-467
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    • 2003
  • In this paper, to reduce the patch size of microstrip antenna, folded surface-type patch antenna is designed and fabricated. Size reduction could be achieved because of the downed resonant frequency by the extended current path passing along below the transformated patch surface. Comparison of the patch size at the 1.575 GHz between plane type(length 82 mm${\times}$width 90 mm) and "ㄷ"-shaped folded type is carried and comparision of frequency variation at the same patch size is carried. The result is like that the patch size was reduced than the plane type by 60 mm(73.17 %) at the same frequency. Therefore, it could be checked that "ㄷ"-shaped folded type antenna is advantageous than the plane type in size reduction.

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