• Title, Summary, Keyword: Slot

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Circularly Polarized Electromagnetic Band Gap Patch-Slot Antenna with Circular Offset Slot

  • Hajlaoui, El Amjed
    • Journal of information and communication convergence engineering
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    • v.16 no.3
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    • pp.197-202
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    • 2018
  • This paper reveals the impact of the insertion of electromagnetic band gap (EBG) structures on the performance of circularly polarized (CP) patch-slot antenna with offset slot. Several optimizations are necessary to precise physical parameters in the aim to fix the resonance frequency at 3.2 GHz. The proposed antenna possesses lightweight, simplicity, low cost, and circular polarization ensured by two feeding sources to permit right-hand and left-hand circular polarization process (RHCP and LHCP). The measured results compared with simulation results of the proposed circularly polarized EBG antenna with offset slot show good band operations with –10 dB impedance bandwidths of 9.1% and 36.2% centered at 3.2 GHz, which cover weather radar, surface ship radar, and some communications satellites bands. Our investigation will confirm the simulation and experimental results of the EBG antenna involving new EBG structures.

A Quarter-Wavelength Open Circuited Microstripline Slot Array ($\lambda$g/4 개방 마이크로스트립 선로 스로트의 배열)

  • 배정이
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.19 no.6
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    • pp.80-83
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    • 1982
  • A quarter-wavelength open circuited microstripline slot array is realized at X-band froquency. The optimal feeding point is experimentally determined. The input impedance of the slot array for various frequencies and its radiation pattern are measured. The bandwidth of the slot array is increased by using the 4$\times$4 elements which are slightly different in length and feeding network which is suggested in this papers.

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Design and Fabrication of Microstrip Hybrid Slot Antenna Fed by CPW for Wireless LAN at 5.8GHz Band (5.8GHz 대역의 무선LAN용 CPW급전 마이크로스트립 하이브리드 슬롯 안테나 설계 및 제작)

  • 고수미;이권익;김홍수
    • Proceedings of the IEEK Conference
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    • pp.175-178
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    • 2002
  • In This paper, a microstrip slot antenna is designed and fabricated for wireless LAN at 5.8GHz band. The microstrip slot antenna is fed by CPW and formed the inductively slot and tile capacitively slot. To obtain wideband, the inductively slot is designed at 5.3GHz and the capacitively slot is designed at 5.8GHz. Resonant frequency of the fabricated microstrip slol antenna is 5.BCD, the bandwidth for VS%<1.5 is 29% and the gain is 4.6dB. The 3-dB beamwidth of E-plane and H-plane is 80 “ and 120 ”, respectively

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Performance Evaluation of the WDM Ring Network Based on Photonic Slot Routing (광-슬롯 경로 배정 방식을 기반으로 한 WDM 링의 성능 평가)

  • 한상현;이호숙;소원호;은지숙;김영천
    • Proceedings of the IEEK Conference
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    • pp.154-157
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    • 1999
  • Photonic Slot Routing(PSR) is a promising approach to solve the fundamental scalability problem of all-optical packet switched WDM networks. In photonic slot routing, packets destined for the same subnetwork are aggregated to form a photonic slot which is jointly routed as a single unit of information through the network. The relative location of the nodes from bridge may cause to fairness problem in the unidirectional WDM ring network based on PSR. As photonic slots from different subnetworks can originate contentions at the bridge, packets may be dropped and retransmitted. Thus we evaluated the performance of PSR based WDM ring network in the point of fairness for each node and slot contentions at the bridge. Simulation results show that the PSR based WDM ring requires a slot access mechanism to guarantee the transmission fairness and efficient switch architecture to resolve slot contention at the bridge.

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Performance of a time slot searching mechanism in multi-rate circuit switching system

  • Roh, Seung-Kye;Kook, Kwang-Ho;Lee, Jae-Sup;Chung, Min-Young;Sung, Dan-Keun
    • Korean Management Science Review
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    • v.10 no.1
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    • pp.127-137
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    • 1993
  • The blocking probabilities of nx64Kb/s multi-slot calls are generally much higher than that of single slot calls. In order to improve these blocking probabilities of multi-slot calls, we propose a scheme which searches the different numbers of time slots for different types of calls. We analyze the performance of our scheme in a double-buffered time-space-time switching network which accommodates multi-slot calls as well as single-slot calls. The proposed method yields the reduced blocking probabilities, the increased traffic handling capacity and teh reduced CPU processing load, compared with those of the conventional methods.

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Reduction Characteristics of Electromagnetic Penetration through Narrow Slots in Conducting Screen

  • Park Eun-Jung;Kim Ki-Chai
    • Journal of electromagnetic engineering and science
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    • v.6 no.2
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    • pp.130-134
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    • 2006
  • This paper presents the reduction characteristics of penetrated electromagnetic fields through a narrow slot in a planar conducting screen of infinite extent. When a plane wave is excited to the narrow slot, the aperture electric field is controlled by the parallel wire or parallel plate connected on the slot. The magnitude of penetrated electromagnetic fields through a narrow slot is controlled by electric field distributions on the slot. An integral equation for the aperture electric field on narrow slots is derived and solved by applying Galerkin's method of moments. The results show that the magnitude of the penetrated electromagnetic field can be effectively reduced by installing the parallel wire or parallel plate on the slot.

A 28-GHz Wideband 2×2 U-Slot Patch Array Antenna

  • Yoon, Nanae;Seo, Chulhun
    • Journal of electromagnetic engineering and science
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    • v.17 no.3
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    • pp.133-137
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    • 2017
  • In this study, a 28-GHz U-slot array antenna for a wideband communication system is proposed. The U-slot patch antenna structure consists of a patch, two U-shaped slot, and a ground plane. With the additional U-slot, the proposed antenna has around 10% of bandwidth at -10 dB. To increase gain, the U-slot antenna is arrayed to $2{\times}2$. The proposed antenna is designed and fabricated. The $2{\times}2$ array antenna volume is $41.3mm{\times}46mm{\times}0.508mm$. The proposed antenna was measured and compared with the simulation results to prove the reliability of the design. The bandwidth and gain of the measurement results are 3.35 GHz and 13 dBi, respectively and the operating frequency is around 28 GHz.

Design of Slot Wedge Shape for Reducing Cogging Torque in Outer Rotor Type Permanent Magnet Synchronous Generator with Open Slot Structure (개방형 슬롯 구조를 갖는 외전형 영구자석 동기발전기의 코깅 토크 저감을 위한 슬롯 ��지 형상 설계)

  • Kim, Bong-Ju;Park, Su-Kang;Moon, Jae-Won;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • pp.936-938
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    • 2011
  • This paper suggests the slot wedge shape for reducing the cogging torque of a gearless type direct-drive permanent magnet synchronous generator with open slot shape. To achieve this, we are designed the appropriate specifications of the permanent magnet synchronous generator by selected the appropriate material of slot wedge and various slot wedge shapes. The PMSG models were analyzed by finite element method. Finally, we have suggested appropriate material of slot wedges and its shape which has benefit to further reducing cogging torque and preventing decreasing of the generating power.

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End-Fire 방사특성을 가지는 2.4GHz ISM 밴드용 Open End 슬롯 안테나의 설계

  • Jo, Yun-Gi;Gwon, Gi-Hwan;Yun, Jeong-Ho;Im, Seong-Gyun;Lee, Yeong-Sun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.154-155
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    • 2010
  • 본 논문에서는 end-fire 방사패턴 특성을 가지는 2.4GHz ISM 밴드용 소형 open-end slot 안테나를 설계하였다. 안테나 설계 공간은 $23mm{\times}15mm$의 좁은 영역으로 한정된 공간 내에 안테나를 설계하기 위하여 한번의 Bent된 slot을 도입하였고, End-Fire 방사특성을 내기위해 안테나 수평면상의 위쪽 방향으로 slot을 open시킨 구조이다. Bent된 slot을 이용해 전체 slot의 길이를 변화시키지 않고 주파수의 조절이 가능하고, Feeding Line의 길이와 폭을 조절하여 보다 광대역의 특성을 얻을 수 있었다. 제작된 안테나의 공진 주파수는 2.46GHz이고 대역폭은 2.4GHz~2.61GHz 까지 약 210MHz(VSWR<2) 이다. 방사패턴은 동작 주파수 내에서 slot이 open된 방향으로 end-fire특성을 가지고, 안테나의 이득과 효율은 각 각 1dBi, 70% 이상의 성능을 가진다. 설계 결과의 검증을 위해 모의실험 결과와 측정 결과를 비교하여 제시하였다.

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Optimization of Slot Location for Stress Distribution in Rotating Disc of Diamond Tools (다이아몬드 공구의 회전원판내 응력 분산을 위한 슬롯 위치의 최적화)

  • Park Sungil;Lee Sangjin;Byun Seopong;Hwang Seoungtack
    • Korean Journal of Materials Research
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    • v.15 no.9
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    • pp.560-565
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    • 2005
  • The objective of this paper is to decide optimal of the slot angle to minimize stress concentration in rotating disc of diamond saw. The fracture phenomena of the slot are discussed by the theoretical and experimental approaches and then some recommendation are presented to prevent the fracture. The focus of this investigation is to evaluation the effect of the slot on stress distribution using optimum design technique and finite element method(FEM) analysis. Stress concentration of the slot with respect to the various parameter of the slot such position, size, number, rotation speed. From the experimental results, when the slot angle of diamond saw is located $8^{\circ}\~12^{\circ}$ from rotating direction, the maximum equivalent stress reduces.