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About 1,454 papers for “rectangular slit”

Rectangular Coax with Axial Slit and with Rectangular or Circular Center Conductor

D.M. Veličković, Žaklina J. Mančić, Dijana G. Zulkić · 1998

The analysis of rectangular coax with axial slit and with rectangular or circular center conductor is based on the equivalent electrodes method. The obtained values of characteristic impedance, resistance per unit line length and electric field distribution are presented and the influence of the slit is investigated.

Cited by 2

WIDE SLIT RECTANGULAR MICROSTRIP ANTENNA WITH SPIRAL EBG STRUCTURE

Savita M Shaka · International Journal of Research in Engineering and Technology · 2014

This paper introduces high impedance Electromagnetic Bang Gap (EBG) structure and investigates the performance of rectangular microstrip antenna embedded on a high impedance spiral EBG structure on ground plane. By loading EBG there is increase in bandwidth of the proposed antenna when compared with conventional RMSA. There is a suppression of surface waves which improves antennas radiation pattern and Back lobe level reduces.

Cited by 0Open access

Free vibration of a cantilever rectangular plate with slit.

Hideya YAMAGUCHI · TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C · 1986

In this paper, free vibration of the cantilever rectangular plate with slit is investigated by using an extended Rayleigh-Ritz method. To apply the method, the plate is considered as an assemblage of several rectangular plates. The plate displacement is presented for each element rectangular plate by interpolation functions corresponding to unknown displacements and slopes at the discrete points which are chosen along the edges, and series of functions which satisfy homogeneous artificial boundary condition. By inserting the boundary conditions in the equations which are given by minimizing the energy functional corresponding to the assumed displacement function, the frequency equation is obtained. In the numerical example, natural frequencies and mode shapes are presented for various aspect ratios of the plate and slit.

Cited by 0Open access

Stage-Discharge Relationship for Sharp-Crested Rectangular Slit Weirs

Ali R. Vatankhah · Journal of Irrigation and Drainage Engineering · 2019

Sharp-crested slit weirs are used for measuring small flow discharges. Different stage-discharge relationships can be found in the literature for computing the flow discharge of sharp-crested slit weirs. In this study, the performances of different available stage-discharge relationships are discussed using experimental data available in the literature. The flow process of a sharp-crested slit weir was analyzed based on the dimensional analysis theorem. The deduced stage-discharge equation was calibrated using the available experimental data for slit weirs with contraction ratios ranging from 0.017 to 0.25. The deduced stage-discharge relationship allowed measuring discharge values with an average error of 1.02% and a maximum error of 4.6%. The results of this study indicate that while weir Reynolds number is a predominant quantity affecting the flow discharge of rectangular slit weirs, the contraction ratio is a predominant quantity for contracted weirs. At the cost of less accuracy, an overall solution is presented in terms of the contraction ratio, which is applicable for slit, contracted, and suppressed weirs.

Cited by 21

Diffraction of light from a long rectangular phase slit

A. Mahmoudi · Journal of the Optical Society of America A · 2023

The phenomenon of light diffraction from an opaque screen containing a long rectangular slit has a closed-form solution in the Fraunhofer regime, which is covered in the undergraduate physics curriculum and experimentally verified. Here, we examine the more general situation of a semi-transparent plane that contains a long rectangular slit. Our analysis reveals that the diffraction patterns differ significantly between two specific cases: diffraction from an opaque screen containing a slit, and diffraction from a transparent plane featuring a slit (phase slit or a phase strip). The calculations demonstrate that the diffraction pattern resulting from the phase slit comprises two distinct sets of fringes with different spatial frequencies, and the width (size) of the phase slit (or strip) can be determined by examining the lower-frequency fringes. To verify these calculations, we fabricated appropriate phase slits and phase strips and analyzed their diffraction patterns. Our experimental findings showed excellent agreement with the theoretical predictions.

Cited by 1

Shielding Effectiveness of Metallic Enclosure with a Rectangular Slit Aperture

Soong-Keun Lee, Cheol‐Min Seong, Eunha Kim et al. · The Journal of Korean Institute of Electromagnetic Engineering and Science · 2012

직사각형 슬릿 개구를 갖는 금속 함체에 수직, 수평 편파를 입사하여 차폐 효과를 연구하였다. 직사각형 슬릿개구의 magnetic polarizability와 금속 함체의 공진 모드를 이론적으로 분석하였고, 이를 바탕으로 시뮬레이션 결과와 측정 결과를 비교 분석하였다. 또한, 함체 내부 프로브의 위치에 따른 차폐 효과 의존성도 분석하였다. Shielding effectiveness(SE) of metallic rectangular enclosure with rectangular slit apertures at horizontal polarization (HP) and vertical polarization(VP) is investigated. The magnetic polarizability of the rectangular slit apertures and the resonance modes of the metallic rectangular enclosure are analyzed theoretically. The simulation results based on these theoretical analyses are compared with the measured ones. The dependence of the shielding effectiveness on the location of the calculation probe inside the enclosure is also investigated.

Cited by 1

Implementation of rectangular slit-inserted ultra-wideband tapered slot antenna

Sun-Woong Kim, Dong‐You Choi · SpringerPlus · 2016

In this paper, a tapered slot antenna capable of ultra-wideband communication was designed. In the proposed antenna, rectangular slits were inserted to enhance the bandwidth and reduce the area of the antenna. The rectangular slit-inserted tapered slot antenna operated at a bandwidth of 8.45 GHz, and the bandwidth improved upon the basic tapered slot antenna by 4.72 GHz. The radiation pattern of the antenna was suitable for location recognition in a certain direction owing to an appropriate 3 dB beam width. The antenna gain was analyzed within the proposed bandwidth, and the highest gain characteristic at 7.55 dBi was exhibited at a 5-GHz band. The simulation and measurement results of the proposed tapered slot antenna were similar.

Cited by 15Open access

Clogging of a Rectangular Slit by a Spherical Soft Particle

Charles Paul Moore, Julien Husson, Arezki Boudaoud et al. · Physical Review Letters · 2023

The capture of a soft spherical particle in a rectangular slit leads to a nonmonotonic pressure-flow rate relation at low Reynolds number. Simulations reveal that the flow induced deformations of the trapped particle focus the streamlines and pressure drop to a small region. This increases the resistance to flow by several orders of magnitude as the driving pressure is increased. As a result, two regimes are observed in experiments and simulations: a flow-dominated regime for small particle deformations, where flow rate increases with pressure, and an elastic-dominated regime in which solid deformations block the flow.

Cited by 12Open access

MULTIOBJECTIVE OPTIMIZATION OF A SLIT RIB IN A RECTANGULAR COOLING CHANNEL

Han-Sol Jeong, Jaewon Seo, Kwang‐Yong Kim · Heat Transfer Research · 2018

A slit rib in a rectangular channel is optimized to simultaneously enhance heat transfer and reduce pressure drop using surrogate modeling and a three-dimensional Reynolds-averaged Navier–Stokes analysis. A multiobjective genetic algorithm is used for optimization. The shear stress transport turbulence model is selected as a turbulence closure model among three different turbulence models. Based on the results of a parametric study with the use of geometric parameters of the slit rib, three design variables (rear-to-front slit thickness, front slit thickness-to-rib height, and slit-to-rib height ratios) and two objective functions related to heat transfer and pressure drop in the rectangular channel are selected for optimization. Thirty- two design points are selected by Latin hypercube sampling. A surrogate model using response surface approximation is used to approximate the objective functions. The values of the objective functions at the selected design points are calculated to construct the surrogate models. A Pareto-optimal front that represents a compromise between the two objective functions is obtained using a multiobjective genetic algorithm. Through the optimization, the objective function values are improved by up to 7.9% and 7.2% for the area-averaged Nusselt number and friction factor, respectively, compared to a reference design.

Cited by 3

Divergence slit corrections for Bragg–Brentano diffractometers with rectangular sample surface

R. X. Fischer · Powder Diffraction · 1996

Algorithms are presented to correct intensities affected by divergence slit attenuation in the low 2θ region of Bragg–Brentano powder diffractometers with rectangular sample holders. The intensity loss below a limiting angle 2θ 1 occurs when the X-ray beam cross section exceeds the sample surface at decreasing angles. For identification purposes, the observed intensities can be scaled up to values comparable with intensities unaffected by divergence slit effects.

Cited by 17

Perturbation slit rectangular patch antenna in terahertz for thermal energy harvesting

Mohd Khairul Hisham Ismail · 2014

Research in terahertz (THz) technology is now receiving strong attention worldwide. Devices using this band are predicted to become important in a very wide range of applications. The number of research in this field has increased rapidly in applications such as information and telecommunications, ultrafast computing and energy harvesting technology. Even with such excellent potentials, investigation to explore the properties of devices structure in this band is still lacking. To excite the THz band field response, micro or nano structures are required. In this thesis, a patch structure with enhanced elements are designed and investigated for energy harvesting application at thermal radiation spectrum which lies from 20 THz to 40 THz. A conventional rectangular structure is initially designed to understand the behaviour of performances in THz region. Then a perturbation slit is introduced at the center of the rectangular structure to trap the THz field. Hence, the electrical field is guided into a single collection area named slit tunnel for energy conversion purposes. The relationship between the structure parameters and performances are then analysed and recorded. Through the proposed structure, a broader field bandwidth is achieved which can cover most of the thermal radiation spectrum. Importantly, the amplitude of the electrical field that concentrates on the perturbation slit is increased up to 110.6 V/m with receiving field of 1 V/m which can produce an enhancement factor of 110.6. A promising receiving beamwidth of approximately 850 is also achieved where the THz field can be collected from various directions. Next, the proposed structure is integrated with a Metal-Insulator-Metal (MIM) diode to form antenna-coupled diode. The structure integrates well with the MIM diode to produce approximately 0.495 A/m of magnetic field. The performances obtained are suitable for the proposed structure to be energy harvesting device which can collect the abundant thermal radiation and convert it into usable energy.

Cited by 0

Analysis of discharge rates in rectangular slit, ogee, and sharp-crested weirs

Hossein Sohrabzadeh Anzani, Ali Mahdian Khalili, Sameh Ahmed Kantoush et al. · Frontiers in Built Environment · 2026

Climate change has made flash floods increasingly common. It's crucial to have confidence in the structural integrity of dams during a flash flood. According to the International Commission on Large Dams (ICOLD), approximately one-third of dam failures are attributed to inadequate spillway capacity. The current study aims to compare the discharge of slit weirs with that of ogee spillways and sharp-crested weirs. Various experiments were conducted using rectangular slit weirs with different opening ratios ( b/B = 2/24, 3/24, 4/24, 5/24, 6/24, 7/24, 8/24, and 10/24). The results indicate that ogee spillways have an average discharge capacity of 13–68 times greater than that of the slit weirs, while sharp-crested weirs have a discharge capacity of 1.39–7.3 times that of the slit weirs. The ratio of ogee spillway discharge to the slit weir ( r ) and sharp-crested weir discharge to the slit weir ( r' ) increases with the rise of h/P . Moreover, the highest average values of r and r' are observed at b/B = 2/24, measuring 65.46 and 7.3, respectively. Conversely, the lowest values, 11.53 and 1.22, are associated with b/B = 10/24. Notably, the maximum values of r and r' , 71.2 and 7.61, respectively, also occur at b/B = 2/24.

Cited by 1Open access

Size Reduction of Rectangular Microstrip Patch Antenna using Slit Loaded Ground Plane

Dr. P. P. Sarkar · 2012

A microstrip patch antenna loaded with rectangular slit on the ground plane has been designed and studied. Microstrip antennas with slots on the radiating plane or on the ground plane have been investigated extensively by different researchers. Previously, in our paper, microstrip antenna loaded with ground plane slot was designed and a size reduction of 90 % was achieved. In place of slot, when slit is loaded on the ground plane their size reduction was enhanced to 97%. Our present paper deals with it.

Cited by 0