A Paper-based Lightweight Absorber with Ultra-wide Absorption Band
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This work presents a novel lightweight absorber with ultra-wide absorption band. The proposed absorber is designed on one kind of periodic rectangle cellular structure made of aramid paper, which is placed above one thin metal film. Each cellular cell contains one rectangle cavity filled with air, while taper shaped resistive patterns are printed on the walls of the cavity to produce energy losses. Under the normal incidence, the simulated results show that the bandwidth for the absorber with reflection less than -10 dB has a wide absorption band (reflection <; -10dB) from 4.87 GHz to 30GHz, and the thickness of the absorber is only 10mm.Keywords:
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Resistive touchscreen
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The rectangle strategy is the first level 3 strategy that is not an extension of easier ones. As I explained in Chapter 2, this strategy relies on sets of cells that form rectangular patterns. You implement it with the functions rectangle(), rectangle_pattern(), rectangle_cell(), and rectangle_step() (see Listings 12-1, 12-2, 12-3, and 12-4, respectively).
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Figure 1 V1 and V2. The numbered sections enclosed by the heavy lines show the cuts that are necessary to form the new rectangles and parallelogram from the original parallelogram. There are nine sections in all. The intersections of the perpendiculars dropped from the points (a 1 1, a 12) and (a2,1a22) produce a large and small rectangle. The small rectangle is taken from the left corner to minimize the number of cuts necessary in the original parallelogram. The numbered sections are shown in Figure 2 in their new arrangement. This demonstrates that the area of the original parallelogram of Figure 1 is equal to the area of the large rectangle minus the area of the small rectangle. Expressed algebraically, the area of the
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A simple design of a resistive ink-based microwave absorber for the S and C-band is presented here. The proposed double-layer absorber is printed on an FR-4 substrate using resistive ink. The proposed structure has more than 99 % of absorption from the frequency range 3.15 GHz to 8.4 GHz, which covers S-band and C-Band. The proposed structure is stable up to 30° for oblique incidence and polarization insensitive. The variation of paint conductivity and a variation of thickness of paint is also studied. A model of an equivalent circuit is also designed to understand the mechanism of the proposed absorber.
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The reader will be familiar with the golden rectangle, i.e. that rectangle which leaves another rectangle of the same shape when the largest possible square is cut from it (Fig. 1). In this article the effect of successively cutting squares from rectangles of other shapes will be investigated.
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Abstract Given a rectangle containing uniformly distributed random points, how far are the points from the rectangle’s centre? In this paper we provide closed-form expressions for the cumulative distribution function and probability density function that characterise the distance. An expression for the average distance to the centre of the rectangle is also provided.
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Closed-form expression
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Abstract The paper presents formulas describing an exact solution to the boundary value problem of the theory of elasticity in a rectangle in which the horizontal sides are rigidly clamped, and normal and tangential stresses are given on the vertical ones. Only an odd-symmetric deformation of the rectangle with respect to the horizontal axis of symmetry and an even-symmetric deformation of the rectangle with respect to the vertical axis of symmetry are considered. The paper is based on the previously obtained solutions for a free half-strip and a free rectangle.
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