This paper presents an investigation on the effect of the aspect ratio (AR or width-to-length ratio) of a conducting sheet for radiation control i.e., gain enhancement or suppression, leading to useful applications for wireless communication. A wideband slot antenna working in 6–8.5 GHz band is adopted as the basic antenna. It is found that for the sheet AR < 1, the boresight (θ = 0°) gain in the entire band is enhanced, while for AR > 1, boresight gain suppression is achieved. For an optimum AR such that AR_{(enhancement)} = 1/AR_{(suppression)}, the same sheet can serve the above dual purposes according to its azimuthal orientation with respect to the slot. For ϕ = 0° orientation with respect to the slot, the sheet acts as a gain enhancer, while for ϕ = 90° orientation, it suppresses the radiation, both in θ = 0°. Practically, the sheet orientation can be easily controlled manually. Antenna measurements demonstrate an impedance band of 6–8.66 GHz with bidirectional radiation pattern, and 1.11 dBi boresight gain at 7.25 GHz. A conducting sheet of size 1.45λ₀ × 0.29λ₀ where λ₀ is the free-space wavelength at 7.25 GHz, is loaded above the slot which improves the boresight gain by 5.77 dB, and when rotated by ϕ = 90°, suppresses the gain by 8.78 dB, both relative to the original slot antenna.

本文介绍了对用于辐射控制（即增益增强或抑制）的导电片的纵横比（AR 或宽长比）的影响的研究，从而为无线通信带来有用的应用。采用工作在 6-8.5 GHz 频段的宽带缝隙天线作为基本天线。研究发现，对于薄片AR < 1， 整个频段的视轴（ θ = 0°）增益得到了增强，而对于AR > 1，实现了视轴增益抑制。对于最优AR，使得AR _（增强）  = 1/AR _（抑制），根据其相对于槽的方位角方向，同一片材可以用于上述双重目的。对于φ = 相对于槽的 0° 方向，片材充当增益增强器，而对于 φ  = 90° 方向，它在θ  = 0° 时抑制辐射。实际上，纸张方向可以很容易地手动控制。天线测量表明阻抗频带为 6–8.66 GHz，具有双向辐射图，7.25 GHz 时的视轴增益为 1.11 dBi。_{尺寸为 1.45λ 0}  × 0.29λ ₀的导电片，其中 λ ₀是 7.25 GHz 的自由空间波长，加载在槽上方，可将视轴增益提高 5.77 dB，当旋转φ  = 90° 时，抑制增益 8.78 dB，均相对于原始缝隙天线。