Linear antenna arrays are synthesized to have maximum directivity for a specified beamwidth. The directivity is maximized subject to a given beamwidth such as null to null or half power one. The excitation currents are obtained using a matrix equation obtained from the Lagrange m...
This paper presents an antenna loaded with metamaterial to enhance its gain and directivity to improve the performance of a ground-penetrating radar system (GPR). We adjusted the parameters of the antenna to change its equivalent capacit... L Liu,C Zhang,L Yu,... - 《Journal of Microwaves ...
A fully analytical form, more general than any reported previously, for the optimum current distribution and maximum directivity of an arbitrary array consisting of dipoles parallel with each other, is derived. For an array configuration consisting of several hundred elements, a calculation takes a fr...
摘要: The discrete distributions which provide maximum difference directivity, analogous to that derived previously for continuous line sources, are considered, and some general results given.关键词: Antenna Arrays Directivity Wave Excitation Antenna Radiation Patterns Linear Arrays ...
In order to take the path loss into consideration, we have measured the average received power rrefray when a signal is sent with transmit power of P as 1 and with inter-node distance of dref , and use this value as a reference. Note that the impact of antenna directivity gains is ...
1. Three key parameters,namely beamwidth,directivity and maximum sidelobe level,are drawn versus the distance between field points and the center of aperture. 采用口径场绕射积分求取了天线的近场及远场方向图,绘制了波束宽度、方向性和最大副瓣电平三个关键参数随场点距离的关系曲线。
The radiation patterns of a wire antenna near an electrically large conductor is analyzed by using UTD theory. 采用一致性几何绕射理论分析了电大尺寸导体对其附近的对称振子天线辐射方向图的影响,计算了在三种不同环境下的天线方向图,结果与软件(FEKO)仿真结果吻合良好。 3. Then according to approach to ra...
Maximum Flow Rate in Open-Channel Flow for a Circular Pipe Introduction This application determines the greatest attainable water flow rate in a partially filled circular pipe. It uses the Manning formula to determine the flow rate in the open-channel...
Linear and planar antenna arrays are synthesized to have maximum directivity for a specified sidelobe level. The directivity is maximized subject to a given SLL. The beamwidth and the zeros of array factor are studied as well as the directivity. Maximum directivity-arrays are com...
For a half-wave thin asymmetrically fed V antenna,the angle subtended by the arms have been optimized against the ratio of arm lengths in order to ensure maximum directivity. Subsequently,an empirical relation is also proposed to relate this optimum value of antenna internal angle to the antenna...