The invention belongs to the field of electromagnetic field and electromagnetic wave technology, and discloses a coaxial slotted antenna for realizing horizontal omnidirectional 45 degree oblique polarization radiation, which uses spiral grooves on the outer surface of the coaxial line to realize the horizontal omnidirectional oblique polarization radiation function by adjusting the size and position of the grooves, and adopts series feed and array spiral grooves to enter one. Step by step to improve the gain; slots on the outer core of the coaxial line are divided into three groups, each group has two layers, and four units in each layer are evenly and equally distributed around the coaxial line. The two slots of each unit are perpendicular to each other, and the unit is inclined 45 degrees relative to the axis. The coaxial feeding is used for the opening of the lower end of the coaxial line, and one port is used for the coaxial feeding directly. The feeding is simple and does not need the power distribution network. The invention can simultaneously satisfy the requirements of horizontal omnidirectional and 45 degree obliquely polarized radiation, and obtain higher gain than other omnidirectional antennas. At about 6.5dB, the cross polarization isolation degree is greater than 20dB, and the horizontal omnidirectional gain is not rounded within 1dB.
【技术实现步骤摘要】
一种实现水平全向45°斜极化辐射的同轴开槽天线
本专利技术属于电磁场与电磁波
,尤其涉及一种实现水平全向45°斜极化辐射的同轴开槽天线。
技术介绍
天线是发射和接收电磁波的设备,在通信系统中扮演着重要作用。天线按其方向性不同可分为全向天线和定向天线。定向天线是指在某一个或某几个特定方向上发射及接收电磁波特别强,而在其他的方向上发射及接收电磁波则为零或极小的一种天线。采用定向发射天线的目的是增加辐射功率的有效利用率,增加保密性。采用定向接收天线的主要目的是增加抗干扰能力。全向天线,即在水平方向图上表现为360°都均匀辐射,也就是平常所说的无方向性,在垂直方向图上表现为有一定宽度的波束,一般情况下波瓣宽度越小,增益越大。全向天线广泛应用于移动通信、射频识别等方面。±45°斜极化水平全向天线是一种既能接收/发射垂直极化波又能接收/发射水平极化波的全向天线。近年来,±45°斜极化受到的关注越来越多,因为在无线通信应用中,由于多径效应以及在复杂的电磁场环境中,目标信号的极化特性容易发生偏转,总是以不确定的极化方式出现,所以这种极化比常规的水平或垂直极化更有优势。±45°斜极化全向天线做接收天线时,对电磁波的极化基本没有要求,可以接收垂直极化波也可以接收水平极化波。从已发表的文献来看,虽然垂直/水平极化天线的应用较为普遍,但±45°极化更具优势,其理由是:±45°极化可以接收更多极化方向的电磁波,同等条件下有着更高的分集增益。分集增益是指在某一累积时间百分比内,分集接收与单一接收时的收信电平差。这一电平差越大,分集增益越高,说明分集改善效果越好。虽然它们的极化方 ...
【技术保护点】
1.一种实现水平全向45°斜极化辐射的同轴开槽天线,其特征在于,所述实现水平全向45°斜极化辐射的同轴开槽天线基于同轴圆柱体中的串馈螺旋矩形槽阵列;在同轴圆柱导体中围绕同轴柱体轴线对称布置;沿共轴圆柱轴线的24个基本辐射元件单元构成阵列。
【技术特征摘要】
1.一种实现水平全向45°斜极化辐射的同轴开槽天线,其特征在于,所述实现水平全向45°斜极化辐射的同轴开槽天线基于同轴圆柱体中的串馈螺旋矩形槽阵列;在同轴圆柱导体中围绕同轴柱体轴线对称布置;沿共轴圆柱轴线的24个基本辐射元件单元构成阵列。2.如权利要求1所述的实现水平全向45°斜极化辐射的同轴开槽天线,其特征在于,所述串馈螺旋矩形槽阵列的基本辐射单元是一对互相垂直的矩形槽,在同轴圆柱导体中围绕同轴柱体轴线对称布置,一周四对,等高。3.如权利要求2所述的实现水平全向45°斜极化辐射的同轴开槽天线,其特征在于,一对矩形槽中的一个槽倾斜轴向45度,而另一槽倾斜-45度。4.如权利要求1所述的实现水平全向45°...
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