"A study on design method of planar antenna having ultra broad-band characteristics"

这里介绍的三极板型锥形槽天线（T-TSA）具有低交叉极化特性，因为T-TSA元件由屏蔽三极板线的中心导体馈电，以抑制有害辐射的影响。这种类型的T-TSA元件印刷在电介质衬底的两侧，其馈电系统由三极板线组成。天线的测试样品采用Teflon玻璃纤维衬底（epsilon _r=2.6, tan delta=0.0018, h=0.6mm）。T-TSA元件在x波段的e面和h面辐射图均显示出较高的性能。T-TSA的横向极化水平被抑制在- 30db以下。T-TSA元件的增益在8 ~ 12 GHz范围内均大于6.8 dBi，峰值电平为9.0 dBi。在阵列的设计中，估计T-TSA元件之间的相互耦合是很重要的。实验结果表明，当元件间距d为0.5lambda_o时，该阵列的h面互耦在-20 dB以下，e面互耦在-15 dB左右。由这些T-TSA元素组成的4*4元素数组。实验结果表明，该阵列具有良好的辐射方向图和增益特性。因此，T-TSA被认为是阵列天线中很有前途的元件。此外，还构建了由T-TSA元件组成的宽带双极化阵列天线，并在x波段进行了测试。在双极化阵列的两个端口都实现了良好的隔离特性。

A triplate-type tapered slot antenna (T-TSA) presented here has low cross-polarization characteristics, since the T-TSA element is fed by a center conductor of the shielded triplate line to suppress the influence of an unwanted radiation. This type of a T-TSA,element is printed on both sides of a dielectric substrate and its feeding system consists of a triplate line. Test samples of the antenna were made of Teflon fiberglass substrates (epsilon _r=2.6, tan delta=0.0018, h=0.6mm). The radiation patterns on both E-and H-plane of the T-TSA element at X-band revealed high performances. The cross-polarization level of the T-TSA was suppressed to below-30dB at the boresight direction.The gain of the T-TSA element was higher than 6.8 dBi from 8 GHz to 12 GHz, with a peak level at 9.0 dBi. In the design of an array, it is important to estimate the mutual coupling between the T-TSA elements. As a result of experiment, the H-plane mutual coupling of this type of array was below-20 dB and that of the E-plane was about-15 dB when the element spacing d was 0.5lambda_o. The 4*4 element array was composed of these T-TSA elements. The experimental results of this array demonstrated high performance in both radiation pattern and gain characteristic. Therefor, the T-TSA is considered to be a promising element in an array antenna. Moreover, a wide band dual-polarized array antenna composed of T-TSA elements was also constructed and tested at X-band. An excellent isolation characteristic was achieved at both ports of the dual-polarized array.