Wideband Radiation Reconfigurable Microstrip Patch Antenna Loaded With Two Inverted U-Slots
Wideband Radiation Reconfigurable Microstrip Patch Antenna Loaded With Two Inverted U-Slots
复制标题
DOI：
10.1109/tap.2018.2885433
复制
发表时间：
2019-03-01
影响因子：
5.7
通讯作者：
Pour, Maria
中科院分区：
文献类型：
--
作者：
Radavaram, Sai;Pour, Maria
本文提出了一种具有可重构辐射方向图的宽带矩形微带贴片天线，该天线包含两个对称倒U形槽，并沿贴片谐振长度包含两个同轴探头。通过控制通过这些探头施加的电流的相移，可以将天线设置为分别根据 TM01 和 TM02 模式激发 SUM 或 Difference 模式。与之前在 U 形槽微带天线上所做的努力不同，它实现了 68% 的宽阻抗带宽，以及稳定的极化和对称的辐射方向图。值得一提的是，基板的厚度非常小，约为0.02 lambda(d)的量级，其中lambda(d)是中心频率为3 GHz时介电介质中的波长。对缝隙和贴片参数进行数值分析，以实现宽带宽和对称辐射方向图。差分模式下实现的零点深度远低于 -30 dB，这使得所提出的天线非常适合单脉冲雷达应用。该天线覆盖的频率范围为 1.98-4 GHz。制造并测试了原型。观察到测量结果和模拟结果之间具有良好的一致性。
A wideband rectangular microstrip patch antenna with reconfigurable radiation patterns is proposed in this paper, which contains two symmetrically inverted U-slots, and incorporates two coaxial probes along the resonant length of the patch. By controlling the phase shift of applied currents through these probes, the antenna can be set to excite either the SUM or the Difference mode, in accord with the TM01 and TM02 modes, respectively. Unlike previous endeavors on U-slot microstrip antennas, a wide impedance bandwidth of 68% is realized, along with stable polarization and symmetrical radiation patterns. It is worth mentioning that the thickness of the substrate is very small, which is in the order of 0.02 lambda(d), where lambda(d) is the wavelength in the dielectric medium at the center frequency of 3 GHz. The slot and patch parameters are numerically analyzed to achieve wide bandwidth along with symmetric radiation patterns. The realized null depth in the Difference mode is well below -30 dB, which makes the proposed antenna well suited for monopulse radar applications. The antenna covers a frequency range of 1.98-4 GHz. A prototype is fabricated and tested. Good agreement between the measured and simulated results is observed.