A Reconfigurable Beamsteering Antenna Array at 28 GHz Using a Corporate-Fed 3-Bit Phase Shifter
A Reconfigurable Beamsteering Antenna Array at 28 GHz Using a Corporate-Fed 3-Bit Phase Shifter
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DOI：
10.1109/ojap.2023.3237882
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发表时间：
2023-01-01
影响因子：
4
通讯作者：
Alwan, Elias A.
中科院分区：
文献类型：
--
作者：
Uddin, Md Nazim;Tarek, Md Nurul Anwar;Alwan, Elias A.
设计并实现了一种基于微带线的3比特波束可调毫米波天线阵列。该天线由8单元紧密堆叠的孔径和可切换的馈电网络组成。后者由一个一至八路均匀微带共馈功率分配器组成，并通过接地层与辐射元件分开。为了实现耦合馈电，接地平面在每个天线元件下具有两排槽。在微带线上实现了一种开关机制，实现了3位周期相移的波束控制。通过以λ/8的间隔距离对8个馈电点进行采样，构造了相位为0度、-45度、-90度、-135度、-180度、-225度、-270度和-315度的3位移相器。在数值计算和仿真中，通过切换8种不同的采样状态，实现了从-50 °到+50 °的连续波束转向。通过在28 GHz下制造和测试三种不同的原型配置来验证该设计。实测样机与仿真结果吻合良好。值得注意的是，发现最大测量增益为13.44 dBi，在转向范围（即100度）内的增益阈值为10 dBi。
A 3-bit beam steerable antenna array based on a microstrip line is designed and implemented at 28 GHz for millimetre-wave application. The antenna consists of an 8-element tightly stacked aperture and a switchable feeding network. The latter consists of a one-to-eight-way uniform microstrip corporate fed power divider and is separated from the radiating element by a ground plane. To achieve coupled feeding, the ground plane has two rows of slots under each antenna element. A switching mechanism was implemented on the microstrip line to realize 3-bit periodic phase shifting for beamsteering. By sampling 8 feed points with a separation distance of lambda/8, a 3-bit phase shifter was constructed with phases of 0 degrees, -45 degrees, -90 degrees, -135 degrees, -180 degrees, -225 degrees, -270 degrees, and -315 degrees. Continuous beamsteering was achieved from -50 degrees to +50 degrees by switching eight different sampling states, both in numerical calculation and in simulation. The design was verified by fabricating and testing three different prototype configurations at 28 GHz. The measured prototypes showed an excellent match with the simulation results. Notably, the maximum measured gain was found to be 13.44 dBi with a gain threshold of 10 dBi within the steering range (viz. 100 degrees).