Spurious Beam Suppression in Dual-Beam Phased Array Transmission by Impedance Tuning
Spurious Beam Suppression in Dual-Beam Phased Array Transmission by Impedance Tuning
复制标题
通过阻抗调谐抑制双波束相控阵传输中的杂散波束
DOI：
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发表时间：
2022
影响因子：
4.4
通讯作者：
R. Marks
中科院分区：
文献类型：
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作者：
Pedro Rodriguez;J. Sifri;Caleb Calabrese;Adam C. Goad;C. Baylis;R. Marks
双波束协同设计系统（如同时进行雷达和通信传输）面临的一个重大挑战是发射机功率放大器中的非线性引起的空间互调产生的杂散波束。我们证明，调谐的功率放大器的负载阻抗可以扭转elementwise功率放大器的非线性失真，减少不必要的波束传输的幅度和恢复的完整性的双波束天线方向图的应用程序的有源电子扫描阵列。最近记录的预失真方法校正杂散传输的比较，它示出，阻抗调谐可以解决两个元素的输出功率和线性度，而预失真只解决线性度问题，并导致放大器增益在许多阵列元件遭受。对于多个双波束角度的情况下，仿真结果表明，阻抗调谐是有效的，在两个波束方向上的波束功率最大化，最大化的元件功率放大器中的电流增益，并最小化不需要的寄生波束的大小。
A significant challenge for dual-beam, codesigned systems, such as for simultaneous radar and communications transmission, has been identified as the spurious beams produced by spatial intermodulation from nonlinearities in the transmitter power amplifier. We demonstrate that tuning the load impedance of the power amplifiers can reverse the elementwise power amplifier nonlinear distortion, reducing the magnitude of the unwanted beam transmissions and restoring the integrity of the dual-beam antenna pattern for application to an active electronically scanned array. A comparison to a recently documented predistortion approach for correcting spurious transmissions is provided, and it is shown that impedance tuning can address both element output power and linearity, whereas predistortion addresses only the linearity issue and causes the amplifier gain in many of the array elements to suffer. For multiple dual-beam angle scenarios, simulation results show that impedance tuning is effective at maximizing beam power in both beam directions, maximizing current gain in the element power amplifiers, and minimizing the size of the unwanted spurious beams.