Johnson J M, Reale D V, Cravey W H, Garcia R S, Barnett D H, Neuber A A, Dickens J C, Mankowski J J
Department of Electrical and Computer Engineering, Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, Texas 79409, USA.
Rev Sci Instrum. 2015 Aug;86(8):084702. doi: 10.1063/1.4927719.
Implementing nonlinear transmission line (NLTL) technology in the design of a high power microwave source has the benefits of producing a comparatively small and lightweight solid-state system where the emission frequency is easily tuned. Usually, smaller in physical size, single NLTLs may produce significantly less power than its vacuum based counterparts. However, combining individual NLTL outputs electrically or in free-space is an attractive solution to achieve greater output power. This paper discusses a method for aligning a four element NLTL antenna array with coaxial geometry using easily adjustable temporal delay lines. These delay lines, sometimes referred to as pulse shock lines or pulse sharpening lines, are placed serially in front of the main NLTL line. The propagation velocity in each delay line is set by the voltage amplitude of an incident pulse as well as the magnetic field bias. Each is adjustable although for the system described in this paper, the voltage is held constant while the bias is changed through applying an external DC magnetic field of varying magnitude. Three different ferrimagnetic materials are placed in the temporal delay line to evaluate which yields the greatest range of electrical delay with the least amount of variability from consecutive shots.
在高功率微波源设计中采用非线性传输线（NLTL）技术，具有能制造出相对小巧轻便的固态系统且发射频率易于调谐的优点。通常，单个NLTL在物理尺寸上较小，但其产生的功率可能比基于真空的同类产品少得多。然而，通过电方式或在自由空间中将各个NLTL输出进行组合，是实现更高输出功率的一种有吸引力的解决方案。本文讨论了一种使用易于调节的时间延迟线来对准具有同轴几何结构的四元件NLTL天线阵列的方法。这些延迟线，有时被称为脉冲冲击线或脉冲锐化线，串联放置在主NLTL线的前面。每条延迟线中的传播速度由入射脉冲的电压幅度以及磁场偏置设定。虽然对于本文所描述的系统，当通过施加不同大小的外部直流磁场来改变偏置时电压保持恒定，但每条延迟线都是可调节的。三种不同的亚铁磁性材料被放置在时间延迟线中，以评估哪种材料在连续发射中产生的电延迟范围最大且变化最小。
