Array of spatial power combination for wide angle sector coverage

Le Chang, Zhijun Zhang, Yue Li, Zhenghe Feng
2014 Microwave and optical technology letters (Print)  
constructed our stimulus signals based on different inputs to calculate the output response based on the augmented input. We measured the voltage waveforms at the output of the first-order and the second-order Gaussian derivatives pulse generators. These differentiators reduce the rise time by almost 50%, that is, half-rise time pulse shaping, and a summation is used for passing only the positive parts while removing the negative ringing portion. These differentiators network, however, also
more » ... nuates the pulse amplitude as expected. The fall time and pulse width are further reduced using the differentiators and summing the various responses using Matlab as shown in Figure 3 . The rise time characteristics for the Gaussian pulse is 123 ps, for the Monocycle pulse is 92 ps, and for the Doublet pulse is 56 ps. It is found out that using one differentiator a drop of 31 ps, and using two differentiators the drop is larger and amounts to 67 ps, that is, significant rise time decrease can be achieved in the first peak of these signals [7, 8] . Figure 7 shows the measured impulse TDR observed at port 1 of the defected structures, with a 50 X termination on port 2. The excitation sources are M 0 (t), M 1 (t), and M 2 (t) as shown in Figure 3 . Also Figure 7 indicates a discrepancy between measured data and simulated results. This discrepancy is fabrication and assembly tolerances. The time characteristics for the measured TDR results shown in Figure 7 are summarized in Table 1 .
doi:10.1002/mop.28756 fatcat:lvzcpwixvnaizkzix3feniwsni