By James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis
Such a lot antenna engineers are inclined to think that antennas are one know-how that's kind of impervious to the quickly advancing semiconductor undefined. despite the fact that, as validated during this lecture, there's a solution to contain energetic parts into an antenna and rework it right into a new form of radiating constitution which can make the most of the newest advances in analog circuit layout. The method for making this change is to use non-Foster circuit components within the matching community of the antenna. via doing so, we're now not limited through the legislation of physics that practice to passive antennas. in spite of the fact that, we needs to now layout and build very sensitive lively circuits. This new antenna know-how is now in its infancy. The contributions of this lecture are (1) to summarize the present cutting-edge during this topic, and (2) to introduce a few new theoretical and functional instruments for supporting us to proceed the development of this expertise.
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Additional info for Active Antennas with Non-Foster Matching Networks (Synthesis Lectures on Antennas)
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21. The schematic of the FNIC captured from Agilent ADS is shown in Fig. 39. As with all the NIC circuits, particular attention needs to be paid to stability. Each of the GNR circuits previously considered is a one-port device that can be stabilized by employing a series resistor Rin that also allowed evaluation of the overall reflection coefficient S11 in a 50 system. The return loss of the resulting one-port was used as a figure-of-merit for the bandwidth of the GNR. To assess the performance of a floating negative impedance circuit, we can construct a so-called all-pass two-port network using the circuit shown in Fig.
Active Antennas with Non-Foster Matching Networks (Synthesis Lectures on Antennas) by James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis