By James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis
Such a lot antenna engineers tend to think that antennas are one know-how that's kind of impervious to the quickly advancing semiconductor undefined. besides the fact that, as tested during this lecture, there's a technique to comprise lively elements into an antenna and rework it right into a new form of radiating constitution that could benefit from the newest advances in analog circuit layout. The method for making this modification is to use non-Foster circuit parts within the matching community of the antenna. via doing so, we're not limited by means of the legislation of physics that practice to passive antennas. although, we needs to now layout and build very sensitive energetic circuits. This new antenna know-how is now in its infancy. The contributions of this lecture are (1) to summarize the present state of the art during this topic, and (2) to introduce a few new theoretical and sensible instruments for supporting us to proceed the development of this know-how.
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Extra info for Active Antennas with Non-Foster Matching Networks (Synthesis Lectures on Antennas)
To implement an FNIC, two THS3202 amplifiers (in the same package) can be used to realize the circuit shown in Fig. 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.
S. Patent Number 6,121,940, Sept. 19, 2000.  J. L. Merill, “Theory of the negative impedance converter,” Bell Syst. Tech. , Vol. 30, pp. 88–109, Jan. 1951.  Yamaha, “Advanced YST,” Technology-Advanced YST [Online]. Available: http://www. htm [Accessed: Jan. 30, 2003].  S. Dardillac, “Highly selective planar filter using negative resistances for loss compensation,” European Microwave Conference, 2003, pp. 821–824.  A. Antoniou, “Floating negative-impedance converters,” IEEE Trans. ), Vol.
Skahill, R. M. Rudich, and J. A. S. Patent Number 6,121,940, Sept. 19, 2000.  J. L. Merill, “Theory of the negative impedance converter,” Bell Syst. Tech. , Vol. 30, pp. 88–109, Jan. 1951.  Yamaha, “Advanced YST,” Technology-Advanced YST [Online]. Available: http://www. htm [Accessed: Jan. 30, 2003].  S. Dardillac, “Highly selective planar filter using negative resistances for loss compensation,” European Microwave Conference, 2003, pp. 821–824.  A. Antoniou, “Floating negative-impedance converters,” IEEE Trans.