Download Active Antennas with Non-Foster Matching Networks (Synthesis by James T. Aberle, Robert Loepsinger-Romak, Constantine A. PDF

By James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis

So much antenna engineers are inclined to think that antennas are one expertise that's kind of impervious to the speedily advancing semiconductor undefined. in spite of the fact that, as confirmed during this lecture, there's a solution to comprise lively elements into an antenna and rework it right into a new type of radiating constitution which can reap the benefits of the newest advances in analog circuit layout. The strategy 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 via the legislation of physics that follow to passive antennas. besides the fact that, we needs to now layout and build very sensitive lively circuits. This new antenna expertise 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 assisting us to proceed the development of this expertise.

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46. The simulated –15 dB return loss bandwidth is expanded to greater than 250 MHz. Unfortunately, the circuit is not unconditionally stable for frequencies less than 125 MHz, but may be relatively easy to stabilize since μ is so close to unity. Another way to implement an FNIC is to use two BJTs to realize the circuit shown in Fig. 23. 8 0 50 100 150 freq, MHz (b) FIGURE 46: Simulated (a) return loss and (b) stability of the all-pass test circuit for the THS3202 FNR formed by two back-to-back GNRs with a 45 nH series inductor RF transistor from NEC.

However, the reactance of the THS3202 GNR is nonzero and behaves like a parasitic inductance. Thus, potentially we may be able to compensate for it and extend the bandwidth of the circuit. Having had some success in fabricating GNRs, we turned our attention to floating negative resistors (FNRs). This work is still in its early stages, and only simulation results are presented here. To implement an FNIC, two THS3202 amplifiers (in the same package) can be used to realize the circuit shown in Fig.

Pozar, Microwave Engineering. , 2005. [3] G. Skahill, R. M. Rudich, and J. Piero, “Electrically small, efficient, wide-band, low-noise antenna elements,” Antenna Applications Symposium, Allerton, 1998. [4] G. Skahill, R. M. Rudich, and J. A. S. Patent Number 6,121,940, Sept. 19, 2000. [5] J. L. Merill, “Theory of the negative impedance converter,” Bell Syst. Tech. , Vol. 30, pp. 88–109, Jan. 1951. [6] Yamaha, “Advanced YST,” Technology-Advanced YST [Online]. Available: http://www. htm [Accessed: Jan.

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