By James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis
So much antenna engineers are inclined to think that antennas are one know-how that's roughly impervious to the quickly advancing semiconductor undefined. even if, as proven during this lecture, there's a method to contain energetic elements into an antenna and remodel it right into a new form of radiating constitution which could make the most of the newest advances in analog circuit layout. The procedure for making this change is to use non-Foster circuit components within the matching community of the antenna. through doing so, we're now not restricted by means of the legislation of physics that practice to passive antennas. although, 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 state of the art during this topic, and (2) to introduce a few new theoretical and sensible instruments for assisting us to proceed the development of this know-how.
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Extra resources for Active Antennas with Non-Foster Matching Networks (Synthesis Lectures on Antennas)
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The third NIC circuit considered makes use of TI’s THS3202 CFA which possesses a 2 GHz unity gain bandwidth. Two amplifiers are contained within a single package. By combining the high speed of bipolar technology and all the benefits of complementary metal oxide semiconductor (CMOS) technology (low power, low noise, packing density), this amplifier is able to perform extremely well over a very large bandwidth. A SPICE model for the THS3202 can be downloaded from TI’s website and was implemented in Agilent ADS as shown in Fig.
The schematic of the FNR all-pass test circuit using these devices captured from Agilent ADS is shown in Fig. 47. The simulated performance of this FNR test circuit is shown in Fig. 48. As can be seen, the −20 dB return loss bandwidth approaches 200 MHz, and the circuit is unconditionally stable at all simulation frequencies. 6 GHz. Since we are simulating our circuits below 50 MHz, we are also relying on an accurate extrapolation of the S-parameters. 9 0 0 50 100 150 200 freq, MHz (b) FIGURE 48: Simulated (a) return loss and (b) stability of the all-pass test circuit for the NE85630 FNR neglected here, but do affect the circuit performance especially stability.
Active Antennas with Non-Foster Matching Networks (Synthesis Lectures on Antennas) by James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis