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

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. although, as validated during this lecture, there's a option to contain lively parts into an antenna and rework it right into a new type of radiating constitution which may benefit from the most recent advances in analog circuit layout. The process for making this modification is to use non-Foster circuit parts within the matching community of the antenna. by way of doing so, we're now not restricted by way of the legislation of physics that practice to passive antennas. despite the fact that, 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 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 know-how.

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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. The schematic of the FNR all-pass test circuit using these devices captured from Agilent ADS is shown in Fig.

1951. [6] Yamaha, “Advanced YST,” Technology-Advanced YST [Online]. Available: http://www. htm [Accessed: Jan. 30, 2003]. [7] S. Dardillac, “Highly selective planar filter using negative resistances for loss compensation,” European Microwave Conference, 2003, pp. 821–824. [8] A. Antoniou, “Floating negative-impedance converters,” IEEE Trans. ), Vol. CT-19, No. 2, pp. 209–212, Mar. 1972. [9] S. E. Sussman-Fort, “Gyrator-based biquad filters and negative impedance converters for microwaves,” Int.

Cls January 19, 2007 17:23 ANTENNAS WITH NON-FOSTER MATCHING NETWORKS 27 The first NIC circuit that we consider is a grounded negative resistor (GNR) realized using the OPA690 op-amp from Texas Instruments (TI). The OPA690 is a wideband, voltagefeedback op-amp with a unity gain bandwidth of 500 MHz. Using the SPICE model for the device and the data sheet [11] provided by TI, an Agilent ADS model of the OPA690 can be created as shown in Fig. 26. In this circuit, port 1 is the noninverting input, port 2 is the inverting input, and port 3 is the single-ended output port.

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