By James T. Aberle, Robert Loepsinger-Romak, Constantine A. Balanis
So much antenna engineers tend to think that antennas are one know-how that's kind of impervious to the swiftly advancing semiconductor undefined. besides the fact that, as established during this lecture, there's a method to contain energetic parts into an antenna and remodel it right into a new form of radiating constitution that may reap the benefits of the most recent advances in analog circuit layout. The process for making this change is to use non-Foster circuit parts within the matching community of the antenna. through doing so, we're not limited by way of 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 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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Extra resources for Active Antennas with Non-Foster Matching Networks (Synthesis Lectures on Antennas)
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.
In Fig. 41, a schematic captured from Agilent ADS shows the THS3202 FNIC configured as a –50 FNR and placed into an all-pass system configuration with a load impedance RL = 50 across ports 3 and 4. Notice in the schematic the presence of the μ token which allows the assessment of the small-signal stability of the network. Simulated results for return loss and small-signal stability of the THS3202 FNR in the all-pass network are shown in Fig. 42. cls January 19, 2007 17:23 ANTENNAS WITH NON-FOSTER MATCHING NETWORKS 37 S-PARAMETERS S _P a ra m SP1 S ta rt=10 MHz S top=500 MHz S te p=1000 kHz Te rm Te rm1 Num=1 Z=50 Ohm VAR VAR1 R_L=50 Rin=50 Va r E qn MuP rime MuP rime MuP rime 1 MuP rime 1=mu_prime (S ) Floa ting_NIC_Antoniou_1a _THS _port X1 R R10 R=Rin Ohm Te rm Te rm2 Num=2 Z=50 Ohm R R5 R=R_L Ohm FIGURE 41: Schematic captured from Agilent ADS of the THS3202 FNIC of Fig.
Clearly, the condition given in (41) is satisfied almost exactly and the GNR functions properly at 500 kHz. Because of the excellent simulation results, a printed circuit board (PCB) implementation of the GNR test circuit shown in Fig. 28 was realized using readily available FR4 copper laminate and surface mount device (SMD) resistors and capacitors. Fig. 30 shows the assembled OPA690 GNR evaluation board. The simulated and measured return losses are compared in Fig. 31. In general there is excellent agreement between simulation and measurement.