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 swiftly advancing semiconductor undefined. although, as proven during this lecture, there's a solution to contain energetic parts into an antenna and rework it right into a new form of radiating constitution that could make the most of the most recent advances in analog circuit layout. The strategy for making this alteration is to use non-Foster circuit components within the matching community of the antenna. through doing so, we're not restricted via the legislation of physics that observe to passive antennas. even if, 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 sensible instruments for aiding 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)
Thus, the NE85630 FNIC is used in the next section for the floating non-Foster reactance used in the active matching network for our ESA monopole. In addition to the NIC circuits discussed in detail in this section, we also made considerable effort trying to realize NIC circuits that utilized CCII- blocks implemented as cascades of GaAs PHEMT devices. We simulated these circuits extensively and were able to obtain excellent performance in simulation with bandwidths greater than 1 GHz. Unfortunately, our attempts to physically implement these designs have all ended in failure.
As a quick proof-of-concept, the MAX435 GNR was breadboarded using a MAX435 in a 14-pin dual in-line package and surface mount discrete components. Wires with small diameters were used in some cases to create short circuits. 3 MHz S top=200 MHz S te p= Zin Zin1 Zin1=zin(S 11,P ortZ1) Te rm Te rm 1 Num =1 Z=50 Ohm R Rin R=Rin Ohm Va r Eqn VAR VAR1 Rs ca le =1000 Rs ca le 2=1000 Rin=100 ZL=50 R Rs ca le R=Rs ca le Ohm DC DC DC1 R Rs ca le 2 R=Rs ca le 2 Ohm R ZL R=ZL Ohm MAX_435_port_wo_TLs X1 FIGURE 33: Schematic captured from Agilent ADS of the circuit for evaluation of the MAX435 NIC used to create a good ground plane for the device as recommended in .
The computed return loss looking into the input of the matching network is shown in Fig. 50, and the total efficiency of the antenna together with the active matching network is shown in Fig. 51. Note that an extremely broadband and highly efficient match has been achieved. The geometrically derived stability factors as a function of frequency are shown in Fig. 52. These factors must be strictly greater than 1 for the circuit to be unconditionally stable. Note that below about 31 MHz, the overall circuit is not unconditionally stable.