Non-Foster Matching of a Resistively Loaded Vee Dipole Antenna Using Operational Amplifiers

PROJECT TITLE :

Non-Foster Matching of a Resistively Loaded Vee Dipole Antenna Using Operational Amplifiers

ABSTRACT:

A non-Foster matching network using negative impedance converters (NICs) is proposed for a resistively loaded vee dipole antenna (RVD). The RVD suffers from considerable reflection at the feeding transmission line at low frequencies as a result of of its massive negative input reactance. To reduce the reflection, a non-Foster matching network, which is composed of NICs based on operational amplifiers (op-amps), is proposed. For the practical style, the consequences of input parasitic capacitances of the op-amp and the finite open-loop gain are considered. The stability analysis is performed per the Barkhausen stability criterion. The non-Foster matching network is implemented with the RVD as a load. The measured impedance demonstrates that the matching network significantly reduces the input reactance of the RVD. Within the time-domain analysis, the matched RVD is shown to mirror considerably less incident pulse. A target was imaged through a series of radar echo experiments. The images show that the non-Foster matching network enhances the performance of the RVD as an antenna for the ground-penetrating radar.

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