Estimation of Equivalent Circuit of Loaded Trans-receive Antenna System and its Time Domain Studies

Abstract

The time domain studies of different reduced-height loaded wire antennas (e.g., inverted L, T, I and C-shaped antennas) when used in trans-receive system is presented. Due to the reduced height of the loaded antennas, these antennas have found wide application as transmitting and receiving antenna/sensors for electromagnetic interference (EMI) measurements. However, while using these antennas in trans-receive system for wideband application, the time domain characterization of both the transmit and receive antenna is required and investigation on this has not yet been performed. This paper presents the results of the initial investigation on the time-domain performance of these loaded trans-receive systems. An optimized transmit antenna generator waveform is used to maximize receive antenna voltage amplitude (with bounded input energy), as presented in the recent literature. The frequency domain Method of Moments with Pulse basis function and Point-matching technique has been used to evaluate the current distribution on the antenna surface and hence the radiated electric field at the position of the receiving antenna. The same technique has been extended for receiving wire antenna to evaluate the Complex Antenna Factor (CAF) of these antennas. The CAF versus frequency data has been used to evaluate the input and output voltage waveform of the trans-receive system. The results have been verified with theoretical and experimental data available in reported works.