Beyond the efficiency bandwidth limit with switched electrically small antennas

In this paper, transmission line analysis of the switched antenna is described. Evaluation of efficiency bandwidth performance is also presented in detail, based on different loss mechanisms in practical case. The presented antenna can generate wideband radiation with much higher efficiency. The transmission line is driven by a single tone source with a matching inductor through the switch, and the modulation pulses are directly added onto the switch. According to the high Q property of the short dipole, the inductor and the transmission line form a high Q resonator when the switch is turned on.near field of the dipole is represented by that associated with the transmission line.