Radiation enhancement of a broadband resistively loaded dipole with an overlapping ellipses profile for impulse application

Abstract

This paper presents a broadband resistively loaded modified dipole (RLMD) with an overlapping ellipses profile for radiation enhancement of impulse systems. Based on the equivalent circuit model, a simple method is introduced and analyzed to improve the impedance matching performance of a printed resistively loaded dipole (RLD) by replacing the metal strip with an elliptical profile metal strip. Following this method, a tapered resistively loaded dipole consisting of several resistors and equally separated metal strips with a profile of three overlapping ellipses is proposed. To further improve the impedance matching performance of the proposed antenna, the normalized Euclid distance (NED) is employed to vary the size and position of each ellipse. To verify the performance, the proposed antenna is fabricated and measured. The measured reflection coefficient of the antenna covers from 390 MHz to 10 GHz, which is consistent with the simulated results. In addition, the transmission performance of the proposed antenna is analyzed in the time domain by measuring it with two identical antennas. The received signal amplitude of RLMD is 5.74 dB higher than that of RLD, which is consistent with the simulated results. Therefore, the proposed antenna is appropriate for enhancing the radiation performance of impulse systems.