Numerical study of a log-periodic antenna on an extended hemispherical lens

Abstract

This paper presents a numerical simulation of a logperiodic antenna on an extended hemispherical lens. The overall performance of the antenna in terms of input impedance, radiation patterns, and radiation efficiency was studied and analyzed with the aid of a full-wave electromagnetic simulator. A hybrid method combining geometrical optics inside the lens and physical optics outside the lens was not necessary for calculating the far-field pattern of the antenna using this approach. This direct approach reduced the number of simulation iterations and was capable of characterizing the antenna characteristics accurately.

Four-Arm Sinuous Antenna With Low Input Impedance for Wide Gain Bandwidth

“…antennas, on the other hand, has frequently been studied in spiral antennas. The most common method of reducing input impedance is to design on the printed circuit board (PCB) with a high dielectric constant [23], [24]. These design techniques are the most basic way to reduce the input impedance.…”

“…These design techniques are the most basic way to reduce the input impedance. However, using the PCB with a high dielectric constant generates the substrate mode, and the antenna gain decreases as it moves to the high operating frequency band [23], [24]. A structure that used lumped elements to reduce input impedance was studied similarly [25].…”