A simple printed antenna with broadband property and omnidirectional radiation patterns of wire dipole

This letter presents a unique printed dipole antenna which can roughly cover an 80% fractional bandwidth (VSWR ≤ 3), and especially possess the omnidirectional radiation patterns similar to those of wire dipole antenna at its all resonant modes. The antenna is simple with a microstripfed structure which it is just composed of two arms with each one forming the shape of a conventional "inset-fed" rectangular patch antenna. At the lowest operation frequency for VSWR = 3, the antenna size is only 0:3γ × 0:008γ, showing its effectiveness in many applications of small antennas. © 2020 Institute of Electronics Information Communication Engineers. All rights reserved.