Broadband Monopole Antenna With Wideband Circular Polarization

Abstract

A novel broadband monopole antenna design with wideband circular polarization (CP) characteristic is presented. This antenna consists of a feed line and a step-shaped ground plane which is formed by cutting a notch in the upper left corner of an asymmetric ground plane. The asymmetric ground plane is capable of exciting two orthogonal electric field vectors with equal amplitude and 90 • phase difference (PD) for CP. By cutting a notch, the 10-dB impedancebandwidth can be enhanced greatly and the 3-dB axial ratio (AR) bandwidth is also improved meanwhile. The measured impedancebandwidth is about 5.96 GHz (84.7%) from 4.06 to 10.02 GHz, and the measured AR-bandwidth is about 2.64 GHz (36.5%) from 5.91 to 8.55 GHz. The results show that the antenna can achieve wide impedance-bandwidth and wide AR-bandwidth simultaneously.

A broadband and wide beam circular polarization LTCC microstrip antenna analysis and design with characteristic modes theory

“…Such configuration involves slightly perturbing the antenna structure at appropriate locations with respect to the feed to excite orthogonal modes. Several types of perturbations have been reported to obtain CP antenna [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The 3 dB circular polarization bandwidth and the beam width of traditional microstrip antennas are usually very small with a single feed point.…”

A Perturbed Circular Monopole Antenna With Circular Polarization for Ultra Wideband Applications

“…The monopole antenna reported in [4], utilized a step shaped ground that improves both impedance bandwidth (~5.96 GHz) and axial ratio (AR) bandwidth (~2.64 GHz). In [5], an intricate UWB antenna with a CP band of 7.18-10.01 GHz was introduced.…”

A Multiband and Omnidirectional, CPW-Fed Single-Layer Based Dual Tapered-Slot Antenna

“…These types of antennas are typically based upon resonance phenomenon (e.g., dipole and monopole antennas) which is achievable usually in narrow band. Various techniques such as putting slots, parasitic element loading and defected ground plane are usually applied to make such antennas broadband [1]. To the best of the author's knowledge, this paper explains the design of the first CPW (Co-planar waveguide) fed, single-layer, dual tapered slots based broadband omnidirectional antenna with desirable down tilt for better coverage in a hemisphere.…”