Broadband dual-polarized omnidirectional antenna based on magnetic dipoles

Abstract

A broadband dual-polarized omnidirectional antenna based on magnetic dipoles is presented. The proposed antenna consists of a cone radiator for vertical polarization (VP) and eight magnetic dipole elements for horizontal polarization (HP). The dipole elements are arranged around the ground plane to greatly reduce the volume of the proposed antenna. The overall volume of the antenna is only π × 75.5 mm × 75.5 mm × 35 mm (about π × 0.25 λ 0 × 0.25 λ 0 × 0.12 λ 0 at 1 GHz). The dipole elements are carefully designed to achieve the bandwidth about 28.7% from 2.03 GHz to 2.71 GHz. The bandwidth of the cone radiator is about 92% covering from 1 GHz to 2.7 GHz with band reject from 1.63 GHz to 1.7 GHz. The port isolation is more than 30 dB at the whole operation band. A good agreement between the simulated and measured results evidently validates this proposed antenna.

A Dual-Polarized Omnidirectional Antenna With Two Kinds of Printed Wideband Low-Profile Radiating Elements

“…In addition, it also has relatively low profile for the entire structure, good isolation and wide bandwidth. [11] 102.6 mm 0.671-3.58 GHz (137%) 0.12 1.7-3 GHz (55%) Higher than 25 dB [12] 35 mm 1.7-3.…”

“…In [9], a novel structure of four pairs of orthogonal dipoles is presented for an omnidirectional dual-polarized antenna which can achieve 30% bandwidth with the port isolation about 25 dB, and the profile height can reach 100 mm. In the light of the current literature, the common method to obtain omnidirectional dual-polarized antenna is combining different VP and HP antennas [10][11][12][13][14][15], among which modified monopoles are used for VP elements, while printed circular loop antennas or concentrically arranged dipoles are designed for the HP elements. These antennas can cover wide operating band, but the profile heights of VP elements are not lower than 0.12λ L .…”

Design and Analysis of a Broadband High Isolation Dual-Polarized Omnidirectional Antenna

“…As shown in Figure 1(b), VP element is a modified lowprofile monopole with a top-loading metal disk shorted to the stair-like ground plane by four equallyspaced metallic pins. This structure of a four-metal-pins shorted patch has been widely utilized for a low-profile monopole [3,4,14,[18][19][20][21][22][23]. However, we have made a modification by mounting four-opening pins on the ground plane, which is able to compensate the reactance for bandwidth improvement.…”

“…Even though the 5G communication technology is coming and has become one of the hot research issues, because of the large amount of coverage, 4G antennas will still play a key role in the communication service in the further years. Moreover, owing to the merits of 360 • full coverage radiation in the horizontal plane and supporting a free alignment between receiving and transmitting antennas, omnidirectional antennas have been widely used in base stations [2][3][4][5]. On the other hand, due to the properties of enhancing the channel capacity and mitigating multipath fading, dual-polarized antennas possessing two orthogonal electrical field components in the direction of radiation are also extensively applied in many modern communication systems [6].…”

A low-profile and wideband crossed dipole antenna based on AMC reflector for circularly polarized applications

“…The CP radiation is traditionally generated from two orthogonal dipole antennas, which should be excited by equal magnitudes and a 90°phase difference [4,5,6,7]. However, these designs suffer from bidirectional radiation with a low broadside gain.…”