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

Abstract

This paper describes a printed wideband low profile omnidirectional dual-polarized antenna, which is a combination of vertical polarization (VP) and horizontal polarization (HP) elements. The VP element printed on a double-layered disk-shaped substrate is a modified monopole with loadings. The introduction of the material of the dielectric substrate can reduce the profile height in the polarized direction to 0.08λ L (the wavelength at the lowest frequency). And loading metallic cylindrical block and shorting-posts in the dielectric substrate to improve the bandwidth are realized by using metalvias. The HP element consists of a printed 8-element circular connected Vivaldi antenna array, and each element contains a director in the slot for the improvement of radiation pattern's out-of-roundness. Both the simulated and measured results indicate that operating bands of 2.2-4.52 GHz for VP and 2.4-3.8 GHz for HP. This proposed antenna has good isolation and omnidirectional patterns with the out-of-roundness less than 2.5 dB in the azimuth plane for both VP and HP, and it can be applied in mobile communication systems.

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].…”

Broadband dual‐polarized omnidirectional antenna with simple feeding structure

“…A large number of antennas have been developed to achieve a dual‐polarized omnidirectional radiation. These antennas comprise of two different radiation elements designated for VP and HP individually.…”

“…A large number of antennas [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] have been developed to achieve a dual-polarized omnidirectional radiation.…”

“…[15][16][17] These wideband designs suffered a bulky configuration, which is problematic in some applications where a low profile is typically required. For a low profile, Zhang et al 18 employed a VP element printed on a double-layered substrate with a total thickness of 11-mm (0.08λ min ), which has a considerable high cost in realization. In Reference 19, a low-profile monopole element was combined with a ring radiator consisting of four printed dipoles to achieve a wideband VP/HP omnidirectional radiation and a 0.11λ min profile.…”