A Horizontally Polarized Omnidirectional Antenna With a Reflector for Ceiling-Mounted Indoor Applications

Abstract

Abstract-A novel wideband horizontally polarized omnidirectional antenna (HPOA) with an electrical conductor reflector is proposed for the 4th generation (4G) Long Term Evolution (LTE) applications. The proposed antenna consists of four pairs of printed dipoles distributed on the front and back of the substrate, and a star-shape patch integrated with stepped parallel strip lines constitutes a balun for the unbalance-balance transition from the coax feeding to the antenna. Both simulated and measured reflection coefficients (S 11 ) demonstrate a wide −10 dB impedance bandwidth of 39.6%, from 1.82 to 2.72 GHz. This band covers PCS, UMTS, LTE 2300, LTE 2500, WLAN and Bluetooth bands. The presented antenna has a peak gain of 3.2 and 4.0 dBi at 1.95 and 2.48 GHz, respectively, and an omnidirectional radiation pattern in E-plane. HPOA may be suitable for ceiling-mounted indoor 4G applications.

A broadband horizontally polarised omnidirectional antenna with stable radiation patterns

“…In the existing literatures, varieties of HPOAs have been proposed for wireless communication system. Such as classical Alford antenna in [5] and its modified type in [6], Square loop antennas composed of four printed dipoles in [7, 8], circular loop antennas composed of printed dipoles in [9, 10], and circular loop antenna designed by using tightly coupling method in [11]. Conventional Alford and modified Alford antennas are proposed in [5, 6].…”

Enhanced Bandwidth of a Horizontally Polarized Omnidirectional Printed Antenna Array Based on Dual-Dipole Structure

“…The concept of rotating electric field method is applied to conventional slot dipoles in [6] and an antenna array in [7], but their relative bandwidths are 15.4% and 39.4%, respectively. In addition, some new techniques are employed in [8][9][10]. The antenna in [8] with four pairs of printed dipoles distributed on the front and back of the substrate and the antennas [9] consisting of 3, 4 or 5 printed dipoles possess a bandwidth of 39.6% and 45.5%, respectively.…”

“…In addition, some new techniques are employed in [8][9][10]. The antenna in [8] with four pairs of printed dipoles distributed on the front and back of the substrate and the antennas [9] consisting of 3, 4 or 5 printed dipoles possess a bandwidth of 39.6% and 45.5%, respectively. A tune disk with four square-shaped perturbations and four pairs of tapered parallel transmission lines are utilized in [10].…”

A Wideband Horizontally Polarized Omnidirectional Antenna With Coupling Lines

“…Relative Bandwidth Size Average Gain [6] 31.20% R = 25 mm 2.5 dBi [7] 31% R = 50 mm 0.9 dBi [8] 59% R = 70 mm 0 dBi [9] 41% R = 50 mm Not Given [10] 43% 84 mm × 84 mm 2 dBi This Work 51% 85 mm × 85 mm 2.5 dBi…”

“…Its relative bandwidth was 41%. Zhang et al proposed a similar antenna with a reflector in [10], and its relative bandwidth was about 43%.…”