Omnidirectional Antenna Diversity System for High-Speed Onboard Communication

Zhang, Yongjian; Li, Yue; Zhang, Weiquan; Zhang, Zhijun; Feng, Zhenghe

doi:10.1016/j.eng.2020.10.014

Cited by 37 publications

(11 citation statements)

References 27 publications

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“…For 360°coverage, omni-directional dual-polarized antennas are commonly applied. Thus, a series of dual-polarized omni-directional antennas have been reported [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A broadband Butler-based dual-polarized omni-directional antenna

Shen

Zhang

2023

Int. J. Microw. Wireless Technol.

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This paper presents a broadband Butler-based slant ±45° dual-polarized omni-directional antenna working at the frequency band of 1.69–2.69 GHz for extending wireless communication network capacity in the limited service size. The proposed antenna realizes a 360° full coverage with wider bandwidth in a compact cylinder and increases the network capacity to 6 × 6 MIMO instead of using three traditional 2 × 2 MIMO omni-directional antennas. Theoretical analysis, simulation, and fabrication are conducted to validate the idea of the proposed omni-directional antenna. The measured results show 46% bandwidth with 15 dB return loss, 2.2 dB azimuth null and 8.9–10.5 dBi gain for port-C with 0° phase increment, and 14.1 dB azimuth null and 9.6–10.6 dBi gain for port-L/R (left/right) with ±120° phase increment, respectively.

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“…For 360°coverage, omni-directional dual-polarized antennas are commonly applied. Thus, a series of dual-polarized omni-directional antennas have been reported [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A broadband Butler-based dual-polarized omni-directional antenna

Shen

Zhang

2023

Int. J. Microw. Wireless Technol.

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“…Accordingly, various designs for smartwatch MIMO applications have been proposed in the literature. [10][11][12][13][14] To achieve high port-to-port isolation covering a wideband frequency range, characteristic mode theory was utilized in Wen et al 10 The characteristic mode theory is used to excite degenerate modes by employing ground modification and orthogonal T-shaped monopoles. However, the geometry lacks coplanar design requirements.…”

Section: Introductionmentioning

confidence: 99%

“…Polarization diversity was employed in a two-port system using smartwatch annular integrated ring. 11 Dual-polarized colocated slots were etched on a wedge profile cavity 12,13 and a cuboid cavity 14 to achieve polarization diversity resulting in higher isolation for wider bandwidth. However, the design is unsuitable for low-profile smartwatch applications.…”

Section: Introductionmentioning

confidence: 99%

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A wideband isolation technique using bezel coupled T‐type isolator for smartwatch MIMO applications

Baloch

Zahid

et al. 2022

Micro & Optical Tech Letters

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This letter presents a wideband bezel coupled T‐type isolator, decoupling two antenna elements for smartwatch multiple‐input multiple‐out applications. The antenna elements consist of PIFA antennas operating at 2.45 GHz, covering Bluetooth and Wi‐Fi bands. The proposed T‐type isolator has been installed between the antenna elements made by inserting two slits in the bezel separated by 21 mm. The separated segment of the bezel is connected with the circular ground plane by a conducting strip and an inductor. In this way, the slits offer stray capacitance, and the capacitive coupling between the T‐type isolator has been utilized to achieve a wide isolation bandwidth. Meanwhile, the isolation can also be tuned using the gaps of the slits and the inductor. The design performance has been validated in simulations and measurement. The measured impedance bandwidth is higher than 120 MHz whereas the isolation bandwidth is 790 MHz with a maximum isolation higher than 22 dB. The measured envelop correlation coefficient is below 0.01. The proposed design is a good candidate for smartwatch applications.

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“…The first is the Omni-vertical antenna and the biquad antenna. In this study, the investigated omnidirectional antenna is made of an N-type connector, and the impedance is close to 50 ohms [9]. An Omni antenna can also be an SMA type connector, with the characteristic that the more efficient the power beam is close to 100%, the better it is used for internet networks [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Implementation of an omnidirectional antenna on a 4G repeater with a working frequency of 1800 MHZ

Handayani¹,

Nasron

Arviando³

2021

tjst

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In this study, an omnidirectional antenna is used as a 4G signal amplifier with a frequency of 1800 Mhz. Omnidirectional antennas typically have a gain of about 3-12 dBi. The application of an omnidirectional antenna on a 4G signal amplifier repeater is used as a donor antenna facing the base transceiver station (BTS) source. Applying an omnidirectional antenna as a donor antenna will allow signal transmission from all directions to the BTS to be received from all directions. This antenna will serve or only emit signals in the vicinity of 360 degrees. While at the top of the antenna, there is no radiation signal. The voltage standing wave ratio (VSWR) test results with the MMANA test software get a reading of <1.5, with an impedance of 49 ohms and a gain of >6.5 dB. The radiation distribution pattern from the plotting results shows a circular spread of 360 degrees. This antenna is suitable for donor antennas that can receive signals from the BTS from all directions from the angle of incidence. From testing with an open signal application and comparing parameters before and after using a repeater, the download speed increased from 0.2 Mbps to 2.3 Mbps, and the latency increased from 159 ms to 73 ms. The scanning spectrum in auto mode gets a mid-frequency reading of 1867.20Mhz when the repeater is on. The results achieved in the service of this 4G signal booster tool are being able to understand 5th generation materials such as 5G technology. Several countries have started to study 5G technology by forming consortiums such as METIS, 5GNOW, and others.

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Omnidirectional Antenna Diversity System for High-Speed Onboard Communication

Cited by 37 publications

References 27 publications

A broadband Butler-based dual-polarized omni-directional antenna

A broadband Butler-based dual-polarized omni-directional antenna

A wideband isolation technique using bezel coupled T‐type isolator for smartwatch MIMO applications

Implementation of an omnidirectional antenna on a 4G repeater with a working frequency of 1800 MHZ

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