scholarly journals Wideband Dual-Polarized Quasi-Omnidirectional Antenna with High Isolation for Mobile Applications in High-Speed Vehicles

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Peng Luo ◽  
Chengguo Nie ◽  
Qing Gong ◽  
Yuehui Cui
Keyword(s):  
Mobile Applications ◽  
High Speed ◽  
Impedance Bandwidth ◽  
Horizontal Polarization ◽  
Vertical Polarization ◽  
High Isolation ◽  
Omnidirectional Antenna ◽  
Vertical Slot ◽  
Dual Polarized ◽  
Very High

A new wideband dual-polarized (DP) quasi-omnidirectional antenna is proposed. The DP antenna consists of a vertical slot for horizontal polarization (HP) and a folded horizontal slot for vertical polarization (VP). A tapered strip is employed to coupling feed the vertical slot while a straight strip is used to excite the horizontal slot. Due to the coupling feed and the orthogonality between the vertical and horizontal slots, the DP antenna features a wide bandwidth and a very high isolation. The simulated isolation is higher than 70 dB, although the measured isolation is about 50 dB. As experimental results indicate, the DP antenna realizes an impedance bandwidth (BW) of 45% (1.7–2.73 GHz) with quasi-omnidirectional radiation patterns for both HP and VP. The DP quasi-omnidirectional antenna may be packaged into a radome with a shape of a blade for mobile applications in high-speed vehicles.

scholarly journals Dual-Polarized Omnidirectional Antenna With High Isolation Based on the Theory of Characteristic Modes

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 73416-73422
Author(s):  
Xi Wang Dai ◽  
Guo Qing Luo ◽  
Ya Hui Qian ◽  
Xiao Hong Zhang ◽  
Hua Yan Jin ◽  
...  
Keyword(s):  
High Isolation ◽  
Omnidirectional Antenna ◽  
Characteristic Modes ◽  
Dual Polarized

scholarly journals Broadband Dual-Polarized Multidipole Antenna for Base Station Applications

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Yuxuan Huang ◽  
Zeqi Zhu ◽  
Shuting Cai ◽  
Xiaoming Xiong ◽  
Yuan Liu
Keyword(s):  
Radiation Pattern ◽  
Base Station ◽  
Impedance Bandwidth ◽  
Frequency Bandwidth ◽  
Frequency Range ◽  
High Isolation ◽  
Small Rectangle ◽  
Additional Resonance ◽  
Dual Polarized ◽  
Better Than

A wideband dual-polarized multidipole antenna for base station applications is proposed. It consists of a pair of large square-shaped loop dipoles and a pair of small rectangle loop dipoles as radiation elements. A pair of small rectangle loop dipoles is fed by T-shaped feed structure which is in the large square-shaped loop dipoles radiating arm so that the antenna generates an additional resonance and obtains a wider bandwidth. The proposed antenna was fabricated and measured, and the results show that the antenna achieves a wide impedance bandwidth of 63.7 % with VSWR<1.5 covering the frequency range from 1.55 to 3 GHz. A high isolation is better than 29 dB within the operating frequency bandwidth. Moreover, an average gain 8 dBi and a stable radiation pattern with 3 dB beamwidth of 69° ± 4° at H-plane are obtained.

scholarly journals Ultracompact Dual-Polarized Cross-Dipole Antenna for 5G Base Station Array of Low Wind Load

2021 ◽  
Author(s):  
Biying Han ◽  
Qi Wu ◽  
Chen Yu ◽  
Haiming Wang ◽  
Xiqi Gao ◽  
...  
Keyword(s):  
Ground Plane ◽  
Wind Load ◽  
Dipole Antenna ◽  
Base Station ◽  
Impedance Bandwidth ◽  
Defected Ground Structure ◽  
Metal Mesh ◽  
Projected Area ◽  
Dual Polarized ◽  
Very High

Very high wind loads represent one of the major problems for the ultralarge-scale 5G base station array at the sub-6 GHz band, where dozens of or hundreds of antennas are used. An ultracompact dual-polarized cross-dipole antenna with an extremely small overall projected area is presented. The array with low wind load is realized by miniaturized cross dipoles and the replacement of the traditional ground plane with a defected ground structure (DGS) and metal mesh reflector. The DGS is utilized to realize size reduction and isolation enhancement. The projected area of the antenna is reduced by 70%. Therefore, each antenna in the array can be independently packaged using a streamlined radome with a low wind load. And the inter-radome spacing is large enough to make holes that are used to further reduce wind load. The antenna prototype is designed, fabricated, and measured for the sub-1 GHz band. The measured results show that the impedance bandwidth is 680-970 MHz, the polarization isolation is higher than 20 dB, and the gain is around 6.5 dBi. It is verified that the proposed ultracompact antenna of high radiation performance is very suitable for an ultralarge-scale array of low wind load in a 5G base station.

scholarly journals Design of Broadband Dual-Polarized Rectenna Array for WPT Applications

2021 ◽  
Vol 15 ◽  
pp. 376-382
Author(s):  
Guan-Pu Pan ◽  
Kuan-Chih Chiu ◽  
Tsung-Lin Li ◽  
Jwo-Shiun Sun
Keyword(s):  
Free Space ◽  
Power Transmission ◽  
Impedance Matching ◽  
Ground Plane ◽  
Impedance Bandwidth ◽  
Horizontal Polarization ◽  
Rectangular Slot ◽  
Antenna Type ◽  
Voltage Doubler ◽  
Dual Polarized

A broadband dual-polarized microstrip array antenna designed is proposed. To achieve wide 10 dB bandwidth for broadband operation, the technique of applying a ladder-shaped monopole antenna type with a rectangular slot insertion in the ground plane is implemented. The proposed design showed wide impedance bandwidth of the 1702-2755 MHz (47.2%). In addition, adding an open slot into the rectangular radiating element with an asymmetric ground plane was used and resulted in a slightly displacement of the radiation pattern. The 1 × 2 array type for two ladder-shaped patch array elements are arranged in symmetric feed network. By meticulously arrangement the two array antennas’ positions to achieved good ports isolation, with 10 dB bandwidth for the operating bands in free-space can be achieved. This antenna is used as a rectenna (rectifying antenna), which receives the RF energy of vertical and horizontal polarization wave in free space for 2.4 GHz wireless power transmission. The rectifier circuit setup using two zero biased rectifier and voltage doubler circuit. A matching network designed with small size chip components have a significant improvement in impedance matching and eliminate high order harmonics between the antenna and rectifying circuit. The proposed dual-polarized rectenna provided the RF-to-DC conversion efficiency as high as 78.8% when 14 dBm microwave power was received at 2.4 GHz with a 1 KΩ load.

scholarly journals Ultracompact Dual-Polarized Cross-Dipole Antenna for 5G Base Station Array of Low Wind Load

2021 ◽  
Author(s):  
Biying Han ◽  
Qi Wu ◽  
Chen Yu ◽  
Haiming Wang ◽  
Xiqi Gao ◽  
...  
Keyword(s):  
Ground Plane ◽  
Wind Load ◽  
Dipole Antenna ◽  
Base Station ◽  
Impedance Bandwidth ◽  
Defected Ground Structure ◽  
Metal Mesh ◽  
Projected Area ◽  
Dual Polarized ◽  
Very High

Very high wind loads represent one of the major problems for the ultralarge-scale 5G base station array at the sub-6 GHz band, where dozens of or hundreds of antennas are used. An ultracompact dual-polarized cross-dipole antenna with an extremely small overall projected area is presented. The array with low wind load is realized by miniaturized cross dipoles and the replacement of the traditional ground plane with a defected ground structure (DGS) and metal mesh reflector. The DGS is utilized to realize size reduction and isolation enhancement. The projected area of the antenna is reduced by 70%. Therefore, each antenna in the array can be independently packaged using a streamlined radome with a low wind load. And the inter-radome spacing is large enough to make holes that are used to further reduce wind load. The antenna prototype is designed, fabricated, and measured for the sub-1 GHz band. The measured results show that the impedance bandwidth is 680-970 MHz, the polarization isolation is higher than 20 dB, and the gain is around 6.5 dBi. It is verified that the proposed ultracompact antenna of high radiation performance is very suitable for an ultralarge-scale array of low wind load in a 5G base station.

scholarly journals DESIGN AND ANALYSIS OF A BROADBAND HIGH ISOLATION DUAL-POLARIZED OMNIDIRECTIONAL ANTENNA

2019 ◽  
Vol 85 ◽  
pp. 65-83
Author(s):  
Yuwei Zhang ◽  
Shu Lin ◽  
Shang Yu ◽  
Shoulan Liu ◽  
Guanjun Liu ◽  
...  
Keyword(s):  
High Isolation ◽  
Omnidirectional Antenna ◽  
Dual Polarized

scholarly journals A Horizontally Polarized Omnidirectional Antenna Using Stacked Curve Dipoles for DTV Reception

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Chuwong Phongcharoenpanich ◽  
Weerayuth Polkaew ◽  
Bancha Luadang ◽  
Prayoot Akkaraekthalin
Keyword(s):  
Parametric Study ◽  
Impedance Matching ◽  
Digital Television ◽  
Impedance Bandwidth ◽  
Antenna Gain ◽  
Frequency Range ◽  
Horizontal Polarization ◽  
Omnidirectional Antenna ◽  
Brass Sheet

This paper presents an omnidirectional antenna using stacked curve dipoles radiating horizontal polarization for digital television (DTV) reception. The proposed antenna consists of stacked curve dipoles designed on brass sheet. The parametric study is carried out for various dimensions of curve dipoles to improve the impedance bandwidth. The results show good impedance matching forS11of less than −10 dB along the frequency range from 404 MHz to 871 MHz. The antenna gain is between −10 dBi and 0.67 dBi along the frequency range from 470 to 862 MHz.

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