Theoretical and experimental evaluation of the gain of log-periodic dipole antenna placed over ground plane

1994 ◽  
Author(s):  
Z. Boury
Keyword(s):  
Experimental Evaluation ◽  
Ground Plane ◽  
Dipole Antenna

scholarly journals Wideband Low-Profile Printed Dipole Antenna Incorporated With Folded Strips and Corner-Cut Parasitic Patches Above the Ground Plane

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 15537-15546 ◽  
Author(s):  
Kam Eucharist Kedze ◽  
Heesu Wang ◽  
Son Xuat Ta ◽  
Ikmo Park
Keyword(s):  
Ground Plane ◽  
Dipole Antenna ◽  
Low Profile

IMPROVEMENT OF DIPOLE ANTENNA GAIN USING 8 CBU AMC-EBG AND 8 CBU FSS

2017 ◽  
Vol 79 (4) ◽  
Author(s):  
Maisarah Abu ◽  
Siti Adlina Md Ali ◽  
Siti Normi Zabri
Keyword(s):  
Transport System ◽  
Ground Plane ◽  
Side Lobe ◽  
High Gain ◽  
Dipole Antenna ◽  
Intelligent Transport System ◽  
Antenna Gain ◽  
Radiation Patterns ◽  
Intelligent Transport

This paper investigates the performances of dipole antenna incorporated with and without 8 CBU AMC-EBG and 8 CBU FSS at 5.8 GHz. The designs are simulated on Rogers RO 3010. Due to the flexibility of the material used as a substrate, the effect of a different angle is investigated. Both 8 CBU AMC-EBG and 8 CBU FSS act as reasonably good ground plane for the dipole antenna and help improving the realised gain and improve the radiation patterns by push the front lobe at the same time reduce the side lobes. The maximum improvements led by dipole antenna with 8 CBU AMC-EBG thus 8.543 dB of realised gain achieved and the front lobe is pushed higher and the side lobe is significantly lowered than with 8 CBU FSS. The designs of dipole antenna with 8 CBU AMC-EBG and 8 CBU FSS can be applied as high gain  atenna for Intelligent Transport System (ITS).

scholarly journals Antenna Design for Directivity-Enhanced Raman Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Aftab Ahmed ◽  
Yuanjie Pang ◽  
Ghazal Hajisalem ◽  
Reuven Gordon
Keyword(s):  
Focused Ion Beam ◽  
Single Photon ◽  
Ion Beam ◽  
Ground Plane ◽  
Numerical Aperture ◽  
Circular Waveguide ◽  
Dipole Antenna ◽  
Electron Beam Evaporation ◽  
Beam Power ◽  
Raman Signal

Antenna performance can be described by two fundamental parameters: directivity and radiation efficiency. Here, we demonstrate nanoantenna designs in terms of improved directivity. Performance of the antennas is demonstrated in Raman scattering experiments. The radiated beam is directed out of the plane by using a ground plane reflector for easy integration with commercial microscopes. Parasitic elements and parabolic and waveguide nanoantennas with a ground plane are explored. The nanoantennas were fabricated by a series of electron beam evaporation steps and focused ion beam milling. As we have shown previously, the circular waveguide nanoantenna boosts the measured Raman signal by 5.5x with respect to a dipole antenna over a ground plane; here, we present the design process that led to the development of that circular waveguide nanoantenna. This work also shows that the parabolic nanoantenna produces a further fourfold improvement in the measured Raman signal with respect to a circular waveguide nanoantenna. The present designs are nearly optimal in the sense that almost all the beam power is coupled into the numerical aperture of the microscope. These designs can find applications in microscopy, spectroscopy, light-emitting devices, photovoltaics, single-photon sources, and sensing.

scholarly journals A Dual-Wideband Double-Layer Magnetoelectric Dipole Antenna with a Modified Horned Reflector for 2G/3G/LTE Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Botao Feng ◽  
Weijun Hong ◽  
Shufang Li ◽  
Wenxing An ◽  
Sixing Yin
Keyword(s):  
Double Layer ◽  
Frequency Band ◽  
Lower Layer ◽  
Low Cost ◽  
Impedance Matching ◽  
Ground Plane ◽  
Dipole Antenna ◽  
Dipole Antennas ◽  
Dipole Structure ◽  
Feeding Structure

A novel dual-wideband double-layer magnetoelectric dipole unidirectional antenna with a modified horned reflector for 2G/3G/LTE applications is proposed. Firstly, a double-layer electric dipole structure is presented to provide a dualwideband, whose folded lower layer mainly serves the lower frequency band while the inclined upper layer works for the upper frequency band. In addition, to reduce the size of the antenna and improve impedance matching, a new feeding structure designed with inverted U-shaped and tapered line is introduced. Finally, a modified horn-shaped reflector, instead of a ground plane, is employed to achieve stable and high gains. The antenna prototype can achieve a bandwidth of 24.4% (790 MHz–1010 MHz) with a stable gain of 7.2 ± 0.6 dBi for the lower band, and a bandwidth of 67.3% (1.38 GHz–2.78 GHz) with a gain of 7.5 ± 0.8 dBi for the upper band covering all the frequency bands for 2G/3G/LTE systems. To the best of our knowledge, it is the first double-layer magnetoelectric dipole antenna proposed. Compared with the existing ME dipole antennas, the proposed antenna, which is completely made of copper, can be easily fabricated at low cost and thus is practicable for 2G/3G/LTE applications.

scholarly journals Wideband circularly polarized cross‐dipole antenna with folded ground plane

2021 ◽  
Vol 15 (5) ◽  
pp. 451-456
Author(s):  
Lei Wang ◽  
Ke‐wen Chen ◽  
Quan Huang ◽  
Wei‐heng Shao ◽  
Wen‐xiao Fang ◽  
...  
Keyword(s):  
Ground Plane ◽  
Dipole Antenna ◽  
Circularly Polarized

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.

A NOVEL MAGNETO-ELECTRIC DIPOLE ANTENNA WITH MODIFIED GROUND PLANE

2016 ◽  
Vol 75 (8) ◽  
pp. 693-704
Author(s):  
Neetu ◽  
G. P. Pandey ◽  
V. N. Tiwari ◽  
S. J. Marwah
Keyword(s):  
Electric Dipole ◽  
Ground Plane ◽  
Dipole Antenna

A novel uniplanar wideband magneto-electric dipole antenna element

2017 ◽  
Vol 9 (10) ◽  
pp. 1983-1989
Author(s):  
Chen-Yang Shuai ◽  
Guang-Ming Wang ◽  
Ya-Wei Wang
Keyword(s):  
Electric Dipole ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Ground Plane ◽  
Local Area ◽  
Dipole Antenna ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Area Network ◽  
Circular Loop

A novel uniplanar wideband magneto-electric dipole antenna element is proposed in this paper. The proposed antenna is composed of the conventional bow-tie radiation patch as an electric dipole, a semi-circular loop, which works as a magnetic dipole, a coplanar ground plane, two directors with different lengths for enhancing gain, and a microstrip-to-coplanar stripline transition balun. The designed antenna adopts a small-size coplanar ground plane to achieve a uniplanar structure. Consequently, this method reduces the space size immensely and makes the antenna suitable for the array application. In addition, a tapered slot structure is utilized to improve impedance matching. The prototype of the proposed antenna was fabricated and measured. The measured results keep in good accordance with the simulated ones. The simulated results show that the proposed antenna obtains a broad impedance bandwidth of 60.5% from 2.25 to 4.20 GHz (voltage standing wave ratio [VSWR] ≤ 2) which can be applied for wireless local area network (WLAN) (2.4–2.484 GHz), worldwide interoperability for microwave access (WiMAX) (2.5–2.69/3.4–3.69 GHz), and long term evolution (LTE) (2.5–2.69 GHz). Meanwhile, the stable gain, low cross-polarization, stable unidirectional radiation patterns, and low back lobe are obtained within the operating frequency band. The array composed of the proposed antenna elements is also investigated in this paper.

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