scholarly journals Base Station Antenna with Enhanced Cross Polarization Discrimination Performance by Using Horizontal Meandered Dipole and Vertical Parasitic Elements

2019 ◽  
Vol 8 (2) ◽  
pp. 28-38
Author(s):  
O. M. Kadagan ◽  
C. Turkmen ◽  
M. Secmen
Keyword(s):  
Frequency Band ◽  
Ground Plane ◽  
Discrimination Performance ◽  
Base Station ◽  
Image Theory ◽  
Antenna Design ◽  
Cross Polarization ◽  
Laboratory Environment ◽  
Maximum Gain ◽  
Cst Microwave Studio

This study is related with the design of a ± 45° dual polarized base station antenna with improved cross-polarization discrimination (XPD) values. Parasitic elements are added to antenna design formed by orthogonal two compact meandered dipole above ground plane. The antenna designed with CST Microwave Studio program has VSWR ≤ 2 within 1.71-2.69 GHz frequency band, which covers GSM 1800/3G/LTE bands. The antenna has minimum of 0 dBi gain in the beamwidth of 120° ( 60°) at azimuth plane (ϕ = 0°) along the band, and XPD values being minimum of 2 dB at 1.71-2.4 GHz for  60° without parasitic elements are improved to 10 dB with parasitic elements. This design initially had two horizontal straight monopoles on the ground plane perpendicular to each other. Afterwards, antenna with microstrip balun feed applied but the XPD values were not appropriate to expected results. Because of that, by using image theory, vertical parasitic elements were added to get appropriate XPD values. Later, meandered structure used to make antenna smaller. Finally, according to base station applications, antenna frequencies optimized to 1.71 GHz and 2.69 GHz. The designed and optimized antenna produced and measured in laboratory environment. Return losses for port 1 and port 2 are measured above the 10 dB and isolation between the port 1 and port 2 are measured above the 20 dB. In addition, the maximum gain values are measured between 3 dB and 7 dB in 1.71 GHz and 2.69 GHz frequency band.  Finally, XPD values are measured more than 10 dB in bandwidth.

Directivity enhancement by layered radomes

1995 ◽  
Vol 73 (7-8) ◽  
pp. 444-451
Author(s):  
R. Zhou ◽  
L. Shafai
Keyword(s):  
Ground Plane ◽  
Single Layer ◽  
Image Theory ◽  
Antenna Design ◽  
Optimum Length ◽  
Integral Equation Methods ◽  
Antenna Directivity ◽  
Layered Dielectrics ◽  
The Moment ◽  
Low Permittivity

Single and layered radomes are often used to protect radiating elements. A two-dimensional analysis is used to investigate their influence on the antenna directivity and radiation patterns. Image-theory and integral-equation methods are used to formulate the problem for a line source and layered dielectrics of finite length over a ground plane, and solved numerically using the moment method. It is shown that, for a sufficiently long single-layer slab, the directivity enhancement is approximately equal to the square root of its relative permittivity. Properly truncating the slab can even improve the directivity. The optimum length of a finite dielectric slab is determined to maximize the directivity. For multilayer slabs, the directivity enhancement is much greater and they can be used with low-permittivity dielectrics to simulate a single-layer one of higher permittivity. Frequency dependency of the enhanced gain is also studied. Useful information for how to incorporate the radome parameters into the antenna design and use it for gain or directivity enhancement is provided.

scholarly journals A Wideband Dual-Polarized Antenna Using Planar Quasi-Open-Sleeve Dipoles for Base Station Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Guan-xi Zhang ◽  
Li Sun ◽  
Bao-hua Sun
Keyword(s):  
Return Loss ◽  
Ground Plane ◽  
Base Station ◽  
Cross Polarization ◽  
High Frequencies ◽  
Feeding Structure ◽  
Polarization Characteristics ◽  
Dual Polarized ◽  
Dual Polarized Antenna ◽  
Better Than

A wideband dual-polarized antenna for WLAN, WiMAX, and LTE base station applications is presented in this paper. The proposed antenna consists of two pairs of orthogonal planar quasi-open-sleeve dipoles along the centerlines, a balanced feeding structure and a square ground plane. The planar quasi-open-sleeve dipole comprises a pair of bowtie-shaped planar dipoles with two parallel curve parasitic elements. The introduced parallel curve parasitic elements change the path of the current of the original bowtie-shaped planar dipoles at high frequencies and hence wideband characteristic is achieved. Two pairs of the planar quasi-open-sleeve dipoles placed orthogonally further broaden the bandwidth of the antenna with dual-polarization characteristics. The proposed antenna achieves a 10-dB return loss bandwidth from 2.32 to 4.03 GHz (53.9% bandwidth) using the planar quasi-open-sleeve dipole structures. The isolation between the two ports remains more than 32 dB in the whole bandwidth. Measured results show that the proposed antenna keeps the cross-polarization under −33 dB and the front-to-back ratio better than 15 dB in the operating band. The antenna has an area of 0.3λ  × 0.3λat 2.32 GHz making it easy to be extended to an array element.

scholarly journals Design of Dual Notch UWBMIMO Antenna with Defected Ground Structure.

2019 ◽  
Vol 9 (2S3) ◽  
pp. 318-322
Keyword(s):  
Dielectric Constant ◽  
Frequency Band ◽  
Ground Plane ◽  
Radiation Efficiency ◽  
Dual Band ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Maximum Gain ◽  
Notch Band

In this paper A dual band notched MIMO antennais designed with defected ground structure as ground plane and its characteristics are analyzed. The antenna covers UWB frequency ranging from 3.1-10.6 GHz with single notch band characteristics with maximum gain of 3.7 dB. The antenna provides radiation efficiency of 94% with front to back to ratio of 64%. The simulated studied is carried for many frequency band applications. The designed antenna shows patterns similar to that of a the dipole. The substrate used to design this antenna is FR4 withdimensions of 26mm x40mmx1.6mm and dielectric constant of 4.4.The notch bands are at WLAN and WiMax frequencies.

scholarly journals Dual-Polarized Cross Bowtie Dipole for 3G and LTE Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Zhi-Ya Zhang ◽  
Jia-Yue Zhao ◽  
Qiongqiong Liu ◽  
Guang Fu
Keyword(s):  
Mobile Communication ◽  
Ground Plane ◽  
Base Station ◽  
Cross Polarization ◽  
Impedance Characteristic ◽  
High Isolation ◽  
Circular Patch ◽  
Base Station Antennas ◽  
Dual Polarized ◽  
Peak Gain

A dual-polarized cross bowtie dipole element with parasitical circular patch and vertical metal cylinders for base station antennas is presented. A pair of orthogonal cross bowtie dipoles, with a reflector ground plane, is used to obtain the two linear polarizations. Besides two inverted L-shaped feed strips and two shorted feed baluns, parasitical circular patch is introduced to improve the impendence bandwidth and vertical metal cylinders are employed to decrease the lateral dimensions of the antenna. A wideband impedance characteristic of about 45.6% for VSWR ≤ 1.5 (+45° polarization) and VSWR ≤ 1.5 (−45° polarization) ranging from 1.76 to 2.80 GHz is obtained. Moreover, the stable peak gain, unidirectional radiation patterns, high isolation between the two orthogonal polarizations, and low cross-polarization over the whole operating band are also achieved. The proposed antenna is very suitable for potential base station applications in mobile communication such as TD-SCDMA, WCDMA, and CDMA2000 and LTE applications.

A Novel Patch Antenna Design with Slotted Ground Plane for Satellite Communications

2017 ◽  
Vol 49 (004) ◽  
pp. 767--772
Author(s):  
G. AHMAD ◽  
M. I. BABAR ◽  
M. IRFAN ◽  
M. ASHRAF ◽  
T. JAN
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
Satellite Communications ◽  
Antenna Design

Quad-Band multi-polarized antenna with modified electric-inductive−capacitive resonator

2021 ◽  
pp. 1-12
Author(s):  
Ghanshyam Singh ◽  
Binod Kumar Kanaujia ◽  
Vijay Kumar Pandey ◽  
Sachin Kumar
Keyword(s):  
Communication Systems ◽  
Ground Plane ◽  
Axial Ratio ◽  
Antenna Design ◽  
Planar Antenna ◽  
Rectangular Slot ◽  
Printed Circuits ◽  
Rectangular Patch ◽  
Easy Integration ◽  
Defected Ground Plane

Abstract A compact circularly polarized (CP) patch antenna is presented for modern communication systems. The prospective antenna consists of a microstrip-line inset-fed rectangular patch and a defected ground plane. A rotated rectangular slot and a modified electric-inductive-capacitive (m-ELC) resonator are introduced in the patch and the ground plane to achieve multiband behaviour. A corner of the radiating patch is truncated and an arrow-shaped stub is introduced for generating circular polarization. The physical area of the substrate is 0.26λ0 × 0.22λ0, and the radiator size is 0.16λ0 × 0.14λ0, where λ0 is the free-space wavelength estimated at the lowest frequency. The measured (S11≤-10 dB) bandwidths of the antenna are 80 MHz (3.58%) at 2.23 GHz, 75 MHz (2.64%) at 2.84 GHz, 80 MHz (2.50%) at 3.19 GHz, and 70 MHz (1.82%) at 3.83 GHz. The measured 3-dB axial ratio bandwidths are 40 MHz (1.41%), 100 MHz (3.12%), and 60 MHz (1.57%) at 2.84, 3.20 and 3.82 GHz, respectively. The proposed planar antenna design does not need dual-feed or multi-layered patches for achieving multiple CP bands. It offers easy integration with the printed circuits of the communication systems.

Performance Evaluation of SDR Blade RF using Wide-band Monopole Antenna for Spectrum Sensing Applications

2021 ◽  
Vol 36 (4) ◽  
pp. 419-424
Author(s):  
Ahmed Ibrahim ◽  
Wael Ali ◽  
Hassan Aboushady
Keyword(s):  
Performance Evaluation ◽  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Software Defined Radio ◽  
Ground Plane ◽  
Wide Band ◽  
Monopole Antenna ◽  
Antenna Design ◽  
Wireless Technologies ◽  
Sensing Applications

A spectrum-sensing algorithm is used to detect the available and the occupied frequency bands. The wideband antenna design approach is used for a microstrip fed monopole antenna that can be used for various wireless technologies such as GSM, UMTS, LTE, and WiFi operating at different frequencies from 1.25 to 3 GHz. The antenna is constructed from two copper layers of rectangular radiator and a partial ground plane. These layers are printed on an RO4003 substrate with dimensions 60 x 80 mm2. The antenna is experimentally fabricated to verify the simulation predictions and good matching between simulated and measured results is achieved. The wide-band antenna is tested by connecting it to the receiver of the Blade-RF Software Defined Radio (SDR) platform. A matlab script is then used to control the SDR board and to perform Spectrum Sensing for Cognitive Radio Applications.

scholarly journals CPW-fed circularly-polarized antenna array with high front-to-back ratio and low-profile

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 651-655 ◽  
Author(s):  
Yilin Liu ◽  
Kama Huang
Keyword(s):  
Antenna Array ◽  
Coplanar Waveguide ◽  
Ground Plane ◽  
Axial Ratio ◽  
Antenna Design ◽  
Impedance Bandwidth ◽  
Feeding Method ◽  
Circularly Polarized ◽  
Low Profile ◽  
Novel Design

Abstract A novel design of a coplanar waveguide (CPW) feed antenna array with circular polarization (CP) and a high front-to-back ratio is described. The proposed CP array is achieved by using a compact CPW–slotline transition network etched in the ground plane. The measured results show that this kind of feeding method can improve the impedance bandwidth, as well as the axial ratio bandwidth of the CP antenna array and provide adequate gain. The proposed array can achieve a 6.08% impedance bandwidth and a 4.10% CP bandwidth. Details of the antenna design and experimental results are presented and discussed.

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