scholarly journals Compact Dual-Polarized Vivaldi Antenna with High Gain and High Polarization Purity for GPR Applications

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 503
Author(s):  
Hai-Han Sun ◽  
Yee Hui Lee ◽  
Wenhao Luo ◽  
Lai Fern Ow ◽  
Mohamed Lokman Mohd Yusof ◽  
...  
Keyword(s):  
Impedance Matching ◽  
High Gain ◽  
Ultra Wideband ◽  
Compact Antenna ◽  
Oblique Position ◽  
Vivaldi Antenna ◽  
Dual Polarized ◽  
Ground Penetrating ◽  
Low Dispersion ◽  
Polarized Radiation

A compact ultra-wideband dual-polarized Vivaldi antenna is proposed for full polarimetric ground-penetrating radar (GPR) applications. A shared-aperture configuration comprising four Vivaldi elements for orthogonal polarizations is designed to reduce the low-end operating frequency and improve the port isolation with a compact antenna size. The directivity of the antenna is enhanced by the oblique position of the radiators and the implementation of a square loop reflector. Experimental results demonstrate that the antenna has very good impedance matching, port isolation, and dual-polarized radiation performance, with low dispersion characteristics across band of interest from 0.4 GHz to 3.0 GHz. GPR measurements with the designed antenna show that the antenna maintains good detection capability even for objects buried in a highly conductive soil.

Design of a high-gain dual-band antipodal Vivaldi antenna array for 5G communications

2021 ◽  
pp. 1-9
Author(s):  
Sumit Kumar ◽  
Amruta S. Dixit
Keyword(s):  
Frequency Spectrum ◽  
Impedance Matching ◽  
High Gain ◽  
Dual Band ◽  
Dual Frequency ◽  
Band Frequency ◽  
Dielectric Lens ◽  
Bottom Side ◽  
Simulation Results ◽  
Vivaldi Antenna

Abstract This paper presents a dual-band 1 × 4 antipodal Vivaldi antenna (AVA) array with high gain to operate over a dual-frequency band that covers the 5G frequency spectrum. The gain is enhanced by employing a dielectric lens (DL). The AVA array consists of four radiating patch elements, corrugations, DL, and array feeding network on the top side. The bottom side contains four radiating patches which are the mirror images of top radiating patches. The designed AVA contains 1 × 4 array antenna elements with a DL that is operating in the ranges of 24.59–24.98 and 27.06–29 GHz. The dimensions of the designed antenna are 97.2 mm × 71.2 mm × 0.8 mm. For the improvement in gain and impedance matching at the dual-band frequency, corrugation and feeding network techniques are used. The gain obtained is about 8–12 dBi. AVA array is tested after fabrication and the measured results are reliable with the simulation results.

scholarly journals Ultrawideband Low-Profile and Miniaturized Spoof Plasmonic Vivaldi Antenna for Base Station

2020 ◽  
Vol 10 (7) ◽  
pp. 2429 ◽  
Author(s):  
Li Hui Dai ◽  
Chong Tan ◽  
Yong Jin Zhou
Keyword(s):  
Radiation Pattern ◽  
Frequency Band ◽  
High Gain ◽  
Base Station ◽  
Ultra Wideband ◽  
Radiation Patterns ◽  
Low Profile ◽  
Simulation Results ◽  
Vivaldi Antenna ◽  
Good Agreement

Stable radiation pattern, high gain, and miniaturization are necessary for the ultra-wideband antennas in the 2G/3G/4G/5G base station applications. Here, an ultrawideband and miniaturized spoof plasmonic antipodal Vivaldi antenna (AVA) is proposed, which is composed of the AVA and the loaded periodic grooves. The designed operating frequency band is from 1.8 GHz to 6 GHz, and the average gain is 7.24 dBi. Furthermore, the measured results show that the radiation patterns of the plasmonic AVA are stable. The measured results are in good agreement with the simulation results.

scholarly journals Compact Enhanced CPW-Fed Antenna for UWB Applications

2021 ◽  
Vol 10 (1) ◽  
pp. 15-20
Author(s):  
H. Abdi ◽  
J. Nourinia ◽  
C. Ghobadi
Keyword(s):  
Low Cost ◽  
Impedance Matching ◽  
Ground Plane ◽  
Ultra Wideband ◽  
Compact Antenna ◽  
Low Profile ◽  
Rectangular Slit ◽  
Operating Bandwidth ◽  
Uwb Applications ◽  
Operational Range

This paper presents a compact antenna with co-planar waveguide (CPW) feed line for ultra-wideband (UWB) applications. The proposed antenna consists of a beveled radiating patch with wide rectangular slit at its upper side and a partial ground plane with insertion of symmetrically two-step beveled tapers at its center and sides, which provides a wide operating bandwidth. The antenna is integrated with narrow rectangular-shaped parasitic elements with different lengths placed adjacent to radiant patch to significantly enhance the impedance matching and bandwidth, especially at the upper frequencies. The measured results show an |S11| less than -10 dB bandwidth of 2.5-19.8 GHz with 155% fractional bandwidth. Simulation results are in good agreement with experimental measurements, which exhibits the validity of the proposed design approach. Moreover, the proposed CPW-fed antenna shows omnidirectional radiation patterns with stable gain within the operational range. The proposed compact antenna with low profile, light weight, large frequency bandwidth, ease of fabrication and low cost material is suitable for UWB applications.

Improved Characteristics of Antipodal Vivaldi Antenna for UWBRADAR Applications

2019 ◽  
Vol 9 (2) ◽  
pp. 287-294
Author(s):  
Djalal Ziani Kerarti ◽  
Fatima Zahra Marouf
Keyword(s):  
Return Loss ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Simple Design ◽  
Compact Dimension ◽  
Radar Applications ◽  
Flat Gain ◽  
Vivaldi Antenna ◽  
Wideband Radar ◽  
Improved Characteristics

Background & Objective: In this paper, a simple design of antipodal Vivaldi antenna for ultra-wideband Radar applications is presented. Methods: The antenna provided to operate across the entire UWB spectrum sins it covers a very wide frequency band from 2.43 up to 13 GHz with better return loss characteristics. In addition, the antenna offers high and flat gain in this band. The numerical designs of the antennas have been performed by using the commercially available software CST MW, which it’s printed on Taconic substrate with a dielectric constant of 4.5 and thickness 1.6 mm. Results and Conclusion: The antenna has a compact dimension of 40 × 50 mm2 achieve satisfactory impedance matching and radiation efficiency.

A Miniaturized High-Gain (MHG) Ultra-Wideband Unidirectional Monopole Antenna for UWB Applications

2019 ◽  
Vol 28 (13) ◽  
pp. 1950230 ◽  
Author(s):  
J. Vijayalakshmi ◽  
G. Murugesan
Keyword(s):  
Patch Antenna ◽  
Ground Plane ◽  
High Gain ◽  
Substrate Material ◽  
Monopole Antenna ◽  
Ultra Wideband ◽  
Defected Ground Structure ◽  
Compact Antenna ◽  
Overlay Design ◽  
Uwb Applications

A miniaturized high-gain (MHG) ultra-wideband (UWB) unidirectional monopole antenna with defected ground structure (DGS) is designed for ultra-wideband applications. The MHG antenna is printed on the FR4 substrate material with an overall size of 26.6-mm [Formula: see text] 29.3-mm [Formula: see text] 1.6-mm, which operates over the UWB frequency range and achieves the bandwidth between 3.1[Formula: see text]GHz and 10.6[Formula: see text]GHz. This high-gain unidirectional antenna exhibits a peak gain of 7.20[Formula: see text]dB with an efficiency of 95%. The compact antenna is a simple overlay design of circular and rectangular patches with the partial ground plane exhibiting high gain and better directivity. The overlay patch antenna acts as the radiator for wider bandwidth compared to the fundamental design of patch antenna and is matched to an SMA connector via 50[Formula: see text][Formula: see text] microstrip feed line. These simulated results are presented using HFSS software package. The designed antennas are fabricated and validated by using Agilent Vector Analyzer.

Ultra-wideband and high gain antipodal tapered slot antenna with planar metamaterial lens

2021 ◽  
pp. 1-11
Author(s):  
Ziye Wang ◽  
Zhengwei Yang ◽  
Xiao Zhao ◽  
Linyan Guo ◽  
Minjie Guo
Keyword(s):  
Ground Penetrating Radar ◽  
Imaging System ◽  
Single Layer ◽  
High Gain ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Planar Lens ◽  
Unit Cells ◽  
Ground Penetrating

Abstract To solve the problems of low gain, narrow bandwidth, and poor radiation directivity of conventional ground penetrating radar antenna, this paper proposes an ultra-wideband and high-gain antipodal tapered slot antenna (ATSA) with planar metamaterial lens. As a constituent part of this lens, a new non-resonant metamaterial unit cell is introduced and analyzed by the full-wave simulation tool. The single-layer planar lens composed of the designed unit cells with different sizes is placed in the maximum radiation direction of the ATSA to greatly enhance its radiation capability. The proposed planar lens antenna has a wide impedance bandwidth of 107.4% (2.41–8 GHz) and −3 dB gain bandwidth of 54.5% (4–7 GHz), respectively. The gain increases averagely by 6.0 dB in the whole operating frequency band, and the peck gain reaches 15.4 dBi at 5.5 GHz. And its excellent performance shows a high application prospect in ground penetrating radar and microwave imaging system.

scholarly journals Dual-Polarized Dual-Loop Double-Slot Antipodal Tapered Slot Antenna for Ultra-Wideband Radar Applications

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1377
Author(s):  
Guangyao Yang ◽  
Shengbo Ye ◽  
Feng Zhang ◽  
Yicai Ji ◽  
Xiaojuan Zhang ◽  
...  
Keyword(s):  
Low Frequency ◽  
High Gain ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Loop Structure ◽  
Cross Polarization ◽  
Dual Polarized ◽  
Wideband Radar ◽  
Better Than

The miniaturized high-gain antenna is required in portable, ultra-wideband radar systems. However, the miniaturization, ultra-wideband and high gain often restrict each other in the antenna design. In this paper, a dual-polarized, double-slot, antipodal tapered slot antenna with a double-layer, dual-loop structure and novel slot edges is presented. The proposed magnetic dual-loop structure has the capacity to reduce the low cut-off frequency of the double-slot tapered slot antenna by weakening the resonance and coupling. In addition, the high gain, low sidelobe level (SLL), and low cross-polarization level are achieved in the boresight direction. A novel gradient slot profile is designed to improve the low-frequency directivity of the tapered slot antenna without affecting the matching. To feed the antenna elements, a kind of wideband, balun-divider structure is designed. The dual-polarized antenna is combined by two orthogonal elements in a cross configuration without galvanic contact or influence to performance. The measured results show that the impedance bandwidth of the proposed antenna is 0.6~4 GHz, and the maximum gain is 11 dBi. The isolation between the two antenna ports is better than 32 dB, and the cross-polarization discrimination (XPD) is better than 20 dB.

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