| 1. |
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| 2. |
- Tripathy, Malay Ranjan, et al.
(författare)
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A diamond-shaped fractal bow-tie antenna for THz applications
- 2019
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Ingår i: Advances in Communication, Cloud, and Big Data. - Singapore : Springer. - 9789811089107 - 9789811089114 ; , s. 97-104
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Bokkapitel (refereegranskat)abstract
- A compact multiband diamond-shaped fractal bow-tie terahertz antenna is designed on FR4_epoxy substrate with permittivity 4.4. The dimension of substrate is 4 × 6 × 1.5 mm 3 . Multi-bands are obtained in S 11 versus frequency plots. The effects of creating defects in the ground plane of the antenna were studied and analyzed to get the optimized performance of antenna in the frequency bands at 0.500, 0.560, and 0.594 THz, respectively. © Springer Nature Singapore Pte Ltd. 2019.
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| 3. |
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3-D band-stop FSS for X-band and Ku-band
- 2017
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Ingår i: 2017 Progress In Electromagnetics Research Symposium - Fall (PIERS - FALL). - : Electromagnetics Academy. - 9781538612118 - 9781538612125 ; , s. 671-675
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Konferensbidrag (refereegranskat)abstract
- A 3-D Frequency Selective Surface (FSS) with band-stop characteristics for X-band and Ku-band is proposed. A 3-D FSS unit cell is constructed by analyzing two 2-D FSS's. The size of the 3-D FSS unit cell is 5 mm × 5 mm wherein two layers of FR4 substrate with respective widths of 0.762 mm and 0.5 mm are used. Dual stop bands are obtained with this FSS unit cell around 10 GHz and 17.4 GHz; where a wide stop-band of 5.2 GHz is obtained. The parametric study carried out on the proposed design in terms change in nature of substrate, alternate use of different substrates and variation in angle of incidence. The 3-D FSS shows its band rejection property X-band and Ku-band respectively. Ansoft HFSS commercial EM solver software is used to carry out the simulation work.
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| 4. |
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A wideband frequency selective surface reflector for 4G/X-Band/Ku-Band
- 2018
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Ingår i: Progress In Electromagnetics Research C. - : Electromagnetics Academy. - 1937-8718. ; 81, s. 151-159
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Tidskriftsartikel (refereegranskat)abstract
- A Frequency Selective Surface (FSS) reflector with wideband response for 4G/X-band/Ku-band is proposed. The wideband FSS reflector consists of cascaded dual-layer patch FSS which is etched on separate layers of FR4 substrate. The targeted frequency range is 5–16 GHz. A wide stopband of 10.4 GHz (100% percent bandwidth) is obtained with two layers in cascade. The Equivalent Circuit (EC) method is used to approximate the simulated results. An extensive parametric study is also carried out to understand the effect of various combinations of FSS layers and their disposition. A panel of final FSS is fabricated where measured and simulated results agree well.
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| 5. |
- Choudhary, Vipin, et al.
(författare)
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A compact multi-band slotted circular patch MIMO antenna with defective ground surface for wireless application
- 2017
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Ingår i: 2017 4th International Conference on Signal Processing and Integrated Networks (SPIN). - : IEEE conference proceedings. - 9781509027972 ; , s. 33-37
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Konferensbidrag (refereegranskat)abstract
- A compact multi band slotted two elements MIMO antenna is designed on FR4 substrate with the dimensions 60×60×1.5 mm3 and an εr of 4.4. To achieve high isolation between the radiation elements, a Defected Ground Surface (DGS) technique is applied. The isolation between the elements and gain both increased considerably. In the simulated and measured return loss vs frequency results, multi bands are obtained. The maximum isolation is obtained as -36.32 dB at 8.8 GHz in the measured results.
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| 6. |
- Choudhary, Vipin, et al.
(författare)
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A printed lens in antenna’s aperture to improve the performance of UWB-radar system
- 2023
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Ingår i: International Journal of Systems Assurance Engineering and Management. - : Springer. - 0975-6809 .- 0976-4348. ; 14, s. 603-609
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Tidskriftsartikel (refereegranskat)abstract
- We present a printed lens for radar applications. The structure of the presented lens consists of an array of modified micro-strip lines, which is positioned in the antenna’s aperture on the same planar substrate. Simulations show that the gain and directivity increase with the proposed lens in a wide band frequency band. The proposed design is insensitive to rotation of the antenna. This paper focuses on real industrial applications and problems. Further, we show that the lens can be used to improve the object detection ability of an ultrawide band radar system, which is used in industrial applications such as non-destructive monitoring of built-structures and for use in the renovation process. The signal to noise ratio is improved. Furthermore, we show how the microwave lens can also be used to reduce the clutter in applications where the complex refractive index of objects is determined. Further, different simulated results (for different cases) are compared, presented and concluded.
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| 7. |
- Choudhary, Vipin, et al.
(författare)
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Metamaterial-based-absorber to improve the performance of S and X band radar systems
- 2020
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Ingår i: 2020 7th International Conference on Signal Processing and Integrated Networks (SPIN). - : IEEE. - 9781728154756 ; , s. 126-129
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Konferensbidrag (refereegranskat)abstract
- We present a metamaterial-based dual band microwave-absorber for radar applications, the structure of which consists of an array of closed ring resonators on a low profile substrate. Simulations show high absorption (absorptance > 90%) at dual frequencies i.e. 3 GHz and 9 GHz. The proposed absorber is insensitive to polarization (i.e., absorptance taking into account both co- and cross-polarization of reflected waves). Further, we show how the microwave absorber can be used to improve the performance of a radar system for short range applications, when positioned between the transmit and receive antennas. The error in estimated target distance is reduced and clutter reduction is improved.
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| 8. |
- Gupta, Ashta, et al.
(författare)
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A compact four-element MIMO antenna for WLAN/WiMAX and HiperLAN applications
- 2016
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Ingår i: 2016 IEEE Annual India Conference (INDICON). - 9781509036462 - 9781509036479
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Konferensbidrag (refereegranskat)abstract
- A compact four-element multi-input-multi-output (MIMO) antenna useful for wireless ultra-wide band (UWB) applications and systems is introduced in this paper. The frequency bandwidth obtained with the proposed UWB antennas is 1.5 to 12.5 GHz. The substrate material used is FR4 with dielectric coefficient of 4.4. The dimension of the substrate is 30×60×1.5 mm3 and the dielectric loss tangent is 0.02. The Envelope Correlation Coefficient (ECC) and Diversity gain are calculated in this paper with values within their acceptable limits.
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| 9. |
- Ivanchenko, Igor, et al.
(författare)
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Determination of effective permittivity of metamaterial antenna cells
- 2016
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Ingår i: 2016 10th European Conference on Antennas and Propagation. - : Institute of Electrical and Electronics Engineers (IEEE). - 9788890701863
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Konferensbidrag (refereegranskat)abstract
- A numerical-analytical method of reconstructing complex frequency-dependent permittivities is proposed. Measurements of the transmission coefficient for three typical metamaterial antenna units are performed and the frequency-dependent effective complex permittivity of the units is reconstructed in a wide frequency range.
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| 10. |
- Khulbe, Manisha, et al.
(författare)
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Inverse Scattering and Imaging Using Second Order Optical Nonlinearities
- 2019
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Ingår i: 2019 6th International Conference on Signal Processing and Integrated Networks, SPIN 2019. - : IEEE. - 9781728113791 ; , s. 1086-1089
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Konferensbidrag (refereegranskat)abstract
- In this paper a mathematical technique is developed to find the parameters of a medium in terms of its scattered electromagnetic fields. Optical nonlinearity plays an important role in finding the scattering parameters of a medium. Using perturbation theory and nonlinear inverse scattering techniques with first order, second order and third order optical nonlinearity we find scattered electromagnetic fields. Using error minimization techniques parameters are estimated in term of permittivity and permeability up to second order. © 2019 IEEE.
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