| 1. |
- Amin, Yasar, et al.
(författare)
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Evolutionary Versatile Printable RFID Antennas For "Green" Electronics
- 2012
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Ingår i: Journal Electromagnetic Waves and Applications. - : Taylor & Francis. - 0920-5071 .- 1569-3937. ; 26:2-3, s. 264-273
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Tidskriftsartikel (refereegranskat)abstract
- The development of low cost directly printable RFID tag antennas is essential for item level tracking. We present evolutionary design approach to achieve robust extremely versatile RFID antennas on paper/flexible substrates which allow a simple integration directly on, e.g., paperboard in a roll-to-roll production line. Fully integrated printed tags for "green" electronics are designed for operability in frequencies 866-868 MHz & 902-928 MHz. We present benchmarking results for various challenges of antennas in terms of ruggedness, reliability and flexing performance.
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| 2. |
- Amin, Yasar, et al.
(författare)
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"Green" Wideband Log-Spiral Antenna for RFID Sensing and Wireless Applications
- 2012
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Ingår i: Journal of Electromagnetic Waves and Applications. - UK : Taylor & Francis. - 0920-5071 .- 1569-3937. ; 26:14-15, s. 2043-2050
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Tidskriftsartikel (refereegranskat)abstract
- The novel idea of integrating RFID with sensors along with other wireless applications by using single tag antenna is implemented, by fabricating proposed antenna using state-of-the-art inkjet printing technology on commercially available paper substrates. For the first time, a parametric analysis is performed for realization of planar log-spiral antenna on paper for operational range from 0.8-3.0GHz, which also exhibits excellent coverage throughout numerous RFID ISM bands, and for other wireless applications. The ANSYS HFSS tool is used to design and predict the performance of the proposed antenna in terms of radiation pattern and input impedance.
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| 3. |
- Amin, Yasar, et al.
(författare)
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Two-arm Sinuous Antenna for RFID Ubiquitous Sensors and Wireless Applications
- 2012
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Ingår i: Journal Electromagnetic Waves and Applications. - UK : Taylor & Francis. - 0920-5071 .- 1569-3937. ; 26:17-18, s. 2365-2371
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Tidskriftsartikel (refereegranskat)abstract
- For the first time, two-arm planar sinuous antenna is demonstrated to realize the emerging concept of integrating RFID functionalities along with sensors and other wireless applications for "green" electronics. In-depth, parametric analysis is performed for the proposed antenna which is fabricated on a paper substrate using revolutionary inkjet printing technology to develop a system-level solution for ultra-low-cost mass production of multipurpose wireless tags in an approach that could be easily expanded to other microwave and wireless "cognition" applications. The proposed antenna exhibits excellent performance throughout several RFID ISM bands and for other wireless applications in its operational range from 0.8 to 3.0 GHz.
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| 4. |
- Cheng, F., et al.
(författare)
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A compact dual-band bandpass SIW filter
- 2013
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Ingår i: Journal Electromagnetic Waves and Applications. - : Taylor & Francis. - 0920-5071 .- 1569-3937. ; 27:3, s. 338-344
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Tidskriftsartikel (refereegranskat)abstract
- A novel method for the design of substrate integrated waveguide (SIW) dual-band bandpass filter is presented in this paper. Dual-band response is achieved by TE101 mode and diagonal TE201 (TE102) mode. The resonant frequency of TE101 mode can be adjusted by the location of perturbation vias while the resonant frequency of diagonal TE201 (TE102) mode keeps unchanged. A design example with second-order filter response is given and verified by experiments. The vertically stacked SIW resonators are used here to save the size.
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| 5. |
- Costanza, Gabriele, et al.
(författare)
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Time domain analysis of higher order modes induced power dissipation in accelerating cavities
- 2017
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Ingår i: Journal of Electromagnetic Waves and Applications. - : Informa UK Limited. - 0920-5071 .- 1569-3937. ; 31:17, s. 1843-1863
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Tidskriftsartikel (refereegranskat)abstract
- We give a semi-analytical method for the calculation of the transient power and energy dissipated in the cavity walls of an accelerating structure due to the excitation of the higher order modes by a sequence of accelerating bunches. We treat the case where more than one bunch is present in the structure at the same time. The dissipated power is evaluated using the Lagrangian formalism and the dissipation function. Both the dissipated power from the transient fields, present when the bunch is inside the cavity, and from the time harmonic fields, present when the bunch has left the cavity, are included in the evaluations. This method is applied to the six-cell elliptic medium beta cavities for the LINAC of the European Spallation Source. The simulations constitute a thorough test of the dissipated power of the design.
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| 6. |
- Cui, J. -P, et al.
(författare)
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NEW BROADBAND ZERO PHASE SHIFTER BASED ON NEGATIVE REFRACTION INDEX TRANSMISSION LINE
- 2008
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Ingår i: Journal Electromagnetic Waves and Applications. - : Informa UK Limited. - 0920-5071 .- 1569-3937. ; 22:14-15, s. 2069-2075
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the design of one dimensional broadband phase shifters based on a new class of negative refraction index transmission line. The proposed phase shifter here consists of conventional microstrip line and Negative Refraction Index (NRI) transmission line (TL) in which ideal operational amplifiers are applied to form the periodically loaded negative-impedance-converted inductors and capacitors. It is demonstrated that variations in inductors and capacitors can produce arbitrary phase shifts while maintaining the same overall length. Also, the NRI-TL is non-dispersive so that the new phase shifter can be used in many new broadband devices.
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| 7. |
- Engström, Christian, et al.
(författare)
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On two numerical methods for homogenization of Maxwell's equations
- 2007
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Ingår i: Journal Electromagnetic Waves and Applications. - : Taylor & Francis. - 0920-5071 .- 1569-3937. ; 21:13, s. 1845-1856
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Tidskriftsartikel (refereegranskat)abstract
- When the wavelength is much larger than the typical scale of the microstructure in a material, it is possible to define effective or homogenized material coefficients. The classical way of determination of the homogenized coefficients consists of solving an elliptic problem in a unit cell. This method and the Floquet-Bloch method, where an eigenvalue problem is solved, are numerically compared with respect to accuracy and contrast sensitivity. Moreover, we provide numerical bounds on the effective permittivity. The Floquet-Bloch method is shown to be a good alternative to the classical homogenization method, when the contrast is modest.
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| 8. |
- Goryashko, Vitaliy A., et al.
(författare)
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A megawatt class compact power combiner for solid-state amplifiers
- 2014
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Ingår i: Journal Electromagnetic Waves and Applications. - : Informa UK Limited. - 0920-5071 .- 1569-3937. ; 28:18, s. 2243-2255
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Tidskriftsartikel (refereegranskat)abstract
- We propose a compact multiport two-stage combiner capable of handling peak power up to 10MW at the UHF band and suitable for particle accelerator applications. The detailed electromagnetic and thermal simulations of the combiner operating at the ESS specifications of 400kW at 352MHz are presented. At the first stage, the power is combined to a 100kW level by means of a non-resonant 12-way radial combiner, which is assumed to be fed by 8kW solid-state amplifiers. At the second stage, a waveguide combiner with T-shape couplers separated by a half-wavelength of the fundamental waveguide mode is used in order to bring the combined power to the required level. The combiner is broadband and has a relative power non-uniformity less than 5% over a 10MHz frequency band around the central frequency. The size of the proposed combiner is several times smaller than the existing ones. We also present low-power measurement results of a prototype of the radial combiner.
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| 9. |
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| 10. |
- Gustafsson, Mats
(författare)
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RCS reduction of integrated antenna arrays with resistive sheets
- 2006
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Ingår i: Journal Electromagnetic Waves and Applications. - : Informa UK Limited. - 1569-3937 .- 0920-5071. ; 20:1, s. 27-40
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Tidskriftsartikel (refereegranskat)abstract
- Edge diffraction call be a major source of high radar visibility for integrated array antennas. In this paper, it is shown that tapered resistive sheets at the edges of the array can be used to transform the scattering properties of the antenna to that of a metallic plate and hence reduce the radar cross section. Numerical examples of kill array of self-complementary patches and a, bandpass frequency selective radome are presented to illustrate the. results. The RCS reduction is very good for TE polarization but, not IS efficient for the TM polarization.
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