| 1. |
- Chen, Zihan, et al.
(author)
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Design of Compact Passive Tag Antenna for Practical RFID Applications
- 2014
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In: PIERS 2014 GUANGZHOU. - : ELECTROMAGNETICS ACAD. - 9781934142288 ; , s. 680-685
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Conference paper (peer-reviewed)abstract
- The communication quality between an RFID tag and a reader in a RFID network, especially the parameters of the passive tag antenna such as reading range, directivity and return loss, is affected by several factors from the environment. For practical RFID application, since the environment is complex and volatile, these factors include metallic surface of products, absorptions and impacts from neighbor tag antennas like scattering and mutual coupling. In this paper, it consists of the analysis of impacts caused by these factors and the design of passive tag antennas with resonant frequency 915 MHz able to be used in practical RFID applications against those impacts. Comparing with former ones, the proposed antenna reduces the size of the tag antenna to approximately commercial standard (18 mm x 48 mm x 3 mm) by using certain structures applied in the unit cell of metamaterial or HIS, while the properties including directivity, return loss and input impedance are still appropriate for RFID applications. Simulation results from HFSS indicates that at 915 MHz, the return loss can be about 21 dB, as most of the power can be radiated into the space towards the receiver. Meanwhile, the input impedance Z(0) = 9.4738 + j143.9189 Omega, perfectly matching the impedance of the RFID chip placed on the top surface of the antenna. The above improved parameters play an important role in prolonging the reading range.
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| 2. |
- Huang, Q., et al.
(author)
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Ultracompact adiabatic tapered coupler for the Si/III-V heterogeneous integration
- 2014
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In: Progress in Electromagnetics Research Symposium. - 9781934142288 ; , s. 920-924
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Conference paper (peer-reviewed)abstract
- An ultracompact bi-sectional tapered coupler, suitable for adiabatic mode transformation between a common single mode SOI strip waveguide and a Si/III-V hybrid waveguide, is proposed for Si/III-V heterogeneous integration. Since the bi-sectional tapered coupler mimics a semi-3D taper and avoids exciting unwanted high-order modes in the thick p-InP cladding layer (which is removed in the first tapered section), the length of the adiabatic mode coupler can be dramatically shortened. In the proposed structure, the length of the bi-sectional tapered coupler can be as short as 9.5 μm with a large fundamental mode-coupling ratio (over 95%) in a bandwidth of ∼ 100 nm, and provides ±100nm tolerance to misalignment even when the bonding layer is as thick as 50 nm.
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| 3. |
- Kolitsidas, Christos I., et al.
(author)
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Edge effects in a strongly coupled dipole element array in triangular lattice
- 2014
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In: Progress in Electromagnetics Research Symposium. - 9781934142288 ; , s. 487-490
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Conference paper (peer-reviewed)abstract
- In this work the focus is on the impact of edge effects in the equilateral triangular lattice of a strongly coupled dipole antenna array. A novel wideband strongly coupled, single polarized, dipole element is designed and studied in a triangular grid. The antenna element operates in 6: 1 bandwidth ratio. Our analysis for the edge effects is based the finite × infinite approach with multiple rows taken into account in order to capture the effects on the different edges that appear in triangular grids. The effects at the E-edge are studied as it is the plane where the currents are truncated. At the E-edge the variation on the behavior is mainly due to lack of closely coupling fields. Using the finite × infinite approach the variations along the E- edge of the array are studied for both rectangular and triangular grid. Finally, periodic resistive loading was used on the dipoles to dissipate the waves produced from the edges and smooth the impedance behavior along the array row.
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| 4. |
- Kuzmina, E., et al.
(author)
-
Higher-order surface modes in the Goubau line
- 2014
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In: Progress in Electromagnetics Research Symposium. - : Electromagnetics Academy. - 9781934142288 ; , s. 2605-2609
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Conference paper (peer-reviewed)abstract
- Existence of the higher-order surface waves of the Goubau line is proved and their structure is analyzed. An efficient computational approach is proposed based on numerical solution to initial-value problems obtained by the parameter differentiation. Several applications and further research directions are discussed.
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| 5. |
- Liu, H., et al.
(author)
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Printed inverted-F MIMO antenna for TD-LTE mobile terminal
- 2014
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In: Progress in Electromagnetics Research Symposium. - 9781934142288 ; , s. 1562-1566
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Conference paper (peer-reviewed)abstract
- With the rapid growth and development of the mobile communication technologies in recent years, many mobile communication technologies appeared one after another, of particu-lar concern is 3GPP long term evolution (LTE). TD-LTE is growing rapidly in China and is also widely considered in the forth generation (4G) mobile communication now. MIMO technology, which utilizes multiple antenna to improve spectrum efficiency and increase the system channel capacity, is one of the 4G key technologies. In this paper a MIMO antenna, operating on TD-LTE frequency band for TD-LTE mobile ter-minal is designed. The proposed MIMO antenna consists of two modified IFA structures has the advantage of compact structure and multiband for 4G handheld devices. The antenna designed to cover the TD-LTE frequency band of 1880-1900MHz and 2575-2635MHz for China Mobile. The simulated and test results show that the isolation and S11 parameters of the proposed MIMO antenna can meet TD-LTE mobile communication requirements.
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| 6. |
- Pan, T., et al.
(author)
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Compact circularly polarized RFID tag antenna with an embedded U-shaped feedline for metallic surfaces
- 2014
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In: Progress in Electromagnetics Research Symposium. - 9781934142288 ; , s. 1567-1571
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Conference paper (peer-reviewed)abstract
- A passive radio frequency identification (RFID) tag antenna with circular polarization (CP) radiation is proposed to operate at 902-928MHz and mount on metallic surfaces. A U-shaped terminal short-circuited feedline welded to a tag-chip is embedded in a rectangular slot to achieve a coupled feeding and a good impedance matching. By employing two truncated corners and two L-shaped slots with unequal length on the patch, a good left-hand circular polarization (LHCP) and compact size are obtained. The measured impedance bandwidth of the antenna is 85MHz (875-960 MHz), while the simulated 3-dB CP bandwidth is 6MHz (912-918 MHz). The proposed tag antenna shows reasonable read ranges when mounted on the metal plate in the following experiment.
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| 7. |
- Shestopalov, Yury, 1953-, et al.
(author)
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Inverse problem method for permittivity reconstruction of two-layered media : numerical and experimental results
- 2014
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In: Progress in Electromagnetics Research Symposium. - : Electromagnetics Academy. - 9781934142288 ; , s. 2610-2613
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Conference paper (peer-reviewed)abstract
- This study employs the technique developed in [1-3] and deals with complex permittivity reconstruction of layered materials in the form of diaphragms (sections) in a single-mode waveguide of rectangular cross section from the transmission coefficient measured at different frequencies.
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| 8. |
- Smirnov, A. P., et al.
(author)
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Numerical analyze of waveguide transmission coefficient with non-uniform dielectric slab
- 2014
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In: Progress in Electromagnetics Research Symposium. - : Electromagnetics Academy. - 9781934142288 ; , s. 2619-2621
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Conference paper (peer-reviewed)abstract
- Propagation in the time domain of electromagnetic waves in a rectangular waveguide with a non-uniform dielectric slab is considered. Electromagnetic field components are computed and investigation of energy transport in the guide is performed by using Finite Difference Time Domain (FDTD) method in different frequency ranges. Parallel high performance FDTD solver, based on Maxwell equations approximation in integral form on Yee lattice and developed by the paper authors is used. A method for calculating the transmission coefficient with respect to all the problem parameters is proposed. The method is based on the analysis of the amplitude of the scattered wave derived from FDTD numerical solution. The pure scattered field method is proposed to specify the waveguide mode with respect to numerical dispersion. Computations for nonstationary Maxwell equations system are performed for the H10-mode scattering from a dielectric slab placed in the waveguide. Multiple numerical computations for the corresponding large-scale problems have been performed on Lomonosov Moscow State University IBM BlueGene/P supercomputer. Using the methods described above, we compute the values of the waveguide transmission, attenuation and propagation factors in a wide range of permittivity and different positions of the dielectric slab inclusions. Continuous curves on the complex plane describing the dependence of the transmission coefficient on the dielectric constant are obtained. The comparison of the transmission coefficient calculated by the present approach and the volume integral equation method is performed.
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| 9. |
- Sun, Fei, et al.
(author)
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The Mikaelian's magnetic lens for static magnetic field enhancement
- 2014
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In: Progress in Electromagnetics Research Symposium. - 9781934142288 ; , s. 184-186
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Conference paper (peer-reviewed)abstract
- Traditional lenses for static magnetic field concentration are often closed structures and the enhanced DC magnetic fields are inside these structures. The static magnetic flux diverges very quickly in the free space outside these closed lenses. In this paper, we extend the Mikaelian's lens which has been widely used for focusing the light wave to design a non-closed DC magnetic lens which can concentrate the DC magnetic field and give a good DC magnetic field enhancement in free space regions even after a certain distance from the back surface of the lens. Numerical simulations verify the performance of the device.
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