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  • 1.
    Amin, Yasar
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Chen, Qiang
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Zheng, Lirong
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Evolutionary Versatile Printable RFID Antennas For "Green" Electronics2012In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 26, no 2-3, p. 264-273Article in journal (Refereed)
    Abstract [en]

    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.

  • 2.
    Amin, Yasar
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Chen, Qiang
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Zheng, Lirong
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic Systems. KTH, School of Information and Communication Technology (ICT), Centres, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
    Two-arm Sinuous Antenna for RFID Ubiquitous Sensors and Wireless Applications2012In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 26, no 17-18, p. 2365-2371Article in journal (Refereed)
    Abstract [en]

    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.

  • 3. Cheng, F.
    et al.
    Lin, XianQi
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Liu, X. X.
    Song, K. J.
    Fan, Y.
    A compact dual-band bandpass SIW filter2013In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 27, no 3, p. 338-344Article in journal (Refereed)
    Abstract [en]

    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.

  • 4. Cui, J. -P
    et al.
    Yao, J.
    Hu, Xin
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Zhang, Quanlin
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    NEW BROADBAND ZERO PHASE SHIFTER BASED ON NEGATIVE REFRACTION INDEX TRANSMISSION LINE2008In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 22, no 14-15, p. 2069-2075Article in journal (Refereed)
    Abstract [en]

    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.

  • 5.
    Engström, Christian
    et al.
    Lund University, Sweden.
    Sjöberg, Daniel
    Lund University, Sweden.
    On two numerical methods for homogenization of Maxwell's equations2007In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 21, no 13, p. 1845-1856Article in journal (Refereed)
    Abstract [en]

    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.

  • 6.
    Goryashko, Vitaliy A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Yogi, Rutambhara
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    A megawatt class compact power combiner for solid-state amplifiers2014In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 28, no 18, p. 2243-2255Article in journal (Refereed)
    Abstract [en]

    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.

  • 7. Hu, J.
    et al.
    Khan, S. N.
    Xiong, J.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    CIRCULAR AXE-SHAPED PATCH ANTENNA FOR COMPACT AND DUAL BAND WIRELESS APPLICATIONS2008In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 22, no 11-12, p. 1655-1660Article in journal (Refereed)
    Abstract [en]

    A compact circular AXE-shaped patch antenna is presented for miniaturized application. The proposed design is further modified for dual band 2.4/5.5 GHz wireless application. The measured return loss is from 2.38 similar to 2.42 GHz and 5.41 similar to 5.59 GHz suitable for dual band WLAN application. Same design procedure can also be applied for miniaturized applications. The miniaturization process shifts the resonance at 1.71 GHz instead of 2.5 GHz in case of simple circular patch. The radiation pattern and gain for dual band wireless antenna is also measured and presented.

  • 8. Jin, J. Y.
    et al.
    Lin, XianQi
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Gao, X.
    Zhuang, X.
    Fan, Y.
    A dual-band power divider using parallel strip line with high isolation2012In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 26, no 11-12, p. 1594-1601Article in journal (Refereed)
    Abstract [en]

    The transmission characteristics of the parallel strip lines (PSLs) are studied. Then a novel dual-band power divider using PSLs is introduced. It consists of four pi-form arms and one 180 degrees phase swap structure. The pi-form arms are capable of achieving ideal impedance matching at two different frequency bands with an arbitrary power dividing ratio k: The 180 degrees phase swap structure is frequency independent, which is used to obtain high port to port isolation. Theoretical analysis and general design procedure of this power divider with arbitrary k and F (central frequency ratio of two different frequency bands) are presented. Then, a sample operating at 1.3 and 3.5 GHz with k = 1 and F = 2. is fabricated and tested. Experimental results show that this power divider operates at the designed dual frequency bands, and the isolation is more than 20 dB. Good agreements among theoretical, simulated, and experimental results are obtained.

  • 9. Khan, S. N.
    et al.
    Xiong, J.
    Hu, J.
    He, Sailing
    A modified coplanar monopole antenna of circular disk with an ultra wide bandwidth from 2.28 similar to 38.2 GHz2008In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 22, no 4, p. 593-598Article in journal (Refereed)
    Abstract [en]

    A simple coplanar monopole antenna of circular disk is proposed for ultra-wideband (UWB) applications. Coplanar ground plane is slightly modified with an arc-shaped cut, so that an improved impedance bandwidth, especially at the higher frequencies is achieved. The measured return loss from 2.28 similar to 38.2GHz is below -10dB and the measured radiation pattern is quasi omni-directional.

  • 10. Khan, S N
    et al.
    Yao, J
    Shuai, Z
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Modified square uwb monopole antenna for improved impedance bandwidth2008In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 22, no 14-15, p. 1883-1888Article in journal (Refereed)
    Abstract [en]

    Square monopole is modified to improve the impedance bandwidth. The modified square monopole has a step-generated circular base. The measured return loss below -10 dB is from 2.42 GHz to over 20GHz and good omnidirectional radiation pattern is also achieved.

  • 11. Khan, S. N.
    et al.
    Zhang, Q. L.
    He, Sailing
    LEFT HANDED MICROSTRIP TRANSMISSION LINE LOADED WITH COMBINATION OF SPLIT RING RESONATOR AND COMPLEMENTARY-SRR2008In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 22, no 13, p. 1857-1863Article in journal (Refereed)
    Abstract [en]

    An approach to realize left-handedness in microstrip transmission line by simultaneously loading it with split ring resonator and complementary split ring resonator is proposed. A transmission line individually loaded with either with SRR (-mu) or CSRR (-epsilon) has band rejection but when simultaneously loaded has a passband near the previously rejected band due to negative values of both -mu and -epsilon. i.e., left handedness. The design is compact, low pro. le and independent of the substrate permittivity. Simulation and experimental results are also presented and the design is suitable for devices like fiters and couplers.

  • 12.
    Lin, XianQi
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Jin, J. Y.
    Jiang, Y.
    Fan, Y.
    Metamaterial-inspired waveguide filters with compact size and sharp skirt selectivity2013In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 27, no 2, p. 224-232Article in journal (Refereed)
    Abstract [en]

    In this paper, a metamaterial-inspired miniaturization method for waveguide filter design is proposed. The transmission response and effective medium parameters of I-shaped resonator in metallic rectangular waveguide are first discussed. By embedding such an I-shaped resonator, a novel g/2-type inverter is then proposed ( g: the guided wavelength). The large effective refraction index with low loss which appears below the resonant frequency of the I-shaped resonator is skillfully exploited, and then the size of g/2-type inverter is greatly reduced with acceptable low insertion loss. The most negative permittivity of the I-shaped resonator at its resonant frequency produces an additional transmission zero which leads to sharp skirt selectivity in the upper side band. Using the novel g/2-type inverter, two improved waveguide filters are further designed with good performances. One has an extremely compact size. The other has further improved selectivity. Two such filters are finally fabricated and the measured results agree well with the simulated ones.

  • 13. Liu, J. X.
    et al.
    Khan, S. N.
    Li, H.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    SHORTED PIN CIRCULAR AXE-SHAPED PATCH ANTENNA FOR COMPACT AND DUAL BAND APPLICATIONS2008In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 22, no 14-15, p. 2105-2112Article in journal (Refereed)
    Abstract [en]

    A shorted pin circular axe-shaped antenna is analyzed for compact and dual band applications. Removing two symmetric arc-shaped areas from a simple circular patch lengthens the current path thus reduces the antenna size. Embedding and adjusting a shorting pin further shifts the resonance to a lower frequency and excites another high order mode. The frequency ratio varies between 1.639 similar to 2.616. The patch size is about 51% of the circular axe-shaped patch without shorting pin, and 85% of the simple circular patch antenna. Parametric analyses of the antenna model are presented in detail and a prototype is fabricated for experiment.

  • 14. Lundstedt, J.
    et al.
    Norgren, Martin
    KTH, Superseded Departments, Electrical Systems.
    Comparison between frequency domain and time domain methods for parameter reconstruction on nonuniform dispersive transmission lines - Abstract2003In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 17, no 12, p. 1735-1737Article in journal (Refereed)
  • 15.
    Nickelson, L.
    et al.
    Semiconductor Physics Institute, A. Gostauto 11, LT-01108 Vilnius, Lithuania.
    Asmontas, S.
    Semiconductor Physics Institute, A. Gostauto 11, LT-01108 Vilnius, Lithuania.
    Shugurov, V.
    Semiconductor Physics Institute, A. Gostauto 11, LT-01108 Vilnius, Lithuania.
    Martavicius, R.
    Electronic Systems Department, Electronics Faculty, Vilnius Gediminas Technical University, Naugarduko 41, LT-03227 Vilnius, Lithuania.
    Malisauskas, V.
    Electronic Systems Department, Electronics Faculty, Vilnius Gediminas Technical University, Naugarduko 41, LT-03227 Vilnius, Lithuania.
    Engelson, Vadim
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, PELAB - Programming Environment Laboratory.
    SIE method of analysing microwave fields of A 3D heart model2006In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 20, no 2, p. 193-206Article in journal (Refereed)
    Abstract [en]

    The Singular Integral Equations Method (SIE) used in this article allowed us to solve Maxwell's Equations for a Three-Dimensional (3D) asymmetric heart model when a microwave catheter (MC) was placed inside the model and radiated microwaves. Here we explain the main idea of our SIE method. We first separated the solution of equations from satisfying the boundary conditions. For this purpose, we found the solution of the differential equations having a point source. This fundamental solution is used in our integral representation of a problem. The integral representation automatically satisfied the differential equations but has an unknown density function which must be found from the boundary conditions. The solution of the differential equations, obtained by our SIE method, was rigorous, that is it satisfied the differential equations and all boundary conditions. The false roots did not occur when applying our SIE method. All surfaces of the heart model were defined as a triangular mesh covering the 3D heart surfaces. The heart model consisted of cardiac muscle and the right and left atriums with ventricles which were filled with blood. In this article we presented our calculations of the microwave electric field inside of a heart model. We have seen that our SIE method enabled one to optimal the size and shape of a MC when used to remove abnormal tissue in a heart model. We discovered that the electric field distribution most suitable for microwave ablation was a curved microwave catheter pressed against the lateral surface of heart atrium.

  • 16.
    Norgren, Martin
    KTH, Superseded Departments, Electrical Systems.
    A hybrid FDFD-BIE approach to two-dimensional scattering from an inhomogeneous biisotropic cylinder - Abstract2003In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 17, no 3, p. 489-490Article in journal (Refereed)
  • 17. Shen, R.
    et al.
    Lin, XianQi
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Fan, Y.
    A compact dual-band band-stop filter with high performance and controllable response2013In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 27, no 1, p. 23-29Article in journal (Refereed)
    Abstract [en]

    A fourth-order dual-band microstrip band-stop filter is proposed in this paper. Folded stepped impedance resonators are implemented as well as capacitive gap and inductive grounded via, thus the dual-band performance can be obtained in merely one resonator. Besides its compact size, simplicity, and good spurious band suppression, the filter also features its excellent mid-band rejection and skirt characteristic which is achieved by four reflection zeros adjacent to the dual resonating frequencies. Controllable response of filter is realized by tuning of gap capacity and via inductance, and the theory is verified by both simulation and experimental results that agree well with each other.

  • 18. Simovski, C. R.
    et al.
    Kondratiev, M.
    He, Sailing
    KTH, Superseded Departments, Electromagnetic Theory.
    An explicit method for calculating the reflection from an anti-reflection structure involving array of C-shaped wire elements2000In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 14, no 10, p. 1335-1352Article in journal (Refereed)
  • 19.
    Smirnov, Yury
    et al.
    Department of Mathematics and Supercomputing, Penza State University, Penza, Russia.
    Smolkin, Eugene
    Department of Mathematics and Supercomputing, Penza State University, Penza, Russia.
    Shestopalov, Yury
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    On the existence of non-polarized azimuthal-symmetric electromagnetic waves in circular metal-dielectric waveguide filled with nonlinear radially inhomogeneous medium2018In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 32, no 11, p. 1389-1408Article in journal (Refereed)
    Abstract [en]

    Propagation of monochromatic nonlinear symmetric hybrid waves in a cylindrical nonlinear inhomogeneous metal–dielectric waveguide is considered. The physical problem is reduced to solving a transmission eigenvalue problem for a system of ordinary differential equations where spectral parameters are the wave propagation constants. The setting under study is reduced to a new type of nonlinear eigenvalue problem. An analytical method for solving this problem is elaborated. For the numerical solution, a method is proposed based on solving an auxiliary Cauchy problem (a version of the shooting method). As a result of comprehensive numerical modeling, new propagation regimes are discovered.

  • 20.
    Smolkin, Eugene
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Shestopalov, Yury
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Mathematics.
    Nonlinear Goubau line: analytical-numerical approaches and new propagation regimes2017In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 31, no 8, p. 781-797Article in journal (Refereed)
    Abstract [en]

    We consider propagation of surface TE waves in the Goubau line (GL) assuming that the dielectric cover is non-linear and inhomogeneous. The problem at hand is reduced to a non-linear integral equation with a kernel in the form of the Green function of an auxiliary boundary value problem on an interval. The existence of propagating TE waves for the chosen nonlinearity (Kerr law) is proved by the method of contraction. Conditions under which several higher-order waves can propagate are obtained, and the intervals of the corresponding propagation constants are determined. For the numerical solution, a method based on solving an auxiliary Cauchy problem (a version of the shooting method) is proposed. In numerical experiment two types of nonlinearities are considered and compared: Kerr nonlinearity and nonlinearity with saturation. New propagation modes are found.

  • 21.
    Uduwawala, Disala
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Modeling and Investigation of Planar Parabolic Dipoles for GPR Applications: A Comparison with Bow-Tie Using FDTD2006In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 20, no 2, p. 227-236Article in journal (Refereed)
    Abstract [en]

    This paper presents an analysis of planar parabolic shaped dipoles using the finite difference time domain (FDTD) method. The antenna is resistor-loaded to improve the bandwidth and shielded to suit ground penetrating radar (GPR) applications. The clutter level and the GPR response of the antenna when it is operating above both lossless and lossy mediums are analyzed. The input impedance and the radiation characteristics of the antenna are also described. The results are compared with those of the resistor-loaded bow-tie to assess the antenna's performance.

  • 22. Wu, Y. S.
    et al.
    Lin, XianQi
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Cheng, F.
    Zhang, J.
    Fan, Y.
    A compact tunable bandpass filter with high selectivity and low insertion loss using novel CRLH cell2013In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 27, no 12, p. 1466-1472Article in journal (Refereed)
    Abstract [en]

    This paper presents the realization of a tunable bandpass filter with high selectivity and low insertion loss using one tunable composite right/left-handed (CRLH) cell. The tunable CRLH cell is proposed with varactor diodes loaded both on series and shut circuits. Two shut circuits are designed to form the needed paralleled C-R and L-L, by which two transmission zeros beside the passband are obtained at the same time. Each varactor diode is shunted by a lumped capacitor for lower insertion loss. The filter is tuned by only one DC bias, which results in easily control and compact size. The measured results agree well with the simulated results, and a tunable range of the center frequency from 1.75 to 2.25GHz is achieved in measurement with the insertion loss less than 2.5dB.

  • 23. Zhang, S.
    et al.
    Khan, S. N.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    MODIFIED RHOMBIC MONOPOLE ANTENNA FOR LOW LOSS FREQUENCY NOTCHED UWB APPLICATIONS2009In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 23, no 2-3, p. 361-368Article in journal (Refereed)
    Abstract [en]

    An elliptical base rhombic monopole antenna and frequency notched EBRM are proposed for low loss omni-directional ultra-wideband applications. The impedance bandwidth of simple rhombic monopole is improved with the help of semi-elliptical base and optimized for impedance matching of the order of -15 dB within impedance bandwidth. Frequency notched EBRM is realized by a U-shaped slot and optimized for WLAN. The measured results confirm impedance matching level of -15 dB, notched function with insertion level of 1.68 dB and omni-directional coverage over the impedance bandwidth.

  • 24. Zhao, K.
    et al.
    Zhang, S.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    CLOSELY-LOCATED MIMO ANTENNAS OF TRI-BAND FOR WLAN MOBILE TERMINAL APPLICATIONS2010In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 24, no 2-3, p. 363-371Article in journal (Refereed)
    Abstract [en]

    A closely-located MIMO antennas of tri-band with an inter-PIFA (Planner Inverted-F Antenna) spacing of only 20mm is proposed for WLAN mobile terminal applications. Two L-shaped slots etched on each PIFA are introduced appropriately to achieve high isolation at higher frequencies and tri-band property. The MIMO antenna can operate in the bands of 2.4-2.4812 GHz, 5.07-5.4 GHz and 5.64-6.61 GHz, and the mutual couplings are less than -16.5 dB, -27 dB and -23 dB, respectively. Radiation pattern, gain and efficiency are also measured. Our designed antenna has the advantages of closely-located structure, tri-band, high isolation, small variation of gain and high efficiency.

  • 25. Zhao, K.
    et al.
    Zhang, Shuai
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    ENHANCE THE BANDWIDTH OF A ROTATED RHOMBUS SLOT ANTENNA WITH MULIPLE PARASITIC ELEMENTS2010In: Journal Electromagnetic Waves and Applications, ISSN 0920-5071, E-ISSN 1569-3937, Vol. 24, no 14-15, p. 2087-2094Article in journal (Refereed)
    Abstract [en]

    The bandwidth of a printed antenna with a rotated rhombus slot is enhanced further by introducing 7 parasitic stripes, one of which is embedded on an edge of the rhombus slot downside while the others are on the upside. The mechanism of the wideband antenna is explained. The measured results indicate a large impedance bandwidth of 122.6% (1.59GHz-6.63 GHz) for VSWR < 2. The radiation patterns are also measured and relatively stable throughout the whole operating band.

1 - 25 of 25
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