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2008-12-30
PIER M
Vol. 5, 161-169, 2008
download: 150
Analysis of Dielectric Body by Using Volume Integral Equation Combined with Multi-Region Iterative Method
Huiqing Zhai Qiaowei Yuan Qiang Chen Kunio Sawaya
In this research, a fast approach of method of moments (MoM) for analyzing 3-D dielectric body is proposed. The unknown polarization current in dielectric body is expanded into rectangular blocks with overlapping volume sinusoidal basis functions. To accelerate the matrix-solving CPU time in MoM, the multi-region iterative method, where the overlapping blocks are used as the iteration units, is applied to solving the matrix equation in the MoM. Some numerical results are given to show that the CPU time for solving unknown currents can be reduced effectively by multi-region iterative method.
ANALYSIS OF DIELECTRIC BODY BY USING VOLUME INTEGRAL EQUATION COMBINED WITH MULTI-REGION ITERATIVE METHOD
2008-12-11
PIER M
Vol. 5, 153-160, 2008
download: 191
Design and Testing of High-Performance Antenna Array with a Novel Feed Network
Guang Yang Rong-Hong Jin Jun-Ping Geng Sheng Ye
A novel feed network for microstrip antenna array is presented. By using the novel feeding structure, a high-performance Ku-band antenna is designed and fabricated. The 32 elements of the array are arranged in a 2-by-16 configuration. The measured peak gain at centre frequency is 22.93 dBi with an aperture efficiency of 70.5%. The antenna has less than -15 dB return loss and less than -12.3 dB SLL from 11.75 GHz-12.75 GHz.
DESIGN AND TESTING OF HIGH-PERFORMANCE ANTENNA ARRAY WITH A NOVEL FEED NETWORK
2008-12-05
PIER M
Vol. 5, 137-152, 2008
download: 128
Three-Dimensional Reconstruction from Time-Domain Electromagnetic Waves
Hui Zhou Dongling Qiu Jinsong Shen Guofa Li
An iterative time-domain algorithm for reconstructing three-dimensional (3-D) objects is presented, using normalized microwave data. The incident waveform information is excluded from the cost functional by normalizing the observed and calculated fields in the frequency domain. The exciting pulse used in the reconstruction can be freely selected by considering the bandwidth of the received data. Two numerical examples are shown to demonstrate that the proposed method can rebuild an inhomogeneous object from noisy data where different waveforms in the observation and reconstruction are used. Two normalized data sets from synthetic observed data and calculated data for a known model are illustrated too.
THREE-DIMENSIONAL RECONSTRUCTION FROM TIME-DOMAIN ELECTROMAGNETIC WAVES
2008-12-05
PIER M
Vol. 5, 111-136, 2008
download: 144
A Common Theoretical Basis for Preconditioned Field Integral Equations and the Singularity Expansion Method
Robert J. Fleming
It is demonstrated that there is a common theoretical basis for the Singularity Expansion Method (SEM) and stabilized, preconditioned electric field and magnetic field integral equations (EFIE, MFIE) defining radiation and scattering from a closed perfect electric conductor in a homogeneous medium. An operator relation termed the Calderon preconditioner links the MFIE and EFIE, based on the fundamental Stratton-Chu integral representations for the problem geometry. This preconditioner is known to stabilize the ill-posed first kind EFIE, yielding the Modified EFIE (MEFIE). The same preconditioner has been applied to the weakly singular MFIE kernel, giving a Modified MFIE (MMFIE), the equation then being solved using the Fredholm determinant theory. Since this analytical integral theory is the foundation of the SEM, it follows that the Calderon preconditioner enables stabilized and common SEM representations to be defined for both the MEFIE and MMFIE. For a finite-sized object admitting only pole singularities, the solution of the preconditioned EFIE and MFIE is equivalent to the frequency-domain SEM solution. The common SEM representation differs only in the coupling coefficient terms. Coupling coefficients for the MFIE are known, however, explicit formulations for the EFIE, and the modified coupling coefficients for the MEFIE and MMFIE are new contributions.
2008-11-15
PIER M
Vol. 5, 101-109, 2008
download: 194
Radiation Properties Enhancement of Triangular Patch Microstrip Antenna Array Using Hexagonal Defected Ground Structure
Fitri Yuli Zulkifli Eko Tjipto Rahardjo Djoko Hartanto
This paper presents a hexagonal shape defected ground structure (DGS) implemented on two element triangular patch microstrip antenna array. The radiation performance of the antenna is characterized by varying the geometry and dimension of the DGS and also by locating the DGS at specific position which are found experimentally. Simulation and experimental results have verified that antenna with DGS had improved the antenna without DGS. Measurement results of the hexagonal DGS have axial ratio bandwidth enhancement of 10 MHz, return loss improvement of 35%, mutual coupling reduction of 3 dB and gain enhancement of 1 dB.
RADIATION PROPERTIES ENHANCEMENT OF TRIANGULAR PATCH MICROSTRIP ANTENNA ARRAY USING HEXAGONAL DEFECTED GROUND STRUCTURE
2008-11-10
PIER M
Vol. 5, 91-100, 2008
download: 121
Vertical Transition in Multilayer Millimeter Wave Module Using Circular Cavity
Dakui Wu Yong Fan Minghua Zhao Yong-Hong Zhang
A novel transition structure based on Substrate Integrated Circular Cavity (SICC) is proposed in this paper. The design approach has been developed for transition designing in other operating frequency. Good performance of flexibility and S-parameters were observed for the new transition structure. Different design tools were used to validate the design method.
VERTICAL TRANSITION IN MULTILAYER MILLIMETER WAVE MODULE USING CIRCULAR CAVITY
2008-10-31
PIER M
Vol. 5, 81-89, 2008
download: 128
Verification of Shadow Region Effect on Radar Cross Section of Targets Using Physical Optics Method
Hosam El-Ocla Mitsuo Tateiba
Our method that uses current generator operator assumes the current on the entire surface of conducting scatterers. While, Physical Optics (PO) method assumes that the surface current generates only on the illumination region. The effect of the shadow region on the scattering waves is, therefore, proved by comparing our exact method with PO method. In this regard, radar cross-section (RCS) is calculated for smooth concave-convex contour. We work on numerical calculation of the RCS and analyze its characteristics with different target configurations including complexity and size. Concave illumination region is postulated with considering targets are taking large sizes of about five wavelengths. Here, we assume waves propagation and scattering from targets in free space and horizontal polarization (E-wave incidence).
2008-10-31
PIER M
Vol. 5, 67-80, 2008
download: 128
Application of Array Processing Techniques in Multibaseline InSAR for High-Resolution Dem Reconstruction
Zhijie Mao Guisheng Liao
This work is concerned with generating the digital elevation models (DEMs) from the SAR images of the region of interest using multiple sensor arrays that are fixed on the distributed satellites. We present an exact estimate of the unwrapped phase and the relationship between the unwrapped phase and the terrain height. The optimum scheme that jointly processes the signals from all sensors is based on the model of the multibaseline joint block vector. The method can simultaneously coregister the SAR images, phase unwrapping and DEM generation in the presence of the large coregistration errors. The performance of our approach is verified by a series of simulation experiments based on the distributed sensor arrays.
APPLICATION OF ARRAY PROCESSING TECHNIQUES IN MULTIBASELINE INSAR FOR HIGH-RESOLUTION DEM RECONSTRUCTION
2008-10-27
PIER M
Vol. 5, 55-65, 2008
download: 97
Simulation and Realization of an Active Metamaterial Cell for GSM/UMTS
Mohamed Al-Azab
Simulation and realization of an active metamateial cell are presented. This metamaterial cell has a power loss due to resistance in the coils. This paper presents a new nanometer negative resistance MOSFET (NR-MOSFET), which is used as a controllable negative resistance to compensate for the nanometer metamaterial losses. The negative resistance was about -320Ω. A form of a lumped circuit model with active and passive resonance is presented. A negative real part of the refractive index exists in a band width from 1.11 GHz to 1.22 GHz. This model can be used as a core cell for mobile communication smart antenna.
SIMULATION AND REALIZATION OF AN ACTIVE METAMATERIAL CELL FOR GSM/UMTS
2008-10-27
PIER M
Vol. 5, 43-54, 2008
download: 108
Approximate Analytical Solutions to Nonlinear Oscillations of Non-Natural Systems Using HE's Energy Balance Method
Davoodi Ganji Salim Karimpour Seyedreza Ganji
This paper applies He's Energy balance method (EBM) to study periodic solutions of strongly nonlinear systems such as nonlinear vibrations and oscillations. The method is applied to two nonlinear differential equations. Some examples are given to illustrate the effectiveness and convenience of the method. The results are compared with exact solutions which lead us showing a good accuracy. The method can be easily extended to other nonlinear systems and can therefore be found widely applicable in engineering and other science.
APPROXIMATE ANALYTICAL SOLUTIONS TO NONLINEAR OSCILLATIONS OF NON-NATURAL SYSTEMS USING HE'S ENERGY BALANCE METHOD
2008-10-27
PIER M
Vol. 5, 25-41, 2008
download: 103
All-Optical Tunable Mirror Design Using Electromagnetically Induced Transparency
Karim Abbasian Ali Rostami Zia Koozekanani
A new and efficient proposal for all-optical tunable devices and systems using electromagnetically induced transparency (EIT) is proposed. For this purpose a slab doped with quantum dots for realization of three-level atomic system is considered. Density matrix formulation for evaluation of the proposed structure is used. The reflection and transmission coefficients of the considered slab are calculated and the related amplitude and phase quantities studied versus parameters of the structure. We show that some nanometer tuning with application of the control field is obtained. So, the proposed idea can open a new realization method of all-optical tunable devices and systems towards all-optical systems.
ALL-OPTICAL TUNABLE MIRROR DESIGN USING ELECTROMAGNETICALLY INDUCED TRANSPARENCY
2008-10-27
PIER M
Vol. 5, 15-23, 2008
download: 105
Applying Critical-Points Method in the Presence of Phase Shift Due to Feed Line
Changying Wu Kai Zhang Gao Wei Jia-Dong Xu
The critical-points method is adopted for measuring unloaded Q-factor of microwave resonators in the presence of phase shift caused by the feed line. The result is calculated from four frequencies of three points in the resonator's impedance trace. In fact, the resonator's impedance trace rotates in Smith Chart by the phase shift. If Q-factor were gotten directly from the measured impedance including feed line rather than the equivalent impedance of the resonator without feed line, the performance of measurement will be impaired. To de-embed the phase shift, objective function was introduced to find the proper rotation angle caused by the feed line instead of calibration using extra measurement. Another advantage of the proposed method lies in the fact that no special attention is needed to distinguish magnetic coupling and electric coupling. The effectiveness of the proposed method was demonstrated by one set of simulation data and two measurement examples, namely, a low Q dielectric resonator and a high Q hollow cylindrical cavity.
APPLYING CRITICAL-POINTS METHOD IN THE PRESENCE OF PHASE SHIFT DUE TO FEED LINE
2008-10-27
PIER M
Vol. 5, 1-14, 2008
download: 103
Application of a Coaxial-Fed Patch to Microwave Non-Destructive Porosity Measurements in Low-Loss Dielectrics
Alessandra Zucchelli Massimo Chimenti Edoardo Bozzi Paolo Nepa
An air-spaced coaxial-fed patch antenna to be used as a microwave sensor for non-destructive porosity measurements in lowloss dielectric materials is presented. The variation of the patch resonant frequency when it is put on the surface of the material under test is used to estimate the dielectric permittivity. Then, a standard two-phase mixture model is used to derive the material degree of porosity from the above permittivity estimate. Measurements at the 2.4 GHz ISM frequency band have been carried out on a set of polymeric samples with artificially induced porosity. The specific choice for the operating frequency is related to the final goal of applying the above microwave sensor for quality control of ceramic materials during the production process.
APPLICATION OF A COAXIAL-FED PATCH TO MICROWAVE NON-DESTRUCTIVE POROSITY MEASUREMENTS IN LOW-LOSS DIELECTRICS