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2008-03-20
PIER C
Vol. 1, 241-249, 2008
download: 142
Comparative Study of the Resonant Frequency of E-Plane and h -Plane Coupled Microstrip Patch Antennas
Mukul Khan Indrani Ray Durbadal Mandal Anup Bhattacharjee
When a microstrip patch antenna is brought closer than 0.2λ to an identical patch the resonant frequency of that antenna changes from the designed frequency. In this paper numerical results for the resonant frequency are presented from a theoretical analysis of the mutually coupled H-plane microstrip patch antennas with confirming experimental results. We have also established the relation between resonant frequency of E-plane coupled and H-plane coupled microstrip patch antennas.
COMPARATIVE STUDY OF THE RESONANT FREQUENCY OF E-PLANE AND H-PLANE COUPLED MICROSTRIP PATCH ANTENNAS
2008-03-19
PIER C
Vol. 1, 229-240, 2008
download: 106
Dynamical Problem of a Rotational Charged Dielectric Rigid Body in a Uniform Magnetic Field
Guo-Quan Zhou Xiao Xiao
Based on the theory about charge moment tensor and the magnetic moment of a rotational charged body, and by means of Eulor's equation for a rotational rigid body in classic mechanics, the Lagrangian and the dynamic equation of a charged dielectric rigid body under a uniform magnetic field has been derived; Also two symmetric simple cases have been solved or analyzed under condition of slow rotation and no gravitation, the corresponding invariants have also been found.
DYNAMICAL PROBLEM OF A ROTATIONAL CHARGED DIELECTRIC RIGID BODY
 IN A UNIFORM MAGNETIC FIELD
2008-03-19
PIER C
Vol. 1, 211-228, 2008
download: 124
A New Linear Space-Time Block Code for Wireless Channels with Correlated Fading Coefficients
Khashayar Nobandegani Paeiz Azmi
In the recent years, extensive studies have been done to design space-time codes appropriate for communications over fading channels in multiple input-multiple output (MIMO)systems. Most of these designs have been based upon the assumption that the channel fading coefficients are uncorrelated hence independent jointly Gaussian random variables. Naturally the best strategy in such situations that the elements of the channel matrix are independent is to employ diversity techniques to combat the adverse effects of these fading media and thus the most famous space-time codes, i.e., orthogonal and trellis codes have been designed with an eye to realizing the maximum attainable diversity order in a MIMO system. In this paper, we will remove this almost ever-present yet practically difficult to meet condition and shall introduce a new linear space-time block code that due to having some inherent redundancy as well as diversity is wellsuited to correlated fading channels. We will discuss the properties of the proposed code, derive its maximum likelihood (ML) decoder and provide simulation results which show its superiority to the highly used orthogonal space-time block codes in a wide range of signal to noise ratios in correlated fading channels.
A NEW LINEAR SPACE-TIME BLOCK CODE FOR WIRELESS CHANNELS WITH CORRELATED FADING COEFFICIENTS
2008-03-02
PIER C
Vol. 1, 199-209, 2008
download: 119
Fractional Surface Waveguide
Husnul Maab Qaisar Naqvi
Fractional curl operator has been utilized to study the fractional order surface waveguides. Fractional order surface waveguides may be regarded as intermediate step of two surface waveguides which are related through the principle of duality. Fractional eigenvalue equations are examined at the interface between dielectric medium and free space, for various values of fractional order parameter result in different fractional surface wave modes.
FRACTIONAL SURFACE WAVEGUIDE
2008-03-01
PIER C
Vol. 1, 191-198, 2008
download: 1007
Input Impedance of Rectangular Microstrip Antennas on Non-Radiating Edges for Different Feed Sizes
Durbadal Mandal Rajib Kar Anup Bhattacharjee
Closed-form expressions for the input impedance of halfwavelength rectangular microstrip antennas fed by coaxial connectors of different sizes at any point on any one of the non-radiating edges and open-circuited at the other ends are derived. Good agreement between computed and measured data is obtained.
INPUT IMPEDANCE OF RECTANGULAR MICROSTRIP ANTENNAS ON NON-RADIATING EDGES FOR DIFFERENT FEED SIZES
2008-03-02
PIER C
Vol. 1, 185-189, 2008
download: 94
Design of Compact Planar Inverted-L Diversity Antenna for Handheld Terminals
Hai-Lin Xiao Zai-Ping Nie
Antenna diversity is a well-known technique to enhance the performance of wireless communication systems. In order to create an antenna diversity system on a wireless device, two or more antenna elements could be placed in positions. However, it is difficult to implement multiple antennas on handheld terminal. A compact planar inverted-L diversity antenna for handheld terminals is provided. Three diversity antennas operating at 2.15 GHz are designed. The isolation is found to be better than 13 dB and the usable bandwidth is about 13% in measurement. The measured radiation patterns are obtained that the proposed diversity antenna attains 2 dBi gain.
DESIGN OF COMPACT PLANAR INVERTED-L DIVERSITY ANTENNA FOR HANDHELD TERMINALS
2008-02-28
PIER C
Vol. 1, 177-184, 2008
download: 187
A Novel Wideband Bandpass Filter Based on Complementary Split-Ring Resonator
Xin Lai Qi Li Pei-Yuan Qin Bian Wu Chang-Hong Liang
This paper presents a novel wideband bandpass filter making use of complementary split-ring resonator (CSRR) as the basic resonant unit. The resonant characteristic of CSRR is carefully studied through full wave analysis. The coupling of CSRR structure is very strong that can be used to realize wideband filter with small insertion loss. A filter with center frequency at 3.5 GHz, passband from 3.1 GHz to 3.8 GHz is designed and fabricated. The measured results are in good consistent with simulated results.
A NOVEL WIDEBAND BANDPASS FILTER BASED ON COMPLEMENTARY SPLIT-RING RESONATOR
2008-02-28
PIER C
Vol. 1, 169-176, 2008
download: 111
Full Wave Analysis of Two Layered Orthogonal Microstrip Transmission Lines Based on Spectral Domain Method
Reza Rezaiesarlak Farrokh Hojjat-Kashani Esfandiar Mehrshahi
In this paper, using moment method in the spectral domain, full wave analysis of two orthogonal microstrip transmission lines in two layered PCB board is presented. First, using 1-dimensional spectral domain method, the propagation constants and the currents on each line are obtained, without considering of the other line. Then, using Galerkine's method in 2 dimensional spectral domain, the scattering parameters of the structure are calculated. The results of our analysis are compared by the quasi-TEM approach. Comparisons show good agreement between our results and quasi-TEM approach.
FULL WAVE ANALYSIS OF TWO LAYERED ORTHOGONAL MICROSTRIP TRANSMISSION LINES BASED ON SPECTRAL DOMAIN METHOD
2008-02-27
PIER C
Vol. 1, 159-168, 2008
download: 99
Modified Algorithm for Real Time SAR Signal Processing
Yee Kit Chan Voon Koo Boon-Kuan Chung Hean-Teik Chuah
The generation of the picture out of the SAR raw data is a computational intensive task. Both range compression and azimuth compression utilized Fast Fourier Transform (FFT) algorithms and Inverse Fast Fourier Transform (IFFT) in order to perform convolution with respective reference signal. Thus FFT and IFFT occupied about 70% of the total computation operation in SAR image formation. In this paper a modified algorithm based on conventional FFT is proposed to optimize the computation performance. It is shown that the proposed algorithm can essentially achieve better performance with minimum computational burden compare to conventional FFT.
MODIFIED ALGORITHM FOR REAL TIME SAR SIGNAL PROCESSING
2008-02-13
PIER C
Vol. 1, 143-157, 2008
download: 197
Improved Adaptive Bacteria Foraging Algorithm in Optimization of Antenna Array for Faster Convergence
Tanumay Datta Iti Misra Biswa Mangaraj Sk Imtiaj
This paper proposes an improved adaptive approach involving Bacterial Foraging Algorithm (BFA) to optimize both the amplitude and phase of the weights of a linear array of antennas for maximum array factor at any desired direction and nulls in specific directions. The Bacteria Foraging Algorithm is made adaptive using principle of adaptive delta modulation. To show the improvement in making the algorithm adaptive, results for both adaptive and nonadaptive algorithms are given. It is found that Adaptive Bacteria Foraging Algorithm (ABFA) is capable of improving the speed of convergence as well as the precision in the desired result.
IMPROVED ADAPTIVE BACTERIA FORAGING ALGORITHM IN OPTIMIZATION OF ANTENNA ARRAY FOR FASTER CONVERGENCE
2008-02-07
PIER C
Vol. 1, 131-141, 2008
download: 113
A New Mathematical Proposal for Generation of Shape Invariant Potentials and Optical Medium Using Supersymmetric Quantum Mechanics
Hossein Motavali Ali Rostami
A new mathematical method and proposal for generation of shape invariant potentials using supersymmetric quantum mechanics is introduced. For this purpose the potential term in the Schrodinger equation is expressed in terms of the super potential. The obtained equation transformed into well known ordinary second order differential equation. Using standard technique, the Nikiforov-Uvarov (NU) method the superpotential in the Schrodinger equation is expressed in terms of the parameters appeared in the NU-approach concluding to a nonlinear differential equation. By solving the obtained equation and using relation between superpotential and potential the shape invariant potentials are obtained. The proposed method is general and straightforward for introducing of the shape invariant potentials.
2008-02-03
PIER C
Vol. 1, 123-130, 2008
download: 120
Homomorphic Enhancement of Infrared Images Using the Additive Wavelet Transform
Huda Ashiba Kamal Awadalla Said El-Halfawy Fathi Abd El-Samie
This paper presents a new enhancement technique for infrared images. This technique combines the benefits of homomorphic image processing and the additive wavelet transform. The idea behind this technique is based on decomposing the image into subbands in an additive fashion using the additive wavelet transform. This transform gives the image as an addition of subbands of the same resolution. The homomorphic processing is performed on each subband, separately. It is known that the homomorphic processing on images is performed in the log domain which transforms the image into illumination and reflectance components. Enhancement of the reflectance reinforces details in the image. So, applying this process in each subband enhances the details of the image in each subband. Finally, an inverse additive wavelet transform is performed on the homomorphic enhanced subbands to get an infrared image with better visual details.
HOMOMORPHIC ENHANCEMENT OF INFRARED IMAGES USING THE ADDITIVE WAVELET TRANSFORM
0000-00-00
PIER C
Vol. 1, 113-122, 2008
download: 415
A Multimode Interference Coupler with Exponentially Tapered Waveguide
Ji-Jiang Wu
An exponentially tapered structure is introduced into multimode interference (MMI) devices. Compared with a parabolically tapered structure,which has been successfully used in MMI devices, this structure can further reduce the length of these devices. The performances of the 1 × 2 MMI coupler with exponentially tapered structure,such as the optical transmission,the wavelength response and the fabrication tolerance,are investigated by the 2D finite difference beam propagation method. Results show that the exponentially tapered MMI coupler exhibits a similar property to that with a parabolically tapered structure.
A MULTIMODE INTERFERENCE COUPLER WITH EXPONENTIALLY TAPERED WAVEGUIDE
2008-01-31
PIER C
Vol. 1, 105-111, 2008
download: 153
Broadb and High-Gain E-Shaped Microstrip Antennas for High-Speed Wireless Networks
Tayeb Denidni N. Hassaine Qinjiang Rao
New electromagnetically coupling fed low profile broadband high gain E-shaped microstrip antennas (MSA) were proposed for high speed wireless networks in IEEE 802.11 a and j standards. The proposed antenna uses an E-shaped microstrip patch covered by a radome and fed by an electromagnetically coupled strip. To validate this concept, a single antenna element and a sub-array were designed, built and measured. The measured results indicate that the element and the sub-array cover the band from 4.8 to 6.0 GHz (return loss < −10 dB) and produce a gain of 8 dBi and 11 dBi, respectively. The developed prototypes may find their applications in wireless communication networks as mobile or base antennas.
BROADB AND HIGH-GAIN E-SHAPED MICROSTRIP ANTENNAS FOR HIGH-SPEED WIRELESS NETWORKS
2008-01-29
PIER C
Vol. 1, 95-103, 2008
download: 84
A Closed Form Analytic Solution for Coupled Nonuniform Transmission Lines
Mohammad Khalaj-Amirhosseini
A closed form analytic solution is introduced for arbitrary Coupled Nonuniform Transmission Lines (CNTLs). First, the differential equations of CNTLs are written as a suitable matrix differential equation. Then, the matrix differential equation is solved to obtain the chain parameter matrix of CNTLs. Afterward, the voltage and current of lines are obtained at any point using the chain parameter matrix. The validation of the introduced solution is studied, finally.
A CLOSED FORM ANALYTIC SOLUTION FOR COUPLED NONUNIFORM TRANSMISSION LINES
2008-01-29
PIER C
Vol. 1, 87-93, 2008
download: 95
Study on an UWB Planar Tapered Slot Antenna with Gratings
Hai-Yang Xu Hou Zhang Jian Wang
A new miniature ultra-wideband exponential tapered slot antenna with gratings, which is fed by a 180 degree microstrip phase shifter network, has been introduced in this paper. The switch characteristic and the reflecting loss of the phase shifter is also analyzed. Some subminiature rectangular gratings are etched at the front and back end, as a result of which, the inner band characteristic is improved and the frequency band of the antenna is extended to more than 3 : 1 (S11 < −10 dB). The radiation pattern has good direction property in the entire bandwidth and favorable symmetrical endfire radiation characteristic as well as more than 10 dB gain in the central frequency band.
STUDY ON AN UWB PLANAR TAPERED SLOT ANTENNA WITH GRATINGS
2008-01-29
PIER C
Vol. 1, 73-85, 2008
download: 121
A Uniqueness Theorem for Initial-Boundary Value Problems in Tellegen Medium
Burhanettin S. Altan
Uniqueness of the initial-boundary value problems for a Tellegen media is studied. Initial-boundary value problems for a Tellegen Medium are summarized for the sake completeness; the conservation of energy for such a medium is reviewed. Sufficient conditions are given for the positive definiteness of the energy stored in a Tellegen media due to the fields. It is shown that the if the energy stored in a Tellegen medium is positive definite, then an initialboundary value problem for a Tellegen media has only one solution, if it exists.
2008-01-29
PIER C
Vol. 1, 63-72, 2008
download: 113
Linear Antenna Array Design with Use of Genetic, Memetic and Tabu Search Optimization Algorithms
Yavuz Cengiz Hatice Tokat
Antenna array design techniques are focused on two main classes: uniformly spaced antenna arrays and the non-uniform spacing case. These include techniques based on mathematical programming, such as constrained programming and non-linear programming. More recently, meta-heuristics approaches have been successful at designing antenna arrays [5]. In this work, this paper presents efficient methods of genetic algorithm (GA), memetic algorithm (MA) and tabu search algorithm (TSA) for the synthesis of linear antenna design. We present three examples of antenna array design to compare the efficiency of the algorithms through simple design to complex design. The GA, TSA and MA has been used to optimize the spacings between the elements of the linear array to produce a radiation pattern with minimum SLL and null placement control.
LINEAR ANTENNA ARRAY DESIGN WITH USE OF GENETIC, MEMETIC AND TABU SEARCH OPTIMIZATION ALGORITHMS
2008-01-19
PIER C
Vol. 1, 55-61, 2008
download: 100
Study on Two Compact CPW-Fed Bandpass Filters Using Dual-Mode Patch Resonator
Jian Wang Hou Zhang Lai-Xuan Ma Hai-Yang Xu
Two compact CPW-fed band-pass filters using dual-mode resonator are proposed and studied - one resonator with two unequal corner-cut elements located at two diagonal corners of a conventional micro-strip patch and the other with unequal crossed slots at the center of a conventional micro-strip patch. In this paper, adjusting the length of corner-cut element and the crossed slot are mainly studied. By use of HFSS, the simulation results are given and analyzed. The simulation results show that the pass-band of the filter(a) may be adjusted over the bandwidth range from 4.9% to 16%, and the pass-band of the filter(b) may be adjusted over the bandwidth range from 5.4% to 8.2%, and filter(b) with cross-slot has smaller size than filter(a) with corner-cut to meet the same application demand. According to the simulation results, to design a filter which works at 1.65 GHz, the configuration of filter(b) is adopted owning to smaller size. finally, filter(b) with len1=20.2mm and len2=20.4mm is fabricated and measured, which has a minimum insertion loss of 2.48 dB in its pass-band.
STUDY ON TWO COMPACT CPW-FED BANDPASS FILTERS USING DUAL-MODE PATCH RESONATOR
2008-01-15
PIER C
Vol. 1, 45-54, 2008
download: 171
V-Shaped Monopole Antenna for Broadband Applications
Ali Dastranj Ali Imani Hamid Reza Hassani
In this paper, design and analysis of a novel broadband V-shaped monopole antenna is presented. The proposed antenna has a simple configuration to fabricate with low cost. The antenna is composed of two elliptical conducting plates connected to the two edges of a small horizontal rectangular plate and placed over a small circular ground plane. The designed antenna has a very wide bandwidth range of 3-18 GHz, low cross polarization, relatively high gain and good far-field radiation characteristics in the entire operating bandwidth. To obtain the broad bandwidth, the antenna dimensions have been optimized. A comprehensive parametric study has been carried out to understand the effects of various parameters and to optimize the performance of the final design. The designed antenna is simulated with software packages CST microwave studio and Ansoft' HFSS in the operating frequency range. Simulation results for VSWR and far-field radiation patterns of the antenna over the frequency band 3-18 GHz are presented and discussed.
V-SHAPED MONOPOLE ANTENNA FOR BROADBAND APPLICATIONS