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Title: ACES Journal March 2014 Cover
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
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Title: ACES Journal March 2014 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 121 KB

Title: ACES Journal March 2014 Full
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 7667 KB

Title: Efficient Z-Transform Implementation of the D-B CFS-PML for Truncating Multi-Term Dispersive FDTD Domains
Abstract: Efficient Z-transform implementation of the Complex Frequency-Shifted Perfectly Matched Layer (CFS-PML) using the D-B formulations are proposed to truncate open region multi-term dispersive Finite-Difference Time-Domain (FDTD) lattices. These formulations are independent of material properties of the FDTD domains and hence can be used for modeling general media because of the D-B constitutive relations. A Three-Dimensional (3-D) simulation of the two-term Lorentz dispersive FDTD domain has been carried out to demonstrate the validity of the proposed formulations. Furthermore, in order to show the validity of the proposed algorithm, the second 3D inhomogeneous problem has also been used for validating the proposed formulations. It is clearly shown that the new formulations with the CFS-PML scheme are efficient in attenuating evanescent waves and reducing late-time reflections.
Author(s): N. Feng, Y. Yue, C. Zhu, Q. H. Liu, L. Wan
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 255 KB

Title: Multi-Band Metamaterial Absorber: Design, Experiment and Physical Interpretation
Abstract: This paper presents the design, fabrication, characterization and experimental verification of a perfect Multi-Band Metamaterial (MTM) absorber (MA) based on a simple configuration of a rectangular resonator and strips operating in microwave frequency regime. The proposed multi-band MA provides perfect absorption with TE-incident angle independency. Maximum absorption rate is achieved as 99.43% at 5.19 GHz for simulation and 98.67% at 5.19 GHz for experiment, respectively. The measurement results of the fabricated prototype are in a good agreement with the numerical results. Furthermore, we introduce a numerical analysis in order to show physical interpretation of the MA mechanism in detail. Additionally, a sensor application of the proposed multi-band MA is presented to demonstrate an extra feature of the suggested structure. As a result, the proposed multi-band MA enables myriad potential application areas such as radar, stealth, shielding, communication, imaging and medical applications.
Author(s): F. Dincer, M. Karaaslan, E. Unal, O. Akgol, C. Sabah
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 909 KB

Title: Microstrip-Fed Monopole Antenna with Triple Band Performance for WLAN/WiMAX Applications
Abstract: In this paper, a printed monopole antenna is presented for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The desired resonant frequencies are obtained by cutting four L-shaped slits in both sides of square radiating patch and an H-shaped slot around the slits. Prototypes of the proposed antenna have been constructed and studied. The measured impedance bandwidth for l0 dB return loss is from 2.23 GHz to 2.60 GHz (15.0 %), 3.05 GHz to 4.10 GHz (29.3 %) and 5.02 GHz to 5.86 GHz (15.2 %), covering the 2.4/3.5/5.5 GHz for WLAN/WiMAX applications. Simulated and experimental results obtained for this antenna show that the proposed antenna has a good radiation behavior within the 2.4/3.5/5.5 GHz frequencies.
Author(s): N. Ojaroudi, M. Mehranpour, S. Ojaroudi, Y. Ojaroudi
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 503 KB

Title: A Truncated Waveguide Fed by a Microstrip as a Multi-Band WLAN Antenna
Abstract: This paper presents a small truncated waveguide fed by a microstrip line through a transverse coupling slot for multi-band WLAN applications. The analysis of the presented antenna has been performed by replacing the feeding microstrip line with its equivalent Magnetic-Wall Waveguide (MWW) model and using an in-house Method of Moments (MoM) to analyze the structure. The use of entire-domain basis functions both on the slot and on the truncated waveguide apertures allows to obtain a very efficient analysis by exploiting the waveguide modes orthogonality. The proposed radiating element allows to obtain a high radiated power, with a very low cross-polar component in the radiated field, with a -10 dB bandwidth that covers the required frequencies for multi-band WLAN applications (5.2/5.4/5.8 GHz)
Author(s): G. A. Casula, G. Montisci, A. Fanti, P. Maxia, G. Mazzarella
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 784 KB

Title: A Novel Design of Reconfigurable Active Integrated Oscillator Feedback Antenna with Electronically Controllable for WiMAX/WLAN Applications
Abstract: A novel reconfigurable active oscillator feedback antenna for WiMAX/WLAN applications is presented. By using a rectangular ring with a pair of protruded -shaped strips in the active feedback antenna, two new resonances can be achieved. Also, the proposed rectangular ring with a pair of protruded -shaped strips radiating patch has a major advantage in providing tighter capacitive coupling to the line, in comparison to the known radiating patch. In order to generate DC isolation in the RF path we use a pair of gap distances in the microstrip loop. Also, by using the [S] parameters of the active element a novel design of the microwave oscillator is performed. Simulated and experimental results obtained for this antenna show that the proposed Active Integrated Antenna (AIA) has a good return loss and radiation behavior within the WiMAX/WLAN frequency range.
Author(s): J. Mazloum, A. Jalali
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 820 KB

Title: Compact Wide Band Printed Filter with Improved Out-of-Band Performance
Abstract: This paper presents a new configuration of a compact wide-band Bandpass Filter (BPF). The filter is realized using embedded stub configuration along with Defected Ground Structure (DGS) and folded stubs. The proposed configuration not only offers a compact structure but also shows a wide passband and improved out-of-band performance. A prototype model is developed and its characteristics are measured. Good agreement is obtained between simulation and measured results. The results show improved wideband behavior, insertion loss lower than 0.6 dB and 49.16 % of size reduction.
Author(s): A. K. Tiwary, N. Gupta
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 429 KB

Title: UWB Microstrip-Fed Slot Antenna with Band-Rejection Performance Using an SRR Conductor-Backed Plane
Abstract: In this article, a novel and compact ultra-wideband (UWB) slot antenna with bandnotched function is presented. This antenna consist of a square radiating stub, a 50? microstrip feedline, a ground plane with a pair of rotated Tshaped strips protruded inside square slots and a Split Ring Resonator (SRR) conductor-backed plane. In this design, by cutting a pair of modified square slots with rotated T-shaped strips protruded inside slots, additional resonance is excited and hence much wider impedance bandwidth can be produced. In order to achieve a band-notched function, an SRR parasitic structure was inserted in the ground plane. The measured results show that the proposed antenna can achieve the Voltage Standing Wave Ratio (VSWR) requirement of less than 2.0 in frequency range from 3.1 GHz to 13.15 GHz, with band-rejection performance of 5.08 GHz to 6 GHz, to avoid interference from WLAN communications. The presented microstrip-fed slot antenna exhibits good radiation behavior. The antenna has a small size.
Author(s): N. Ojaroudi, N. Ghadimi, Y. Ojaroudi
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 691 KB

Title: A Novel UWB Antenna with Triple Band-Notched Characteristics
Abstract: A novel planar monopole antenna with 3.9/5.5/8 GHz triple band-notched characteristics is proposed. The monopole antenna is composed of microstrip line and radiating patch where the large circle following connects with a small half circle, whereas the ground plane is printed on the other side. By adding a simple T-shaped resonator on the bottom side, two band-notched characteristics in the C-band (3.7-4.2 GHz) and Xband (7.6-8.6 GHz) are obtained at the same time. The band-notched characteristic in the WLAN (5- 6 GHz) is obtained by etching spline curved strip in the radiating patch. The measured results are roughly consistent with the simulated. The proposed antenna is printed on a 22 mm ! 32 mm, polytetrafluoroethylene (PTFE) substrate with relative permittivity of 2.65 and substrate thickness of 0.5 mm.
Author(s): X.-L. Yang, Y. Wang, G. Chen
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 1628 KB

Title: Design of Compact CPW-Fed Planar Antenna with Dual Notched Bands Using Slotted Conductor-Backed Plane for UWB Application
Abstract: A compact design of a Coplanar Waveguide Fed (CPW-Fed) monopole antenna with Ultra Wideband (UWB) performance and dual band-notched characteristics is proposed. Dual band-notched characteristics are achieved by U-shaped slot inside the slotted conductor-backed plane and a pair of mirror rectangular-shaped slots at the two sides of the truncated conductor-backed plane. Also, wider impedance bandwidth can be achieved with this structure. The proposed antenna has a small size of 1818 mm2 and measured to cover the bandwidth for UWB (2.7-14.5 GHz) for VSWR < 2, except the bandwidths of 3.1-3.6 for WiMAX and 5-6 GHz for WLAN. The antenna has an omnidirectional radiation across the whole ultra wideband as validated by the measured radiation pattern and gain.
Author(s): M. Moosazadeh, Z. Esmati
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 757 KB

Title: Planar Ultra-Wideband (UWB) Antenna with C-Band Rejection Using Self-Complementary Structures
Abstract: In this paper, we describe an application of the Self-Complementary Structures (SCS) to design a low-profile UWB monopole antenna with band-notched function. The proposed antenna consists of a square radiating patch with a rotated Z-shaped slot, a ground plane with a rectangular slot and rotated Z-shaped parasitic structure inside slot; which provides a wide usable fractional bandwidth of more than 125% (2.81- 12.63 GHz), with band-notched function around 3.7-4.2 GHz, to avoid interference from C-band communications. In the presented antenna, by using a rotated Z-shaped parasitic structure inside the rectangular slot in the ground plane, additional resonances are excited and hence much wider impedance bandwidth can be produced; especially at the higher band. To generate a band-stop characteristic, we use the self-complementary structure of the configuration that was inserted in the ground plane, which is a rotated Z-shaped slot at square radiating patch; with this design we can give a C-band rejection performance. The designed antenna has a small dimension of 12180.8 mm3 .
Author(s): N. Ojaroudi, N. Ghadimi, Y. Ojaroudi
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
Download Link:Click here to download PDF     File Size: 1467 KB