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Title: ACES Journal March 2015 Cover
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
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Title: ACES Journal March 2015 Front/Back Matter
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 101 KB

Title: ACES Journal March 2015 Full
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 10330 KB

Title: Observed Accuracy of Point-Tested and Galerkin Implementations of the Volume EFIE for Dielectric Targets
Abstract: Galerkin testing in method-of-moments procedures is defined as the use of the same set of functions as both basis functions and testing functions to construct a linear system from a continuous equation. There is a widespread belief that Galerkin testing enhances the accuracy of numerical results, and this has been shown to be true under certain conditions for surface integral equation formulations. This property is investigated for the volume electric field integral equation (EFIE) applied to dielectric bodies. The relative accuracy obtained in internal fields and scattering cross section for Galerkin and for point testing schemes is compared for a variety of target sizes and materials. In many cases, the point-tested results converge at the same rate as the Galerkin results and are more accurate.
Author(s): A. F. Peterson
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 309 KB

Title: Near-Field Wireless Transfer to Embedded Smart Sensor Antennas in Concrete
Abstract: Wireless power transfer to embedded smart sensor antennas using near-field coupled loop antennas is experimentally studied. Multi-turn loop antennas designed for operation at around 10 MHz show that they can attain fairly high efficiency when properly matched and operated in close proximity to each other whether in free-space or within dry concrete. When one loop is embedded inside 2, 4, and 6 cm of concrete while the other resides over it, it is shown that the embedded loop can receive about 1.9, 1.6, and 1.3 watts of power respectively when the transmit power is 5 watts. Thus, even with an external transmitter with only 1 watt of power (30 dBm) will allow the received power to be 380 mw, 360 mw, and 260 mw for 2, 4, and 6 cm of concrete respectively. It is expected that the use of an even larger loop, magnetic material loading, and or the use of a flux concentrator will increase the efficiency further.
Author(s): X. Jin, J. M. Caicedo, M. Ali
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 1429 KB

Title: New Technique to Design Fresnel Zone Plate Antennas
Abstract: A new method to design Fresnel Zone Plate Antennas (FZPA) is presented in this paper. The proposed method is based on deforming a flat metallic surface in order to achieve the desired phase distribution required to point the main beam to a certain direction. The resulting shaped reflector is modeled by using parametric surfaces, since they allow fitting the real shape of the antenna accurately providing smooth variations. Therefore, the diffraction effect that appears in the transition region between Fresnel zones can be reduced. Unlike bulky parabolic reflectors, FZPAs are much smaller and easy to transport and support, being a promising candidate for satellite communication applications due to its high gain, high polarization purity and minimum volume.
Author(s): J. Gomez, A. Tayebi, F. Catedra
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 463 KB

Title: A New Compact Rectangle-Like Slot Antenna with WiMAX and WLAN Rejection
Abstract: In this manuscript, a new CPW-fed slot antenna with two band-notches for ultra-wideband communication systems is proposed. The antenna contains a trapezoid-shaped patch and a slotted ground plane. To achieve two notched bands, both of the inverted L-shaped strip and triangle-shaped element connecting to patch by via are used. The designed antenna is printed on an FR4 substrate with compact size of 2027 mm2 . Moreover, the antenna has been successfully fabricated and measured, indicating extended impedance bandwidth (3-11.2 GHz, VSWR?2) and dual bandnotched (3.2-3.9 GHz and 5-5.9 GHz) respectively
Author(s): M. Akbari, M. Khodaee, S. Zarbakhsh, A. Sebak
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 660 KB

Title: Oblique Incidence Plane Wave Scattering from Large Finite Arrays Using EV-AEF Method
Abstract: An efficient method for calculating scattering patterns of large finite arrays illuminated by an obliquely incident plane wave is presented in this paper. Based on the element-varying active element factor (AEF) technique, this method takes the element mutual coupling and edge effects into account, and it results in accurate solutions. From the periodicity and distribution properties of induced currents, various elements are combined according to a certain rule. The determination of element combination is related to the plane wave incident angle. Thus, the scattering pattern of a large finite array can be calculated with superposition of combined-elements in a relatively small array. Numerical examples of onedimensional (1-D) and two-dimensional (2-D) arrays verify the accuracy and efficiency of the proposed method.
Author(s): W. Shao, J.-L. Li, Q. Li
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 861 KB

Title: Dual-Band Active Integrated Antenna with Electronically Controllable for S-Band Applications
Abstract: A novel reconfigurable active feedback antenna for WiMAX/WLAN applications is presented. By using an H-shaped radiating patch with a pair of C-shaped slots in the active feedback antenna, two new resonances can be achieved. Also, the proposed radiating patch has a major advantage in providing tighter capacitive coupling to the line in comparison to 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. Jamali, M. Ahmadi, J. Mazloum, M. Ojaroudi
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 800 KB

Title: A Novel Multi-Band Polarization Insensitive Frequency Selective Surface Based on Centrosymmetric L-Shaped Metal Strips
Abstract: In this paper, a novel frequency selective surface (FSS) based on rotationally symmetric bended microstrips is investigated. The unit element consists of twelve L-shaped metal strips and a dielectric substrate. Bended L-shaped strips have different equivalent electric lengths corresponding to different resonant frequencies, which result in multi-band frequency characteristic. Meanwhile, the symmetric metal strips make the FSS polarization insensitive. The numerical experiments demonstrate that the FSS structure has fifteen stop-bands in the frequency band from 6 GHz to 20 GHz, and a good polarization stability as well. Moreover, the FSS design such as the inner radius of L-shaped metal strips, the dimensions of dielectric substrate and the width of the bended metal strips significantly effects on the FSS performance. Because of the multi-band property, the FSS designed in this paper has a bright prospect in many modern wireless communication systems and even in 5G communication system in the future.
Author(s): Y. Lin, X. Xu, Z. Dou, X. Liu, G. Yang
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 1664 KB

Title: Band-Stop Antenna with Enhanced Bandwidth by Using Several Pairs of Inverted L-Shaped Sleeves on the Ground for Wireless Applications
Abstract: A very wideband rectangular monopole antenna with band notched performance for wireless applications is proposed. The very wideband performance is obtained by introducing a new technique on the ground plane including several pairs of inverted L-shaped sleeves which provide a very wide bandwidth. By utilizing two radiating stubs in which an inverted ?-shaped strip is protruded, band-notched characteristics can be obtained. The measured results exhibit that the antenna is able to covers the bandwidth from 2.5 to 17.5 GHz, excluding the rejected bands from 3.1 to 4 GHz and from 5 to 6 GHz.
Author(s): M. Akbari, S. Zarbakhsh, N. Rojhani, A. Sebak
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 883 KB

Title: Miniaturized LTCC Bandpass Filter with Harmonic Supression
Abstract: This paper presents a harmonicsuppressed bandpass filter using a 3-dimensional (3-D) half-wavelength transmission line resonator, which is fabricated using low temperature co-fired ceramic (LTCC) technology. Owing to the distributed-element method in this 3-D design, the spurlines can be easily etched on the coupled feed lines to generate an extra transmission zero in the stopband without enlarging the circuit size. As a result, the second harmonic can be rejected to a great extent. For demonstration, a pair of two-order LTCC bandpass filters centered at 2.45 GHz with/without spurlines are designed using the compact 3-D resonator, and the size of the circuits is only 4.44.21.6 mm3 .
Author(s): C. Shao, H. Tang, R. Mao, J.-X. Chen, J. Shi, Z.-H. Bao
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 741 KB

Title: Distributed Diode Single-Balanced Mixer Using Defected and Protruded Structures for Doppler Radar Applications
Abstract: In this paper, a single-balanced diode mixer using defected and protruded structures for wireless application is presented. The operating frequency is selected for WLAN applications. The RF frequency is 2.412-2.484 GHz and the Local Oscillator (LO) is 2.132-2.204 GHz for 269 MHz Intermediate Frequency (IF) output signal. A Branch-Line Coupler is designed for the singlebalanced of mixer. Four protruded T-shaped strip are used to obtain good convention gain and suppress unwanted harmonics. Also by using Defected Ground Structure (DGS) with folded Tshaped arms in the filter, a harmonic rejection property is generated. The measured performances of fabricated circuit conventionalize to the simulated results and LO to RF isolation is lower than -20 dB, LO to IF isolation is lower than -28 dB and Radio Frequency (RF) to IF is lower than -37 dB.
Author(s): H. Ebrahimian, M. Ojaroudi, N. Ojaroudi, N. Ghadimi
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 747 KB

Title: Dual-Band Compact Array of Printed Dipole Antennas
Abstract: Compact array of printed dipole antennas loaded with reactive elements is proposed. A novel and practical applications of the metamaterial (MTM) inclusion in dipole antenna designs is presented. The simulation results show a reasonable reduction in mutual coupling between antenna elements and provide a possible way to reduce the element separation. A prototype of the proposed array antenna is fabricated and tested. Measurement shows that the isolation with interantenna spacing of less than 0.075? (at f=0.9 GHz) through the first frequency band (811 MHz955 MHz) is above 12.5 dB, while the proposed design provides more than 15 dB isolation with interantenna spacing of less than 0.133? at f=1.6 GHz (1325 MHz1880 MHz).
Author(s): M. Rafaei-Booket, A. Jafargholi
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 449 KB

Title: Circularly Polarized Square Slot Antenna Using Crooked T-Shape Technique
Abstract: This paper presents the investigation results on a novel circularly polarized square slot antenna (CPSSA) designed to operate at a frequency of 5.5 GHz. In order to realize the proposed antenna, miniature circular polarized square slot antenna is used with L-shape and crooked T-shape grounded strips located at the slots opposite corners to reduce cross-polarization. The antenna is fed by coplanar waveguide. The 3 dB axial-ratio of the CPSSA extends to approximately 2 GHz. The CPSSA was designed to operate over the frequency range between 3 and 11.1 GHz corresponding to an impedance bandwidth of 115% for VSWR<2. Acceptable agreement between the simulation and measured results validates the proposed design.
Author(s): S. Karamzadeh, V. Rafii, M. Kartal, M. Dibayi
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 583 KB

Title: Small Low Power Rectenna for Wireless Local Area Network (WLAN) Applications
Abstract: In this paper, a novel design of small low power rectenna operating on WLAN band with high harmonic rejection is presented. By using rotated E-shaped strip in the radiating patch, a new resonance at lower frequency (2.4 GHz) can be achieved. Also, by cutting a rectangular slot with protruded interdigital strip inside the slot in the feed line, a frequency band-stop performance can be achieved. The proposed structure has a major advantage in high harmonic rejection. The rectenna with integrated monopole antenna can eliminate the need for a Low Pass Filter (LPF) placed between the antenna and the diode as well as produce higher output power, with maximum conversion efficiency of 74% using a 1 K  resistor at a power density of 0.3 mW/cm.
Author(s): S. Jahanbakhsh, M. Ojaroudi, S. Kazemi
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 527 KB

Title: A Compact Frequency Reconfigurable Split Ring Monopole Antenna for WLAN/WAVE Applications
Abstract: A novel frequency reconfigurable dual band monopole antenna based on the triangular split ring element is proposed for wireless communications. The antenna with an overall compact size of 25251.6 mm3 is designed for the operating frequencies of wireless local area network (WLAN) 2.4/5.0 GHz standard and wireless access for vehicular environments (WAVE) 5.90 GHz standard. The parametric study is carried out for tuning the upper resonant frequency. The reconfigurability between the WLAN and WAVE frequency bands is achieved by using a pair of PIN diode. The design considerations for the proposed antenna are described and the experimental results are validated. The antenna exhibits almost uniform radiation characteristics and good gain at each frequency band with the -10 dB impedance bandwidth of 44.1%, 5.8% and 10.1% at 2.45/5.30/5.90 GHz WLAN and WAVE bands respectively.
Author(s): V. Rajeshkumar, S. Raghavan
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 598 KB

Title: Design of a Novel Ultra-Wideband Semicircular Printed Antenna with Dual-Band Notched Characteristic
Abstract: A compact semicircular printed antenna with dual-band notched characteristic is proposed. A narrow rectangular slot is etched on the radiation patch to prevail notch band at 5.13-5.87 GHz for WLAN. By using two circular slots (C-shaped) defected ground structure, another notch band, at 7.59-9.03 GHz for some C-band satellite communication systems, is achieved. Due to the shape of the proposed antenna, the total dimension of this structure occupies very small space. The antenna is successfully simulated and measured. A simple 50-? microstrip line is used to excite the slot. The parameters and dimensions of the antenna have been investigated by using HFSS. Results demonstrate that the suggested antenna with small size of 20201 mm3 has desired bandwidth range from 2.6-13.3 GHz for VSWR?2, except two notch bands.
Author(s): M. Najafpur, J. Nourinia, F. A. Jazi
File Type: Journal Paper
Issue:Volume: 30      Number: 3      Year: 2015
Download Link:Click here to download PDF     File Size: 586 KB