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Title: ACES Express Journal June 2018 Cover
File Type: Express Journal Paper
Issue:Volume: 33      Number: 6      Year: 2018
Download Link:Click here to download PDF     File Size: 2167 KB

Title: ACES Express Journal June 2018 Front/Back Matter
File Type: Express Journal Paper
Issue:Volume: 33      Number: 6      Year: 2018
Download Link:Click here to download PDF     File Size: 449 KB

Title: ACES Express Journal June 2018 Full
File Type: Express Journal Paper
Issue:Volume: 33      Number: 6      Year: 2018
Download Link:Click here to download PDF     File Size: 19932 KB

Title: Comparison of Three Body Models of Different Complexities in Modelling of Equal-Sized Dipole and Folded Dipole Wearable Passive UHF RFID Tags
Abstract: We compare the performance of equal-sized dipole and folded dipole wearable passive UHF RFID tags using three different body models for the torso of an adult male: cuboid and anatomical models with and without internal structures. The results show that all models estimate the antenna impedance matching appropriately, but only the anatomical models predict the full spatial coverage of the tags properly. We present a novel metrics for analysing the coverage in simulations and compare the simulated and measured tag read ranges to validate our modelling results.
Author(s): T. Bjorninen
File Type: Express Journal Paper
Issue:Volume: 33      Number: 6      Year: 2018
Download Link:Click here to download PDF     File Size: 2750 KB

Title: N-Shaped Frequency Reconfigurable Antenna with Auto Switching Unit
Abstract: These days the need for reconfigurable antenna is widely increased in the field of multi band wireless communication. The proposed new design of N-shaped antenna structure consists of two PIN diodes for switching purpose. They are switched automatically by a pre-programmed Arduino microcontroller unit to attain the reconfiguration of four-different bands without changing the physical dimension of the antenna. The four switching bands are 3.5 GHz (WiMAX), 2.46 GHz (WLAN), 1.2 GHz (GPS) and 2.1 GHz (UMTS). It has a center stub with two N-shaped stub carrying PIN diodes. The stubs are connected with a 50ohm microstrip feed line. The measured return loss closely follows the simulation results. Also it exhibits a good impedance matching during the four switching states. The simulation has been done through Ansoft HFSS and measured results are obtained from a Vector Network Analyzer (VNA). The obtained VSWR value lies beneath 2 for all obtained bands. The radiation pattern of the antenna is bidirectional for all the four-switching states.
Author(s): A. Vijayan, L. R. KarlMarx, K. J. Jegadish Kumar , C. C. Vimlitha
File Type: Express Journal Paper
Issue:Volume: 33      Number: 6      Year: 2018
Download Link:Click here to download PDF     File Size: 1798 KB

Title: Study of Phase and Patterns Characteristics of a Sub-Wavelength Broadband Reflectarray Unit Element Based on Triple Concentric Circular-Rings
Abstract: In this paper, phase and patterns characteristics of a sub-wavelength broadband reflectarray (RA) unit element are propounded. The unit element consists of triple concentric circular-rings on the Rogers 4003 substrate (H2) that provide a nearly 615 degree linear phase range. To obtain a phase curve with a lower slope, a 3 mm thick Foam (H1) is used and backed by a ground plane. A complete investigation analysis has been done to study the phase and patterns characteristics of the proposed sub-wavelength RA unit element. Results indicate that not only the incidence angle alter the element reflection phase, but also for oblique incidence, the element pattern deforms. It is shown, for sub-wavelength elements the combined effects of the mentioned factors are less severe.
Author(s): J. Nourinia, C. Ghobadi, B. Mohammadi, F. Alizadeh
File Type: Express Journal Paper
Issue:Volume: 33      Number: 6      Year: 2018
Download Link:Click here to download PDF     File Size: 2171 KB