Current Issue : January - March Volume : 2017 Issue Number : 1 Articles : 6 Articles
This study introduces a new design of planar antenna array for ISM band applications\nat 2.4 GHz. This prototype is switched beam antenna, namely planar antenna\nwith four meandered slotted triangular elements (PAFMSTE), which is proposed for\nwireless indoor applications. The Base Station (BS) equipped with this planar antenna\nis preferred to be at the center position on the room ceiling to cover all sectors of\nthe room. It is designed to use four directional triangular elements arranged to form\na square planar antenna array. The PAFMSTE is used to obtain optimal directivity in\nfour directions in azimuth plane with 3 dB beamwidth of 90Ã?Å¡ at a specific orientation\nof 30Ã?Å¡ in elevation plane. Switched parasitic technique is used to enable PAFMSTE to\nsteer a directional beam through four locations by using four PIN diodes switches.\nThe High Frequency Structure Simulator (HFSS) is used as an efficient simulation\ntool to optimize the performance of the PAFMSTE antenna. The fabrication and\nmeasurements of the PAFMSTE antenna are introduced. The proposed antenna enable\nradio positioning via Angle of Arrival (AOA) information collected from nearby\ndevices. Then, the CramÃ?©r-Rao Bound (CRB) is presented for AOA estimation using\nidentically and equally spaced antenna elements. The CRB depends on the directivity,\nwhere the maximum values of CRB are 1.35 Ã?â?? 10âË?â??3 and 8 Ã?â?? 10âË?â??3 at HPBW of 60Ã?Å¡ and\n90Ã?Å¡, respectively....
A novel and miniature high-pass filter (HPF) based on a hybrid-coupled microstrip/nonuniform coplanar waveguide (CPW)\nresonator is proposed in this article, in which the designed CPW has exhibited a wideband dual-mode characteristic within the\ndesired high-pass frequency range.The implemented filter consists of the top microstrip coupled patches and the bottom modified\nnonuniformly short-circuited CPW resonator. Simulated results from the electromagnetic (EM) analysis software and measured\nresults from a vector network analyzer (VNA) show a good agreement. A designed and fabricated prototype filter having a 3\ndB cutoff frequency (...
An antenna array capable of focusing the power transmitted to a specified point in space is modeled and simulated. This array\nwill serve best for wireless power transmission applications where one of the goals is to maximize the power transfer efficiency. The\narray consists of 100 dipole antennas with each antenna transmitting a sum of 50 signals where each signal has a different frequency.\nThis difference in frequency gives an additional degree of freedom that allows the overall beam pattern to be focused to a point in\nspace instead of just a direction.The same array structure is also capable of transmitting power to multiple points in space which\nis promising when it comes to powering multiple points of interest....
This paper presents a design of UAVs-based 3D antenna arrays for a maximum performance in terms of directivity and side lobe\nlevel (SLL). This paper illustrates how to model the UAVs formation flight using 3D nonuniform antenna arrays. This design of\n3D antenna arrays considers the optimization of the positions of the antenna elements to model the UAVs formation flight. In this\ncase, a disk patch antenna is chosen to be used as element in each UAV.The disk patch antenna is formulated by the well-known\ncavitymodel.The synthesis process is carried out by the method of Differential Evolution forMultiobjective Optimization (DEMO).\nFurthermore, a comparison of the performance of 3D nonuniformantenna arrays is provided with respect to the most conventional\narrays (circular, planar, linear, and the cubic) for UAVs formation flight....
Array antennas offer a wide range of opportunities in the variation of their\ndirectivity patterns through amplitude and phase control. Directivity is one of very\nimportant parameters when optimizing Antenna. This paper intends to investigate\nthe effects of different geometries of array antenna on directivity and side lobe levels.\nA six by four antenna array was chosen for investigation with uniform element\nspacing between the elements and the results were presented for each selected\ngeometry, Array elements of dipole and patch antenna were chosen for the investigation\nand analysis. An analysis of the effect of the chosen antenna array was done\nby investigating its response when an incident emw (electromagnetic waves) from a\nmobile phone impinge on the array antenna where the tapering and beam-forming\ntechniques were used for analysis and results presented....
We designed a slit dipole antenna backed by an extended hemispherical silicon lens and investigated the minimum lens size in\nwhich the slit dipole antenna works as a leaky-wave antenna. The slit dipole antenna consists of a planar feeding structure, which\nis a center-fed and open-ended slot line. A slit dipole antenna backed by an extended hemispherical silicon lens is investigated\nover a frequency range from 0.2 to 0.4THz with the center frequency at 0.3THz. The numerical results show that the antenna gain\nresponses exhibited an increased level of sensitivity to the lens size and increased linearly with increasing lens radius. The lens with\nthe radius of 1.2...
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