Author
D. Gala
Bio: D. Gala is an academic researcher. The author has contributed to research in topics: Dipole antenna & Microstrip antenna. The author has an hindex of 2, co-authored 2 publications receiving 79 citations.
Papers
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06 Mar 2006
TL;DR: The present paper shows a conventional design for dual-band operation and how it can be improved for a quad-band design through the FracPlane technique, which encapsulates both basic shaping of a groundplane to a more sophisticated space-filling and/or multilevel design for further size reduction and multi-band performance enhancement.
Abstract: INTRODUCTION Mobile devices are in a constant state of evolution given the increasing features and frequencies available worldwide. Today, global handset functionality is becoming an important consideration influencing customer purchasing habits. Industry dynamics have increased the drive for smaller and multi-functional wireless devices. Antenna technology has played a key role in influencing the end form factor of these mobile devices because without the antenna the device is not wireless. The present paper shows a conventional design for dual-band operation (GSM900-DCS1800) and how it can be improved for a quad-band design (GSM850-GSM900-DCS1800-DCS1900) through the FracPlane technique. This technique encapsulates both basic shaping of a groundplane to a more sophisticated space-filling and/or multilevel design for further size reduction and multi-band performance enhancement [1,4].
62 citations
TL;DR: In this paper, a novel miniature antenna loaded with a space-filling shaped transmission line is presented, and the antenna presents an electrical area 18 times less than the square patch.
Abstract: A novel miniature antenna loaded with a space-filling shaped transmission line is presented. Return loss and antenna gain results are compared with a traditional square patch. Experimental results show that the antenna presents an electrical area 18 times less than the square patch. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 311–312, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11046
17 citations
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TL;DR: In this article, a multiband handset antenna combining a PIFA and multiple slots on a ground plane is presented, and it is shown by means of simulations that the slots on the ground plane have a double function: to tune ground plane resonance at low frequencies and to act as parasitic radiators at high frequencies.
Abstract: A multiband handset antenna combining a PIFA and multiple slots on a ground plane is presented. It is shown by means of simulations that the slots on the ground plane have a double function: to tune the ground plane resonance at low frequencies (f ? 900 MHz) and to act as parasitic radiators at high frequencies (f ? 1800 MHz). A prototype is designed and built featuring a behavior suitable for low frequencies (GSM850 and GSM900) and for high frequencies spanning from DCS1800 to Bluetooth, and including, for instance, PCS1900, UMTS2000, and other possible systems. Reflection coefficient, efficiency, and radiation patterns are measured and compared with a design without slots to prove the advantages of the slotted ground plane. The component effect is investigated to determine critical areas where the placement is not recommended. Besides, the effect of the slot of the ground plane on SAR is investigated, by discussing the effect of the ground plane and slot modes for two phone positions. The total antenna volume of the proposed design is 40 × 15 × 6 mm3.
225 citations
15 Apr 2005
TL;DR: The combination of fractal geometry with electromagnetic theory opens an interesting window for research to find new antenna designs and applications Fractal technology applications can be divided into six main groups: (1) multifrequency antenna elements, frequency-selective surfaces, and arrays; (2) electrically small antennas; (3) high-directivity radiating elements; (4) low-sidelobe arrays, (5) undersampled arrays; and (6) fast computational methods as discussed by the authors.
Abstract: The combination of fractal geometry with electromagnetic theory opens an interesting window for research to find new antenna designs and applications Fractal technology applications can be divided into six main groups: (1) multifrequency antenna elements, frequency-selective surfaces, and arrays; (2) electrically small antennas; (3) high-directivity radiating elements; (4) low-sidelobe arrays; (5) undersampled arrays; and (6) fast computational methods This article reviews most of the work done in the fractal technology field covering the last six fields
Keywords:
fractal;
antennas;
multifrequency;
arrays;
small antennas;
arrays;
microstrip antennas;
broadband;
high-directivity
151 citations
TL;DR: A description of the evolution of wireless handheld devices, regulations, challenges in today’s smartphones, and handset characterization is reviewed and recent advances in antenna technology for wireless handheld or portable devices are presented.
Abstract: The constant evolution of wireless handheld devices together with the apparition of multiple wireless communication systems fosters the antenna community to design new radiating and measurements systems capable of satisfying the market demands. It is an object of the present paper to provide an overview of the evolution that wireless handheld technology has experienced in the last years. In this sense, a description of the evolution of wireless handheld devices, regulations, challenges in today’s smartphones, and handset characterization is reviewed. Finally, recent advances in antenna technology for wireless handheld or portable devices are presented.
140 citations
TL;DR: In this paper, a PIFA-based handset antenna technique combining a parallel excitation of the PIFA and a slot is presented, where the number of frequency bands is given by the sum of bands given per each radiator which can be controlled independently.
Abstract: A handset antenna technique combining a parallel excitation of a PIFA and a slot is presented. The number of frequency bands is given by the sum of bands given per each radiator which can be controlled independently. Component interaction (battery, display, and speaker) is analyzed to determine the best place to mitigate performance degradation. Finally, a concept featuring a small footprint (39 × 11 mm2) and low profile (2 mm) is proposed for multiband operation.
137 citations
Patent•
15 Mar 2006
TL;DR: In this article, the ground plane is partially covered with an insulating material and the connecting means are given by a part of the ground planes which is not covered by any insulating materials.
Abstract: A wireless device includes a ground plane with at least two portions. On each of the at least two portions at least one connecting means is provided. The two connecting means are connected with an electric component for connecting the at least two portions of the ground plane. The ground plane is partially covered with an insulating material and the connecting means are given by a part of the ground plane which is not covered by any insulating material.
97 citations