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In this paper a rectangular patch antenna with two slots, integrated with a stacked parasitic antenna, is presented. These techniques allow a bandwidth (BW) and gain enhancement, two of the major limitations of traditional patch antennas. The antenna is designed to operate at 754 MHz for energy harvesting applications, from the Portuguese Digital Terrestrial Television (DTT) signal. The measured antenna...
With the tremendous growth and relevance of Internet of Things (IoT) is last years it became a demand to identify, communicate and transfer energy to all objects. These technologies are often desired to be hidden (or transparent) to the human eyes, not only by its aesthetic reasons but also by its reusability of the space which is often crucial. This reasons led to a significant grow in research of...
Inter-vehicular communications (IVC) is a hot topic of nowadays being an essential component for intelligent transportation system (ITS) architecture. According with vehicle type, different antennas are more appropriate than others. In this paper we focus on a proposal for Taxi's antenna integrated, making use of its characteristic bonnet without increment of an additional visible radiating element...
In this paper we propose for development and testing a low profile omnidirectional microstrip antenna. The antenna operating bandwidth covers 5–5.2 and 5.8–5.9 GHz bands being suitable for 5GHz ISM and UNII bands operation. The antenna is fabricated in FR4 due to low cost with overall dimensions of 77 × 10 × 1.6 mm3. The antenna is designed such that the currents on the top and bottom radiating elements...
A low-profile planar microstrip antenna array with elliptical elements is proposed, fabricated, and measured. The operating bandwidth of the antenna is about 1 GHz (5.3–6.4 GHz). The impedance matching, radiation pattern and polarization are analyzed numerically and compared to measurements. This antenna provides a two main directive radiation components (front and back), and circular polarization...
A pentagonal patch-excited sectorized antenna (SA) suitable for 2.4–2.5 GHz localization systems was studied and developed. The integration of six patch-excited structures converges into a sectorized antenna called Hive5 that provides gain improvement compared to a patch antenna, maximum variation of 3 dB beam width over the radiation pattern and circular polarization (CP). This antenna is presented...
This paper presents the impact of different antenna strategies for localization scenarios evaluation, based on ZigBee wireless sensor networks (WSN). On our first strategy the Received Signal Strength (RSS) is measured and evaluated using a chip antenna on the mobile unit, and a patch antenna on the WSN fixed nodes. Then, we present another strategy where all fixed nodes are exchanged by a new type...
Outdoor location/navigation systems are a useful support for our daily life. The majority of these systems are based on Global Navigation Satellite Systems (GNSS), which include for example, Global Positioning System (GPS) and Galileo. For indoor location systems several technologies have been presented, each of them with different characteristics. Like this, the choice of the location technology...
This paper presents a switched beam antenna suitable for localization systems operating on 2.4–2.5 GHz ISM band. The antenna is used in a system based on a wireless sensor network, and will be used for implementing Angle of Arrival (AoA) techniques combined with RF fingerprinting solutions. The proposed antenna, called Hive 5, is based on a sectorised design integrated with patch-excited horn antennas...
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