Attenuation of multipath components using directional antennas and circular polarization for indoor wireless positioning systems

Szumny, R.; Kurek, K.; Modelski, J.

doi:10.1109/eurad.2007.4405022

Cited by 19 publications

(2 citation statements)

References 17 publications

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“…For that, the SR architecture offers the advantage of increasing the radiating elements 23 . The SR geometry can enhance the 3 dB AR bandwidth as well as the operational bandwidth for CP antenna arrays, as the reflections produced by mismatched components will cancel each other out at feeding input ports 24,25 . The SR technique can also be used with non‐identical elements to increase the bandwidth 26 .…”

Section: Topology Of the Arraymentioning

confidence: 99%

An eight‐element sequentially rotated crescent‐slot‐coupled dielectric resonator antenna array for WIFI applications

Qasaymeh

2023

Int J Communication

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In this communication, the author presents an eight-element sequentially rotated (SR) circularly polarized (CP) dielectric resonator antenna (DRA) for operation in the IEEE 802.11a standard. A novel resonating element composed of a crescent slot (CS) used to excite a rectangular dielectric resonator (RDR) is proposed that has two orthogonal modes TE y 1δ1 and TE x δ21 as required for CP radiation. An SR series-parallel geometry is used to prototype the array feed network to allocate the array elements to symmetrical positions. The phase progression of each element was 45 along the array, and the signal magnitude was distributed evenly based on the binomial theory to enhance the antenna performance. The prototyped SR array had a size of 46 Â 46 Â 0:813 mm 3 and was measured and characterized in order to authenticate the design. The resonance bandwidth (S 11 < À10 dB) was found to be 14.28% with a 3 dB axial ratio (AR) of 17.7% for right-hand CP. The gain varied from 15.71 to 16.26 dBi within the operating band. The size, gain, and impedance bandwidth of the proposed array make it a potential candidate for devices operating in the IEEE 802.11a band.

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Section: Topology Of the Arraymentioning

confidence: 99%

An eight‐element sequentially rotated crescent‐slot‐coupled dielectric resonator antenna array for WIFI applications

Qasaymeh

2023

Int J Communication

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“…The antennas operate in circular polarization, permitting a reliable link regardless of the relative orientation of the tag [19,25,26]. Furthermore, circular polarization is a strong aid in contrasting multipath impairment [27,28,29]. A set of patterns is projected over different spatial areas [19] and for each anchor tag data packet a complete RSSI vector for each antenna, called the steering vector, is given.…”

Section: Proposed Hardware Infrastructurementioning

confidence: 99%

An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks

Passafiume

Maddio

Cidronali

2017

Sensors

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Assuming a reliable and responsive spatial contextualization service is a must-have in IEEE 802.11 and 802.15.4 wireless networks, a suitable approach consists of the implementation of localization capabilities, as an additional application layer to the communication protocol stack. Considering the applicative scenario where satellite-based positioning applications are denied, such as indoor environments, and excluding data packet arrivals time measurements due to lack of time resolution, received signal strength indicator (RSSI) measurements, obtained according to IEEE 802.11 and 802.15.4 data access technologies, are the unique data sources suitable for indoor geo-referencing using COTS devices. In the existing literature, many RSSI based localization systems are introduced and experimentally validated, nevertheless they require periodic calibrations and significant information fusion from different sensors that dramatically decrease overall systems reliability and their effective availability. This motivates the work presented in this paper, which introduces an approach for an RSSI-based calibration-free and real-time indoor localization. While switched-beam array-based hardware (compliant with IEEE 802.15.4 router functionality) has already been presented by the author, the focus of this paper is the creation of an algorithmic layer for use with the pre-existing hardware capable to enable full localization and data contextualization over a standard 802.15.4 wireless sensor network using only RSSI information without the need of lengthy offline calibration phase. System validation reports the localization results in a typical indoor site, where the system has shown high accuracy, leading to a sub-metrical overall mean error and an almost 100% site coverage within 1 m localization error.

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Smart antenna with circular polarization for high accuracy indoor localization system

Bui

Nguyen

et al. 2021

Journal of Electromagnetic Waves and Applications

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Attenuation of multipath components using directional antennas and circular polarization for indoor wireless positioning systems

Cited by 19 publications

References 17 publications

An eight‐element sequentially rotated crescent‐slot‐coupled dielectric resonator antenna array for WIFI applications

An eight‐element sequentially rotated crescent‐slot‐coupled dielectric resonator antenna array for WIFI applications

An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks

Smart antenna with circular polarization for high accuracy indoor localization system

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