This paper presents a novel advanced Bluetooth Low Energy (BLE) beacon, which is based on an array of frequency-steered leaky-wave antennas (LWAs), as transmitter for Direction-of-Departure (DoD) estimation system. The LWA completely passive, fabricated in low-cost FR4 printed-circuit board and designed to multiplex different angular directions space each one the three associated BLE advertising channels that are used periodically transmitting ID beacon. way, use more expensive hardware...

Different types of waveguide leaky-wave antennas, asymmetrically perturbed with printed-circuits, are studied in this paper. The capability to modify the leakage constant excited mode, while maintaining unchanged its phase constant, is detail for each design. Several slot and strip configurations proposed, which width position planar printed circuit perturbation modified along length antenna obtain different tapering topologies. All them mechanically flexible realize, thus simplifying...

The synthesis of frequency-scanned monopulse radiation patterns using an array two leaky-wave antennas (LWAs) is demonstrated. LWA must be designed with appropriate shifted frequency-dispersion responses to fulfill the desired monopulse-scanning specification over required bandwidth and number channels. This demonstrated manufactured LWAs in half-width microstrip technology, scan band from 2.39 2.65 GHz covering a field view (FoV) -80° +80° three frequency Also, this paper addresses...

A simple adaptive 1-D frequency-scanning method is proposed for radiative wireless power transfer (WPT) systems in low-power sensor networks (WSNs). As a proof of concept, directive leaky-wave antenna that scans 1-W output RF the angular range from ±10° at 2.4 GHz to ±37° 2.5 GHz, used WSN covering an area 1.2 m <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times1.2$ </tex-math></inline-formula> m. It...

A compact printed-circuit leaky-wave antenna is designed to synthesize frequency-scanned monopulse patterns in the UHF RFID band from 902 928 MHz. high-permittivity ceramic substrate used maximize angular scanning range such a narrow band. Two operating modes, i.e., narrow-field and wide-field can be chosen by properly selecting frequency channels ports. This allows adapt different fields of view while maximizing maximum reading distance, as demonstrated with fabricated prototype.

This work proposes a novel system for location applications of RFID tags in UHF band. The is based on frequency-scanning leaky-wave antenna (LWA), commodity hardware and Angle-of-Arrival (AoA) estimation the signal reflected from tags, by using only RSSI (Received Signal Strength Indicator) data. LWA completely passive, manufactured simple printed technology directly connected to reader. dispersive nature combined with selection proper high permittivity substrate allows radiation frequency...

A novel 2-D indoor location system for Internet of Things devices employing a single Wi-Fi access point (AP) is presented. The <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\{x, y\}$ </tex-math></inline-formula> position estimated with combination Direction-of-Arrival (DoA) and Time-of-Flight (ToF) algorithms. azimuthal DoA using modified MUSIC technique, which requires the acquisition received signal...

We investigate the use of a single leaky wave antenna (LWA) for amplitude-monopulse direction finding when compared to more conventional two tilted antennas. Thanks inherent bidirectional feeding and scanning behavior LWAs, it is demonstrated compact planar design while offering similar functionality in far field. The frequency beam squinting effect suffered by LWA, its capability create frequency-scanned monopulse patterns, are also analyzed; moreover, smaller size mitigates near-field...

We present a cost-effective hybrid analog digital system to estimate the Direction of Arrival (DoA) WiFi signals. The processing in domain is based on simple well-known RADAR amplitude monopulse antenna techniques. Then, using received signal strength indicator (RSSI) delivered by commercial MiMo cards, DoA estimated so-called function. Due architecture, extremely simple, so that estimation performed without IQ data from specific hardware. simplicity and robustness proposed architecture...

A simple analytical condition for the radiation resistance and conductance (R, G) of an equivalent composite right/ left-handed (CRLH) balanced leaky-wave antenna unit-cell is pro- posed to achieve a constant rate. Similar CRLH "balanced condition," which allows smooth phase transition from right-handed frequency regions, R-G provides continuous losses region. Moreover, this also solves fluctuations that traditionally occur around due real losses. Several numerical results are included...

The functionality of a metadome to provide fast frequency conical beam scanning using simple feeding is reported in this letter. A metasurface composed periodic patches covering monopole antenna acts as partially reflective sheet produce frequency-scanned beams. Then, the addition high-impedance surface ground plane used increase ratio. This important cover wide range narrow bandwidth. design example for direction finding with field view 60° and 200 MHz unlicensed band from 5.1 5.3 GHz,...

In this paper, a neural-network-based method for the analysis of practical multilayered shielded microwave circuits is presented. Using idea, radial basis function neural network (RBFNN) trained to approximate space-domain media boxed Green's functions used in integral-equation (IE) method. Once RBFNN has been trained, outputs (NN) replace exact functions, during numerical solution IE. The computation output values very fast comparison with methods calculate functions. This paper describes...

We study the effect of close-proximity in estimation Direction-of-Arrival (DoA) using a monopulse antenna array system, with application to angle-sensitive proximity WiFi readers. It is shown that this scenario, it necessary consider near-field radiative effects make an accurate angular at short distances between mobile terminal and DoA sensor. As result, we define range-dependent function, which provides better Field View 60° for ranging from 3 m 50 cm.

A novel low-cost high-gain beam-steering antenna terminal topology for global data connectivity with low-earth-orbit satellite constellations in the UHF 900 MHz ISM band is reported. It shown how a simple printed-circuit-board half-width microstrip leaky-wave (LWA) passive frequency-beam scanning capacity provides an energy-efficient method avoiding more power-demanding and expensive techniques (such as electronic scanning, mechanical rotation, or beam switching). For that, iridescent...

This contribution presents compact structures for the implementation of transmission zeros using zero shifting property. First, two open-loop resonators operating at different resonances are employed. Then, one is substituted by a (/spl lambda//4) short-circuited line, thus resulting into more structure. Properties these configurations discussed, and manufactured prototypes have been successfully tested. The results show usefulness validity new with high rejection capabilities.

A novel structure for the implementation of compact transversal bandpass filters is proposed in this paper. This new proposal consists a hybrid structure, based on combination two different technologies: waveguide and microstrip. It shown that microwave filter able to implement both second- third-order filtering function with up or three transmission zeros, respectively. In way, practical fully canonical third degree response first time directly achieved. addition, way control positions...

A novel technique to increase the pattern bandwidth of substrate-integrated waveguide leaky-wave antennas (SIW LWAs) is proposed. By coupling several SIWs, it shown that gain at desired angle can be kept stable across a wide-frequency band. systematic design methodology based on simple transverse equivalent network presented. Practical coupled-SIW designs with exceeding 10 dB and pointing 30° in 15-GHz band are reported validate theory. Simulation experimental results demonstrate an...

A novel leaky-wave antenna, based on a periodic set of slots printed rectangular dielectric waveguide is conceived in this work. The antenna presents the ability to independently control aperture illumination and pointing direction, by only modifying photoetched printed-circuit layout. working mechanism described using leaky-mode dispersion analysis, cosine-tapered designs are performed at 50 GHz. radiation patterns obtained HFSS analysis check reduction sidelobes levels, capacity tune...

The systematic design of broadband, directive, scanned planar leaky-wave antennas using coupled-cavity substrate integrated waveguide technology is reported in this work. methodology based on the optimization corresponding transverse resonance phase equation, so that a constant scanning angle condition satisfied for wide frequency band. This process validated with full-wave simulations 4th order-cavity optimized design. A 3dB pattern bandwidth 1.5GHz 10dBi directivity at central 15GHz (10%...

An original leaky-wave antenna (LWA), conceived from a microstrip line which is laterally shielded by parallel plates, presented in this paper.This structure shows, for the first time, that leakage rate of leaky-mode can be easily controlled while negligibly affecting pointing direction.The based on radiation second higher order mode line, perturbed addition two conductor walls to control level rate.The parallel-plates also serve as mechanism obtain single main beam azimuthal plane,...

An initiative carried out at the Technical University of Cartagena (UPCT, Spain) to encourage students and promote interest for Scientific Engineering Culture between society is presented in this contribution. For purpose, a long-term project based on set-up an interactive laboratory surrounding small Radio Telescope (SRT) system has been out. The main novelty that entirely being developed by last courses our Telecommunication Faculty, under supervision four lecturers. This lab offers...

Abstract This paper presents novel topologies for the design and realization of microwave filters combining dual‐mode single‐mode cavities in all‐inductive waveguide technology. Examples orders 3–5 with one or two transmission zeros are synthesized designed, order to demonstrate validity proposals. All coupling schemes explored exhibit zero‐shifting property, so can be easily placed above below passband. A four‐pole dual‐band‐pass filter is also designed show flexibility offered by...

Two different leaky-wave antenna topologies are proposed for 2D Direction-of-Arrival (DoA) estimation in the frame of Internet Things (IoT). The theoretical and simulated results obtained Bluetooth Low Energy (BLE) advertising channels frequencies (i.e. #37, #38 #39 at 2.402, 2.426 2.48 GHz, respectively). synthesized frequency-scanned beams presented two designs, one using four ports other only a single port. localization performances each topology also compared.