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A sensor is proposed and analyzed numerically for the characterization of the dielectric permittivity of substances in the microwave region. For this, an antenna is used based on a rectangular resonator ring, on a TMM® 13i substrate. This is a thermosetting dielectric polymer ceramic compound with a dissipation factor of 0.0019 at 10 GHz, which allows us to obtain a highly resonant device at the frequency of 2.4 GHz and 5 GHz. The ring resonator method is used with a Pyrex glass capillary in the center to interrogate the electrical characteristics of this sensor such as permittivity, permeability, and conductivity. The results obtained reveal that the proposed sensor presents a displacement sensitivity in the fundamental frequency, when it is used in the characterization of samples whose permittivity is within the range 1 to 80. In addition, it has a compact size, as it only measures 42 mm x 46 mm. In addition, some heavy metals that can be found in the environment were simulated. The results obtained allow us to show that the proposed sensor turns out to be an interesting alternative because its manufacture is simple and inexpensive. Furthermore, it can be easily integrated into wireless sensor networks, which are of wide interest at an industrial level since it can be easily integrated with emerging technologies such as the Internet of Things. [ABSTRACT FROM AUTHOR]

Wireless power transfer using near-field inductive coupling has been employed in several applications, including wireless charging of electronic devices and powering of implanted biomedical devices. In these applications, power is transferred over short distances, which are much smaller than the operating wavelength. In these systems, the link power transfer efficiency is inversely related to the operating range. This paper focuses on the design and investigation of a pair of equal-dimensional microstrip antennas, one of which is excited by a pulse emitted using GNU Radio software and USRP 2901. The proposed pair of devices consists of two monopoles with faulty ground the sizes, 16 mm × 116 mm, which act as transmitter and receiver respectively. The devices have been designed, simulated, and optimized using CST Microwave Studio software. The surface current results of the coupled devices indicate good current density over a distance range of 10 mm to 50 mm. [ABSTRACT FROM AUTHOR]

A new microstrip antenna system is presented in this work, in which are inserted rectangular slots and different orders in the cantor sequence determine their dimension and separation. The return losses are analyzed to determine the effect of this type of slot sequence on the patch, showing the generation of dual-band behavior in the range of 1 to 6 GHz. The microstrip antenna is designed by several slots on the patch whose sizes are based on the Cantor sequence up to the fourth iteration. The presented arrangement allows having two resonance frequencies in the range of 1 to 6 GHz, the experimental results and the computer simulations show a high concordance. The simulation was performed using the HFSS software, using an FR4 substrate with er = 4.4 and a thickness of 1.58 mm. The antennas presented in this article, unlike a conventional microstrip antenna with the same dimensions, present two bands of frequency, which have slight differences between each iteration. The new microstrip antenna systems presented in this work allowed to obtain a dual-band generation after adding slots based on the Cantor sequence. [ABSTRACT FROM AUTHOR]

The design and implementation of a microstrip antenna with an insertion in the feed line of a metamaterial structure, which from a hybrid perspective combines split ring resonators (SRR) and complementary split ring resonators (CSRR), for the band of 2.4 GHz is presented in this paper. The geometrical parameters of the structure are varied in order to evaluate the response of resonance frequency and the radiation pattern of the proposed antenna. The metamaterial structure adjacent to the power line produces a considerable increase in the bandwidth concerning to that of the conventional antenna, caused by the overlapping of the frequency bands produced by the radiant patch and the left-handed structure. The bandwidth of the antenna with metamaterial inclusion is increased to twice the expected in the original patch antenna, from 2.74% to values ranging from 4.55% to 6%, at expenses of gain degradation, but without significantly affecting the coupling, and maintaining a suitable directivity. Simulation and measured results are presented and show that the proposed metamaterial structure associated with the transmission line of microstrip antennas is a novel way of using SRR and CSRR, which allows suppressing the narrow bandwidth constraint. [ABSTRACT FROM AUTHOR]

In the present investigation, the obtaining of an antenna type collinear arrangement using the microstrip technique is described. To fulfill this objective, it was necessary to carry out a study on the antennas that are most frequently used in the 2,4 GHz ISM band; widely used to offer Wi-Fi service. The motivation of the research focuses on the little knowledge provided by the literature consulted on easy-to-reproduce antennas, light but at the same time robust, and that also have omnidirectional properties in the azimuth plane. Using the microstrip technique it was possible to achieve a prototype antenna that would meet such needs. The different stages of the design, simulation, construction and measurement process developed during the investigation are a sample of the results achieved were satisfactory, being guaranteed by obtaining the desired form of radiation and, according to the measurements made, of a high level of adaptation, demonstrated in a Stationary Wave Ratio (ROE) of less than 1,288 in the work band; while the impedance keeps its real part close to 50 Ohm and the imaginary close to zero. [ABSTRACT FROM AUTHOR]

In this paper is presented a study of the insertion of metamaterial structures in a rectangular patch antenna fed by microstrip line linear polarization to achieve increased bandwidth. The main characteristics of left-handed materials are analyzed and their behavior is investigated inside the antenna, which allows obtaining an increase bandwidth and improve some of the fundamental parameters in the design of rectangular patch antennas by applying the theory of themselves and simulation tools supported by computer-assisted. Initially a study of the influence that makes is performed, the cell structure composed by complementary ring resonators open square in shape with their respective "gaps" associated to the patch and position thereof on the parameters of interest microstrip antenna especially bandwidth. The results obtained allowed to conclusions that the location of metamaterial associated power line exerts a marked influence on the radiating structure; an increase in bandwidth and a decrease in efficiency over conventional microstrip antenna structures occur no left-handed. Besides confirm that the increased the dimensions of the complementary rings cause a decrease in the resonance frequency. Finally, the design of a microstrip antenna with left-handed structures for the 2.4 GHz ISM band is presented. [ABSTRACT FROM AUTHOR]

This paper proposes the study of an inverted microstrip plasma-based reconfigurable antenna. The scope is to generate controlled microplasma inside the cavity between the antenna ground plane and its main conductor. This plasma will modify the resonant frequency of the antenna. The interest of using a plasma discharge as an active reconfigurable element is its switching time and mainly its capability of handling high microwave power. It was demonstrated, theoretically, that the reconfiguration frequency of a microstrip patch antenna with a microdischarge in its cavity, depends on the electron density of the plasma. Furthermore, a prototype of an X-Band inverted microstrip patch antenna, which integrates a microdischarge, was implemented. The measured frequency excursion for this prototype was 180 MHz. [ABSTRACT FROM AUTHOR]

This paper presents the development of an antenna with circular polarization and double resonance using a substrate of low dielectric constant and low price, showing comparable results in front of conventional designs. The design is made up of two rectangular patches isolated by an air gap including two triangular cuts and two parasitic patches located in the opposite direction giving a certain degree of additional freedom which allows a suitable axial ratio and an acceptable coupling to the desired frequencies. The antenna was optimized by means of parametric analysis carried through diverse variables which belong to geometry. The implemented prototype allows the simultaneous operation of the antenna in the GPS (Global position systems) bands of 1,227 GHz (band L2) and 1,575 GHz (band L1). The antenna shows a measured impedance bandwidth of about 18,03MHz (fc1 = 1,227GHz) and 17,66MHz (fc2 = 1,575GHz), for VSWR ≤ 2:1 (Voltage Standing Wave Ratio), the simulated results for antenna gain were of 5,4dBi and 6,8dBi and axial ratio of 8,1MHz and 10,2MHz in the L1 and L2 bands respectively. The numeric simulations agree well with the measurements on the experimental prototype proving the antenna behaves according to what was expected. [ABSTRACT FROM AUTHOR]

In the last times, the improvement of the digital television has opened to the novel design of devices for the reception of the sign. The present work is focused in the obtaining of an antenna in printed technology in the band of 470-890 MHz for the television services. In the same one the main characteristics of the microstrip antennas are analyzed and of the logarithmic periodic (LPDA) as they are the entrance impedance, diverse configurations, feeding ways; analyzing the advantages and disadvantages that can bring the coalition of both for the design. Also intends a group of considerations for the design of the antenna, taking as main objectives to achieve a smaller size of the device, a low profile and a good yield for the wanted band of frequencies. The simulations of the design in the software Ansoft HFSS v12 is analyzed, corroborating the execution of the initial goals. [ABSTRACT FROM AUTHOR]

In this work it is presented a dual band proximity fedmicrostrip antenna. The device works on Wifibands2.4 (2.4-2.485 GHz) and 5.2 (5.15-5.35 GHz). Dual frequency operation has been realized by a slot patch. The new bandcan be adjustable in a wide range from 4.95 to 5.70 GHz, which allows getting frequency ratios f2/f1 from 2.06 to 2.38. [ABSTRACT FROM AUTHOR]

The article presents a study which applies the method of analysis for the design of rectangular microstrip antennas. The researchers analyzed patch antennas and obtained a computer program. It was found that the beneficial agreements were gathered through the comparison of results found from the literature and results from the measurements.