A Dual-Band Omnidirectional Circular Polarized Antenna Using Composite Right/Left-Handed Transmission Line With Rectangular Slits for Unmanned Aerial Vehicle Applications

Li, Zheyu; Zhu, Yongzhong; Yang, Hengliang; Guohao, Peng; Liu, Xiaoyu

doi:10.1109/access.2020.2999369

Cited by 14 publications

(23 citation statements)

References 21 publications

(19 reference statements)

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“…It is found that the architecture of the EZR-MZR resonators array is some kind like the alford loop. 17,18,[22][23][24] The alford loops are utilized to excited CP mode in a dielectric resonator, 22 and to radiate horizontal field omni-directionally. 23,24 It must be pointed out that the operating mechanisms of our proposed antenna is different from the alford loop.…”

Section: Discussion On the Operating Mechanismmentioning

confidence: 99%

“…A side view of the resonator is presented at the upper half of the Figure 1B. It is found that the architecture of the EZR‐MZR resonators array is some kind like the alford loop 17,18,22‐24 . The alford loops are utilized to excited CP mode in a dielectric resonator, 22 and to radiate horizontal field omni‐directionally 23,24 .…”

Section: Impedance Bandwidth Enhancement For Ezr‐mzr Based Antennamentioning

confidence: 99%

“…The antenna with alford loop and ZOR structure has a 6% bandwidth and volume of 0.4 λ × 0.4 λ × 0.08 λ 17 . In Reference 18, two layers of alford loops with slots and pins were designed to generate two CP bands, while the lower and upper bandwidths are 1.25% and 6.9%, respectively. Previously, a novel ZOR that hybridized the epsilon‐zero resonance and mu‐zero resonance (the EZR‐MZR resonator) was proposed, 19,20 which radiates horizontal and vertical polarizations with inherently 90° PD in one mode (ZOR) 19,21 .…”

Section: Introductionmentioning

confidence: 99%

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Bandwidth enhancement of the omni‐directional and circularly‐polarized EZR‐MZR antenna

Peng

Wang

et al. 2021

Int J RF Mic Comp-Aid Eng

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As electric and magnetic dipoles with inherent 90 phase difference (PD) can be easily realized by forming a circular array of the epsilon-zero resonance and mu-zero resonance (EZR-MZR) resonators, high design efficiency can be expected for lowprofile, omni-directional and circularly polarized (CP) antenna designing. However, high Q factor of the EZR-MZR resonator makes narrow bandwidth. This research is dedicated to enhance the bandwidth. Low Q factor and multi-resonances techniques are utilized to enhance the impedance bandwidth. While polarization compensation technique is applied to improve the axial ratio (AR) bandwidth by tuning the amplitudes and PD of the orthogonal vectors. The proposed antenna obtains a À 10 dB impedance band of 1.370 to 1.690 GHz (20.91% at 1.530 GHz) and a 3 dB axial ratio (AR) band of 1.260 to 1.580 GHz (22.53% at 1.42 GHz). The diameter and profile of the proposed antenna are 0.402 λ and 0.082 λ, respectively.

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Section: Discussion On the Operating Mechanismmentioning

confidence: 99%

Section: Impedance Bandwidth Enhancement For Ezr‐mzr Based Antennamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bandwidth enhancement of the omni‐directional and circularly‐polarized EZR‐MZR antenna

Peng

Wang

et al. 2021

Int J RF Mic Comp-Aid Eng

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“…An alternative method in analyzing the circular polarization behavior of this structure is explained as follows, which is based on the comparison of the E-field and surface current at each moment valid for omni-directional antennas, as described in [38].The E-field on the radiating plane mainly contributes to the vertically-polarized waves at the end-fire direction of the antenna. Similarly, the current surface on the radiating plane introduces the horizontally-polarized waves at the horizontal xy-plane of the antenna.…”

Section: Circular Polarizationmentioning

confidence: 99%

Electrically Small Spiral PIFA for Deep Implantable Devices

et al. 2020

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In this paper, a miniaturized implantable circularly polarized spiral Planar Inverted-F Antenna (SPIFA) in the UHF (600-800 MHz) band is presented. This antenna is intended for deep implantable devices such as leadless pacemakers and deep brain stimulation (DBS), which facilitates the reception of RF power from an external transmitter. The antenna is electrically small, with a volume of π× 5 mm × 5 mm × 3.2 mm and a diameter of 0.022λ. The performance of the proposed antenna in terms of reflection coefficient, realized gain and axial ratio are assessed when accounting for the effects of operating in different types of human body tissues, different biocompatible materials and different thicknesses and depths of the implanted antenna. Finally, the antenna is prototyped and measured in free space, a phantom model, in a cow's fat and muscle tissues to validate the simulation results, indicating good agreements. A realized gain around -20 dBm is achieved when operating in 50 mm depth in cow's muscle tissue while having electrically very small dimensions compared to implantable antennas reported in the literature.

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“…Thus, in an increasingly technological and volatile world, the need to update organizational paradigms becomes evident [20]. Reacting and adapting instantly to the population's behavioral changes is essential for providing quality public service [17].…”

Section: Introductionmentioning

confidence: 99%

Intelligent Technology to Enhance Policing and Public Accountability

Aloísio¹,

Ce²

2021

AIS

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In view of the situation of violence faced in Brazil, several actors, from the most diverse areas of knowledge, have been dedicated to studying, analyzing and proposing solutions for public security. The great challenge of much of what is produced is to combine theory with practice. In addition, the fact that we do not have State policies, but Government policies contribute significantly to the lack of long-term studies. Discontinuities, whether due to the ineffectiveness of what is proposed, or due to cultural and organizational changes in crime, preclude a cycle of planning, execution, evaluation and correction. This brings us to the first observation of modern public security: volatility. Thus, it is impossible to imagine modern management without the use of technology for the quick and assertive analysis of the problems faced. In this sense, the use of the intelligence, strategy, and technology triad becomes essential for accurate monitoring of these changes, providing guidelines and subsidies for the modernization of public security management and security and policing matrix. Given these statements, the present study has the general objective of presenting the Policy to Combat the Mobility of Crime and its effects on the Public Security of the State of Cear[Pleaseinsert“PrerenderUnicode–˝intopreamble] (Brazil), referring to the period from 2017 to 2019. Through an empirical analysis, statistical data were collected to present a direct scenario of the implementation and the results achieved and present the theoretical relationship between the actions and the results, thus providing an exploratory depth of the facts and their impacts. In order to show the positive results achieved, a quantitative and qualitative method was used to correlate aspects and concepts in the large area of the humanities with practical policing and technological applications. As a result of the implementation of the Combating the Mobility of Crime, the State of Cear[Pleaseinsert“PrerenderUnicode–˝intopreamble] managed to place the number of robberies and homicides among the lowest rates of the decade, gaining national prominence of strategy and technology employed. Thus, the Policy to Combat the Mobility of Crime changed the policing matrix, allowing greater efficiency of the resources used and better monitoring the indicators.

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A Dual-Band Omnidirectional Circular Polarized Antenna Using Composite Right/Left-Handed Transmission Line With Rectangular Slits for Unmanned Aerial Vehicle Applications

Cited by 14 publications

References 21 publications

Bandwidth enhancement of the omni‐directional and circularly‐polarized EZR‐MZR antenna

Bandwidth enhancement of the omni‐directional and circularly‐polarized EZR‐MZR antenna

Electrically Small Spiral PIFA for Deep Implantable Devices

Intelligent Technology to Enhance Policing and Public Accountability

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