Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements

Tang, Ming‐Chun; Ziolkowski, Richard W.

doi:10.1109/tap.2015.2477563

Cited by 23 publications

(8 citation statements)

References 36 publications

(56 reference statements)

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“…This outcome was more than four times larger than the original fixed capacitor (5.0 pF) version of this antenna, which had only a 0.84% fractional CP bandwidth. Moreover, the antenna was found to have a good impedance match, reasonably high radiation efficiency, and stable and uniform CP radiation patterns over its entire frequency-agile range [6].…”

Section: Multifunctional Esasmentioning

confidence: 99%

Overcoming traditional electrically small antenna tradeoffs with meta-structures

Ziolkowski

Tang

2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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Abstract-Metamaterial-inspired near-field resonant parasitic (NFRP) electrically small antennas (ESAs) have been designed and experimentally validated to have not only high radiation efficiencies, but also multi-functionality, large bandwidths, high directivities and reconfigurability. These expanded capabilities have been attained by introducing more complex metastructures, i.e., multiple NFRP elements loaded with fixed and tunable lumped elements, as well as active circuits. Different classes of passive and active NFRP ESAs that have successfully produced these effects will be reviewed, and several recently reported ESA systems will be introduced and discussed.

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Section: Multifunctional Esasmentioning

confidence: 99%

Overcoming traditional electrically small antenna tradeoffs with meta-structures

Ziolkowski

Tang

2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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“…For CP, large CLL NFRP elements are arranged in such a way that it should behave like a magnetic dipole and radiates LP vertical to it [165]. Using this concept an NFRP based antenna is proposed in [166] for CP characteristics. It consists of two monopole antennas with a single coaxial feedline loaded with two orthogonal CLL with similar configuration positioned vertically with regards to the ground plane demonstrates good AR and radiation efficiency as shown in Figure 26.…”

Section: A Mtm Loadingmentioning

confidence: 99%

Electromagnetic Metamaterials: A New Paradigm of Antenna Design

2021

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The progress of technology in consumer electronics demand an antenna having a compact size, high gain and bandwidth, and multiple antennas at transmitter and receiver to enhance the channel capacity. Over the last decade, numerous techniques are proposed to improve the performance of the antenna. One such technique is the use of metamaterials (MTMs) in antenna design. MTMs are artificial structures to provide unique electromagnetic properties that are not available in natural materials. The unique properties of these materials allow the design of high-performance antennas, filters, and microwave devices which cannot be obtained using traditional antennas. Loading antenna with the one, two, and three-dimensional MTM structures comprised of a periodic subwavelength unit cell exhibits RLC resonant structures and allows to manipulate electromagnetic waves in the antenna system. These structures offer low resonant frequency compared to the antenna resonant frequency resulting in antenna miniaturization and manipulation of electromagnetic waves helps in enhancing the gain and bandwidth, and achieving circular polarization (CP) of an antenna system. Also, metamaterial loading enhances isolation between the antenna elements in the multiple-input-multiple output (MIMO) system by suppressing the surface waves. In this paper, the electromagnetics of MTM with analytical expressions and its application in antenna design are discussed in detail. The MTM-based antennas are classified into MTM loading, MTM inspired antenna, metasurface loading, and composite right/left hand (CRLH) based antennas. The recent development in MTM inspired antenna and its application in antenna miniaturization, enhancing gain and bandwidth, achieving CP and mutual coupling suppression in MIMO antenna systems are discussed to make it useful for further research. INDEX TERMS Circular Polarization (CP), Metamaterial (MTM), gain, bandwidth, high impedance surface (HIS), mutual coupling, antenna miniaturization, composite right/left hand (CRLH).

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“…Antennas with features such as compact geometries, unique frequency agile characteristics and ease of use continue to be of great interest to antenna researchers and designers in many different areas [1]- [3]. Creating compact antennas with frequency agile characteristics are of particular interest in areas such as wireless sensors, aerospace systems and portable…”

Section: Introductionmentioning

confidence: 99%

Changing the Operation of Small Geometrically Complex EBG-Based Antennas With Micron-Sized Particles That Respond to Magneto-Static Fields

et al. 2020

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As the usage of wireless technology grows, there are evermore demands on the antennas that support these platforms. This need has led to the design of unique antennas with improved bandwidth, agile frequency capabilities, compact size and greater efficiencies. In part though, the trade-off for such capabilities is antenna complexity. This paper presents a new technique for simplifying the method of changing the operation of a printed antenna using micron-sized silver coated particles that respond to magneto-static fields. More specifically, a structure consisting of a low-loss dielectric material with a cylindrical cavity containing micro-sized particles is developed. The overall size of the dielectric material is 1.5 mm×1.5 mm×0.5 mm and the cavity has a diameter of 0.9 mm. Furthermore, the top and bottom of the cavity with the micron-sized particles is capped with copper foil. Then, to manipulate the enclosed particles, a static magnet is placed near the structure. The enclosed particles columnize and orientate in the direction of the field-lines, connecting the top and bottom copper foil plates. To disconnect the plates then, the field is simply removed and the columns collapse. Macroscopically, the structure has the behavior of a switch. The structures presented in this work are denoted as Magneto-static Field Responsive Structures (MRSs). The MRSs have an additional benefit of not requiring a direct connection to a biasing circuit. This is very useful because there are many antenna designs that make it difficult to embed biasing circuitry to reconfigure printed antennas using MEMS and PIN diodes, for example. Finally, a new frequency reconfigurable Electromagnetic Band Gap (EBG) antenna is presented. This design is unique because the complex layout does not allow for traditional biasing circuitry and the operation is changed using the new MRSs presented in this paper.INDEX TERMS EBG structures, magneto-static responsive structures (MRSs), printed antennas, reconfigurable antennas.

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Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements

Cited by 23 publications

References 36 publications

Overcoming traditional electrically small antenna tradeoffs with meta-structures

Overcoming traditional electrically small antenna tradeoffs with meta-structures

Electromagnetic Metamaterials: A New Paradigm of Antenna Design

Changing the Operation of Small Geometrically Complex EBG-Based Antennas With Micron-Sized Particles That Respond to Magneto-Static Fields

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