Miniaturized Annular Ring Slot Antenna for Small/Mini Uav Applications

Sun, Ling Ling; Sun, Baohua; Sun, Qizhen; Huang, Wei

doi:10.2528/pierc14090302

Cited by 20 publications

(17 citation statements)

References 9 publications

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“…However, high-contrast dielectric/magnetic materials add a considerable mass to the antenna and increase losses. Other prevailing techniques in antenna miniaturization are capacitive and inductive loading [5], folded patch design [6], and altering the shape of the patch to reduce the resonance frequency [7][8][9][10]. Moreover, the meander line technique is used to realize electrically small antennas.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Tm21 Mode Circular Microstrip Patch Antenna

Naik¹

2019

PIER Letters

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A miniaturized TM 21 mode circular patch antenna is introduced. The miniaturization is realized by loading the patch with four symmetric radial slits, which facilitate elongating the current path and thus reducing the resonant frequency and the patch size. In particular, the eigenvalue of the proposed higher order mode is reduced to that of a conventional dominant TM 11 mode antenna, resulting in about 40% reduction in the radius. The effects of the slit geometry on miniaturization and resonant frequency are studied. The measurement results are also presented, which are in good agreement with the simulation ones. Such miniaturized TM 21 patch antennas with conical radiation patterns have manifold applications in phased array antennas for booming communication demands.

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Section: Introductionmentioning

confidence: 99%

A Miniaturized Tm21 Mode Circular Microstrip Patch Antenna

Naik¹

2019

PIER Letters

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“…Co3O4 is considered a promising catalyst material for Li-air batteries [25][26][27][28][29], as well as a high-capacity anode material for Li-ion batteries [30][31][32][33]. The Co3O4 nanofibers, which acted as electron pathways, were strongly attached to the Ni mesh because they were grown directly on it.…”

Section: Introductionmentioning

confidence: 99%

Carbon and Binder-Free Air Electrodes Composed of Co3O4 Nanofibers for Li-Air Batteries with Enhanced Cyclic Performance

Lee¹,

Park²

2016

Nano Online

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(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.In this study, to fabricate a carbon free (C-free) air electrode, Co3O4 nanofibers were grown directly on a Ni mesh to obtain Co3O4 with a high surface area and good contact with the current collector (the Ni mesh). In Li-air cells, any C present in the air electrode promotes unwanted side reactions. Therefore, the air electrode composed of only Co3O4 nanofibers (i.e., C-free) was expected to suppress these side reactions, such as the decomposition of the electrolyte and formation of Li2CO3, which would in turn enhance the cyclic performance of the cell. As predicted, the Co3O4-nanofiber electrode successfully reduced the accumulation of reaction products during cycling, which was achieved through the suppression of unwanted side reactions. In addition, the cyclic performance of the Li-air cell was superior to that of a standard electrode composed of carbonaceous material.

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“…In [2], placement of a backed metallic plate at very large distances, for enhancement of gain, may increase the overall volume of the structure. Recently, a probe-fed annular ring slot antenna [4] is miniaturized by several conductive vias where matching is improved by backing the structure with a ring cavity. Due to the size reduction of the antenna, impedance bandwidth has been adversely affected owing to the increased quality factor of the radiator.…”

Section: Introductionmentioning

confidence: 99%

Miniaturization and Bandwidth Enhancement of a CPW-Fed Annular Slot Antenna Using Ris

Samanta¹,

Mitra²,

Chaudhuri³

2017

PIER Letters

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Abstract-In this paper a CPW-fed annular slot antenna is miniaturized with enhanced impedance bandwidth using a reactive impedance surface (RIS) substrate. The RIS is realized by patterning 3 × 3 array of circular elements over an inexpensive FR-4 substrate which is backed by a circular metallic plane. Due to the compensation of electric and magnetic energy stored by antenna and RIS substrate respectively, the antenna resonance frequency is shifted by 53.6% compared with a simple annular slot antenna. By the inclusion of such reactive surface, input impedance of the antenna is reduced, and a remarkable improvement in impedance bandwidth from 11.66% to 64.26% is also noticed. Therefore, both miniaturization and bandwidth enhancement are achieved simultaneously with the present loading technique. The directivity of the RIS loaded antenna is increased further by loading a concentric metallic ring over the RIS loaded structure at a height above the RIS plane. The Ring & RIS loaded structure is fabricated for measurement purpose. A good agreement is obtained between the simulated and measured results for both RIS loaded and Ring & RIS loaded configurations. The ring loading over the RIS antenna provides improvement in directivity about 5 dB. The peak gain and bandwidth are measured at −1.03 dBi and 58.62%, respectively.

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Miniaturized Annular Ring Slot Antenna for Small/Mini Uav Applications

Cited by 20 publications

References 9 publications

A Miniaturized Tm21 Mode Circular Microstrip Patch Antenna

A Miniaturized Tm21 Mode Circular Microstrip Patch Antenna

Carbon and Binder-Free Air Electrodes Composed of Co3O4 Nanofibers for Li-Air Batteries with Enhanced Cyclic Performance

Miniaturization and Bandwidth Enhancement of a CPW-Fed Annular Slot Antenna Using Ris

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