Low-Profile Conical-Pattern Slot Antenna With Wideband Performance Using Artificial Magnetic Conductors

Cao, Yun Fei; Zhang, Xiu Yin; Mo, Te

doi:10.1109/tap.2018.2809619

Cited by 31 publications

(26 citation statements)

References 21 publications

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“…In Reference 5, a wideband MTM antenna is considered using thin and biocompatible substrate‐superstrate layers to attain human body insulation and flexibility. A slotted wideband AMC antenna with enhanced bandwidth, gain and reduced SAR is proposed for WLAN in Reference 6. To insulate the antenna from human tissue, a multiband AMC surface is incorporated on the opposite side of the radiator and presented in Reference 7.…”

Section: Introductionmentioning

confidence: 99%

Design of antennas using artificial magnetic conductor layer to improve gain, flexibility, and specific absorption rate

Hazarika

Basu

Nandi

2020

Micro & Optical Tech Letters

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In this article, two miniaturized, dual-band, enhanced gain, flexible, low specific absorption rate (SAR) artificial magnetic conductor (AMC) integrated antennas operating at 2.4 GHz ISM and 3.9 GHz WiMAX bands have been proposed. Two compact monopoles with defected stepped ground structures have been used to improve the radiation characteristics while integrated with a common AMC surface. Defected dumbbell shaped unit-cell has been designed to obtain zero reflection phase and modify the material features. The capacitive effect of the AMC along with the defected stepped ground structures of the monopoles have excited two resonating bands and miniaturized the antennas. Proposed AMC has compensated the out-of-phase radiation toward main beam direction to increase the gain up to 8.6 dB, which is 85% more than that of the only monopole. The AMC has enhanced the reflectance exploiting the double-negative property and made the emitted radiation more directives. The integrated antennas have bestowed robust impedance matching in various bent condition by virtue of in phase reflection property. SAR values have been suppressed significantly up to 0.021 W/kg at a distance 5 mm from the human body, which is 99.5% better than that of the monopole alone

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Section: Introductionmentioning

confidence: 99%

Design of antennas using artificial magnetic conductor layer to improve gain, flexibility, and specific absorption rate

Hazarika

Basu

Nandi

2020

Micro & Optical Tech Letters

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“…[12][13][14][15][16][17][18][19][20][21][22]). In [12], a low-profile antenna with a conical radiation pattern was realised by combining a four-element slot antenna array with an AMC surface, but this design had a limited bandwidth (25.6% for S 11 < − 10 dB). A spiral-mode microstrip antenna was mounted on the interior surface of a helmet in [13] which resulted in a VSWR ≤ 3 from 1.35 to 2.70 GHz.…”

Section: Introductionmentioning

confidence: 99%

Broadband body‐worn antenna using a top‐loaded pyramidal radiator

Jackson

Merkley²

2020

IET Microwaves, Antennas & Propagation

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A wide‐bandw idth low‐profile quasi‐omnidirectional antenna is presented and experimentally demonstrated when integrated with a helmet for emergency services or military applications. The antenna consists of a pyramid‐shaped radiator that is top‐loaded with an etched copper‐clad microwave laminate with two shorting strips used to improve the input impedance matching, particularly for lower frequencies. The design and operation of the antenna are first introduced using a flat ground plane, and then experimental results are reported when it is installed on a helmet where the outer surface of the helmet is used as the ground plane. The results show a very wide impedance bandwidth from 890 MHz to 13.7 GHz (VSWR ≤ 3) and predominately monopole‐like radiation patterns up to ∼11 GHz. The antenna has a height of λ/16 at the lowest operating frequency of 890 MHz (21 mm). Simulation results with a human body model demonstrate the significantly improved omnidirectionality of the proposed helmet antenna compared to more conventional body‐worn antennas used in some applications.

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“…In recent years, with the development and application of metamaterials, the performance of antennas has been greatly improved. For example, electromagnetic bandgap (EBG) [4,5] and AMC [6][7][8] can effectively reduce the cross-sectional size of the antenna and improve the radiation performance of the antenna. In addition, loading FSS [9] can also improve the directional performance and bandwidth of the antenna.…”

Section: Introductionmentioning

confidence: 99%

Design of a Directional Antenna Based on a Resonance Based Reflector and Its Applications on Bio-Electromagnetics

Li¹,

Hua²,

Wen³

et al. 2020

PIER M

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A wideband resonance-based reflector (RBR) is proposed in this paper. It has an inphase reflection band from 2.61 GHz to 5.59 GHz (72.68%), while high reflection magnitude is also obtained in the band. The proposed RBR was applied to an elliptical monopole antenna, and then, the omnidirectional radiation patterns are transformed to be unidirectional ones. The antenna profile is only 0.12λ. The proposed antenna has a measured impedance band of 2.12 GHz to 6 GHz (95.57%) and a measured front-to-back ratio band (FBR > 10 dB) of 2.2 GHz to 4.68 GHz (72.09%). The maximum FBR is up to 27.21 dB, and the antenna has good radiation performances. In addition, the proposed antenna is applied to investigate the electromagnetic characteristics of a human head. The transmission characteristics of electromagnetic wave in human head and the interactions between the human head and the electromagnetic wave were studied. The field distribution and specific absorption rate (SAR) are also discussed. Research found that the antenna matched well with the human head as good field distribution and propagation characteristics were obtained, and the antenna meets the safety standards.

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Low-Profile Conical-Pattern Slot Antenna With Wideband Performance Using Artificial Magnetic Conductors

Cited by 31 publications

References 21 publications

Design of antennas using artificial magnetic conductor layer to improve gain, flexibility, and specific absorption rate

Design of antennas using artificial magnetic conductor layer to improve gain, flexibility, and specific absorption rate

Broadband body‐worn antenna using a top‐loaded pyramidal radiator

Design of a Directional Antenna Based on a Resonance Based Reflector and Its Applications on Bio-Electromagnetics

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