Gain enhancement in probe-fed hexagonal ultra wideband antenna using AMC reflector

Joshi, Abhishek; Singhal, Rahul

doi:10.1080/09205071.2019.1605939

Cited by 26 publications

(15 citation statements)

References 24 publications

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“…In this antenna, horizontal and vertical strips are fused with partial ground plane to obtain wideband characteristics. Joshi et al deigned the hexagonal antenna for UWB applications using AMC reflector to improve the gain and bandwidth of designed antenna. Sawant et al illustrated the hexagonal antenna using fractal geometry to obtain ultra‐wideband characteristics (3.1‐10.6 GHz).…”

Section: Introductionmentioning

confidence: 99%

“…It has been observed that antenna designed in Reference has explained the nested hexagonal ring‐shaped antenna for UWB applications (2.94‐12.57 GHz) but has not envisaged the filtering concept which is prominently required to avoid the interference in the UWB frequency range. Conventional hexagonal‐shaped antenna has been revealed in Reference which operates on single frequency and depicts very low bandwidth. References and also designed and investigated the hexagonal‐shaped antennas but antennas expounded in this manuscript are compact in size, exhibit more number of frequency bands and wider bandwidth in comparison to existing work reported in Table .…”

Section: Introductionmentioning

confidence: 99%

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Performance enhancement of nested hexagonal ring‐shaped compact multiband integrated wideband fractal antennas for wireless applications

Sharma

Bhatia

2019

Int J RF Microw Comput Aided Eng

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In this paper, nested hexagonal ring-shaped fractal antennas are designed and investigated which are different from each other in patch orientation. Initially, the multiband integrated wideband hexagonal nested ring antenna is designed (antenna-I). To improve the multiband/wideband behavior, the patch orientation of antenna-I is changed to −60 /60 (antenna-II), −120 /120 (antenna-III), and −180 /180 (antenna-IV). Antennas are designed on low cost FR-4 glass epoxy substrate with relative permittivity of 4.4 and overall dimension 30 × 30 × 1.6 mm 3 . Comparison among antennas have been made and found that the antennas with negative orientation exhibit better results in terms of bandwidth, impedance matching, number of frequency bands, and gain. Designed antennas have been compared with each other and found that antennas-II and III are better in performance as compared to antennas-I and IV. Antenna-II exhibits wider bandwidth of 1.26 (2.52-3.78 GHz), 2.75 (4.03-6.78 GHz), and 6.1 GHz (7.82-13.92 GHz) with maximum gain of 7.14 dB. Similarly; antenna-III exhibits the bandwidth of 340 MHz (1.92-2.26 GHz), 820 MHz (3.04-3.86 GHz), 4230 MHz (5.38-9.61 GHz), and 3040 MHz (10.41-13.45 GHz) with a maximum gain of 6.19 dB. Prototype of the designed antennas with satisfactory orientations are fabricated and tested for the validation of results. Simulated and measured results are also juxtaposed and observed in good agreement with each other. Antennas exhibit bidirectional and omnidirectional pattern in E-plane and H-plane, respectively, also the radiation efficiency of antennas are in acceptable range from 75% to 95%. Due to the wider bandwidth of designed antennas, they can be used for different wireless standards such as Advance Wireless Services AWS-1, AWS-2, AWS-3, Wi-MAX, WLAN, X-band satellite communication, point-to-point wireless applications, ITU band, military satellite communication, television broadcasting, and military land and airborne systems. K E Y W O R D S fractal antenna, multiband, nested hexagonal ring, wideband

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance enhancement of nested hexagonal ring‐shaped compact multiband integrated wideband fractal antennas for wireless applications

Sharma

Bhatia

2019

Int J RF Microw Comput Aided Eng

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“…30 A loop and ring AMC reflectors are also used for ease of design and to improve the gain of antennas. 29,31,32 Therefore, this article concentrates on the design and development of a hybrid structure composed of the ring-and square-shaped slots to enhance the proposed antenna gain. The proposed hybrid AMC structure also has additional square slots that look like a plus sign that change the reactance of the structure and makes it a compact structure.…”

Section: Amc Structure Designmentioning

confidence: 99%

Design and development of a double spiral antenna with an artificial magnetic conductor structure for hyperthermia treatment

Sharma

Kaur

Khanna

et al. 2022

Int J RF Mic Comp-Aid Eng

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A double spiral antenna with an artificial magnetic conductor (AMC) is designed, fabricated, and experimentally tested for hyperthermia treatment as a microwave power radiator. The proposed double spiral antenna has a compact structure, designed on an FR4 substrate with a thickness of 1.6 mm, and the dimensions of the proposed antenna is 32 Â 32 Â 3.27 mm 3 . The width and space between the spiral arms is 1.54 and inner and outer radius of the spiral is arm 1 and 12.82 mm. The antenna is fed by aperture feeding having dimensions of 16 Â 14 mm 2 that enhances the antenna's bandwidth. Further, an AMC unit cell (as a reflector) is designed to enhance the proposed antenna's performance, which is designed on an FR4 substrate with a size of 16 Â 16 Â 1.6 mm 3 . The size of an AMC structure is optimized to 64 Â 64 mm 2 , consisting of 4 Â 4 unit cells and placed at a 5 mm distance at the backside of a double spiral antenna, which enhances the directivity, and gain of the proposed antenna and also converges backfield in the forward direction. At a 5 mm distance, the AMC structure behaves as a reflector and converges all back field radiation in the required direction to make a directional radiation pattern which enhances the antenna's bandwidth and gain.The proposed applicator (antenna + AMC structure) is simulated with a heterogeneous phantom (112 Â 112 Â 86 mm 3 ), and the performance of the applicator is evaluated by using a specific absorption rate (SAR) in terms of penetration depth (PD) and effective field size (EFS) inside the phantom. The PD and EFS are improved when an AMC structure is placed at the backside of the antenna. Further, the proposed applicator is analyzed for the regular shape of the tumor inserted in the phantom, with the tumor size as 20 Â 20 Â 10 mm 3, located at 10 mm distance from the skin surface. The study of temperature distribution inside the phantom is also done when 2.5 W of power is applied to the applicator in a simulation environment, a temperature rise of the tumor that between the range of 41-45 C is observed, allowing the proposed antenna with an AMC structure to be a good choice for the hyperthermia treatment.

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“…Moreover, the radiation that penetrates into the human cells is a major health concern [13][14][15]. Metamaterials such as Artificial Magnetic Conductor (AMC) and Frequency Selective Surface (FSS) were first used due to its ability to increase gain and improve the radiation performances of the antenna [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Improvements of trapezoid antenna gain using artificial magnetic conductor and frequency selective surface

Ali

Abu

Zabri

2020

IJEECS

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<span>This paper presents the performance enhancement of the trapezoid antenna with Artificial Magnetic Conductor (AMC) and Frequency Selective Surface (FSS). The antenna, AMC and FSS structures are printed on 0.254 mm of RT/Duroid 5880 high frequency laminate. The performances of the antenna with and without AMC and FSS were evaluated. Three cases are analyzed; antenna alone, antenna with AMC and antenna with AMC-FSS. The 2x3 arrays of AMC and AMC-FSS were positioned at the back of the antenna with 6 mm air gap. The antenna alone works at 12 GHz, and shifted to 12.35 GHz and 12.33 GHz for case 2 and case 3, respectively. Despite the shift in the resonance, the antenna is still operating well at 12 GHz with a return loss –16.70 dB for case 2 and–16.84 dB for case 3. Case 3 effectively enhanced the antenna gain from 4.43 dB to 6.74 dB and contributed to a directive antenna. Moreover, case 3 also successfully reduced the radiation of the antenna that penetrates into human body as the antenna is applied for on-body applications. </span>

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Gain enhancement in probe-fed hexagonal ultra wideband antenna using AMC reflector

Cited by 26 publications

References 24 publications

Performance enhancement of nested hexagonal ring‐shaped compact multiband integrated wideband fractal antennas for wireless applications

Performance enhancement of nested hexagonal ring‐shaped compact multiband integrated wideband fractal antennas for wireless applications

Design and development of a double spiral antenna with an artificial magnetic conductor structure for hyperthermia treatment

Improvements of trapezoid antenna gain using artificial magnetic conductor and frequency selective surface

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