Conformal microstrip slot antenna with an AMC reflector for hyperthermia

Sahu, Bhagirath; Singh, S. P.

doi:10.1080/09205071.2016.1207568

Cited by 23 publications

(22 citation statements)

References 19 publications

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“…[7][8][9] Therefore, planar applicators (compact and conformal) have been investigated that overcome the drawbacks of nonplanar applicators. 10 Many planar antennas are designed and investigated, having different shapes (spiral loop, slot) and compact sizes [10][11][12][13] for hyperthermia applications. However, a double spiral antenna offers a smaller size, provides uniform heating, and is not sensitive to input frequency or parameter fluctuation.…”

Section: Introductionmentioning

confidence: 99%

“…For hyperthermia application, to improve the radiation pattern, penetration depth (PD), and effective field size (EFS) of a spiral antenna and for directive field pattern, a conducting ground plane (as a reflector) and lens structures have been proposed in the literature. 13,22,23 These applicators provide PD up to 30 mm and have a large structure size. Further, to reduce the size of the applicator, an artificial magnetic conductor (AMC) 13 is placed at the backside of an antenna (5 mm distance); this makes the structure compact but provides PD up to 28 mm only.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Microwave applicators have been proposed for applications in various areas, such as food cooking in domestic and industrial field, microwave-assisted extraction in environmental and chemical field [1,2], microwave-assisted synthesis in industrial material processing, bio-technology and chemical-pharmaceutics industry [3,4], drying, sterilization and disinfestation in agri-food [5,6] and microwave diathermy, hyperthermia cancer treatment and thermo-ablation therapy in medicine [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Microwave applicators can be divided into external and internal applicators depending on their peculiar use. External microwave applicators for superficial cancer, have been investigated and described in literature [7][8][9][10][11][12][13]. They typically consist of a single radiating element or of an antenna array placed in contact with the skin surface.…”

Section: Introductionmentioning

confidence: 99%

“…A water bolus is usually placed between the applicator and the body in order to improve the matching of the antenna and at same time maintain the temperature of the skin at normal human body level. Among the various types of antennas studied for the external applicators there are waveguide and horn antennas [8], phased array antennas [9], and patch antennas [10][11][12]. Different shapes-rectangular, circular, and horseshoe-have been considered for the radiating slot of microstrip antennas for microwave hyperthermia treatment of cancer [13].…”

Section: Introductionmentioning

confidence: 99%

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A Split Ring Resonator-Based Metamaterial for Microwave Impedance Matching with Biological Tissue

2020

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A metamaterial lens based on a split ring resonator (SRR) array has been designed and optimized to improve the focusing and the penetration depth in human biological tissue of a microwave beam irradiated by a substrate integrated waveguide (SIW) cavity backed patch antenna. The impedance matching of the antenna loaded with human tissue is strongly improved. The simulations have been performed by using CST Microwave Studio®. A prototype of the device has been fabricated with the printed board circuits (PCB) process and has been characterized using a Network Analyzer and an antenna measurement system in anechoic chamber. A novel microwave applicator for hyperthermia therapy of skin cancer could be developed. The performances of the proposed applicator have been evaluated in terms of measured S11 scattering parameter modulus and simulated power loss density. The obtained results indicate that an SRR-based metamaterial is a promising solution for external microwave applicators to employ in dermatology.

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Microwave Hyperthermia Technology Based on Near‐Field Focused Metasurfaces: Design and Implementation

Xiong,

Xie,

Liu

et al. 2024

Adv Funct Materials

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This paper presents a near‐field focused metasurface design method for microwave hyperthermia. Utilizing full‐wave electromagnetic simulation, a novel dual‐layer metasurface unit with the following characteristics is developed: transmission efficiency higher than −1 dB, adjustable transmission phase from 0° to 360°, and insensitivity to the polarization and incident angle of the incoming wave. Leveraging phase compensation theory, the units at different positions in the array to achieve near‐field focusing functionality is meticulously designed. To further optimize transmission efficiency, the transmission phase of the central unit of the metasurface to 76° is tuned. When applying this near‐field focused metasurface to microwave hyperthermia, the electromagnetic and thermal effects in biological tissues is conducted simulations and experiments to analyzed. The results demonstrate that the proposed metasurface can effectively focus microwave energy, achieving efficient microwave transmission in pork tissue and generating localized high temperatures in the target area. This research introduces new design concepts and implementation strategies for the development of microwave hyperthermia technology.

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Conformal microstrip slot antenna with an AMC reflector for hyperthermia

Cited by 23 publications

References 19 publications

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

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

A Split Ring Resonator-Based Metamaterial for Microwave Impedance Matching with Biological Tissue

Microwave Hyperthermia Technology Based on Near‐Field Focused Metasurfaces: Design and Implementation

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