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On the Performance of a Miniaturized Reactive Loaded Monopole Antenna for Ex Vivo Catheter Applications

Ganguly, D and Dash, JC and Sarkar, D (2023) On the Performance of a Miniaturized Reactive Loaded Monopole Antenna for Ex Vivo Catheter Applications. In: IEEE Access, 11 . pp. 14667-14676.

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Official URL: https://doi.org/10.1109/ACCESS.2023.3243642


In this paper, we propose a miniaturized series L-C loaded monopole antenna for catheter application in microwave ablation systems. Initially, a quarter wavelength long monopole antenna (Design1), having length 30 mm ( ≈ 0.24λ 0 where λ0 represents the free-space wavelength at 2.4 GHz operating frequency) using series LC loading concept is designed. The initial design is further extended to a miniaturized version (Design2) having length 5 mm ( 0.04λ0), showing nearly 83% size reduction compared to its former.Both the antennas are designed and simulated by immersing inside high permittivity egg white phantom (r = 63.84). Antenna Design 1 and 2 exhibit good impedance matching (S 11 < -12 dB) at and around the operating frequency with uniform monopolar radiation pattern having co-to-cross isolation of nearly 30-35 dB. Further, the in-phantom Specific Absorption Rate (SAR) values for both antennas are evaluated using simulation and verified with the measured SAR values such as 22 W/kg and 19.6 W/kg for Design1 and 2 respectively, using an in-house experimental setup. Moreover, the microwave ablation property of the proposed antennas is studied using simulated transient thermal gradient which translates to ablation zone formation. Here, Design 2 shows the advantage of having a low invasive diameter of 1.5 mm and near unity aspect ratio (AR) for the ablation zone as compared to Design1. © 2013 IEEE.

Item Type: Journal Article
Publication: IEEE Access
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Ablation; Aspect ratio; Catheters; Directional patterns (antenna); Microwave antennas; Phantoms, Clinical modality; Ex-vivo; Hyperthermia; Microwave ablation; Miniaturized; Operating frequency; Performance; Phantoms; Reactive loaded; Specific absorption rate, Monopole antennas
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 15 Mar 2023 06:09
Last Modified: 15 Mar 2023 06:09
URI: https://eprints.iisc.ac.in/id/eprint/80991

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