A Miniaturized Dual-Band Implantable Antenna System for Medical Applications

Abstract In this paper, a miniaturized implantable antenna system for biomedical applications is presented. The system consists of almost two similar patch antennas, named internal and external. The internal antenna is implanted inside the body at a depth of 2 mm, and the external antenna is to be attached to the body aligned with the internal one. The antenna system consists of implant-side antenna with dimensions are 10.25×10.25×1.27 mm3 , while the external antenna dimensions are 11.1×11.1×1.27 mm3. The proposed antennas designs showed dual resonant frequency on ISM bands (ie , 915 MHz and 2450 MHz ). The computed -10 dB bandwidth considering three-layer human phantom demonstrates that a bandwidth of 870 to 970 MHz and 2.38 to 2.47 GHz for internal and external antennas are achieved. The Specific Absorption Rate (SAR) has been considered for health care consideration. The measured and simulated scattering parameters are compared, and good agreements are achieved. The proposed antenna system is simulated and investigated for biomedical applications suitability.

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Metamaterial-Loaded Compact High-Gain Dual-Band Circularly Polarized Implantable Antenna System for Multiple Biomedical Applications

IEEE Transactions on Antennas and Propagation ◽

10.1109/tap.2019.2938573 ◽

2020 ◽

Vol 68 (2) ◽

pp. 1140-1144 ◽

Cited By ~ 4

Author(s):

Muhammad Zada ◽

Izaz Ali Shah ◽

Hyoungsuk Yoo

Keyword(s):

Biomedical Applications ◽

High Gain ◽

Antenna System ◽

Dual Band ◽

Circularly Polarized ◽

Implantable Antenna

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A compact omnidirectional to directional frequency reconfigurable antenna for wireless sensor network applications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000994 ◽

2021 ◽

pp. 1-12

Author(s):

Melvin Chamakalayil Jose ◽

Radha Sankararajan ◽

Balakrishnapillai Suseela Sreeja ◽

Mohammed Gulam Nabi Alsath ◽

Pratap Kumar

Keyword(s):

Wireless Sensor Network ◽

Sensor Network ◽

Radiation Pattern ◽

Antenna System ◽

Wireless Sensor ◽

Dual Band ◽

Design Parameters ◽

Pin Diodes ◽

Band Frequency ◽

Directional Radiation

Abstract In the proposed research paper, a novel compact, ultra-wideband electronically switchable dual-band omnidirectional to directional radiation pattern microstrip planar printed rectangular monopole antenna (PRMA) has been presented. The proposed antenna system has an optimum size of 0.26 λ0 × 0.28 λ0. A combination of radiators, reflectors, and two symmetrical grounds does place on the same layer of the rectangular microstrip PRMA. The frequency agility and the radiation pattern from omnidirectional to directional are achieved using two SMD PIN diodes (SMP1340-04LF). The directional radiation patterns with 180° phase shifts are achieved at the C-band frequency spectrum. The parametric study of the proposed antenna system was performed for different design parameters, and the antenna characteristics were analyzed. An antenna prototype is fabricated using the printed circuit board etching method by using RMI UV laser etching and cutting tools. The measurements of the proposed antenna are conducted in an anechoic chamber to validate the simulations. There are three states of operations due to two SMD PIN diodes being used in switching circuits. In state-I, the proposed antenna radiates at 6.185 GHz (5.275–6.6 75 GHz) in the Ф = 270° direction with a gain of 2.1 dBi, whereas in state-II, it radiates at 5.715 GHz (5.05–6.8 GHz) in the Ф = 90° direction with a gain of 2.1 dBi. In state-III, the antenna exhibits the X-band frequency with center frequency at 9.93 GHz (8.845–10.49 GHz), and the omnidirectional pattern offers a gain of 4.1 dBi. The features of the proposed antenna are suitable for high-speed wireless sensor network communication in industries such as chemical reactors in oil and gas and pharmaceuticals. It is also well suited for IoT and 5G-sub-6-GHz applications.

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