Next Article in Journal
Model Identification and Trajectory Tracking Control for Vector Propulsion Unmanned Surface Vehicles
Next Article in Special Issue
4-Port MIMO Antenna with Defected Ground Structure for 5G Millimeter Wave Applications
Previous Article in Journal
A Low-Distortion 20 GS/s Four-Channel Time-Interleaved Sample-and-Hold Amplifier in 0.18 μm SiGe BiCMOS
Previous Article in Special Issue
Full-Duplex NOMA Transmission with Single-Antenna Buffer-Aided Relays
Article

Design of a Wideband L-Shape Fed Microstrip Patch Antenna Backed by Conductor Plane for Medical Body Area Network

Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(1), 21; https://doi.org/10.3390/electronics9010021
Received: 5 November 2019 / Revised: 20 December 2019 / Accepted: 23 December 2019 / Published: 24 December 2019
This paper describes a compact patch antenna intended for medical body area network. The antenna is fed using a proximity coupling scheme to support the antenna that radiates in the free space and on the human body at the 2.45 GHz ISM band. The conductor plane is placed 2 mm or 0.0163λ00 is free space wavelength at 2.45 GHz) below the antenna to reduce backward radiation to the human body. Separation distance must be kept above 2 mm, otherwise, gain of the proposed antenna decreases when antenna is situated on the human body. The L-shape feed line is introduced to overcome impedance mismatch caused by the compact structure. The coupling gap between the proposed antenna and the length of the L-shape feed line are optimized to generate dual resonances mode for wide impedance bandwidth. Simulation results show that specific absorption rate (SAR) of the proposed antenna with L-shape feed line is lower than conventional patch antenna with direct microstrip feed line. The proposed antenna achieves impedance bandwidth of 120 MHz (4.89%) at the center frequency of 2.45 GHz. The maximum gain in the broadside direction is 6.2 dBi in simulation and 5.09 dBi in measurement for antenna in the free space. Wide impedance bandwidth and radiation patterns insensitive to the presence of human body are achieved, which meets the requirement of IoT-based wearable sensor. View Full-Text
Keywords: low profile antenna; impedance matching; medical body area network; dual resonances low profile antenna; impedance matching; medical body area network; dual resonances
Show Figures

Figure 1

MDPI and ACS Style

Guan, C.-E.; Fujimoto, T. Design of a Wideband L-Shape Fed Microstrip Patch Antenna Backed by Conductor Plane for Medical Body Area Network. Electronics 2020, 9, 21. https://doi.org/10.3390/electronics9010021

AMA Style

Guan C-E, Fujimoto T. Design of a Wideband L-Shape Fed Microstrip Patch Antenna Backed by Conductor Plane for Medical Body Area Network. Electronics. 2020; 9(1):21. https://doi.org/10.3390/electronics9010021

Chicago/Turabian Style

Guan, Chai-Eu, and Takafumi Fujimoto. 2020. "Design of a Wideband L-Shape Fed Microstrip Patch Antenna Backed by Conductor Plane for Medical Body Area Network" Electronics 9, no. 1: 21. https://doi.org/10.3390/electronics9010021

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop