Design of 1*4 Microstrip Antenna Array on the Human Thigh with Gain Enhancement

Abstract

In this paper, at first attempted to design and simulate a stacked circular microstrip patch antenna for high gain at frequency 2.45 GHz, to apply on the industrial, scientific, and medical (ISM) applications. The antenna needs to be minimized for the array mounted on the human thigh, which has high gain and pattern scan capability. The substrate with a high relative permittivity is used for the designed antenna to minimize the dimension of the antenna. A 1*4 array antenna is designed for mount on the human thigh. The amplitude and phase of each antenna are obtained using the maximum-gain theorem to achieve the maximum gain of this array antenna. The coaxial feed is used to achieve good impedance matching, low cross-polarization, and easy control of the amplitude and phase of the element. For designing this entire array antenna, three-dimensional electromagnetic field simulation software Ansoft HFSS based on the finite element method is applied. To experimentally verify the performance, a prototype of the array antenna is fabricated and measurement is performed. The realized gain of the designed array antenna at the resonant frequency is 11 dB. This array structure can be mounted on a human thigh, waist, or head for medical applications, depending on the specific radius.

KEYWORDS:

• Array
• Coaxial feed
• ISM applications
• Maximum gain theorem
• Microstrip antenna

Additional information

Notes on contributors

M. Mohammadi Shirkolaei

Morteza Mohammadi Shirkolaei was born in Savadkuh, Mazandaran, Iran in 1984. He received MSc and PhD degrees in electrical engineering from the Iran University of Science Technology in 2009 and 2019, respectively. In 2020, he joined the Department of Electrical Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran, where he is now an assistant professor. His major research interests include the analysis and design of the balanced CRLH structures; leaky wave antenna; phase array antenna; microwave devices; low noise amplifier; metamaterials; and magnetic materials.

H. R. Dalili Oskouei

Hamid Reza Dalili Oskouei received the PhD degree in electrical engineering from Tarbiat Modares University, Tehran, Iran, in 2009. In 2010, he joined the Department of Electrical Engineering, Shahid Sattari Aeronautical University of Science and Technology, as an associated professor. His research interests include wireless communication systems, radar, microwaves, and antenna. Email: [email protected]

M. Abbasi

Majid Abbasi received the MS degree from Iran University of Science and Technology (IUST) in 2010 and the PhD degree in electrical engineering at Malek Ashtar University of Technology Tehran, Iran (MUT) in 2018. His main research interests include topology and control of power converters, analog systems. Email: [email protected]