Title :
A Compact Double-Layer On-Body Matched Bowtie Antenna for Medical Diagnosis
Author :
Xuyang Li ; Jalilvand, Malyhe ; Sit, Yoke Leen ; Zwick, T.
Author_Institution :
Inst. fuer Hochfrequenztech. und Elektron. (IHE), Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany
Abstract :
A compact double-layer Bowtie antenna optimized for medical diagnosis is presented in this paper. This on-body antenna is matched to the human body to allow more energy to be radiated into the human body to obtain stronger reflections for image processing. By using a Bowtie antenna with double layers as well as a folded structure and meandered microstrip lines at the bottom of the antenna, a small size of 30 × 30 mm2 with a size reduction of 40% is achieved, compared to the reference antenna of 50 × 50 mm2 within the same operational frequency range. After the optimization of the antenna parameters, the antenna is characterized from 0.5 to 2 GHz, where the low frequencies enable a high penetration into human body and the large frequency range contributes to a high bandwidth and hence a fine range resolution. The simulated and measured results are shown with respect to the impedance matching, near-field pattern, gain and SAR distributions. With features such as a very small size, very low operational frequency, high front-to-back ratio, this design shows a high potential for use in medical diagnosis of stroke, breast cancer and water accumulation detection in the human body.
Keywords :
UHF antennas; biomedical imaging; bow-tie antennas; impedance matching; microstrip antennas; SAR distributions; antenna parameter optimization; breast cancer medical diagnosis; compact double-layer bowtie antenna; folded structure; frequency 0.5 GHz to 2 GHz; human body; image processing; impedance matching; meandered microstrip lines; near-field pattern; on-body matched bowtie antenna; size 30 mm; size 50 mm; stroke medical diagnosis; water accumulation detection; Antenna measurements; Antennas; Impedance matching; Liquids; Permittivity; Phantoms; Skin; Bowtie; meandered line; medical diagnosis; miniaturization; on-body matched; wideband;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2013.2297158