Compact Patch Antenna for Electromagnetic Interaction With Human Tissue at 434 MHz

Abstract

Single element loop, dipole and conventional square patch antennas have been used as hyperthermia applicators in the treatment of cancerous human cells at superficial depths inside the body. A smaller novel patch antenna in very close proximity to a phantom tissue model produces an enhanced specific absorption rate pattern without significant frequency detuning or impedance mismatch. The new patch increases its coupling aperture by supporting a combination of resonances that are also typical for loop, dipole and square patch antennas. For computation efficiency and clarity in the synthesized hyperthermia treatment conditions, simplified planar tri-layered tissue models interfaced with a waterbolus are used to study the permittivity loading on the antennas and the resultant specific absorption rates.

Design of a compact antenna with flared groundplane for a wearable breast hyperthermia system

“…Large matched impedance bandwidth is therefore desirable to enhance the overall system stability. The applicator should present tangentially aligned E-fields to improve energy deposition into the breast tissue, avoid hot spots in the skin, and to reduce the power required to couple energy into the tumour volume [31,37]. Avoiding the use of impedance matching circuits increases system eHciency and simplifies clinical integration.…”

Microstrip Antenna for Biomedical Application Based on Yagi Uda Technique

“…Experts suggested that to detect it as early as possible and to treat it. For treatment of tumourswhich are located close to the surface of the body, theelectromagnetic field energy is applied through externalantennas (applicators) [1], [2], [3]. Instead of treating any disease, prevention is far better option.…”

Auto Reconfigurable Patch Antenna for Biomedical Single Channel Multi-Frequency Microwave Radiometry Applications

“…As described before and in case of a single channel measurement, the dielectric properties of the medium change (shift) the central frequency (the frequency in which we have matching the input impedance) of the channel, so if we have a common antenna system the measurement would not be accurate, and we use the reconfigurable concept of a previous work of the authors [13] in which a set of varactor diodes are used to change the resonant frequency on demand [14][15][16].…”