Electromagnetic (EM) probes, methods of using such EM probes and systems which use such electromagnetic EM probes
Inventors
SAROKA, Amir • Voshin, Leonid • Barash, Yiftach • Almog, Benyamin • Levi, Tal
Assignees
Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-12161453-B2
Publication Date
2024-12-10
Expiration Date
Abstract
An electromagnetic (EM) probe for monitoring at least one biological tissue. The EM probe comprises a spiral antenna conductor (not shown) and an EM radiation absorbing layer (92) mounted along the antenna. The EM radiation absorbing layer has a plurality of substantially concentric frame shaped regions (93A-C) corresponding to portions of said spiral antenna having equal surface of antenna conductor, any of said plurality of concentric frame shaped regions has an EM radiation absorption coefficient different than any other of said neighboring concentric frame shaped regions.
Core Innovation
An electromagnetic probe is provided for monitoring at least one biological tissue. The probe includes a conducting cup shaped cavity having a flange around its opening and a spiral antenna contained in the conducting cup, with at least one spiral arm having a spiral path originated from a feeding point.
An electromagnetic radiation absorbing layer is mounted along a plurality of turnings of the at least one spiral arm. The absorbing layer includes absorbing material between a plurality of gaps wherein the absorbing material is not present, and the spiral propagation path passes via the plurality of gaps.
The absorbing layer is disposed in a plurality of concentric regions corresponding to portions of the spiral antenna having equal surface of antenna conductor. Any of the plurality of concentric regions has an electromagnetic radiation absorption coefficient greater than any other of the plurality of concentric regions it encloses, and optional probe and housing configurations include an array of electromagnetic probes and a cup shaped cavity and housing with flange and cavity absorbers.
Claims Coverage
The independent claim identifies 3 inventive features: a spiral antenna in a conducting cup for biological tissue monitoring, a concentric-region electromagnetic radiation absorbing layer with gaps traversed by a spiral propagation path, and a hierarchical absorption-coefficient relationship among concentric regions. Dependent claims further specify absorbing-layer geometry and positioning, optional antenna configurations, and gradient and cutout features.
Conducting cup shaped cavity with spiral antenna for biological tissue monitoring
An electromagnetic probe for monitoring at least one biological tissue includes a conducting cup shaped cavity having a flange around its opening and a spiral antenna contained in the conducting cup with at least one spiral arm having a spiral path originated from a feeding point.
Concentric-region electromagnetic radiation absorbing layer with gaps traversed by spiral propagation
An electromagnetic radiation absorbing layer mounted along a plurality of turnings of the at least one spiral arm has absorbing material between a plurality of gaps wherein the absorbing material is not present, and the spiral propagation path passes via the plurality of gaps.
Higher absorption coefficient in inner concentric regions than in enclosed regions
The electromagnetic radiation absorbing layer is disposed in a plurality of concentric regions corresponding to portions of the spiral antenna having equal surface of antenna conductor, wherein any of the plurality of concentric regions has an electromagnetic radiation absorption coefficient greater than any other of the plurality of concentric regions it encloses.
Overall claim coverage centers on integrating a spiral antenna in a conducting cup with an electromagnetic radiation absorbing layer organized into concentric regions containing gaps that the spiral propagation path passes through, with inner concentric regions having higher electromagnetic radiation absorption coefficients than the regions they enclose.
Stated Advantages
A measurement example indicates about 20% lower cutoff frequency with the absorbing layer versus probes without the absorbing layer.
The absorbing layer provides a smoother amplitude response with fewer notches and ripples compared with probes without the absorbing layer.
The absorbing layer improves circular polarization with a component difference of <=5 dB compared with probes without the absorbing layer.
Documented Applications
Monitoring biological tissue using an electromagnetic probe having a spiral antenna and an electromagnetic radiation absorbing layer arranged to be traversed by a spiral propagation path.
An example measurement using two probes coupled through human thorax is described, comparing a configuration with the absorbing layer to configurations without the absorbing layer.
Interested in licensing this patent?