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
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Publication Number
US-11712169-B2
Publication Date
2023-08-01
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
The invention relates to an electromagnetic (EM) probe for monitoring at least one biological tissue. The probe includes a spiral antenna with at least one spiral arm having a spiral path originated from a feeding point, and an EM radiation absorbing layer mounted along a plurality of turnings of the spiral arm.
The absorbing layer is structured with absorbing material between a plurality of gaps wherein the absorbing material is not present, such that a spiral propagation path of the spiral arm passes via the plurality of gaps. The EM radiation absorbing layer is further formed as a plurality of concentric regions disposed along portions of the spiral antenna having equal surface of antenna conductor.
Each concentric region has an EM radiation absorption coefficient greater than any other concentric region it encloses. An amount of absorbing material disposed in each concentric region gradually increases as a function of a distance of each concentric region from the feeding point. A method aspect produces the EM probe by providing the spiral antenna and applying a layer of an EM absorbing material over a plurality of turnings of the spiral arm.
Claims Coverage
The document provides three independent claims: an EM probe, a method of producing the EM probe, and an array configuration of multiple EM probes. Across these independent claims, there are five main inventive elements.
Spiral antenna for biological tissue monitoring with feeding point
A spiral antenna having at least one spiral arm with a spiral path originated from a feeding point for monitoring at least one biological tissue.
EM radiation absorbing layer with absorbing material between gaps
An EM radiation absorbing layer mounted along a plurality of turnings of the spiral arm, the absorbing layer having absorbing material between a plurality of gaps wherein the absorbing material is not present, such that a spiral propagation path of the spiral arm passes via the plurality of gaps.
Concentric regions based on equal surface of antenna conductor
The EM radiation absorbing layer disposed in a plurality of concentric regions corresponding to portions of the spiral antenna having equal surface of antenna conductor.
Nested absorption coefficient greater in outer enclosed regions
Any of the plurality of concentric regions having an EM radiation absorption coefficient greater than any other of the plurality of concentric regions it encloses.
Gradually increasing absorbing-material amount with distance from feeding point
An amount of absorbing material disposed in each concentric region gradually increases as a function of a distance of each concentric region from the feeding point.
Overall, the claim set centers on a spiral antenna whose spiral propagation path passes through gaps formed by an EM radiation absorbing layer divided into concentric regions. The concentric regions are based on equal surface-area portions, with a hierarchy of EM radiation absorption coefficients between nested regions and a gradual increase in absorbing-material amount with distance from the feeding point.
Stated Advantages
Enables lower cutoff frequency.
Produces smoother amplitude/phase spectra with fewer notches/ripples.
Improves circular polarization in lower bands.
Reduces reflection-induced interference.
Documented Applications
Monitoring at least one biological tissue using an electromagnetic (EM) probe.
Using an array configuration comprising a plurality of EM probes for monitoring at least one biological tissue.
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