Absortion sheet for absorbing power from an electromagnetic wave, system for performing a radiation characterization, method for measuring an electromagnetic radiative near field using the same
AssigneeMXWaves AB
InventorsDaniel Sjöberg, Mats Gustafsson, Johan Lundgren
Life of this patent
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Abstract
An absorption sheet for absorbing power from an electromagnetic wave generated by a device under test includes a substrate and an array of absorption elements. Each absorption element includes a conductive portion and a resistive portion. A system for performing a radiation characterization includes the absorption sheet. A method of measuring a radiative near field of a device under test and a method of characterizing a radiative near field of a device under test are also disclosed.
Claims17
An absorption sheet for absorbing power from an electromagnetic wave generated by a device under test, the absorption sheet comprising:
- a substrate having a thermal conductivity k lower than 1 W/m/K and a electrical conductivity σ lower than 10−4 S/m;
- an array of absorption elements configured to absorb electromagnetic energy from the electromagnetic wave, the array of absorption elements embedded in or arranged on the substrate, each absorption element comprising:
- a conductive portion made of an electrically conductive material, wherein the conductive portion is adapted to receive the electromagnetic wave;
- and
- a resistive portion embedded in the conductive portion, the resistive portion adapted to absorb heat from a current generated by the electromagnetic wave in the conductive portion,
- wherein the conductive portion comprises a first element part and a second element part, wherein the first element part and the second element part are separated by the resistive portion, and
- wherein each absorption element has an elongate and planar body.
A system for performing a radiation characterization of a device under test, the system comprising:
- an absorption sheet for absorbing energy from an electromagnetic wave generated by the device under test, comprising:
- a substrate having a thermal conductivity k lower than 1 W/m/K and an electrical conductivity σ lower than 10−4 S/m;
- an array of absorption elements configured to absorb electromagnetic energy from the electromagnetic wave, the array of absorption elements embedded in or arranged on the substrate, each absorption element comprising:
- a conductive portion made of an electrically conductive material, wherein the conductive portion is adapted to receive the electromagnetic wave;
- and a resistive portion embedded in the conductive portion, the resistive portion adapted to absorb heat from a current generated by the electromagnetic wave in the conductive portion, or wherein each absorption element comprises one material which is both electrically conductive and adapted to absorb heat generated by the electromagnetic wave, wherein the conductive portion comprises a first element part and a second element part, wherein the first element part and the second element part are separated by the resistive portion, and
- wherein each absorption element has an elongate and planar body;
- a thermal imaging camera;
- and
- a processing unit configured to convert images from the thermal imaging camera providing a heat distribution to a corresponding radiation distribution of the electromagnetic wave.
A method of measuring a radiative near field of a device under test, the method comprising the steps of:
- providing an absorption sheet comprising an array of isolated absorption elements configured to absorb electromagnetic energy from an electromagnetic wave from the device under test and generate heat locally in the absorption elements, each absorption element comprising a conductive portion made of an electrically conductive material and adapted to receive the electromagnetic wave and a resistive portion embedded in the conductive portion, wherein the resistive portion is adapted to absorb heat from a current generated by the electromagnetic wave in the conductive portion, wherein the conductive portion comprises a first element part and a second element part, wherein the first element part and the second element part are separated by the resistive portion, and wherein each absorption element has an elongate and planar body;
- arranging the absorption sheet in proximity to the device under test;
- enabling the device under test to generate the electromagnetic wave;
- obtaining thermal images of the absorption sheet;
- and
- converting the thermal images to a distribution of magnitudes of the electromagnetic wave of the absorption sheet.
Dependencies are inferred from the claim text.