Electromagnetic field band-stop filter

Patent metadata

Field	Value
Publication number	US-11916274-B2
Application number	US-201916971728-A
Country	US
Kind code	B2
Filing date	Feb 21, 2019
Priority date	Feb 26, 2018
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

An electromagnetic field band-stop filter includes a plurality of unit structures that have reflection characteristics on an electromagnetic wave of a predetermined frequency. Each of the plurality of unit structures includes: a plurality of electrode parts each of which is disposed along a side of a polygon in a non-contact manner with another electrode part; and a plurality of conductor parts which are provided for the plurality of electrode parts on a one-to-one basis and each of which has at least one bent portion between one end and other end, the one ends of the plurality of conductor parts being connected to the electrode parts on a one-to-one basis and the other ends of the plurality of conductor parts being connected at one point on an inner side of the electrode parts in the individual unit structure. The plurality of unit structures are regularly and two-dimensionally disposed by disposing electrode parts of the plurality of unit structures to be adjacent to each other with a spacing that reflects the predetermined frequency.

First claim

The invention claimed is:

1. An electromagnetic field band-stop filter, comprising a plurality of unit structures that have reflection characteristics on an electromagnetic wave of a predetermined frequency, wherein each of the plurality of unit structures includes: a plurality of electrode parts each of which is disposed along a side of a polygon in a non-contact manner with another electrode part; and a plurality of conductor parts which are provided for the plurality of electrode parts on a one-to-one basis and each of which has at least one bent portion between one end and an other end, the one ends of the plurality of conductor parts being connected to the electrode parts on a one-to-one basis and the other ends of the plurality of conductor parts being connected at one point on an inner side of the electrode parts in the individual unit structure, wherein the plurality of unit structures are regularly and two-dimensionally disposed by disposing electrode parts of the plurality of unit structures to be adjacent to each other with a spacing that reflects the predetermined frequency, wherein the plurality of electrode parts each of which has a flat-plate portion and is disposed in such a manner that a long side of the flat-plate portion is disposed along a side of the polygon, wherein the bent portion of the conductor part has a shape forming an outline between one end and the other end of the conductor part, wherein the electromagnetic field band-stop filter further includes a first sub-resonator forming a conductive plate that is disposed overlapping at least a part of the flat-plate portion of each of the adjacent electrode parts with a predetermined spacing therebetween and that adds electrical capacitance in parallel to electrical capacitance which the adjacent electrode parts have, and wherein the electromagnetic field band-stop filter further includes a second sub-resonator which has a ring shape corresponding to a shape of an outline formed by the bent portion of the conductor part and which is disposed in such a manner that at least a part of the ring shape two-dimensionally overlaps with at least a part of the bent portion of the conductor part so that, when a current flows through the ring shape, a direction of the current in at least a part of the ring shape becomes the same as, when a current flows through the conductor part, a direction of the current in at least a part of the bent portion of the conductor part.

2. An electromagnetic field band-stop filter, comprising a plurality of unit structures that have reflection characteristics on an electromagnetic wave of a predetermined frequency, wherein each of the plurality of unit structures includes: a plurality of electrode parts each of which is disposed along a side of a polygon in a non-contact manner with another electrode part; and a plurality of conductor parts which are provided for the plurality of electrode parts on a one-to-one basis and each of which has at least one bent portion between one end and an other end, the one ends of the plurality of conductor parts being connected to the electrode parts on a one-to-one basis and the other ends of the plurality of conductor parts being connected at one point on an inner side of the electrode parts in the individual unit structure, wherein the plurality of unit structures are regularly and two-dimensionally disposed by disposing electrode parts of the plurality of unit structures to be adjacent to each other with a spacing that reflects the predetermined frequency; wherein the plurality of electrode parts each of which has a flat-plate portion and is disposed in such a manner that a long side of the flat-plate portion is disposed along a side of the polygon, and wherein the electromagnetic field band-stop filter further includes a sub-resonator forming a conductive plate that is disposed overlapping at least a part of the flat-plate portion of each of the adjacent electrode parts with a predetermined spacing therebetween and that adds electrical capacitance in parallel to electrical capacitance which the adjacent electrode parts have.

3. The electromagnetic field band-stop filter according to claim 2 , wherein a spacing between the sub-resonator and the electrode part is one tenth or less of an arrangement spacing between the plurality of unit structures.

4. An electromagnetic field band-stop filter, comprising a plurality of unit structures that have reflection characteristics on an electromagnetic wave of a predetermined frequency, wherein each of the plurality of unit structures includes: a plurality of electrode parts each of which is disposed along a side of a polygon in a non-contact manner with another electrode part; and a plurality of conductor parts which are provided for the plurality of electrode parts on a one-to-one basis and each of which has at least one bent portion between one end and an other end, the one ends of the plurality of conductor parts being connected to the electrode parts on a one-to-one basis and the other ends of the plurality of conductor parts being connected at one point on an inner side of the electrode parts in the individual unit structure, wherein the plurality of unit structures are regularly and two-dimensionally disposed by disposing electrode parts of the plurality of unit structures to be adjacent to each other with a spacing that reflects the predetermined frequency, wherein the bent portion of the conductor part has a shape forming an outline between one end and the other end of the conductor part, and wherein the electromagnetic field band-stop filter further includes a sub-resonator which has a ring shape corresponding to a shape of an outline formed by the bent portion of the conductor part and which is disposed in such a manner that at least a part of the ring shape two-dimensionally overlaps with at least a part of the bent portion of the conductor part so that, when a current flows through the ring shape, a direction of the current in at least a part of the ring shape becomes the same as, when a current flows through the conductor part, a direction of the current in at least a part of the bent portion of the conductor part.

5. The electromagnetic field band-stop filter according to claim 4 , wherein a spacing between the sub-resonator and the conductor part is one tenth or less of an arrangement spacing between the plurality of unit structures.

6. The electromagnetic field band-stop filter according to claim 4 , wherein a length of the conductor part in a short-side direction is shorter than a short side of the electrode part.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Itami Go
• Toriumi Yohei
• Okamoto Ken
• Kato Jun

Classifications

• H01P1/20 Primary

  Frequency-selective devices, e.g. filters · CPC title

• H01Q1/526

  Electromagnetic shields · CPC title

• H01Q15/0013

  said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective · CPC title

• H01P1/2005 Primary

  Electromagnetic photonic bandgaps [EPB], or photonic bandgaps [PBG] · CPC title

• H05K9/00

  Screening of apparatus or components against electric or magnetic fields (devices for absorbing radiation from an antenna H01Q17/00) · CPC title