Antenna formed on flexible dielectric laminated body
An antenna includes: a dielectric laminated body including a plurality of dielectric layers being laminated; a dielectric substrate bonded to one of surfaces of the dielectric laminated body; and a radiation element pattern layer, a conductive ground layer, and a conductive pattern layer each formed in a different place in any of both the surfaces and between the dielectric layers of the dielectric laminated body. The radiation element pattern layer, the conductive ground layer, and the conductive pattern layer are formed in an order of the radiation element pattern layer, the conductive ground layer, and the conductive pattern layer from a dielectric substrate side toward an opposite side. The radiation element pattern layer includes one or more radiation elements, the conductive pattern layer includes a feed line configured to feed power to the radiation elements, the dielectric laminated body is flexible, and the dielectric substrate is rigid.
1. An antenna comprising:
a dielectric laminated body including a plurality of dielectric layers being laminated;
a dielectric substrate bonded to one of surfaces of the dielectric laminated body; and
a radiation element pattern layer, a conductive ground layer, and a conductive pattern layer each formed in a different place in any of both the surfaces and between the dielectric layers of the dielectric laminated body, wherein
the radiation element pattern layer, the conductive ground layer, and the conductive pattern layer are formed in an order of the radiation element pattern layer, the conductive ground layer, and the conductive pattern layer from a dielectric substrate side toward an opposite side, and
the radiation element pattern layer includes one or more radiation elements, the conductive pattern layer includes a feed line configured to feed power to the radiation elements, the dielectric laminated body is flexible, and the dielectric substrate is rigid.
2. The antenna according to claim 1 , further comprising
a parasitic element pattern layer formed on a surface of the dielectric laminated body located between the dielectric substrate and the radiation element pattern layer, or formed between layers of the dielectric laminated body located between the dielectric substrate and the radiation element pattern layer, wherein
the parasitic element pattern layer includes a parasitic element in at least one position facing the radiation element.
3. The antenna according to claim 2 , wherein
a central part of the parasitic element overlaps a central part of the radiation element in a plan view, and a length of the parasitic element in a polarization direction is shorter than a length of the radiation element in the polarization direction.
4. The antenna according to claim 3 , wherein
a length of the parasitic element in the polarization direction is 70 to 95% of a length of the radiation element in the polarization direction.
5. The antenna according to claim 2 , further comprising
an adhesive layer of a dielectric configured to adhere the dielectric laminated body and the dielectric substrate, wherein
the parasitic element is formed on a surface of the dielectric laminated body in the adhesive layer, and the adhesive layer is thicker than the parasitic element and is thinner than the dielectric substrate.
6. The antenna according to claim 1 , further comprising
a parasitic element pattern layer formed between layers of the dielectric laminated body between the radiation element pattern layer and the conductive ground layer, wherein
the parasitic element pattern layer includes a parasitic element in at least one position facing the radiation element.
7. The antenna according to claim 6 , wherein
a central part of the parasitic element overlaps a central part of the radiation element in a plan view, and a length of the radiation element in a polarization direction is shorter than a length of the parasitic element in the polarization direction.
8. The antenna according to claim 6 , further comprising
an adhesive layer of a dielectric configured to adhere the dielectric laminated body and the dielectric substrate, wherein
the radiation element is formed on a surface of the dielectric laminated body in the adhesive layer, and the adhesive layer is thicker than the radiation element and is thinner than the dielectric substrate.
9. The antenna according to claim 1 , wherein
a thickness of the dielectric substrate is 300 to 700 μm.
10. The antenna according to claim 1 , wherein
a thickness of the dielectric laminated body is equal to or less than 300 μm.
11. The antenna according to claim 1 , wherein
four, six, or eight of the radiation elements are linearly aligned at intervals and connected in series, and
the feed line feeds power to the center of a row of the radiation elements.
12. The antenna according to claim 11 , wherein
two rows of the radiation elements are linearly arranged in line, and one of the radiation element rows has a shape that is line symmetric or point symmetric with a shape of another of the radiation element rows, or has a shape obtained by translating the another radiation element row.
13. The antenna according to claim 11 , wherein
a plurality of the radiation element rows are aligned at a predetermined pitch in a direction orthogonal to a direction of the radiation element rows, and radiation elements positioned in the same order in the radiation element rows are aligned in line in the orthogonal direction.
14. The antenna according to claim 13 , wherein
the predetermined pitch is 0.4 to 0.6 times a wavelength at the highest frequency to be used.
15. The antenna according to claim 13 , wherein
a plurality of groups each including a plurality of the radiation element rows aligned at the predetermined pitch in the direction orthogonal to the direction of the radiation element rows are located, and row directions of the radiation element rows in all of the groups are parallel to each other.