Antenna and electronic device

Patent metadata

Field	Value
Publication number	US-12438280-B2
Application number	US-202118042496-A
Country	US
Kind code	B2
Filing date	Aug 17, 2021
Priority date	Sep 2, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A small-sized normal mode helical antenna is provided that is not affected by nearby conductors. The antenna is an antenna including a coil constituting a normal mode helical antenna, an area of a cross section perpendicular to an axis of the coil for a single turn at each end of the coil being less than an area of a cross section perpendicular to the axis of the coil near the coil center.

First claim

The invention claimed is:

1. An antenna, comprising:
a first coil constituting a normal mode helical antenna, wherein
a first cross-sectional area of the first coil is less than a second cross-sectional area of the first coil, for a single turn of the first coil,
the first cross-sectional area is perpendicular to an axis of the first coil at each end of the first coil, and
the second cross-sectional area is perpendicular to the axis of the first coil near a center of the first coil; and

a first impedance matching mechanism attached with the first coil, wherein the first impedance matching mechanism includes a feeding tap, and both ends of the feeding tap are short-circuited to the first coil.

2. The antenna according to claim 1 , further includes a feeding point near the center of the first coil.

3. The antenna according to claim 2 , further comprising:
at least two coils including the first coil, and
a second impedance matching mechanism in which both ends of the first coil are short-circuited to both ends of a second coil of the at least two coils.

4. The antenna according to claim 3 , wherein
the second coil without the feeding point is thicker than the first coil to which the feeding point is connected.

5. The antenna according to claim 1 , wherein
the second cross-sectional area monotonously decreases from near the center of the first coil toward both opposite ends of the first coil.

6. The antenna according to claim 1 , wherein
a pitch of the first coil is variable.

7. The antenna according to claim 1 , wherein
a shape projected on a cross section of the first cross-sectional area and the second cross-sectional area of the first coil is a convex shape.

8. The antenna according to claim 1 , further comprising at least two coils including the first coil, wherein the at least two coils have substantially equal shapes,
the at least two coils are in a plane symmetry, and
the antenna is configured such that both ends of each of the at least two coils are short-circuited.

9. The antenna according to claim 1 , comprising:
a plurality of patterns on both surfaces of a dielectric material, and
a plurality of through holes which penetrates the dielectric material, wherein
the first coil is structured by a connection of the plurality of patterns on the both surfaces of the dielectric material via the plurality of through holes.

10. The antenna according to claim 1 , wherein
the first coil is structured by a pattern on a surface of a dielectric material.

11. The antenna according to claim 1 , wherein
the first coil includes a magnetic material, and
a shape of the first coil is based on a good conductor which is around the magnetic material.

12. The antenna according to claim 1 , further comprising a good conductor at a position substantially parallel to the axis of the first coil.

13. An electronic device, comprising:
an antenna which includes:
a coil constituting a normal mode helical antenna, wherein
a first cross-sectional area of the coil is less than a second cross-sectional area of the coil, for a single turn of the coil,
the first cross-sectional area is perpendicular to an axis of the coil at each end of the coil,
the second cross-sectional area is perpendicular to the axis of the coil near a center of the coil,
the axis of the coil is substantially parallel to at least one of a metal part in the electronic device or a human body, and
the antenna is worn by the human body; and

a first impedance matching mechanism attached with the coil, wherein
the first impedance matching mechanism includes a feeding tap, and
both ends of the feeding tap are short-circuited to the coil.

Assignees

• Sony Group Corp

Inventors

• Kaneko Yukio
• Kawamura Takashi
• Ikeda Tetsuo

Classifications

• H01Q1/362

  for broadside radiating helical antennas · CPC title

• H01Q1/24

  with receiving set · CPC title

• H01Q21/06

  Arrays of individually energised antenna units similarly polarised and spaced apart · CPC title

• H01Q21/28

  Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)} · CPC title

• H01Q1/273

  Adaptation for carrying or wearing by persons or animals · CPC title