# US 10,770,796 B2 · Antenna device and method for manufacturing antenna device

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- Number: US 10,770,796 B2
- Document ID: US10770796B2
- Status: Granted
- Kind: B2
- Application number: 16/140,079
- Filed: 2018-09-24
- Published: 2020-03-26
- Granted: 2020-09-08
- Earliest claimed: 2018-09-24
- Assignees: Mitsumi Electric Co., Ltd.
- Applicants: Ryutaro Miura
- Inventors: Ryutaro Miura
- Web page: https://patentgrep.com/patent/US10770796B2

## CPC

- H01Q 1/3275: {mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk}
- H01Q 9/14: Length of element or elements adjustable (telescopic elements H01Q1/10)
- H01Q 1/32: Adaptation for use in or on road or rail vehicles
- H01Q 9/40: Element having extended radiating surface
- H01Q 23/00: Antennas with active circuits or circuit elements integrated within them or attached to them
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)

## Abstract

An antenna device mounted to an automobile includes an antenna component and an amplifier board provided with an amplifier to amplify signals received by the antenna component. The antenna component includes a metal plate and a resonance point adjusting coil having a first end connected to the metal plate, the resonance point adjusting coil being connected to an input terminal of the amplifier board at the first end via the metal plate. The impedance of the antenna component is adjustable by the mount angle of the resonance point adjusting coil to the antenna component.

## Claims

### Claim 1

A shark fin type antenna device mounted to an automobile, comprising:
an antenna component; and
an amplifier board provided with an amplifier to amplify signals received by the antenna component,
wherein the antenna component comprises a metal plate and a resonance point adjusting coil mounted to the metal plate, the resonance point adjusting coil having a first end connected to the metal plate and a second end that is open, and the resonance point adjusting coil being connected to an input terminal of the amplifier board at the first end via the metal plate,
wherein an impedance of the antenna component changes in accordance with a selection of a mount angle of the resonance point adjusting coil mounted to the metal plate, and
wherein the mount angle of the resonance point adjusting coil is fixed in the shark fin type antenna device after the selection of the mount angle such that the resonance point adjusting coil cannot be tiltably adjusted.

### Claim 2 (depends on 1)

The antenna device according to claim 1, wherein a direction from the first end of the resonance point adjusting coil to the second end along a central axis of the resonance point adjusting coil is vertically downward.

### Claim 3 (depends on 1)

The antenna device according to claim 1, wherein the resonance point adjusting coil is mounted at an angle of 90° where a mount angle of the resonance point adjusting coil is defined as 0° when a direction from the first end of the resonance point adjusting coil to the second end along a central axis of the resonance point adjusting coil is vertically downward.

### Claim 4 (depends on 1)

A method for manufacturing the antenna device according to claim 1, the method comprising:
adjusting the mount angle of the resonance point adjusting coil; and
adjusting a pitch and a number of windings and a length of a wire of the resonance point adjusting coil according to the mount angle to adjust the impedance of the antenna component to a desired level.