US-20260128506-A1 - ANTENNA DEVICE

Abstract

An antenna device which includes a plurality of antennas in a common case and is capable of achieving downsizing while suppressing a decrease of an antenna gain, is provided. An antenna device includes a TEL antenna and a capacity loaded element in a common case. The capacity loaded element is located above the TEL antenna. A length of the capacity loaded element is a positive integer multiple of one-half a wavelength of a PCS band. The TEL antenna is arranged so as to avoid a voltage maximum point of a standing wave, of the PCS band, generated in the capacity loaded element.

Inventors

• Noritaka TERASHITA
• Motohisa ONO

Assignees

• YOKOWO CO., LTD.

Dates

Publication Date

20260507

Application Date

20251229

Claims (19)

1. 1 . An antenna device comprising: two satellite antennas configured to at least receive signals in different frequency bands; an antenna element configured to at least transmit or receive a signal in a frequency band different from the frequency bands of the signals which the two satellite antennas receive; and a connector configured to transfer the signals of the two satellite antennas and the signal of the antenna element, wherein the two satellite antennas and the antenna element are arranged in order of the two satellite antennas and the antenna element from a front side toward a rear side of a vehicle, and wherein the connector is disposed between the two satellite antennas and the antenna element.
2. 2 . The antenna device according to claim 1 , wherein the signals which the two satellite antennas receive include at least a GPS signal.
3. 3 . The antenna device according to claim 1 , wherein the antenna element is a TEL antenna, a DAB antenna, an FM antenna, an inter-vehicle communication antenna, a WiFi antenna, a TV antenna or a keyless entry antenna.
4. 4 . The antenna device according to claim 1 , wherein the two satellite antennas are an XM antenna and a GPS antenna, and the connector is disposed between the GPS antenna and the antenna element.
5. 5 . The antenna device according to claim 1 , wherein a power feeding position of the antenna element is close to the connector.
6. 6 . The antenna device according to claim 1 , wherein a power feeding position of the antenna element is positioned at the rear side of the vehicle with respect to a position of the connector.
7. 7 . The antenna device according to claim 1 , further comprising: an amplifier substrate, wherein the connector is provided on a lower surface of the amplifier substrate.
8. 8 . The antenna device according to claim 7 , further comprising: a base attached to the amplifier substrate, wherein the connector is projected from a hole formed in the base.
9. 9 . The antenna device according to claim 8 , wherein the base includes an attachment portion configured to be attached to the vehicle, and the connector is a separate body from the attachment portion.
10. 10 . An antenna device comprising: a first satellite antenna configured to receive a signal of a first frequency band; a first antenna element configured to at least transmit or receive a signal of a second frequency band different from the first frequency band; and a connector configured to transfer the signal of the first satellite antenna and the signal of the first antenna element, wherein the first satellite antenna and the first antenna element are arranged in an order of the first satellite antenna and the first antenna element from a front side toward a rear side of a vehicle, and wherein the connector is disposed between the first satellite antenna and the first antenna element.
11. 11 . The antenna device according to claim 10 , wherein the first antenna element is a TEL antenna, a DAB antenna, a FM antenna, an inter-vehicle communication antenna, a WiFi antenna, a TV antenna or a keyless entry antenna.
12. 12 . The antenna device according to claim 10 , wherein the signal which the first satellite antenna receive includes at least a GPS signal.
13. 13 . The antenna device according to claim 10 , further comprising: an amplifier substrate, wherein the connector is provided on a lower surface of the amplifier substrate.
14. 14 . The antenna device according to claim 13 , further comprising: a base attached to the amplifier substrate, wherein the connector is projected from a hole formed in the base.
15. 15 . The antenna device according to claim 14 , wherein the base includes an attachment portion configured to be attached to the vehicle, and the connector is a separate body from the attachment portion.
16. 16 . The antenna device according to claim 14 , wherein the first satellite antenna and the first antenna element are disposed on the base.
17. 17 . The antenna device according to claim 10 , wherein a power feeding position of the first antenna element is close to the connector.
18. 18 . The antenna device according to claim 10 , wherein a power feeding position of the first antenna element is positioned at the rear side of the vehicle with respect to a position of the connector.
19. 19 . The antenna device according to claim 10 , further comprising: a second satellite antenna, wherein the second satellite antenna is positioned at the front side of the vehicle with respect to the first satellite antenna.

Description

TECHNICAL FIELD The present invention relates to an antenna device including two or more antennas within a common case. BACKGROUND ART In recent years, a vehicle-mounted antenna device called a shark fin antenna has been developed. There is a tendency that an information communication system antenna such as a TEL antenna is installed in the vehicle-mounted antenna in addition to a broadcast system receiving antenna such as an AM/FM antenna (for example, Patent Document 1). PRIOR ART DOCUMENTS Patent Documents Patent Document 1: JP-A-2012-124714 SUMMARY OF THE INVENTION Problems to be Solved by the Invention When a plurality of antennas is provided within a limited space in a case, it is a problem that a distance between the antennas cannot be sufficiently maintained and a gain of the antenna is decreased. On the other hand, when a distance between antennas is increased inside a case, it is a problem that the case becomes large and cannot be downsized. The present invention has been achieved in view of such circumstances, and an object of the present invention is to provide an antenna device which includes a plurality of antennas within a common case and which can be downsized while suppressing a decrease of an antenna gain. Means for Solving the Problems An aspect of the present invention is an antenna device. The antenna device includes first and second antennas provided in a common case, and the second antenna has a plate shape and is located above the first antenna, andthe first antenna is arranged so as to avoid a voltage maximum point of a standing wave, of a frequency band of the first antenna, generated in the second antenna. The first antenna may be located or extend in a range in which a horizontal distance from a voltage minimum point of the standing wave generated in the second antenna is set within one-eighth a wavelength of the standing wave. The second antenna may have a first plate-shaped part located above the first antenna, and the first antenna may be located below a center part of the first plate-shaped part, anda length of the first plate-shaped part may be an odd multiple of one-half a wavelength of the frequency band of the first antenna. The second antenna may have the first plate-shaped part located above the first antenna, and a second plate-shaped part electrically connected to the first plate-shaped part through a filter part that cuts off the frequency band of the first antenna. The second antenna may have a first plate-shaped part located above the first antenna, and a second plate-shaped part electrically connected to the first plate-shaped part through a meander line. The first plate-shaped part and the second plate-shaped part may be arranged with the first plate-shaped part separated from the second plate-shaped part in a front-rear direction. In the second antenna, at least a portion located above the first antenna may be divided in a right-left direction. A helical element electrically connected to the second antenna may be included. The helical element may be wound helically and elliptically when viewed from a winding axis direction of the helical element. A base that defines a storage space of the first and second antennas together with the case may be included, and the first antenna may have a portion substantially vertical to the base. The first antenna may be a TEL antenna, a TV antenna, a keyless entry antenna, an inter-vehicle communication antenna or a WiFi antenna, and the second antenna may be an AM/FM antenna or a DAB receiving antenna. A helical element electrically connected to the second antenna may be included, and the helical element may be arranged in a state shifted from a center of the case, in the right-left direction, for holding the second antenna. A winding axis of the helical element may be obliquely inclined to an upward-downward direction. A position of the helical element in the upward-downward direction may be constructed so as not to overlap with the second antenna. The antenna device may include a holder for holding the helical element, and the holder may hold the helical element from an outer peripheral side or an inner peripheral side. The holder may have a groove for holding the helical element. The base may have a step on a lower surface. The helical element may have a first helical element, and a second helical element grounded through the filter part that cuts off the frequency band of the first antenna. The antenna device may include a conductor plate spring for pinching the first antenna, and the conductor plate spring or a portion of the first antenna pinched by the conductor plate spring may have a protrusion. The antenna device may include a third antenna provided inside the case, and an upward portion of the third antenna may be covered with a parasitic element. A second filter part for increasing an impedance of a TEL band may be provided between the first helical element and an amplifier for amplifying a frequency of the second a