JPH09307326A - Contactless antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the loss due to spatial coupling and to attain efficient radiation or reception of a radio wave by configuring the contactless antenna with a dielectric cylindrical resonator having a hollow in a direction perpendicular to a radial direction, an antenna element inserted to the hollow, and a lead wire at the outer side of the resonator and connected electrically to a transmission reception circuit. SOLUTION: The contactless retractable antenna system used for a portable radio equipment is made up of a dielectric resonator 1, a lead wire 7, and an antenna element 2. The dielectric resonator 1 has a hollow part 1a in a direction perpendicularly to a radial direction. The lead wire 7 is provided to an outer side of the dielectric resonator 1 and connected electrically to a transmission reception circuit 3. The antenna element 2 is inserted into the hollow part 1a of the dielectric resonator 1. The transmission reception of a radio wave is conducted by spatial coupling between the dielectric resonator 1 and the antenna element 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type antenna device used in a mobile wireless device such as a mobile phone.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing a conventional non-contact type telescopic antenna. In the figure, a portable wireless device 4 has a transmission / reception circuit 3, a strip line 5 electrically connected to the transmission / reception circuit 3, and an antenna element 2 that expands and contracts without contact with the strip line 5.

Next, the operation will be described. When transmitting the radio wave, the radio wave is transmitted from the transmission / reception circuit 3 to the strip line 5
Are supplied to the antenna element 2 and are spatially coupled between the antenna element 2 and the strip line 5, so that a radio wave can be emitted from the antenna element 2 into the space.

When receiving a radio wave, the antenna element 2 receives the radio wave from the space, and the antenna element 2 and the strip line 5 are spatially coupled to each other, so that the received radio wave is supplied to the transmission / reception circuit 3.

[0005]

Since the conventional non-contact type telescopic antenna is constructed as described above, the radio wave is emitted even in the directions other than the coupling of the strip line 5 and the antenna element 2 in the space. There were problems such as radiating and picking up noise from the surroundings.

The present invention has been made to solve the above-mentioned problems, and can enhance the spatial coupling between the antenna element and the strip line and radiate radio waves in unnecessary directions. Without doing
An object is to obtain a non-contact type antenna device that does not pick up ambient noise.

[0007]

A non-contact type antenna device according to the invention of claim 1 has a cylindrical dielectric resonator having a hollow portion in a direction perpendicular to a radial direction, and an outer surface of the dielectric resonator. It is characterized in that it is provided with a conductor portion provided and electrically connected to the transmission / reception circuit, and an antenna element inserted into the hollow portion of the dielectric resonator.

A non-contact type antenna device according to a second aspect of the present invention is the non-contact type antenna device according to the first aspect,
The conductor portion is characterized in that it is formed long in the direction perpendicular to the radial direction.

A non-contact type antenna device according to a third aspect of the present invention is the non-contact type antenna device according to the first aspect,
It is characterized in that the outside of the dielectric resonator is covered with a metal film, and the metal film serves as a conductor portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a configuration diagram of a non-contact telescopic antenna according to Embodiment 1 of the present invention. In the figure, 1 is a cylindrical dielectric resonator having a hollow portion 1a in a direction perpendicular to the radial direction, 2 is an extendable antenna element inserted in the hollow portion 1a, 3 is a transmitting / receiving circuit, and the dielectric material is It is electrically connected to a long conductor wire 7 provided on the outer surface of the resonator 1 in a direction perpendicular to the radial direction. Reference numeral 4 denotes a portable wireless device that accommodates these components.

Next, the operation will be described. When transmitting a radio wave, the radio wave is supplied from the transmission / reception circuit 3 to the dielectric resonator 1 through the lead wire 7, and the antenna element 2 and the dielectric resonator 1 are spatially coupled to each other so that the antenna element 2 can Radio waves can be emitted into space.

When receiving a radio wave, the antenna element 2 receives the radio wave from the space, and the antenna element 2 and the dielectric resonator 1 are spatially coupled, so that the received radio wave is transmitted from the conductor 7 to the transmission / reception circuit 3. Supplied.

The dielectric resonator 1 used at this time has a high degree of coupling. Further, by using the cylindrical dielectric resonator 1, the coupling becomes dense and the transmitting / receiving circuit 3 and the antenna element 2 are connected. The radio energy can be efficiently supplied when viewed between the two. As a result, it is possible to reduce the loss during energy transmission.

Embodiment 2 FIG. Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. 2 is a configuration diagram of a non-contact telescopic antenna according to Embodiment 2 of the present invention. In the first embodiment, the conductor 7 is formed on the outer surface of the cylindrical dielectric resonator 1.
Although the one provided with is described, as shown in FIG.
The outer side of the cylindrical dielectric resonator 1 may be covered with the metal film 6, and the shield effect can be expected more than in the first embodiment.

That is, the electromagnetic field to the outside of the cylinder is cut off by the shield effect, and the distribution of the electromagnetic field exists only inside the cylinder. In this case, it is possible to achieve spatial coupling only between the dielectric resonator 1 and the antenna element 2.

The purpose here is to prevent unnecessary radiation to other than the antenna element 2 at the time of transmission, and to prevent noise from being received from other than the antenna element 2 at the time of reception. That is, there is a shield effect.

In the above embodiment, the dielectric resonator 1 is provided with the long conducting wire 7 on the outer surface in the direction perpendicular to the radial direction,
Also, although the outer side of the dielectric resonator 1 is covered with the metal film 6, the conductor provided on the outer surface of the dielectric resonator 1 is not limited to this and may have another shape.

Further, although the antenna element 2 is shown as a telescopic type, it may be a fixed type.

[0019]

The non-contact type antenna device according to the invention of claim 1 is provided with a cylindrical dielectric resonator having a hollow portion in a direction perpendicular to the radial direction, and is provided on the outer surface of the dielectric resonator to transmit / receive signals. Equipped with a conductor electrically connected to the circuit and an antenna element inserted into the hollow portion of the dielectric resonator, the electromagnetic energy is efficiently supplied when viewed between the transmission / reception circuit and the antenna element. can do.

A non-contact type antenna device according to a second aspect of the present invention is the non-contact type antenna device according to the first aspect,
Since the conductor portion is formed long in the direction perpendicular to the radial direction, the electromagnetic energy can be supplied more efficiently.

A non-contact type antenna device according to a third aspect of the present invention is the non-contact type antenna device according to the first aspect,
Since the outside of the dielectric resonator is covered with a metal film and the metal film is used as a conductor, unnecessary radiation to other than the antenna element can be prevented during transmission, and noise from other than the antenna element during reception can be received. Can be prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a non-contact telescopic antenna according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a non-contact telescopic antenna according to Embodiment 2 of the present invention.

FIG. 3 is a perspective view showing a conventional non-contact type telescopic antenna.

[Explanation of symbols]

1 Dielectric Resonator, 2 Antenna Element, 3 Transmitter / Receiver Circuit, 4 Portable Radio Device, 5 Stripline, 6
Metal film, 7 conductors.

Claims (3)

[Claims] 1. A cylindrical dielectric resonator having a hollow portion in a direction perpendicular to a radial direction, a conductor portion provided on an outer surface of the dielectric resonator and electrically connected to a transmission / reception circuit, A non-contact type antenna device comprising: an antenna element that is inserted into a hollow portion of a dielectric resonator. 2. The non-contact type antenna device according to claim 1, wherein the conductor portion is formed to be long in a direction perpendicular to the radial direction. 3. A metal film covers the outside of the dielectric resonator,
The metal film is used as a conductor portion.
The non-contact type antenna device described.