JP2000031719A - Antenna system for small sized receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable loop antenna with a high gain for both vertically and horizontally polarized waves by allowing an antenna directive characteristic of a portable small sized receiver or the like to have omni-directivity. SOLUTION: Relating to a loop antenna used for a portable small sized receiver 2 or the like, in the case that the small sized receiver 2 or the like is contained in a portable container case, there is a restriction in a receptible polarized wave plane depending on its direction. A contactless loop antenna is built in the portable container case in addition to the loop antenna connecting to the portable small sized receiver 2 or the like, and the contactless loop antenna is built in the portable container case and the loop antenna 3 built in the portable container case are coupled by mutual inductance to improve the antenna directivity characteristic. Even when the portable small sized receiver 2 or the like is built in a hard case, the high gain loop antenna 3 with stability and a high gain is realized for both vertically and horizontally polarized wave planes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a small receiver, and more particularly to a loop antenna built in a small receiver portable storage case.

[0002]

2. Description of the Related Art Conventionally, loop antennas for small receivers are:
JP-A-52-102654, JP-A-52-127047, and JP-A-56-32803 are known. 2. Description of the Related Art Small portable receivers, especially individually selected paging receivers such as pagers, have been miniaturized for users to carry and use. As an antenna used for such a receiver, a built-in loop antenna having a high gain and improving the antenna gain when worn on a human body is often used. When carrying a small receiver, a portable external storage case for wearing on a waist belt is often used. A portable external storage case is designed so that a loop antenna built in a small receiver or the like has a directional characteristic and matches the polarization plane of a radio wave transmitted from a base station. For example, in the case of a pager, since the transmission wave from the base station is vertically polarized, when the portable external storage case is installed, the polarization plane of the loop antenna built in the receiver is designed to be also vertically polarized. I have.

[0003]

In the above-described conventional loop antenna device, a portable external storage case for a waist belt is often used for carrying a small receiver, and is used by being mounted at a waist position. However, when a small receiver is mounted in the portable external storage case, there is a restriction on a polarization plane that can be received by a loop antenna built in the small receiver depending on a direction in which the small receiver is carried.

For example, when a transmission wave from a base station has a vertical polarization plane, a high gain can be obtained if the polarization plane of a small receiver mounted in a portable external storage case is a vertical polarization plane. If the polarization plane of the receiver is a horizontal polarization plane, the antenna gain is reduced. In addition, the transmission wave from the base station is a vertical polarization plane, even if the polarization plane of the small receiver is a vertical polarization plane, the polarization plane changes due to reflection, diffraction, etc. before reaching the receiver, When the arriving wave has a horizontal plane of polarization, there is a problem that the antenna gain cannot be sufficiently obtained.

The present invention solves the above-mentioned conventional problems. Even when a small-sized receiver is mounted in a portable external storage case, a high directional characteristic can be obtained with respect to both vertical and horizontal polarization planes. An object of the present invention is to make an antenna directional characteristic non-directional by a loop antenna device having a gain.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a small receiver is provided inside a portable storage case or a receiver housing separately from a loop antenna built in the receiver. A contact or non-contact type antenna is provided, and the loop antenna with the built-in receiver is connected to the antenna inside the portable storage case or the receiver housing by coupling the loop antenna with the built-in receiver to the antenna inside the portable storage case or the receiver housing. The built-in antenna is integrated.

[0007] With this configuration, no matter which direction the small receiver is stored in the portable storage case, a high antenna having a stable antenna directivity with respect to both the vertical and horizontal polarization planes of the arriving wave. A loop antenna having a high gain can be obtained, and the antenna can be made non-directional.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a non-contact loop antenna built in a portable storage case of a small receiver, a small receiver built-in loop antenna, and the non-contact loop antenna. And a means for coupling the antennas by mutual induction, and has an effect of providing a stable directional characteristic with respect to both horizontal and vertical polarization planes of the arriving wave.

[0009] The invention described in claim 2 of the present invention is claim 1.
In the antenna device for a small receiver according to the above, an electrical contact for forming a loop antenna is provided at a stopper portion of the portable storage case, so that the receiver can be easily taken in and out of the portable storage case. In addition, it has the effect of increasing the degree of freedom in the design of the portable storage case.

The third aspect of the present invention is the first aspect of the present invention.
In the antenna device for a small receiver according to the above, a part for the purpose of electrical contact for forming a loop antenna is provided at a fulcrum for opening and closing the portable storage case, and is incorporated in the portable storage case. Has the effect of reducing the bending stress applied to the antenna material.

According to a fourth aspect of the present invention, a non-contact type antenna provided inside a housing of the small receiver is coupled to the non-contact antenna separately from a loop antenna built in the small receiver by mutual induction. And an antenna device for a small receiver, which has a function of changing the antenna polarization plane.

According to a fifth aspect of the present invention, there is provided an antenna apparatus for a small receiver, wherein a contact antenna is provided inside a housing of the small receiver, separately from a loop antenna built in the small receiver. And has the effect of changing the antenna polarization plane.

According to a sixth aspect of the present invention, there is provided a small-sized receiver having a contact-type antenna provided inside a portable storage case of the small-sized receiver separately from a loop antenna built in the small-sized receiver. Antenna device having the effect of changing the antenna polarization plane.

[0014] The invention according to claim 7 of the present invention is an antenna device for a small receiver provided with a plurality of antennas corresponding to a plurality of polarization planes inside the housing of the small receiver. It has the effect of enabling reception.

According to an eighth aspect of the present invention, there is provided a small-sized receiver provided with a plurality of antennas corresponding to a plurality of polarization planes inside a portable storage case, separately from a loop antenna built in the small-sized receiver. Antenna device having an effect of enabling reception on a plurality of polarization planes.

According to a ninth aspect of the present invention, there is provided a loop antenna built in a small receiver, a second antenna provided in a portable storage case or a housing of the small receiver, and the loop antenna. And a coupling means for coupling the second antenna with the second antenna by contact or non-contact, and means for adjusting the coupling means for enhancing the directivity of the vertical polarization plane or the directivity of the horizontal polarization plane. The antenna device has an effect of making the antenna non-directional.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(First Embodiment) A first embodiment of the present invention relates to a small receiver in which a loop antenna with a built-in small receiver and a loop antenna provided in a portable storage case are connected in a non-contact manner. Antenna device.

FIG. 1 is an explanatory view of the antenna device for a small receiver according to the first embodiment of the present invention, and is a diagram of a loop antenna provided in a portable storage case used for the small receiver. In FIG. 1, reference numeral 1 denotes a base station that transmits a radio signal to a receiver. Reference numeral 2 denotes a receiver, which includes a loop antenna 3 for receiving a signal radiated from the base station 1 as a radio wave. In FIG. 2, reference numeral 4 denotes a small receiver 2
Is a portable storage case for carrying a portable receiver, and has a small antenna and a non-contact loop antenna 5 separately from the loop antenna 3 built in the receiver.

FIG. 3 is an explanatory diagram of the antenna device for a small receiver according to the first embodiment of the present invention, and is a diagram of a loop antenna provided in a portable storage case used for the small receiver. 5 shows a receiver stored in a portable storage case having a small receiver and a non-contact loop antenna. In FIG. 3, reference numeral 3 denotes a loop antenna built in the receiver.

Antenna 5 formed in portable storage case
Forms a loop in the vertical direction with respect to the loop antenna 3 built in the receiver. Since both loop antennas are coupled by mutual induction, a loop antenna device having high gain for both horizontal and vertical polarization planes can be realized.

As described above, in the first embodiment of the present invention, the antenna device for a small receiver is provided by a non-contact type loop antenna with a built-in small receiver and a loop antenna provided in a portable storage case. Because of the coupling configuration, a loop antenna with high gain for both horizontal and vertical polarization planes can be obtained.

(Second Embodiment) A second embodiment of the present invention is an antenna device for a small receiver in which electrical contacts are provided on stopper portions of a portable storage case to form a loop antenna.

FIG. 4 is an explanatory view of an antenna device for a small receiver according to a second embodiment of the present invention, and is a diagram of a loop antenna provided in a portable storage case used for the small receiver. It is a figure of the portable storage case which has the structure which forms the electrical contact for forming a loop antenna in the stopper part of the portable storage case. In FIG. 4, 4
Is a portable storage case for carrying the receiver.
Reference numeral 5 denotes a loop antenna built in the portable storage case. 6 is a stopper having an electric contact.

Loop antenna 5 with built-in portable storage case
, A loop antenna is formed by using the electrical contacts of the stopper 6. As shown in FIG. 4, when the stopper 6 is closed, the loop of the loop antenna 5 built in the portable storage case is closed by the electrical contact of the stopper 6. As shown in FIG. 5, when the stopper 6 is opened, the loop antenna 5 built in the portable storage case is used.
Loop is opened. Further, as shown in FIG. 6, by removing the stopper 6 and opening the case, the loop of the loop antenna built in the portable storage case is temporarily cut, and the portable storage case can be opened and closed. It is easy to take out the receiver from the receiver.

As described above, in the second embodiment of the present invention, the antenna device for the small receiver is configured such that the electrical contact is provided on the stopper portion of the portable storage case to form a loop antenna. The receiver can be easily removed from the portable storage case.

(Third Embodiment) A third embodiment of the present invention is directed to a small-sized receiver having a loop antenna by providing a movable electric connecting part at a fulcrum for opening and closing a portable storage case. An antenna device.

FIG. 7 is an explanatory view of an antenna device for a small receiver according to a third embodiment of the present invention, and is a diagram of a loop antenna provided in a portable storage case used for the small receiver. It is a figure of the portable storage case which has the structure which forms an electrical contact for forming a loop antenna in the opening / closing fulcrum part of a portable storage case, or a loop antenna using a movable electric connection part.

In FIG. 7, reference numeral 3 denotes a loop antenna built in the receiver. Reference numeral 4 denotes a portable storage case for carrying the receiver. 6 is a stopper having an electric contact. Reference numeral 7 denotes an opening / closing fulcrum having an electric contact, and using the opening / closing fulcrum 7 having an electric contact,
A portable storage case built-in loop antenna is formed.

By making the fulcrum for opening and closing the antenna an electrical contact, it is possible to reduce the bending stress applied to the antenna material when the portable storage case is opened as shown in FIG. The same effect can be obtained by using a movable electrical connection component such as a metal spring or a flexible substrate instead of the electrical contact 7 at the opening / closing fulcrum in FIGS.

As described above, in the third embodiment of the present invention, a small-sized receiver antenna device is provided with a movable electric connection component at a fulcrum for opening and closing a portable storage case to form a loop antenna. With this configuration, the bending stress applied to the antenna material when the portable storage case is opened can be reduced.

(Fourth Embodiment) A fourth embodiment of the present invention is an antenna device for a small receiver in which a non-contact type antenna is formed inside the housing of the small receiver.

FIG. 9 is an explanatory view of an antenna device for a small receiver according to a fourth embodiment of the present invention, and is a perspective view of a non-contact type antenna formed inside a small receiver housing.

Since the loop antenna 3 with a built-in small receiver is mutually coupled to a non-contact type antenna 8 formed inside the housing of the small receiver, an antenna device capable of changing the antenna polarization plane is realized. it can.

As described above, in the fourth embodiment of the present invention, the antenna device for a small receiver has a configuration in which a non-contact antenna is formed inside the housing of the small receiver. Can be changed.

(Fifth Embodiment) A fifth embodiment of the present invention is an antenna device for a small receiver in which a contact antenna is formed inside the housing of the small receiver.

FIG. 10 is an explanatory diagram of a small receiver antenna device according to a fifth embodiment of the present invention, and is a perspective view of a contact antenna formed inside a small receiver housing.

Since the small receiver built-in loop antenna 3 is coupled to the contact antenna 9 formed inside the small receiver housing, an antenna device capable of changing the antenna polarization plane can be realized.

As described above, in the fifth embodiment of the present invention, the antenna device for a small receiver is configured such that the contact antenna is formed inside the housing of the small receiver. Can be changed.

(Sixth Embodiment) A sixth embodiment of the present invention is an antenna device for a small receiver in which a contact type antenna is formed in a portable storage case.

FIG. 11 is an explanatory view of an antenna device for a small receiver according to a sixth embodiment of the present invention, and is a perspective view of a contact antenna formed outside the small receiver.

Since the loop antenna 3 with a built-in small receiver is connected to the contact antenna 9 formed in the portable storage case, an antenna device capable of changing the antenna polarization plane can be realized.

As described above, in the sixth embodiment of the present invention, the antenna device for a small receiver has a configuration in which a contact-type antenna is formed in a portable storage case. it can.

(Seventh Embodiment) A seventh embodiment of the present invention is an antenna device for a small receiver in which a plurality of antennas are formed inside the housing of the small receiver.

FIG. 12 is an explanatory view of an antenna device for a small receiver according to a seventh embodiment of the present invention, and is a perspective view in which a plurality of antennas are formed inside a small receiver housing.

The loop antenna 3 with a built-in small receiver is connected to a plurality of antenna elements 10 formed inside the small receiver housing, so that an antenna device capable of receiving a plurality of antenna polarization planes can be realized.

As described above, in the seventh embodiment of the present invention, the antenna device for a small receiver has a configuration in which a plurality of antennas are formed inside the housing of the small receiver. Can be received.

(Eighth Embodiment) An eighth embodiment of the present invention is an antenna device for a small receiver in which a plurality of non-contact type loop antennas are formed in a portable storage case.

FIG. 13 is an explanatory view of an antenna device for a small receiver according to an eighth embodiment of the present invention. FIG. 13 is a perspective view of a plurality of loop antennas provided in a portable storage case used for the small receiver. It is.

The loop antenna with a built-in small receiver is mutually coupled to a plurality of loop antennas 11 formed in a portable storage case, thereby realizing an antenna device capable of receiving a plurality of antenna polarization planes.

As described above, in the eighth embodiment of the present invention, the antenna device for a small receiver has a configuration in which a plurality of non-contact type loop antennas are formed in a portable storage case. Can receive waves.

[0052]

As described above, according to the present invention, a non-contact or contact type antenna is formed in a small receiver antenna inside a portable storage case or a small receiver housing. In addition, since the receiver's built-in loop antenna and the antenna inside the portable storage case or the receiver housing are integrated, it is possible to have stable antenna directivity characteristics even for incoming waves with various polarization planes. It is possible to obtain a high gain regardless of the direction in which the small receiver is stored in the portable storage case.

[Brief description of the drawings]

FIG. 1 is a receiver built-in loop antenna of a small receiver antenna device according to a first embodiment of the present invention;

FIG. 2 is a loop antenna provided in a portable storage case of the antenna device for a small receiver according to the first embodiment of the present invention;

FIG. 3 is a diagram of a portable storage case having a non-contact type loop antenna and a stored receiver of the antenna device for a small receiver according to the first embodiment of the present invention;

FIG. 4 is a portable storage case having a loop antenna of the antenna device for a small receiver according to the second embodiment of the present invention;

FIG. 5 is a diagram showing a state in which a stopper of a portable storage case having a loop antenna of a small receiver antenna device according to a second embodiment of the present invention is opened.

FIG. 6 is a view showing a state in which a portable storage case having a loop antenna of a small receiver antenna device according to a second embodiment of the present invention is opened.

FIG. 7 is a portable storage case having a loop antenna of the antenna device for a small receiver according to the third embodiment of the present invention;

FIG. 8 is a view showing a state in which a portable storage case having a loop antenna of the antenna device for a small receiver according to the third embodiment of the present invention is opened.

FIG. 9 shows an antenna device for a small receiver according to a fourth embodiment of the present invention;

FIG. 10 shows an antenna device for a small receiver according to a fifth embodiment of the present invention;

FIG. 11 shows a small receiver antenna device according to a sixth embodiment of the present invention;

FIG. 12 shows a small receiver antenna device according to a seventh embodiment of the present invention;

FIG. 13 is an antenna device for a small receiver according to an eighth embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 base station 2 small receiver 3 receiver built-in loop antenna 4 portable storage case 5 portable storage case built-in loop antenna 6 portable storage case stopper with electrical contact 7 opening and closing of portable storage case with electrical contact Fulcrum part 8 non-contact type antenna 9 contact type antenna 10 plural antenna elements 11 plural loop antennas

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yuji Sato 2-five, Meido, Izumi-ku, Sendai-shi, Miyagi F-term in Matsushita Communication Sendai Laboratory Co., Ltd. 5J021 AA02 AA12 AB04 DA03 EA01 GA07 HA10 JA07 5J047 AA04 AB11 FC01 FD01

Claims (9)

[Claims] 1. A non-contact type loop antenna built in a portable storage case of a small receiver, and means for coupling the small receiver built-in loop antenna and the non-contact type loop antenna by mutual induction. Antenna device for a small receiver. 2. The antenna device for a small receiver according to claim 1, wherein an electrical contact for forming a loop antenna is provided at a stopper portion of the portable storage case. 3. The antenna for a small receiver according to claim 1, wherein a part for electrical contact for forming a loop antenna is provided at a fulcrum for opening and closing the portable storage case. apparatus. 4. A non-contact type antenna provided inside a housing of the small-sized receiver and means for coupling by mutual induction separately from a loop antenna built in the small-sized receiver. Antenna device for small receivers. 5. An antenna device for a small receiver, wherein a contact antenna is provided inside a housing of the small receiver, separately from a loop antenna built in the small receiver. 6. Apart from a loop antenna built in the small receiver, inside the portable storage case of the small receiver,
An antenna device for a small receiver, comprising a contact type antenna. 7. An antenna device for a small receiver, wherein a plurality of antennas corresponding to a plurality of polarization planes are provided inside a housing of the small receiver. 8. An antenna device for a small receiver, wherein a plurality of antennas corresponding to a plurality of polarization planes are provided inside a portable storage case separately from a loop antenna built in the small receiver. 9. A loop antenna built in a small receiver, a second antenna provided in a portable storage case or inside a housing of the small receiver, and a contact or non-contact between the loop antenna and the second antenna. An antenna device for a small-sized receiver, comprising: a coupling means for coupling by means of: and a means for adjusting the coupling means to enhance the directivity of the vertical polarization plane or the directivity of the horizontal polarization plane.