JPH07240696A - Small radio equipment - Google Patents

Abstract

PURPOSE:To realize a small radio equipment in which a high antenna gain is obtained even when the size of the radio equipment is very small with respect to the configuration of the small radio equipment attached to an animal or the like. CONSTITUTION:In the small radio equipment comprising a microstrip antenna, a radio equipment enclosure 4 containing the radio equipment, and an attaching member 5 made of a dielectric material used to attach the antenna onto a human body, an animal or the like. A ground section of the radio equipment enclosure 4 and a ground conductor of the microstrip antenna, and an antenna circuit of the radio equipment, and a radiation element 3, are connected to each other through a coaxial line, a feeding connector or a microstrip line, and a part of the whole part of the microstrip antenna is covered with a dielectric material to be integrated with the attaching member 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a small radio device, and more particularly, the size of the radio device housing is considerably smaller than the wavelength used, and it is used by being attached to animals or objects. Related to small radios.

[0002]

2. Description of the Related Art FIG. 16 is a block diagram of a conventional small radio which is mounted and used on a human body or an animal. Reference numeral 1 is a dielectric substrate, 2 is a ground conductor made of a metal film, 3 is an antenna radiating element made of a metal film deposited on the surface of the dielectric substrate 1, 4 is a radio housing, and 5 is attached to a human body or an animal. Mounting member made of a dielectric material, 6 is an outer conductor of the power feeding connector, 7 is an inner conductor of the power feeding connector, 8 is a string or a tape through hole for mounting on a human body or an animal, and 17 is provided on the antenna radiating element. A slot 18 is a notch formed in the antenna radiating element.

Usually, the element length of the radiating element 3 of the microstrip antenna requires a working wavelength (taking into consideration the dielectric constant of the dielectric substrate 2) and 1/4 or more, but the housing size is smaller than the working wavelength. If the antenna radiating element having the same size as the housing is mounted on the housing as it is, the resonance frequency becomes higher than the desired resonance frequency. Therefore, the slot 16 and the cut 1
By providing 7, the resonance frequency is lowered. FIG. 17 shows the radiation directivity of vertically polarized waves in the horizontal plane of such a conventional antenna, and is about −27.0 dBd.
(Dipole ratio) and gain are decreasing.

[0004]

As described above, when a microstrip antenna is mounted on a small radio having a radio housing whose housing size is very small compared to the wavelength used, it is necessary to make a cut or cut in the antenna radiating element. It is necessary to reduce the resonance frequency by providing the slot. But,
Notches or slots are provided in the antenna radiating element 3 and the radiation efficiency of the antenna is reduced, so that a high antenna gain cannot be obtained. For example, “literature: Ishida, Nakaoka, Ito:“ Transformed inverse F ”
Type Antenna Characteristics ", AP-86-74, pp.1-
According to "6." As a general tendency, the efficiency decreases as the resonance frequency decreases. In particular, the efficiency of the cut antenna is significantly lower than that of the resonance frequency. It shows that it is not desirable to reduce the resonance frequency. "

In view of such conventional problems, the present invention is easy to attach to an animal or an object, and it is not necessary to provide a cut or a slot in the antenna radiating element, so that a radiating element having a high antenna gain can be obtained. It is intended to realize a small radio device equipped with.

[0006]

According to the invention, the aforesaid problems are solved by the means defined in the claims. That is, the invention of claim 1 is a radio device comprising a microstrip antenna connected to at least one of a transmitter and a receiver directly or via a duplexer, and the transmitter or the receiver, or both of them. In a small radio including a radio housing for housing an antenna and a mounting member made of a dielectric material for mounting the antenna on a human body or an animal, a ground conductor of the radio housing and a ground conductor of a microstrip antenna. , And the antenna circuit of the radio device and the radiating element are connected via a coaxial line, a power supply connector or a microstrip line, and a part or all of the microstrip antenna is covered with a dielectric material and integrated with a mounting member. It is a miniaturized wireless device.

According to a second aspect of the present invention, in the first aspect of the invention, the radio housing is made of a conductive material, and at least a part of the radio housing is in contact with the ground conductor of the microstrip antenna. It is a small radio that is worn.

According to a third aspect of the invention, in the first aspect of the invention, the radio housing is made of a conductive material,
The radio casing is a small radio that is attached so as not to contact the ground conductor of the microstrip antenna.

According to a fourth aspect of the present invention, in the above-mentioned first to third aspects, the radio housing is attached to a dielectric plate forming a microstrip antenna or to a side surface of an edge portion of a mounting member. It is a small radio that consists of.

According to a fifth aspect of the present invention, in the above-mentioned first to fourth aspects of the invention, the microstrip antenna and the mounting member are formed so that the side surfaces or the cross section along the longitudinal direction thereof are curved. It is a machine.

The invention of claim 6 is the above claims 1 to 5.
In the invention, the microstrip antenna and the mounting member are small radios formed of a flexible material. According to a seventh aspect of the present invention, there is provided a radio device according to any one of the first to sixth aspects, and a small radio device in which a microstrip antenna is covered with a weather resistant dielectric film together with a mounting member.

[0012]

The miniature radio of the present invention is configured such that the microstrip antenna is integrated with a correspondingly sized mounting member made of a dielectric material for mounting the radio on an animal or an object. Therefore, since the length of the antenna radiating element can be set to about 1/4 or more of the used wavelength (in consideration of the dielectric constant of the dielectric substrate), the radiation efficiency of the antenna radiating element can be prevented from decreasing and the antenna can have a high gain. Can be

The small radio device of the present invention is also formed in a collar shape, and the microstrip antenna incorporated in the mounting member and the radio device are attached to the neck of an animal or the like, and the microstrip antenna and the radio device are coaxial. It can be configured to be connected by a track. In this way, the radio can be attached freely according to the body shape of the animal to which the radio is attached.

Further, when the microstrip antenna is viewed from a direction perpendicular to the dielectric substrate or the ground conductor, a part of the radio housing is configured to come into contact with or overlap an edge portion of the dielectric substrate or the ground conductor. As a result, the same effect as if the ground conductor of the microstrip antenna becomes equivalently large occurs, and the antenna gain can be improved.

Further, the mounting member having a curved surface or made of a flexible material can be freely mounted according to the body shape of the animal or human body to which the radio device is attached. on the other hand,
By using a card-shaped flat plate for the wireless device housing, it is possible to realize a small wireless device that is small in size and has excellent wearability on an animal or a human body.

It is considered that the small radio device of the present invention is inevitably used under the condition of bad environment due to its nature. On the other hand, by coating the small radio device with a weather resistant dielectric film, it is possible to realize a small radio device having high weather resistance and less metal deterioration due to corrosion.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views showing a first embodiment of the present invention, in which FIG. 1A is a perspective view, FIG. 1B is a view in which a part of a mounting member is cut away so that an internal structure can be seen, and FIG. ) Is a top view of the wireless device excluding a mounting member, and (d) is a side view of the same.

In the figure, 1 is a dielectric substrate, 2 is a ground conductor made of a metal film, 3 is an antenna radiating element made of a metal film deposited on the surface of the dielectric substrate 1, 4 is a radio housing, 5 Is a mounting base made of a dielectric material, 6 is an outer conductor of the power feeding connector, 7 is an inner conductor of the power feeding connector, and 8 is a string or a tape through hole for mounting on a human body or an animal. As shown in FIG. 1, the outer conductor 6 of the power feeding connector is connected to the ground conductor 2, and the inner conductor 7 of the power feeding connector is connected to the antenna radiating element 3.

The microstrip antenna is covered with a mounting base made of a dielectric material and has an integrated structure. In addition, the radio housing 4 has a structure covered with a dielectric material. The radiating element length of the antenna radiating element 3 is about 1 of the resonance wavelength in consideration of the dielectric constant of the dielectric substrate 1.
It is configured to have an electric length of / 2.

FIG. 2 shows the radiation directivity of vertically polarized waves in the horizontal plane of the antenna of the above embodiment. About -5.5
A directional gain of dBd (dipole ratio) is obtained,
Good radiation characteristics are realized.

FIG. 3 is a view showing a state where the small radio device of the present invention is mounted on a simulated bird body and used (a), (b).
Shows a side view and (c) shows a top view. In the figure, 4 is a radio housing, 5 is a mounting member, 9 is a string or band for attaching to a human body or an animal, and 10 is a simulated bird body. The simulated bird body imitates the body of the bird body and is composed of a lossy dielectric material. FIG. 4 shows the radiation directivity of vertically polarized waves in the horizontal plane. About -7.7
A directional gain of dBd (dipole ratio) is obtained,
It can be seen that good radiation characteristics are realized.

FIGS. 5A and 5B are views showing a second embodiment of the present invention in which the radiating element is fed by a microstrip line. FIG. 5A is a top view and FIG. 5B is a side view. It is a figure. In this figure, the mounting member is omitted in order to clearly show the structure of the main part.

In the figure, 1 is a dielectric substrate, 2 is a ground conductor made of a metal coating, 3 is an antenna radiating element made of a metal coating deposited on the surface of the dielectric substrate 1, 4 is a radio housing, 6 is an outer conductor of the power feeding connector, 7 is an inner conductor of the power feeding connector, 11 is a strip conductor of a microstrip line, and 12 is a notch provided in the antenna radiating element for the purpose of impedance matching. The outer conductor 6 of the power supply connector is connected to the ground conductor 2 and the inner conductor 7 of the power supply connector is connected.
Are connected to the strip conductor 11. Even with such a configuration, characteristics similar to the radiation directivity shown in FIGS. 2 and 4 can be obtained.

As described above, by integrating the microstrip antenna with the mounting member made of a dielectric material, the antenna radiating element is resonated in consideration of the permittivity of the dielectric substrate 1 as in the case of a normal microstrip antenna. Since the electric length can be configured to be about ½ of the wavelength, it is possible to realize a small radio device having high antenna radiation efficiency and high antenna gain. Further, since the microstrip antenna is integrated with the mounting member made of a dielectric material, it can be easily attached to an animal or a human body just like the conventional small radio device.

In the above embodiment, an example in which a cord or band is used to attach to a human body or an animal has been shown, but the present invention is not limited to this. For example, in the case of an animal, hair growth is performed. In consideration of replacement, it is possible to directly attach the attachment member to the body surface of the animal without using a string or band.

6A and 6B are views showing a third embodiment of the present invention. FIG. 6A is a top view and FIG. 6B is a side view. Also in this figure, the mounting member is omitted as in the case of FIG. This also applies to each of the following embodiments. The element length of the antenna radiating element 3 is set to an electrical length of about 1/4 of the resonance wavelength in consideration of the dielectric constant of the dielectric substrate 1, and one side of the radiating element is short-circuited so that it is about 1 / th compared to a standard microstrip antenna. 2 shows an embodiment in the case of downsizing to a size of 2.

For example, "Reference: Haneishi et al .:" About miniaturization of elements for planar antennas "" (Technical Report of the Television Society of Japan, December 29, 1987, vol. 10, no. 4).
4, pp. In 7), "2/4 system MSA, that is, S
Horted-MSA is a standard 2/2 type standard MSA
On the other hand, since it can be configured with a size of ½ or less at the same resonance frequency, it is considered to be an effective element when miniaturizing a planar antenna. Is stated. Hereinafter, it is considered to be an effective element in reducing the size of the antenna of this embodiment. "
Is stated.

Hereinafter, the antenna of this embodiment will be referred to as a one-side short-circuit type microstrip antenna. In FIG. 6, 13
Is a metal conductor that short-circuits the ground conductor 2 and the antenna radiating element 3.

FIG. 7 shows the radiation directivity of vertically polarized waves in the horizontal plane of the antenna of this embodiment, which is about -11.5.
A directional gain of dBd (dipole ratio) is obtained,
It can be seen that good radiation characteristics are realized.

8A and 8B are views showing a fourth embodiment of the present invention, wherein FIG. 8A is a top view and FIG. 8B is a side view.
This embodiment shows an example in the case of a one-side short-circuit type microstrip antenna that is fed by a strip line.

In the figure, a dielectric substrate, 2 is a ground conductor made of a metal film, 3 is an antenna radiating element made of a metal film deposited on the surface of the dielectric substrate 1, 4 is a radio housing, and 6 is The outer conductor of the power feeding connector, 7 is the inner conductor of the power feeding connector, 11 is the strip conductor of the strip line, 1
Reference numeral 2 is a notch provided in the antenna radiating element for the purpose of impedance matching. The outer conductor 6 of the power feeding connector is connected to the ground conductor 2, and the inner conductor 7 of the power feeding connector is connected to the strip conductor 11.

Even in the case of such a configuration, a characteristic similar to the radiation directivity shown in FIG. 7 can be obtained, and a small radio device having high antenna radiation efficiency and high antenna gain can be realized.

As described above, by using the one-side short-circuited microstrip antenna, it is possible to construct the antenna at a size equal to or less than half that of the standard microstrip antenna at the same resonance frequency. A wireless device can be realized.

9A and 9B are views showing a fifth embodiment of the present invention, wherein FIG. 9A is a top view and FIG. 9B is a side view.
The present embodiment is an example of a one-side short-circuit type microstrip antenna in which the radio housing is configured to come into contact with the edges of the dielectric substrate and the ground conductor.

FIG. 10 shows the radiation directivity of vertically polarized waves in the horizontal plane, and a directivity gain of about -8.7 dBd (dipole ratio) is obtained, and the entire radio housing and the micro Compared to the second embodiment in which the radio housing is installed so that the ground conductors of the strip antenna are overlapped, it is about 3
It can be seen that the dB gain is improved.

As described above, when the microstrip antenna is viewed from a direction perpendicular to the dielectric substrate or the ground conductor, a part of the radio housing is configured to contact or overlap with the edge portion of the dielectric substrate or the ground conductor. As a result, the same effect as if the ground conductor of the microstrip antenna becomes equivalently large occurs, and the antenna gain can be improved.

FIG. 11 is a diagram showing a sixth embodiment of the present invention, in which the relationship between (a) and (b) is the same as in the previous embodiment. And these are the same also about each Example mentioned later. The present embodiment is an example of a case in which the ground conductor 2 of the one-sided deaf type microstrip antenna and the metal conductor 13 that short-circuits the antenna radiating element 3 are in contact with the radio housing. In the figure, 14 is a coaxial line.
Even with such a configuration, a characteristic equivalent to the radiation directivity shown in FIG. 10 can be obtained.

FIG. 12 is a diagram showing a seventh embodiment of the present invention, in the case of a normal microstrip antenna, in which the radio housing is configured to come into contact with the edges of the dielectric substrate and the ground conductor. Is an example of. Even with such a configuration, the antenna can achieve the same high gain as in the above-described embodiment.

FIG. 13 is a diagram showing an eighth embodiment of the present invention, and shows an example in which the shape of the radio housing is flat. In this way, by configuring the shape of the radio housing to be a flat plate with an extremely thin thickness, it is possible to configure the radio in a low posture, which makes it easy to attach to animals and humans and can be used in a variety of attachment methods. Can be realized.

FIG. 14 is a view showing a ninth embodiment of the present invention and shows an example in which the short-circuit type microstrip antenna is molded into a curved shape. FIG. 15 shows FIG.
It is a figure which shows the example which actually uses the microstrip antenna shown in FIG. 4, (a) is a state of mounting | wearing with an animal,
(B) has shown the structure of a radio.

In FIG. 15, reference numeral 15 is a collar-shaped mounting member, 16 is a neck of an animal, and a short-circuit type microstrip antenna is incorporated in the collar-shaped mounting member 15. The machine is mounted so that it is located under the neck, and the radio and microstrip antenna are connected by a coaxial line.

As described above, by forming the microstrip antenna in a curved shape in accordance with the shape of the human body or animal to which the radio is attached, the microstrip antenna can be directly attached to various places of the animal or human body. The example radio structure has excellent wearability on an animal or human body, and can be used in a variety of ways.

In the present embodiment, the shape of the microstrip antenna is formed into a curved surface, the microstrip antenna is mounted so as to come to the upper surface of the animal's neck, and the radio device to the bottom surface of the neck. The radio device and the microstrip antenna are coaxial. Although the case where the structure is connected by a line is shown, the same effect can be obtained when the microstrip antenna and the radio housing are integrated.

Further, in this embodiment, an example in which the one-side short-circuited microstrip antenna is used is shown, but the same effect can be obtained even when a normal microstrip antenna is used. Further, in the present embodiment, the embodiment in which the microstrip antenna and the radio housing are not in contact with each other has been described, but the same applies when the microstrip antenna and the radio housing are contacted and integrated.

On the other hand, in the present embodiment, the case of the radio device is shown as a rectangular parallelepiped shape, but the case shape can be a curved surface similar to that of the microstrip antenna. In addition, by covering the collar-shaped mounting member shown in this embodiment with a water-resistant dielectric film, a small radio device that is excellent in water resistance and corrosion resistance and can be used even under various weather conditions is realized. It is possible.

[0046]

As described above, according to the present invention, the microstrip antenna is integrated with the mounting member made of a dielectric material, and the length of the antenna radiating element is approximately ¼ of the operating wavelength in consideration of the dielectric constant. It is possible to prevent the deterioration of the antenna radiation efficiency, and since it is possible to make the antenna have a high gain by this, it is possible to use it near the human body or animal, or to be used by being attached to the human body or animal. There is an advantage that a small radio having high gain can be realized. Further, the advantages of the difference in the configuration of the present invention are listed below.

(1) In the case where the mounting member has a collar shape, the microstrip antenna and the radio housing are attached to the neck of an animal or the like, and the microstrip antenna and the radio housing are connected by a coaxial line. Therefore, the radio can be freely attached depending on the body shape of the animal to which the radio is attached.

(2) When the microstrip antenna is viewed from a direction perpendicular to the dielectric substrate or the ground conductor, a part of the radio housing is configured to contact or overlap the edge portion of the dielectric substrate or the ground conductor. As a result, the same effect as if the ground conductor of the microstrip antenna becomes equivalently large occurs, and the antenna gain can be improved.

(3) If the mounting member and the dielectric plate of the antenna are made flexible, they can be freely mounted according to the body shape of the animal or human body to which the radio is mounted, so that the mounting is free. The degree can be secured.

(4) By using a card-shaped flat plate for the wireless device housing, a low-profile wireless device structure can be obtained, and the entire wireless device can be made compact, so that it can be easily worn on animals and humans. It is possible to realize a small radio device.

(5) By covering the small radio with a weather-resistant dielectric film, the weather resistance is high and metal deterioration due to corrosion can be reduced, so that a small radio that can be used under various weather conditions can be provided. Can be realized.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention.

FIG. 2 is a diagram showing radiation directivity of vertically polarized waves in a horizontal plane of the antenna of the example.

FIG. 3 is a diagram showing a state in which the small radio device of the present invention is mounted on a simulated bird body.

FIG. 4 is a diagram showing radiation directivity of vertically polarized waves in a horizontal plane of the antenna of the example.

FIG. 5 is a diagram showing a second embodiment of the present invention.

FIG. 6 is a diagram showing a third embodiment of the present invention.

FIG. 7 is a diagram showing radiation directivity of vertically polarized waves in a horizontal plane of the antenna of the example.

FIG. 8 is a diagram showing a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a fifth embodiment of the present invention.

FIG. 10 is a diagram showing the radiation directivity of vertically polarized waves in the horizontal plane of the antenna of the example.

FIG. 11 is a diagram showing a sixth embodiment of the present invention.

FIG. 12 is a diagram showing a seventh embodiment of the present invention.

FIG. 13 is a diagram showing an eighth embodiment of the present invention.

FIG. 14 is a diagram showing a ninth embodiment of the present invention.

FIG. 15 is a diagram showing an example in which the microstrip antenna of FIG. 14 is actually used.

FIG. 16 is a diagram showing an example of a conventional small radio device.

FIG. 17 is a diagram showing a radiation directivity of vertically polarized waves in a horizontal plane of a conventional antenna.

[Explanation of symbols]

1: Dielectric Substrate 2: Grounding Conductor Made of Metallic Coating 3: Antenna Radiating Element Made of Metallic Coating 4: Radio Equipment Housing 5: Mounting Material Made of Dielectric Material 6: Outer Conductor of Feeding Connector 7: Inside of Feeding Connector Conductor 8: String or tape through hole for attaching to human body or animal 9: String for attaching to human body or animal 10: Simulated bird body 11: Strip conductor of macrostrip line 12: Notch for impedance matching 13: Ground A metal conductor that short-circuits the conductor 2 and the antenna radiation element 3 14: Coaxial line 15: Collar-shaped attachment member 16: Animal neck 17: Slot provided in the radiation element 18: Notch provided in the radiation element

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 7/32

Claims (7)

[Claims] 1. A radio housing a microstrip antenna connected to at least one of a transmitter and a receiver directly or via a duplexer, and a radio including the transmitter or the receiver or both of them. In a small radio including a device housing and a mounting member made of a dielectric material for mounting the antenna on a human body, an animal, etc., a grounding portion of the wireless device housing, a ground conductor of the microstrip antenna, and a wireless The antenna circuit of the machine and the radiating element are connected via a coaxial line, a power supply connector or a microstrip line, and a part or all of the microstrip antenna is covered with a dielectric material and integrated with a mounting member. A small radio that is characterized. 2. The radio housing is made of a conductive material, and at least a part of the radio housing is attached so as to come into contact with the ground conductor of the microstrip antenna. The small radio device according to claim 1. 3. The small radio according to claim 1, wherein the radio housing is made of a conductive material, and the radio housing is attached so as not to contact the ground conductor of the microstrip antenna. Machine. 4. The small radio device according to claim 1, wherein the radio housing is attached to a dielectric plate forming a microstrip antenna or a side surface of an edge portion of a mounting member. 5. The small radio device according to claim 1, wherein the microstrip antenna and the mounting member are formed so that a side surface or a cross section along a longitudinal direction thereof has a curved surface. 6. The small radio device according to claim 1, wherein the microstrip antenna and the mounting member are made of a flexible material. 7. The small radio device according to claim 1, wherein the radio device and the microstrip antenna are covered with a mounting member together with a weather-resistant dielectric film.