JPH09162632A - Microstrip antenna - Google Patents

Microstrip antenna

Info

Publication number
JPH09162632A
JPH09162632A JP31566995A JP31566995A JPH09162632A JP H09162632 A JPH09162632 A JP H09162632A JP 31566995 A JP31566995 A JP 31566995A JP 31566995 A JP31566995 A JP 31566995A JP H09162632 A JPH09162632 A JP H09162632A
Authority
JP
Japan
Prior art keywords
microstrip antenna
conductor
dielectric
dielectric plate
antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP31566995A
Other languages
Japanese (ja)
Inventor
Masahiko Asano
Shiyuuji Kobayakawa
Hiroyuki Seki
Takeshi Toda
周磁 小早川
健 戸田
賢彦 浅野
宏之 関
Original Assignee
Fujitsu Ltd
富士通株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd, 富士通株式会社 filed Critical Fujitsu Ltd
Priority to JP31566995A priority Critical patent/JPH09162632A/en
Publication of JPH09162632A publication Critical patent/JPH09162632A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide the microstrip antenna whose resonance frequency is optionally varied after the antenna is manufactured. SOLUTION: In the microstrip antenna, a 1st dielectric board 4 and a 2nd dielectric board 1 provided with a ground conductor 2 are supported by an adjustment means 7 so as to form a gap (d) between the 1st and 2nd dielectric boards 4, 1, and the adjustment means 7 is used to move the 1st and 2nd dielectric boards 4, 1 thereby varying the gap between a radiation conductor 3 and the ground conductor board 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microstrip antenna mainly used in microwave band or millimeter wave band communication.

This microstrip antenna is used not only in wireless communication equipment but also in office automation equipment such as personal computers, and is also used for performing wireless data communication in the office. Spreading.

However, since the resonance frequency is fixed in the finished product, there is a demand for a type in which the resonance frequency can be arbitrarily changed.

[0004]

2. Description of the Related Art FIG. 11 is a perspective view showing a structure of a conventional microstrip antenna (hereinafter, simply referred to as an antenna), and FIG. 12 is a sectional view taken along line AA 'in FIG.

In these figures, 1 is a dielectric plate, 2 is a ground conductor plate, 3 is a radiation conductor, and 11 is a coaxial cable. In an antenna having such an element, a circular radiating conductor 3 is formed at the center of the upper surface of a rectangular parallelepiped dielectric plate 1, a ground conductor plate 2 is formed on all of the lower surface, and further at a predetermined position on the lower surface. The coaxial cable 11 for power supply is fixed, and the signal line of the coaxial cable 11 penetrates the dielectric plate 1 and is connected to the radiation conductor 3. That is, the radiating conductor 3 is directly fed with the coaxial cable 11 to operate as an antenna.

This type of antenna is constructed so that power is fed from the lower part, but there is also a type in which power is fed from the lateral direction of the dielectric plate 1. FIG. 13 is a perspective view of an antenna of the type in which this power feeding is performed from the lateral direction.
FIG. 14 is a sectional view taken along line BB ′ of FIG. 13 and its description will be given. However, in FIGS. 13 and 14, the portions corresponding to the respective portions in FIGS. 11 and 12 are designated by the same reference numerals and the description thereof will be omitted.

In the antenna shown in FIGS. 13 and 14, a microstrip line 5 for power supply extending from one end to a substantially central part is formed on the upper surface of the dielectric plate 1, and a microstrip is formed on the upper surface of the dielectric plate 1. A second dielectric plate 4 having substantially the same shape as the radiation conductor 3 is provided so that a part of the line 5 is sandwiched, and the radiation conductor 3 is formed on the upper surface of the dielectric plate 4.

That is, the radiating conductor 3 is electromagnetically fed by the microstrip line 5 to operate as an antenna.

[0009]

By the way, the frequency characteristic of the resonance frequency of the microstrip antenna has a narrow band and is determined by the permittivities of the dielectric plates 1 and 4 and the radius of the radiation conductor 3. If the dielectric plates 1 and 4 and the radiation conductor 3 are manufactured according to the wavelength of, the resonance frequency is fixed, and if the resonance frequency is deviated due to the influence of the surroundings, there is a problem that radio waves cannot be transmitted and received properly. It was

The present invention has been made in view of the above points, and an object of the present invention is to provide a microstrip antenna capable of arbitrarily changing the resonance frequency after the antenna is formed.

[0011]

FIG. 1 shows the principle of the present invention. The microstrip antenna shown in FIG. 1 is
A first dielectric plate 4 provided with a radiation conductor 3 and a ground conductor 2
And the second dielectric plate 1 provided with a space d between them.
The adjustment means 7 supports the first and second dielectric plates 4, 1 so that the distance between the radiation conductor 3 and the ground conductor plate 2 can be varied. .

In such a structure, the adjusting means 7 moves the first and second dielectric plates 4 and 1 to arbitrarily change the distance between the radiation conductor 3 and the ground conductor plate 2. It is possible to change the resonance frequency by changing the electric capacity during that time.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 2 is a side view showing the configuration of the microstrip antenna according to the first embodiment of the present invention, and FIG. 3 is a perspective view showing an exploded view of FIG. This figure 2
13 and 14 in the first embodiment shown in FIG.
The same reference numerals are given to the portions corresponding to the respective portions of the conventional example shown in FIG.

2 and 3, reference numerals 1 and 4 are dielectric plates, 2 is a ground conductor plate, 3 is a radiation conductor, 5 is a microstrip line for feeding power, 6 is a support (volt), 7,
7'is a nut, 8 is a protective plate, 9 is a support (screw), 10
Is an RF connector. However, the shape of the radiation conductor 3 is arbitrary.

A bolt 6 penetrates and is fixed to the central portion of the dielectric plate 1 having the ground conductor plate 2 formed on the lower surface. In the bolt 6, a dielectric plate 4 and a radiation conductor 3 each having a through hole for passing the bolt 6 in the central portion are provided with nuts 7 and 7 ′ that sandwich the dielectric plate 4 and the radiation conductor 3 in the vertical direction. It is supported by being screwed on.

Further, the protective plate 8 is provided with through holes for allowing the nut 7 to penetrate therethrough and projecting at the center thereof, and through screw holes for screwing the screws 9 at the four corners. There is. Screw holes for screwing the screws 9 are also provided at the four corners of the dielectric plate 1 at positions corresponding to the through screw holes of the protective plate 8.

Such a protective plate 8 is fixed to the dielectric plate 1 by screws 9 on the upper part of the radiation conductor 3 in order to prevent the radiation conductor 3 from being mechanically unstable. R
The F connector 10 has its conductor portion connected to the microstrip line 5 and is fixed to the side surface of the dielectric plate 1.
That is, the radiation conductor 3 is electromagnetically fed by the RF connector 10 and the microstrip line 5.

By turning the nuts 7 and 7 ', the height between the radiation conductor 3 and the ground conductor plate 2 can be adjusted, and the resonance frequency can be varied by changing the height. Has become.

However, as the material of the bolt 6, the nuts 7 and 7 ', the protective plate 8 and the screw 9, a material that has little influence on the electrical characteristics and radiation characteristics of the antenna, such as polycarbonate or vinyl chloride, is used. .

The principle of varying the resonance frequency is shown in FIGS.
This will be described with reference to FIG. First, the resonance frequency f of the conventional antenna shown in FIGS. 13 and 14, r the relative dielectric constant of the dielectric plate l, 4 epsilon, the speed of light c, when the radius of the radiating conductor 3 alpha by: expressed.

F = 1.84c / 2πα × 1 / √ε r However, when the radiation conductor 3 is a square, f = c / 2a × 1 /
It is represented by √ ε r . Let a be the length of one side of the square. The formula is one of the generally known approximation formulas.

On the other hand, an equivalent diagram of the antenna of the first embodiment shown in FIG. 2 is shown in FIG. In FIG. 4, the relative permittivity of the dielectric plate 4 is ε 1r , the height is h 1 , the relative permittivity of the dielectric plate 1 is ε 2r , and the height is h 2, and between the dielectric plates 4 and 1. Let the height of the void be d.

Now, assuming that most of the electromagnetic field is stored between the parallel plates of the dielectric plates 4 and 1 in the electrostatic field mode, the electric capacitance Ca between the parallel plates 4 and 1 is given by And the relative permittivity ε er of the dielectric plate 20 equivalent to the dielectric plates 4 and 1 sandwiching the gap d shown in FIG.
Is represented by the following equation.

Ca = S / [(h 1 / ε 0 ε 1r ) + (d /
ε 0 ) + (h 2 / ε 0 ε 2r )] = ε 0 ε er · S / (h 1
+ D + h 2 ) ε er = (h 1 + h 2 + d) / [(h 1 / ε 1r ) + (h 2
/ Ε 2r ) + d] where S is the area of the parallel plates 4 or 1 and ε 0 is the permittivity of air.

From this, when the nuts 7 and 7'are turned to increase the height d of the gap between the dielectric plates 4 and 1, as can be seen from the equation and the equivalent dielectric constant of the dielectric plate 20. ε er decreases and the resonance frequency f increases. Height of void d
When is lower, the relative permittivity ε er increases and the resonance frequency f decreases.

According to the first embodiment described above, even if the resonance frequency of the antenna is deviated due to the influence of the surroundings, the resonance frequency can be adjusted, so that it is possible to properly transmit and receive radio waves. it can.

Next, a second embodiment will be described with reference to FIG. However, in the second embodiment shown in FIG. 6, parts corresponding to the respective parts of the first embodiment shown in FIGS. 2 and 3 are designated by the same reference numerals, and description thereof will be omitted.

The second embodiment shown in FIG. 6 is different from the first embodiment shown in FIGS. 2 and 3 in that the microstrip line 5 of the dielectric plate 1 is eliminated and the RF connector 10 is connected to the ground conductor plate 2. Mounting, signal line 1 of the RF connector 10
2 penetrates the dielectric plate 1 and is connected to the radiation conductor 3 through the spring 13 made of a conductive material provided between the dielectric plates 1 and 4 and further penetrating the dielectric plate 4. . That is, the power is directly supplied from the RF connector 10 to the radiating conductor 3 to operate as an antenna.

In the second embodiment having such a structure, the same effect as that of the first embodiment can be obtained. Next, a third embodiment will be described with reference to FIG. However, in the third embodiment shown in FIG. 7, parts corresponding to the respective parts of the second embodiment shown in FIG. 6 are designated by the same reference numerals, and description thereof will be omitted.

The third embodiment shown in FIG. 7 differs from the second embodiment shown in FIG. 6 in that the dielectric plate 4 to which the radiation conductor 3 is fixed is eliminated, and the vicinity of the peripheral end of the dielectric plate 4 is eliminated. Attach the power supply contact fitting 14 made of a conductive material to the
In addition, the signal line 1 of the RF connector 10 penetrating the dielectric plate 1
It is configured by connecting two. This third embodiment also operates as an antenna by directly feeding power from the RF connector 10 to the radiation conductor 3, and the same effect as the second embodiment can be obtained.

Next, a fourth embodiment will be described with reference to FIG. However, in the fourth embodiment shown in FIG. 8, parts corresponding to the respective parts of the third embodiment shown in FIG. 7 are designated by the same reference numerals, and description thereof will be omitted.

The fourth embodiment shown in FIG. 8 differs from the third embodiment shown in FIG. 7 in that the dielectric plate 1 to which the ground conductor plate 2 is fixed is eliminated. That is, the signal line 12 of the RF connector 10 penetrating the ground conductor plate 2 is connected to the power supply contact fitting 14 fixed to the radiation conductor 3. Also in the fourth embodiment, the same effect as in the third embodiment can be obtained.

Next, a fifth embodiment will be described with reference to FIGS. 9 and 10. However, in the fifth embodiment shown in FIGS. 9 and 10, the portions corresponding to the respective portions of the first embodiment shown in FIGS. 2 and 3 are designated by the same reference numerals, and the description thereof will be omitted.

The fifth embodiment shown in FIGS. 9 and 10 is shown in FIG.
The difference from the first embodiment shown in FIG. 3 is that a plurality of radiation conductors 3 are arranged on a dielectric plate 4, and a microstrip line 5 formed on the dielectric plate 1 emits a plurality of radiations. It is configured so as to be extended so as to be arranged at a lower position of the conductor 3.

That is, the plurality of radiation conductors 3 are configured to be electromagnetically fed by the microstrip line 5. Fifth application of a plurality of radiation conductors 3 of this kind
Also in the embodiment, the same effect as the first embodiment can be obtained.

[0036]

As described above, according to the microstrip antenna of the present invention, the resonance frequency can be arbitrarily changed after the antenna is formed.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a side view showing the configuration of the microstrip antenna according to the first embodiment of the present invention.

FIG. 3 is an exploded view of the microstrip antenna shown in FIG.

FIG. 4 is an equivalent configuration diagram of the microstrip antenna shown in FIG.

5 is an equivalent configuration diagram of FIG.

FIG. 6 is a side view showing a configuration of a microstrip antenna according to a second embodiment of the present invention.

FIG. 7 is a side view showing the configuration of a microstrip antenna according to a third embodiment of the present invention.

FIG. 8 is a side view showing the configuration of a microstrip antenna according to a fourth embodiment of the present invention.

FIG. 9 is a side view showing the configuration of a microstrip antenna according to a fifth embodiment of the present invention.

FIG. 10 is an exploded view of the microstrip antenna shown in FIG.

FIG. 11 is a perspective view showing a configuration of a conventional microstrip antenna.

12 is a cross-sectional view taken along the line AA ′ of the microstrip antenna shown in FIG.

FIG. 13 is a perspective view showing a configuration of a microstrip antenna according to another conventional example.

14 is a cross-sectional view taken along the line BB ′ of the microstrip antenna shown in FIG.

[Explanation of symbols]

 1 2nd dielectric board 2 Ground conductor 3 1st dielectric board 4 Radiating conductor 7 Adjusting means d Air gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Shugaya Kobayakawa, Kanagawa Prefecture, Kawasaki City, Nakahara-ku, 1015, Kamiodanaka, Fujitsu Limited

Claims (5)

[Claims]
1. A first dielectric plate provided with a radiation conductor,
A second dielectric plate provided with a ground conductor is supported by an adjusting means so that a gap is formed between them, and the first and second dielectric plates are moved by the adjusting means, thereby radiating the conductor. And a microstrip antenna characterized in that the distance between the ground conductor plates can be varied.
2. The microstrip antenna according to claim 1, wherein the radiation conductor and the ground conductor are arranged so as to interpose the first and second dielectric plates with a gap therebetween. .
3. The microstrip antenna according to claim 1, wherein the radiation conductor and the ground conductor are arranged so as to interpose a gap and the second dielectric plate.
4. The microstrip antenna according to claim 1, wherein the radiation conductor and the ground conductor are arranged so as to have a gap therebetween.
5. The microstrip antenna according to claim 1, wherein a plurality of the radiation conductors are provided on the first dielectric plate.
JP31566995A 1995-12-04 1995-12-04 Microstrip antenna Withdrawn JPH09162632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31566995A JPH09162632A (en) 1995-12-04 1995-12-04 Microstrip antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31566995A JPH09162632A (en) 1995-12-04 1995-12-04 Microstrip antenna

Publications (1)

Publication Number Publication Date
JPH09162632A true JPH09162632A (en) 1997-06-20

Family

ID=18068156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31566995A Withdrawn JPH09162632A (en) 1995-12-04 1995-12-04 Microstrip antenna

Country Status (1)

Country Link
JP (1) JPH09162632A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004073108A1 (en) * 2003-02-14 2004-08-26 Kabushiki Kaisha Toshiba Electronic device
KR100662249B1 (en) * 2004-09-01 2007-01-02 한국전자통신연구원 Circulating Microstrip Patch Antenna and Array Antenna using it
JP2015177281A (en) * 2014-03-14 2015-10-05 東芝テック株式会社 The antenna device
JP5848848B1 (en) * 2015-07-07 2016-01-27 パナソニック株式会社 Antenna device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004073108A1 (en) * 2003-02-14 2004-08-26 Kabushiki Kaisha Toshiba Electronic device
US6967623B2 (en) 2003-02-14 2005-11-22 Kabushiki Kaisha Toshiba Electronic apparatus having an antenna with variable dielectric to optimize radio communications at different frequencies
KR100662249B1 (en) * 2004-09-01 2007-01-02 한국전자통신연구원 Circulating Microstrip Patch Antenna and Array Antenna using it
JP2015177281A (en) * 2014-03-14 2015-10-05 東芝テック株式会社 The antenna device
JP5848848B1 (en) * 2015-07-07 2016-01-27 パナソニック株式会社 Antenna device

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20030204