JP3025029B2 - Planar antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar antenna used for receiving satellite communications and satellite radio waves.

[0002]

2. Description of the Related Art Generally, there are two methods of exciting a radiator in a planar antenna: a direct coupling method and an electromagnetic coupling method.
There are two methods, but the electromagnetic coupling method is frequently used because of the ease of manufacturing.

In this electromagnetic coupling method, a feeder is distributed and wired to a position directly below each radiator to achieve coupling, and a probe is inserted from each radiator into the waveguide using a parallel plate along a radiation plane as a waveguide. Some are intended to achieve free bonding.

[0004]

However, in the above-mentioned electromagnetic coupling type planar antenna, the former, in which a feeder is distributed and wired just below each radiator to achieve coupling, causes a large loss in the feeder and an antenna efficiency. However, there is a low disadvantage.

In the latter case, in which a probe is inserted into a parallel plate waveguide from each radiator to achieve coupling, a high antenna efficiency is obtained, but a pin-shaped probe is individually inserted in each of a large number of radiators. Required, which has the disadvantage of poor production efficiency.

[0006] The present invention has been made in view of the above problems,
It is an object of the present invention to provide a planar antenna capable of improving production efficiency without having to insert each probe into each radiator even when an electromagnetic coupling probe system having high antenna efficiency is adopted. I do.

[0007]

That is, a planar antenna according to the present invention comprises a metal plate and an insulating film laminated on the metal plate with a dielectric interposed between the metal plate and the metal plate.
A radiation part formed by bonding a metal foil for forming a wave path ,
A short-circuit plate that is provided along the periphery of the metal plate and short-circuits the metal plate and the metal foil of the radiating portion; and a short-circuit plate formed by exposing the insulating film at a plurality of locations on the metal foil surface of the radiating portion. Was
Slots and the center of each of the slots
A radiator formed by a metal foil, a rectangular notch formed by leaving one side thereof at the center of each radiator, a rectangular metal foil surrounded by the rectangular notch, and a A probe in which a lower rectangular insulating film is folded inside the dielectric with the one side left as a base, and a feeder provided in the center of the metal plate and having a central conductor reaching the inside of the dielectric Are provided.

[0008]

In other words, by forming the probes of the plurality of radiators collectively by press working or the like, the assembling time can be reduced and the production cost can be reduced.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an assembly configuration of a circularly polarized planar antenna. FIG. 2 is a diagram showing a cross-sectional configuration along the line AA of the planar antenna.

In FIGS. 1 and 2, reference numeral 11 denotes a radiating section;
Reference numeral 2 denotes a dielectric, reference numeral 13 denotes a metal plate, and reference numeral 14 denotes an annular short-circuit plate rising along the periphery of the metal plate 13. Metal plate 13
Is provided at the center thereof, and a central conductor 16 is provided upright at the center of the power supply unit 15.

The radiating section 11 is formed by bonding a metal foil 18 of aluminum, copper foil or the like having a thickness of about 35 μm to the surface of an insulating film 17 of a thickness of about 50 μm made of polyester, polyethylene, polystyrene or the like having a small high frequency loss. The insulating film 17 was exposed on the metal foil 18 .
A microstrip antenna is placed in the center of the circular slot.
Numerous slotted microstrip Shikiho elevation 19 formed by, ... are formed respectively by printing etching have the following intervals 1 [lambda.

At the center of each of the radiators 19,..., There is formed an elongated rectangular notch 20, with one short side left, and a metal foil 18 corresponding to the rectangular portion and an insulating film 17 thereunder.
And the radiator 1 having the short side left as a base.
9,... Are vertically folded down as respective probes 21,. On the surface of the dielectric 12, rectangular cut-out holes 22,... Are formed corresponding to the folded positions of the probes 21,.

Here, the radiating portion 11 and the metal plate 13 are short-circuited at an interval of 1λ (wavelength) or less via a short-circuit plate 14 on the periphery thereof. The space in which the dielectric 12 is disposed acts as a parallel plate waveguide.

The dielectric 12 is used as a slow-wave circuit, and is made of foamed polyethylene having high foaming, polystyrene, polyurethane, or other foam having low dielectric loss and a small dielectric constant. In addition, copper,
Conductors such as iron and aluminum are used.

That is, the satellite radio waves received by the large number of radiators 19,.
9,... Through each probe 21,.
And is taken out as a reception signal by the central conductor 16 of the feeder 15. Power supply unit 1
The received signal extracted by the center conductor 16 of No. 5 is guided to a tuner through a frequency converter (not shown) and subjected to reception processing.

FIGS. 3A and 3B show the configuration of a slot type microstrip antenna used as the radiator 19 of the above planar antenna. FIG. 3A is a plan view of the same, and FIG. FIG.

This radiator 19 is formed as a circular patch antenna having a metal (aluminum) foil 18 adhered on an insulating film 17 subjected to print etching and having projections 19a and 19b at both ends. In the center of the vessel 19, an elongated rectangular notch 20 leaving one short side is formed, and the metal foil 18 corresponding to this rectangular portion and the insulating film 17 thereunder are formed by the above-mentioned short-circuit. The radiator 19 is vertically folded down as a probe 21 with the side as a base.

As a result, the probe 21 is pushed down into the dielectric 12 from a position slightly deviated from the center of the radiator 19, so that coupling with the waveguide formed between the radiating portion 11 and the metal plate 13 is achieved.

FIGS. 4 to 8 show different types of radiators 19 used for the above-mentioned planar antenna.
(A), FIG. 5 (B), FIG. 8 (A), FIG. 8 (B) are circular radiators, FIG. 4 (B), FIG. 5 (A), FIG. 6 (B) are square radiators, FIG. FIGS. 7A, 7A, and 7B show a radiator having left and right symmetrical uneven portions.

[0020] In the upper Kiss lot type microstrip en <br/> antenna, FIG. 4 (A), the FIG. 5 (A), the FIG. 7 (A),
FIG. 7B is constituted by a circular slot.
(B), FIG. 5 (B), and FIG. 6 (A) are constituted by rectangular slots. 6 (B), FIG. 8 (A), FIG.
(B) is constituted by slots having left and right symmetrical irregularities.

Here, FIGS. 4A, 4B, and 5A are radiators 19 for linear polarization, respectively, and are shown in FIGS. 6A, 6B, and 6C. 7 (A), 7 (B), 8
FIGS. 8A and 8B show radiators for circular polarization.

Here, in order to install the planar antenna as an antenna for satellite communication, first, a dielectric is placed on the radiating section 11, and the dielectric is further covered with a plastic radome. Then, this antenna is housed in a flat box, and the radome is used as a lid to clamp and fix the antenna to an antenna support. Thereby, weather resistance to wind and rain is enhanced.

That is, when satellite broadcasting is received by the flat antenna, for example, in Japan, 30 to 37 db
. In this case, about 150 to 1000 radiators 19 for circularly polarized waves are provided,
A probe 21 that can be placed on each of the radiators 19,.
... are provided by being folded vertically by pressing or the like with the remaining short side as a base in the elongated rectangular notch 20 formed on the surface of each of the radiators 19,. As described above, it is possible to easily and quickly assemble without having to separately insert probes for a large number of radiators. Next, a second embodiment of the present invention will be described. FIG. 9 is a diagram showing an assembly configuration of the circularly polarized planar antenna. FIG. 10 is a diagram showing a cross-sectional configuration taken along line CC of the planar antenna.

9 and 10, reference numeral 11 denotes a radiation section;
Reference numeral 12 denotes a dielectric, 31 denotes a metal plate, 32 denotes a dielectric, 13 denotes a metal plate, and 14 denotes an annular short-circuit plate rising along the periphery of the metal plate 13. In the center of the metal plate 13, a power supply unit 15 is provided.
Is provided, and a center conductor 16 is provided upright at the center of the power supply unit 15.

The radiating section 11 is provided on the surface of the insulating film 17.
A metal foil 18 made of aluminum, copper foil or the like is bonded and laminated, and the insulating film 17 is exposed on the metal foil 18 .
A microstrip antenna is placed in the center of the circular slot.
Numerous slotted microstrip Shikiho elevation 19 formed by, ... are formed respectively by printing etching have the following intervals 1 [lambda.

At the center of the radiators 19,..., There are formed elongated rectangular notches 20, leaving one short side, respectively. The metal foil 18 corresponding to this rectangular portion and the insulating film 17 thereunder are formed.
And the radiator 1 having the short side left as a base.
9,... Are vertically folded down as respective probes 21,. Then, the dielectric 12, the metal plate 31, the dielectric 3
2 have rectangular cut-out holes 22a, ..., 22b, ..., 22c, corresponding to the folded positions of the probes 21, ..., respectively.
Are formed.

Here, the radiating portion 11 and the metal plate 13 are short-circuited at an interval of 1λ (wavelength) or less via a short-circuit plate 14 on the periphery thereof. The space in which the dielectric 12, metal plate 31, and dielectric 32 are disposed acts as a parallel plate waveguide.

That is, the satellite radio waves received by the large number of radiators 19,.
9,... Through each probe 21,.
And is taken out as a reception signal by the central conductor 16 of the feeder 15.

Therefore, according to the planar antenna having the above configuration, the probes 21 in each of the large number of radiators 19 are formed into an elongated rectangular shape having one short side formed on the surface of each radiator 19. Are vertically depressed with the remaining portions as bases, so that all the probes 21,... Can be collectively provided by press working or the like, so that assembling time and production cost can be reduced. I can do it. Note that the center conductor 16 of the power supply unit 15 in the above embodiment is used.
Can be matched by changing the thickness and length.

Further, in the above-described embodiment, a circular planar antenna has been described. However, a rectangular planar antenna can be formed. In this case, the beam angle can be adjusted by adjusting the rotation angle of the radiator and the length of the probe. Tilt becomes easy, and the side lobe level can be reduced.

[0031]

As described above, according to the present invention, a metal plate and an insulating film laminated on the metal plate via a dielectric are provided .
A radiating portion formed by bonding a metal foil for forming a waveguide between the metal plate and the surface thereof, and a short circuit between the metal plate provided along the periphery of the metal plate and the metal foil of the radiating portion. And the insulating film at a plurality of locations on the metal foil surface of the radiating section.
And slots formed and arranged to expose the, the plurality of scan
A radiator formed by the above metal foil at the center of each lot ; a rectangular notch formed by leaving one side thereof at the center of each radiator; and a rectangular notch formed A probe in which a rectangular metal foil surrounded by a rectangular metal foil and a rectangular insulating film thereunder are folded down into the dielectric with one side as a base, and a central conductor provided in the center of the metal plate and Since it is configured to include the power supply unit reaching the inside of the dielectric, the probes of the plurality of radiators can be collectively formed by press working or the like, and an electromagnetic coupling probe system with high antenna efficiency is adopted. Even in this case, the production efficiency can be improved without having to insert the probes one by one into each radiator.

[Brief description of the drawings]

FIG. 1 is a diagram showing an assembly configuration of a planar antenna according to one embodiment of the present invention.

FIG. 2 is a diagram showing a cross-sectional configuration taken along line AA of the planar antenna.

FIG. 3 is a diagram showing a configuration of a slot-type microstrip antenna used as a radiator of the planar antenna.

FIG. 4 is a diagram showing an example of a radiator used for the planar antenna.

FIG. 5 is a diagram showing an example of a radiator used for the planar antenna.

FIG. 6 is a diagram showing an example of a radiator used for the planar antenna.

FIG. 7 is a diagram showing an example of a radiator used for the planar antenna.

FIG. 8 is a diagram showing an example of a radiator used for the planar antenna.

FIG. 9 is a diagram showing an assembling configuration of a planar antenna according to a second embodiment of the present invention.

FIG. 10 is a diagram showing a cross-sectional configuration taken along line CC of the planar antenna in FIG. 9;

[Explanation of symbols]

11 radiating part, 12 dielectric, 13 metal plate, 14 short-circuiting plate, 15 feeding part, 16 central conductor, 17 insulating film,
18 ... metal foil, 19 ... radiator, 20 ... rectangular notch, 2
1 ... probe, 22 ... rectangular downhole.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01Q 13/08-13/10

Claims (2)

(57) [Claims] 1. A metal plate, and a surface of an insulating film laminated on the metal plate via a dielectric.
And a radiating portion formed by bonding a metal foil for forming a waveguide between the metal plate and the metal plate, and provided along the periphery of the metal plate to short-circuit the metal plate and the metal foil of the radiating portion. The insulating film is exposed at a plurality of locations on the metal foil surface of the radiating portion with the short-circuit plate.
A slot which is arranged and formed by, depending on the metal foil in the center of each the plurality of slots
A radiator formed by: a rectangular notch formed by leaving one side in the center of each radiator; a rectangular metal foil surrounded by the rectangular notch; A probe in which a rectangular insulating film is folded into the dielectric with the one side left as a base, a power supply unit provided in the center of the metal plate and having a central conductor reaching the inside of the dielectric, A planar antenna, comprising: 2. A planar antenna according to claim 1, wherein said radiator is constituted by a microstrip antenna.