JPH05235636A - Plane antenna system - Google Patents

Abstract

PURPOSE:To improve the mass-productivity by making a wave delay circuit made of an insulator material with a radiation layer formed integrally thereto in close contact in a ground disk made of a metallic disk and fitting freely the circuit in a conductor layer having an asymmetrical inner circumferential shape so as to prevent occurrence of mis-assembling. CONSTITUTION:A radiation layer 21 with a chevron-shaped slot 21a formed' in spiral thereto is formed integrally with a delay wave circuit 20. An outer circumferential shape of the delay wave circuit with the radiation layer 21 formed integrally thereto is formed in spiral, that is, both sides with a center point inbetween are formed asymmetrically. The circuit is free-fit into a ground disk 19 having an inner circumferential shape almost corresponding to the spiral shape. As a result, when the delay wave circuit 20 with the radiation layer 21 formed integrally thereto is turned over, the circuit cannot be mounted into the ground conductor 19. Thus, occurrence of mis-assembly is prevented, the performance is sufficiently ensured by a periodic sampling inspection or the like and the progress of mass-productivity is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar antenna device using a circular waveguide, and more particularly to a device suitable for use as a satellite broadcast receiving antenna or the like.

[0002]

2. Description of the Related Art As is well known, a conventional planar antenna using a circular waveguide has a frame 11 made of a ground conductor of a metal plate and a slow wave circuit 12 made of an insulating material, as shown in FIG. A radiation plate 13 having a plurality of openings 13a for radiating power, and a radome 14, which are composed of a flexible substrate including a metal foil and an insulating film.
The radome 14 and the radiating plate 13 are interposed between the radiating plate 13 and the radiating plate 13 to keep the radiating plate 13 flat.
Is electrically connected to a converter (not shown) via.

Here, as the opening 13a of the radiation plate 13, as an example of a radial line for circular polarization, as shown in "A.P89-54 of the Institute of Electronics, Information and Communication Engineers, Basic Study of Radial Line Slot Antenna". , "C"
The V-shaped slots are formed in a spiral shape on the radiation plate 13. Then, the planar antenna using this circular waveguide functions as a right-handed circularly polarized wave reception and a left-handed circularly polarized wave reception depending on the spiral rotation direction of the “C” -shaped slot formed in the radiation plate 13. being classified.

The conventional planar antenna using the circular waveguide having the above structure can obtain a certain level of performance only by assembling the above-mentioned members by superposing them as shown in FIG. There is an advantage that. However, as antenna production increases with the spread of satellite broadcasting, planar antennas are often assembled by persons without specialized knowledge. For this reason, for example, if the radiation plate 13 having the “H” shaped slot for right-handed circularly polarized wave reception is overlaid on the inside and assembled, the planar antenna becomes for left-handed circularly polarized wave reception. ,
There arises a problem that the right-handed circularly polarized wave that should be originally received cannot be received at all.

Therefore, conventionally, it is necessary to perform a 100% inspection such as performing a reception test on all the assembled planar antennas to find misassembly. In addition, in this case, if the satellite radio wave is used as the signal source, for example, the reception test may have to be interrupted due to the weather (rain), or the inspection place is not a place where the satellite radio wave can be received. There will be a constraint that it will not grow. Further, if a signal generator or the like is used to generate a signal without using satellite radio waves as a signal source, a large-scale facility is required, which is economically disadvantageous.

[0006]

As described above, in the conventional planar antenna using the circular waveguide, since it is easy to erroneously assemble, it is necessary to perform 100% inspection.
The reception test itself for the inspection is complicated and has a problem that it hinders mass production.

Therefore, the present invention has been made in consideration of the above circumstances, and it is possible to prevent misassembly and sufficiently secure the performance by a regular sampling inspection, which is effective for mass production. It is an object of the present invention to provide a very good planar antenna device that can be promoted to

[0008]

A planar antenna device according to the present invention comprises a bottom surface having a shape in which asymmetric portions are present on both sides of a center point and side surfaces rising from a rim of the bottom surface at a predetermined angle. A first conductive layer having a substantially concave shape, and an insulator as a slow-wave circuit formed in an asymmetrical shape substantially corresponding to the shape of the bottom surface so as to be loosely fitted in the first conductive layer; A second surface is integrally formed on the surface of the insulator opposite to the bottom surface of the first conductive layer and has a power radiation opening forming a circular waveguide along with the first conductive layer. And a conductive layer.

[0009]

According to the above structure, the second conductive layer having the power radiation opening is integrally formed on the insulator, and the insulator is integrally formed with the second conductive layer. The outer peripheral shape of is formed so as to have an asymmetrical shape on both sides of the center point, and this is loosely inserted into the first conductive layer having an inner peripheral shape substantially corresponding to the asymmetrical shape. When the integrally formed insulator of the second conductive layer is turned inside out,
It becomes impossible to mount it in the first conductive layer, and it is possible to reliably prevent misassembly. Therefore, there is no need to perform 100% inspection as in the past,
Sufficient performance can be secured by regular sampling inspections, and mass production can be effectively promoted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 17 is a disc-shaped frame made of a synthetic resin material, and a recess 17a is formed on the upper surface in the figure. This recess 17
The a is composed of a flat bottom surface 17b, a peripheral side surface 17c formed in a spiral shape for one rotation, and a short side surface 17d radially connecting both ends of the peripheral side surface 17c.

A through hole 17e is formed in the central portion of the bottom surface 17b of the frame 17 so that the coaxial line feeding portion 18a of the converter 18 is inserted therethrough. In addition, frame 1
On the bottom surface 17b of No. 7, the pins 17f, 17g, 17h, 17h, 17h, 17h, 17h, 17h, 17h, 17h, 17h, 25a, 25d on the two axes a, b passing through the center point of the through hole 17e and orthogonal to each other are provided.
17i is projected.

A ground conductor plate 19 is fitted in the recess 17a of the frame 17. This ground conductor plate 19
Is formed by press-molding a metal plate to form a bottom surface 19a, a peripheral side surface 19b, and a short side surface 19c that are closely adhered to the bottom surface 17b, the peripheral side surface 17c, and the short side surface 17d of the frame 17, respectively. Is.

Further, the bottom surface 19a of the ground conductor plate 19 is provided with a through hole 19d through which the coaxial line feeding portion 18a of the converter 18 is inserted at the center thereof, and the frame 1
Through holes 19e, 19f, 19g, and 19h, through which the pins 17f, 17g, 17h, and 17i of 7 are inserted, respectively.

A slow wave circuit 20 is loosely fitted in the ground conductor plate 19. The slow wave circuit 20 is formed of an insulating material in a substantially disc shape, and a radiation layer 21 made of a conductor is integrally formed on the upper surface in the figure. The radiation layer 21 is provided with a “H” -shaped slot 21 a formed in a spiral shape. The side surface of the slow-wave circuit 20 integrally formed with the radiation layer 21 is the peripheral side surface 1 of the ground conductor plate 19.
It has a spiral shape substantially corresponding to 9b and the short side surface 19c.

The spiral shape is described in, for example, "Design of Matching Spiral of A.P90-31 Radial Line Slot Antenna of Institute of Electronics, Information and Communication Engineers" in FIG. 2 is a matching spiral, and the peripheral side surface 19b and the short side surface 19c of the ground conductor plate 19 are different from the side surface spiral shape of the slow wave circuit 20 in which the radiation layer 21 is integrally formed, FIG. 3 is greatly raised by the width W shown in FIG. 3, and the rising angle is also as shown in FIG. It is assumed that the relationship of T2 / T1 shown in 3 is satisfied.

The slow wave circuit 20 includes a radiation layer 2
1 including the pins 17f, 17g, 1 of the frame 17
Long holes 20a, 20b, 20 into which 7h, 17i are loosely inserted
c and 20d are provided respectively. These long holes 2
0a, 20b, 20c and 20d are formed to be radially long in the radial direction.

Therefore, the ground conductor plate 19 is fitted in the recess 17a of the frame 17, and the slow wave circuit 20 integrally formed with the radiation layer 21 is loosely fitted in the ground conductor plate 19, whereby the frame is formed. 17 pins 17f, 17g, 17h, 1
7i are through holes 19e, 19f, 19g of the ground conductor plate 19,
Through the 19h, the radiation layer 21 is loosely inserted into the long holes 20a, 20b, 20c and 20d of the slow wave circuit 20 integrally formed.

Then, a radome 24 is covered from the upper surface side of the radiation layer 21 in the figure through a spacer 22 and a waterproof ring 23, which are formed in a disk shape with a low dielectric constant material such as styrene foam, and the radome 24. Frame 17
By fixing and, the planar antenna is assembled. The converter 18 is mounted from the lower surface side of the frame 17 in the figure through a waterproof ring 25.

Here, FIG. 2 shows a side section of the planar antenna assembled as described above. First, the pins 17f, 17g, 17h, 17i of the frame 17
Has its tip portion projected to the upper portion of the radiation layer 21 in the figure, and by fitting a retaining ring 26 to this projection portion, the slow wave circuit 20 integrally formed with the radiation layer 21 can be installed in the frame 17. It is fixed in the recess 17a.

Further, the converter 18 is fixed to the frame 17 by inserting a screw 27 into a flange portion 18b formed on the housing and screwing the screw 27 into a nut 28 embedded in the frame 17. In this case, in the converter 18, a circular groove 18c is formed on the contact surface with the frame 17 so as to surround the coaxial line power supply portion 18a, and the waterproof ring 25 is housed in the groove 18c.

Further, the frame 17 and the radome 24 are provided.
The screw 29, which is inserted from the side of the frame 17 at the peripheral portion thereof, is fixed by being screwed into the radome 24. Further, the radome 24 is formed with a circular groove 24a along a peripheral edge portion which comes into contact with the frame 17, and the waterproof ring 23 is housed in the groove 24a.

Therefore, according to the structure of the above-mentioned embodiment, the radiation layer 21 in which the "H" -shaped slot 21a is spirally formed is integrally formed in the slow wave circuit 20, and the radiation layer 21 is formed. The outer peripheral shape of the integrally formed slow wave circuit 20 is formed in a spiral shape, that is, the both sides are asymmetrical with respect to the center point, and the inner peripheral shape substantially corresponds to the spiral shape. Since it is loosely inserted in the conductor plate 19, if the integrally formed slow wave circuit 20 of the radiation layer 21 is turned upside down, it cannot be mounted in the ground conductor plate 19 and erroneous assembly occurs. This can be reliably prevented. For this reason, it is not necessary to perform 100% inspection as in the conventional case, sufficient performance can be ensured by periodical sampling inspection, and mass production can be effectively promoted.

The slow wave circuit 20 integrally formed with the radiation layer 21 has elongated holes 20a, 20b, 20c and 20.
Since d is formed radially in the radial direction as described above, it does not move in the directions of the axes a and b and the rotation direction, and can be easily positioned in the frame 17 during assembly. Further, for expansion and expansion of the slow wave circuit 20 integrally formed with the radiation layer 21 caused by receiving heat from sunlight or the like which is an external environmental factor, the long holes 20a, 20b, 20c and 20d are formed. Since it is formed in the radial direction, almost no stress is generated in the slow wave circuit 20 integrally formed with the radiation layer 21.

Here, the shape of the slow wave circuit 20 integrally formed with the radiation layer 21 is not limited to the spiral shape described above, and as shown in FIG. 3, it is circular and has a center point sandwiched on the circumferential side. A plurality of (three in the illustrated case) cutouts 30 are formed so that there are portions having asymmetrical shapes on both sides, and the projections that can be loosely inserted into the cutouts 30 are formed in the recesses 17a of the frame 17. Even if 31 is formed, it is possible to reliably prevent erroneous assembly.

Further, each pin 1 protruding from the frame 17
7f, 17g, 17h, and 17i, if the means for fixing the slow wave circuit 20 to the frame 17 without using the retaining ring 26 is used, as shown in FIG. If the height of the circuit 20 is halfway, the above-described positioning effect can be obtained. Further, as shown in FIG. 5, the waterproof ring 25 interposed between the frame 17 and the converter 18 has a circular groove 32 formed on the frame 17 side and is housed in the groove 32. Good.

In addition to this, for example, the ground conductor plate 19 may be formed by applying a conductive paint into the concave portion 17a of the frame 17 or by electrically conducting the frame 17 itself without pressing a metal plate to form it. It can be replaced by forming it with a conductive material. Also, the frame 17 and the radome 24
Fixing with and can be realized not only by the screwing means with the screw 29 but also by adhesion. Furthermore, the converter 18
The means for fixing the
It is also possible to embed the head portion so that the threaded portion of the bolt is exposed, and to insert the threaded portion of the bolt into the flange portion 18b of the converter 18 and screw it into the nut. The present invention is not limited to the above-described embodiments, but can be variously modified and implemented without departing from the scope of the invention.

[0027]

As described in detail above, according to the present invention,
It is possible to provide a very good planar antenna device which can prevent misassembly and can sufficiently secure the performance with a regular sampling inspection, and which can effectively promote mass production.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a planar antenna device according to the present invention.

FIG. 2 is a side sectional view showing the assembled state of the embodiment.

FIG. 3 is an exploded perspective view for explaining a modified example of the main part of the same embodiment.

FIG. 4 is a side sectional view for explaining a partially modified example of the same embodiment.

FIG. 5 is a side sectional view for explaining a partially modified example of the same embodiment.

FIG. 6 is a side sectional view showing a planar antenna using a conventional circular waveguide.

[Explanation of symbols]

11 ... Frame, 12 ... Slow wave circuit, 13 ... Radiant plate, 14
... radome, 15 ... spacer, 16 ... coaxial line, 17 ...
Frame, 18 ... Converter, 19 ... Ground conductor plate, 20 ...
Slow wave circuit, 21 ... Radiation layer, 22 ... Spacer, 23 ... Waterproof ring, 24 ... Radome, 25 ... Waterproof ring, 26 ... Retaining ring, 27 ... Screw, 28 ... Nut, 29 ... Screw, 30 ...
Notch, 31 ... Projection, 32 ... Groove.

Claims (9)

[Claims] 1. A first conductive layer formed in a substantially concave shape having a bottom surface having an asymmetric portion on both sides of a center point and a side surface rising from a peripheral portion of the bottom surface at a predetermined angle. An insulator as a slow wave circuit formed in an asymmetrical shape substantially corresponding to the shape of the bottom surface so as to be loosely fitted in the first conductive layer, and a bottom surface of the first conductive layer of the insulator. And a second conductive layer integrally formed on a surface opposite to the first conductive layer and having a power radiation opening forming a circular waveguide along with the first conductive layer. A characteristic planar antenna device. 2. The first conductive layer is fitted in a concave frame formed of an insulating material having a bottom surface and a side surface to which the bottom surface and the side surface are closely attached, respectively. Item 2. The planar antenna device according to item 1. 3. A pair of pins, which sandwich the center point on two axes passing through the center point and orthogonal to each other, project from the bottom surface of the frame, and the bottom surface of the first conductor layer comprises: A plurality of through holes through which the pins are respectively inserted are formed, and the insulator is provided along the two shafts through which the pins penetrating through the through holes of the first conductor layer are respectively loosely inserted. The planar antenna device according to claim 2, wherein a plurality of elongated holes are formed. 4. A through hole for guiding the coaxial line power feeding portion of the converter to the second conductive layer is formed at the center of the bottom surface of the frame and the bottom surface of the first conductor layer. The planar antenna device according to claim 2, wherein 5. The planar antenna device according to claim 4, wherein a jig for mounting the converter is embedded in the frame. 6. The circular groove, in which a waterproof ring is housed, is formed on the contact surface of the converter with the frame so as to surround the coaxial line power feeding portion. Planar antenna device. 7. The circular groove for accommodating a waterproof ring is formed on the contact surface of the frame with the converter so as to surround the coaxial line power feeding portion. Planar antenna device. 8. The insulator material has a bottom surface having a shape in which asymmetric portions are present on both sides of a center point and side surfaces rising from the edge of the bottom surface at a predetermined angle. 2. The planar antenna device according to claim 1, wherein the frame is formed in a substantially concave shape by applying a conductive paint. 9. The planar antenna device according to claim 1, wherein the insulator integrally formed with the second conductive layer is formed in a spiral shape.