JPH01175302A - Plane antenna - Google Patents

Abstract

PURPOSE:To simplify structure and to reduce cost by arranging a substrate on which a feeding part and plural conductors to this feeding part are provided between a upper side and a lower side plates and providing plural conductors on the upper plates at prescribed intervals in correspondence to each of the plural conductors. CONSTITUTION:A substrate 3 on which a feeding part 9 and plural conductors 4-8 to this feeding part 9 are provided is arranged between an upper side and a lower side plates 1 and 2 and plural slots 10 are provided on the upper plates 2 at the prescribed intervals in correspondence to each of the plural conductors 4-7. Thus, since only the conductors (suspended line) exists substantially on the substrate 3, the fitting of a holding part provided for the upper side plate 1 and the lower side plate 2 to hold the substrate 3 becomes easy, the structures of the upper plate 1 and the lower plate 2 become simple and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat antenna suitable for use, for example, in receiving satellite broadcasting.

[Summary of the invention]

This invention provides a suspended line feed type planar antenna in which a substrate is sandwiched between an upper plate and a lower plate facing the upper plate, in which a feeding section and a substrate provided with a plurality of conductors for the feeding section are placed on the upper and lower sides. The structure is arranged between plates, and the upper plate has a plurality of slots at predetermined intervals corresponding to each of the plurality of conductors, thereby simplifying the structure and reducing costs. .

[Conventional technology]

Conventionally, in a suspended line-fed planar antenna in which a substrate is sandwiched between metal or metallized plastic having many holes that form part of the radiating element, a pair of excitation probes that are perpendicular to each other and corresponding to each of the many holes are connected to a common plane. A circularly polarized plane array antenna has been proposed, which is formed on the top of the antenna and phase-combined the feeding signals to a pair of excitation probes within a suspended line (Japanese Patent Application No. 1983).
-162650).

This makes it possible to reduce the thickness and simplify the mechanical configuration, and even if a cheap and commonly available board is used for high frequency, it is equivalent to or better than using an expensive microstrip line board. Antenna gain of is obtained.

In addition, the suspended line has the advantage of being able to form a low-loss line as a feeding circuit for a planar antenna, and can be formed using an inexpensive film-like substrate.Since a circular or rectangular waveguide aperture element is used as a radiating element, It is possible to construct an array antenna with little gain deviation over a relatively wide band.

On the other hand, as a means of thinning, the so-called batch type utilizes the features of the suspended line and uses a thin radiating element to achieve high efficiency and broadband, and at the same time achieve thinness and weight reduction. A planar antenna has been proposed (Japanese Patent Application No. 62-263157).

This planar antenna is a suspended line fed planar antenna in which a substrate is sandwiched between a pair of metals or metallized plastics, and a planar resonator type printed element is placed on the substrate corresponding to a hole provided in one of the metals or metallized plastics. It is configured as follows.

[Problem that the invention seeks to solve]

However, in the case of a planar antenna in which a pair of excitation probes or a planar resonator type printed element are arranged on a substrate as in the above-mentioned Japanese Patent Application No. 60-162650 and Japanese Patent Application No. 62-263157, the excitation The configuration becomes complicated because it is necessary to provide holding parts on the upper and lower plates that hold the board to avoid the probes, planar resonator type printed elements, and the suspended lines (power supply lines) connected to them. At the same time, it also has drawbacks such as high cost.

In addition, in the case of a slot-shaped slot array antenna with holes drilled in the waveguide and a radiation surface, it is necessary to branch each waveguide in multiple directions at the feeding section, making the feeding structure large and complicated. There were other drawbacks.

The present invention has been made in view of these points, and it is an object of the present invention to provide a planar antenna with a simple configuration and low cost.

[Means for solving problems]

A power supply part (9) and a plurality of conductors (
4 to 8) on the upper and lower plates (3).
1 and 2), and a plurality of conductors (
4 to 7), a plurality of slots (10, 11) are provided at predetermined intervals.

[For production]

A plurality of slots (10, 11) are provided in the upper plate (2) at predetermined intervals to correspond to each of the plurality of conductors (4 to 7). As a result, only the conductor (suspended line) exists on the board, so it is easier to attach the holding parts provided on the upper plate and the lower plate to hold the board, and the structure of the upper plate and the lower plate is that much easier. becomes simple and inexpensive. Also,
Since only one suspended line needs to be placed at the power feeding point, there is no need for multiple branching waveguides and power feeding sections as in the past, which simplifies the power feeding structure.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 to 6.

1 to 4 show an example in which the present invention is applied to a circularly polarized planar antenna, and FIG. 1 shows the overall configuration thereof. In FIG. 1, +11 is a lower plate made of metal or metallized plastic;
2) is an upper plate made of metal or metallized plastic, and (3) is a thin film substrate (film-like flexible substrate) sandwiched between plates (1) and (2). Therefore, the convex holding portions provided on plates +1+ and (2) are omitted here.

In the case of series-parallel power supply, there are a plurality of suspended lines (4) made of conductive foil on the board (3) as shown in Figure 3.
(7) in parallel, and these suspended lines (
4) to (7) are connected to the power supply point (9) with a suspended line (8) made of another conductive foil. Of course, these suspended lines (4) to (8) can be constructed from one conductive foil.

The upper plate (2) is provided with a plurality of resonance slots at predetermined intervals as shown by broken lines in FIG. 3 corresponding to the suspended lines (4) to (7) on the substrate (3), respectively. 01 is provided. In this case, since the wave is circularly polarized, a pair of V-shaped slots α are provided at predetermined intervals corresponding to the suspended lines (4) to (7), respectively. Then, the individual slots (10
The spacing between a) and (10b) is λg/4 (λg is the line wavelength at the center frequency), that is, the orthogonal component (phase λ/4 shift) of the circularly polarized wave is slotted by λg/4 on the suspended line. (10a) +' (10b) is shifted and arranged. This allows power to be supplied in the same phase. Further, the interval between each of the pair of slots +101 is 3λg/4. In other words, in this case as well, the orthogonal component (phase λ shift) of the circularly polarized wave is expressed as λ on the suspended line.
By shifting the pair of slots 001 by g, the power is supplied in the same phase. Slot (1
The width of 0a) and (10b) is, for example, approximately λ/10 at 12G11z, and the length is set to be approximately λ/2 at 12Gl(z, 12G)lz so as to resonate at the frequency. Also, slots (10a) and (10b)
are arranged in a V-shape with an inclination of approximately 45 degrees so that they extend perpendicularly to each other. Also, each slot (log)
, (10b) are arranged so that their centers are offset by a predetermined amount with respect to the suspending lines (4) to (7), as can be seen from FIG. 3, in order to achieve impedance matching with the suspended lines.

Figure 2 is an enlarged view of the line I-1 in Figure 1. During transmission, the power supply point (9) is connected to the suspended line (4).
When a high frequency signal flows to ~(7), suspended lines (4) to (7) and slot Om are electrically coupled,
A part of the high frequency signal substantially flows to each slot OI, and an electric field in the width direction is generated in the slot 0υ, which is emitted to the outside as a radio wave. On the other hand, during reception, when a radio wave comes in, slot 0ω resonates with the frequency of the radio wave, and slot α
An electric field in the width direction is generated at point 1, and the change in this electric field is coupled to the suspended lines (41 to (7)) and the feeding point (
9). The signals that gather at this power feeding point (9) from each pair of slots OI are in phase by setting the predetermined intervals between the individual slots and the pair of slots as described above, and thereby efficient power feeding is achieved. Ru.

In addition, in the case of parallel power supply, suspend lines (4) to (7) are arranged on the board (3) as shown in Figure 4, and these suspended lines (4) to (7) are connected to another suspended line ( 8) Connect to the power supply point. Of course, in this case as well, the suspended lines (4) to (8) can be constructed from one conductive foil. The upper plate (2) has a substrate (
A pair of V-shaped slots Ol are provided corresponding to the branched ends of the suspended lines (4) to (7) above 3), respectively, as shown by broken lines in FIG. Therefore, in the case of parallel power supply, the orientation of the pair of slots 0φ is different from that of the series-parallel power supply shown in FIG. 3, and naturally the orientation of the pair of slots O1 shown in FIG. 1 is also different. In addition, in the case of parallel power feeding, the branched ends of the suspended lines (4) to (7) corresponding to the pair of slots 0 [Il are interconnected so that they are equidistant from the power feeding point (9). There is. In addition, in the case of parallel power supply, the slots (10a) and (Job) constituting the pair of slots αθ) need to be arranged in a relationship perpendicular to the pressure as in the case of series power supply, but the interval between λg/4 on the line
Since the spacing of λg/4 is maintained, it is not necessarily necessary to take the spacing of λg/4 as in the case of series feeding. In addition, each slot (LOA), (10b) is matched with the suspended line so that its center is offset by a predetermined amount from the suspended line (4) to (7), as can be seen from Figure 4. Placed.

5 and 6 show an example in which the present invention is applied to a linearly polarized planar antenna. FIG. 5 shows the case of series-parallel feeding, and FIG. 6 shows the case of parallel feeding.

In the case of series-parallel power feeding, multiple suspended lines (4) to (7) are provided in parallel on the board (3) as in the case of circularly polarized waves, and another suspended line (8) is connected to the feeding point (9).
Connect to. And the upper plate (2) has a substrate (3).
A plurality of resonance slots aυ are provided at predetermined intervals as shown by broken lines in FIG. 5, corresponding to the upper suspended lines (4) to (7), respectively. In this case, since it is a linearly polarized wave, single slots O11 are provided at intervals of λg corresponding to each of the suspended lines (4) to (7) so as to be perpendicular to the lines. At that time, each slot 0υ is impedance matched with the suspended line, so as can be seen from Figure 5, the suspended line (4)
~ (7) The center is arranged so as to be offset by a predetermined amount.

In the case of parallel power supply, suspended lines (4) to (7) are placed on the board (3) as shown in Figure 6, and another suspended line (8) is used to connect the power supply point (9), as in the case of circularly polarized waves.
). However, suspended line (4) ~ (
The end portion of 7) shall be straight without branching. Corresponding to this straight end, a single slot OIl is provided in the upper plate (2) so as to run perpendicularly to the line, as shown by the broken line in FIG. At this time, each slot 0υ is arranged so that its center is offset by a predetermined amount from the suspended lines (4) to (7), as can be seen from FIG. 6, in order to achieve impedance matching with the suspended line.

Furthermore, in the case of parallel power supply, the interval between each slot 0υ is maintained at λg in the suspended line that has already been branched, so it is not necessarily necessary to set the interval of λg as in the case of series power supply.

In this way, in this embodiment, only the suspended lines as multiple conductors are placed on the board, without placing excitation probes or planar resonator type printed elements as in the past, so that the board can be held between the two. Therefore, the holding parts (not shown) provided on the upper plate and the lower plate can be easily positioned, which makes the structure simpler and the cost lower.

Furthermore, since the slot antenna is a type of suspended line feeding type in which a slot and a suspended line are combined, the feeding structure is simple, and the structure can be simplified and miniaturized.

〔Effect of the invention〕

As described above, according to the present invention, a substrate provided with a plurality of conductors for the power feeding section is disposed between the upper and lower plates, and a plurality of slots are provided in the upper plate in correspondence with each of the plurality of conductors. Therefore, the configuration is simple and the cost is low.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line 1-1 in FIG. 1, and FIG. FIG. 4 is a diagram of a parallel power supply circuit for circularly polarized waves according to the present invention, FIG. 5 is a diagram of a series and parallel power supply circuit for linearly polarized waves according to the present invention, and FIG. 6 is a diagram of a parallel power supply circuit for linearly polarized waves according to the present invention. il+ is the lower plate, (2) is the upper plate, (3)
is base (anti, (4) to (8) are suspended lines, (
9) is a feeding point, and ao3 αD is a slot.

Claims (1)

[Claims] A power supply unit and a substrate provided with a plurality of conductors for the power supply unit are disposed between upper and lower plates, and a plurality of slots are provided at predetermined intervals in the upper plate in correspondence with each of the plurality of conductors. A flat antenna characterized by: