JPH0797727B2 - Planar array antenna - Google Patents

Description

TECHNICAL FIELD The present invention relates to a planar array antenna suitable for use in, for example, mixing for receiving satellite broadcasts.

[Outline of Invention]

The present invention removes and removes a radiating element disposed near the central portion of a suspended line-fed planar antenna in which a large number of holes, radiating elements composed of excitation probes and suspended lines are arranged in parallel. In a planar antenna configured to provide a feeding point at a position,
By providing a power feed unit on the back of the antenna in a waveguide configuration and integrating a converter having a waveguide input structure along the back of the antenna in a thin shape, the antenna can be easily attached and the degree of freedom of attachment can be increased. This makes it easy to keep mechanical conditions such as wind pressure load safe, is less susceptible to the effects of snow, and does not require a large space for installation.

[Conventional technology]

In general, a satellite broadcasting receiving system is configured by a receiving antenna, a low noise converter, a connecting cable arranged outdoors, and a receiver installed indoors which is electrically coupled by the connecting cable. Or receive voice. A parabolic antenna is usually used as the receiving antenna, and a primary radiator for extracting the radio waves collected by the reflecting mirror and a low noise converter following the primary radiator are arranged at the focal point.

On the other hand, in order to receive satellite broadcasting, the present applicant removed the radiating element in the approximate center of a suspended line-fed planar antenna in which a large number of radiating elements consisting of a large number of holes, an excitation probe and a suspended line were arranged in parallel. By providing a feeding point on the back side of the removed position, the transmission loss of the feeding line is reduced, and an inexpensive high gain planar array antenna with a simple structure was previously proposed (Japanese Patent Application No. 61-63176).
issue).

[Problems to be solved by the invention]

By the way, when an antenna such as a parabolic antenna is used as an antenna for receiving satellite broadcasting, the equipment is arranged in a three-dimensional space, which makes it difficult to mount the antenna and keeps mechanical conditions such as wind pressure load safe. This is not easy and requires a lot of space, and since the primary radiator and the low noise converter are arranged on the curved surface and the space, there is a drawback that the performance is deteriorated due to the influence of snow and the like.

The present invention has been made in view of the above circumstances, and proposes a planar array antenna capable of eliminating the above-mentioned various drawbacks by integrating the above-described planar array antenna and a converter.

[Means for solving problems]

The planar array antenna according to the present invention comprises metal plates (or metallized plastic plates) (9) and (10) each having a hole (12) and a through hole (13) forming a part of a radiating element,
The metal plate (9) and (10) are sandwiched between the holes (12).
And a pair of excitation probes (23) protruding by a predetermined length in the direction of the center of the circle formed by the through holes (13) and having an angle difference of approximately 90 °.
A thin film substrate (11) consisting of a conductor foil (23) communicating with the pair of excitation probes (23) and a conductor foil (23) attached to the thin film substrate (11). A radiating element having a suspended line in which a cavity communicating with the holes (12) and the through holes (13) of the plates (9) and (10) is formed, and the metal plates (9) and (10) and A large number of radiating elements arranged in parallel on a thin film substrate (11) constitute a suspended line-fed planar antenna, and the radiating element in the substantially central portion of the radiating elements arranged in parallel is removed, and the feeding section is provided on the back surface of the removed radiating element. Providing (14) with a waveguide configuration,
The converter (1) having a waveguide input part connectable to the waveguide of the power feeding part (14) is made thin along the back surface of the metal plate (9) having the hole (12). It is a planar array antenna characterized in that it is integrated with.

[Action]

A feeding part (output part) (14) connected to an exciting probe provided corresponding to a large number of holes (12) and (13) by a suspended line is formed in a waveguide and is provided on the back surface of the antenna. On the other hand, the input part (2) of the converter (1) has a waveguide structure, and the converter is provided along the rear surface of the antenna by aligning the power supply part and the input part so as to be electrically connected. As a result, it is possible to integrate thin units, simplifying the structure and stabilizing the characteristics.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows an example of a converter used in this embodiment. FIG. 1A is a top view thereof, and FIG. 1B is a back surface (antenna mounting surface) view thereof. In FIG. 1, (1) is the converter body ,. An input part (2) for connecting to the planar array antenna is provided on the upper part thereof. The input section (2) has a waveguide structure, and a flange (3) for mounting is provided around the waveguide section. Screw holes (4) for mounting are provided at the four corners of the flange (3), but the part located on the converter body (1) side cannot be screwed into it, so it should be positioned as a hole. , For example, the convex portion (4a) of a hemisphere. A conversion probe (5) connected to a circuit inside the converter body (1) projects inside the input section (2). (6) is the converter body (1)
Is a mounting band for fixing to the planar array antenna, and has screw holes (7) at both ends thereof. Further, (8) is an output connector to which a gable is connected.

FIG. 2 shows the procedure for mounting the converter on the planar array antenna. FIG. 2A shows the planar array antenna as seen from the back surface (converter mounting surface), and FIG. 2B shows the converter mounted on the planar array antenna. The state is viewed from the side.

The planar array antenna includes a first metal plate (or metallized plastic plate) (9), a second metal plate (or metallized plastic plate) (10), and first and second metal plates (9), (10). ), A thin film substrate (film-like flexible substrate) (11) is provided. The first metal plate (9) has a concave hole (12), and the second metal plate (1)
0) has a through hole (13) which penetrates vertically through the same passage as the hole (12) and has a conical shape on the upper side. When the substrate (11) is sandwiched between the first and second metal plates (9) and (10), the hole (1
Positioned so that 2) and (13) match.

The substrate (11) is coated with a conductor foil (24) having a predetermined shape as shown in only one place in FIG. 2A, and the conductor foil (24) is provided along the conductor foil (24) with first and The second metal plates (9) and (10) are connected through a cavity (not shown) formed in the second metal plates (9) and (10) to form a suspended line. In addition, the conductor foil (24) is projected on the common plane of the substrate (11) by a predetermined length so as to be orthogonal to the central directions of the holes (12) and the through holes (13), and a pair of excitation probes (23) are attached. Constitute. Further, one radiating element in the central portion is removed, and a feeding portion (14) having a waveguide structure is provided here. This feeding part (14) penetrates the back side (left side in FIG. 2B) of the planar array antenna, that is, the first metal plate (9).

The power supply section (14) exposed on the back surface of the first metal plate (9)
As shown in FIG. 2A, a cutout portion (15) having a shape corresponding to the flange (3) is provided around the cutout portion (15), and the cutout portion (15) is dug down by substantially the thickness of the flange (3). Also,
Flange (3) at 3 of the 4 corners of the notch (15)
A screw hole (16) is provided corresponding to the screw hole (4), and a concave portion (16a) corresponding to the convex portion (4a) of the flange (3) is provided at the remaining one place. A conversion probe (17) connected to the conductor foil projects inside the power supply section (14). In addition, a screw hole (18) is provided on the back surface of the first metal plate (9) corresponding to the screw hole (7) of the mounting band (6), and the first metal plate (9) is attached to the second hole. A plurality of screw holes (19) are provided for fixing to the metal plate (10). Of course, screw holes are provided in the substrate (11) and the second metal plate (10) corresponding to the screw holes (19).

Now, in order to attach the converter to the planar array antenna, the converter body (1) is placed along the back surface of the first metal plate (9), the flange (3) is inserted into the notch (15), and the convex portion (4a) is placed. And the recess (16a) are engaged with each other for positioning. Then, the screw holes (4) and (16) and the screw holes (7) and (18) come to be aligned with each other, and then screwed to them. As a result, the conversion probe (5) in the input section (2) corresponds to the conversion probe (17) of the power feeding section (14), and the planar array antenna and the converter are electrically connected.

FIG. 3 shows a state in which the mounting cover (20) and the radome (21) are mounted on the planar array antenna to which the converter is mounted. FIG. 3A is a side view thereof, and FIG. 3B is a rear view thereof. is there. As the mounting cover (20), a plastic having good weather resistance such as reinforced plastic is used, and as the radome (21), plastic having little attenuation of high frequency and good weather resistance is used. The second metal plate (1
A certain amount of air gap is provided between 0) and the radome (21) to reduce reflection loss. It should be noted that although the above embodiments have been described as radiating elements, it is clear that these act as receiving elements according to the reversible principle of the antenna.

〔The invention's effect〕

As described above, according to the present invention, the power feeding portion is provided on the back surface of the antenna in a waveguide structure, and the converter having the waveguide input structure is thinly integrated along the back surface of the antenna. For an antenna structure such as a parabolic antenna, the antenna can be easily mounted, the degree of freedom in mounting is increased, and mechanical conditions such as wind pressure load can be maintained safely. Further, since the antenna surface is substantially only the planar array antenna part, it is not easily affected by snow and does not require a lot of space for installation.

[Brief description of drawings]

FIG. 1 is a top view and a back view showing an example of a converter according to the present invention, FIG. 2 is a rear view and a side view showing an embodiment of the present invention, and FIG. 3 is a side view showing an overall configuration according to the present invention. FIG. (1) is the converter body, (2) is the input part, (3) is the flange, (6) is the mounting band, (9) is the first metal plate (or metallized plastic plate), and (10) is the second. The metal plate (or metallized plastic plate), (11) is a substrate, (12) and (13) are holes, and (14) is a power feeding unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 59-103406 (JP, A) JP 59-207706 (JP, A) JP 58-77306 (JP, A) Actual 60- 155208 (JP, U)

Claims (1)

[Claims] 1. A metal plate (or a metallized plastic plate) having a recessed hole and a through hole which form a part of a radiating element, and a metal plate sandwiched between the metal plate, the hole and the through hole being formed. A pair of excitation probes protruding by a predetermined length with an angle difference of approximately 90 ° in the center direction of the circle, a thin film substrate made of a conductor foil communicating with the pair of excitation probes, and a conductor attached to the thin film substrate. A radiating element having a suspended line in which a cavity communicating with the hole and the through hole of the metal plate is formed so as to surround the foil, and a large number of the radiating elements are arranged side by side on the metal plate and the thin film substrate. To form a suspended line feed type planar antenna, remove the radiating element in the approximate center of a large number of radiating elements arranged in parallel, and provide a feeding section on the back surface of the removed radiating elements in a waveguide configuration. Guidance of department Planar array antenna characterized by comprising integrated thin so along toward the downward direction converter having a waveguide input portion connectable to the tube to the back of the metal plate having the bore.