JP2629197B2 - Circularly polarized array antenna - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circularly polarized array antenna suitable for receiving satellite broadcasts, for example.

[Summary of the Invention]

The present invention relates to a suspended line fed planar antenna, wherein at least one pair of positioning pins is provided on metal or metallized plastic, and a hole is provided on the substrate to engage with the pair of positioning pins, so that either right-handed or left-handed circularly polarized wave is provided. By selectively supplying power to the components, the mechanical components and the like can be configured to be compatible with both polarizations with the same configuration, so that the components can be shared and shared and the cost can be reduced.

[Prior art] In general, it is known that satellite broadcasting is broadcast in circularly polarized waves.
7) Determined by the World Radio Administration Conference on Satellite Direction. Radio waves of satellites in the same geosynchronous orbit use left-handed or right-handed circularly polarized waves depending on the even or odd channels, and the isolation between the two polarizations is at least as low as, for example, 25 dB. And it is limited so that the antenna setting is easy. For example, Japan uses right-handed circularly polarized waves.

[Problems to be solved by the invention]

By the way, in Europe, the West German satellite TV-SAT is left-handed circularly polarized, the French satellite TDF-1 is right-handed circularly polarized, and the satellite orbital positions are the same and the frequencies used are 11.7-1.
Same band as 2.1GHz.

Therefore, as antennas corresponding to these satellites, those capable of simultaneously receiving both polarizations and those capable of switching are desirable, and those corresponding to each polarization are also preferable.
Since the antenna is for the same band, one antenna configuration that can cope with both is desirable in order to reduce costs and the like.

The present invention has been made in view of such a point, and provides a circularly polarized array antenna that can cope with either right-handed or left-handed circularly polarized waves with one antenna configuration.

[Means for solving the problem]

The circularly polarized array antenna of the present invention is a pair of metal or metallized plastic plate members having at least one of a plurality of holes forming a part of the circularly polarized radiation element,
In a suspended line supply type planar antenna that sandwiches a thin film substrate on which a suspended line is formed, a positioning pin is provided on one side of the metal or metallized plastic plate member, and a positioning pin is provided on the other side of the plate member. An engagement hole is provided at a position corresponding to the pin,
The substrate has a first hole that can be engaged with the positioning pin while the substrate is sandwiched on one surface, and a first hole that can be engaged with the positioning pin while being sandwiched on the other surface of the substrate. A second hole is provided, and either the right-handed or left-handed circularly polarized wave can be selectively supplied by selecting the front and back of the surface of the substrate.

[Action]

One of a pair of metal or metallized plastic (1,
21) is provided with at least a pair of positioning pins (9, 10, 31, 32), and corresponding to the positioning pins, at least a pair of holes (11, 12, 33, 32) are formed in the other metal (2, 22) of metal or metallized plastic. 34) is provided. Of course, one metal or metallized plastic may be provided with a positioning pin and a hole, and correspondingly, the other metal or metallized plastic may be provided with a hole and a positioning pin. Also, a substrate sandwiched between a pair of metal or metallized plastic (3,23)
The holes (13 to 16, 35, 35)
~ 38). And when the substrate is sandwiched between a pair of metals or metallized plastics with the pattern surface facing out, the antenna is for right-handed circularly polarized light, and when the substrate is turned over and sandwiched between a pair of metals or metallized plastics, the antenna is for left-handed circularly polarized light. Becomes As a result, the components can be shared and shared, and the cost can be reduced.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a configuration diagram (top view) for right-handed circular polarization, FIG. 2 is a side view thereof, and FIG. It is a block diagram (top view) for left-hand circularly polarized waves.

First, an outline of the configuration of the circularly polarized wave radiation element used here will be described. This circularly polarized radiating element is typically composed of a first metal plate (or metallized plastic plate) (1),
Metal plate (or metallized plastic plate) (2),
It is composed of a thin film substrate (film-like flexible substrate) (3) sandwiched between the first and second metal plates (1) and (2). The first metal plate (1) has a recessed hole, and the second metal plate (2) has a hole having the same diameter as the hole and penetrating vertically and having a conical upper side. When the substrate (3) is sandwiched between the first and second metal plates (1) and (2), the holes are positioned so that both holes coincide with each other. In addition, the first and second
When the substrate (3) is sandwiched between the metal plates (1) and (2), a cavity communicating with both holes is formed.

The conductor foil (4) attached to the substrate (3) is connected through a cavity to form a suspended line. Also,
The conductor foil (4) projects a predetermined length on a common plane of the substrate (3) so as to be orthogonal to the center direction of both holes, and forms a pair of excitation probes (5) and (6). With this configuration, the circularly polarized waves are obtained by combining linearly polarized waves that are orthogonal to each other with the transfer shifted by π / 2, so that excitation probes corresponding to the respective linearly polarized components are provided.

Please refer to Japanese Patent Application No. Sho 60
See -162650.

FIG. 1 shows a circuit configuration in which a plurality of circularly polarized radiating elements as described above are supplied in co-phase with a suspended line, thereby forming an array. At this time, the first and second metal plates (1) and (2) are provided with a plurality of holes respectively corresponding to the radiating elements, and the excitation probes (5) and (6) of the respective radiating elements are suspended. The conductor foils (4) constituting the lines are interconnected so as to be equidistant from the feeding point (8) of the feeding part (7). In such a configuration, various directional characteristics can be obtained by changing the power supply phase and the power distribution ratio to the line. That is, the phase is changed by changing the distance from the feeding point (8) to the excitation probes (5) and (6), and the lines of the suspended lines are thinned or thickened. By changing the impedance ratio, the amplitude changes, whereby the directional characteristics can be arbitrarily changed.

In this embodiment, as shown in FIGS. 1 and 2, a pair of positioning pins (9) and (10) are provided at predetermined positions of the first metal plate (1), for example, on a diagonal line. Correspondingly, a pair of holes (11) and (12) are provided in the second metal plate (2), respectively. The substrate (3) is provided with a pair of holes (13) and (14) corresponding to the pair of positioning pins (9) and (10), respectively. When the substrate (3) is turned upside down for the left-handed circularly polarized wave (in the case of FIG. 3), another pair of holes (9) and (10) correspond to the pair of positioning pins (9) and (10). 15) and (16) are provided.

When assembling, the substrate (3) is placed so that the holes (13) and (14) are aligned with the positioning pins (9) and (10) of the first metal plate (1), respectively. The second metal plate (2) is covered so that the holes (11) and (12) engage with the positioning pins (9) and (10), respectively. This constitutes an array antenna for right-handed circularly polarized waves.

In order to construct an array antenna for left-handed circular polarization, the second metal plate (2) is removed from the state of the array antenna for right-handed circular polarization, and the substrate (3) is arranged as shown in FIG. Turn it over. Then, the positioning pins (9) and (10) of the first metal plate (1) and the holes (15) and (16) of the substrate (3) respectively come into engagement with each other. Then, the second metal plate (2) is again put on the first metal plate (1) from above the substrate (3). Of course, at this time, the positioning pins (9) and (10) of the first metal plate (1) and the holes (11) and (12) of the second metal plate (2) respectively engage with each other in a right-handed circularly polarized state. This is the same as the wave array antenna. As a result, an array antenna for left-hand circular polarization is formed.

In this case, the substrate (3) is extremely thin (for example,
25 to 50 μm), there is no problem in characteristics even when used upside down.
In addition, when the substrate (3) is turned over, both metal plates (1) and (2) are provided with cuts of a suspended line shape so that the excitation probes (5) and (6) pass therethrough.

As described above, in the present embodiment, array antennas for right-handed circular polarization and left-handed circular polarization can be configured simply by turning over the substrate (3), and components can be shared, shared, and cost can be reduced.

4 to 7 show a second embodiment of the present invention. FIG. 4 is a configuration diagram (top view) for right-handed circular polarization, and FIG. 5 is a line II in FIG. , FIG. 6 is a cross-sectional view taken along line II-II of FIG. 4, and FIG. 7 is a configuration diagram (top view) for left-hand circularly polarized waves.

First, an outline of the configuration of the circularly polarized wave radiation element used here will be described. This circularly polarized radiating element is typically composed of a first metal plate (or metallized plastic plate) (21),
Metal plate (or metallized plastic plate) (22),
A thin-film substrate (film-like flexible substrate) (23) sandwiched between the first and second metal plates (21) and (22). The first metal plate (21) has a convex holding portion (24) for holding the substrate (23), and the second metal plate (22) has, for example, a so-called slot-shaped hole having a diameter of 14 mm. It has a hole (25) and a convex holding portion (26) provided around the hole for holding the substrate (23). First and second metal plates (2
When holding the substrate (23) between (1) and (22),
Positioning is performed so that 4) and (26) coincide. In addition,
At this time, the thicknesses of the first metal plate (21) and the second metal plate (22) are very thin, for example, about 2 mm each.
In addition, the first and second metal plates (21) and (22) are used for the substrate (2).
A cavity (27) communicating with the hole (25) is formed when the 3) is sandwiched.

(28) is the hole (25) of the second metal plate (22) in the substrate (23)
A conductor foil as a so-called patch-shaped surface-resonant printed element which is concentrically attached to the hole (25) corresponding to the hole (25), and the conductor foil (28) is provided through a cavity (27). Connected to form a suspended line. In this case, the conductor foil (28) having a substantially circular shape has a diameter that resonates at a predetermined frequency, and a notch facing a position at a predetermined angle, for example, 45 ° with respect to the suspended line in order to receive or transmit circularly polarized waves. (28a) and (28b) are provided.

Please refer to Japanese Patent Application No. Sho 62
See -19071.

FIG. 4 shows a circuit configuration for feeding a plurality of circularly polarized radiating elements as described above in a common-phase manner using a suspended line, thereby forming an array. The solid line portion in FIG. 5 shows a state cut along the line II in FIG. 4, and the broken line portion in FIG. 5 covers the state shown in FIG. 4 with the second metal plate (22) from above. It shows the state where it was turned on. Similarly, the solid line portion in FIG. 6 shows a state cut along the line II-II in FIG. 4, and the broken line portion in FIG. 6 shows the state shown in FIG. This shows a state of being covered.

Here, a holding portion (24) for holding the substrate (23) is provided in the first metal plate (21) around the hole (25) formed in the second metal plate (22). . In addition, metal plate (21)
A holding part (24) for holding the substrate (23) is also provided around a power supply part (29) penetrating through the substrate. Further, a holding portion (24) is provided also on the outer peripheral portion of the array. Other parts constitute the cavity (27). As a result, a plurality of conductive foils (28) may pass through the same hollow portion (27), and there is a concern about mutual connection. However, the interval between the conductive foils (28) and the upper and lower walls of the hollow portion (27) may be different. By properly selecting the interval, necessary isolation can be obtained, and there is no problem. At this time, since the lines of electric force concentrate on the upper and lower walls of the cavity (27), the supporting substrate (2
There is almost no electrolysis according to 3), which reduces the dielectric loss and consequently the line transmission loss.

Further, a holding portion and a hollow portion are also formed on the second metal plate (22) corresponding to the first metal plate (21). That is, the holding portion (26) is provided around the hole (25) formed in the second metal plate (22), around the power supply portion (the upper surface is closed) and around the array. The portion is a cavity (27) (see FIG. 5).

The substrate (23) is uniformly held by the holding portions (24) and (26) provided in this manner, without sagging, and the surroundings of each radiating element, the feeding portion, etc. are the same as those of the conventional case. Since (21) and (22) are in close contact, resonance at a specific frequency does not occur.

In FIG. 4, the 16 radiating elements are divided into _four groups G _{1 to} G ₄ with _four as one set. Connection point P _{1 of} each group
Is shifted from the center by λg / 2 (λg is the line wavelength at the center frequency), and the connection points P ₂ and P ₃ are connected by being shifted by λg / 4. As a result, in each group, the lower right radiating element is 90 ° relative to the upper right radiating element, and the lower left radiating element is 18 °.
The radiating elements at 0 ° and at the upper left will be 270 ° out of phase, respectively, thereby improving the axial ratio. That is,
By changing the spatial phase and the feeder phase, the axial ratio is broadened.

The connection point P ₁ and P ₄ to P ₆ for each group feeding section (2
They are interconnected so that they are equidistant from the feed point (30) in 9). In such a configuration, the connection points P ₁ and P ₄ ~
It is possible to obtain various directivity characteristics by changing the position of the P ₆ changing the feeding phase and the power distribution ratio. That is, the phase is changed by changing the distance from the feed point (30) to the connection point P ₁ and P ₄ to P _6, also, or, or thicker thin line where branches of the suspended line By changing the impedance ratio, the amplitude changes, whereby the directional characteristics can be changed arbitrarily.

In the present embodiment, as shown in FIG. 4, a pair of positioning pins (31) and (32) are provided at predetermined positions on the first metal plate (21), for example, on a diagonal line. Correspondingly, a pair of holes (33) (not shown) and (3) are formed in the second metal plate (22), respectively.
4) (See Fig. 6). Further, a pair of holes (35) and (36) are provided in the base material (23) corresponding to the pair of positioning pins (31) and (32), respectively. The board (2
In 3), when the substrate (33) is turned upside down for the left-handed circularly polarized wave (in the case of FIG. 7), a pair of positioning pins (31) and (3) are used.
Another pair of holes (37) and (38) are provided corresponding to 2).

When assembling, the substrate (23) is placed so that the holes (35) and (36) are aligned with the positioning pins (31) and (32) of the first metal plate (21), respectively. The holes (33) and (34) of the second metal plate (22) are covered so as to engage with the positioning pins (31) and (32), respectively. This constitutes an array antenna for right-handed circularly polarized waves.

Further, in order to construct an array antenna for left-handed circular polarization, the second metal plate (22) is removed from the state of the array antenna for right-handed circular polarization, and the substrate (23) is placed as shown in FIG. Turn it over. Then, the positioning pins (31) and (32) of the first metal plate (21) and the holes (37) and (38) of the substrate (23) respectively engage with each other. Then, the second metal plate (22) is again put on the first metal plate (21) from above the substrate (23). At this time, the positioning pins (31) and (32) of the first metal plate (21) and the holes (33) and (34) of the second metal plate (22) respectively engage with the right-handed eccentric circle. This is the same as the wave array antenna. As a result, an array antenna for left-hand circular polarization is formed.

Also in this case, since the substrate (23) is extremely thin (for example, 25 to 50 μm), there is no problem in characteristics even if it is used upside down.

As described above, in the present embodiment as well, an array antenna for right-handed circularly polarized light and left-handed circularly polarized light can be configured by simply turning over the substrate (23), and components can be shared, shared, and the cost can be reduced.

Further, in the present embodiment, it is not necessary to provide a suspended line-shaped cut in both metals so that the probe passes when the substrate is turned over as in the first embodiment. To use it, simply turn the substrate (23) upside down.

In the above embodiment, the first metal plate is provided with a pair of positioning pins, and the corresponding second metal plate is provided with a pair of holes. However, the first metal plate is provided with a pair of positioning pins and holes. May be provided, and a hole and a positioning pin may be provided in the second metal plate in response to this. In addition, the pair of positioning pins are located on the diagonal line. However, the present invention is not limited to this. The positioning pins may be located at any position, for example, a position slightly shifted from the diagonal line or on a straight line. Further, the number of the positioning pins is not limited to a pair, and may be more.

〔The invention's effect〕

According to the present invention as described above, at least a pair of positioning pins are provided on a metal or metallized plastic,
The board is provided with a hole that engages with a pair of positioning pins, so that either right-handed or left-handed circularly polarized power can be selectively supplied. It is also possible to cope with the common use and common use of parts, reduce the cost, and be advantageous in terms of serviceability and manufacturing.

[Brief description of the drawings]

FIGS. 1 and 3 are block diagrams showing one embodiment of the present invention.
FIG. 2 is a side view, FIGS. 4 and 7 are diagrams showing another embodiment of the present invention, and FIGS. 5 and 6 are diagrams taken along lines II and II-II of FIG. 4, respectively. It is sectional drawing. (1) and (21) are first metal plates (or metallized plastic plates), (2) and (22) are second metal plates (or metallized plastic plates), (3) and (23) are substrates,
(9), (10), (31), (32) are positioning pins, (1
1), (12), (33), and (34) are holes in the second metal plate,
3), (14), (15), (16), (35), (36), (3
7) and (38) are holes in the substrate.

 ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-15902 (JP, A) JP-A-62-210703 (JP, A) JP-B-57-59682 (JP, B2) IEICE Technical Report Vol. . 86, no. 132 (A.P86-57) P. 5-10, August 22, 1986

Claims (1)

(57) [Claims] 1. A thin-film substrate on which a suspended line is formed is sandwiched between a pair of metal or metallized plastic plate members having at least one of a plurality of holes forming a part of a circularly polarized wave radiating element. In the suspended line supply type planar antenna, a positioning pin is provided on one side of the metal or metallized plastic plate member, and an engagement hole is provided at a position corresponding to the pin on the other side of the plate member, The substrate has a first hole that can be engaged with the positioning pin while the substrate is sandwiched on one surface, and a first hole that can be engaged with the positioning pin while being sandwiched on the other surface of the substrate. And a second hole, and by selecting the front and back of the surface of the substrate, it is possible to selectively supply either right-handed or left-handed circularly polarized waves. Circularly polarized array antenna.