JPS58147204A - Antenna feeding device - Google Patents

Abstract

PURPOSE:To obtain a thin, lightweight feeding device for an array antenna by providing a coupled antenna constituted on a dielectric substrate at the feeding terminal of an element antenna and also coupling strip lines constituted on the dielectric substrate. CONSTITUTION:On the surface of the dielectric substrate 7, numbers of strip lines 8 are printed and on the reverse surface, metal 9 is provided. A dielectric substrate 10 is adhered to the reverse metallic surface 9 of the substrate 7 and on the substrate 10, a feeding circuit for power distribution to lines 8 is printed. On a dielectric substrate 12, a dipoles 11 are printed, the substrate 12 stand upright on the substrate 7, and the dipoles 11 are arranged closely in parallel to the lnes 8. Then, electric power from an input terminal 21 is fed the starting terminals 13 of the lines 8 through strip lines 20 and through hole conductors 15 and then fed to the ending terminals 14. The dipoles 11 couples halfway with the magnetic field of the lines 8 to pick up some of the electric power, which is supplied to the element antenna side through the strip lines 19. Thus, the thin, lightweight feeding device is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna power supply device for supplying and distributing power to each element antenna of an array antenna consisting of a plurality of element antennas, and particularly provides a thin and lightweight power supply device.

Conventionally, there have been various methods for feeding power to array antennas, and nine typical ones are shown in FIGS. 1 and 2. The system shown in FIG. 1 is called a cohort power feeding system, in which power from a power source (1) is divided into two parts by a feed line (2) K in a tournament manner and is then fed to each element antenna (3).

In addition, Fig. 2 is called a space feeding system, in which the power of the power source (11) is radiated into space by the horn antenna (4), then received by the receiving element antenna (5), and then connected to the feed line (6). In particular, when such a conventional system is used as a power feeding device for an array antenna mounted on an aircraft, the following problem occurs.

In other words, when mounted on an aircraft, it is necessary to make the power supply device lightweight, but in the case of the cohort power supply system shown in Figure 1, the power supply circuit is extremely complicated in the case of an array antenna with two normal element antennas of about 10'-10''. It becomes diverse and complicated, and the weight increases.

In addition, although there is a limit to the space occupied by the power feeding device when installed on an aircraft, in the space feeding system shown in Figure 2, as is clear from Figure 9, the horn antenna (4) and the receiving element antenna (5)
Requires a large space between them.

Further, in this space power supply system, distribution of power is difficult, and for example, uniform distribution of power cannot be achieved.

The present invention provides a thin and lightweight power supply device that eliminates the conventional drawbacks, and will be explained below with reference to nine drawings.

FIG. 3 is a schematic diagram of the power supply device according to the present invention.
7) is a dielectric substrate, on the front surface of which many strip lines (8) are printed, and on the back surface is a metal surface (9). (10) is a second dielectric substrate, which is closely attached to the metal surface (9) on the back side of the first dielectric substrate (7), and this dielectric substrate (a) supplies power to each strip line (8). A power supply circuit for power distribution is printed. The configuration of this power supply circuit will be described later. Further, α1) is a dipole printed on the dielectric plate substrate (2). The dielectric substrate α2 stands perpendicular to the dielectric substrate (7), and is located parallel to and close to the dipole (111) and IJ tube line (8).

FIG. 4 is a circuit configuration diagram of a strip line (8) constructed on a dielectric substrate (7). αJ is a strip line (
8), Q4 is also the terminal.

FIG. 5 is an enlarged cross-sectional view of the input end (end).

The end of the strip line (8) is connected to the strip line αe on the dielectric substrate α on the back side by a through-hole conductor α9. ing. The shaded areas in FIG. 5 indicate metal parts. Moreover, FIG. 6 is an enlarged view of the terminal end 04) of the strip line (8), where αη is a chip resistance.

(181 is a through-hole conductor that is electrically connected to the metal surface (9) on the back side of the dielectric substrate (7).

FIG. 7 is an enlarged view of the coupling portion between the strip line (8) and the dipole αl). Dipole h is dielectric substrate a2
It has a configuration in which half of each side is printed on the front and back sides of the line, and it is connected to the strip line (11).

Figure 8 shows a cohort power supply circuit using a strip line (to) constructed on the back side of a dielectric substrate Ql.

＠ is an input end, and Ｚ is a power supply end connected to the through-hole conductor (2) in FIG.

The antenna device according to the present invention is configured as shown in Figs. 8) and flows toward the terminal end Q4. Along the way, the dipole aυ is connected to the strip line (
8), a part of the power is pick-amplified, and the power is supplied to the element antenna (not shown here) through the strip line (9).

By appropriately selecting the distance between the dipole Qll and the strip line (8), the magnitude of the coupled power can be adjusted, and therefore, it is possible to achieve, for example, a uniform amplitude distribution required for an array antenna. Further, the power supply device is mainly composed of two dielectric substrates (7) and a wire.

It has an extremely thin and lightweight structure.

In addition, in FIG. 7, in order to maintain the desired spacing between the dipole (11) and the strip line (8), the dielectric substrate (
It is possible to take a substrate portion of the required size below the dipole circle in (b) and attach it by pressing its end surface against the surface of the dielectric substrate (7) as shown in FIG. In this case, the relative positional relationship between the two dielectric substrates (7) and 02 is determined by cutting a groove in the dielectric substrate (7) parallel to the strip line (8) and fitting the dielectric substrate opening into this groove. It can be fixed.

Moreover, the same effect can be obtained by using a loop element (c) as shown in FIG. 9 instead of the dipole αD. In Figure 9, the company is a rat race circuit made up of strip lines.

Above the dashed line, the back side of the dielectric substrate 04 is a metal surface, and below the line, there is no metal surface on the back side. Furthermore, a folded dipole may be used instead of the loop element.

Although the case has been described in which the cohort feed circuit of the strip line (■) in FIG. 8 is used as the circuit for feeding the plurality of strip lines (8) in FIG. 4, the present invention is not limited to this, and Instead of the circuit, a radial line type distribution circuit as shown in FIG. 10 can also be used.

That is, in FIG. 1θ, the power input from the coaxial input end (c) propagates in the radial direction through the parallel plate portion (to).

The parallel flat plate portion (a) flowing to (8) may be constructed of a dielectric substrate, or two hollow metal flat plates may be used to reduce loss. Furthermore, a radio wave absorber may be provided around the parallel plate portion (e).

In the above description, the case where the IJ tube line (8) is a straight line has been described; however, it is also possible to configure it in a curved line depending on the relationship between the line wavelength and the arrangement of the element antennas.

Furthermore, as shown in FIG. 11, a dielectric plate spacer (2) may be provided on the dielectric substrate (7), and the dielectric substrate 0 may be provided on this.

9. As an array antenna, the present invention can also be implemented in a phased array antenna in which a variable phase shifter is connected to each element antenna to electronically control the beam.

As described above, in the antenna power feeding device according to the present invention,
A dipole or loop is provided close to the IJ tube line constructed on a dielectric substrate.

By picking up power through electrical coupling, the power supply device can be made thin and lightweight, and the desired power distribution ratio can be selected.

When this is used in a power feeding circuit for an array antenna mounted on an aircraft, the effect is extremely large.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams of the conventional cohort power supply and space power supply, respectively, and Figure 3 is a schematic diagram of the present invention.
FIG. 4 is a schematic configuration diagram of a strip line group according to the present invention, and FIG.
The figure is an enlarged view of the input end of Fig. 4, Fig. 6 is an enlarged view of the terminal end of Fig. 4, Fig. 7 is a diagram showing the relative relationship between the strip line and the dipole, and Fig. 8 is a diagram of the cohort feeder circuit. 9 is a schematic diagram of the present invention when a loop element is used, FIG. 10 is a schematic diagram of a radial line type distribution circuit, and FIG. 11 is a diagram of the present invention when a dielectric spacer is used. It is a schematic block diagram. In the figure, (3) is an element antenna, and (7) is a dielectric substrate. (8) is S) IJ tube line, (II is dielectric substrate,
01) is a dipole, C2 is a dielectric substrate, 031 is an input end, C4 is a termination, C51 and C81 are through-hole conductors, α is a step resistor, shout is S) IJ tube line, @ is a feed end, (c) is a loop element, C114) is a rat race circuit, a! ! 9 is the coaxial input end, c! BH parallel plate part,
C8 is a dielectric spacer. In FIG. 2, the same or corresponding parts are designated by the same reference numerals. Agent Makoto Kuzuno - GI Toyo II I! l Figure 4 Figure 6゛・+ +---= +7 Figure 7 Figure 9 Figure 10) 16 5

Claims (5)

[Claims] (1) In an antenna power feeding device that distributes or combines power to a plurality of element antennas constituting an array antenna, a coupling antenna configured on a dielectric substrate is provided at the feeding end of each element antenna, and the coupling antenna An antenna power feeding device characterized in that a strip line configured on a dielectric substrate is provided adjacent to the antenna, and power is distributed or combined to each of the element antennas by coupling the coupling antenna and the strip line. (2) Dipole antenna as a coupling antenna. Claim (1) characterized in that either a loop antenna or a folded dipole antenna is used.
Antenna power feeding device as described in . (3) A dielectric substrate on which a coupled antenna is configured. S) Between the dielectric substrate on which the IJ tube line is constructed,
The antenna power feeding device according to claim (1), characterized in that a dielectric spacer is provided. (4) S) Claim (1) characterized in that a groove is provided in the dielectric substrate on which the IJ tube line is formed, and a coupling antenna is formed in this groove, and then the dielectric substrate is fitted.
Antenna power feeding device as described in . (5) The antenna power feeding device according to claim (3), wherein a groove is provided in the dielectric spacer, and a dielectric substrate on which a coupled antenna is formed is fitted into the groove.