JPH02305002A - Antenna system - Google Patents

Abstract

PURPOSE:To simplify complicated connection and to reduce the cost of the antenna system by forming a microstrip antenna on the same hoard as a converter circuit, and arranging a dielectric lens to the upper part of the microstrip antenna. CONSTITUTION:A converter circuit 13 including an amplification HEMT 12 is formed on a board 11, and a microstrip antenna 14 connecting electrically to the converter circuit 13 with a conductor pattern is formed on the board 11. That is, the microstrip antenna 14 is constituted by using the same board 11 as the converter circuit 13. Moreover, a dielectric lens 15 is arranged above the microstrip antenna 14. The dielectric lens 15 is shaped to converge the radio wave into the microstrip antenna 14. Thus, the connection with the converter circuit 13 is facilitated and thin profile is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna device suitable for use as a primary radiator of a satellite broadcast receiving antenna, in particular:
The present invention relates to an antenna device that can simplify the connection structure with a converter device.

[Conventional technology]

BACKGROUND OF THE INVENTION Conventionally, an offset parabolic antenna is well known as a satellite broadcasting antenna device. FIG. 2 is a schematic cross-sectional view for explaining an example of such an offset parabolic antenna. By arranging the primary radiator 2 at a position away from the path (indicated by arrow A) through which electromagnetic waves enter the parabolic antenna 1, deterioration of the radiation characteristics is prevented. This type of primary radiator 2 is required to have relatively sharp directivity characteristics, as shown by the dashed line B.

Therefore, conventionally, as the -order radiator 2, a horn antenna 3 shown in FIG. 3(a) and a helical antenna 4 shown in FIG. 3(b) have been used. The horn antenna 3 includes a horn section 3a and a circularly polarized wave linearly polarized wave converting section 3b.
It is coupled to a converter 6 via a waveguide converter 5 .

On the other hand, the helical antenna 4 has a structure in which a helical conductor 4b is arranged within a cylindrical case 4a, and is directly coupled to the converter device 6. Note that 7 indicates a reflecting plate, which is attached to the front surface of the converter device 6 in order to prevent radio waves from leaking to the rear of the helical antenna.

[Technical problems that the invention attempts to solve! ! ! Problem] In the horn antenna 3 and helical antenna 4, the connection with the convergence device 6 is complicated, and as is clear from the shapes shown, they use a conical horn or a cylindrical case, so the -order radiator had to become extremely bulky.

Therefore, an object of the present invention is to provide an antenna device that can be easily connected to a converter device and whose overall shape can be made smaller and thinner.

[Means for solving technical problems]

The antenna device of the present invention is characterized in that a microstrip antenna is formed on the same substrate as the substrate on which the converter circuit is mounted, and a dielectric lens is disposed above the microstrip antenna.

[Effect]

Since the converter circuit and the microstrip antenna are formed on the same substrate, not only is the connection with the converter circuit easy, but the device can also be made thinner. Furthermore, since the dielectric lens is combined with the microstrip antenna, the directivity characteristics can be improved by the dielectric lens.

[Explanation of Examples]

FIGS. 1(a) and 1(b) are a plan view and a sectional view of an embodiment of the present invention.

A converter circuit 613 including the amplifying HEMT 12 and having a circuit pattern shown by a broken line is configured on the substrate 11 . A microstrip antenna 4 is formed on this substrate 11 and is electrically connected to the converter circuit I3 through a conductive pattern.

That is, since the microstrip antenna 14 is configured using the same base fill as the converter circuit 13, it is prepared in a state where it is connected in advance by a conductive pattern or the like. Therefore, the connection between the microstrip antenna 14 and the converter circuit 13 is extremely easy.

The microstrip antenna 14 alone cannot achieve sharp directivity characteristics. Therefore, in this embodiment, the dielectric lens 15 is placed above the microstrip antenna. The dielectric lens 15 has a shape capable of converging radio waves onto the microstrip antenna 14, and may be made of dielectric synthetic resin, ceramics, or a composite material thereof.

In this embodiment, a dielectric lens 15 is fixed to a case 16 having an opening 16a so as to close the opening. However, by constructing the case 16 itself from a dielectric material, it is also possible to construct the dielectric lens 15 by a part of the case 16, that is, to integrate it with the case 16. In that case, the cost of the antenna device can be further reduced.

As is clear from FIG. 1(b), in this embodiment, the converter circuit 13 and the microstrip antenna 14 are configured on a single substrate 11, so the converter circuit 13 and the microstrip antenna 14! 4 can be integrated naturally and effortlessly, and the whole can be constructed very thinly.

In the above description, an embodiment has been described in which the antenna device is applied to a primary radiator of an offset parabolic antenna, but the antenna device of the present invention is not limited to the primary radiator as described above.
It should be pointed out that it can be applied to various uses.

〔Effect of the invention〕

In the present invention, since the microstrip antenna is formed on the same substrate as the converter circuit, and the dielectric lens is placed above the microstrip antenna, connection with the converter circuit is extremely easy. It becomes possible to effectively reduce the thickness and realize an antenna device with excellent directivity. Therefore, the complicated connection work with the converter circuit as in the case of conventional horn antennas and helical antennas can be simplified, and the overall shape is thinner and smaller.
It also becomes possible to reduce the cost of the antenna device.

[Brief explanation of drawings]

FIG. 1(a) is a plan view of an embodiment of the present invention, and FIG. 1(b) is a plan view of an embodiment of the present invention.
) is a sectional view of the same, FIG. 2 is a schematic sectional view of an offset parabolic antenna, and FIGS. 3(a) and 3(b) are perspective views showing a horn antenna and a helical antenna, respectively. In the figure, 11 is a base plate, 13 is a converter circuit, 1
4 is a microstrip antenna, and 15 is a dielectric lens. Figure 1

Claims (1)

[Claims] An antenna device comprising: a microstrip antenna formed on a substrate on which a converter circuit is mounted; and a dielectric lens disposed above the microstrip antenna.