JPH0629720A - Microwave converter - Google Patents

Abstract

PURPOSE:To simplify the microwave shield structure by storing dielectric circuit boards for horizontally and vertically polarized waves in an enclosure integrated with a horn antenna and placing an input part waveguide between both dielectric circuit boards. CONSTITUTION:The microwave inputted to a horn antenna 21 is transmitted to a waveguide and is inputted to a first dielectric circuit board 26 in the circuit storage space formed by a second enclosure 24 and a first enclosure 22 for shield. An antenna part pattern for one of horizontally and vertically polarized waves is provided on the surface of this circuit board 26, and one polarized wave of an input wave is inputted to the first dielectric circuit board 26. A waveguide 23 is coupled to the rear part of the circuit board 26 in such form that the waveguide 23 is interposed between the circuit board 26 and a second dielectric circuit board 27, and a short frame 28 is provided for the purpose of obtaining an input return loss most suitable for the waveguide-micro strip line and a small conversion loss. The other polarized wave is inputted to the second dielectric circuit board 27 in the same manner and is converted to the waveguide micro strip line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave circuit, and more particularly to a microwave low noise down converter for dual polarization reception used for satellite broadcast reception.

[0002]

2. Description of the Related Art In recent years, satellite-based communication, video and music services have become widespread. Among these various services, in order to effectively use the frequency, two types of polarized waves, that is, a horizontally polarized wave and a vertically polarized wave, are used for the microwave transmitted from the satellite. In order to use such a service, the receiving side needs a microwave converter capable of receiving both polarized waves.

FIG. 3 shows an embodiment of a microwave converter which is conventionally used and which can receive both polarizations. Referring to the figure, the microwaves input from the horn antenna (1) receive the antennas (10a, 1a, 1a, 1a) corresponding to the horizontal polarization and the vertical polarization built in the housing (2).
0b) and introduced internally. Dielectric circuit boards (6) and (7) are built in the converter housing, and a low noise amplifier (not shown), a filter circuit (not shown), and a mixer circuit (not shown) formed on these boards. After converting the received radio wave into a UHF band signal and amplifying it with
It is sent from the connector (9). (5) is a short-circuit plate that short-circuits the waveguide (3), and (8) is a short-circuit rod.

In the above-described conventional microwave converter, in order to shield the low noise amplifier, the filter circuit, the mixer circuit, etc. on the dielectric substrate (6) (7), the second converter is further provided inside the housing (2). A housing (11) is provided, and the housing (11) is separated to ensure the performance.

[0005]

In the conventional microwave converter capable of receiving both polarizations, the low noise amplifier, the filter circuit, and the mixer circuit are shielded against microwaves in particular, so that each circuit block and bias circuit are shielded. We are trying to reduce the influence of the circuit, stabilize the circuit performance, and ensure performance.

By the way, the casing (11) for such a shield has a dielectric circuit board (6,
7), it is necessary to fix it by means of screwing or soldering, so that the structure of the mechanical parts of the microwave converter becomes complicated and the number of parts increases. Further, when considering mass production, there is a problem that the assembling work is complicated and the working time is long.

The present invention has been made in view of the above problems of the conventional structure, and an object thereof is to provide a converter having a simplified microwave shield structure.

[0008]

In order to achieve the above object, a microwave converter of the present invention, which is provided with a horn antenna and receives horizontal polarized waves and vertical polarized waves simultaneously, comprises:
A shield first casing integrally formed with a horn antenna, a second casing forming a space for accommodating a reception signal conversion circuit by the first casing, and one of the two casings installed in the circuit accommodating space. A first dielectric substrate that receives polarized waves; a second dielectric substrate that is installed in the circuit housing space at a distance from the first dielectric substrate; And an input section waveguide that follows the horn antenna and is supported by being sandwiched between the dielectric substrates.

[0009]

The shield of the dielectric substrate on which the circuit for converting the received microwave is formed is provided inside the casing by the casing in which the horn antenna is integrated. Since the dielectric circuit board is housed and the input waveguide is located between the two dielectric circuit boards, the assembly work of the separation shield case is simplified and the number of parts is reduced. is doing.

[0010]

1 shows a sectional view of an embodiment of the present invention, and FIG. 2 shows an external perspective view. Referring to FIG. 1, the first housing (22) and the second housing (24) form a shielded circuit storage space for microwave conversion between the first housing (22) and the second housing (24) in an assembled state.

A horn antenna (21) is integrally formed in the first housing (22), and the microwave input to the horn antenna is transmitted to the waveguide, and the circuit housing space generated by both housings. It is input to the first dielectric circuit board (26). On the surface of the first dielectric circuit board (26), an antenna part pattern (not shown) for one polarization is provided for horizontal and vertical polarizations, and one polarization of the input wave is 1 Input to the dielectric circuit board (26). A waveguide (23) is coupled to a back portion of the first dielectric circuit housing (26) in the circuit housing space so as to be sandwiched between the waveguide and the second dielectric circuit board (27), which will be described later. A short rod (28) is provided in the wave tube so as to realize an optimum input return loss and low conversion loss for the waveguide-microstrip line.

Similarly, the other polarized wave is input from the horn antenna (21), passes through the first dielectric circuit board (26) and the short rod (28), and is arranged in the rear side of the second dielectric circuit. Input on the board (27). The input wave is the second
It is converted into a waveguide-microstrip line by an antenna pattern (not shown) for receiving the other polarized wave formed on the dielectric circuit board (27). Further, a short-circuit plate (25) is provided further behind the second dielectric circuit board (27) so as to optimally convert the input wave into the waveguide-microstrip line.

The signals of the respective polarizations input to the circuit boards (26) and (27) are amplified by a low noise amplifier (not shown) mounted on the circuit board and pass through a filter circuit (not shown). Then, it is converted into a signal of UHF or the like by a mixer circuit (not shown) and is sent out by the connector (29).

The low noise amplifier, the filter circuit, and the mixer circuit provided on the dielectric circuit board are incorporated in an input section waveguide (23) in which a casing for the waveguide and the shield is integrated and shielded. Has been done.

[0015]

As described above, according to the present invention, the casing for shielding forms a circuit accommodating space, and a dielectric circuit board for horizontal and vertical polarization is provided in the internal space, and a waveguide is provided between both boards. Since the structure is sandwiched, the shield structure is simple, the assembling work is simplified, the number of mechanical parts is reduced, and the reliability and economy can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an external perspective view of the same embodiment.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 21 Horn Antenna 22 First Housing 23 Input Waveguide 24 Second Housing 25 Shorting Plates 26, 27 Dielectric Circuit Board 28 Shorting Bar 29 Connector

Claims (1)

[Claims] 1. A microwave converter including a horn antenna for simultaneously receiving horizontal polarized waves and vertical polarized waves, comprising: a shield first casing integrally formed with a horn antenna; and a first casing. A second housing forming a space for housing the received signal conversion circuit; a first dielectric substrate installed in the circuit housing space for receiving one polarized wave;
It is sandwiched between the first and second dielectric substrates and the second dielectric substrate which is installed in the circuit housing space with a distance from the first dielectric substrate and receives another polarized wave. A microwave converter comprising: a supported input section waveguide following the horn antenna.