JP2953146B2 - Downconverter for satellite radio wave reception - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a down converter for receiving satellite radio waves used for satellite broadcasting and satellite communication, and more particularly to a waterproof and unnecessary wave eliminating structure.

[0002]

2. Description of the Related Art In recent years, satellite receiving down converters have
In view of the rapid increase in the number of satellite broadcast viewers and the frequent use of satellite communication services, smaller and lighter and lower cost are required. In addition, importance has been placed on improving the ability to eliminate unwanted waves in response to the deterioration of the electromagnetic wave environment.

Hereinafter, a conventional down converter for satellite reception will be described. FIG. 2 is a cross-sectional view showing the configuration of a conventional down converter for satellite reception. In FIG. 2, reference numeral 1 denotes a metal downconverter main body, and reference numeral 2 denotes a metal waterproof case for preventing moisture from entering the downconverter main body and eliminating extraneous unnecessary waves. Reference numeral 3 denotes an intermediate frequency amplifying circuit for amplifying radio waves from the satellite converted to the intermediate frequency by the mixer circuit, 4 denotes a metal piece for supplying a signal output by the intermediate frequency amplifying circuit to the coaxial connector 5, and 6 denotes a metal piece from the satellite. This is a low-noise amplifier that amplifies the 12GHz _Z- band radio wave with low noise and supplies it to the mixer circuit.

[0004] The operation of the satellite receiving downconverter configured as described above will be described below.
Radio waves of the 12 GHz _Z band transmitted from a satellite to be received are input from a portion called a feed horn on the front face of the downconverter main body 1 and the downconverter main body 1
Is guided into the downconverter by a circular waveguide located inside. After radio waves 12GH _Z bands propagating in the waveguide is that low-noise amplified by the low noise amplifying unit 6 are converted into an intermediate frequency signal 1GH _Z-band by a mixer circuit which is located down-converter body 1 back side of FIG. 2 . afterwards,
The intermediate frequency signal is amplified to a required level by the intermediate frequency amplifier circuit 3 and is output via the coaxial connector 5 via the metal piece 4. On the other hand, the extraneous unnecessary waves in the 1 GHz _Z band are shielded by the metal waterproof case 2, the downconverter body 1, and the coaxial connector 5, so that the interference of the unnecessary waves with the output signal can be greatly reduced.

[0005]

However, in the configuration of the above-mentioned conventional example, an expensive metal waterproof case 2 must be used to eliminate extraneous unnecessary waves. Down converter body 1
In order to avoid the influence of the variation in the contact between the battery case and the waterproof case 2 at the time of assembly, it is necessary to take measures such as performing high-precision cutting on the contact surface of the two, which has caused a cost increase.

The present invention solves the above-mentioned conventional problems, and provides a satellite receiving converter that uses a low-cost waterproof case, does not require special processing, and has an extremely good ability to eliminate unwanted wave interference. The purpose is to:

[0007]

In order to achieve the above object, a down converter for satellite reception according to the present invention does not require special processing such as low-cost cutting and the like. By using a case, shielding the upper surface of the intermediate frequency amplifier circuit with a metal plate, and having a metal contact piece that makes the outer conductor of the coaxial connector and the converter main body have the same potential, extremely good unnecessary wave interference elimination capability is achieved. It is characterized by being obtained.

[0008]

According to the present invention described above, the shield cover provided on the upper surface of the intermediate frequency amplifier circuit, the down converter main body, the coaxial connector, and the metal conductor contacting the outer conductor thereof can be provided without using a metal waterproof case. The contact piece can provide a sufficient interference rejection capability against extraneous unnecessary waves.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a main part according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an aluminum die-cast down converter main body, and a radio wave from a satellite is supplied from a feed horn disposed on the front surface of the down converter main body 1 to an inner circular waveguide, and a waveguide / microstrip is provided. After the conversion, the signal is low-noise amplified by the low-noise amplifying unit 6 and converted to a 1 GHz _Z- band intermediate frequency signal by a mixer circuit on the back surface of the downconverter main body 1.
The intermediate frequency signal is amplified to a required level by the intermediate frequency amplifier circuit 3 and guided to the coaxial connector 5 via the metal piece 4. As shown in FIG. 1, the coaxial connector 5 is inserted through a through hole of a waterproof case 2 for preventing moisture from entering the downconverter 1, and its outer conductor is fixed to the downconverter body 1. The contact piece 8 is grounded. The inner conductor of the coaxial connector 5 is held by the metal piece 4 through a through hole provided in the shield cover 7 on the upper surface of the intermediate frequency amplifier circuit 3. The waterproof case 2 is made of an insulating material such as resin, rubber, ceramics, etc. in a predetermined shape by means such as injection molding.

As described above, according to this embodiment, the provision of the shield lid 7 and the contact piece 8 makes it possible to provide a low cost, light weight and dimensional accuracy without using a high cost metal case for the waterproof case. By using a waterproof case made of a high resin, it is possible to obtain an extremely good interference elimination ability against extraneous unnecessary waves.

In this embodiment, the shield lid 7 and the contact piece 8 are formed as independent parts. However, it is needless to say that the same effect can be obtained even if both are integrated.

[0013]

As described above, the present invention provides a lightweight and low-cost resin by providing a shield cover on the intermediate frequency amplifier circuit and a contact piece for making the coaxial connector and the metal downconverter main body have the same potential. By using the waterproof case, a downconverter for satellite reception having an extremely excellent ability to eliminate an interference wave against an extraneous unnecessary wave can be realized.

[Brief description of the drawings]

FIG. 1A is a side sectional view of a satellite receiving downconverter according to an embodiment of the present invention. FIG. 1B is a rear sectional view of a satellite receiving downconverter according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a configuration of a conventional down-converter for satellite reception.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Down converter main body 2 Waterproof case 3 Intermediate frequency amplification circuit 4 Metal piece 5 Coaxial connector 6 Low noise amplification part 7 Shield lid 8 Contact piece

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Takehara 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshikazu Yoshimura 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A 4-96984 (JP, U) JP-A 4-70793 (JP, U) Japanese Utility Model Application Showa 63-127184 (JP, U) Japanese Utility Model Application Showa 63-10588 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04B 1/08 H01Q 1/02 H04B 1/16

Claims (2)

(57) [Claims] 1. A waterproof case for hermetically sealing a downconverter body therein and made of an insulating member, and a metal contact piece for making an outer conductor of a coaxial connector attached to the waterproof case and the downconverter body the same potential. A down converter for receiving satellite radio waves, comprising: a metal piece for supplying signals and power to the inner conductor of the coaxial connector; and a shield lid for shielding an upper surface of the intermediate frequency amplifier circuit. 2. A down converter for receiving satellite radio waves, wherein the contact piece according to claim 1 and a shield lid are integrated.