KR930007736Y1 - Converter - Google Patents

Abstract

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Description

Signal pickup device for low noise block converter

1 is an exploded perspective view of a low noise block converter.

2 is a perspective view of a Teflon substrate for explaining the installation position of the unnecessary signal pickup device of the present invention.

* Explanation of symbols for main parts of the drawings

10: body 12: shield plate

14: Teflon substrate 22, 24: dipole antenna

26: shield cover

The present invention relates to an electromagnetic interference (EMI) improvement device in a low noise block converter (hereinafter referred to as LNB), and particularly, to remove a phenomenon in which a local oscillation signal is mixed with an LNB input signal and affects an output signal of the LNB. An unnecessary signal pickup device in a low noise block converter.

Referring to the structure of a general LNB, as shown in FIG. 1, a Teflon substrate 4 having an LNA, a mixer unit 20, and an oscillation unit 18 provided on a body 10, and an outer portion of the substrate 14 are shown. An enclosed shield plate 12 is disposed, and the shield cover 26 is covered on the shield plate 12. However, since the input leakage of the LNB exists as an interference (Interference) at the output of the LNB, it causes EMI, so to solve this problem, the oscillator 18 and the LNA and the mixer 20 are designed on each substrate or the oscillator 18 This brings the sealing of the seals as completely as possible, all of which lead to design difficulties and operational difficulties.

On the other hand, the interference to the LNB input signal by the oscillator 18's leakage has a limitation in technically limiting the current LNB structure. In any case, since the oscillation frequency signal reaching 10 GHZ of the oscillation unit 18 cannot be completely shielded, the oscillation signal is present, and after the LNB assembly, the shield cover 26 and the shield plate 12 are present. This is because the formed space acts as a waveguide of the leakage signal.

The present invention proposes a technique that can eliminate the LNB interference by the oscillation of the oscillation signal.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 2, the present invention provides the dipole antennas 22 and 24 in the LNA and mixer section 20 of the Teflon substrate 14. These dipole antennas 22, 24 It is erected in length, and is installed through the Teflon substrate 14 in the ground pattern on the back side of the Teflon substrate (not shown). In particular, although two dipole antennas 22 and 24 are shown in the figure, it may be installed in one or three or more, and as the number of installations increases, the characteristic of the better the better.

Preferably, a shielding film that crosses the seed plate 12 is provided to eliminate waveguide formation by the shield cover 26 and the seal plate 12, but it is impossible to realize the current LNB circuit design. . In addition, since the shield pattern 16 in the LNA and the mixer section 20 exists in the existing LNB, the respective dipole antennas 22 and 24 are provided on the left and right sides of the pattern 16. This alone can pick up and ground a sufficient oscillation section.

Specifically, the operation and effects of the present invention will be described. First, since the oscillation portion 18 on the Teflon substrate 14 is shielded from the LNA and the mixer portion 20 by the transverse shield bar integrated with the shield plate 12, the primary ridge of 10 GHz is solved.

Next, the secondary waveguide of 20 GHz flows through the waveguide in the LNA and mixer unit 20 formed by the shield cover 26 and the shield plate 12. It is picked up by the dipole antennas 22 and 24 of the length and flows to the ground on the back side of the Teflon substrate 14, thereby completely absorbing the secondary liquid without regeneration and deterioration.

Therefore, it is possible to remove the influence of the interference wave mixed in the input signal of the LNB through a simple dipole installation, it is possible to significantly improve the input leakage characteristics of the LNB.

Claims (1)

In the LNB including the body 10, the Teflon substrate 14, the shield plate 12 and the shield cover, the LNA and the mixer section 20 of the Teflon substrate 14 are The dipole antenna (22, 24) of the length is provided, the dipole antenna (22, 24) is unnecessary signal pickup device in the low-noise block converter, characterized in that installed in the ground point on the back of the Teflon substrate (14).