CN214756692U

CN214756692U - anti-5G interference filter for C-band broadcast television satellite reception

Info

Publication number: CN214756692U
Application number: CN202120560222.4U
Authority: CN
Inventors: 欧德振; 欧杰煌; 陈纪强
Original assignee: Guangdong Weidao Communication Technology Co ltd
Current assignee: Guangdong Weidao Communication Technology Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2021-11-16
Anticipated expiration: 2031-03-18

Abstract

The utility model discloses a C frequency band broadcast television satellite receiving anti-5G interference filter, which comprises a C frequency band filter, a C frequency band narrow band tuner and an L frequency band filter, wherein the C frequency band filter is connected with a feed source and used for inhibiting a 5G signal received by the feed source; and the C-band filter and the L-band filter are both passive band-pass filters. Through the proposal, the utility model has the advantages of simple structure, anti-interference reliable have very high practical value and spreading value in C frequency channel broadcast television satellite reception application technical field.

Description

anti-5G interference filter for C-band broadcast television satellite reception

Technical Field

The utility model belongs to the technical field of C frequency channel radio and television satellite reception application technique and specifically relates to an anti 5G interference filter is received to C frequency channel radio and television satellite.

Background

With the formal commercial use of 5G signals, more and more cities begin to build 5G base stations in a large scale, and large operators also tighten the site settings in the central urban areas of the large cities, so that the situation that the 5G signals interfere with the reception of C-band satellite signals in the future is more and more common. Taking the Guangdong region as an example, the telecommunication 5G frequency range of the region is 3.4 GHz-3.5 GHz, and the communication 5G frequency range is 3.5 GHz-3.6 GHz; the satellite receiving antenna uses a 3.4 GHz-4.2 GHz frequency band tuner, 5G signals of an operator cause serious interference to satellite receiving signals, normal use of satellite services is influenced, mosaic phenomenon appears on television program pictures, and visible video and audio damage exists.

According to the equipment structure of the satellite receiving system, the equipment condition used at the present stage (the commonly used C-band LNB working frequency band is 3400 MHz-4200 MHz) and the frequency range (3400 MHz-3600 MHz) used by the 5G base station, when the total power of interference signals entering the satellite receiving station exceeds-60 dBm, the low noise variable frequency amplifier (LNB) generates saturated interference. The power of the frequency-converted L-band 5G signal reaching the receiver is too high. When the power of the 5G interference signal entering the LNB is close to 0dBm, the signal power output by the L frequency band can reach 0dBm, and the input level adaptive range of the satellite receiver is as follows according to the technical requirement of GY/T148-2000 satellite digital television receiver in the broadcast television industry standard: 65 dBm to 30dBm, and the excessive input level can cause the next stage satellite receiver to generate saturated interference or blocking interference.

At present, the following problems need to be solved: firstly, for broadcasting and television, broadcast television stop accidents caused by the interference problem of the 5G base station are avoided, which is the premise of the construction of the 5G base station, and the inside of the broadcasting and television 5G also faces the frequency interference and frequency clearing problems. Second, for telecommunications, it is desirable to implement compatible coexistence between 5G systems and other radio service systems, driving rapid deployment and healthy development of 5G systems.

Currently, the methods for mitigating interference from a 5G base station in the prior art mainly adopt the following methods: (1) reducing the transmitting power of the 5G base station; (2) adjusting the maximum radiation direction or the downward inclination angle of the 5G system; (3) replacing the position of the 5G base station; (4) installing a shielding net; (5) replacing the satellite antenna with good side lobe characteristics; (6) and adjusting the position of the satellite receiving point. However, the above method cannot well realize compatible coexistence between the 5G system and other radio service systems, and promotes rapid deployment and healthy development of the 5G system.

Therefore, it is urgently needed to provide an anti-5G interference filter for C-band broadcast television satellite reception, which has a simple structure and is reliable in anti-interference.

SUMMERY OF THE UTILITY MODEL

To the above problem, an object of the utility model is to provide a C frequency channel radio and television satellite receives anti 5G interference filter, the utility model discloses a technical scheme as follows:

a C frequency band broadcast television satellite receiving anti-5G interference filter is connected between a feed source and a satellite receiver and comprises a C frequency band filter, a C frequency band narrow-band tuner and an L frequency band filter, wherein the C frequency band filter is connected with the feed source and used for inhibiting a 5G signal received by the feed source; the C-band filter is a passive band-pass filter.

Preferably, the operating frequency band of the C-band filter is 3700MHz-4200 MHz.

Preferably, the operating frequency of the C-band narrow-band tuner is 3400 MHz-4200 MHz.

Preferably, the working frequency of the L-band filter is 950 MHz-1450 MHz.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) in the prior art, a feed source simultaneously receives a C-frequency band satellite signal and a telecommunication-connected 5G signal through a satellite receiving pot; the utility model filters most of the telecommunication-connected 5G signals by arranging the C frequency band filter;

(2) the utility model discloses a set up C frequency channel narrowband tuner to restrain the 5G signal of small part, and convert C frequency channel satellite signal and remaining 5G signal into intermediate frequency signal, and utilize L frequency channel filter to filter and finally obtain C frequency channel satellite signal;

to sum up, the utility model has the advantages of simple structure, anti-interference reliable have very high practical value and spreading value in C frequency channel broadcast television satellite reception application technical field.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as a limitation of the scope of protection, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a working schematic diagram of the C-band narrowband tuner of the present invention.

Fig. 3 is a working schematic diagram of the L-band filter of the present invention.

Fig. 4 is a graph of the insertion loss test curve of the C-band filter of the present invention.

Fig. 5 is a standing-wave ratio test curve diagram of the C-band filter of the present invention.

Fig. 6 is a graph of the insertion loss test of the L-band filter of the present invention.

Fig. 7 is a standing-wave ratio test curve diagram of the L-band filter of the present invention.

Detailed Description

To make the objectives, technical solutions and advantages of the present application more clear, the present invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Examples

As shown in fig. 1 to 3, the present embodiment provides a C-band broadcast television satellite reception anti-5G interference filter. The low-noise high-frequency band filter consists of a C-frequency band filter, a C-frequency band narrow-band high-frequency head and an L-frequency band filter. The working principle is as follows: the feed source simultaneously receives the C-band satellite signal and the telecom 5G signal through the satellite receiving pot, the working frequency band is wide, after passing through the C-band filter, the C-band satellite signal is normal, and the 5G signal is restrained. In practical situations, due to the filter characteristics of the filter, the out-of-band 5G signal of the C-band filter cannot be completely suppressed, and can be received and amplified by the C-band narrowband tuner together with the C-band satellite signal, the signal is converted into an intermediate frequency signal (L-band) through mixing after passing through the C-band narrowband tuner (at this time, a small portion of the 5G signal is also suppressed), the signal passes through the L-band filter again, the 5G signal intensity becomes small, the C-band satellite signal is normal, and the working requirements of the satellite receiving device are met.

The parameter characteristics of the components of the present embodiment are briefly described below:

first, the feed source is used for receiving television broadcast satellite signals and includes two types, namely single polarization and dual polarization, wherein the single polarization can only receive signals in one polarization mode (horizontal polarization or climbing vertical polarization), and the dual polarization can be simultaneously applied to the horizontal polarization and the vertical polarization

Secondly, the C-band filter is a passive band-pass filter and is composed of a filtering unit, works in a 3700MHz-4200MHz band and is used for passing satellite downlink signals and meeting the requirement of inhibiting out-of-band interference, the interface is a standard BJ40 interface, signal transmission is transparent transmission, namely, only signals working beyond 3700MHz-4200MHz are filtered, and in-band signals are not processed at all.

Thirdly, the C-band narrowband tuner amplifies weak signals transmitted by a C-band (within the frequency range of 3400 MHz-4200 MHz) satellite, then acts with a local oscillator (local oscillator frequency: 5150/5750MHz) therein, and outputs 950 MHz-2350 MHz intermediate frequency signals required by the satellite receiver, and the polarization mode comprises vertical polarization and horizontal polarization.

Fourthly, the L-band filter transmits microwave energy in the passband frequency band as maximum as possible, and simultaneously suppresses interference of out-of-band frequencies. The filter adopts a cavity design, so that low loss and small standing wave are achieved. The L-band filter is additionally arranged between the high-frequency head and the satellite receiver and can provide direct current power supply for the high-frequency head and restrain intermediate frequency signals after frequency conversion of 5G signals.

In order to verify that the embodiment has reliable characteristics, the insertion loss and standing-wave ratio test is performed, as shown in fig. 4 to 7, in this embodiment, after the satellite signal and the 5G signal are filtered by the C-band filter, the C-band narrowband tuner is frequency-converted (into the intermediate frequency L-band signal), and the L-band filter is filtered, the satellite signal strength is-35 dBm to-55 dBm, the strength meets the input requirement of the satellite receiving device (according to the technical requirement of the broadcast television industry standard GY/T148-2000 satellite digital television receiver, the input level adaptation range of the satellite receiver is-65 dBm to-30 dBm, the satellite receiver can generate saturation interference or blocking interference due to an excessively high input level), the quality of the satellite receiving signal is slightly affected, and the interference level of the L-band after the frequency conversion of the 5G signal is reduced to-70 dBm or less, the interference to satellite television signals is eliminated, satellite services are not affected, television program pictures are clear and have no mosaic phenomenon, and no visible video and audio damage exists.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and are not limitations on the protection scope of the present invention, but all the changes made by adopting the design principle of the present invention and performing non-creative work on this basis shall fall within the protection scope of the present invention.

Claims

1. A C frequency band broadcast television satellite receiving anti-5G interference filter is connected between a feed source and a satellite receiver and is characterized by comprising a C frequency band filter, a C frequency band narrow-band high-frequency head and an L frequency band filter, wherein the C frequency band filter is connected with the feed source and used for inhibiting a 5G signal received by the feed source; and the C-band filter and the L-band filter are both passive band-pass filters.

2. The filter for resisting 5G interference according to claim 1, wherein the operating frequency band of the filter for C frequency band broadcasting is 3700MHz-4200 MHz.

3. The filter of claim 1, wherein the operating frequency of the C-band narrow-band tuner is 3400 MHz-4200 MHz.

4. The filter for resisting 5G interference for C band broadcasting television satellite reception according to claim 1, wherein the operating frequency of the L band filter is 950 MHz-1450 MHz.