KR200265685Y1 - Device for Repeating Satellite Broadcasting Signal - Google Patents

Abstract

The present invention is a terrestrial relay apparatus used in a terrestrial relay system which is uplinked at a satellite broadcasting station and converts a polarization of a satellite broadcast signal downlinked from a satellite to be relayed to a subscriber receiver. 1 is collected through a reflector for receiving a 180 ° shift in phase of the frequency of the polarization group and a receive feed horn and receive feed horn for collecting electromagnetic waves of the frequency of the first polarization group reflected by the reflector and converting the phase to 180 ° and converting them into electrical signals. It consists of a low noise amplifier that reduces and amplifies the noise of the electrical signal at the same time, a wave guide for converting the electrical signal from the low noise amplifier to electromagnetic waves, and an output feed horn for converting the electromagnetic waves from the wave guide into a second polarization group for output. Receive satellite broadcasting even in shaded areas There is an effect that can provide a satellite broadcasting terrestrial relay system.

Description

Satellite broadcasting terrestrial relay device system {Device for Repeating Satellite Broadcasting Signal}

The present invention relates to satellite broadcasting. More specifically, the present invention relates to a satellite broadcasting system that can receive satellite broadcasting from a satellite directly to subscribers and receive it through a repeater and then transmit it to multiple subscribers in a specific region. It relates to a relay device.

At present, the Ku band frequency band allocated to satellite broadcasting in Korea is from 10.7GHz to 12.75GHz. Among them, the frequency band in use by Mugunghwa No. 3 satellite is 11.7GHz to 12.75GHz. The frequencies in this band are commonly used by many satellites in Korea and abroad.

As a method for improving the efficiency of using the uplink and downlink frequencies of the satellites, a method of transmitting the uplink and the downlink by using orthogonal polarization is adopted. That is, in view of the principle that orthogonal radio waves do not interfere with each other, a method of maximizing the use of frequency by transmitting only the polarized wave in the same frequency band is widely used.

For example, in case of Mugunghwa No. 3 satellite, the uplink broadcast signal is left circular circular polarization (LHCP), the downlink communication signal is vertical polarization (V-POL) and the downlink broadcast signal from satellite is left pivot It transmits by circular polarization (LHCP) and communication signal is transmitted by horizontal polarization (H-POL). In Japan, broadcast repeaters use the same frequency for both uplink and downlink, and transmit both uplink broadcast signals and downlink broadcast signals in priority circular polarization (RHCP).

1 is a view schematically showing a reception path of a subscriber satellite broadcast signal of a conventional satellite broadcast. In the drawing, reference numeral 10 is a satellite broadcasting transmitting station, 12 is a satellite transmitting antenna, 20 is a satellite, 30 and 40 is a satellite receiving antenna, 32 and 42 is a set-top box, 34 and 44 is a TV, U is an uplink broadcasting signal, D Denotes a broadcast signal of a downlink, respectively.

As shown in the figure, the broadcast signal U of the uplink transmitted from the satellite transmitting antenna 12 of the satellite broadcasting transmitting station 10 is converted into the broadcast signal D of the downlink by the satellite 20 so as to be used by the subscriber. Received by the satellite receiving antennas 30, 40.

However, there is a problem that the broadcast signal D of the download to be received from the satellite to the satellite receiving antenna 40 of the subscriber is blocked by the high-rise building 50 in the apartment dense area or the downtown area. The area in which the downlink broadcast signal D is not received is called a satellite broadcast reception shadow area.

And subscribers have to install a parabolic antenna for satellite reception in order to receive satellite broadcasts, but this requires a lot of cost and space.

On the other hand, in the case of apartments, there is a method of providing satellite broadcasting using the SMATV method equipped with a common satellite receiver, but it is necessary to replace the premises line, H / E, and distributor, and the technical problems frequently occur. There is a problem.

Accordingly, an object of the present invention is to provide a terrestrial relay device used in a satellite broadcasting terrestrial relay system capable of eliminating the above-mentioned problems.

1 is a view schematically showing a subscriber reception path of a conventional satellite broadcasting.

2 is a view schematically showing a subscriber reception path of satellite broadcasting using a terrestrial relay device according to an embodiment of the present invention.

3 is a circuit diagram of a terrestrial relay device of a satellite broadcast terrestrial relay system according to an embodiment of the present invention;

4 is a circuit diagram of a subscriber receiver of a satellite broadcasting terrestrial relay system.

5 is a view showing in detail the configuration of the reception feed horn and the low noise amplifier in the terrestrial relay apparatus according to the embodiment of the present invention shown in FIG.

6 is a view showing in detail the configuration of the transmission feed horn in the terrestrial relay device of the satellite broadcast terrestrial relay system according to an embodiment of the present invention shown in FIG.

FIG. 7 is a diagram showing an example of polarization conversion between the reception feed horn shown in FIG. 5 and the transmission feed horn shown in FIG.

8 is a cross-sectional view of a receiver of a subscriber receiver of the satellite broadcast terrestrial relay system shown in FIG.

<Description of Symbols for Main Parts of Drawings>

200: terrestrial relay device 400: subscriber receiver

510: reception frequency collector 520, 640: dielectric

530, 630: waveguide 550: low noise amplifier

540, 620, 820: probe 560: power supply connector

570, 610: SMA connector 650: output feed horn

810: reception antenna 830: intermediate frequency conversion unit

840: Connector

According to a feature of the present invention proposed to achieve the above object, a satellite for downlinking the uplink satellite broadcast signal from the satellite broadcasting transmitting station to the frequency of the first polarization group; Ground repeater; And a subscriber receiver configured to receive a frequency of the second polarization group from the terrestrial repeater, convert it into an intermediate frequency, and output the electrical signal as an electrical signal. A reflector for converting a phase of a frequency of one polarization group by 180 degrees; A reception feed horn which collects electromagnetic waves of frequencies of the first polarization group whose phases are converted from the reflectors by 180 ° and converts them into electrical signals; A low noise amplifier for reducing and amplifying the noise of the electrical signal collected through the received feed horn; A wave guide converting the electrical signal from the low noise amplifier into electromagnetic waves; And an output feed horn for converting and outputting electromagnetic waves from the wave guide into a second polarization group.

In a preferred embodiment of this aspect, the terrestrial repeater is characterized in that it comprises a plurality of the wave guide and the output feed horn.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 8.

2 is a view schematically showing a subscriber reception path of satellite broadcasting using a terrestrial relay device according to an embodiment of the present invention. In the drawings, reference numeral 110 denotes a satellite, 200 denotes a terrestrial relay device, and 400 denotes a subscriber receiver. Reference numeral 300 denotes relay propagation from the terrestrial repeater.

As shown in the figure, the terrestrial repeater 200 is installed on the roof of a building B20 where reception of a downlink broadcast signal is good. The subscriber installs the subscriber receiver 400 in each generation of the building B10 such as an apartment.

The broadcast signal relayed from the terrestrial relay device 200 to the subscriber receiver 400 is received within a broadcast reaching distance. Therefore, the ground relay device 200 is installed on the roof of the apartment in consideration of the number of subscribers in the area to be relayed, or relayed directly to the roof of the other apartment to be relayed to the apartment.

3 is a circuit diagram of a terrestrial relay device according to an embodiment of the present invention. In the figure, reference numeral 210 denotes a receiving antenna, 220 a low noise amplifier, 230 a coaxial cable, 240 a linear amplifier, and 250 an output antenna.

The receiving antenna 210 is composed of a feed horn collecting satellite broadcast signals. In addition, the output antenna 250 is composed of a feed horn for transmitting satellite broadcast signals.

In the embodiment of the present invention, the reception frequency F1 and the transmission frequency F2 through the terrestrial relay device range from 11.7 GHz to 12.75 GHz. The reception propagation type of the reception frequency F1 is a left turning circular polarization (LHCP) for broadcasting and a horizontal polarization (H-POL) for communication. In addition, the transmission propagation form of the transmission frequency F2 is a preferential circular polarization (RHCP) for broadcasting and communication.

However, the reflector installed on the front of the feed horn reflects the left circular circular polarization (LHCP) of the reception frequency F1. Since the received frequency reflected by the reflector changes in phase by 180 °, the left-circular circularly polarized wave (LHCP) for broadcasting is converted into the first-order circular polarization (RHCP) and the horizontally polarized wave (H-POL) for communication. Is collected in the feed horn of the receiving antenna 210 as it is.

As such, the reception frequency F1 collected by the reception antenna 210 is amplified by about +60 dB by the low noise amplifier 220. The amplified reception frequency F1 is transmitted to the linear amplifier 240 of the output antenna 250 through the coaxial cable 230. The coaxial cable 230 is intended to transmit a satellite broadcast signal to a place where the output antenna 250 is installed. In general, a loss of about -10 dB is generated at a short distance.

The reception frequency F1 transmitted to the linear amplifier 240 is transmitted to the transmission frequency F2 of the first circular polarization RHCP through the feed horn of the output antenna 250. In this case, the linear amplifier 240 amplifies the reception frequency F1 by, for example, +0 dB.

4 is a circuit diagram of a subscriber receiver. In the figure, reference numeral 410 denotes a subscriber receiving antenna, 420 a low noise amplifier, 430 a mixer, 440 a medium frequency amplifier, 450 a medium frequency cable, 460 a set top box, and 800 a TV.

The subscriber reception antenna 410 receives the transmission frequency F2 of the priority circular polarization (RHCP) output from the terrestrial relay device 200. The received transmission frequency F2 is amplified from the low noise amplifier 420 and then input to the mixer 430. The transmission frequency F2 is amplified by about +30 dB through the low noise amplifier 420. In the mixer 430, attenuation of about -5 dB occurs.

Meanwhile, the intermediate frequency amplifier 440 amplifies the intermediate frequency IF from the mixer 430 and transmits the intermediate frequency amplifier 440 to the set top box 460 through the coaxial cable 450. The set top box 460 outputs a signal of a channel selected by the subscriber to the TV 800 at the intermediate frequency IF transmitted as described above.

5 is a diagram illustrating in detail the configuration of a reception feed horn and a low noise amplifier in the terrestrial repeater of the satellite broadcasting terrestrial repeater system shown in FIG. In the drawings, reference numeral 510 denotes a reception frequency collector, 520 a dielectric, 530 a waveguide, 540 a probe, 550 a low noise amplifier, 560 a power supply connector, and 570 a SMA connection connector.

Here, the reception frequency collector 510 collects the reception frequency F1 from the reflector. The received frequency F1 thus collected is filtered by the dielectric 520.

The waveguide 530 guides the probe 540 to convert the filtered reception frequency F1 of the KU band into an electrical signal. The electrical signal converted by the probe 540 is amplified after the noise is removed from the low noise amplifier 550. The dielectric 520 is inserted and fixed in a diagonal direction in a plate shape so as to suit the phase of the first circular polarization (RHCP). Meanwhile, the low noise amplifier 550 is supplied with a DC power of +15 volts through the power supply connector 560.

6 is a view showing in detail the configuration of the transmission feed horn in the terrestrial relay apparatus according to the embodiment of the present invention shown in FIG. In the drawings, reference numeral 610 denotes an SMA connector, 620 a probe, 630 a waveguide, 640 a dielectric, and 650 an output feed horn.

The SMA connection connector 610 is an input port for receiving an electrical signal amplified by a low noise amplifier. The electrical signal input as described above is converted into electromagnetic waves by the probe 620 and the waveguide 630. The configuration of the probe 620 and the waveguide 630 is called a wave guide.

Electromagnetic waves introduced from the waveguide 630 are converted into preferential circular polarization (RHCP) by the dielectric 640. Accordingly, the dielectric 640 is disposed diagonally in the waveguide of the output feed horn 650 so that electromagnetic waves are converted into preferential circular polarization (RHCP). That is, the dielectric 640 generates a preferential circular polarization by being affected by one component of two orthogonal linear polarizations. The output feed horn 650 outputs the generated priority circular polarization (RHCP) to the subscriber side.

FIG. 7 is a diagram illustrating an example of polarization conversion between the reception feed horn shown in FIG. 5 and the transmission feed horn shown in FIG. 6. In the drawings, reference numeral 740a is a first pin, 740b is a second pin, 740c is a third pin, 740d is a fourth pin, 730a is a first hole, 730b is a second hole, 730c is a third hole, and 740d is a fourth pin Each hole is represented.

The feed horn shown in the drawing is a structure that can be commonly used for the reception feed horn and the transmission feed horn. Furthermore, the feed horn according to the embodiment of the present invention can be adapted to the type of polarization by adjusting the coupling angle of the waveguide.

In the drawing, when the first pin 740a is coupled with the first hole 730a and the second pin 740b is coupled with the second hole 730b, the feed horn is adapted to the preferred circular polarization (RHCP). Can be used. In addition, when the first pin 740a of the feed horn is coupled with the fourth hole 730d, and the second pin 740b is coupled with the first hole 730a, the first pin 740a may be adapted to the left turning circular polarization (LHCP). .

8 is a diagram illustrating in detail the configuration of a receiver of a subscriber receiver of the satellite broadcasting terrestrial relay system shown in FIG. In the figure, reference numeral 810 denotes a reception antenna, 820 a probe, 830 a mid-frequency converter, and 840 a connector.

The receiving antenna 810 is composed of a plane antenna to receive the radio wave of the preferred circular polarization (RHCP). The frequencies from 11.7 GHz to 12.75 GHz of the preferred circularly polarized wave received from the reception antenna 810 are transmitted to the intermediate frequency converter 830 through the probe 820. Then, the frequency of 11.7 GHz to 12.75 GHz transmitted to the intermediate frequency converter 830 is converted into an intermediate frequency (IF) of the band of 950 MHz to 2.15 GHz. The intermediate frequency IF converted into the electrical signal is transmitted to the set top box through the connector 840.

The present invention has a problem in that broadcast signals are blocked by high-rise buildings in dense areas of apartments or downtown buildings in the case of conventional satellite broadcasting reception, and parabolic antennas for satellite reception should be installed to receive satellite broadcasting. In order to install the antenna, it is necessary to replace the costly and space-consuming problem, and in case of an apartment, it is necessary to replace the premises, H / E, and distributor, and the technical problem is frequently caused. In addition, the present invention can provide a terrestrial relay device used in a satellite broadcast terrestrial relay system capable of receiving satellite broadcasts even in a satellite broadcast receiving shadow area.

Claims (5)

A satellite for downlinking the satellite broadcast signal uplinked from the satellite broadcasting transmitting station to the frequency of the first polarization group, and receiving the frequency of the terrestrial repeater and the second polarization group from the terrestrial repeater, converts the frequency into an intermediate frequency, In the terrestrial relay device that can be used in the satellite broadcasting terrestrial relay system consisting of a subscriber receiver receiving a signal, A reflector for converting a phase of a frequency of the first polarization group downlinked from the satellite by 180 degrees; A reception feed horn which reflects the reflector and collects electromagnetic waves of a frequency of the first polarization group whose phases are 180 ° and converts them into electrical signals; A low noise amplifier for reducing and amplifying the noise of the electrical signal collected through the received feed horn; A wave guide converting the electrical signal from the low noise amplifier into electromagnetic waves; And an output feed horn for converting and outputting electromagnetic waves from the wave guide into a second polarization group. The method of claim 1, And the terrestrial repeater is provided with a plurality of wave guides and output feed horns. The method according to claim 1 or 2, Wherein the first polarization group and the second polarization group are circular polarizations or linear polarizations or a combination of circular polarizations and linear polarizations. The method of claim 3, wherein And wherein the first polarization group is a combination of circular polarization and linear polarization, and the second polarization group is any one of circular polarization and linear polarization. The method of claim 4, wherein And the first polarization group is a left circular circular polarization and a horizontal polarization wave, and the second polarization group is a preferential circular circular polarization.