KR200265684Y1 - Subscriber's Receiver for Repeating System of Satellite Broadcasting - Google Patents

Abstract

The present invention provides a satellite broadcasting transmitting station for uplinking satellite broadcasting signals; A satellite for downlinking from the satellite broadcasting transmitting station; A terrestrial repeater which converts and outputs a polarized wave of downlink frequency from the satellite; And a subscriber receiver used in a satellite broadcasting terrestrial relay system, which comprises a subscriber receiver receiving a frequency from the terrestrial relay device and converting the frequency into an intermediate frequency. It includes a plane antenna for converting into an electrical signal, and an intermediate frequency converter for converting the frequency of the second polarization group received from the plane antenna into an intermediate frequency, so that satellite broadcasting can be received even in a satellite broadcasting shadowed area. By providing a subscriber receiver and installing a small reception antenna, the installation cost is reduced, and the installation space is occupied little, thereby improving the aesthetics of the building.

Description

Subscriber's Receiver for Repeating System of Satellite Broadcasting}

The present invention relates to satellite broadcasting, and more specifically, subscribers used in satellite broadcasting relay system that can receive satellite broadcasting directly from subscribers and then transmit it to multiple subscribers in a specific area without transmitting satellite broadcasting directly to subscribers. To a receiver.

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 polarized waves 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, the present invention has been proposed to solve the above-mentioned problems, and is used in a satellite broadcasting terrestrial relay system capable of eliminating satellite broadcasting shadow areas, and has a small low cost antenna for receiving satellite broadcasting signals. The purpose is to provide a subscriber receiver.

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 subscriber receiver according to an embodiment of the present invention.

3 is a circuit diagram of a terrestrial repeater of a satellite broadcast terrestrial repeater system;

4 is a circuit diagram of a subscriber receiver according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating in detail the configuration of a reception feed horn and a low noise amplifier in the terrestrial relay apparatus of the satellite broadcasting terrestrial relay system 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 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 transmitting station to the frequency of the first polarization group; A terrestrial relay device which receives a frequency of the first polarization group downlinked from the satellite, converts the frequency of the first polarization group into a frequency of the second polarization group, and outputs the frequency; A subscriber receiver for use in a satellite broadcasting relay system comprising a subscriber receiver, comprising: a planar antenna for receiving a frequency of a second polarization group of a satellite broadcast signal and converting the frequency into an electrical signal; And an intermediate frequency converter configured to convert the frequency of the second polarization group received from the planar antenna into an intermediate frequency.

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

2 is a diagram schematically illustrating a subscriber reception path of satellite broadcasting using a subscriber receiver 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 repeater of a satellite broadcast terrestrial repeater system. 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.

The reception frequency F1 and transmission frequency F2 through the terrestrial repeater 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, and a loss of about -10 dB is generally 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 of a satellite broadcasting terrestrial relay system according to an embodiment of the present invention. 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 device of the satellite broadcasting terrestrial relay system 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 drawing, 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 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 showing in detail the configuration of the receiver of the subscriber receiver of the satellite broadcasting terrestrial relay system according to the embodiment of the present invention 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 problems, and in case of the apartment, it is necessary to replace the premises, H / E, and distributor, and the technical problems are frequently caused. In addition, by providing a subscriber receiver used in a satellite broadcasting terrestrial relay system capable of receiving satellite broadcasting even in a satellite broadcasting receiving shadow area, installation cost can be reduced and installation space can be reduced by installing a small reception antenna.

Claims (3)

Receiving a satellite downlinking the uplink satellite broadcast signal from the satellite broadcasting transmitting station to the frequency of the first polarization group, receiving the frequency of the first polarization group downlinked from the satellite, and converting the frequency to the frequency of the second polarization group. A subscriber receiver that can be used in a satellite broadcasting terrestrial relay system comprising a terrestrial relay device and a subscriber receiver, A planar antenna for receiving a frequency of the second polarization group of the satellite broadcast signal and converting the frequency into an electrical signal; And a medium frequency converter for converting a frequency of the second polarization group received from the planar antenna into an intermediate frequency. The method of claim 1, And wherein the second polarization group is circular polarization or linear polarization or a combination of circular polarization and linear polarization. The method of claim 2, And the second polarization group is a preferential circular polarization.