KR0131979B1 - Receiving converter for use in satellite antenna - Google Patents

Abstract

The present invention discloses a receiver converter for a satellite antenna. The disclosed receiver converts a circular waveguide having a reflection surface for reflecting a signal received at a rear end of the feed horn, and a vertical polarization component of the received linearly polarized wave in front of the inside of the circular waveguide to the main circuit of the LNB. A first resonant probe to be transmitted, a polarization diverter installed at the rear of the circular waveguide and rotating a horizontal polarization component among the received linear polarizations by 90 degrees, and a polarization diverter installed in front of the polarization diverter; A second resonant probe rotating horizontally and reflected by the reflecting surface to a main circuit of the LNB; The LNB is characterized in that a switching unit for selectively connecting the first and second resonant probes with the main circuit of the LNB is provided. Therefore, the structure is simple, so that the cost can be reduced, and the durability is excellent and the life is improved.

Description

Receiver Converter for Satellite Antenna

1 to 3 are schematic diagrams showing conventional receiver converters for satellite antennas.

4 is a perspective view showing a receiving converter for a satellite antenna according to the present invention.

5 is a perspective view showing an excerpt of the circular waveguide shown in FIG.

6 is a circuit diagram of a receiver for a satellite antenna according to the present invention.

* Explanation of symbols for main parts of the drawings

30: feed horn 31: circular waveguide

32: reflective surface 33: first resonant probe

34: polarization diverter 35: second resonant probe

36: signal separation rod

40: LNB (Low Noise Blockdown Converter)

41: main circuit 50: switching unit

51,52: First and second switch

The present invention relates to a receiver for a satellite antenna, and more particularly to a receiver for a satellite antenna capable of receiving a linear polarization, that is, horizontal and vertical polarization at the same time.

In general, satellite antennas focus radio waves emitted from geostationary satellites and transmit the information to the receiver or, in the case of broadcasting, a television receiver through a cable. There is provided a receiving converter which converts the signal to a frequency band usable by an information receiving apparatus or a television receiver and transmits it.

The above-described receiving converter is composed of a low noise blockdown converter (hereinafter abbreviated as LNB) including a waveguide (Feedhorn) for receiving satellite signals and a main circuit unit for reducing the received frequency. have.

In general, radio waves emitted from geostationary satellites have different frequency bands and polarization characteristics in different countries or regions so as not to interfere with each other. Polarization characteristics are classified into linear and circular polarizations. Linear polarizations include vertical and horizontal polarizations, and circular polarizations include left and right circular polarizations and preferential circular polarizations.

1 shows an example of a conventional receiver converter for receiving linearly polarized waves, ie, vertical and horizontal polarized waves, between the circular waveguide 1 for receiving satellite signals and the two LNBs 2,3. Ortho-mode-transducer (hereinafter, abbreviated as OMT) 4.

The conventional receiver converter configured as described above receives vertical and horizontal polarized waves by separating the signals received from the circular waveguide 1 into vertical and horizontal components and then transmitting them to two LNBs 2 and 3 with different output terminals. . However, this method has a disadvantage in that the price of the product is increased by using two expensive LNBs, and the effective receiving area is reduced by the space occupied by the OMT 4 and the two LNBs 2 3.

2 is another example of the related art, in which a plunger 14 is rotatably installed by a servo motor 13 between a circular waveguide 11 and an LNB 12, and a plunger 14 is provided with a rotary probe. 15) is installed and configured. Therefore, by changing the direction of the resonant probe 15 installed in the plunger 14 by the mechanical rotation of the servo motor 13, it is possible to select the vertical and horizontal polarization from the signal received by the circular waveguide (11). However, this method also increases the price of the product due to the addition of a mechanical device, has the disadvantage of high failure rate and short life.

3 illustrates another example of the related art, in which the magnetic plunger 22 is installed in the circular waveguide 21. This allows the radio waves to be rotated by the magnetic field generated by adjusting the magnitude of the current flowing in the coil 24 wound on the ferrite core 23, thereby selectively selecting the vertical or horizontal polarization by coupling to the resonant probe. However, the rotation angle of the radio wave is determined according to the amount of current flowing through the coil wound on the waste light core, but it is difficult to adjust according to the frequency of the received signal, which makes it difficult to adjust accordingly and the price of the product is expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has an object of providing a receiver for a satellite antenna having a simple structure and a low cost and excellent durability and improved lifespan.

In order to achieve the above object, the present invention provides a satellite having a feed horn for receiving a signal emitted from the satellite, and an LNB incorporating a main circuit for bringing down the signal received by the feed horn into an available frequency band. In the receiving receiver for an antenna, the feed horn is provided with a circular waveguide having a reflecting surface reflecting a received signal at a rear end thereof, and a vertical polarization component of the received linearly polarized wave in front of the inside of the circular waveguide. A first resonant probe transmitted to the main circuit, a polarization diverter installed at the rear of the circular waveguide and rotating a horizontal polarization component among the received linear polarizations by 90 degrees, and a polarization diverter installed in front of the polarization diverter A second resonant probe which is rotated 90 degrees by and transmits the horizontal polarization reflected by the reflecting surface to the main circuit of the LNB; The LNB is characterized in that a switching unit for selectively connecting the first and second resonant probes with the main circuit of the LNB is provided. In addition, a preferred feature of the present invention is that between the first and second resonant probes and the second resonant probe, the residual vertical polarization passing through the first resonant probe and not being coupled to the second resonant probe is not coupled to the second resonant probe. The signal separating rods reflecting the horizontally polarized light passing through the first and second resonant probes are provided.

Therefore, the present invention has the advantages of simple structure, low cost, and long life compared with the conventional receiver converter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The receiving converter for a satellite antenna according to the present invention has a feed horn 30 for receiving a signal emitted from a satellite and a signal received by the feed horn 30, as shown in FIGS. 4 and 5. The LNB 40 has a built-in main circuit for bringing down to an available frequency band.

In addition, according to the characteristics of the present invention, the feed horn 30 has a reflecting surface 32 reflecting the received signal at the rear end of the circular waveguide 31, and received linearly polarized wave in front of the inside of the circular waveguide 31. The first resonant probe 33 for transmitting the vertically polarized wave component to the main circuit 41 of the LNB 40 is provided.

A polarization diverter 34 for rotating a horizontal polarization component of the received linearly polarized wave 90 degrees is installed at an angle of about 45 degrees to the rear of the circular waveguide 31, and a polarization diverter 34 is provided in front of the polarization diverter 34. The first resonant probe 35 is rotated by 90 degrees and transmits the horizontal polarization reflected by the reflecting surface 32 of the circular waveguide 31 to the main circuit 41 of the LNB 40.

The first resonant probe 33, the second resonant probe 35, and the main circuit 41 of the LNB 40 are selectively connected by the switching unit 50, and the first resonant probe 33 and the second resonator probe 33 are connected to each other. Between the resonant probes 35, the remaining vertical polarized wave passing through the first resonant probe 33 without being coupled to the first resonating probe 33 and the horizontal polarization passing through the first resonant probe 35 without being coupled to the first resonant probe 35 are respectively formed. The signal separation rod 36 reflecting to the 33 and 35 is provided.

As shown in FIG. 6, the LNB 40 includes a low noise amplifier 42, a bandpass filter 43 for removing noise at a received frequency, and a frequency passed through the bandpass filter 43. A mixer 45 for synthesizing the sound waves from the oscillator 44, an intermediate frequency amplifier 46 for amplifying the frequency down through the mixer 45, and a band-blocking filter 47 for removing noise, The first and second switches 51 and 52 as the switching unit 50 are provided between the first and second resonant probes 33 and 35 and the low noise amplifier 42 provided in the circular waveguide 31.

The receiver converter for satellite antenna according to the present invention configured as described above receives vertical polarization and horizontal polarization in linear polarization as follows.

The linearly polarized wave received by the first and second resonant probes 33 and 35 provided in the circular waveguide 31 is transmitted to the main circuit 41 of the LNB 40 through the switching unit 50. At this time, the first and second resonant probes 33 and 35 are selectively connected and shorted with the main circuit 41 of the LNB 40 according to the on and off states of the switching unit 50. One polarization of the linear polarization is selected.

First, when the modified polarization and the horizontal flat wave in the linear polarization are simultaneously received, the first resonance probe 33 is turned on by turning on both the first and second switches 51 and 52 of the switching unit 50. ) And the second resonant probe 35 are connected to the main circuit 41 of the LNB 40.

Accordingly, as shown in FIG. 5, the first resonant probe 33 of the vertical polarization V and the horizontal polarization H in the linear polarization wave 31 passes through the circular waveguide 31 according to the characteristics of the resonant probe taking only the same direction component. A vertical polarization V having the same direction as) is combined with the first resonant probe 33 and transmitted to the main circuit 41 of the LNB 40.

In addition, some residual vertical polarization V passing through the first resonant probe 33 without being coupled to the first resonant probe 33 is installed in the same direction behind the first resonant probe 33. Reflected by the second resonator probe 33 is recombined with the first resonant probe 33 and transferred to the main circuit 41 of the LNB 40.

Accordingly, the vertical polarization V in the linear polarization is exhausted while passing through the first resonance probe 33 and the signal separation rod 36, and the first resonance probe 33, the signal separation rod 36, and the second resonance probe are exhausted. Only the horizontal polarization H different in direction from (3) passes through them, and reaches the polarization diverter 34.

The horizontally polarized wave H reached by the propagation direction switch 34 is a polarized wave made of a dielectric plate having an angle of 45 degrees with the first resonance probe 33, the signal separation rod 36, and the second resonance probe 3. As shown in FIG. 5, the turner 34 is rotated 90 degrees so as to be converted in the same direction as the vertical polarization.

The horizontal polarization H converted in the same direction as the vertical polarization is reflected by the reflecting surface 32 and combined with the second resonant probe 35 to be transmitted to the main circuit 41 of the LNB 40. Some residual vertically polarized horizontal polarization that passes through without being coupled with the resonance probe 35 is reflected by the signal separation rod 36 to the second resonance probe 35 to be recombined with the second resonance probe 35. .

When only the vertical polarization V in the linear polarization is to be received, only the first switch 51 connecting the first resonant probe 33 and the main circuit 41 of the LNB 40 is turned on. The second switch 52 may be turned off. On the contrary, when only the horizontal polarization H is to be received, only the second switch 52 is turned on and the first switch 51 is turned off. do.

As described above, according to the receiver converter for satellite antenna of the present invention, the vertical polarization in the linear polarization is combined with the first resonant probe, and the horizontal polarization is rotated 90 degrees by the polarization diverter and the reflecting surface in the same direction as the vertical polarization. Reflected in the switched state is coupled to the second resonant probe, and the vertical and hand polarization combined with the first and second resonant probes are selectively transmitted to the circuit of the LNB by the switching unit, so that the vertical and horizontal polarization As there is no need for a mechanical or electrical device that has been added to receive, the structure is simple and thus the cost can be reduced, the durability is excellent, and the life is improved.

Claims (2)

A receiver for a satellite antenna having a feed horn for receiving a signal emitted from a satellite, and an LNB having a main circuit for lowering the signal received by the feed horn to an available frequency band, wherein the feed horn is A circular waveguide having a reflecting surface reflecting the received signal at a rear end thereof, a first resonance probe installed in the front of the inside of the circular waveguide, and transmitting a vertical polarization component of the received linear polarization to the main circuit of the LNB; A polarization diverter installed at the rear of the circular waveguide and rotating a horizontal polarization component among the received linear polarizations by 90 degrees; A second resonant probe for transmitting the horizontal polarized wave to the main circuit of the LNB; And a switching unit configured to selectively connect the first and second resonant probes with a main circuit of the LNB in the LNB. The method of claim 1, wherein the residual vertical polarization that passes through the first resonance probe and the second resonance probe without coupling to the first resonance probe and the horizontal polarization passing without coupling to the second resonance probe, respectively. A receiver for satellite antenna, characterized in that the signal separation rod is installed to reflect the first, second resonant probe.