KR100423397B1 - Dual feeding system for receiving satellite broadcasting signal - Google Patents

Abstract

The present invention is equipped with a linear polarized feed mixing unit and a circular polarization feed mixing unit in the same signal receiving direction, satellite broadcasting with a new LNB converter capable of converting each received signal into one intermediate signal to be delivered to the final receiver Provided is a feeding system of a receiver. According to the feeding system according to the present invention, linear polarization and circular polarization can be simultaneously received, and in particular, in the present invention, a feed mixing part according to each signal type can be configured to minimize the loss due to mutual interference. .

Description

Dual Feeding System for Satellite Broadcasting Equipment {DUAL FEEDING SYSTEM FOR RECEIVING SATELLITE BROADCASTING SIGNAL}

The present invention relates to a feeding system of a satellite broadcasting receiver, and more particularly, in a satellite broadcasting receiver, a feed mixing unit and a circular polization (CP) for receiving linear polarization (LP) are received. It is equipped with both feed horns for receiving both linear and circular polarization through each feed horn, by combining each of the two received signals into one, it is possible to minimize the mutual interference to increase the reception efficiency of each type The present invention relates to a satellite broadcasting receiver capable of simultaneously receiving polarization.

In general, 12 GHz satellite broadcasting signals emitted from a broadcasting satellite are received by a satellite broadcasting antenna, and the satellite broadcasting receiving antenna focuses the received satellite broadcasting signals and blocks low noise through a feeding system of the satellite broadcasting apparatus. blockdown: LNB) Transmit to converter. At this time, the received satellite broadcasting signal is classified into linear polarization and circular polarization according to the characteristics of the polarization. The linear polarization includes vertical polarization and horizontal polarization, and the circular polarization is left circular polarization (LHCP), first circular polarization (RHCP).

The feed horn portion of the feeding system is usually composed of a feed horn, a waveguide connected to the bottom thereof, and a probe for receiving a signal, and the structure of the waveguide or the shape of the probe is changed according to the polarization characteristic of the signal described above.

Conventionally, the satellite broadcasting receiver has taken a structure for receiving only one type of signal of linear polarization and circular polarization. Hereinafter, a feeding system of such a satellite broadcasting receiver will be described with reference to the drawings.

1 is a schematic diagram of a feeding system of a conventional satellite broadcasting receiver. Referring to Fig. 1 (a), a conventional feeding system for linear polarization is shown. The feeding system of the satellite broadcasting receiver comprises a feed horn (1), a waveguide (2) and an LNB converter unit (3), and the LNB converter unit formed at the bottom of the waveguide (2) is generally implemented on a printed circuit board. . In addition, a patch antenna of a conductor pattern is formed on a connection surface with the waveguide on the printed circuit board to receive linearly polarized waves. Unlike the example illustrated in FIG. 1A, the patch antenna may be implemented by forming two probes having a phase difference of 90 ° on the inner surface of the waveguide. In this case, each probe receives a signal of vertical or horizontal polarization of linear polarization.

Fig. 1 (b) shows a feeding system of a satellite broadcasting receiver for receiving circular polarization. As shown in FIG. 1 (b), a circular polarization is converted into a linear polarization using a polarizer 4 formed in a waveguide 2 connecting the feed horn 1 and the LNB converter 3, and FIG. In a manner similar to that of 1 (a), a linear polarized wave signal converted through a patch antenna formed on an LNB printed circuit board is received.

In general, the feeding system of FIG. 1 (b) receives a circular polarization by inserting a dielectric plate into the circular waveguide through the polarization separator 4 to generate a phase shift to convert the circular polarization into a linear polarization.

In addition to the above-described form, satellite broadcasting receivers having various functions and forms have been developed in the prior art, but there has been no description of a receiver for simultaneously receiving linear and circular polarized waves. In particular, in recent years, a linear satellite and a circular polarized wave are simultaneously used in a broadcast satellite. When the conventional satellite broadcast receiver described above is used, a loss of about 3 dB is generated for the other polarized wave, resulting in poor practicality. there is a problem.

Therefore, there is a need in the art for a new satellite broadcasting receiver capable of simultaneously receiving signals of linear and circular polarization with one receiver, and further minimizing mutual interference between linear and circular polarizations.

The present invention has been made to solve the above problems, the object of which is to feed each of the feed mixing unit and the signal received through each feed mixing unit in order to simultaneously receive different types of satellite broadcasting signals such as linear polarization and circular polarization The present invention provides a feeding system of a satellite broadcasting receiver including an LNB converter for transmitting an intermediate signal.

1 is a cross-sectional view of a feeding system of a conventional satellite broadcasting receiver.

2 is a cross-sectional view of a feeding system according to an embodiment of the present invention.

3 is a circuit configuration diagram of the LNB converter employed in the present invention.

<Code Description of Main Parts of Drawing>

10: feed mixing unit for receiving circular polarization

20: Feed mixing unit for linearly polarized wave reception

3,4: LNB converter 30: printed circuit board

44,54: first and second LNA 46,56: first and second filter parts

48, 58: first and second mixer section 60: local oscillator

62: combiner

According to an embodiment of the present invention, there is provided a feeding system of a satellite broadcasting receiver, comprising: a first feed mixing unit for receiving circular polarization, a second feed mixing unit for receiving linear polarization in the same receiving direction as the first feed mixing unit; Provided is a feeding system including a low-noise block-down converter for converting the signals received from the first feed mixing unit and the second feed mixing unit to a signal having a predetermined intermediate frequency, respectively, for combining and outputting the converted signal.

Further, according to one embodiment of the present invention, the first feed horn portion and the second feed horn portion include a waveguide connected to the feed horn and the feed horn, respectively, wherein the waveguide of the first feed horn phases a circularly polarized wave in a linearly polarized form. A polarization converter for moving may be provided, and a receiving antenna may be provided on the rear end of the waveguides of the first feed horn and the second feed horn to include a printed circuit board having a conductor pattern.

Furthermore, in a preferred embodiment of the present invention, the low noise block down converter includes: a first low noise amplifier for amplifying the signal received from the first feed mixing unit with a set gain; and a signal amplified by the first low noise amplifier. A first filter unit for passing only a signal of a preset frequency band, a second low noise amplifier for amplifying the signal received from the second feed mixing unit with a set gain, and a signal amplified by the second low noise amplifier. A second filter unit for passing only signals of a predetermined frequency band, a local oscillator providing an oscillation frequency, a first mixer unit for mixing an output signal of the first filter unit and the oscillation frequency, and the second filter unit As a combiner for combining the output signal and the second mixer unit for mixing the oscillation frequency and the signal output from the first and second mixer unit It can hyeonhal.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described in detail with reference to drawings.

Referring to Fig. 2, there is shown a feeding system equipped with a feed horn 10 for receiving circular polarization and a feed horn 20 for receiving linear polarization with the same receiving direction. The housing 40 of the feeding system 50 has each feed mixing portion mounted on the same surface, and a printed circuit board having an LNB converter implemented at the rear end of the waveguides 12 and 22 of the feed mixing portions 10 and 20 ( 30), a patch antenna for each receiving polarization type is implemented on the surfaces 32 and 34 corresponding to the rear ends of the waveguides 12 and 22 in the printed circuit board 30, and the other parts 36 An LNB converter circuit (not shown) is formed in a conductor pattern. In particular, the LNB converter implemented in the printed circuit board 30 is configured to process two received signals according to the polarization type.

Hereinafter, the LNB converter employed in the present invention will be described in detail.

3 is a circuit diagram of an LNB converter according to an embodiment of the present invention. Referring to FIG. 3, an LNB converter circuit 100 connected to each of the circularly polarized reception feed horn 10 and the linearly polarized reception horn 20 is configured. The LNB converter 100 employed in the present invention includes first and second low noise amplifiers 44 and 54 for amplifying signals received at the respective feed horns 10 and 20, first and second filters for amplified signals. Combining the second filter section 46 and 56, the first and second mixer sections 48 and 58 that mix the filtered signal with the oscillation frequency of the local oscillator 60, and the final signal obtained through the respective paths. Is composed of a coupler 62.

3, when a signal transmitted from satellite broadcasting has a different frequency band according to each polarization type (a circularly polarized signal is 11.01-12.01 Hz, and a linearly polarized signal is 12.25-12.75 Hz). The operation principle of the LNB converter will be described. The circularly polarized wave reception feed mixer 10 receives the circularly polarized signal among the satellite broadcast signals and transmits the circularly polarized signal to the first LNA 44. The first LNA 44 amplifies the signal, and the first filter unit 46, which is a low pass filter, filters the amplified signal and transmits the amplified signal to the first mixer 48. The first mixer 48 mixes the filtered signal with an oscillation frequency (eg, about 10.75 kHz) signal of the local oscillator 60 and converts the signal into an intermediate frequency signal. On the other hand, the signal received from the linearly polarized light receiving feed mixing unit 20 is also processed through the second LNB unit 54, the second filter unit 56 and the second mixer unit 58 in the same principle as the linearly polarized wave. However, the second filter unit 56 is somewhat different only in that it performs a band pass filter function to filter and transmit only a frequency signal of a specific band.

In this way, the signal of the other type received at each of the circularly polarized wave reception feed horn 10 and the linearly polarized wave feed horn 20 is converted into an intermediate frequency signal and converted into a single signal through the combiner 62. Transmitted to the receiver 200. Therefore, the LNB converter 100 configured as described above converts signals of respective shapes, that is, circular polarization and linear polarization, received from the two feed mixing units 10 and 20 into one intermediate signal and transmits the signal to the receiver 200. Accordingly, the linearly polarized signal and the circularly polarized signal included in the satellite broadcast signal can be simultaneously received without loss due to mutual interference.

In an embodiment of the present invention, the patch antenna was described as an example of the patch antenna on the printed circuit board in which the LNB converter is implemented, but the probe may be mounted inside the waveguide and the received signal may be configured to be connected to the LNB converter. It should be understood that the feed mixing unit for the circular polarization may be used by adopting a polarization converter, and may also be implemented as a probe for receiving the vertical and horizontal components of the circular polarization, respectively.

As described above, the present invention provides a new LNB converter which is equipped with a linearly polarized feed horn and a circularly polarized feed horn in the same signal receiving direction, and converts each received signal into one intermediate signal to be delivered to a receiver. Provided is a feeding system of a satellite broadcasting receiver. According to such a feeding system, linear and circular polarizations can be simultaneously received, and in particular, in the present invention, a feed mixing unit according to each signal type has an advantage of minimizing losses due to mutual interference.

The detailed description of the invention is provided for purposes of illustration and description. It is not intended that the invention be strictly limited as disclosed, the scope of the invention being defined by the appended claims rather than this detailed description. It is to be understood that the foregoing specification, embodiments are intended to provide a description of the components of the invention and that each component is capable of numerous modifications or variations in light of the above teaching.

Claims (3)

A feeding system for a satellite broadcasting receiver for transmitting a signal consisting of a linear polarization and a circular polarization, A first feed mixing unit for receiving circular polarization; A second feed mixing unit having the same signal receiving direction as the first feed mixing unit and for receiving a linearly polarized wave; And a low noise block down converter for converting the signals received from the first feed mixing unit and the second feed mixing unit into signals having a predetermined intermediate frequency, respectively, for combining and outputting the converted two signals. The low noise block down converter A first low noise amplifier (LNA) for amplifying the signal received from the first feed mixer by a set gain and a first filter for passing only a signal of a predetermined frequency band among the signals amplified by the first low noise amplifier And a second low noise amplifier for amplifying the signal received from the second feed mixer with a set gain, and a second filter for passing only a signal of a preset frequency band among the signals amplified by the second low noise amplifier. And a local oscillator providing an oscillation frequency, a first mixer unit mixing an output signal of the first filter unit and the oscillation frequency, and a second mixer unit mixing an output signal of the second filter unit and the oscillation frequency. And a combiner for coupling the signals output from the first and second mixers. The method of claim 1, The first feed mixing unit and the second feed mixing unit A waveguide connected to a feed horn and a feed horn respectively, the waveguide of the first feed horn having a polarization converter for phase shifting circularly polarized waves in a linearly polarized form, the rear end of the waveguide of the first feed horn and the second feed horn. Feeding system, characterized in that the printed circuit board made of a conductive pattern is connected. delete