WO2002035649A1

WO2002035649A1 - Lnb holder for satellite antenna

Info

Publication number: WO2002035649A1
Application number: PCT/KR2001/001829
Authority: WO
Inventors: Tae-In Kwon
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-10-28
Filing date: 2001-10-29
Publication date: 2002-05-02
Anticipated expiration: 2003-04-28
Also published as: KR20030063367A; KR20030040561A

Abstract

An LNB holder (H) for a satellite antenna includes an arm end cap (30) capped on one end portion of an LNB arm (14) of the satellite antenna and having an uneven surface uniformly formed on outer surfaces of the opposite sides along the lengthwise direction of the LNB arm, a holder base (20) in which the width of an inner side surface is formed greater than the width of an outer side surface of the arm end cap, a cap insertion portion (22) into which the arm end cap is inserted is formed open at one side thereof, an uneven surface contacting each of the uneven surfaces of the arm end cap is formed on each inner side surface of the opposite sides of the cap insertion portion, and a guide rail portion (21) having a horizontal movement guide groove (21a) for guiding a horizontal sliding of a horizontal movement guide (43) is formed at the outer side of a closed end portion thereof; and a pair of upper and lower ring covers (42) encompassing with pressure around a connection portion between a feed horn (16) and an LNB (15) and _having a symmetrical shape as the upper and lower ring covers are assembled by coupling screws, and having the horizontal movement guide inserted into the horizontal movement guide groove and capable of sliding in the horizontal direction is integrally formed with a lower end portion of the lower ring cover. Thus, when the position of a feed horn is deviated after installation, only by a simply manipulation of inserting and moving the position of the holder base vertically and sliding the ring covers horizontally, after unscrewing the coupling screw, the changed position of the feed horn can be conveniently and finely adjusted so that a focus error can be corrected and radio waves can always be received in an optimal state.

Description

LNB HOLDER FOR SATELLITE ANTENNA

Technical Field

The present invention relates to an LNB holder for a satellite antenna, and more particularly, to an LNB holder for a satellite antenna which can always receive waves in an optimal state by simply correcting deviation in a focus of a feed horn with a means provided at the LNB itself for performing fine adjustment up and down, and left and right, in an antenna type in which the position of a satellite antenna by calculating a relative position between a particular static satellite and a reference object such as the celestial body or a particular geographical object '

Background Art

With the recent appearance of digital satellite broadcasting, satellite broadcasting becomes popular and a need for a satellite antenna gradually increases. There are various types of antennas to receive satellite broadcasting signals, that is, a dipole antenna, a horn antenna, a reflector antenna, or a phase-array antenna. Actually, the antennas have different objects for which the antennas are used and different purposes. • Among the above antennas, the most widely used is a reflection plate antenna (a so-called dish antenna) which has a simple structure, light and easy to install. The reflection plate antenna, as shown in FIGS. 3 and 4, is provided with a reflection plate support 13 including a pole 13a extending perpendicularly from a base plate 13b, and an antenna assembly such as a reflection plate 10 is installed on top of the pole 13 a. The antenna assembly includes a dish-shaped reflection plate 10 for reflecting wave signals, a feed horn 16, and a low noise block-down converter 15 (hereinafter called the "LNB") for amplifying low noise and lowering a frequency received by the feed horn 16. The feed horn 16 and the LNB 15 are installed at a predetermined position with respect to the reflection plate 10. The feed horn 16 and the LNB 15 form a reflection signal pickup unit. An LNB arm 14 is used to locate the reflection signal pickup unit at a predetermined position. An LNB holder H is installed at one end of the LNB arm 14 so that the LNB 15 and the feed horn 16 are fixed by the LNB holder H.

The signal from the LNB 15 is input to a receiving portion (not shown) of a monitor through a cable. The reflection plate 10 of the antenna forms a reflection surface 10a that is a flat surface or curved surface, mainly paraboloid(parabolic surface) and is designed to have various sizes according to a signal to receive.

The feed horn 16 and the LNB 15 are typically fixed in front of the reflection plate 10 and are arranged separated by a focal length of the reflection surface from the reflection plate. Also, the antenna is classified into a parabolic antenna, a Cassegrain antenna, Gregorian antenna, and a horn reflector antenna according to the method of focusing the signals reflected by the reflection plate and the shape of the reflection plate.

It is obvious that these various types of satellite antenna must exert all of high gain, high efficiency, and high directional performances. That is, since a signal transmitted by a satellite revolving together with the earth high above the earth exhibits very high directivity, the direction of an antenna need to accurately face toward the satellite. Since a degree of the directivity of the satellite is set within a range of 2-3°, when the direction of the satellite antenna is out of this range, the signal being received is completely cut off unlike general airborne broadcasting. In particular, the directivity becomes severe with digital satellite broadcasting. Thus, since the satellite antenna should maintain high directivity, considerable efforts are needed to install the satellite antenna in an accurate direction.

In a conventional method of installing a satellite antenna which is a manual method, while a person adjusts the direction of the antenna plate, another person watches a monitor indoor so that the direction of the reflection plate is continuously adjusted until the monitor displays. Alternatively, the direction of the satellite antenna is adjusted using an angle meter (12) or a compass so that the antenna roughly directs the satellite, based on the positional information (an azimuth angle and angle of elevation (altitude)) of the satellite. Then, with an electric field strength measuring apparatus being connected, the direction of the antenna is continuously changed until a satellite signal is captured. If a signal is captured, although it is weak, the captured signal level is monitored and then a fine adjustment method is used.

As described above, the installation of the satellite antenna is a job requiring complicated technique. Thus, a technician is needed which becomes a factor of increasing a cost. Further, although the satellite antenna is accurately installed, when the direction of the antenna is deviated due to a careless use or external environment, the direction of the antenna needs to be reset.

To solve the above problem, there is a method of installing a satellite antenna in a simply way using the position of the sun or other celestial body. However, in this method, when parts such as the LNB arm 14 of the satellite antenna is deformed during a distribution, assembly, or installation step, the adjustment position (focus point) is changed. That is, since the feed horn 16 which focuses radio waves is not in a normal position with respect to the reflection plate 10, even though the reflection plate 10 is accurately set toward a static satellite, a defect of receiving may occur.

Accordingly, for the case in which a focus error is generated to the feed horn, a method of correcting the error in a clear and simple way is needed. In the case of fitting the angle of the reflection plate 10 by a relative position calculating method between the celestial body and a static satellite using the celestial body, to correct a deviation of focus point of the antenna itself, an additional satellite signal measuring meter is needed for fine adjustment.

Disclosure of the Invention

To solve the above problems, it is an objective of the present invention to provide an LNB holder for a satellite antenna which can always receive waves in an optimal state by simply correcting deviation in a focus of a feed horn with a means provided at the LNB itself for performing fine adjustment up and down, and left and right, in an antenna type in which the position of a satellite antenna by calculating a relative position between a particular static satellite and a reference object such as the celestial body or a particular geographical object

To achieve the above objective, there is provided an LNB holder for a satellite antenna comprising an arm end cap capped on one end portion of an LNB arm of the satellite antenna and having an uneven surface uniformly formed on outer surfaces of the opposite sides along the lengthwise direction of the LNB arm, a holder base in which the width of an inner side surface is formed greater than the width of an outer side surface of the arm end cap, a cap insertion portion into which the arm end cap is inserted is formed open at one side thereof, an uneven surface contacting each of the uneven surfaces of the arm end cap is formed on each inner side surface of the opposite sides of the cap insertion portion, and a guide rail portion having a horizontal movement guide groove guiding a horizontal sliding of a horizontal movement guide is formed at the outer side of a closed end portion thereof, and a pair of upper and lower ring covers encompassing with pressure around a connection portion between a feed horn and an LNB and having a symmetrical shape as the upper and lower ring covers are assembled by coupling screws, and having the horizontal movement guide inserted into the horizontal movement guide groove and capable of sliding in the horizontal direction is integrally formed with a lower end portion of the lower ring cover.

It is preferred in the present invention that a slot is formed in each of the opposite side surfaces of the holder base in a widthwise direction, a screw hole is formed in each of the opposite side surfaces of the arm end cap, the arm end cap is inserted into the holder base and disposed at a predetermined position thereof and the height of the feed horn is adjusted, and the position of the arm end cap in the holder base is fixed by coupling the arm end cap and the holder base using coupling screws through the slot and the screw hole.

It is preferred in the present invention that notch marks are formed at each of the holder base and the arm end cap to recognize the vertical positions of the holder base and the arm end cap which are coupled via the uneven surfaces.

It is preferred in the present invention that a hook portion is formed around an open end of the arm end cap so that, when the holder base is inserted around the arm end cap, the holder base is prevented from being further inserted.

It is preferred in the present invention that a screw hole penetrating the horizontal movement guide groove is formed in the guide rail portion of the holder base, a slot is formed in the horizontal movement guide of the lower ring cover in the horizontal direction, and the horizontal movement guide is inserted disposed at a predetermined position of the guide rail portion so that the horizontal position of the feed horn is adjusted, and the position of the horizontal movement guide is fixed by using the coupling screw through the screw hole and the slot. It is preferred in the present invention that notch marks are formed at each of the horizontal movement guide of the lower ring cover and the guide rail portion of the holder base to recognize the horizontal position of the horizontal movement guide inserted in the horizontal movement guide groove. It is preferred in the present invention that a reference member for identifying the position of the ring cover protrudes upward at the center of the upper portion of the upper ring cover.

It is preferred in the present invention that an apex is formed at the center of the reference member and a hook and a hook hole for hooking a wire are formed at one side thereof.

It is preferred in the present invention that an auxiliary fixing ring for pressing and fixing a connection portion connecting the feed horn and the LNB and having a relatively small diameter is provided inside the ring covers. It is preferred in the present invention that, in the auxiliary fixing ring, a severed portion enabling one side thereof extended according to the diameter of the connection portion connecting the feed horn and the LNB, is formed, and a groove is formed in the inner surface opposite to the severed portion to facilitate the extension of the auxiliary fixing ring, and a plurality of protrusions are formed in the cylindrical direction to firmly fixed the LNB connection portion are formed on the inner circumferential surface of the auxiliary fixing ring at an identical interval.

It is preferred in the present invention that an escape prevention protrusion is formed on and along the outer circumferential surface of the auxiliary fixing ring and a plurality of accommodation grooves are formed in and along the inner circumferential surface of each of the ring covers so that the escape prevention protrusion is accommodated in the accommodation grooves and fixed therein.

To achieve the above objective, there is provided an LNB holder for a satellite antenna comprising an arm end cap capped on one end portion of an

LNB arm of the satellite antenna, a holder base in which the width of an inner side surface is formed greater than the width of an outer side surface of the arm end cap, a cap insertion portion into which the arm end cap is inserted is formed open at one side thereof, and a guide rail portion having a horizontal movement guide groove guiding a horizontal sliding of a horizontal movement guide is formed at the outer side of a closed end portion thereof, and a pair of upper and lower ring covers encompassing with pressure around a connection portion between a feed horn and an LNB and having a symmetrical shape as the upper and lower ring covers are assembled by coupling screws, and having the horizontal movement guide inserted into the horizontal movement guide groove and capable of sliding in the horizontal direction is integrally formed with a lower end portion of the lower ring cover.

Brief Description of the Drawings

FIG. 1 is a perspective view showing the state in which an LNB holder for a satellite antenna according to a preferred embodiment of the present invention is assembled; FIG. 2 is an exploded perspective view of the LNB holder of FIG. 1;

FIG. 3 is a side view showing an example of a satellite antenna adopting the LNB holder of the present invention, in which the process of adjustment of the position of the feed horn by the fine manipulation of the LNB holder; FIG. 4 is a front side view of the satellite antenna of FIG. 3; ^* FIG. 5 is a perspective view showing an example of a satellite antenna having a wire capable of adjusting an azimuth angle installed at the LNB holder according to the present invention; and

FIGS. 6 A and 6B are vertical sectional views showing the process of finely adjusting the position of the feed horn up and down in which an arm end portion cap is inserted into a holder base according to the present invention.

Best mode for carrying out the Invention

As shown in FIGS. 3 and 4, a satellite antenna adopting an LNB holder H according to the present invention includes a reflection plate 10 having a concave reflection surface 10a. A bracket 11 is installed at the rear surface of the reflection plate 10 and the bracket 11 is hinge coupled to a pole 13a of a reflection plate support 13. The reflection plate 10 can rotate around a shaft pin (not shown) of a hinge portion (not shown). Preferably, an angle meter 12 indicating notch marks 12a is provided at the bracket 11 to identify an angle (altitude).

Also, an LNB arm 14 is coupled to one side of the reflection plate 10. An LNB 15 and a feed horn 16 are fixed at a tip end portion of the LNB arm 14 via an LNB holder H of the present invention.

The LNB holder H according to a preferred embodiment of the present invention, as shown in FIGS. 1 and 2, includes an arm end cap 30 coupled to the tip end portion of the LNB arm 14, a holder base 20 inserted around the arm end cap 30 and fixed to be capable of adjusting a position vertically, and an LNB fixing portion 40 coupled to one end portion of the holder base 20 and fixed to be capable of adjusting a position horizontally.

The arm end cap 30 is capped on one end portion of the LNB arm 14. An uneven surface 33 is uniformly formed in the outer surfaces of the opposite sides of the LNB arm 14 along the lengthwise direction thereof. An arm insertion portion 31, into which the tip end portion of the LNB arm 14 is inserted, is formed inside the arm end cap 30. A hook portion 32 is formed around an open end of the arm end cap 30 so that, when the holder base 20 is inserted around the arm end cap 30, the holder base 20 is prevented from being further inserted. A screw hole 34 through which a coupling screw 24a inserted is formed in the uneven surface 33.

The inner width of the holder base 20 is greater than the outer width of the side surface of the arm end cap 30. A cap insertion portion 22 into which the arm end cap 30 is inserted is formed to have an open end at one side of the holder base 20. An uneven surface 22a corresponding to the uneven surface 33 of the arm end portion 30 is formed at each inner surface of the opposite sides of the cap insertion portion 22. A guide rail portion 21 having a horizontal movement guiding groove 21a along which a horizontal movement guide 43 to be described later can slide to the left and right is formed at the outer surface of an closed end of the holder base 20.

A slot 24 is formed in the widthwise direction at the opposite sides of the holder base 20, corresponding to the position of the screw hole 34 of the both side surfaces of the arm end cap 30. The arm end cap 30 is inserted into the holder base 20 and disposed at a predetermined position therein. Then, after the height of the feed horn 16 is adjusted, the holder base 20 and the arm end cap 30 are fixedly coupled by the coupling screw 24a inserted through the slot 24 and the screw hole 34. Notch marks 25 are formed at each of the holder base 20 and the arm end cap 30 which are coupled via the uneven surfaces 22a and 23 contacting each other, to recognize the height thereof.

The LNB fixing portion 40 includes a pair of upper and lower ring covers 42 having a symmetrical half-circle shape. The upper and lower ring covers 42 are assembled using coupling screws 42c by encompassing, with pressure, the outer circumference of a connection portion between the feed horn 16 and the LNB 15. The horizontal movement guide 43, which is inserted in the horizontal movement guide groove 21a and capable of sliding to the left and right, is integrally formed with a lower end portion of the lower ring cover 42.

Also, a screw hole 23 penetrating the horizontal movement guide groove 21a is formed in the guide rail portion 21 of the holder base 20. A slot 43 a is formed in the horizontal movement guide 43 of the lower ring cover 42. The horizontal movement guide 43 is inserted into the guide rail portion 21 and disposed at a predetermined position therein. Then, after the position of the feed horn 16 in the horizontal direction is adjusted, the horizontal movement guide 43 and the guide rail portion 21 are fixedly coupled by inserting the coupling screw 23a through the screw hole 23 and the slot 43a.

Notch marks 43b are formed at each of the horizontal movement guide

43 of the lower ring cover 42 and the guide rail portion 21 of the holder base 20 to recognize the horizontal position when the horizontal movement guide 43 is inserted along the horizontal movement guide groove 21a. A reference member

44 is protruding upward at the central upper portion of the upper ring cover 42 so that the position of the ring covers 42 with respect to the reflection plate 10 can be recognized. Here, an apex portion 44a is formed at the center of the reference member 44. A hook 44b and a hooking hole 44c are formed at one side of the reference member 44 so that a wire 50 (refer to FIG. 5) can be connected between the reflection plate 10 and the LNB holder H. In particular, the hooking hole 44c is provided to hook the wire 50 which is elastic such as a rubber cord.

The assembly of the ring covers 42 are described in detail. A flange 42a is formed at both ends of each of the ring covers 42 so that the flanges are closely coupled to face each other. A screw hole 42b is formed at the flange 42a so that, when the flange 42a and the screw hole 42b are matched, the upper and lower ring covers 42 are coupled using the coupling screws 42c.

In another preferred embodiment of the present invention, a cylindrical auxiliary fixing ring 41 is further provided inside the ring covers 42 of the feed horn fixing portion 40 to fix with pressure a connection portion connecting the feed horn 16 and the LNB 15 having a diameter less than that of the ring covers 42.

The auxiliary fixing ring 41 has a severed portion 41b so that one side thereof can be extended according to a degree of the diameter of a portion connecting the feed horn 16 and the LNB 15. A groove 41a is formed in the inner surface opposite to the severed portion 41b to facilitate the extension of the auxiliary fixing ring 41. A plurality of protruding portions 41c are formed at identical interval along the inner circumference of the auxiliary fixing ring 41 in a cylindrical direction so that the connection portion of the LNB 15 can be firmly fixed.

Also, an escape prevention protrusions 41d are formed on and along the outer circumferential surface of the auxiliary fixing ring 41. A plurality of accommodation grooves 42d are formed in and along the inner circumferential surface of each of the ring covers 42 so that the escape prevention protrusion 4 Id can be inserted in the accommodation grooves 42d and firmly held thereby.

In the above description, the height adjustment portion formed between the holder base 20 and the arm end cap 30, and the horizontal position adjustment portion formed between the holder base 20 and the ring covers 42, can be modified into various forms, and it is actually difficult to describe every detail of the modified cases. Thus, these various modifications should be considered as equivalences to the structure according to the present invention.

For example, the following structure may replace the structure of the uneven surfaces 22a and 33 regarding the height adjustment portion formed between the holder base 20 and the arm end cap 30. That is, an LNB holder for a satellite antenna according to a modified preferred embodiment includes an arm end cap capped on one end portion of the LNB arm 14, and a holder base having a width of the inner side surface greater than the width of the outer side surface of the arm end cap 30, in which the cap insertion portion 22 through which the arm end cap 30 can be inserted is formed open, so that the holder base 20 and the arm end portion 30 are fixedly coupled each other when the cap insertion portion 22 is disposed at a desired position in the holder base 20.

In the above structure according to this preferred embodiment, the surfaces contacting each other are formed flat, not uneven, and the arm end cap 30 is moved up and down inside the holder base 20 and fixed at the position by using the coupling screw 24a. Thus, when the position of the arm end cap 30 is to be changed, there is no need to completely separate the arm end cap 30 from the holder base 20 through the cap insertion portion 22, unlike the case in which the uneven surfaces 22a and 33 are formed. That is, after simply unscrewing the coupling screw 24a and moving the arm end cap 30, the arm end cap 30 and the holder base 20 are coupled again.

In addition, to more stably realize the sliding movement of the arm end cap 30 in the horizontal and vertical directions, a guide rail can be formed between the contact surfaces of the holder base 20 and the arm end cap 30 in the widthwise direction.

Also, in another preferred embodiment of the horizontal adjustment portion formed between the holder base 20 and the ring covers 42, contrary to the description of the first preferred embodiment, a horizontal movement guide can be formed at the closed end portion of the holder base 20 and the guide rail portion can be formed at the lower end portion of the lower ring cover 42.

As described above, the LNB holder H according to the present invention enables a find adjustment of the position of the feed horn through the vertical movement between the holder base 20 and the arm end cap 30 and the horizontal movement between the holder base 20 and the ring covers 42. In particular, the process of the adjustment in the vertical direction is described in detail in FIGS. 6A and 6B.

FIG. 5 shows an example of a satellite antenna in which the wire 50 with marks 51 is installed between the reference member 44 and the reflection plate 10 and notch marks 10b are formed on the reflection surface 10a of the reflection plate 10, perpendicular to the marks 51. As above, the ring covers 42 includes the structure of coupling the wire 50, and a structure which can accurately set an azimuth angle and an angle of elevation with respect to the celestial body or a particular static satellite can be realized.

Industrial Applicability

As described above, according to the LNB holder for a satellite antenna according to the present invention, in an antenna method for setting the position of the satellite antenna by calculating the relative position between a reference object such as the celestial body or a particular geographic object and a particular static satellite, a means for finely adjusting the LNB holder in the vertical and horizontal directions is provided at the LNB holder itself. Thus, when the position of a feed horn is deviated after installation, only by a simply manipulation of inserting and moving the position of the holder base vertically and sliding the ring covers horizontally, after unscrewing the coupling screw, the changed position of the feed horn can be conveniently and finely adjusted so that a focus error can be corrected and radio waves can always be received in an optimal state.

Thus, without using technical experts or other expensive equipments, a user can directly correct a slight deviation so that additional maintenance cost for the adjustment of the direction of the antenna can be remarkably reduced.

While this invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

What is claimed is:

1. An LNB holder for a satellite antenna comprising: an arm end cap capped on one end portion of an LNB arm of the satellite antenna and having an uneven surface uniformly formed on outer surfaces of the opposite sides along the lengthwise direction of the LNB arm; a holder base in which the width of an inner side surface is formed greater than the width of an outer side surface of the arm end cap, a cap insertion portion into which the arm end cap is inserted is formed open at one side thereof, an uneven surface contacting each of the uneven surfaces of the arm end cap is formed on each inner side surface of the opposite sides of the cap insertion portion, and a guide rail portion having a horizontal movement guide groove guiding a horizontal sliding of a horizontal movement guide is formed at the outer side of a closed end portion thereof; and a pair of upper and lower ring covers encompassing with pressure around a connection portion between a feed horn and an LNB and having a symmetrical shape as the upper and lower ring covers are assembled by coupling screws, and having the horizontal movement guide inserted into the horizontal movement guide groove and capable of sliding in the horizontal direction is integrally formed with a lower end portion of the lower ring cover.

2. The LNB holder as claimed in claim 1, wherein a slot is formed in each of the opposite side surfaces of the holder base in a widthwise direction, a screw hole is formed in each of the opposite side surfaces of the arm end cap, the arm end cap is inserted into the holder base and disposed at a predetermined position thereof and the height of the feed horn is adjusted, and the position of the arm end cap in the holder base is fixed by coupling the arm end cap and the holder base using coupling screws through the slot and the screw hole.

3. The LNB holder as claimed in claim 1, wherein notch marks are formed at each of the holder base and the arm end cap to recognize the vertical positions of the holder base and the arm end cap which are coupled via the uneven surfaces.

4. The LNB holder as claimed in claim 1, wherein a hook portion is formed around an open end of the arm end cap so that, when the holder base is inserted around the arm end cap, the holder base is prevented from being further inserted.

5. The LNB holder as claimed in claim 1, wherein a screw hole penetrating the horizontal movement guide groove is formed in the guide rail portion of the holder base, a slot is formed in the horizontal movement guide of the lower ring cover in the horizontal direction, and the horizontal movement guide is inserted disposed at a predetermined position of the guide rail portion so that the horizontal position of the feed horn is adjusted, and the position of the horizontal movement guide is fixed by using the coupling screw through the screw hole and the slot.

6. The LNB holder as claimed in claim 1, wherein notch marks are formed at each of the horizontal movement guide of the lower ring cover and the guide rail portion of the holder base to recognize the horizontal position of the horizontal movement guide inserted in the horizontal movement guide groove.

7. The LNB holder as claimed in claim 1, wherein a reference member for identifying the position of the ring cover protrudes upward at the center of the upper portion of the upper ring cover.

8. The LNB holder as claimed in claim 7, wherein an apex is formed at the center of the reference member and a hook and a hook hole for hooking a wire are formed at one side thereof.

9. The LNB holder as claimed in claim 1, wherein an auxiliary fixing ring for pressing and fixing a connection portion connecting the feed horn and the LNB and having a relatively small diameter is provided inside the ring covers.

10. The LNB holder as claimed in claim 9, wherein, in the auxiliary fixing ring, a severed portion enabling one side thereof extended according to the diameter of the connection portion connecting the feed horn and the LNB, is formed, and a groove is formed in the inner surface opposite to the severed portion to facilitate the extension of the auxiliary fixing ring, and a plurality of protrusions are formed in the cylindrical direction to firmly fixed the LNB connection portion are formed on the inner circumferential surface of the auxiliary fixing ring at an identical interval.

11. The LNB holder as claimed in claim 9, wherein an escape prevention protrusion is formed on and along the outer circumferential surface of the auxiliary fixing ring and a plurality of accommodation grooves are formed in and along the inner circumferential surface of each of the ring covers so that the escape prevention protrusion is accommodated in the accommodation grooves and fixed therein.

12. An LNB holder for a satellite antenna comprising: an arm end cap capped on one end portion of an LNB arm of the satellite antenna; a holder base in which the width of an inner side surface is formed greater than the width of an outer side surface of the arm end cap, a cap insertion portion into which the arm end cap is inserted is formed open at one side thereof, and a guide rail portion having a horizontal movement guide groove guiding a horizontal sliding of a horizontal movement guide is formed at the outer side of a closed end portion thereof; and a pair of upper and lower ring covers encompassing with pressure around a connection portion between a feed horn and an LNB and having a symmetrical shape as the upper and lower ring covers are assembled by coupling screws, and having the horizontal movement guide inserted into the horizontal movement guide groove and capable of sliding in the horizontal direction is integrally formed with a lower end portion of the lower ring cover.