WO2009035285A2 - Receiving apparatus satellite signal, antenna and method for receiving satellite signal thereof - Google Patents

Receiving apparatus satellite signal, antenna and method for receiving satellite signal thereof Download PDF

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Publication number
WO2009035285A2
WO2009035285A2 PCT/KR2008/005400 KR2008005400W WO2009035285A2 WO 2009035285 A2 WO2009035285 A2 WO 2009035285A2 KR 2008005400 W KR2008005400 W KR 2008005400W WO 2009035285 A2 WO2009035285 A2 WO 2009035285A2
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WO
WIPO (PCT)
Prior art keywords
reflection plate
wave guide
guide tube
satellite signal
signal reception
Prior art date
Application number
PCT/KR2008/005400
Other languages
French (fr)
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WO2009035285A3 (en
Inventor
Chung Hyun Kim
Original Assignee
A & P Technology Co.
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Publication date
Application filed by A & P Technology Co. filed Critical A & P Technology Co.
Publication of WO2009035285A2 publication Critical patent/WO2009035285A2/en
Publication of WO2009035285A3 publication Critical patent/WO2009035285A3/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
    • H01Q19/134—Rear-feeds; Splash plate feeds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/193—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface with feed supported subreflector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/16—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device
    • H01Q3/20—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device wherein the primary active element is fixed and the reflecting device is movable

Definitions

  • the present invention relates to a satellite signal reception apparatus and satellite signal reception antenna and method using the satellite signal reception apparatus that is capable of improving satellite signal reception efficiency by adjusting the position of an auxiliary reflection plate adaptively to the size and paraboloid of a main reflection plate.
  • parabolic antennas In order to receive satellite signals, typically, parabolic antennas are used.
  • a parabolic antenna is a high gain reflector having a parabolic metal surface designed to focus on a specific broadcast source and used for satellite radio and television broadcast signals due to its superiority in reception gain and efficiency.
  • a geostationary satellite orbiting along the equator 35,000 ⁇ 36, 000km above the earth surface receives a signal transmitted by a broadcast station and broadcasts the signal to a specific region on the earth.
  • the broadcast signal is received through the satellite antenna and processed by a satellite broadcast receiver to be output on the television.
  • the broadcast satellite is equipped with a receiver appropriate for receiving Super High Frequency (SHF) signal in the range of 3 and 13 GHz.
  • SHF Super High Frequency
  • VHF Very High Frequency
  • UHF Ultra High Frequency
  • the transceiver antenna has to be implemented with a tracking function for tracking the target satellite as well as the high directivity.
  • the structure and function of a conventional satellite signal reception antenna is described with reference to a drawing.
  • FIG. 1 is a perspective view illustrating a conventional satellite signal reception antenna system.
  • the conventional satellite signal reception antenna system 10 consists of a reflection plate 11 formed in the shape of a parabolic dish supported by a support 12 and a Low Noise Block (LNB) 14 which is fixedly suspended at the focus of the reflection plate 11 by means of fixing members 13.
  • LNB Low Noise Block
  • a satellite signal is reflected by the reflection plate 11 of the conventional satellite signal reception antenna 10 so as to be focused on the LNB 14 and then processed to be output on the television screen in the form of visual image.
  • FIG. 2 is a side elevational view illustrating another conventional satellite signal reception antenna system disclosed in Korean Patent No. 0599610 entitled "Satellite tracking antenna system and method using rotation cycle compensation of auxiliary reflection plate".
  • the conventional satellite signal reception antenna system includes a reflection plate 310 orientating to a target satellite for receiving broadcast signals, an auxiliary reflection plate 320 guiding the signal focused thereon into a wave guide 340, an absolute position measurement bar 321 installed on the auxiliary reflection plate 320 for measuring rotation cycle of the auxiliary reflection plate 320, a rotation member 330 for rotating the auxiliary reflection plate 320, a detection member 331 for generating interrupt signal whenever the passage of the absolute position measurement bar 321 is detected, a dielectric lens 341 for shaping the satellite signal beam focused on the auxiliary reflection plate 320, an inlet wave guide 340 for delivering the satellite signal beam shaped by the dielectric lens 341 to a satellite signal processor 360, a reflection plate driving unit 350 for aligning position of the reflection plate 310, and an antenna control unit 360 including
  • the reflection plate driving unit 350 includes an azimuth motor 351 for rotating the reflection plate 310 on a vertical axis, a rotation plate 352 rotating in accordance with the rotation direction of the reflection plate driving unit 350, an elevation motor 353 for rotating the reflection plate 310 on a horizontal axis, and a driven pulley rotating in association with a driving pulley engaged by means of a belt 255 according to the rotation of the azimuth motor 351.
  • the second conventional satellite signal reception antenna controls such that the auxiliary reflection plate 320 tilts vertically or horizontally relative to the rotation axis of the reflection plate 310 while rotating in high speed, performs sampling on the satellite signals reflected from the auxiliary reflection plate 320 at more than one specific position, generates a position compensation signal for aligning the antenna at one of the specific positions, and orientates the antenna 310 to the target satellite on the basis of the position compensation signal.
  • the receiver is arranged in front of the antenna to receive the directly reflected satellite signals.
  • the first conventional satellite signal reception antenna system has drawbacks in that the fixing members required for supporting the receiver increases the size of the antenna, and the fixed receiver makes difficult to adjust its orientation for increasing satellite signal reception inefficiency.
  • the second conventional satellite signal reception antenna system is configured such that the auxiliary reflection plate positioned in front of the antenna rotates to tilt.
  • the second conventional satellite signal reception antenna system has a drawback in that the auxiliary reflection plate cannot be compensated in its position relative to the reflection plate, thereby failing maintenance or improvement of signal reception efficiency.
  • the present invention provides a satellite signal reception system that is capable of improving signal reception efficiency and reducing size of antenna by configuring an auxiliary reflection plate to be adjusted in position and to guide the signals focused thereon, by a reflection plate, into a wave guide.
  • a satellite signal reception apparatus installed on a main reflection plate of an antenna system for collecting satellite signals reflected by the main reflection plate includes a wave guide tube mounted at a center of the main reflection plate, an auxiliary reflection plate positioned above an inlet of the wave guide tube for re-reflecting the satellite signals reflected by the main reflection plate into the wave guide tube, and a position adjustment unit mounted on the wave guide tube for adjusting distance between the main and auxiliary reflection plates.
  • a satellite signal reception antenna includes a main reflection plate for focusing satellite signals at a focal point, a wave guide tube of which one end is fixed at a center of the main reflection plate, an auxiliary reflection plate installed above an inlet opening of the other end of the wave guide tube for re-reflecting the satellite signal reflected by the main reflection plate into the wave guide tube, and a position adjustment unit mounted around the wave guide tube for adjusting a position of the auxiliary reflection plate relative to the main reflection plate.
  • a method for collecting satellite signals reflected by a main reflection plate of a satellite signal reception antenna includes installing a wave guide tube at a center of the main reflection plate for guiding the satellite signal reflected by the main reflection plate, installing an auxiliary reflection plate above an inlet of the wave guide tube for concentrating the satellite signals reflected by the main reflection plate into the wave guide tube, a distance of the auxiliary reflection plate from the main reflection plate being adjustable, and fixing the auxiliary- reflection plate at a position optimizing amount of the satellite signals guided into the wave guide tube by moving the auxiliary reflection plate along the wave guide tube.
  • the satellite signal reception antenna of the present invention enables an auxiliary reflection plate facing a main reflection plate to concentrate the satellite signals reflected by the main reflection plate into a wave guide tube, thereby improving signal reception efficiency without increasing size of the antenna.
  • the satellite signal reception antenna of the present invention is configured such that the auxiliary reflection plate can be placed at the focal point of the main reflection plate without support bridges for suspending the auxiliary reflection plate, the bridges interfering collection of satellite signals, resulting in improvement of the signal reception efficiency.
  • the satellite signal reception antenna of the present invention allows adjusting the height of the wave guide and the position of the auxiliary reflection plate relative to the inlet of the wave guide so as to place the auxiliary reflection plate at an optimal position.
  • the auxiliary reflection plate position adjustability allows the satellite signal reception apparatus to be applied to various sizes of the main reflection plates and enables compensating the degradation of antenna gain caused by the mechanical error of mass produced antenna, resulting in improvement of productivity.
  • FIG. 1 is a perspective view illustrating a conventional satellite signal reception antenna system
  • FIG. 2 is a side elevational view illustrating another conventional satellite signal reception antenna system
  • FIG. 3 is a perspective view illustrating a satellite signal reception antenna according to an exemplary embodiment of the present invention
  • FIG. 4 is a perspective view illustrating a satellite signal reception apparatus according to an exemplary embodiment of the present invention.
  • FIG. 5 is a cross-sectional view illustrating a satellite signal reception antenna of FIG. 3. ⁇ list of reference numerals and elements >
  • hole 120 wave guide tube
  • 121 body 121a: height adjustment member 121b: threaded external surface 122: guide inlet 123: collection ring 130 : auxiliary reflection plate
  • fixation bolt 144 bridging bar
  • FIG. 3 is a perspective view illustrating a satellite signal reception antenna according to an exemplary embodiment of the present invention
  • FIG. 4 is a perspective view illustrating a satellite signal reception apparatus according to an exemplary embodiment of the present invention.
  • the satellite signal reception antenna 100 which is an antenna for use in satellite radio communication system or satellite broadcast signal reception system, includes a main reflection plate 110 and a satellite signal reception apparatus 150 installed on the main reflection plate 110 for collecting the signals reflected from the main reflection plate 110.
  • the satellite signal reception apparatus 150 includes a wave guide tube 120 fixed on the main reflection plate 110, an auxiliary reflection plate 130 arranges at an inlet of the wave guide tube 120, and a position adjustment unit 140 for adjusting the position of the auxiliary reflection plate 130. Since the satellite signal reception apparatus 150 is a part of the satellite signal reception antenna 100, the internal components of the satellite signal reception apparatus 150 are described in association with the satellite signal reception antenna 100.
  • the satellite signal reception antenna 100 can be implemented in the form of a satellite tracking function- enabled antenna system that tracks the position of a target satellite in accordance with the movement of the object as well as a fixed antenna system.
  • the main reflection plate 110 is formed having a parabolic reflection surface 111 for focusing the satellite signals at a point and a hole 112 (see FIG. 5) penetrating the main reflection plate 110 at the center of the parabolic reflection surface 111.
  • the wave guide tube 120 includes a body 121 of which one end is fixed at the center of the main reflection plate 110, a guide inlet 122 formed at the other end of the body 121, and a collection ring 123 mounted around the guide inlet 122.
  • the body 121 is arranged perpendicularly to the parabolic reflection surface 111 at the hole 112 so as to form a signal path.
  • the body is made of a conductive metallic material such as copper.
  • the wave guide tube 120 is provided with a cylindrical height adjustment member 121a of which one end is fixed to the main reflection plate 110 around the hole 112 and the other end is screw-coupled to the the body 121 so as to adjust the height of the wave guide tube 120 by screwing up and down. Accordingly, the wave guide tube 120 can align the auxiliary reflection plate 130 at the focal point of the main reflection plate 110 that is determined depending on the size of the main reflection plate 110.
  • the height adjustment member 121 is screw- coupled to the bottom end of the body 121 in this embodiment, it can be screw-coupled to the top end or in the middle of the body 121.
  • the height adjustment member 121 is provided with a flange, having a plurality of holes arranged circumferentially, formed around its bottom end so as to be fixed on the main reflection plate 110 by means of bolts or screws.
  • the guide inlet 122 is coupled to the top end of the body 121 by interference fit.
  • the guide inlet 122 is preferably made of Teflon to penetrate the satellite signals reflected by the main reflection plate 110 and formed in the shape of a funnel to guide the satellite signals reflected by the auxiliary reflection plate 130 into the body 12.
  • the collection ringl23 is mounted around the guide inlet 122 and is preferably made of a conductive metallic material such as copper or a resin material plated with a conductive metal such that the satellite signals reflected by the auxiliary reflection plate 130 are not distributed but concentrated into the body 121.
  • the auxiliary reflection plate 130 is arranged at a predetermined distance from the opening of the wave guide tube 120 so as to re-reflect the satellite signal reflected by the main reflection plate 110 into the wave guide tube 120.
  • the position adjustment unit 140 is configured to move up and down to adjust the distance between the main and auxiliary reflection plates 110 and 130 so as to place the auxiliary reflection plate 130 is positioned at the focal point of the paraboloid of the main reflection plate 110.
  • the position adjustment unit 140 is preferably moving along the longitudinal axis of the wave guide tube 120 to place the auxiliary reflection plate 130 at the focal point of the main reflection plate in order to increasing the re-reflectivity of the auxiliary reflection plate.
  • the position adjustment unit 140 includes a screw coupler 141 screw-coupled around the wave guide tube 120, a support member 142 connected to the screw coupler 141 and holds the auxiliary reflection plate 130, and a fixation bolt 143 for fixing the screw coupler to the body 121 of the wave guide tube 120.
  • the screw coupler 141 has a threaded internal surface and is screw-coupled to a threaded external surface 121b of the body 121 of the wave guide tube 120 so as to move up and down along the wave guide tube 120.
  • the support member 142 is connected to the screw coupler 141 by means of a few bridging bars 144 in order to minimize interference to the satellite signals and moves up and down according to the rotation direction of the screw coupler 141.
  • the fixation bolt 143 is inserted through a threaded hole to press the external surface of the body 121 of the wave guide tube 120 such that the screw coupler 141 is fixed to the wave guide.
  • the auxiliary reflection plate 130 can be formed in various shapes.
  • the auxiliary reflection plate 130 is implemented in the form of a circular cone protruded to the wave guide tube 120.
  • the auxiliary reflection plate 130 is connected to a rotation shaft 132 of a rotation motor 131 fixed to the support member 142 by means of a bracket 142a such that the auxiliary reflection plate 130 rotates by the driving force of the rotation motor 131 and tilts in a direction relative to the rotation shaft 132.
  • the main reflection plate 100 is provided with a Low Noise Block (LNB) (not shown) for amplifying the satellite signals attenuated while passing through the stratosphere and atmosphere and removing interference and noise from the received satellite signals.
  • LNB Low Noise Block
  • the LNB is installed on the opposite surface of the parabolic surface such that the satellite signals are input the the LNB through the wave guide tube 120 and the hole 112.
  • the satellite signal reception method includes a wave guide installation procedure, an auxiliary reflection plate installation procedure, and signal reception optimization procedure.
  • the wave guide tube 120 is fixed at the center of the main reflection plate 110 for guiding the satellite signals. At this time, it is preferred to install the wave guide tube 120 such that the longitudinal axis of the wave guide tube 120 passes the center of the main reflection plate 110 and focal point of the paraboloid of the main reflection plate 110.
  • the auxiliary reflection plate 130 is installed at the inlet opening of the wave guide tube 120 by adjusting the distance from the main reflection plate
  • the auxiliary reflection plate 130 is adjusted and fixed at an optimal position to maximize the satellite signals reflected into the wave guide tube 120.
  • the position of the auxiliary reflection plate 130 can be adjusted in various manners.
  • the auxiliary reflection plate 130 moves up and down along the body 121 of the wave guide tube 120 by screwing up and down the position adjustment unit 140 and positioned at the focal point of the main reflection plate 110, resulting in improvement of the signal reception efficiency.
  • the screw coupler 141 of the position adjustment unit 140 is fixed to the body 121 of the wave guide tube 120 by screwing up the fixation bolt 143.
  • the height of the wave guide tube 120 is adjusted by screwing up and down the wave guide tube 120 to the height adjustment member 121a for positioning the auxiliary reflection plate 130 at a position maximizing the amount of the satellite signals guided into the wave guide tube 120.
  • the optimal position of the auxiliary reflection plate 130 for maximizing the amount of the satellite signals i.e. the focal point, may vary depending on the paraboloid, structure, and size of the main reflection plate 110.
  • the satellite signals reflected by the main reflection plate 110 is focused on the auxiliary reflection plate 130 placed at the focal point of the main reflection plate 110 such that the satellite signals are guided to the LNB through the wave guide tube 120.
  • the LNB converts the satellite signals to Intermediate frequency (IF) signals, removes interference and noise from the IF signals, and sends the signals to the receiver.
  • IF Intermediate frequency
  • the auxiliary reflection plate 130 is rotated by the rotation motor 131 while tilted relative to the rotation shaft 132.
  • the control unit compares the signal strengths received when the auxiliary reflection plate 130 is tilted in every direction, determines the gradient of an orientation direction of the main reflection plate 110 on the basis of the comparison results, generates a position correction signal on the basis of the gradient, and corrects the orientation direction of the main reflection plate 110 according to the position correction signal, resulting in improvement of the signal reception efficiency of the antenna .
  • the auxiliary reflection plate 130 is positioned facing the main reflection plate 110 to guide the satellite signals reflected by the main reflection plate 110 into the wave guide tube 120, other components such as the LNB are not required to be arranged on the reflection surface of the main reflection plate 110, thereby reducing the size of the antenna while improving the signal reception efficiency. Also, since the position of the auxiliary reflection plate 130 and the height of the wave guide tube 120 can be adjusted by means of the respective position adjustment unit 140 and height adjustment member 121a, the auxiliary reflection plate 119 can be aligned at an optimal position adaptive to the size and shape of the paraboloid of the main reflection plate 110.

Abstract

A satellite signal reception apparatus and satellite signal reception antenna and method using the satellite signal reception apparatus is provided for improving satellite signal reception efficiency by adjusting the position of an auxiliary reflection plate adaptively to the size and paraboloid of a main reflection plate. The satellite signal reception apparatus of the present invention is installed on a main reflection plate of an antenna system for collecting satellite signals reflected by the main reflection plate and includes a wave guide tube mounted at a center of the main reflection plate, an auxiliary reflection plate positioned above an inlet of the wave guide tube for re- reflecting the satellite signals reflected by the main reflection plate into the wave guide tube, and a position adjustment unit mounted on the wave guide tube for adjusting distance between the main and auxiliary reflection plates. The satellite signal reception antenna of the present invention enables an auxiliary reflection plate facing a main reflection plate to concentrate the satellite signals reflected by the main reflection plate into a wave guide tube, thereby improving signal reception efficiency without increasing size of the antenna. The satellite signal reception apparatus of the present invention allows adjusting the height of the wave guide and the position of the auxiliary reflection plate relative to the main reflection plate so as to be adapted to various sizes of parabolic main reflection plates.

Description

Invention Title
RECEIVING APPARATUS SATELLITE SIGNAL, ANTENNA AND METHOD FOR RECEIVING SATELLITE SIGNAL THEREOF
Technical Field
The present invention relates to a satellite signal reception apparatus and satellite signal reception antenna and method using the satellite signal reception apparatus that is capable of improving satellite signal reception efficiency by adjusting the position of an auxiliary reflection plate adaptively to the size and paraboloid of a main reflection plate.
Background Art In order to receive satellite signals, typically, parabolic antennas are used. A parabolic antenna is a high gain reflector having a parabolic metal surface designed to focus on a specific broadcast source and used for satellite radio and television broadcast signals due to its superiority in reception gain and efficiency.
In the case of satellite broadcast, a geostationary satellite orbiting along the equator 35,000 ~ 36, 000km above the earth surface receives a signal transmitted by a broadcast station and broadcasts the signal to a specific region on the earth. The broadcast signal is received through the satellite antenna and processed by a satellite broadcast receiver to be output on the television. With the high definition image and crystal clear sound of the satellite broadcast services while minimizing shadow area, the popularity of the satellite broadcast receiver has been increasing in recent years. The broadcast satellite is equipped with a receiver appropriate for receiving Super High Frequency (SHF) signal in the range of 3 and 13 GHz. Since the SHF signal is sensitive to obstacles such as rain, cloud, buildings, and trees, in comparison with Very High Frequency (VHF) signal of 3 - 30MHz and Ultra High Frequency (UHF) signal of 30MHz ~ 3GHz, a high performance reception antenna such as parabolic antenna is required to secure quality of the received signal.
In the case of satellite radio communication, since the high frequency waves in the microwave frequency band have strong straight travel feature, the transceiver antenna has to be implemented with a tracking function for tracking the target satellite as well as the high directivity. The structure and function of a conventional satellite signal reception antenna is described with reference to a drawing.
FIG. 1 is a perspective view illustrating a conventional satellite signal reception antenna system. As shown in FIG. 1, the conventional satellite signal reception antenna system 10 consists of a reflection plate 11 formed in the shape of a parabolic dish supported by a support 12 and a Low Noise Block (LNB) 14 which is fixedly suspended at the focus of the reflection plate 11 by means of fixing members 13.
With this structure, a satellite signal is reflected by the reflection plate 11 of the conventional satellite signal reception antenna 10 so as to be focused on the LNB 14 and then processed to be output on the television screen in the form of visual image.
FIG. 2 is a side elevational view illustrating another conventional satellite signal reception antenna system disclosed in Korean Patent No. 0599610 entitled "Satellite tracking antenna system and method using rotation cycle compensation of auxiliary reflection plate". As shown in FIG. 2, the conventional satellite signal reception antenna system includes a reflection plate 310 orientating to a target satellite for receiving broadcast signals, an auxiliary reflection plate 320 guiding the signal focused thereon into a wave guide 340, an absolute position measurement bar 321 installed on the auxiliary reflection plate 320 for measuring rotation cycle of the auxiliary reflection plate 320, a rotation member 330 for rotating the auxiliary reflection plate 320, a detection member 331 for generating interrupt signal whenever the passage of the absolute position measurement bar 321 is detected, a dielectric lens 341 for shaping the satellite signal beam focused on the auxiliary reflection plate 320, an inlet wave guide 340 for delivering the satellite signal beam shaped by the dielectric lens 341 to a satellite signal processor 360, a reflection plate driving unit 350 for aligning position of the reflection plate 310, and an antenna control unit 360 including a cycle control module and position/speed controller to which the satellite signal guided by the inlet wave guide is delivered and a satellite information analyzer.
The reflection plate driving unit 350 includes an azimuth motor 351 for rotating the reflection plate 310 on a vertical axis, a rotation plate 352 rotating in accordance with the rotation direction of the reflection plate driving unit 350, an elevation motor 353 for rotating the reflection plate 310 on a horizontal axis, and a driven pulley rotating in association with a driving pulley engaged by means of a belt 255 according to the rotation of the azimuth motor 351.
The second conventional satellite signal reception antenna controls such that the auxiliary reflection plate 320 tilts vertically or horizontally relative to the rotation axis of the reflection plate 310 while rotating in high speed, performs sampling on the satellite signals reflected from the auxiliary reflection plate 320 at more than one specific position, generates a position compensation signal for aligning the antenna at one of the specific positions, and orientates the antenna 310 to the target satellite on the basis of the position compensation signal.
In the first conventional satellite signal reception antenna system, the receiver is arranged in front of the antenna to receive the directly reflected satellite signals. However, the first conventional satellite signal reception antenna system has drawbacks in that the fixing members required for supporting the receiver increases the size of the antenna, and the fixed receiver makes difficult to adjust its orientation for increasing satellite signal reception inefficiency.
The second conventional satellite signal reception antenna system is configured such that the auxiliary reflection plate positioned in front of the antenna rotates to tilt. However, the second conventional satellite signal reception antenna system has a drawback in that the auxiliary reflection plate cannot be compensated in its position relative to the reflection plate, thereby failing maintenance or improvement of signal reception efficiency.
Disclosure Technical Problem
In order to overcome the problems of the above prior arts, the present invention provides a satellite signal reception system that is capable of improving signal reception efficiency and reducing size of antenna by configuring an auxiliary reflection plate to be adjusted in position and to guide the signals focused thereon, by a reflection plate, into a wave guide.
Technical Solution In accordance with an exemplary embodiment of the present invention, a satellite signal reception apparatus installed on a main reflection plate of an antenna system for collecting satellite signals reflected by the main reflection plate includes a wave guide tube mounted at a center of the main reflection plate, an auxiliary reflection plate positioned above an inlet of the wave guide tube for re-reflecting the satellite signals reflected by the main reflection plate into the wave guide tube, and a position adjustment unit mounted on the wave guide tube for adjusting distance between the main and auxiliary reflection plates.
In accordance with another exemplary embodiment of the present invention, a satellite signal reception antenna includes a main reflection plate for focusing satellite signals at a focal point, a wave guide tube of which one end is fixed at a center of the main reflection plate, an auxiliary reflection plate installed above an inlet opening of the other end of the wave guide tube for re-reflecting the satellite signal reflected by the main reflection plate into the wave guide tube, and a position adjustment unit mounted around the wave guide tube for adjusting a position of the auxiliary reflection plate relative to the main reflection plate.
In accordance with another exemplary embodiment of the present invention, a method for collecting satellite signals reflected by a main reflection plate of a satellite signal reception antenna includes installing a wave guide tube at a center of the main reflection plate for guiding the satellite signal reflected by the main reflection plate, installing an auxiliary reflection plate above an inlet of the wave guide tube for concentrating the satellite signals reflected by the main reflection plate into the wave guide tube, a distance of the auxiliary reflection plate from the main reflection plate being adjustable, and fixing the auxiliary- reflection plate at a position optimizing amount of the satellite signals guided into the wave guide tube by moving the auxiliary reflection plate along the wave guide tube.
Advantageous Effects The satellite signal reception antenna of the present invention enables an auxiliary reflection plate facing a main reflection plate to concentrate the satellite signals reflected by the main reflection plate into a wave guide tube, thereby improving signal reception efficiency without increasing size of the antenna. Also, the satellite signal reception antenna of the present invention is configured such that the auxiliary reflection plate can be placed at the focal point of the main reflection plate without support bridges for suspending the auxiliary reflection plate, the bridges interfering collection of satellite signals, resulting in improvement of the signal reception efficiency. Also, the satellite signal reception antenna of the present invention allows adjusting the height of the wave guide and the position of the auxiliary reflection plate relative to the inlet of the wave guide so as to place the auxiliary reflection plate at an optimal position. Furthermore, the auxiliary reflection plate position adjustability allows the satellite signal reception apparatus to be applied to various sizes of the main reflection plates and enables compensating the degradation of antenna gain caused by the mechanical error of mass produced antenna, resulting in improvement of productivity.
Description of Drawings The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description in conjunction with the accompanying drawings, in which:
FIG. 1 is a perspective view illustrating a conventional satellite signal reception antenna system;
FIG. 2 is a side elevational view illustrating another conventional satellite signal reception antenna system;
FIG. 3 is a perspective view illustrating a satellite signal reception antenna according to an exemplary embodiment of the present invention; FIG. 4 is a perspective view illustrating a satellite signal reception apparatus according to an exemplary embodiment of the present invention; and
FIG. 5 is a cross-sectional view illustrating a satellite signal reception antenna of FIG. 3. <list of reference numerals and elements >
110: main reflection plate 111: reflection surface
112: hole 120: wave guide tube
121: body 121a: height adjustment member 121b: threaded external surface 122: guide inlet 123: collection ring 130 : auxiliary reflection plate
131: rotation motor 132: rotation shaft
140: position adjustment unit 141: screw coupler 142: support member 142a: bracket
143: fixation bolt 144: bridging bar
150: satellite signal reception apparatus
Mode for Invention Exemplary embodiments of the present invention are described with reference to the accompanying drawings in detail. The same reference numbers are used throughout the drawings to refer to the same or like parts. Detailed description of well-known functions and structures incorporated herein may be omitted to avoid obscuring the subject matter of the present invention. FIG. 3 is a perspective view illustrating a satellite signal reception antenna according to an exemplary embodiment of the present invention, and FIG. 4 is a perspective view illustrating a satellite signal reception apparatus according to an exemplary embodiment of the present invention. Referring to FIG. 3, the satellite signal reception antenna 100, which is an antenna for use in satellite radio communication system or satellite broadcast signal reception system, includes a main reflection plate 110 and a satellite signal reception apparatus 150 installed on the main reflection plate 110 for collecting the signals reflected from the main reflection plate 110. The satellite signal reception apparatus 150 includes a wave guide tube 120 fixed on the main reflection plate 110, an auxiliary reflection plate 130 arranges at an inlet of the wave guide tube 120, and a position adjustment unit 140 for adjusting the position of the auxiliary reflection plate 130. Since the satellite signal reception apparatus 150 is a part of the satellite signal reception antenna 100, the internal components of the satellite signal reception apparatus 150 are described in association with the satellite signal reception antenna 100. The satellite signal reception antenna 100 can be implemented in the form of a satellite tracking function- enabled antenna system that tracks the position of a target satellite in accordance with the movement of the object as well as a fixed antenna system.
The main reflection plate 110 is formed having a parabolic reflection surface 111 for focusing the satellite signals at a point and a hole 112 (see FIG. 5) penetrating the main reflection plate 110 at the center of the parabolic reflection surface 111.
The wave guide tube 120 includes a body 121 of which one end is fixed at the center of the main reflection plate 110, a guide inlet 122 formed at the other end of the body 121, and a collection ring 123 mounted around the guide inlet 122.
The body 121 is arranged perpendicularly to the parabolic reflection surface 111 at the hole 112 so as to form a signal path. Particularly, the body is made of a conductive metallic material such as copper. The wave guide tube 120 is provided with a cylindrical height adjustment member 121a of which one end is fixed to the main reflection plate 110 around the hole 112 and the other end is screw-coupled to the the body 121 so as to adjust the height of the wave guide tube 120 by screwing up and down. Accordingly, the wave guide tube 120 can align the auxiliary reflection plate 130 at the focal point of the main reflection plate 110 that is determined depending on the size of the main reflection plate 110.
Although the height adjustment member 121 is screw- coupled to the bottom end of the body 121 in this embodiment, it can be screw-coupled to the top end or in the middle of the body 121.
The height adjustment member 121 is provided with a flange, having a plurality of holes arranged circumferentially, formed around its bottom end so as to be fixed on the main reflection plate 110 by means of bolts or screws.
The guide inlet 122 is coupled to the top end of the body 121 by interference fit. The guide inlet 122 is preferably made of Teflon to penetrate the satellite signals reflected by the main reflection plate 110 and formed in the shape of a funnel to guide the satellite signals reflected by the auxiliary reflection plate 130 into the body 12.
The collection ringl23 is mounted around the guide inlet 122 and is preferably made of a conductive metallic material such as copper or a resin material plated with a conductive metal such that the satellite signals reflected by the auxiliary reflection plate 130 are not distributed but concentrated into the body 121. The auxiliary reflection plate 130 is arranged at a predetermined distance from the opening of the wave guide tube 120 so as to re-reflect the satellite signal reflected by the main reflection plate 110 into the wave guide tube 120.
The position adjustment unit 140 is configured to move up and down to adjust the distance between the main and auxiliary reflection plates 110 and 130 so as to place the auxiliary reflection plate 130 is positioned at the focal point of the paraboloid of the main reflection plate 110.
The position adjustment unit 140 is preferably moving along the longitudinal axis of the wave guide tube 120 to place the auxiliary reflection plate 130 at the focal point of the main reflection plate in order to increasing the re-reflectivity of the auxiliary reflection plate. The position adjustment unit 140 includes a screw coupler 141 screw-coupled around the wave guide tube 120, a support member 142 connected to the screw coupler 141 and holds the auxiliary reflection plate 130, and a fixation bolt 143 for fixing the screw coupler to the body 121 of the wave guide tube 120.
The screw coupler 141 has a threaded internal surface and is screw-coupled to a threaded external surface 121b of the body 121 of the wave guide tube 120 so as to move up and down along the wave guide tube 120. The support member 142 is connected to the screw coupler 141 by means of a few bridging bars 144 in order to minimize interference to the satellite signals and moves up and down according to the rotation direction of the screw coupler 141.
The fixation bolt 143 is inserted through a threaded hole to press the external surface of the body 121 of the wave guide tube 120 such that the screw coupler 141 is fixed to the wave guide.
In order to guide the satellite signal reflected by the main reflection plate 110 into the wave guide tube 120 efficiently, the auxiliary reflection plate 130 can be formed in various shapes. In this embodiment, the auxiliary reflection plate 130 is implemented in the form of a circular cone protruded to the wave guide tube 120. The auxiliary reflection plate 130 is connected to a rotation shaft 132 of a rotation motor 131 fixed to the support member 142 by means of a bracket 142a such that the auxiliary reflection plate 130 rotates by the driving force of the rotation motor 131 and tilts in a direction relative to the rotation shaft 132.
The main reflection plate 100 is provided with a Low Noise Block (LNB) (not shown) for amplifying the satellite signals attenuated while passing through the stratosphere and atmosphere and removing interference and noise from the received satellite signals. Preferably, the LNB is installed on the opposite surface of the parabolic surface such that the satellite signals are input the the LNB through the wave guide tube 120 and the hole 112. The operations and functions of the above structured satellite signal reception antenna 100 are described in more detail in association with a satellite signal reception method according to an exemplary embodiment of the present invention.
The satellite signal reception method according to an exemplary embodiment of the present invention includes a wave guide installation procedure, an auxiliary reflection plate installation procedure, and signal reception optimization procedure.
In the wave guide installation procedure, the wave guide tube 120 is fixed at the center of the main reflection plate 110 for guiding the satellite signals. At this time, it is preferred to install the wave guide tube 120 such that the longitudinal axis of the wave guide tube 120 passes the center of the main reflection plate 110 and focal point of the paraboloid of the main reflection plate 110.
In the auxiliary reflection plate installation procedure, the auxiliary reflection plate 130 is installed at the inlet opening of the wave guide tube 120 by adjusting the distance from the main reflection plate
110 using position adjustment unit 140 for effectively re-reflecting the satellite signal reflected from the main reflection plate 110 into the wave guide tube 120.
In the signal reception optimization procedure, the auxiliary reflection plate 130 is adjusted and fixed at an optimal position to maximize the satellite signals reflected into the wave guide tube 120. Here, the position of the auxiliary reflection plate 130 can be adjusted in various manners. In this embodiment, the auxiliary reflection plate 130 moves up and down along the body 121 of the wave guide tube 120 by screwing up and down the position adjustment unit 140 and positioned at the focal point of the main reflection plate 110, resulting in improvement of the signal reception efficiency. At this time, the screw coupler 141 of the position adjustment unit 140 is fixed to the body 121 of the wave guide tube 120 by screwing up the fixation bolt 143..
Also, the height of the wave guide tube 120 is adjusted by screwing up and down the wave guide tube 120 to the height adjustment member 121a for positioning the auxiliary reflection plate 130 at a position maximizing the amount of the satellite signals guided into the wave guide tube 120. The optimal position of the auxiliary reflection plate 130 for maximizing the amount of the satellite signals, i.e. the focal point, may vary depending on the paraboloid, structure, and size of the main reflection plate 110. After the auxiliary reflection plate 130 is fixed, the satellite signals reflected by the main reflection plate 110 is focused on the auxiliary reflection plate 130 placed at the focal point of the main reflection plate 110 such that the satellite signals are guided to the LNB through the wave guide tube 120. The LNB converts the satellite signals to Intermediate frequency (IF) signals, removes interference and noise from the IF signals, and sends the signals to the receiver.
The auxiliary reflection plate 130 is rotated by the rotation motor 131 while tilted relative to the rotation shaft 132. At this time, the control unit compares the signal strengths received when the auxiliary reflection plate 130 is tilted in every direction, determines the gradient of an orientation direction of the main reflection plate 110 on the basis of the comparison results, generates a position correction signal on the basis of the gradient, and corrects the orientation direction of the main reflection plate 110 according to the position correction signal, resulting in improvement of the signal reception efficiency of the antenna . Since the auxiliary reflection plate 130 is positioned facing the main reflection plate 110 to guide the satellite signals reflected by the main reflection plate 110 into the wave guide tube 120, other components such as the LNB are not required to be arranged on the reflection surface of the main reflection plate 110, thereby reducing the size of the antenna while improving the signal reception efficiency. Also, since the position of the auxiliary reflection plate 130 and the height of the wave guide tube 120 can be adjusted by means of the respective position adjustment unit 140 and height adjustment member 121a, the auxiliary reflection plate 119 can be aligned at an optimal position adaptive to the size and shape of the paraboloid of the main reflection plate 110.
Although exemplary embodiments of ' the present invention have been described in detail hereinabove, it should be clearly understood that many variations and/or modifications of the basic inventive concepts herein taught which may appear to those skilled in the present art will still fall within the spirit and scope of the present invention, as defined in the appended claims.

Claims

CLAIMS Claim 1
A satellite signal reception apparatus installed on a main reflection plate of an antenna system for collecting satellite signals reflected by the main reflection plate, comprising: a wave guide tube mounted at a center of the main reflection plate; an auxiliary reflection plate positioned above an inlet of the wave guide tube for re-reflecting the satellite signals reflected by the main reflection plate into the wave guide tube; and a position adjustment unit mounted on the wave guide tube for adjusting distance between the main and auxiliary reflection plates.
Claim 2
The satellite signal reception apparatus of claim
1, wherein the wave guide tube comprises: a cylindrical body of which one end is fixed at the center of the main reflection plate, the body being made of metallic material; a guide inlet having a shape of a funnel connected at the other end of the body; and a collection ring mounted around the guide inlet, the collection ring being made of a metal or material plated with a conductive metal. Claim 3
The satellite signal reception apparatus of any of claims 1 and 2, wherein the wave guide tube comprises a height adjustment member of which one end is fixed to the main reflection plate and the other end is screw-coupled to the body for adjusting the height of the wave guide tube by screwing up and down.
Claim 4
The satellite signal reception apparatus of claim
1, wherein the position adjustment unit adjusts a position of the auxiliary reflection plate along a longitudinal axis of the wave guide tube.
Claim 5
The satellite signal reception apparatus of any of claims 1 and 4, wherein the position adjustment unit comprises : a screw coupler screw-coupled around the wave guide tube; a support member connected to the screw coupler and supporting the auxiliary reflection plate above the inlet of the wave guide tube; and a fixation bolt for fixing the screw coupler to the wave guide tube. Claim 6
A satellite signal reception antenna comprising: a main reflection plate for focusing satellite signals at a focal point; a wave guide tube of which one end is fixed at a center of the main reflection plate; an auxiliary reflection plate installed above an inlet opening of the other end of the wave guide tube for re-reflecting the satellite signal reflected by the main reflection plate into the wave guide tube; and a position adjustment unit mounted around the wave guide tube for adjusting a position of the auxiliary reflection plate relative to the main reflection plate.
Claim 7
A method for collecting satellite signals reflected by a main reflection plate of a satellite signal reception antenna, comprising: installing a wave guide tube at a center of the main reflection plate for guiding the satellite signal reflected by the main reflection plate; installing an auxiliary reflection plate above an inlet of the wave guide tube for concentrating the satellite signals reflected by the main reflection plate into the wave guide tube, a distance of the auxiliary reflection plate from the main reflection plate being adjustable; and fixing the auxiliary reflection plate at a position optimizing amount of the satellite signals guided into the wave guide tube by moving the auxiliary reflection plate along the wave guide tube.
Claim 8
The method of claim 7, wherein fixing the auxiliary reflection plate comprising adjusting height of the wave guide tube by screwing up and down a height adjustment member interconnected between the wave guide tube and the main reflection plate.
PCT/KR2008/005400 2007-09-12 2008-09-12 Receiving apparatus satellite signal, antenna and method for receiving satellite signal thereof WO2009035285A2 (en)

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