KR100637355B1 - Antenna of Gap Filler - Google Patents

Abstract

The present invention relates to an antenna device for a satellite digital multimedia broadcasting (DMB) repeater (gap filler) used in a shadow area. The satellite relay system to which the present invention is applied includes: a satellite reception antenna for receiving weak digital multimedia broadcasting (DMB) frequency signals from satellites before, after, and in side ratio; A low noise amplifier for amplifying the received signal of the satellite receiving antenna; A repeater for amplifying and relaying the output of the low noise amplifier with high gain; And a relay service antenna for re-copying the output of the repeater to the subscribers in the shadow area at high, forward, and lateral ratios. Here, the satellite receiving antenna is a circular or spherical laminated reflector having a rim with a circular or spherical shape when viewed from the front, a radio wave absorbing dielectric attached to the rim of the reflector, and a horizontal direction inside the reflector. Multiple stages are arranged in the vertical direction, and it is composed of multi-stage Yagi-type or patch-type radiating elements to improve the front gain and improve the front-to-back side ratio by reducing the front (radiation direction) of the antenna.

Digital Multimedia Broadcasting (DMB), Satellite Broadcasting, Relay, Classic Rear Defense, Radio Absorber

Description

Satellite Broadcasting Antenna {Antenna of Gap Filler}             

1 is a schematic diagram illustrating the installation of an antenna for satellite digital multimedia broadcasting (DMB) relay according to the present invention;

2 is a view showing a circular satellite broadcast receiving antenna according to the present invention;

3 is a diagram illustrating a rectangular satellite broadcasting reception antenna according to the present invention;

4 shows a first embodiment of a relay directional service antenna according to the present invention;

5 shows a second embodiment of a directional service antenna for relay according to the present invention;

6 is a diagram illustrating an omnidirectional service antenna for relay according to the present invention;

7A is a radiation pattern diagram of a satellite broadcasting antenna according to the present invention;

7B is a radiation pattern diagram of a directional service transmit antenna for relay according to the present invention;

7C is a radiation pattern diagram when the directional service antenna for relay according to the present invention is arranged in multiple sections;

Figure 7d is a radiation pattern diagram of the relay omni-directional service antenna according to the present invention.

* Explanation of symbols for main parts of the drawings

First

1: Support structure for antenna and repeater installation 2: Bracket

3: service antenna support 5: low noise amplifier

10: satellite receiving antenna 7: repeater

20: service antenna for relay

Second degree

11: Yagi-type somewhat self-radiating antenna or multilayer microstrip patch antenna

12: main reflector 12-1 to 12-4: auxiliary reflector

13: Receiver antenna 14: Snow cover

15: radio wave absorption dielectric 16: fastener

17: main power wire 18: dielectric layer

4th

21: Copy element (dipole type or micro strip patch type)

22: main reflective plate 22-1 to 22-4: auxiliary reflective plate

23: feed connector 24: snow cover

25: radio wave absorption dielectric material 26: fastener

27: Main Line

7a, 7b

F: main radiation beam S: lateral sidelobe beam

B: posterior side beam

(A) Service antenna vertical pattern

(B) Service antenna horizontal pattern

Figure 7c

(A) Three-way sector antenna horizontal radiation pattern

(B) 4-way sector antenna horizontal radiation pattern

7d degree

(A) Omnidirectional antenna horizontal radiation pattern

(B) Omnidirectional antenna vertical radiation patterns

The present invention relates to an antenna for satellite broadcasting relay, and more particularly, to an antenna device for a satellite digital multimedia broadcasting (DMB) repeater (gap filler) used in a shadow area.

In general, digital multimedia broadcasting (DMB) is a mobile multimedia broadcasting that provides high quality voice and video services anytime and anywhere. Based on DAB commercially available in Europe and the United States, video and weather・ It is broadcast sending news data information. Such DMB broadcasting will be divided into satellite DMB and terrestrial DMB, and the satellite DMB will be clearly displayed through mobile phones, car receivers, small TVs, PDAs, etc., even in vehicles running at 150km / h using approximately 2.6GHz band. It is a new concept of mobile broadcasting service. As such, the broadcast can be viewed through a mobile phone, which is a representative convergence service of broadcasting and communication. When a radio wave is launched from a broadcasting center to a satellite, the broadcast is transmitted directly from the satellite to the terminal. At this time, in the shadow area of the city can receive a broadcast through a repeater called "Gap Filler (Gap Filler)", because the satellite can be seen in a clear picture quality anywhere in the country. The satellite DMB channel is scheduled for 39 broadcasting channels, including 11 video, 25 audio, and 3 data, and the video channel will consist of terrestrial retransmission channels and specialized channels such as music, movies, and sports.

On the other hand, in the service of digital multimedia (DMB) TV broadcasting by satellite, a relay system (gap filler) is required because it is impossible to receive in a shaded area where radio waves are weak. Since the signal is re-amplified to the same frequency and then copied again to the service antenna, when using the conventional antenna, radio waves radiated through the service antenna are fed back to the satellite reception antenna, thereby making the relay service impossible.

The present invention has been proposed to solve the above problems, by greatly improving the front and rear side ratios of the satellite reception antenna and the service transmission antenna to greatly improve the transmission and reception separation (for example, -140dB or more) to the obstacles caused by feedback The purpose of the present invention is to provide a satellite broadcasting antenna that can receive a high quality satellite broadcasting frequency radio wave and then amplify and re-copy the radio wave.

In order to achieve the above object, the device of the present invention comprises a satellite reception antenna for receiving a weak digital multimedia broadcasting (DMB) frequency signal from the satellite before, after, side defense; A low noise amplifier for amplifying the received signal of the satellite receiving antenna; A repeater for amplifying and relaying the output of the low noise amplifier with high gain; And a relay service antenna for re-copying the output of the repeater to the subscribers in the shaded area at high, forward and lateral ratios.

Here, the satellite receiving antenna is a circular or spherical laminated reflector having a rim with a circular or spherical shape when viewed from the front, and having a rim, a radio wave absorbing dielectric attached to the rim of the reflector, and a horizontal direction inside the reflector. It is composed of several stages and vertically stacked Yagi-type or patch-type radiation elements, and increases the front gain and improves the front and rear side ratio by reducing the front (radiation direction) of the antenna. At this time, the dipole element or the microstrip radiation element of the satellite reception antenna has a copier attached to a dielectric, and a plurality of inductive waveguides attached in a stack form thereon.

The relay service antenna has a rectangular cylindrical reflector having a spherical shape with one edge open when viewed from the front, an electromagnetic wave absorbing dielectric attached to the edge of the reflector, and one or two stages perpendicular to the inside of the reflector. However, it is characterized by the fact that the wide horizontal direction service is made possible by the arrangement of the radiating elements. In addition, the relay service antenna may be configured as an omni-directional antenna having a side plate side absorption dielectric plate attached to absorb the radio waves radiated laterally to the upper and lower ends of the vertical axis of the antenna.

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

Figure 1 is a schematic diagram showing the overall configuration of the gap filler system according to the present invention, the relay system of the present invention is a satellite receiver antenna 10 for receiving a satellite broadcasting signal of the 2.6GHz band from the satellite, and the received signal low noise A low noise amplifier (LNA) 5 for amplifying the signal, a repeater 7 for amplifying the output of the low noise amplifier 5, and a relay for transmitting a service signal having the same frequency as the satellite reception frequency input from the repeater 7 back to the shadow area. Service transmission antenna 20. Such a gap filler system is installed on the support structure 1 for antenna and repeater installation using a bracket 2 or the like, and a plurality of directional service transmitting antennas 20 are attached to the service antenna support 3 to be used as a multi-section antenna type. Can be.

Referring to FIG. 1, the relay system to which the present invention is applied has a high gain, high posterior defense satellite receiver antenna 10 for receiving satellite radio waves on an upper portion of the support structure 1 to receive weak radio waves from satellites. After amplification in the low noise amplifier (5) and transmitted to the repeater (7), amplified again by the high gain in the repeater (7) and fed to the relay service transmission antenna (20) at a high power, and then copied again to the DMB broadcast relay in the shadow area Provide service.

Figure 2 is a schematic diagram showing a circular configuration of the satellite receiving antenna 10 having a high front and rear ratio shown in Figure 1, (a) is a front view, (b) is cut to the side B-B '. It is sectional drawing, (a) is a flat sectional drawing cut by A-A '.

Referring to FIG. 2, the satellite receiving antenna 10 of the present invention forms a main reflecting plate 12 by forming a metal plate into a cylindrical shape having a front opening and a frame so as to be circular when viewed from the front, and the main reflecting plate 12. After multi-stage installation of high gain, low-magnetism-causing (or multi-layer strip) radiating elements 11 on the front and back, the outputs of the radiating elements 11 are synthesized by the main power supply line 17 to receive antenna connectors. By outputting through (13), it is possible to increase the high gain while reducing the overall diameter. In addition, a plurality of auxiliary reflecting plates 12-1 to 12-4 may be added to the rear surface of the main reflecting plate 12 as the metal plate having the same shape as the main reflecting plate 12, according to the embodiment of the present invention. The auxiliary reflection plates 12-1 to 12-4 were added to further improve the performance. The radiating elements 11 of FIG. 2 are dipoles arranged in a vertical direction and are formed in multiple layers while the copier and the waveguides are separated from each other by the dielectric layer 18.

In addition, the edge of the circular antenna 10 of the present invention is attached to the dielectric 15 for absorbing radio waves to absorb the radiation to the rear and side is configured to have a significant front and rear ratio (60 ~ 70dB), By increasing the front antenna gain, it is possible to obtain high gain with a small structure, light weight and low price, so that the fastener 16 can be easily attached to a simple structure (1) such as a support rod. have. And the front of the antenna is attached to the snowproof, waterproof cover 14 to be able to safely service even in rainy or snowy weather.

FIG. 3 is a schematic view showing a configuration in which the satellite receiver antenna 10 shown in FIG. 1 is implemented in a quadrangle. (A) is a front view, (B) is a side cross-sectional view, (C) is a flat cross-sectional view, and (D) is a An enlarged view of a radiation element.

Referring to FIG. 3, the satellite receiving antenna 10 of the present invention forms a main reflector plate 12 by forming a rectangular plate having a front opening and a rim in a rectangular shape so as to have a rectangular shape when viewed from the front, and the main reflector plate 12. After multi-stage installation of high gain, low-magnetism-causing (or multi-layer strip) radiating elements 11 horizontally and vertically on the front surface of the antenna, the output of each radiating element 11 is combined with a main feed line 17 to receive antennas. By enabling the output through the connector 13, it is possible to increase the high gain while reducing the overall size. In addition, a plurality of auxiliary reflecting plates 12-1 to 12-4 may be added to the rear surface of the main reflecting plate 12 as the metal plate having the same shape as the main reflecting plate 12, according to an embodiment of the present invention. The auxiliary reflection plates 12-1 to 12-4 were added to further improve the performance.

The radiation elements 11 are formed in the dielectric layer 18 in the disk-shaped copier 11-1 and the waveguide patterns 11-2 to 11-4, as shown in (d) of FIG. It consists of a multi-layered strip.

In addition, by attaching a dielectric (15) that can absorb radio waves on the edge of the rectangular antenna 10 of the present invention to absorb radiation to the rear and side dramatically improve the front and rear ratio (60 ~ 70dB), By increasing the front antenna gain, high gain can be achieved with a small structure, light weight, and developed at a low price, so that the fastener 16 can be easily attached to a simple structure such as a support rod. It is. And the front cover of the antenna is attached to the anti-proof, waterproof cover (14).

4 is a first embodiment of the directional service transmitting antenna for relay according to the present invention, (a) is a front view, (b) is a side cross-sectional view, (c) is a flat sectional view.

Referring to FIG. 4, the service transmitting antenna 20 of the present invention is a directional antenna for re-copying and servicing a high frequency signal for service amplified by the repeater 7 input through the feed connector 23 to the subscriber side of the shadow area. The main plate 22 is formed in a rectangular cylindrical shape having a front opening and a rim so that it becomes a vertically long rectangle when viewed from the front, and horizontal radiation (vertical polarization or A single element type radiating element 21 configured to have a wide angle or horizontal polarization or circular polarization) is configured to be serviced in a wide direction by arranging one column or two columns only vertically. At this time, the radiating element 21 is implemented in the dielectric 28 as a disk, and is configured to radiate the high frequency service signal input through the feed connector 23 to the front. In addition, a plurality of auxiliary reflecting plates 22-1 to 22-4 may be added to the rear surface of the main reflecting plate 22 as a metal plate having the same shape as that of the main reflecting plate 22. The auxiliary reflection plates 22-1 to 22-4 are added to further improve the performance.

In addition, the antenna of the service antenna 20 of the present invention is attached to the dielectric 25 for absorbing radio waves to absorb the radiation to the rear and side to increase the front and rear ratio, using the fastener 26 It can be attached easily. And the front surface of the antenna 20 is attached to the snow cover, waterproof cover 24 to be able to safely service even in bad weather rain or snow.

5 is a second embodiment of the directional service antenna for relay according to the present invention, where (a) is a front view, (b) is a side cross-sectional view, and (c) is a flat sectional view.

Referring to FIG. 5, the service antenna 20 of the present invention is a directional antenna for re-copying the high frequency signal for service amplified by the repeater 7 to the subscriber side of the shadow area, and having a vertically long rectangle when viewed from the front. A single element type radiation element 21 configured to form a main reflector plate 22 by forming a metal plate into a rectangular cylindrical shape having a frame so that horizontal (vertical polarization) radiation is wide-angle with low gain on the front surface of the main reflector plate 22. Is arranged so that it can be serviced in a wide direction by arranging 1 or 2 columns vertically only. At this time, the radiating element 21 is embodied in the dielectric 28 as a vertically long pole type, and radiates the high frequency service signal input through the feed connector 23 to the front. In addition, a plurality of auxiliary reflecting plates 22-1 to 22-4 may be added to the rear surface of the main reflecting plate 22 as a metal plate having the same shape as that of the main reflecting plate 22. Auxiliary reflectors 22-1 to 22-4 were added.

In addition, the antenna of the service antenna 20 of the present invention is attached to the radio wave absorption dielectric 25 to absorb the radiation to the rear and side to increase the front and rear ratio, and using the fastener 26 to support the structure ( Easy to attach to 1). And the front cover of the antenna 20 is attached to the anti-proof, waterproof cover 24.

6 is a diagram illustrating a omni-directional service antenna for relay according to the present invention, where (a) is a front view and (b) is a plan view.

Referring to FIG. 6, the omni-directional relay service antenna 20 of the present invention arranges the radiation elements 21 coaxially around the cylindrical omni-directional main power supply line 27, and is disposed outside the radiation element 21. Cylindrical antifog cover 24 is configured to radiate omnidirectional radio wave horizontally, and the disk-shaped wave absorbing dielectric 25 is attached to the upper and lower sides of the cylindrical service antenna so that the total aspect ratio is 65 to 70 dB or more. In order to improve the quality of service, the satellite antenna has no feedback interference. The service antenna 20 can be easily installed by attaching to a service antenna support or the like through the fastener 26.

7A is a radiation pattern diagram of a satellite broadcasting antenna according to the present invention. In FIG. 7A, F represents an omnidirectional vertical / horizontal radiation pattern, Fc represents the highest point (center) of the omnidirectional pattern, S is a lateral radiation pattern, approximately -60 to -70 dBc, and B is a backward radiation pattern. It is approximately -60 to -70 dBc. According to the illustrated pattern, it can be seen that the satellite broadcasting reception antenna 10 of the present invention has a very strong directivity toward the satellite.

7B is a radiation pattern diagram of a directional service antenna for relay according to the present invention. 7B is a vertical direction radiation pattern diagram of a directional service antenna, F is an omnidirectional radiation pattern, Fc is the highest point of the omnidirectional pattern, and S is a lateral radiation pattern, approximately -60 to -70 dBc. , B is a backward radiation pattern of approximately -60 to -70 dBc or less. FIG. 7B (b) is a horizontal radiation pattern diagram of a directional service antenna, F is an omnidirectional radiation pattern, Fc is the highest point of the omnidirectional pattern, and S is a lateral radiation pattern, approximately -60 to -70 dBc. , B is a backward radiation pattern of approximately -60 to -70 dBc or less.

7A is a radiation pattern in the horizontal direction when three service antennas 20-1 to 20-3 having directivity are equally arranged in three directions, and the first antenna 20-1 corresponds to the first antenna 20-1. The first omnidirectional pattern F1 and the second omnidirectional pattern F2 by the second antenna 20-2 and the third omnidirectional pattern F3 by the third antenna 20-3 are synthesized. It can be seen that the entire pattern 72 is relatively large in three directions. FIG. 7C (b) is a radiation pattern in the horizontal direction when four service antennas 20-1 to 20-4 having directivity are equally arranged in four directions, and the first antenna 20-1 corresponds to the first antenna 20-1. The first omnidirectional pattern F1 by the second omnidirectional pattern F2 and the second omnidirectional pattern F2 by the second antenna 20-2, the third omnidirectional pattern F3 by the third antenna 20-3, and the fourth It can be seen that the fourth omnidirectional pattern F4 by the antenna 20-4 is synthesized so that the entire pattern 74 can be serviced in a large area as a whole while being relatively large in four directions.

FIG. 7D is a pattern diagram of the omnidirectional antenna for broadcast service according to the present invention. (A) shows an example in which the radiation beam in the maximum beam direction Fc is omnidirectional as a horizontal radiation pattern A of the omnidirectional service antenna. It is. 7d (b) is a vertical radiation pattern of the omni-directional service antenna, Fc is a pattern in the horizontal and horizontal maximum radiation direction, S is a lateral radiation pattern is an example showing that less than -60 ~ -70 dBc.

As described above, the existing DMB satellite repeater receives the satellite receiving antenna at Ku-band 12 GHz, amplifies and frequency-converts demodulated and decoded the IF, encodes and up-converts it, and then performs high frequency amplification service. In a complicated way. Therefore, in the related art, the stability is decreased by the frequency conversion, the noise is increased, the delay is increased, the configuration is complicated, the price is increased, and the relay quality is deteriorated. The high front and rear ratio alone can be configured to allow the transmit / receive separation to be -140 dBc or more. Therefore, the satellite broadcasting relay system to which the present invention is applied can provide a relay service at low price without interference and low noise without any interference by feedback even in the DMB service of amplifying and copying a reception frequency as it is. In addition, the system of the present invention is not satisfied with the terrestrial service frequency of 2.6 GHz, and can be variously applied to all unidirectional services that receive and amplify and recopy satellite radio waves. In addition, reception and re-radiation polarization can be operated in various ways such as circular polarization and linear polarization.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (6)

A satellite reception antenna for receiving a weak digital multimedia broadcasting (DMB) frequency signal from the satellite; A low noise amplifier for amplifying the received signal of the satellite receiving antenna; A repeater for amplifying and outputting the low noise amplifier with high gain; And a relay service antenna for re-copying the output of the repeater to subscribers in a shadow area. The satellite receiving antenna A cylindrical or square cylindrical reflecting plate having one or more circular openings and a frame when viewed from the front; A wave absorbing dielectric attached to the frame of the reflecting plate, The reflection plate is arranged in a plurality of stages in the horizontal and vertical direction, and is composed of a Yagi-type or patch-type radiating element stacked in multiple stages By reducing the front (radiation direction) of the antenna to increase the front gain and to improve the front and rear side ratio, The relay service antenna A rectangular cylindrical laminated reflector having a frame open at one side as a sphere when viewed from the front, and A wave absorbing dielectric attached to the frame of the reflecting plate, It consists of radiation elements arranged in one or two stages in the vertical direction inside the reflector Satellite broadcasting relay antenna, characterized in that a wide horizontal service is possible. delete delete delete The method of claim 1, wherein the relay service antenna A satellite broadcasting relay antenna, characterized in that a plurality of topographic antennas are uniformly arranged around a support to serve multiple sections. The method of claim 1, wherein the relay service antenna It consists of an omni-directional antenna with a side plate lobe absorbing dielectric plate to absorb radio waves radiated laterally at the upper and lower ends of the vertical axis of the antenna. A satellite broadcasting relay antenna, characterized in that a high total aspect ratio can be obtained.

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