KR20020059991A - Slit-groove leaky wave antenna - Google Patents

Abstract

PURPOSE: A flat-plate groove leakage wave antenna is provided to reduce the size of an antenna by forming a slit-groove shaped waveguide. CONSTITUTION: A feeding unit(201) is comprised of a waveguide having an inner wall of a parabola shape. A radiating unit(203) is comprised of a waveguide having plural slits(205) and a trench structure. The waveguide is made of duralumin. A width of each of the slit and the trench is 10 λ. The feeding unit(201) is a hog horn shape in order to feed a feeding wave. The feeding unit(201) is coupled to an input terminal of the radiating unit(203). An inner portion of the feeding unit(201) has a parabola shape, for transferring an electromagnetic wave to the input terminal of the radiating unit(203) in phase. Power radiated from the respective slits(205) are coupled to each other to form a beam.

Description

Flat groove leaky wave antenna {SLIT-GROOVE LEAKY WAVE ANTENNA}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a planar groove type leaky wave antenna, and more particularly, to a leaky waveguide slot array antenna capable of easily receiving radio waves for satellite broadcasting in a moving object.

Recently, many researches on antenna design for Direct Broadcast from Satellite (DBS) have been conducted in various forms. High-gain, narrow-beamwidth and good beam-scanning characteristics Aim to have. In addition, it is required to reduce the size of the antenna without causing a decrease in function due to spatial limitations, and various characteristics for mounting the mobile body are required.

However, conventional parabolic antennas for satellites are difficult to miniaturize and lighten in manufacturing, and have low mobility. Type slot antennas are disclosed in the prior art.

1 is a configuration diagram of a conventional leaky waveguide waveguide slot array antenna, and as shown in the drawing, radiation waveguides 1A, 1B, 1C, ..., 1L arranged in parallel and adjacent to each other, and each of these radiation waveguides It consists of a feed waveguide 2 which synthesizes the received radio wave and supplies it to a converter. On the upper surface of the radiation waveguides 1A to 1L, a plurality of cross slots 4 are formed along the tube axis direction. The feed waveguide 2 has a structure in which a waveguide [pi] branch branch is provided with a plurality of posts and is connected at the same time, and both ends are short-circuited. The light wall width of the feed waveguide 2 has a structure in which the wavelength inside the tube is coupled so as to be twice the light wall width of the radiation waveguides 1A to 1L, and the coupling windows 7 of each Π branch are connected to two adjacent radiation waveguides. It has a structure that is coupled to be in phase with respect to. In addition, the inductive posts 6 are coupled to each Π branch. The inductive post 6 suppresses the reflection of radio waves in the coupling window 7 of the corresponding π branch to perform traveling wave excitation to the corresponding feeding waveguide, and simultaneously feeds the waveguide by electromagnetic coupling of the coupling window 7. This suppresses the shortening of the wavelength in the tube. Therefore, the structure is composed of a plurality of radiation waveguides arranged adjacent to each other while the plurality of slots are arranged at the same time to match the propagation direction of the wave, and rotates along the axis of rotation to follow the wave in the azimuthal direction You can track it.

However, this prior art requires that the shape of all slots on the radiation waveguide must be different depending on the position, and when the separation window separating each radiation waveguide, the bifurcation coupling window, the inductive post, and the feed probe are manufactured on the plate. There is a problem that the manufacturing process is difficult, such as the assembly process is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object thereof is to provide a flat groove type leaky wave antenna for mounting a moving object.

1 is a configuration diagram of a conventional leaky waveguide waveguide slot array antenna;

2 is a structural diagram of an embodiment of a planar groove type leaky wave antenna according to the present invention;

3 is a structural diagram of a radiator of FIG. 2;

4 is a cross-sectional view taken along the line a-a in FIG.

5 is a structural diagram of a power supply unit of FIG. 2.

* Explanation of symbols for main parts of the drawings

201: power supply unit 203: radiation unit

205: Slit 403: Groove

In order to achieve the above object, the present invention provides a flat plate groove type in a satellite leak wave antenna including a feeder composed of a waveguide having a parabolic treatment of an inner wall to feed a plane wave to a radiating portion, and a radiator composed of a waveguide having a slit and groove structure. Provide a leaky wave antenna.

Here, the waveguide is preferably made of duranium.

In addition, the slits and grooves have a width of 10 Is preferably.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a structural diagram of an embodiment of a flat groove leakage wave antenna according to the present invention. As shown in the drawing, the antenna according to the present invention has a structure in which the feeder 201 and the radiator 203 are combined, and a plurality of rectangular slits 205 are formed on the top of the radiator 203.

FIG. 3 is a structural diagram of the radiating part of FIG. 2, and FIG. 4 is a cross-sectional view taken along the aa direction of FIG. 2, and the radiating part 203 has a plurality of grooves 403 formed at positions corresponding to the respective slits 205 on a lower surface thereof. The waveguide structure is formed.

The magnetic field in the region (a) is expressed as

here,

ego,

to be.

The magnetic field of the incident wave and the scattered wave in the region (b)

And

Expressed as

ego,

,

And

to be.

In addition, the total transmitted wave magnetic field in the region (C)

Expressed as

And

to be.

Finally, the total magnetic field in the zone d is

,

And

It is expressed as here

,

And

to be.

On the other hand, the incident, reflected, transmitted, and radiated power when the incident wave is radiated through the slit in the parallel waveguide are respectively

,

,

And

Where radiated power into the air is

And

It is expressed as

The material of the radiating part 205 and the power feeding part 203 used duranium. In this embodiment of the antenna according to the present invention, the width of the slit and the depth of the groove are set to 12 GHz as the center frequency and arranged to have circular polarization. The length of the slit and the groove in the horizontal direction is approximated in two dimensions so that it is long enough for the wavelength. Determined. As the number N of slits increases, the ratio of radiant power increases, but as the number increases, the size of the antenna increases, so the number of slits N is limited to 20.

FIG. 5 is a structural diagram of the feeder of FIG. 2. As shown in the drawing, the feeder 201 is configured in the form of a hog horn to feed a plane wave and is coupled to an input terminal of the radiator 203. . In other words, one side of the feeder 201 is parabolic in order for the input power to be excited so that electromagnetic waves are incident to the input end of the feeder 201 and transmitted to the input end of the radiator 203 while maintaining the same phase. It is formed in the form of. Therefore, the power radiated from each slit 205 may be combined with each other to form a beam and receive a desired received signal.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, by implementing the waveguide of the slit-groove, the leakage that can receive a variety of services to be provided through the satellite while moving the moving object without having to manufacture a number of different slits respectively There is an effect that can implement a wave antenna. That is, it is possible to receive satellite broadcasting in a desired place by mounting it on a moving object such as a vehicle, a ship, and a train.

In addition, the present invention has the effect that can be used as a substitute for a large antenna, such as a parabolic antenna by implementing the antenna for satellite broadcast reception through the design for the reduction in weight, weight.

Claims (3)

In the satellite leak wave antenna, A feeding part composed of a waveguide having an inner wall formed in a parabolic shape; And Radiating part consisting of a waveguide having a plurality of slits and groove structures Flat groove type leaky wave antenna comprising a. The method of claim 1, The waveguide is, Flat groove type leaky wave antenna, characterized in that made of duranium. The method of claim 1, The slit and groove, Its width is 10 Flat groove type leaky wave antenna, characterized in that.