KR100702774B1 - Dual feeding dual resonance antenna structure - Google Patents

Abstract

The present invention relates to an antenna structure of a double-feed dual resonance type, using a microstrip patch that is easy to manufacture in a compact, lightweight, and thin, and used a rectangular patch as a radiating element to implement dual resonance with a single antenna, It is designed so that the double resonance and the polarization generated at each resonance point are perpendicular to each other by giving feeds perpendicular to the length and width of the patch antenna, and the feeding structure is operated at the up-down frequency by mixing the microstrip feed and the aperture coupling feed. It was made. Therefore, the antenna according to the present invention can be utilized for various mobile services, and it is possible to implement transmission and reception of voice, data, and video by simply installing the antenna in a desired place.

Description

Structure of double-fed Dual Resonance microstrip patch antenna

1 is a block diagram of a double feed double resonant antenna according to the present invention.

Figure 2 is a structure of a microstrip feeding discharge device according to the present invention.

Figure 3 is a structure of the opening surface coupled feed radiating element according to the present invention.

<Description of Symbols for Main Parts of Drawings>

       11: radiating element 12: microstrip feeder

       13 conductor plate 14 opening surface feeder

       15: first dielectric 16: second dielectric

       17: air layer 18: opening surface

The present invention relates to an antenna for satellite communication, and more particularly, a dual feed dual resonant antenna structure that enables transmission and reception by implementing different orthogonal linear polarizations using a microstrip feed and an aperture coupled feed on a square patch. It is about.                         

Satellite communication technology has made rapid progress in a relatively short time, and in recent years, with the advent of satellites equipped with advanced devices such as multi-beam antennas, high power amplifiers, and OBPs, the range of services through satellites has been further increased. The high output of the satellite enables the miniaturization, light weight, and mobility of the base station antenna. Through this, the form of the satellite communication service also provides various multi-directional multimedia services with added mobility beyond the simple fixed data relay service provided by the existing satellite. It is trying to develop in the direction of doing so. As a result, satellite parabolic antennas, which are generally used, have difficulty in miniaturizing, reducing weight, and have low mobility. Recently, antennas having a small volume and high mobility have been introduced to implement mobile services through satellites. have.

In addition, in order to implement a single antenna for transmitting and receiving, a technique for generating a double resonance with a single antenna is required. Looking at the related design techniques, a method of using a diachronic radiating element and a radiating plate for transmitting and receiving in a multilayered structure Method, a method of realizing a double radiating to a single radiating element has been studied.

The present invention proposes a planar antenna design having a small size, light weight, and high mobility, instead of the conventional parabolic antenna for realizing a mobile service using a geostationary satellite, and transmits a single antenna to minimize the size of the antenna. The purpose of the present invention is to provide a dual-feed dual resonant antenna structure that can serve as both a reception and a reception and can be easily expanded according to the arrangement.

The present invention for achieving the above object

A first dielectric 15 coupled to the radiating element 11 of the rectangular patch and having a microstrip feed line 12 on one side of the radiating element 11 to perform micro strip feeding;

An air layer 17 formed below the first dielectric 15 to increase a use frequency bandwidth; And

A conductor plate (13) formed below the air layer (17) in parallel with the microstrip feed line (12) and including an opening surface (18) therein; And

And a second dielectric 16 formed below the conductor plate 13 and having an opening coupling surface feed line 14 positioned on a lower surface thereof to perform aperture coupling feeding. The opening surface 18 is installed to be orthogonal to implement orthogonal linear polarization.

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

First, terms used in the present invention are defined as follows.

Double resonance means the elimination of reactance at two frequencies.

The dielectric is a material used as an electrical insulator and defines the material of the antenna substrate used in the present invention.

Aperture coupled feeding is one of the methods of feeding a radiating element, which means that an opening is located between the radiating element and the feed line, and the feeding is performed by an electrical coupling between the feeder and the radiating element through the opening. The opening feeding method is technically easy to control the feeding impedance by controlling the size of the opening and the thickness of the dielectric, and isolates the radiating surface and the feeding surface to reduce the radiation area and reduce the radiation loss by the feed line, resulting in high efficiency. To implement the antenna.

The microstrip feeding refers to a method of feeding by placing a feed line on one side of the radiating element.

Circular polarization refers to the polarity of propagation in which the trajectory of the tip of the vector representing the magnitude and direction of the electric field in a plane perpendicular to the propagation direction of the propagation circled.

Linear polarization refers to the polarity of radio waves in which the end trajectory of the vector representing the magnitude and direction of the electric field is perpendicular or horizontal in the plane perpendicular to the propagation direction of the radio wave.

Double polarization means that vertical and horizontal polarizations occur simultaneously in the case of linear polarization.

1 illustrates an antenna for double feeding and double resonance applied to the present invention. The radiating element 11, the first dielectric 15, the air layer 17, the conductor plate 13, and the second dielectric 16 are shown in FIG. Are stacked one by one.

The radiating element 11 is placed in the shape of a rectangular patch on the upper surface of the first dielectric 15 to convert the electromagnetic field energy transmitted through the feed lines 12 and 14 into the electromagnetic field energy propagated in the air.

In addition, an air layer 17 having a dielectric constant of 1 was inserted between the first dielectric 15 and the conductor plate 13 to expand the bandwidth. Herein, when the air layer 17 is inserted into the two dielectrics 15 and 16, the change of the resonance frequency is expressed as follows.                     

<Equation 1>

은 공기층을 삽입하지 않았을 때의 공진주파수이고,

는 실효 유전율이다. here

Is the resonant frequency when no air layer is inserted,

Is the effective permittivity.

At this time, the effective dielectric constant can be obtained by the following equation.

Where t is the thickness of the dielectric and Δ is the thickness of the air layer.

Therefore, in Equation 1, the addition of the air layer increases the use bandwidth because the effect of lowering the relative dielectric constant of the first dielectric material and increasing the thickness thereof.

A rectangular opening surface 18 is located on the conductor plate 13 and through the opening surface coupling feed line 14 located on the bottom surface of the second dielectric 16 through the opening surface 18 with the radiating element 11. Allow electrical feeding to occur.

That is, the microstrip feed and the aperture coupling feed are separated into upper and lower layers based on the conductor plate 13 to maintain a high degree of separation between the two feeds.

The radiating element 11 is sized such that double resonance occurs at each particular frequency. That is, the resonant frequency due to the microstrip feeding is determined by the length of the y-axis direction of the radiating element 11 which is not in contact with the microstrip feed line 12, and the resonant frequency of the radiating element 11 is determined by the length of the radiating element 11. This determines the resonant frequency due to aperture coupling feeding.                     

In addition, when the feed is perpendicular to each other in the length and width of the patch antenna, the double resonance occurs through a single radiating element 11, the polarization generated at the resonance point is designed to be perpendicular to each other feed line (12, 14) The current induced through the is made to be vertical. That is, the current induced in the microstrip feed line 12 is induced into the radiating element 11 through the microstrip feed line 12 in the y-axis direction directly contacting the radiating element 11, and formed in the second dielectric 16. The primary induced current is generated through the opening surface 18 in the y direction formed in the conductor plate 13, and the current induced through the opening surface coupling feed line 14 in the x direction is generated through the radiating element 11. A differential induced current is generated, which is a polarization perpendicular to the microstrip feeding.

In addition, compared with the microstrip feeding method, the aperture coupling feeding method has the effect of lowering the resonant frequency when considering the radiating element 11 of the same size, and thus the microstrip constituting the feeding network on the upper surface of the first dielectric 15. The feeding method is designed to operate at an uplink frequency (14.25 GHz), and the aperture coupling feeding system constituting a feeding network on the lower surface of the second dielectric 16 is operated at a downlink frequency (12.5 GHz).

2 and 3 illustrate the structure according to the microstrip feeding and the opening surface coupling feeding according to the present invention, respectively.

Herein, the radiating element 11 has a size of 8.39mm × 7.63mm (X × Y) to enable double resonance, and the dielectric constant and thickness of the first dielectric 15 are 2.2 and 20mil, respectively. The dielectric constant and thickness of the air layer 17 are 1 and 0.5 mm, and the dielectric constant and thickness of the second dielectric 16 are 6.5 and 25 mil.                     

The opening surface 18 is 0.24mm × 5.34mm (SD × SL), and the microstrip feed line 12 has a size of 0.4065mm × 0.34mm (H × D1), and the opening surface feed line 120 Is 1.95 mm x 0.1822 mm (FL x FD).

As described in detail above, the present invention has an effect of increasing convenience by implementing a mobile service by presenting a structure of a flat type transmission / reception antenna having excellent miniaturization, light weight, and mobility instead of the conventional satellite parabolic antenna.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (12)

A first dielectric 15 coupled to the radiating element 11 of the rectangular patch and having a microstrip feed line 12 on one side of the radiating element 11 to perform micro strip feeding; An air layer 17 formed below the first dielectric 15 to increase a use frequency bandwidth; A conductor plate (13) formed below the air layer (17) in parallel with the microstrip feed line (12) and including an opening surface (18) therein; And A second dielectric 16 formed below the conductor plate 13 and having an opening coupling surface feed line 14 formed at a lower surface thereof to perform opening feeding; The double feed double resonant antenna structure is characterized in that the orthogonal linear polarization is installed by orthogonal to the aperture coupling feed line (14) and the aperture (18). The method of claim 1, The radiating element (11) is a double-feed double resonant antenna structure characterized in that the vertical feeding on the length and width of each of the two to generate a double resonance, the mutually perpendicular polarization is generated at the resonance point. The method of claim 1, The radiating element 11 has a double feed double resonant antenna structure, characterized in that the size is 8.39mm × 7.63mm (X × Y) to enable double resonance. The method of claim 1, The air layer (17) has a dielectric constant of 1, the thickness of the double-feed dual resonant antenna structure, characterized in that 0.5mm. The method of claim 1, The dielectric constant of the first dielectric (15) is 2.2, the thickness of the double-feed dual resonance antenna structure, characterized in that 20mil. The method of claim 1, The dielectric constant of the second dielectric (16) is 6.15, the thickness of the double-feed double resonant antenna structure, characterized in that 25mil. The method of claim 1, The aperture surface (18) is a double feed double resonant antenna structure, characterized in that the size of 0.24mm x 5.34mm (x x y). The method of claim 1, The microstrip feed line (12) is a dual-feed dual resonant antenna structure, characterized in that the size of 0.4065mm × 0.34mm (x × y). The method of claim 1, The aperture feed line 14 has a size of 1.95mm x 0.1822mm (x x y) of the double feed double resonant antenna structure. The method of claim 1, The opening face 18 and the opening face feed line 14 are formed to be perpendicular to each other, and the opening face feeding line 14 and the radiating element 11 are electrically coupled to each other through the opening face 18. A double feed dual resonance antenna structure. The method according to claim 1 and 5, The first dielectric (15) is a double feed dual resonance antenna structure, characterized in that the resonance occurs in the transmission band center frequency of 14.25GHz. The method according to claim 1 and 6, The second dielectric (16) is a double feed dual resonance antenna structure, characterized in that the resonance occurs in the center frequency of the reception band 12.5GHz.

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