KR100333133B1 - NRD Guide TE Mode Antenna System - Google Patents

Abstract

The present invention proposes an NRD guide TE mode antenna system having a TE mode using an NRD guide. Common mode types of propagation transmitted through the NRD guide are LSE and LSM modes. The main one used for NRD guides here is LSM mode. Therefore, the LSM mode is converted to the TE mode to radiate radio waves through a conventional rod antenna.

Description

NDR Guide TE Mode Antenna System {NRD Guide TE Mode Antenna System}

Non-radial dielectric waveguides have a distance between the conductive parallel plates less than half the frequency of the used frequency, and a dielectric strip is inserted therebetween, and electromagnetic waves are transmitted (waves) along the dielectric strip. .

Non-radioactive dielectric waveguides (hereinafter referred to as "NRD guides") have low transmission loss compared to microstrip lines due to the high non-radiation of radio waves propagating into the dielectric, and are simpler to manufacture and configure circuits than waveguides. It is attracting attention as a transmission line in the wave band.

As technology in the millimeter wave band using NRD guides gradually spreads, interest in antennas as well as NRD guide circuits is amplified.

The present invention proposes an NRD guide TE mode antenna system having a TE mode using an NRD guide. Common mode types of propagation transmitted through the NRD guide are LSE and LSM modes. The main one used for NRD guides here is LSM mode. Therefore, the LSM mode is converted to the TE mode to radiate radio waves through a conventional rod antenna.

Embodiment 1 of the NRD guide TE mode antenna system includes a Teflon block (301, 302, 303, 304), a TE mode compressor (401), a mode converter (501), and a vertical LSM mode suppressor (601) between the upper and lower conductor plates (101,201). The rod antenna 701 is attached to a portion deviating from the upper and lower conductor plates 101 and 201.

Embodiment 2 of the NRD guide TE mode antenna system includes a Teflon block (301, 302, 303), a TE mode compressor (401), a mode converter (501), a horizontal LSM mode suppressor (602) between the upper and lower conductor plates (101, 201). The rod antenna 701 is attached to a portion deviating from the upper and lower conductor plates 101 and 201.

1: NRD Guide TE Mode Antenna System Block Diagram.

2 is a perspective view of an NRD guide TE mode antenna system of Example 1. FIG.

3 is a perspective view separately showing respective parts of the NRD guide TE mode antenna system of Embodiment 1. FIG.

4 is a perspective view of a TE mode sprayer system used in Examples 1 and 2. FIG.

5 is a perspective view of the mode converter used in Examples 1 and 2. FIG.

6 is a perspective view of a vertical LSM mode compressor used in Example 1. FIG.

7 is an operating principle of the system of the NRD guide TE mode antenna of Embodiment 1. FIG.

8 is a perspective view of an NRD guide TE mode antenna system of Example 2. FIG.

9 is a perspective view separately showing respective parts of the NRD guide TE mode antenna system of Example 2. FIG.

10: Perspective perspective view of the horizontal LSM mode sprayer used in Example 2. FIG.

11 is an operating principle of the NRD guide TE mode antenna system of Embodiment 2. FIG.

12: E-plane radiation pattern diagrams of the NRD guide TE mode antenna system of Examples 1 and 2. FIG.

13: H-plane radiation pattern diagram of the NRD guide TE mode antenna system of Examples 1 and 2. FIG.

[Description of the symbols for the main parts in the drawing]

101, 201: upper and lower conductor plates

301, 302, 303, 304: dielectric strip block

401: TE Mode Suppressor

501: Mode Converter

601: Vertical LSM Mode Suppressor

602: Horizontal LSM Mode Suppressor

701: rod antenna

The present invention implements a new antenna system by attaching a rod antenna used in the existing NRD guide circuit and system by converting the LSM mode, which is mainly used among the LSE and LSM modes of the NRD guide, to the TE mode.

1 is a block diagram of a new type NRD guide TE mode antenna system to be implemented in the present invention. First, the millimeter wave of the LSM mode is transmitted through the first Teflon block 301, and is passed through the TE mode sprayer 401 to the second Teflon block 302.

At this time, the TE mode compressor 401 serves to allow only the pure LSM mode to pass through the first Teflon block 301, but above all, the mode converter 501 passes the mode conversion through the second Teflon block 302. It is the most important role of the TE mode sprayer 401 to prevent various modes and undesired waves from being returned to the input terminal.

Passing the second block 302 and passing the mode converter 501 converts the LSM mode to TE mode. The converted millimeter wave passes through the third Teflon block 303 to reach the LSM mode compressors 601 and 602.

In fact, not only the TE mode but also the LSM mode and other modes may occur because the LSM mode is not completely converted to the TE mode through the mode converter 501. The unnecessary mode and the LSM mode thus generated are mostly suppressed and extinguished through the LSM mode compressors 601 and 602.

The TE mode generated through the mode conversion is radiated to the outside through the load antenna 701.

Example 1

2 is a perspective view of Embodiment 1 proposed in the present invention. The NRD guide circuit includes a Teflon block 301, a TE mode compressor 401, a Teflon block 302, a mode converter 501, a Teflon block 303, a vertical LSM mode compressor 601, a Teflon block ( It is coupled in the order of 304 is placed between the parallel upper and lower conductor plates (101,201). Through this NRD guide circuit, the LSM mode, which is the main mode of the NRD guide, is converted to the TE mode.

The converted TE mode millimeter wave is transmitted to the load antenna 701 and radiated. The rod antenna 701 is a material having the same characteristics as the Teflon blocks used in the NRD guide circuit, and gradually reduces the width of the Teflon block to serve as an antenna capable of radiating radio waves. In the present invention, since the system for the 60 GHz band is to be implemented, the heights of the upper and lower conductor plates 101 and 201 and the heights of the Teflon blocks and all the components are 2.25 mm, and the width is 2.5 mm except for the antenna. At the interface between the TE mode output terminal and the rod antenna of the NRD guide circuit, the NRD guide circuit has the same width as that of the Teflon block but gradually decreases in width to reach the end point. The best was 40mm.

Figure 3 shows the parts separately for Example 1 of the present invention. Teflon blocks with the same medium should be sized differently depending on where they are inserted. The first teflon block 301 is an input terminal into which the millimeter wave of the LSM mode is incident, and the fourth teflon block 304 is a terminal from which the LSM mode is converted to the TE mode through the NRD guide conversion circuit and the millimeter wave is output. This output terminal is coupled with the load antenna 701. Therefore, since the lengths of the first and fourth Teflon blocks 301 and 304 are not important, the lengths of the second and third Teflon blocks 302 and 303 will be described.

The second Teflon block 302 is inserted between the TE mode compressor 401 and the mode converter 501. In this part, the LSM mode is passed through the TE mode compressor 401 and the mode converter 501 converts the LSM mode to the TE mode. However, in this conversion, the millimeter wave in TE mode is not reflected to the next stage but is slightly reflected and returned to the input terminal. The reflected millimeter wave in TE mode will be blocked from returning to the input terminal by the TE mode sprayer 401, but in addition to this, the length of the Teflon block is set to 1 of the wavelength for the TE mode to cancel the TE mode. It can be offset to some extent by giving / 4.

The third Teflon block 303 is inserted between the mode converter 501 and the vertical LSM mode compressor 601. In this portion, the millimeter wave of the TE mode and the millimeter wave of the weak LSM mode are introduced through the mode converter 501. Accordingly, the vertical LSM mode compressor 601 is inserted to suppress the millimeter wave of the LSM mode from the combined millimeter wave and to transmit only the millimeter wave of the TE mode to the antenna. However, although the LSM mode may be canceled in the vertical LSM mode compressor 601, there will be a millimeter wave of the LSM mode reflected and returned to the mode converter 501. Therefore, in order to cancel the millimeter wave of the LSM mode, the length of the Teflon block 303 inserted between the mode converter 501 and the vertical LSM mode compressor 601 is given as 1/4 of the wavelength for the LSM mode. This can be offset to some extent.

4 is a perspective view of the TE mode sprayer 401. The TE mode sprayer 401 has a metal pattern in which metal strips formed perpendicular to the upper and lower conductive plates 101 and 201 parallel to the upper and lower conductive plates 101 and 201 are disposed on the dielectric substrate. The dielectric substrate has a dielectric constant of 2.56 and a thickness of 0.3 mm. This dielectric substrate is also used in the mode converter 501, the vertical LSM mode presser 601, and the horizontal LSM mode presser 602 of the second embodiment.

In the present invention, the TE mode compressor 401 is designed for a millimeter wave of 60 GHz. The width of the metal strips is 0.05 mm and the spacing between them is 0.15 mm. And, the distance that they are separated from the edge of the dielectric is 0.1mm up and down. That is, the length of the strip is 2.05 mm.

5 is a perspective view of the mode converter 501. The dielectric substrate for the mode conversion is configured by diagonally disposing a metal pattern having the form of "a" and "b". The width of the metal pattern is 0.2 mm and the width of the bent strip is 0.1 mm. In addition, the spacing between the bent strips of the two metal patterns is 0.1 mm. For the size and shape of these metal patterns, reference was made to the reference "Domestic Patent Application No. 10-2001-008327".

6 is a perspective view of a vertical LSM mode compressor 601. The LSM mode appears almost parallel to the upper and lower conductor plates 101 and 201 having parallel electric fields. Therefore, in order to block this mode, as shown in FIG. 6, the metal strips should be formed in parallel with the upper and lower conductor plates 101 and 201 and arranged vertically. At this time, the width of the metal strips is 0.05 mm, the length is 2.3 mm, and the spacing between these metal strips is 0.15 mm.

7 shows a block diagram of Embodiment 1 of the present invention and a millimeter wave propagation process having respective modes in each region.

First, the LSM mode millimeter wave is input through the first Teflon block 301. If the input millimeter wave includes the TE mode in addition to the LSM mode, it will be blocked by the TE mode compressor 401. The input millimeter wave passes the TE mode sprayer 401 to the mode converter 501 and is mostly converted to the TE mode and transferred to the third teflo block 303. However, the untransmitted reflected TE mode millimeter wave cancels the TE mode in the second Teflon block 302 having a length corresponding to one quarter of the wavelength with respect to the TE mode frequency, and is also caused by the TE mode sprayer 401. Incidents on the input terminals will be blocked.

Subsequently, the millimeter wave traveling through the mode converter 501 is mostly in TE mode, but will contain a millimeter wave in a weak LSM mode. Thus, the vertical LSM mode compressor 601 is inserted to block this LSM mode. However, there is a millimeter wave of the LSM mode reflected by the vertical LSM mode compressor 601. The millimeter wave of this LSM mode will cancel the LSM mode in the third Teflon block 303 having a length corresponding to one quarter of the wavelength with respect to the LSM mode frequency.

Through this process, the millimeter wave of the TE mode is transmitted to the load antenna 701.

Example 2

8 is a perspective view of Embodiment 2 proposed in the present invention. The NRD guide circuit is combined in the order of the Teflon block 301, the TE mode sprayer 401, the Teflon block 302, the mode converter 501, the Teflon block 303, and the horizontal LSM mode compressor 602. It is placed between the parallel upper and lower conductor plates (101,201). Through this NRD guide circuit, the LSM mode, which is the main mode of the NRD guide, is converted to the TE mode.

The millimeter wave of the TE mode thus converted is transmitted to the load antenna and radiated.

Figure 9 shows separately the parts for Example 2 of the present invention. Teflon blocks with the same medium should be sized differently depending on the positions of the blocks to be inserted. The first teflon block 301 is an input terminal into which the millimeter wave of the LSM mode is incident, and the fourth teflon block 304 is a terminal from which the LSM mode is converted to the TE mode through the NRD guide conversion circuit and the millimeter wave is output. This output terminal is coupled with the load antenna 701.

The system is configured as in the first embodiment, except that the vertical LSM mode compressor 601 in the first embodiment is replaced with the horizontal LSM mode compressor 602, and the fourth Teflon block 304 is removed. This can be achieved by Therefore, the detailed description of Embodiment 2 of the present invention will be described for the horizontal LSM mode compressor 602 and the overall operation principle.

10 is a perspective view of a horizontal LSM mode sprayer 602. The LSM mode appears almost parallel to the upper and lower conductor plates 101 and 201 having parallel electric fields. Therefore, in order to block this mode, a metal plate is inserted in the center of the dielectric strip, ie, the Teflon block, in parallel with the upper and lower conductor plates 101 and 201 as shown in FIG. At this time, the thickness of the metal plate is 0.0175mm, the width is 2.1mm, the length is 2.4mm.

11 shows a block diagram of Embodiment 2 of the present invention and a millimeter wave propagation process having respective modes in each region. First, the LSM mode millimeter wave is input through the first Teflon block 301. If the input millimeter wave includes the TE mode in addition to the LSM mode, it will be blocked by the TE mode compressor 401. The input millimeter wave passes the TE mode sprayer 401 to the mode converter 501 and is mostly converted to the TE mode and transferred to the third Teflon block 303. However, untransmitted and reflected TE mode millimeter waves cancel the TE mode in the second Teflon block 302 having a length corresponding to one quarter of the wavelength with respect to the TE mode frequency, and also by the TE mode sprayer 401. Incidents on the input terminals will be blocked.

Subsequently, the millimeter wave traveling through the mode converter 501 is mostly in TE mode, but will contain a millimeter wave in a weak LSM mode. Thus, a horizontal LSM mode compressor 602 is inserted to block this LSM mode. However, there is a millimeter wave of the LSM mode reflected by the horizontal LSM mode compressor 602. The millimeter wave of this LSM mode will cancel the LSM mode in the third Teflon block 303 having a length corresponding to one quarter of the wavelength with respect to the LSM mode frequency.

Through this process, the millimeter wave of the TE mode is transmitted to the load antenna 701.

12 and 13 illustrate radiation patterns of E and H planes of the NRD guide TE mode antenna system implemented through the embodiment. From these results, it can be seen that the antenna gain is 16.5 dB, and a beam is formed in the direction in which the rod antenna 701 is disposed (the direction in which radio waves travel, the direction where φ is 0 ° and θ is 90 °). At this time, the HPBW (Half Power Beam Width) is about 10 degrees.

In the present invention, the NRD guide TE mode antenna system can replace the NRD guide antenna implemented using the NRD guide with an antenna that can be used in microwave bands such as Microstrip and Waveguide, and also the production cost is reduced because the production is simple. The increased productivity by reducing the production process will result in an antenna system that can be widely used in the millimeter wave band.

Claims (2)

Between the parallel upper and lower conductor plates 101 and 201 Place the first Teflon block 301 into which the millimeter wave of the LSM mode is incident, A TE mode compressor 401 is arranged to block the remaining TE mode at the input and the TE mode reflected by the mode converter 501, In order to cancel the TE mode reflected by the mode converter 501, a second Teflon block 302 having a length of 1/4 of the wavelength of the millimeter wave of the TE mode is disposed, A mode converter 501 capable of converting the LSM mode to the TE mode, In order to cancel the LSM mode reflected by the vertical LSM mode compressor 601, a third Teflon block 303 having a length corresponding to a quarter of the wavelength of the millimeter wave of the LSM mode is disposed, Place a vertical LSM mode compressor 601 mounted to block the residual LSM mode contained in the millimeter wave converted and transmitted through the mode converter 501, Place a fourth Teflon block 304 to connect the vertical LSM mode compressor 601 and the load antenna 701, Out of the parallel upper and lower conductor plates 101 and 201 Load antenna 701 to radiate the millimeter wave of the TE mode, An NRD guided TE mode antenna system characterized by obtaining a desired antenna gain and having good radiation characteristics. Between the parallel upper and lower conductor plates 101 and 201 Place the first Teflon block 301 into which the millimeter wave of the LSM mode is incident, Place a TE mode compressor 401 to block the remaining TE mode at the input and the TE mode reflected from the mode converter 501, In order to cancel the TE mode reflected by the mode converter 501, a second Teflon block 302 having a length of 1/4 of the wavelength of the millimeter wave of the TE mode is disposed, A mode converter 501 capable of converting the LSM mode to the TE mode, In order to cancel the LSM mode reflected by the horizontal LSM mode compressor 602, a third Teflon block 303 having a length corresponding to a quarter of the wavelength of the millimeter wave of the LSM mode is disposed, Place a horizontal LSM mode compressor 602 mounted to block the residual LSM mode contained in the millimeter wave transmitted through the mode converter 501, Out of the parallel upper and lower conductor plates 101 and 201 Load antenna 701 to radiate the millimeter wave of the TE mode, An NRD guided TE mode antenna system characterized by obtaining a desired antenna gain and having good radiation characteristics.