JP2006254399A - Flat antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a patch antenna easy to fabricate in a simple process while a probe line is fixed firmly. <P>SOLUTION: The flat antenna having a waveguide type LNB with an opening of a waveguide on an upper face includes an array type patch antenna unit, in which there is a probe line on a plane of the antenna unit; and a cap jointed with an upper face of the patch antenna unit in accordance with the opening of the LNB waveguide and an upper part of the probe line collecting unit in the patch antenna unit, grounded in connection with a grounding plate of the patch antenna, having an inner cross section which agrees with the opening cross section of the LNB waveguide, and having a height equal to a 1/4 wavelength of antenna receive frequency. As a result, the probe line of the antenna can be mounted firmly, and loss caused by oscillations of the probe line and the like can be reduced, and the array type patch antenna unit can be jointed with LNB without additional work, so a simple process is realized with improved productivity. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a planar antenna for satellite signal reception (PLANAR ANTENNA), and more specifically, the probe line of the antenna can be firmly attached, and the loss due to probe line fluctuation etc. is reduced and processed. By combining an array type patch antenna unit with an LNB (Low Noise blockdown converter) without additional work, the process is simple and productivity is improved. It relates to a planar antenna.

  In general, a signal radiated from a satellite has a frequency band of several GHZ, and its electric flux density is lower than that of a terrestrial radio wave. Therefore, in order to receive this, a parabola that can collect many signals. Antennas have been mainly used.

  However, such a parabolic antenna is bulky and heavy and has few problems for home use, but it is difficult to install in the case of mounting on a vehicle, etc. There was a problem of receiving a lot of air resistance.

  Therefore, in order to solve such problems, a planar antenna has been developed that collects radio waves by arranging a plurality of radiating patches on a plane.

  Furthermore, in order to use the signal of several GHZ band received by the antenna unit receiving the satellite signal in this way for a signal receiving device such as a TV receiver, the frequency is converted to a low frequency band suitable for the received signal. It is necessary to amplify the weak transmission signal. For this purpose, an LNB (Low Noise blockdown converter) of a low noise block down converter is used. Such an LNB is connected to the antenna unit which is the signal receiving unit described above, and constitutes the entire antenna. The configuration is a waveguide (feed horn) for receiving a signal transmitted to the antenna unit and the above-described antenna unit. And a circuit unit for performing signal processing.

  However, as shown in FIG. 1, conventionally, the planar antenna unit and the LNB are connected to each other by bending the probe line of the antenna unit at 90 degrees so as to be perpendicular to the plane of the antenna unit, and guiding the LNB as an input pot. It took the form of three-dimensional insertion into the tube. Although a certain level of signal loss can be reduced through such a configuration, in the case of a line disappearance due to bending of the probe line and a planar antenna, vibration due to movement occurs in consideration of the point that is mainly used for movement. In this case, since the probe line is not firmly fixed, the inserted line cannot swing and cannot be positioned at the center of the waveguide. This causes a problem such as loss and reduces the stability of signal reception. When the antenna unit and the LNB are coupled, there are problems such as poor workability due to additional work.

  The present invention has been made to solve the above-described problems of the prior art, and the processed antenna unit can be coupled to the LNB without additional work, and vibration caused by movement. It is an object of the present invention to provide a planar antenna that does not generate a loss even in the event of occurrence of a fault.

  In order to achieve the above object, the present invention provides a planar antenna including an array type patch antenna unit and a waveguide type LNB coupled to a lower part thereof and having a waveguide opened on an upper surface thereof. An array type patch antenna unit having a probe line on the surface; and an open portion of the LNB waveguide and an upper surface of the patch antenna unit so as to correspond to an upper surface of the patch antenna unit. A cap is connected to the ground plane and grounded, has an inner end face that coincides with the open end face of the waveguide of the LNB, and includes a cap having a height corresponding to a quarter wavelength of the antenna reception frequency.

  According to the planar antenna of the present invention as described above, the LNB and the antenna unit can be directly coupled without additional work such as bending the probe line in the process of coupling the processed antenna unit and the LNB. Since the process is simple and easy to manufacture, there is an advantage that productivity can be improved, and there is an advantage that loss generated at the bent portion due to bending of the probe line can be reduced.

  Furthermore, in the case of a planar antenna, it is often used by being mounted on a vehicle, and in this case, vibration generated by the operation of the vehicle is fundamentally eliminated from probe line vibration that may be caused by being transmitted to the antenna. Therefore, there is an advantage that stable signal reception can be performed even during operation of the vehicle because loss due to antenna vibration does not occur.

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

  The present invention relates to a planar antenna. In the planar antenna including the array type patch antenna unit 10 and a waveguide type LNB 20 that is coupled to the lower part of the array type patch antenna unit 10 and the waveguide 22 is opened on the upper surface, the antenna unit 10 includes: The array type patch antenna unit 10 in which the probe line 12 exists on a plane, and the patch antenna unit 10 so as to correspond to the open part of the LNB waveguide 22 and the upper part of the probe line 12 collecting unit of the patch antenna unit. It is coupled to the upper surface, is connected to the ground plate 16 of the patch antenna unit 10, is grounded, has an inner end surface that coincides with the open end surface of the waveguide of the LNB, and has a height corresponding to a quarter wavelength of the antenna reception frequency. It has the structure containing the cap 1 which has thickness.

  A specific embodiment for this is as shown in FIG. 2, and will be described in detail below with reference to FIG.

  The antenna to which the present invention is applied is a planar antenna having an array type patch antenna unit 10 and is a type of antenna generally called a microstrip antenna. An antenna of this type includes a receiving unit and a modulation / amplification unit, which are divided into an array type patch antenna unit 10 and an LNB unit 20 coupled to the lower part thereof. Further, in order to transmit the signal received from the patch antenna unit 10 to the LNB, a probe line 12 is configured in the patch antenna unit, and a waveguide 22 is configured in the LNB. Although the collected signals are transmitted to the LNB through the waveguide 22, as described in the prior art, the probe line 12 is bent from the antenna portion so as to be three-dimensionally configured so as to be inserted into the waveguide 22. In this case, the probe line 12 is not completely fixed, so that there is a problem sensitive to vibration. Therefore, in order to improve this, the probe line 12 of the patch antenna unit 10 of the present invention is made to exist on the plane of the patch antenna unit 10 without being three-dimensionally bent from the patch antenna unit. This also solves the problem that the probe line 12 vibrates separately from the antenna portion when vibration such as movement occurs.

  However, in the case of having such a configuration, even when the collecting portion of the probe line where the end portions of the probe line 12 are gathered and gathered is placed on the upper portion of the waveguide 22 of the LNB, the signal is transmitted into the waveguide 22. Since the amount of scattering in the air is larger than the amount entering, a large loss occurs. Therefore, the probe line collecting unit is covered with a cap 1 that can prevent this and minimize the loss.

  That is, the cap 1 is for preventing the signal from leaking to the outside, and has a cap shape that has an inner end face that coincides with the open end face of the waveguide 22 of the LNB. A specific example for this is as shown in FIG. Further, since the position has an internal end face such as an open portion of the LNB waveguide 22, it is arranged so as to correspond to this, and in this case, the patch antenna unit is placed inside the cap 1. The probe line 12 collecting unit is included in the projection plane of the cap. Accordingly, the position corresponds to the open portion of the LNB waveguide 22 and the upper portion of the probe line 12 collecting portion of the patch antenna unit 10 and is vertically coupled to the upper surface of the patch antenna unit 10.

  Further, in order to prevent the signal from being extracted, the grounding plate 16 is configured to be connected to the grounding plate 16 so as to be electrically equipotential with the grounding plate 16 of the patch antenna unit 10. To do. This can be configured through various known methods such as a method of connecting a ground line to the cap 1, and preferably a cap as shown in FIG. 2 in order to make the antenna compact. The lower end of the coupler attached to the side surface of 1 is projected below the floor surface of the entire cap 1, and this projecting portion passes through the dielectric substrate 11 and the patch substrate 14 and is connected to the ground plate 16. It can be configured through such a method.

  Furthermore, in order to minimize the loss associated with the introduction of the cap 1, impedance matching must be performed on the cap 1, but in order to implement this, the height of the cap 1 reduces the reflected wave loss. It is preferable to have a height corresponding to a quarter wavelength of the antenna reception frequency that can be minimized, specifically, 0.25 times higher than the wavelength for a 12.2 GHz signal that is the center frequency of the satellite. You can have it. Through this, every time the number of antenna patches increases by a factor of 2, the gain of the antenna increases by about 2.5 dBi, but when the cap is applied, it is close to 3.0 dBi, which is higher than the general gain increase. Gain is obtained.

  Furthermore, the array type patch antenna unit 10 can use various types of patch antenna units including those shown in FIG. 2, and preferably, the array type patch antenna unit 10 with respect to the upper surface and the lower surface is shown in FIGS. As shown in a specific example, a polarization unit 102 is formed on the upper surface, and a plurality of RF radiation patches 112 that extract and transmit a radio signal on the lower surface, a feed line 114 that connects the radiation patches 112, and the As shown in FIG. 2, a plurality of protrusions 17 are formed on the upper surface, and only the protrusions 17 are formed on the lower surface of the dielectric substrate 110. A ground plate 16 made of a conductive material coupled to the dielectric portion and coupled to the dielectric substrate 110 at a predetermined interval and having a waveguide hole 18 corresponding to the waveguide is included. It may have formed. This eliminates the need to insert another dielectric such as a styrofoam between the dielectric substrate 110 and the ground plate 16 and facilitates fabrication, reducing losses caused by non-uniform coupling between the dielectric and the substrate. it can.

  Further, the waveguide 22 in the LNB may have various patterns, and preferably the size of the waveguide is a shape conforming to the WR-75 standard in the form as shown in FIG. It is preferable to have a size in terms of standardization and loss reduction, and the depth of the waveguide is also preferably a height corresponding to a quarter wavelength of the antenna reception frequency for the reason described above. It can have a height of 0.25 times the wavelength with respect to the signal of 12.2 GHz which is the center frequency of the satellite.

  The present invention described above is not limited by the above-described detailed description of the invention and the accompanying drawings, but is within the scope of the spirit and scope of the present invention described in the following claims. It goes without saying that various modifications and changes by those skilled in the art are also included in the scope of the present invention.

Drawing showing coupling relation between probe line and LNB in case of conventional planar antenna The exploded perspective view of one embodiment of the plane antenna of the present invention The bottom view of the LNB cap applied to one embodiment of the planar antenna of the present invention The figure which shows the upper surface of the dielectric substrate applied to one Embodiment of the planar antenna of this invention The figure which shows the lower surface of the dielectric substrate of FIG.

Explanation of symbols

1 LNB cap 10 Array type patch antenna section 11 Dielectric substrate 12 Probe line
13 Radiation Patch 14 Patch Substrate 16 Grounding Plate 17 Separation Protrusion 18 Waveguide Hole 20 LNB (Low Noise Block Daun Converter)
22 Waveguide 102 Polarization part 110 Dielectric substrate 112 Radiation patch 114 Feed line 116 Probe line

Claims (3)

In a planar antenna including an array-type patch antenna unit and a waveguide-type LNB coupled to the lower part of the array-type patch antenna and having a waveguide opened on the upper surface thereof,
An array type patch antenna unit in which a probe line exists on the plane of the antenna unit; and an open part of the LNB waveguide and an upper part of the probe line collecting unit of the patch antenna unit so as to correspond to the upper surface of the patch antenna unit. A cap that is coupled and connected to the ground plate of the patch antenna unit, is grounded, has an inner end face that matches the open end face of the LNB waveguide, and has a height corresponding to a quarter wavelength of the antenna reception frequency. A planar antenna comprising: The array type patch antenna section is
A dielectric having a polarization part formed on the upper surface and a plurality of RF radiation patches for extracting and transmitting a radio signal on the lower surface, a feed line connecting the radiation patches, and a probe line collecting the feed line at one end A plurality of protrusions are formed on the upper surface of the body substrate, and only the protrusions are coupled to the dielectric portion on the lower surface of the dielectric substrate, and are coupled to the dielectric substrate at a predetermined interval, corresponding to the waveguide. 2. The planar antenna according to claim 1, further comprising a ground plate made of a conductive material having a waveguide hole. 2. The planar antenna according to claim 1, wherein the waveguide is a WR-75 standard waveguide and the depth corresponds to a quarter wavelength of the antenna reception frequency.

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