JPS6356004A - Plane antenna - Google Patents

Abstract

PURPOSE:To obtain a plane antenna with a high overall efficiency by separating a radiation section and a feeding system completely so as to design them most efficiently. CONSTITUTION:Dielectric layers 4a-4d are formed by air layers and the interval between both earth conductors 3a, 3b and conductors 5, 6a, 6b is kept to a prescribed distance respectively by a supporting rod 8. Moreover, an earth conductor 3a is provided with a through hole 9 to which connection conductors 7a, 7b are inserted. Since the radiation section 1 and the feeding system 2 are formed completely separately, they are designed most efficiently and the plane antenna with a high overall efficiency is obtained. Since two kinds of feeding points of the radiation conductor 5 are energized by a couple of the feeding conductors 6a, 6b, the plane antenna receiving various polarized waves is easily realized by switching the feeding system.

Description

[Detailed description of the invention] [Technical part Ii! ? ] The present invention is a system for receiving R and J star broadcasts transmitted from broadcasting satellites.
The invention relates to a planar antenna.

[Back weight technology] , 2 near, 236,000 K In on the equator +7J 'stop'
Satellite broadcasting using the F band (12 (iHz band)) by yh FD- has been put into practical use, and parabolic antennas are commonly used as antennas for receiving radio waves transmitted from broadcasting satellites in each home. A certain force C5 The antenna shape R and the structure of the mounting part are complicated and require great strength, so there is a problem of high cost.Therefore, in order to solve the above problems of the parabolic antenna,
Planar antennas are attracting attention because they have a simple shape, can be easily attached to walls or roofs, and are easy to maintain. By the way, as a planar antenna for this scale, for example, as shown in Figs. The radiation conductor 5 consisting of a line and λ[? /4) Consists of a microstrip line equipped with a 7-ohm lance. There was one in which a power supply conductor 6 was formed. However, in this way, the radiation conductor 5 and the power supply water conductor 6 are formed on the same plane! , λ, in the conventional example, the radiation part 1 for the purpose of radiation and the feed system 2 for the purpose of reducing radiation loss are formed in the same groove configuration.
・Since it is, one of the efficiency (for example, the radiation efficiency of the radiation part 1)
If emphasis is placed on , there is a dilemma that the efficiency of the pond power (for example, the feeding efficiency of feeding system 2) will deteriorate, and the overall efficiency of the planar antenna cannot be improved.
In the conventional example described above, when emphasis was placed on the efficiency of the radiation B1, the equivalent feed system loss was approximately several dB/m. In addition, in the figure, the x mark indicates the feeding point, point A is the extraction point for left-handed circularly polarized waves, and point B is the extraction point for right-handed circularly polarized waves.6 Next, FIGS. 11 to 13 6(a) to (e) are used as the radiating conductor 5, and the radiating conductor 5 and the earth conductor 3 are connected to each other.
By arranging the feeding conductor 6 between them, the antenna surface and the feeding surface are formed separately, and it is a so-called triplate planar antenna. In the figure, 4'' and 4'' are dielectric layers.

However, in such conventional examples, when designing a planar array antenna, in order to improve the coupling between the feed system 2 and the radiating section 1, the dielectric layer 4 is made thinner by 1.7 mm. However, in order to reduce power supply system loss, it is necessary to increase the thickness of the FJ of the power layer 4, and there is a problem that it is not possible to satisfy both of these thickness relationships. Since the radiating section 1 and the feeding system 2 are not completely separated, there is a problem that operation in an unnecessary mode is likely to occur, and it is difficult to design the system so that it does not operate in an unnecessary mode. Equivalent power supply system loss is approximately 3dB
/m. In the figure, the X mark exemplifies the feeding point, and this feeding point takes into account whether the received radio waves are left-handed circularly polarized waves or right-handed circularly polarized waves. The settings are set appropriately with consideration to

FIG. 8 is an operational explanatory diagram showing the feeding point and current distribution of the radiation conductor 5, which is a rectangular batch conductor with one side of L.

[Objective of the Invention] The present invention has been made in view of the above points, and its purpose is to completely separate the radiating section and the power supply system so that each can be designed most efficiently. The object of the present invention is to provide a planar antenna with high overall efficiency.

[Disclosure of the Invention] (Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, in which a first earth conductor 3a and a radiation conductor 5 are connected to a first dielectric layer 4.
A pair of power feeding conductors 6a, 6 are formed to face each other via a to form the radiation part 1, and are paired with the second ground conductor 3b.
b represents the second and third dielectric layers 4b.

・The power supply system 2 is formed by facing each other via 1c, and the radiation part 1
A power supply system 2 is arranged on the back side of the radiating conductor 5 via a fourth dielectric layer 4d, and two types of power supply points A of the radiation conductor 5 are provided.

Connect the power supply point of the power supply conductor G g, 6 b to the conductor 7.
This is a 'ζ connection via aw7b. Further, in the embodiment, the dielectric layers 4a, 4b, 4c, and 4d are formed of air layers, and both ground conductors 3+1+3b and each conductor 5, 6a, 6bii! 1 is maintained at predetermined distances U, αb, Q, and c+Qd by a support rod 8, respectively. Masuko, the connection conductor 7a is connected to the ground conductor 3a.

71) is inserted into the through hole 9. Note that the dielectric layers 4a, 4b, 4c, and 4d may be formed of a thin dielectric substrate as in the conventional example. (1) Needless to say, by providing a third ground conductor between the power supply conductors 6a and 6b via a dielectric layer,
The isolation between the power supply conductors 6a and 6b may be made more reliable.

The operation of the embodiment will be described below. Now, the din G of the planar antenna is the gain of the radiating part 1, G, (clB)
, if the equivalent feed system loss is F (dB/ω) and the length of the microstrip line of the feed system 2 is L, then G=G, -FL (dB). Here, when the antenna reception efficiency of the radiator 1 is high (for example, about 80%), the din G of the planar antenna is
The equivalent power supply system loss F has a large effect on the power supply. By the way, in the embodiment, since the radiation g1 and the feeding system 2 are formed completely separately, each can be designed in the most efficient manner, and a planar antenna with high overall efficiency can be obtained. For example, if the radiating section 1 is fitted with an elbow designed to obtain sufficient reception efficiency,
; the equivalent feed system loss F is 0, 8 dB/'IQ
This means that the overall efficiency can be significantly improved compared to the conventional example.

In addition, since the pair of feed conductors 6a and 6b feeds power to two types of feed points on the radiation conductor 5, it is possible to switch the feed method and use a planar antenna that can receive each a-polarized wave. This can be easily achieved. For example, when power is supplied from the feeding point A of the radiation conductor 5, the polarization plane
When feeding from feed point B, it becomes a linearly polarized lunar plane antenna with polarization plane Y, and when feed points A and B are fed at the same time in the same phase or in opposite phase, the antenna It becomes a linearly polarized planar antenna with . On the other hand, by shifting the feeding phase of the feeding point A and the feeding phase of αB by ±90°, a planar antenna for right-handed circularly polarized waves or left-handed circularly polarized waves can be obtained.

FIG. 3 shows a linearly polarized antenna device formed by selectively connecting the BS converter 10 to the feed conductors 6g and 6b via the changeover switch 11. Polarized wave reception can be freely selected using a changeover switch 11.

Figure 4 shows each salary? Conductor 6a, 6b empty 43
By providing two signal extraction points and setting the distance η between both signal extraction points to λg/4, a circularly polarized antenna device is formed with a phase difference of 90 degrees between both feeds A and B. By setting the changeover switch 11 to the a side, right-handed circularly polarized waves are received, and by setting it to the b side, left-handed circularly polarized waves are received.

In FIG. 5, a tilted direct #la polarized antenna device is formed by setting the distance l between signal points to λg/2, and by switching the changeover switch 11. It is now possible to reverse the tilted plane of polarization.

Fig. 6 shows an example in which feeding points A and B of the radiation conductor 5 made of a rectangular patch element are set at the corners of both ends of one side, and when MF current is applied to both feeding points A and B in the same phase. In this case, a linearly polarized planar antenna with a polarization plane X is obtained, and when the power is fed in an opposite phase, a linearly polarized antenna with a polarization plane Y is obtained. On the other hand, when power is fed only to αA, a right-handed circularly polarized wave antenna is obtained, and when power is fed only to feeding point B, a left-handed circularly polarized wave antenna is obtained.

[Effects of the Invention j As described above, the present invention provides a first earth conductor and a radiation conductor! The 27th space conductor and the pair of power supply conductors are connected to the 27th space conductor and the 27th power supply conductor to face each other through the 51st dielectric layer.
, two types of power supply systems are formed by facing each other with a third dielectric layer interposed therebetween, and the above power supply system is arranged on the back side of the radiating section through a fourth "JJ" electric layer, and the radiating conductor is The feed point of each feed conductor is connected to two types of feed points via a connecting conductor, and the radiating part and the feed system are completely separated, so each can be used in the most efficient manner. The result is that a planar antenna that can be designed and has high overall efficiency can be created.
In addition, since a pair of power supply conductors can supply power to 243 power supply points on the radiation conductor, it is possible to receive various polarized waves at 3 points.
This has the effect of easily realizing a planar antenna.

・10 Drawing Simplification 41) Theory f 11/A Figure 1 shows the present invention - 1711 cross-section of the Tenfu example, Figure 2 shows the top view of the same, and Figures 3 to 6 show the example of the same moon. figure,
FIGS. 7 to 10 are diagrams showing the configuration and operation of the main parts of the conventional example, and FIGS. 11 to 13 are diagrams showing the construction and operation of the main parts of the conventional example of a hospital.

1 is a radiation part, 2 is a feeding system, 3 a, 3 b are ground conductors, 4 a, 4 b, 4 c, 4 d are dielectric layers, 5 is a radiation conductor, 6 a, bb are feeding conductors, 7 a ,
7 b is a connecting conductor.

Agent Patent Attorney Ishi 1) Ai Shichi 6D Figure 4 I-1 Figure 5 a Figure 6 door Figure 7 Figure 10 Two (c) (d) (e) Figure 12 Figure 13 Procedural amendment (voluntary) October 25, 1986

Claims (1)

[Claims] (1) A first ground conductor and a radiation conductor are opposed to each other via a first dielectric layer to form a radiation part, and a second earth conductor and a pair of power supply conductors are connected to a second and third dielectric layer. Two types of power supply systems are formed by facing each other with the body layer in between, and the above power supply system is arranged on the back side of the radiating section with a fourth dielectric layer interposed therebetween. A planar antenna characterized in that a feeding point of a feeding conductor is connected via a connecting conductor.